Merge pull request 'Add Facebook' (#17) from facebook-posts into main

Reviewed-on: #17
Reviewed-by: James Griffin-Allwood <[email protected]>

.gitea/workflows/publish.yml

@@ -157,19 +157,26 @@ jobs:
     # it is a candidate for, so there is nothing yet to move past.
     if: github.ref_type == 'tag' && !contains(github.ref_name, '-')
     runs-on: ubuntu-latest
+    # npm does the bump, so this one job wants node. A job in a container is
+    # given `sh -e {0}` as its shell rather than the bash the runner's own jobs
+    # get, and dash has neither `pipefail` nor the `10#` below — which failed
+    # the first line of the first step the one time this ran. node:22 is Debian
+    # and carries bash, so asking for it keeps these scripts the same as the
+    # ones in the job above.
     container:
       image: node:22
+    defaults:
+      run:
+        shell: bash
     steps:
       # The tag names a commit in main's history, but the bump belongs on the
-      # branch, so this checks out main rather than the tag.
+      # branch, so this checks out main rather than the tag. The full history
+      # because a shallow clone cannot reliably push a branch back.
       - uses: actions/checkout@v4
         with:
           ref: main
-          # The task token can push only if the instance allows Actions to
+          fetch-depth: 0
-          # write to the repository. Where it does not, set VERSION_BUMP_TOKEN
+          token: ${{ secrets.GITHUB_TOKEN }}
-          # to a personal access token with write access and it is used
-          # instead.
-          token: ${{ secrets.VERSION_BUMP_TOKEN || secrets.GITEA_TOKEN }}
 
       - name: Work out the next patch version
         id: next
@@ -211,30 +218,59 @@ jobs:
           echo "changed=true" >> "$GITHUB_OUTPUT"
           echo "package.json ${current} -> ${NEXT}"
 
-      - name: Commit it to main
+      # The bump arrives as a pull request rather than as a commit straight to
+      # main. Pushing a branch asks nothing of the task token beyond ordinary
+      # write access, so nothing here depends on being allowed past whatever
+      # protects main; and the pull request puts the changed package.json
+      # through the build before it lands. Since main is never pushed, the
+      # `[skip ci]` that would otherwise be needed to stop this rebuilding the
+      # image just published is not.
+      - name: Open a pull request for it
         if: steps.bump.outputs.changed == 'true'
         env:
           NEXT: ${{ steps.next.outputs.next }}
+          RELEASED: ${{ github.ref_name }}
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           set -euo pipefail
 
+          branch="release/bump-${NEXT}"
+
           # A name that is not a person, and a reserved address that can never
           # resolve to one. Nothing here names the instance it runs on.
           git config user.name 'Release bot'
           git config user.email '[email protected]'
 
+          git checkout -b "${branch}"
           git add package.json package-lock.json
-          # `[skip ci]` because this commit is a number and nothing else:
+          git commit -m "Set the working version to ${NEXT}"
-          # without it the push to main starts another build of the very image
+          git push origin "${branch}"
-          # that was just published.
-          git commit -m "Set the working version to ${NEXT} [skip ci]"
 
-          if ! git push origin HEAD:main; then
+          # node rather than jq to build the request body: jq is not in this
-            echo >&2
+          # image, and node is the one thing that certainly is.
-            echo "Could not push the version bump to main. Either the Actions" >&2
+          payload="$(BRANCH="${branch}" node -e 'process.stdout.write(JSON.stringify({
-            echo "token has no write access to this repository, or main is" >&2
+            head: process.env.BRANCH,
-            echo "protected against direct pushes. Set VERSION_BUMP_TOKEN to a" >&2
+            base: "main",
-            echo "token that may push to main, or allow that token past the" >&2
+            title: `Set the working version to ${process.env.NEXT}`,
-            echo "branch protection." >&2
+            body: `${process.env.RELEASED} has shipped, so the tree was left on a version that is published and immutable. This moves it on to ${process.env.NEXT}, which is deliberately not a version that exists.`,
+          }))')"
+
+          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+          response="$(mktemp)"
+          code="$(curl -sS -o "${response}" -w '%{http_code}' \
+            -X POST "${api}/pulls" \
+            -H "Authorization: token ${TOKEN}" \
+            -H 'Content-Type: application/json' \
+            -d "${payload}")"
+
+          case "${code}" in
+            201) echo "Opened ${branch} against main." ;;
+            # A release re-run that got this far: the branch and its pull
+            # request are already there, which is the state we wanted anyway.
+            409) echo "A pull request for ${branch} is already open." ;;
+            *)
+              echo "Could not open the pull request (HTTP ${code}):" >&2
+              cat "${response}" >&2
               exit 1
-          fi
+              ;;
+          esac

CLAUDE.md

@@ -1,7 +1,7 @@
 # antisocial — working notes
 
 A self-hosted page that shows a social post without the app. StopTheMadness rewrites
-links to X, Threads, Instagram, TikTok, Bluesky and Reddit into
+links to X, Threads, Instagram, Facebook, TikTok, Bluesky and Reddit into
 `/<prefix>/<original path>`; this resolves the post by driving a real headless Chromium
 and renders the media, the text, a platform badge and a copy-the-original button.
 
@@ -35,6 +35,7 @@ different fixes:
 | Right media, wrong count | The structured payload was missed and it fell through to the DOM, which only shows the first carousel item. |
 | Poster image where a video belongs | Same fall-through, plus the `<video>` had not hydrated when the DOM was read. |
 | Nothing at all | The platform refused this specific post logged out, or a key moved. |
+| Someone else's post entirely | Facebook. The linked post was not on the page, so the feed it ships alongside got read instead. Should be an error, not a post — check what `partsOfPost` matched. |
 | Reddit post fine, no comments | The `.json` was refused and it fell through to the page, where the comment tree loads late. |
 
 **3. Look at what the page actually served.**
@@ -89,6 +90,9 @@ Things worth knowing before editing:
 - **Extraction is layered**, most structured first: the platform's own API response
   caught in flight → an inline payload → the rendered DOM → OG tags. Keep that order
   when you touch an adapter; each layer is the fallback for the one above.
+- **`mediaFromOpenGraph` in `meta-media.ts`** is the floor shared by Instagram, Threads
+  and Facebook. The three are one product underneath; the first two also share the media
+  schema, Facebook has its own.
 - **`src/platforms/scan.ts`** pulls a balanced JSON object out of a page by key,
   including when it arrives escaped inside a JS string. Instagram needs this. If a
   payload looks present but parses to nothing, suspect an extra encoding level.
@@ -96,6 +100,15 @@ Things worth knowing before editing:
   `src/media/registry.ts` and served from `/m/<id>` with the `Referer`/`Cookie` the CDN
   demands. `Range` is forwarded — without it the native video scrubber cannot seek.
   The exception is HLS (`direct: true`), because proxying would mean rewriting playlists.
+- **A video is sized by its poster**, not by the ratio the renderer puts on it. A
+  `<video>` with no data has a natural size of 300x150, and WebKit sizes it from that —
+  so one with no poster of its own gets an empty SVG of the right shape as a stand-in,
+  without which a portrait video sits in a squat landscape box until you press play.
+- **A page with a video claims the `playback` audio session** (`public/app.js`). iOS
+  hands inline video the ambient session, which the Ring/Silent switch mutes, so
+  without this the video plays and says nothing until it goes fullscreen — and the
+  report that arrives is "this one platform has no sound". The session only activates
+  once something plays, so declaring it costs nothing on a page nobody presses play on.
 - **Never a bare error page.** A failed resolve renders a card carrying the platform, the
   original URL and the copy button. A broken adapter must still leave the link one tap
   away.
@@ -144,19 +157,54 @@ Things worth knowing before editing:
   Video: `fallback_url` is the *video track alone* whenever `has_audio` is true, so a
   post with sound has to use `hls_url`, direct and unproxied; a silent one gets the
   proxied MP4. `scrubber_media_url` is not a poster — it is a second MP4 for the
-  timeline thumbnails, and the still is in `preview.images`. A gallery's pictures are in
+  timeline thumbnails, and the still is in `preview.images` — which belongs to both
-  `media_metadata`, keyed and unordered; their order is only in `gallery_data`. Comment
+  forms: the HLS one used to go without, and showed an empty box where a silent post
+  showed a frame. A gallery's pictures are in `media_metadata`, keyed and unordered;
+  their order is only in `gallery_data`. Comment
   bodies are Markdown, rendered by `src/render/markdown.ts` — escape first, then put
   back the constructs we chose to support, never `body_html`. An image in a comment is
   written as a token rather than an address — `![gif](giphy|Ve7wX45)`,
-  `![img](emote|t5_2th52|4358)`, `![img](jo8gf0ca92zd1)` — and in every case the token is
+  `![img](emote|t5_2th52|4358)`, `![img](jo8gf0ca92zd1)` — and the token is usually a key
-  a key in that same comment's own `media_metadata`, so `resolveInlineImages` is one
+  in that same comment's own `media_metadata`, so `resolveInlineImages` is one lookup
-  lookup rather than three special cases. A bare `preview.redd.it` address pasted into a
+  rather than three special cases. Usually: plenty of comments carry a Giphy token and
-  comment is in there too, keyed by the id inside the URL. Prefer `s.gif` over `s.mp4`
+  no `media_metadata` at all, and Giphy is the one of the three whose id means something
-  for an animated one: a GIF moves in an `<img>` and an MP4 needs a player. An address
+  off Reddit, so that token alone falls back to `i.giphy.com/media/<id>/giphy.gif`. A
+  variant name after the id is dropped — Giphy does not serve every variant of every
+  gif. A bare `preview.redd.it` address pasted into a comment is in there too, keyed by
+  the id inside the URL. Prefer `s.gif` over `s.mp4` for an animated one: a GIF moves in
+  an `<img>` and an MP4 needs a player. An address
   typed without a scheme counts as well, but only when it ends in an image extension —
   the rule wants a host, a path *and* that extension, because comments are full of
   dotted, slashed prose that must not turn into links.
+- **Facebook** — the post page logged out carries everything: the caption, the author,
+  the files and the dimensions, in `ScheduledServerJS` payloads that are plain JSON in
+  ordinary `<script>` tags. What it does *not* carry is only that post. A reel ships the
+  next five reels of the feed under `viewer.lasso_blue_feed`, a video ships its related
+  videos, and each one has the same fields in the same shape as the real one — so
+  nothing may be read until the post has been picked out, which `partsOfPost` does by
+  matching the id in the address against every node that names one. An address with no
+  id in it (a `pfbid` permalink) is matched on `permalink_url`/`wwwURL` instead; only
+  then, with nothing to match on at all, does it fall back to the route's query results,
+  which is still narrower than the whole payload — the page ships its entire client
+  configuration too, thousands of nodes carrying a `name` or an `id`, and a plain search
+  finds a video player setting long before it finds the author. An id that matches
+  nothing is a *failure*: Facebook answers a link to something it no longer has by
+  quietly serving something else (`/watch/<id>` becomes the Watch home page, feed and
+  all), and reading that would put a stranger's video under the link that was shared.
+  One post's pieces are spread over several payload blocks — a video post keeps its
+  files in one, its caption in another and its author's avatar in a third — so every
+  claiming node is collected, not just the first. The author is whatever the payload
+  calls the *owner* (`actors`, `owner`, `video_owner`, `owner_as_page`); `author` on a
+  Facebook page means the author of a comment, which sits in the same shape with a name
+  and a picture, and taking the first node with a name on it finds a commenter as
+  readily as the poster. Media: `videoDeliveryLegacyFields.browser_native_hd_url` for a
+  video with `preferred_thumbnail` as its poster, `photo_image`/`image` for a picture,
+  and `all_subattachments.nodes` for a post of several — which is shipped empty on
+  single-picture posts, so only a populated one is a carousel. The CDN is signed and
+  serves `Range` without being asked for a referrer, but the assets are proxied like
+  everything else. `/share/{r,v,p,g}/<code>` links are stubs; the adapter follows one
+  and hands back where it landed, since the share code says nothing about what it opens.
+  `m.facebook.com` is a login wall logged out — always rebuild on `www.`.
 - **Threads** — same media schema as Instagram (`src/platforms/meta-media.ts`). Its
   payloads are full of empty stub nodes, so the finder only accepts a node with actual
   candidates in it. The page ships the linked post, the author's follow-ups, other
@@ -183,6 +231,10 @@ Login walls are not passed through — those need an account and cannot be solve
 - **No ESLint** — `typescript-eslint` does not support TS 7 yet. `npm run typecheck` is
   the lint step.
 - Tests are `node:test` against captured fixtures. No network in the test suite.
+- `public/` is served as-is to the browser, so what is in there is plain JS, not TS.
+  `public/browsers.js` — the per-browser URL schemes behind the "open in" picker — is
+  a module rather than more of `app.js` so a test can import it; that is what `allowJs`
+  in `tsconfig.json` is for.
 - Comments explain *why*, especially where the code looks odd because a platform is odd.
   Match that; do not add narration of what the next line does.
 - Post text comes from strangers: everything goes through the `html` tagged template or
@@ -210,16 +262,22 @@ The registry comes from the `REGISTRY` repository variable, the image name from
 `IMAGE_NAME` or the repository name, and credentials from `REGISTRY_USER` and the
 `REGISTRY_TOKEN` secret. Nothing about any particular deployment is committed here.
 
-A release also moves `package.json` on to the next patch version, committed to main by
+A release also moves `package.json` on to the next patch version, opened as a pull
-the `bump` job — so the number in the tree is never one that has already shipped and
+request by the `bump` job — so the number in the tree is never one that has already
-been made immutable. It lives in `publish.yml` rather than a workflow of its own so it
+shipped and been made immutable. It lives in `publish.yml` rather than a workflow of its
-can say `needs: build`: a version that failed to publish has not been released, and
+own so it can say `needs: build`: a version that failed to publish has not been
-bumping past it would claim otherwise. Prereleases are skipped, being candidates for a
+released, and bumping past it would claim otherwise. Prereleases are skipped, being
-version that has not shipped. The bump goes through `npm version` rather than an edit in
+candidates for a version that has not shipped. The bump goes through `npm version`
-place, because the version is in the lockfile too, in more than one place, and the two
+rather than an edit in place, because the version is in the lockfile too, in more than
-have to agree. The commit carries `[skip ci]`, or pushing it would rebuild the image
+one place, and the two have to agree.
-that was just published. Pushing to main needs a token with write access —
+
-`VERSION_BUMP_TOKEN` overrides the task token where that one cannot.
+It arrives as a pull request rather than as a commit straight to main: pushing a branch
+asks nothing of the task token beyond ordinary write access, so it does not matter what
+protects main, and the changed `package.json` goes through a build before it lands.
+Nothing pushes to main, so no `[skip ci]` is needed to stop the bump rebuilding the
+image just published. The job is the only one that runs in a container (`node:22`, for
+npm), and a job in a container is handed `sh`, not bash — hence the explicit
+`shell: bash`, without which `set -o pipefail` fails the first line of the first step.
 
 Two things any deployment has to get right, both learned the hard way:
 

README.md

@@ -2,11 +2,12 @@
 
 Reads social posts back to you without the app.
 
-Links to X, Threads, Instagram, TikTok, Bluesky and Reddit get shared constantly, and
+Links to X, Threads, Instagram, Facebook, TikTok, Bluesky and Reddit get shared
-opening one means an app interstitial, a login wall, a feed you didn't ask for, and a
+constantly, and opening one means an app interstitial, a login wall, a feed you didn't
-pile of tracking. antisocial is the other half of a StopTheMadness rewrite rule: the link gets
+ask for, and a pile of tracking. antisocial is the other half of a StopTheMadness rewrite
-redirected here, and you get the post — the media and the words — plus a badge saying
+rule: the link gets redirected here, and you get the post — the media and the words —
-where it came from and a button to copy the original URL if you do want to go there.
+plus a badge saying where it came from and a button to copy the original URL if you do
+want to go there.
 
 Built for one person, on a private network. There is **no authentication of any kind** —
 anything that can reach it can drive a browser through it, so put it somewhere only you
@@ -37,6 +38,10 @@ https://antisocial.example.com/threads/$1
 /^https:\/\/(?:www\.)?instagram\.com\/(.*)$/
 https://antisocial.example.com/ig/$1
 
+# Facebook
+/^https:\/\/(?:www\.|m\.|web\.)?facebook\.com\/(.*)$/
+https://antisocial.example.com/fb/$1
+
 # TikTok
 /^https:\/\/(?:www\.|vm\.|vt\.)?tiktok\.com\/(.*)$/
 https://antisocial.example.com/tiktok/$1
@@ -68,11 +73,42 @@ share codes lose their subdomain in the rewrite; a single opaque path segment is
 recognised as a share code and rebuilt as `vm.tiktok.com/<code>/`, or `redd.it/<code>`
 where it came from Reddit. A Reddit `/r/<sub>/s/<code>` share link is followed to the
 post it points at, and that permalink — not the opaque share code — is what the copy
-button hands back.
+button hands back. A Facebook `/share/r/<code>` link is followed the same way, and
+`m.facebook.com` is rebuilt on `www.` because the mobile site answers a logged-out
+reader with a login page and nothing else.
 
 `/` serves these rules with the live hostname already filled in, if you'd rather copy
 them from there.
 
+## Opening the original
+
+The rules are indiscriminate, which is the point — but that catches the way back out
+too. Tapping "Open on Instagram" in the browser the rules are installed in redirects
+straight back here, so the one button meant to get you to the app is the one button that
+cannot.
+
+The way past it is to hand the address to a *different* browser, by its own URL scheme.
+`/` has a picker for which one:
+
+| Browser | macOS | iOS |
+| --- | --- | --- |
+| Chrome | `googlechromes://…` | `googlechromes://…` |
+| Edge | `microsoft-edge:https://…` | `microsoft-edge-https://…` |
+| Orion | `orion://open-url?url=…` | `orion://open-url?url=…` |
+| Firefox | — | `firefox://open-url?url=…` |
+
+Firefox on macOS registers no scheme, so it is not offered there; nor is Safari itself,
+which is the browser being escaped. The choice is kept in that browser's own
+`localStorage` — not a cookie and not synced, because "which browser is installed" is a
+fact about the device, not about you, and the phone's answer is not the Mac's.
+
+Until a browser is chosen there is no "Open on …" button at all — the plain address is
+the one thing it must not offer, since following it only comes back here. The markup
+carries that address anyway, hidden, and the script swaps in the scheme and reveals the
+button once there is somewhere to send it. So with JavaScript off, or with the default
+left alone, the copy button and the selectable URL are the whole of it, which is all
+that was ever load-bearing.
+
 ## How it works
 
 Every request drives a real Chromium page load. One code path, and it survives markup
@@ -93,6 +129,7 @@ Each adapter layers its extraction, most structured first:
 | Bluesky   | the public AT Protocol API   | `getPostThread`; falls back to the post page                    |
 | X         | `platform.twitter.com` embed | the `cdn.syndication.twimg.com/tweet-result` response           |
 | Instagram | `/embed/captioned/`          | `shortcode_media`, then the rendered `<video>`/`<img>`          |
+| Facebook  | the post page                | the Relay payloads, narrowed to the nodes naming that post      |
 | TikTok    | the post page                | `__UNIVERSAL_DATA_FOR_REHYDRATION__`                            |
 | Threads   | the post page                | the Relay payloads in `<script type="application/json">`        |
 | Reddit    | the post's own `.json`       | the post and the first page of comments; falls back to the page |
@@ -142,6 +179,10 @@ The one exception is Bluesky video, which is an HLS playlist — proxying it wou
 rewriting the manifest and every segment, so it is linked directly. Safari plays HLS
 natively; other browsers show a note.
 
+A page carrying a video asks iOS for the playback audio session. Without it a video
+playing inline is treated as ambience and the Ring/Silent switch mutes it, so the post
+plays perfectly and says nothing unless you go fullscreen.
+
 Resolved posts are cached in memory for an hour, so a reload or a back button doesn't
 drive the browser again.
 
@@ -173,6 +214,11 @@ Known rough edges:
 - **Instagram is the least reliable.** It only ships the structured payload some of the
   time. When it doesn't, the rendered DOM carries single images and reels fine, but a
   carousel will come back as its first image only.
+- **Facebook ships the post surrounded by other people's posts.** A reel arrives with
+  the next five reels of the feed attached, in exactly the same shape. Only the nodes
+  naming the post in the address are read, so a link to something Facebook no longer has
+  — which it answers by quietly serving the Watch home page — fails rather than showing
+  a stranger's video under your link.
 - **TikTok sometimes answers with a slider puzzle** instead of the post. You get handed
   the puzzle rather than an error — see below.
 - **Reddit refuses `.json` to a browser it has never seen.** The first request of a cold

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "antisocial",
-  "version": "1.2.1",
+  "version": "1.2.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "antisocial",
-      "version": "1.2.1",
+      "version": "1.2.5",
       "license": "UNLICENSED",
       "dependencies": {
         "@fastify/static": "10.1.3",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "antisocial",
-  "version": "1.2.1",
+  "version": "1.2.5",
   "private": true,
   "description": "Reads social posts back to you without the app.",
   "license": "UNLICENSED",

public/app.css

@@ -242,6 +242,30 @@ main { max-width: 680px; margin: 0 auto; }
 .index__table td { padding: 8px 8px 8px 0; border-top: 1px solid var(--line); vertical-align: middle; }
 .index__table code { overflow-wrap: anywhere; }
 
+.picker {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 8px 10px;
+  margin-top: 18px;
+  padding-top: 14px;
+  border-top: 1px solid var(--line);
+}
+/* The control ships hidden and is revealed by the script, and `display:
+   flex` above would otherwise beat the browser's own rule for [hidden]. */
+.picker[hidden] { display: none; }
+.picker__label { font-size: 13px; color: var(--ink-dim); }
+.picker__select {
+  font: inherit;
+  font-size: 14px;
+  padding: 7px 10px;
+  border-radius: 999px;
+  border: 1px solid var(--line);
+  background: var(--card);
+  color: var(--ink);
+}
+.picker__note { flex-basis: 100%; margin: 0; font-size: 12px; color: var(--ink-dim); }
+
 /* ---------- verification puzzle ---------- */
 
 .challenge__lede { margin: 14px; font-size: 14px; color: var(--ink-dim); }

public/app.js

@@ -1,7 +1,10 @@
 // Progressive enhancement only. Without this file the page still shows the
 // media in a swipeable rail and the original URL as selectable text.
 
+import { browsersFor, detectOs, openUrlFor } from './browsers.js';
+
 const VIEW_KEY = 'antisocial:view';
+const BROWSER_KEY = 'antisocial:browser';
 
 function setupCopy() {
   for (const button of document.querySelectorAll('.copy')) {
@@ -37,6 +40,62 @@ function setupCopy() {
   }
 }
 
+function storedBrowser() {
+  try {
+    return localStorage.getItem(BROWSER_KEY) ?? 'default';
+  } catch {
+    return 'default';
+  }
+}
+
+// The markup carries the plain address, which is the one thing the button
+// must not offer: followed in the browser the rewrite rules are installed
+// in, it redirects straight back to this page. So the link ships hidden and
+// is only revealed once a browser has been picked to hand it to. With no
+// choice made -- or none this system has a scheme for -- the copy button
+// and the URL below it are the whole of it.
+function applyBrowser(id) {
+  const os = detectOs();
+
+  for (const link of document.querySelectorAll('.original__open')) {
+    link.dataset.original ??= link.getAttribute('href');
+
+    const href = openUrlFor(link.dataset.original, id, os);
+    link.href = href;
+    link.hidden = href === link.dataset.original;
+  }
+}
+
+// Only on the index page, and only with this file running: the choice is
+// useless without the rewriting above, so the control ships hidden.
+function setupBrowserPicker() {
+  const select = document.querySelector('.picker__select');
+  if (!select) return;
+
+  for (const browser of browsersFor(detectOs())) {
+    const option = document.createElement('option');
+    option.value = browser.id;
+    option.textContent = browser.label;
+    select.append(option);
+  }
+
+  // A stored id with no scheme on this system would leave the control
+  // showing nothing at all, so fall back rather than render a blank.
+  const stored = storedBrowser();
+  select.value = [...select.options].some((option) => option.value === stored) ? stored : 'default';
+
+  select.addEventListener('change', () => {
+    try {
+      localStorage.setItem(BROWSER_KEY, select.value);
+    } catch {
+      // Private browsing. The choice just won't survive the page.
+    }
+    applyBrowser(select.value);
+  });
+
+  select.closest('.picker').hidden = false;
+}
+
 // One per rail: a post can carry several -- a thread of them, or a post and
 // the post it quotes -- and wiring only the first leaves the rest inert.
 function setupMedia(media) {
@@ -96,6 +155,19 @@ function setupMedia(media) {
   }
 }
 
+// On iOS a video playing inline gets the "ambient" audio session, which the
+// Ring/Silent switch mutes -- so the post plays perfectly and says nothing,
+// and the only way to hear it is to go fullscreen. Claiming "playback" says
+// what is true here: the sound is the point, not decoration. The session is
+// not activated until something actually plays, so declaring it up front
+// interrupts nothing; it is declared only on a page that has a video so an
+// ordinary text post never claims it at all.
+function setupAudioSession() {
+  if (!('audioSession' in navigator)) return;
+  if (!document.querySelector('video')) return;
+  navigator.audioSession.type = 'playback';
+}
+
 // Every comment is a <details open>, so folding one already works with this
 // file missing. All this adds is doing the whole page at once, which is why
 // the button ships hidden and is only revealed here.
@@ -127,7 +199,10 @@ function setupComments() {
 }
 
 setupCopy();
+applyBrowser(storedBrowser());
+setupBrowserPicker();
 for (const media of document.querySelectorAll('.media')) setupMedia(media);
+setupAudioSession();
 setupComments();
 
 // --- Verification puzzles -------------------------------------------------

public/browsers.js

@@ -0,0 +1,64 @@
+// The rewrite rules that send a shared link here catch the original link on
+// the way back out too, so in Safari "Open on <platform>" lands back on this
+// page. Handing the address to a different browser is the way out, and the
+// only way to do that from a web page is that browser's own URL scheme --
+// which every one of them spells differently. Some swap the scheme, some
+// prefix it, some take the whole address as a query parameter.
+
+/** http -> googlechrome://, https -> googlechromes:// */
+const chrome = (url) => url.replace(/^http(s?):/, 'googlechrome$1:');
+
+// Edge keeps the original scheme either way, but on macOS it stays in the
+// address and the scheme is prefixed, while on iOS it is folded into the
+// scheme itself.
+const edgeMacos = (url) => `microsoft-edge:${url}`;
+const edgeIos = (url) => url.replace(/^http(s?):/, 'microsoft-edge-http$1:');
+
+/** Firefox and Orion take the address as a parameter instead. */
+const openUrl = (scheme) => (url) => `${scheme}://open-url?url=${encodeURIComponent(url)}`;
+
+// `null` means the browser is there but ships no scheme to reach it on that
+// system, so there is nothing to offer beyond the plain link.
+export const BROWSERS = [
+  { id: 'default', label: 'Default browser', macos: null, ios: null },
+  { id: 'chrome', label: 'Chrome', macos: chrome, ios: chrome },
+  { id: 'edge', label: 'Edge', macos: edgeMacos, ios: edgeIos },
+  { id: 'firefox', label: 'Firefox', macos: null, ios: openUrl('firefox') },
+  { id: 'orion', label: 'Orion', macos: openUrl('orion'), ios: openUrl('orion') },
+];
+
+/**
+ * iPadOS calls itself MacIntel, so the platform string alone cannot tell the
+ * two apart; the touch points can. Everything else gets the desktop table --
+ * the only desktop this is ever opened on is a Mac.
+ *
+ * @param {{ platform?: string, maxTouchPoints?: number }} [nav]
+ */
+export function detectOs(nav = globalThis.navigator) {
+  const platform = nav?.platform ?? '';
+  if (/^iP(hone|ad|od)/.test(platform)) return 'ios';
+  if (platform === 'MacIntel' && (nav?.maxTouchPoints ?? 0) > 1) return 'ios';
+  return 'macos';
+}
+
+/** The browsers worth offering here: the default, plus the ones this system
+ *  actually has a scheme for. */
+export function browsersFor(os) {
+  return BROWSERS.filter((browser) => browser.id === 'default' || browser[os]);
+}
+
+function browserById(id) {
+  return BROWSERS.find((browser) => browser.id === id);
+}
+
+/**
+ * The address to open. A browser with no scheme on this system, an unknown
+ * id, or anything that is not an ordinary web link is handed back untouched:
+ * a dead custom scheme opens nothing at all, which is worse than the plain
+ * link opening in the wrong browser.
+ */
+export function openUrlFor(url, browserId, os) {
+  const rewrite = browserById(browserId)?.[os];
+  if (!rewrite || !/^https?:\/\//i.test(url)) return url;
+  return rewrite(url);
+}

src/platforms/facebook.ts

@@ -0,0 +1,451 @@
+import { ResolveError, oneSegment, type Author, type Media, type Post } from '../types.ts';
+import { readOpenGraph } from '../browser/capture.ts';
+import { mediaFromOpenGraph, metaHeaders } from './meta-media.ts';
+import { hostMatcher, stripTracking } from './url.ts';
+import type { PlatformSpec, ResolveContext } from './types.ts';
+
+const REFERER = 'https://www.facebook.com/';
+
+type FbImage = { uri?: string; width?: number; height?: number };
+
+/**
+ * One picture or one video, in the several shapes Facebook writes them in:
+ * a photo permalink makes the photo the node itself, a story hangs it off an
+ * attachment, and a video keeps its files in a sub-object of their own.
+ */
+type FbMediaNode = {
+  image?: FbImage;
+  photo_image?: FbImage;
+  viewer_image?: FbImage;
+  accessibility_caption?: string;
+  width?: number;
+  height?: number;
+  length_in_second?: number;
+  preferred_thumbnail?: { image?: FbImage };
+  thumbnailImage?: FbImage;
+  videoDeliveryLegacyFields?: {
+    browser_native_hd_url?: string;
+    browser_native_sd_url?: string;
+  };
+};
+
+type FbAttachment = {
+  media?: FbMediaNode;
+  styles?: { attachment?: { media?: FbMediaNode } };
+  all_subattachments?: { nodes?: FbAttachment[] };
+};
+
+type FbActor = {
+  id?: string;
+  name?: string;
+  url?: string;
+  profile_picture?: FbImage;
+  displayPicture?: FbImage;
+};
+
+export type Scraped = {
+  media: Media[];
+  text?: string;
+  author?: FbActor;
+  postedAt?: string;
+};
+
+/**
+ * Every node in `roots`, breadth-first.
+ *
+ * Order is the whole point: within one post the node nearest the top of the
+ * payload is the post itself, and the ones below it are the neighbouring
+ * album photo, the comment, the recommendation.
+ */
+function* nodes(roots: readonly unknown[]): Generator<Record<string, unknown>> {
+  const seen = new Set<unknown>();
+  const queue: unknown[] = [...roots];
+
+  for (let i = 0; i < queue.length; i += 1) {
+    const value = queue[i];
+    if (value === null || typeof value !== 'object' || seen.has(value)) continue;
+    seen.add(value);
+
+    if (Array.isArray(value)) {
+      queue.push(...value);
+      continue;
+    }
+
+    yield value as Record<string, unknown>;
+    queue.push(...Object.values(value));
+  }
+}
+
+/** Two Facebook addresses pointing at the same thing. */
+function samePath(a: string, b: string): boolean {
+  try {
+    const path = (raw: string): string =>
+      new URL(raw).pathname.replace(/\/+$/, '').toLowerCase();
+    return path(a) === path(b) && path(a) !== '';
+  } catch {
+    return false;
+  }
+}
+
+/** Whether this node says, one way or another, that it is the linked post. */
+function claimsPost(node: Record<string, unknown>, id: string | undefined, url: string): boolean {
+  if (id !== undefined) {
+    for (const key of ['id', 'post_id', 'video_id', 'legacy_story_hideable_id']) {
+      if (node[key] === id) return true;
+    }
+  }
+  for (const key of ['permalink_url', 'wwwURL', 'shareable_url', 'url']) {
+    const value = node[key];
+    if (typeof value === 'string' && samePath(value, url)) return true;
+  }
+  return false;
+}
+
+/**
+ * The route's own query results.
+ *
+ * Used when nothing in the payload names the post. Not the whole payload:
+ * alongside the post a Facebook page ships its entire client configuration,
+ * which is thousands of nodes deep and full of objects carrying a `name` or
+ * an `id`, and searching that finds a video player setting before it finds
+ * the author.
+ */
+function queryResults(payloads: readonly unknown[]): unknown[] {
+  const found: unknown[] = [];
+  for (const node of nodes(payloads)) {
+    const result = node['result'];
+    if (result !== null && typeof result === 'object' && 'data' in result) {
+      found.push((result as { data: unknown }).data);
+    }
+  }
+  return found;
+}
+
+/**
+ * The parts of the payload that belong to the post that was linked.
+ *
+ * A Facebook page is never only the post it was asked for: a reel arrives
+ * with the next five reels of the feed attached, a video with its related
+ * videos, and every one of them carries the same fields in the same shape as
+ * the real one. What separates them is the id, which is in the address and
+ * repeated on every node of the post it belongs to.
+ *
+ * One post's pieces are spread over several of these blocks — a video post
+ * keeps its files in one and its caption in another — so this collects every
+ * node that claims the post rather than stopping at the first.
+ *
+ * Empty means the page is not the post. Where the address named an id and
+ * nothing on the page answers to it, Facebook has quietly served something
+ * else: a `/watch/<id>` whose video is gone comes back as the Watch home
+ * page, feed and all, and reading that would put a stranger's video under
+ * the link that was shared. Only an address with no id in it — a `pfbid`
+ * permalink — falls back to the query results.
+ */
+export function partsOfPost(
+  payloads: readonly unknown[],
+  id: string | undefined,
+  url: string,
+): unknown[] {
+  const owned: unknown[] = [];
+  for (const node of nodes(payloads)) {
+    if (claimsPost(node, id, url)) owned.push(node);
+  }
+  if (owned.length > 0) return owned;
+  return id === undefined ? queryResults(payloads) : [];
+}
+
+export function mediaFromNode(node: FbMediaNode): Media[] {
+  const fetchHeaders = metaHeaders(REFERER);
+
+  const legacy = node.videoDeliveryLegacyFields;
+  const video = legacy?.browser_native_hd_url ?? legacy?.browser_native_sd_url;
+  if (video) {
+    const poster = node.preferred_thumbnail?.image?.uri ?? node.thumbnailImage?.uri;
+    return [{
+      kind: 'video',
+      url: video,
+      fetchHeaders,
+      ...(poster ? { poster: { url: poster, fetchHeaders } } : {}),
+      ...(node.length_in_second ? { durationSec: Math.round(node.length_in_second) } : {}),
+      ...(node.width ? { width: node.width } : {}),
+      ...(node.height ? { height: node.height } : {}),
+    }];
+  }
+
+  const image = node.photo_image ?? node.image ?? node.viewer_image;
+  if (!image?.uri) return [];
+  return [{
+    kind: 'image',
+    url: image.uri,
+    fetchHeaders,
+    ...(node.accessibility_caption ? { alt: node.accessibility_caption } : {}),
+    ...(image.width ? { width: image.width } : {}),
+    ...(image.height ? { height: image.height } : {}),
+  }];
+}
+
+/**
+ * Everything hanging off a story.
+ *
+ * `all_subattachments` is what makes a post of several pictures several
+ * pictures — but it is shipped on single-picture posts too, as an empty
+ * list, so only a populated one is a carousel.
+ */
+export function mediaFromAttachments(attachments: readonly FbAttachment[]): Media[] {
+  return attachments.flatMap((attachment) => {
+    const children = attachment.all_subattachments?.nodes;
+    if (children?.length) return mediaFromAttachments(children);
+    const node = attachment.styles?.attachment?.media ?? attachment.media;
+    return node ? mediaFromNode(node) : [];
+  });
+}
+
+function findMedia(owned: readonly unknown[]): Media[] {
+  // Attachments first: they are the only shape that can hold more than one
+  // picture, and a post with several would otherwise come back as its first.
+  for (const node of nodes(owned)) {
+    const attachments = node['attachments'];
+    if (!Array.isArray(attachments) || attachments.length === 0) continue;
+    const media = mediaFromAttachments(attachments as FbAttachment[]);
+    if (media.length > 0) return media;
+  }
+
+  // A photo permalink has no story around it; the node is the picture.
+  for (const node of nodes(owned)) {
+    const media = mediaFromNode(node as FbMediaNode);
+    if (media.length > 0) return media;
+  }
+
+  return [];
+}
+
+function findText(owned: readonly unknown[]): string | undefined {
+  for (const node of nodes(owned)) {
+    const message = node['message'];
+    if (message === null || typeof message !== 'object') continue;
+    const text = (message as Record<string, unknown>)['text'];
+    if (typeof text === 'string' && text.length > 0) return text;
+  }
+  return undefined;
+}
+
+function findPostedAt(owned: readonly unknown[]): string | undefined {
+  for (const node of nodes(owned)) {
+    for (const key of ['creation_time', 'created_time']) {
+      const seconds = node[key];
+      if (typeof seconds === 'number' && seconds > 0) {
+        return new Date(seconds * 1000).toISOString();
+      }
+    }
+  }
+  return undefined;
+}
+
+function isActor(value: unknown): value is FbActor {
+  if (value === null || typeof value !== 'object') return false;
+  const record = value as Record<string, unknown>;
+  return typeof record['name'] === 'string' && record['name'].length > 0;
+}
+
+/**
+ * Who posted it.
+ *
+ * Facebook calls the author of a post its owner, and keeps `author` for the
+ * author of a *comment* — which sits on the same page, in the same shape,
+ * with a name and a picture just like the poster's. Taking the first node
+ * carrying a name finds a commenter as readily as the person being read, so
+ * only the keys that mean "owner" count.
+ *
+ * The name, the vanity address and the picture are rarely all on one node,
+ * so the gaps are filled from the other nodes describing the same person —
+ * matched on id, never on position, so a commenter's picture can never end
+ * up under the poster's name.
+ */
+export function findAuthor(owned: readonly unknown[]): FbActor | undefined {
+  const owners: FbActor[] = [];
+  for (const node of nodes(owned)) {
+    for (const key of ['actors', 'owner', 'video_owner', 'owner_as_page']) {
+      const value = node[key];
+      const actor = Array.isArray(value) ? value[0] : value;
+      if (isActor(actor)) owners.push(actor);
+    }
+  }
+
+  const first = owners[0];
+  if (!first) return undefined;
+
+  // An owner with no id of its own is only itself: filling its gaps from
+  // every other id-less node would be matching on nothing at all.
+  const same = first.id === undefined ? [first] : owners.filter((actor) => actor.id === first.id);
+  const picture = same.find((actor) => actor.profile_picture?.uri ?? actor.displayPicture?.uri);
+  return {
+    ...first,
+    ...(first.url ? {} : { url: same.find((actor) => actor.url)?.url }),
+    ...(picture ? { profile_picture: picture.profile_picture ?? picture.displayPicture } : {}),
+  };
+}
+
+/** Everything the payload has to say about the post that was linked. */
+export function scrapeParts(owned: readonly unknown[]): Scraped {
+  const author = findAuthor(owned);
+  const text = findText(owned);
+  const postedAt = findPostedAt(owned);
+  return {
+    media: findMedia(owned),
+    ...(text ? { text } : {}),
+    ...(author ? { author } : {}),
+    ...(postedAt ? { postedAt } : {}),
+  };
+}
+
+/**
+ * The numeric id Facebook keys the post by, wherever this address keeps it.
+ *
+ * `/photo/?fbid=`, `/watch/?v=` and `permalink.php?story_fbid=` put it in the
+ * query; everything else ends on it. `id` is deliberately not read: on
+ * `permalink.php` it is the page's, not the post's.
+ */
+export function postIdFrom(url: URL): string | undefined {
+  for (const key of ['fbid', 'v', 'story_fbid']) {
+    const value = url.searchParams.get(key);
+    if (value && /^\d{6,}$/.test(value)) return value;
+  }
+  const segments = url.pathname.split('/').filter(Boolean);
+  return segments.reverse().find((segment) => /^\d{6,}$/.test(segment));
+}
+
+/** A profile address is one segment and nothing else. */
+function vanityFrom(url: string | undefined): string | undefined {
+  if (!url) return undefined;
+  try {
+    const match = /^\/([A-Za-z0-9.]+)\/?$/.exec(new URL(url).pathname);
+    const name = match?.[1];
+    return name && !name.endsWith('.php') ? name : undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+/** Shared page links lead with the page: `/nasa/posts/…`, `/nasa/videos/…`. */
+function vanityFromPath(pathRest: string): string | undefined {
+  return /^([A-Za-z0-9.]+)\/(?:posts|videos|photos)\//.exec(pathRest)?.[1];
+}
+
+function authorFrom(actor: FbActor | undefined, pathRest: string): Author {
+  const vanity = vanityFrom(actor?.url) ?? vanityFromPath(pathRest);
+  const avatar = actor?.profile_picture?.uri ?? actor?.displayPicture?.uri;
+
+  // Facebook has no universal @handle: a page has a vanity address, and a
+  // person may have nothing but a numeric id. Where there is no vanity the
+  // name is the only thing to call them by — an invented handle would be a
+  // name nobody could look up.
+  return {
+    handle: vanity ? `@${vanity}` : (actor?.name ?? 'Facebook'),
+    ...(actor?.name && vanity ? { displayName: actor.name } : {}),
+    ...(avatar ? { avatar: { url: avatar, fetchHeaders: metaHeaders(REFERER) } } : {}),
+  };
+}
+
+/** The payloads the page ships, which are plain JSON in ordinary `<script>`
+ *  tags rather than the `type="application/json"` Threads uses. */
+async function inlinePayloads(ctx: ResolveContext): Promise<unknown[]> {
+  const texts = await ctx.page
+    .evaluate(() =>
+      [...document.querySelectorAll('script')]
+        .map((el) => el.textContent ?? '')
+        .filter((text) => text.startsWith('{') && text.length > 256),
+    )
+    .catch(() => [] as string[]);
+
+  return texts.flatMap((text) => {
+    try {
+      return [JSON.parse(text) as unknown];
+    } catch {
+      return [];
+    }
+  });
+}
+
+/** Absolute floor: whatever the page offers a link preview. */
+async function fromOpenGraph(ctx: ResolveContext): Promise<Scraped> {
+  const og = await readOpenGraph(ctx.page);
+  return {
+    media: mediaFromOpenGraph(og, REFERER),
+    ...(og['og:description'] ? { text: og['og:description'] } : {}),
+  };
+}
+
+async function resolve(ctx: ResolveContext): Promise<Post> {
+  const { page, pathRest } = ctx;
+  let originalUrl = ctx.originalUrl;
+
+  await page.goto(originalUrl, { waitUntil: 'domcontentloaded' });
+
+  // `/share/…` links are opaque stubs, and what they point at is only on the
+  // other side of the redirect. Hand back where it landed rather than the
+  // share code, which says nothing about what it opens.
+  if (/^share\//.test(pathRest)) {
+    try {
+      originalUrl = stripTracking(new URL(page.url())).href;
+    } catch {
+      // Whatever it landed on is not a URL we can take apart; keep the one
+      // we were given.
+    }
+  }
+
+  const owned = partsOfPost(
+    await inlinePayloads(ctx),
+    postIdFrom(new URL(originalUrl)),
+    originalUrl,
+  );
+  if (owned.length === 0) {
+    throw new ResolveError(
+      'Facebook served something else for that link — the post may be gone',
+      'facebook',
+      originalUrl,
+    );
+  }
+
+  const scraped = scrapeParts(owned);
+
+  if (scraped.media.length === 0 && !scraped.text) {
+    const og = await fromOpenGraph(ctx);
+    if (og.media.length > 0 || og.text) {
+      return toPost({ ...og, ...(scraped.author ? { author: scraped.author } : {}) }, originalUrl, pathRest);
+    }
+    throw new ResolveError(
+      'Facebook would not show that post logged out',
+      'facebook',
+      originalUrl,
+    );
+  }
+
+  return toPost(scraped, originalUrl, pathRest);
+}
+
+function toPost(scraped: Scraped, originalUrl: string, pathRest: string): Post {
+  return {
+    platform: 'facebook',
+    platformLabel: 'Facebook',
+    originalUrl,
+    author: authorFrom(scraped.author, pathRest),
+    textPosition: 'above',
+    segments: oneSegment({
+      ...(scraped.text ? { text: scraped.text } : {}),
+      media: scraped.media,
+      ...(scraped.postedAt ? { postedAt: scraped.postedAt } : {}),
+    }),
+  };
+}
+
+export const facebook: PlatformSpec = {
+  id: 'facebook',
+  label: 'Facebook',
+  prefix: 'fb',
+  canonicalHost: 'www.facebook.com',
+  textPosition: 'above',
+  // `m.` and `web.` are the same site behind a login wall, so a link to one
+  // is rebuilt on `www.` rather than followed where it points.
+  matchesHost: hostMatcher('facebook.com', 'fb.com', 'fb.watch'),
+  resolve,
+};

src/platforms/index.ts

@@ -6,8 +6,11 @@ import { instagram } from './instagram.ts';
 import { tiktok } from './tiktok.ts';
 import { bluesky } from './bluesky.ts';
 import { reddit } from './reddit.ts';
+import { facebook } from './facebook.ts';
 
-export const platforms: readonly PlatformSpec[] = [x, threads, instagram, tiktok, bluesky, reddit];
+export const platforms: readonly PlatformSpec[] = [
+  x, threads, instagram, facebook, tiktok, bluesky, reddit,
+];
 
 const byPrefix = new Map(platforms.map((p) => [p.prefix, p]));
 

src/platforms/instagram.ts

@@ -1,6 +1,12 @@
 import { ResolveError, oneSegment, type Media, type Post } from '../types.ts';
 import { readOpenGraph } from '../browser/capture.ts';
-import { findCaption, findMetaMedia, mediaFromMetaNode, metaHeaders } from './meta-media.ts';
+import {
+  findCaption,
+  findMetaMedia,
+  mediaFromMetaNode,
+  mediaFromOpenGraph,
+  metaHeaders,
+} from './meta-media.ts';
 import { extractJsonObjectAfterKey } from './scan.ts';
 import { hostMatcher } from './url.ts';
 import type { PlatformSpec, ResolveContext } from './types.ts';
@@ -202,22 +208,8 @@ function fromPayloads(texts: string[]): Scraped | undefined {
 /** Absolute floor: whatever the page offers a link preview. */
 async function fromOpenGraph(ctx: ResolveContext): Promise<Scraped> {
   const og = await readOpenGraph(ctx.page);
-  const fetchHeaders = metaHeaders(REFERER);
-  const media: Media[] = [];
-
-  if (og['og:video']) {
-    media.push({
-      kind: 'video',
-      url: og['og:video'],
-      fetchHeaders,
-      ...(og['og:image'] ? { poster: { url: og['og:image'], fetchHeaders } } : {}),
-    });
-  } else if (og['og:image']) {
-    media.push({ kind: 'image', url: og['og:image'], fetchHeaders });
-  }
-
   return {
-    media,
+    media: mediaFromOpenGraph(og, REFERER),
     ...(og['og:description'] ? { text: og['og:description'] } : {}),
   };
 }

src/platforms/meta-media.ts

@@ -1,8 +1,10 @@
 import type { Media } from '../types.ts';
 
 /**
- * Instagram and Threads are the same product underneath and serve the same
+ * Instagram, Threads and Facebook are the same product underneath. The first
- * media schema, so both adapters normalize through here.
+ * two serve the same media schema, so both normalize through here; Facebook's
+ * is its own, but the headers its CDN wants and the link preview it falls
+ * back to are shared with them.
  */
 
 type Candidate = { url?: string; width?: number; height?: number };
@@ -66,6 +68,27 @@ export function mediaFromMetaNode(node: MetaMediaNode, referer: string): Media[]
   return [];
 }
 
+/**
+ * The link preview as media: the floor on all three, and all that is left
+ * when a post is refused to a logged-out reader.
+ */
+export function mediaFromOpenGraph(og: Record<string, string>, referer: string): Media[] {
+  const fetchHeaders = metaHeaders(referer);
+
+  if (og['og:video']) {
+    return [{
+      kind: 'video',
+      url: og['og:video'],
+      fetchHeaders,
+      ...(og['og:image'] ? { poster: { url: og['og:image'], fetchHeaders } } : {}),
+    }];
+  }
+  if (og['og:image']) {
+    return [{ kind: 'image', url: og['og:image'], fetchHeaders }];
+  }
+  return [];
+}
+
 function nonEmptyArray(value: unknown): boolean {
   return Array.isArray(value) && value.length > 0;
 }

src/platforms/reddit.ts

@@ -104,6 +104,10 @@ function fromRedditVideo(video: RedditVideo, poster: string | undefined): Media[
   const common = {
     ...sized(video.width, video.height),
     ...(video.duration ? { durationSec: video.duration } : {}),
+    // The still belongs to the video and not to the format it is served in.
+    // The HLS branch used to drop it, which is why a post with sound showed
+    // an empty box where every silent one showed a frame.
+    ...(poster ? { poster: { url: poster } } : {}),
   };
 
   if (video.has_audio !== false && video.hls_url) {
@@ -114,12 +118,7 @@ function fromRedditVideo(video: RedditVideo, poster: string | undefined): Media[
   if (url === video.hls_url) {
     return [{ kind: 'video', url, hls: true, direct: true, ...common }];
   }
-  return [{
+  return [{ kind: 'video', url, ...common }];
-    kind: 'video',
-    url,
-    ...(poster ? { poster: { url: poster } } : {}),
-    ...common,
-  }];
 }
 
 /** One entry of a gallery post. Reddit keeps the pictures somewhere other
@@ -192,14 +191,30 @@ function bodyOf(link: Link): string | undefined {
 /** The whole of `![...](...)`, with the target captured. */
 const INLINE_IMAGE = /!\[([^\]\n]*)\]\(([^)\s]+)\)/g;
 
+/**
+ * A Giphy token, which unlike the others says what it points at.
+ *
+ * Reddit writes a variant name after the id on some of them
+ * (`giphy|abc123|downsized`); only the id is kept, because Giphy does not
+ * serve every variant for every gif but always serves the full one.
+ */
+const GIPHY_TOKEN = /^giphy\|([A-Za-z0-9]+)(?:\|[a-z_]+)?$/;
+
 /**
  * Point a comment's inline images at something fetchable.
  *
  * Reddit writes them as `![gif](giphy|Ve7wX45)`, `![img](emote|t5_2th52|4358)`
- * or `![img](jo8gf0ca92zd1)` — a token rather than an address. In every case
+ * or `![img](jo8gf0ca92zd1)` — a token rather than an address. Usually the
- * the token is a key in that same comment's `media_metadata`, which is where
+ * token is a key in that same comment's `media_metadata`, which is where the
- * the real URL is, so one lookup covers all three and none of them needs
+ * real URL is, so one lookup covers all three and none of them needs naming
- * naming here.
+ * here.
+ *
+ * Usually, not always: Reddit ships plenty of comments carrying a Giphy token
+ * and no `media_metadata` at all, and with nothing to look the token up in
+ * those showed the token itself where the gif should have been. Giphy is the
+ * one kind that can be resolved without the lookup, the id in it being Giphy's
+ * own, so it falls back to Giphy's address for that id. The other two cannot:
+ * their ids mean nothing off Reddit.
  *
  * A target that is already an address is not a key, so it falls through
  * untouched.
@@ -208,15 +223,17 @@ export function resolveInlineImages(
   body: string,
   meta: Record<string, MediaMeta> | undefined,
 ): string {
-  if (!meta) return body;
-
   return body.replace(INLINE_IMAGE, (whole, alt: string, token: string) => {
-    const entry = meta[token];
+    const entry = meta?.[token];
-    if (!entry || entry.status !== 'valid') return whole;
+    if (entry?.status === 'valid') {
-    // An animated one has both; the GIF plays in an `<img>` on its own, which
+      // An animated one has both; the GIF plays in an `<img>` on its own,
-    // an MP4 does not.
+      // which an MP4 does not.
       const url = entry.s?.gif ?? entry.s?.u;
-    return url ? `![${alt}](${url})` : whole;
+      if (url) return `![${alt}](${url})`;
+    }
+
+    const giphy = GIPHY_TOKEN.exec(token)?.[1];
+    return giphy ? `![${alt}](https://i.giphy.com/media/${giphy}/giphy.gif)` : whole;
   });
 }
 

src/platforms/threads.ts

@@ -1,6 +1,12 @@
-import { ResolveError, type Media, type Post, type Segment } from '../types.ts';
+import { ResolveError, type Post, type Segment } from '../types.ts';
 import { readOpenGraph } from '../browser/capture.ts';
-import { findCaption, findMetaMedia, mediaFromMetaNode, metaHeaders, type MetaMediaNode } from './meta-media.ts';
+import {
+  findCaption,
+  findMetaMedia,
+  mediaFromMetaNode,
+  mediaFromOpenGraph,
+  type MetaMediaNode,
+} from './meta-media.ts';
 import { hostMatcher } from './url.ts';
 import type { PlatformSpec, ResolveContext } from './types.ts';
 
@@ -129,19 +135,7 @@ function segmentOf(post: ThreadsPost, isAnchor: boolean): Segment {
 /** The floor, when the structured payload is not there to be read. */
 async function fromOpenGraph(ctx: ResolveContext): Promise<Segment | undefined> {
   const og = await readOpenGraph(ctx.page);
-  const fetchHeaders = metaHeaders(REFERER);
+  const media = mediaFromOpenGraph(og, REFERER);
-  const media: Media[] = [];
-
-  if (og['og:video']) {
-    media.push({
-      kind: 'video',
-      url: og['og:video'],
-      fetchHeaders,
-      ...(og['og:image'] ? { poster: { url: og['og:image'], fetchHeaders } } : {}),
-    });
-  } else if (og['og:image']) {
-    media.push({ kind: 'image', url: og['og:image'], fetchHeaders });
-  }
 
   const text = og['og:description'];
   if (media.length === 0 && !text) return undefined;

src/platforms/url.ts

@@ -5,6 +5,7 @@
  */
 const TRACKING_PARAMS = new Set([
   'igsh', 'igshid', 'img_index', 'fbclid', 'gclid', 'mibextid',
+  'rdid', 'share_url', 'fs',
   'ref_src', 'ref_url', 'ref', 'source', 'checksum', 'social_sharing',
   's', 't', 'si', 'xmt', '_r', '_t', '_d',
   'is_from_webapp', 'sender_device', 'sender_web_id', 'web_id',

src/render/challenge.ts

@@ -28,7 +28,7 @@ export function renderChallenge(challenge: Challenge, box: Box | undefined): str
     <footer class="post__foot">
       <div class="original">
         <button type="button" class="copy" id="give-up">Give up and show me the link</button>
-        <a class="original__open" href="${challenge.originalUrl}" rel="noopener noreferrer nofollow" target="_blank">
+        <a class="original__open" href="${challenge.originalUrl}" rel="noopener noreferrer nofollow" target="_blank" hidden>
           Open on ${challenge.platformLabel}
         </a>
         <p class="original__url"><code>${challenge.originalUrl}</code></p>

src/render/index-page.ts

@@ -30,6 +30,14 @@ export function renderIndex(platforms: readonly PlatformSpec[]): string {
         )}
       </tbody>
     </table>
+    <section class="picker" hidden>
+      <label class="picker__label" for="open-in">Open original links in</label>
+      <select class="picker__select" id="open-in"></select>
+      <p class="picker__note">
+        The rewrite rules catch the original link too, so in Safari “Open on …” comes
+        straight back here. Another browser is a way out of that. Kept on this device.
+      </p>
+    </section>
   </article>`;
 
   return layout('antisocial', body);

src/render/layout.ts

@@ -29,6 +29,7 @@ const ACCENT: Record<string, { color: string; monogram: string }> = {
   x: { color: '#0f1419', monogram: '✕' },
   threads: { color: '#3b3b3b', monogram: '@' },
   instagram: { color: '#c13584', monogram: 'IG' },
+  facebook: { color: '#0866ff', monogram: 'f' },
   tiktok: { color: '#fe2c55', monogram: '♪' },
   bluesky: { color: '#0085ff', monogram: 'B' },
   reddit: { color: '#ff4500', monogram: 'r' },
@@ -43,14 +44,19 @@ export function badge(platform: string, label: string): Raw {
 }
 
 /** The copy control, plus the URL itself so it is always selectable even if
- *  the clipboard API is unavailable. */
+ *  the clipboard API is unavailable.
+ *
+ *  The open link ships hidden: followed in the browser the rewrite rules are
+ *  installed in, it redirects straight back here, so it is only worth showing
+ *  once a browser has been picked to hand it to. The script reveals it, and
+ *  the href in the markup is the plain address it starts from. */
 export function originalUrlBlock(originalUrl: string, platformLabel: string): Raw {
   return html`<div class="original">
     <button type="button" class="copy" data-url="${originalUrl}">
       <span class="copy__idle">Copy original link</span>
       <span class="copy__done" hidden>Copied</span>
     </button>
-    <a class="original__open" href="${originalUrl}" rel="noopener noreferrer nofollow" target="_blank">Open on ${platformLabel}</a>
+    <a class="original__open" href="${originalUrl}" rel="noopener noreferrer nofollow" target="_blank" hidden>Open on ${platformLabel}</a>
     <p class="original__url"><code>${originalUrl}</code></p>
   </div>`;
 }

src/render/post.ts

@@ -14,11 +14,29 @@ function aspect(item: Media): string {
   return item.width && item.height ? `aspect-ratio: ${item.width} / ${item.height};` : '';
 }
 
+/**
+ * A stand-in poster carrying nothing but the video's shape.
+ *
+ * The ratio above is not enough on its own before the video has any data: a
+ * `<video>` in that state has a natural size of 300x150, and WebKit sizes it
+ * from that rather than from the ratio, so a portrait video sat in a squat
+ * landscape box until you pressed play and it snapped to shape. A video's
+ * size before its data arrives is its poster's, which makes an empty SVG of
+ * the right shape enough to put the box right, and as a data URI it costs no
+ * request. Only for a video the platform gave no poster for, since a real one
+ * already says the same thing.
+ */
+function placeholderPoster(item: Media): string | undefined {
+  if (!item.width || !item.height) return undefined;
+  const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="${item.width}" height="${item.height}"/>`;
+  return `data:image/svg+xml,${encodeURIComponent(svg)}`;
+}
+
 function renderItem(item: Media, index: number): Raw {
   const src = proxyUrlFor(item);
 
   if (item.kind === 'video') {
-    const poster = item.poster ? proxyUrlFor(item.poster) : undefined;
+    const poster = item.poster ? proxyUrlFor(item.poster) : placeholderPoster(item);
     return html`<figure class="item item--video" data-index="${index}">
       <video
         controls

src/render/text.ts

@@ -6,6 +6,7 @@ const PROFILE_BASE: Record<PlatformId, string> = {
   x: 'https://x.com/',
   threads: 'https://www.threads.com/@',
   instagram: 'https://www.instagram.com/',
+  facebook: 'https://www.facebook.com/',
   tiktok: 'https://www.tiktok.com/@',
   bluesky: 'https://bsky.app/profile/',
   reddit: 'https://www.reddit.com/user/',

src/types.ts

@@ -1,5 +1,6 @@
 /** The platforms antisocial understands. */
-export type PlatformId = 'x' | 'threads' | 'instagram' | 'tiktok' | 'bluesky' | 'reddit';
+export type PlatformId =
+  | 'x' | 'threads' | 'instagram' | 'facebook' | 'tiktok' | 'bluesky' | 'reddit';
 
 /**
  * Something fetchable that lives on someone else's CDN.

test/browsers.test.ts

@@ -0,0 +1,47 @@
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import { browsersFor, detectOs, openUrlFor } from '../public/browsers.js';
+
+const URL = 'https://www.instagram.com/p/ABC/?a=1&b=2';
+
+test('each browser gets the scheme it actually answers to', () => {
+  assert.equal(openUrlFor(URL, 'chrome', 'macos'), 'googlechromes://www.instagram.com/p/ABC/?a=1&b=2');
+  assert.equal(openUrlFor(URL, 'chrome', 'ios'), 'googlechromes://www.instagram.com/p/ABC/?a=1&b=2');
+  assert.equal(openUrlFor('http://example.com/a', 'chrome', 'ios'), 'googlechrome://example.com/a');
+
+  // Edge folds the scheme into its own on iOS and prefixes it on macOS.
+  assert.equal(openUrlFor(URL, 'edge', 'macos'), `microsoft-edge:${URL}`);
+  assert.equal(openUrlFor(URL, 'edge', 'ios'), 'microsoft-edge-https://www.instagram.com/p/ABC/?a=1&b=2');
+
+  // The parameter form has to be encoded, or the original query string ends
+  // up read as the opener's own.
+  assert.equal(openUrlFor(URL, 'orion', 'macos'),
+    `orion://open-url?url=${encodeURIComponent(URL)}`);
+  assert.equal(openUrlFor(URL, 'firefox', 'ios'),
+    `firefox://open-url?url=${encodeURIComponent(URL)}`);
+});
+
+test('a browser with no scheme on this system keeps the plain link', () => {
+  // Firefox on macOS has none, and a dead scheme opens nothing at all --
+  // worse than opening in the wrong browser.
+  assert.equal(openUrlFor(URL, 'firefox', 'macos'), URL);
+  assert.equal(openUrlFor(URL, 'default', 'ios'), URL);
+  assert.equal(openUrlFor(URL, 'nonesuch', 'ios'), URL);
+});
+
+test('only ordinary web links are rewritten', () => {
+  assert.equal(openUrlFor('mailto:[email protected]', 'chrome', 'ios'), 'mailto:[email protected]');
+  assert.equal(openUrlFor('/reddit/r/a/comments/b', 'chrome', 'ios'), '/reddit/r/a/comments/b');
+});
+
+test('only the browsers reachable on that system are offered', () => {
+  assert.deepEqual(browsersFor('macos').map((b) => b.id), ['default', 'chrome', 'edge', 'orion']);
+  assert.deepEqual(browsersFor('ios').map((b) => b.id), ['default', 'chrome', 'edge', 'firefox', 'orion']);
+});
+
+test('an iPad is told from a Mac by its touch points, not its platform string', () => {
+  assert.equal(detectOs({ platform: 'iPhone', maxTouchPoints: 5 }), 'ios');
+  assert.equal(detectOs({ platform: 'MacIntel', maxTouchPoints: 5 }), 'ios');
+  assert.equal(detectOs({ platform: 'MacIntel', maxTouchPoints: 0 }), 'macos');
+  assert.equal(detectOs({}), 'macos');
+});

test/facebook.test.ts

@@ -0,0 +1,191 @@
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import {
+  findAuthor,
+  mediaFromAttachments,
+  mediaFromNode,
+  partsOfPost,
+  postIdFrom,
+  scrapeParts,
+} from '../src/platforms/facebook.ts';
+import { fixture } from './helpers.ts';
+
+// Real captures of what a logged-out Facebook page ships, trimmed of the DASH
+// manifests and tracking blobs the adapter never reads. Each is a different
+// shape: a reel arrives with the next reels of the feed attached, a photo post
+// keys itself by an opaque `pfbid` with no id in the address at all, and a
+// video post has its pieces scattered over four separate payload blocks.
+const REEL = 'https://www.facebook.com/reel/962551420197596/';
+const PHOTO_POST =
+  'https://www.facebook.com/NASA/posts/pfbid02yzKA4Z5Wnep5xU3PLWyWgRuVebWg3UZoATsEH3wuZcKoZuiLSBL8rEkbe4qTZ65Jl';
+const VIDEO_POST =
+  'https://www.facebook.com/NASA/videos/nancy-grace-roman-space-telescope-launch-trailer/1082585924135116/';
+
+const reel = () => fixture<unknown[]>('facebook/reel.json');
+const photoPost = () => fixture<unknown[]>('facebook/photo-post.json');
+const videoPost = () => fixture<unknown[]>('facebook/video-post.json');
+
+const scrape = (payloads: unknown[], id: string | undefined, url: string) =>
+  scrapeParts(partsOfPost(payloads, id, url));
+
+test('a reel is read as the reel that was linked, not the feed around it', () => {
+  const post = scrape(reel(), '962551420197596', REEL);
+
+  assert.equal(post.author?.name, 'SpeechProf');
+  assert.equal(post.text, 'I need answers.');
+  assert.equal(post.media.length, 1);
+  assert.equal(post.media[0]?.kind, 'video');
+});
+
+test('the reels Facebook staples on are really in the payload', () => {
+  // Without this the test above proves nothing: the whole point is that the
+  // page carries other people's reels in the same shape as the linked one.
+  const others = JSON.stringify(reel()).match(/facebook\.com\\?\/reel\\?\/(\d+)/g) ?? [];
+  const ids = new Set(others.map((match) => /(\d+)/.exec(match)?.[1]));
+  ids.delete('962551420197596');
+  assert.ok(ids.size > 0, 'the fixture should carry recommended reels too');
+});
+
+test('a portrait reel keeps its shape, its poster and its length', () => {
+  const item = scrape(reel(), '962551420197596', REEL).media[0];
+
+  assert.equal(item?.width, 720);
+  assert.equal(item?.height, 1280);
+  assert.equal(item?.kind === 'video' ? item.durationSec : undefined, 15);
+  assert.match(
+    item?.kind === 'video' ? (item.poster?.url ?? '') : '',
+    /scontent-.*fbcdn\.net/,
+  );
+});
+
+test('a post whose address carries no id is found by its permalink', () => {
+  const post = scrape(photoPost(), undefined, PHOTO_POST);
+
+  assert.match(post.author?.name ?? '', /^NASA/);
+  assert.match(post.text ?? '', /^25 years ago/);
+  assert.equal(post.media[0]?.kind, 'image');
+});
+
+test('the client configuration shipped alongside the post is not read as the post', () => {
+  // With neither an id nor a matching permalink there is nothing to anchor
+  // on, and the page's own configuration — thousands of nodes carrying a
+  // `name` — is what a plain search finds first.
+  const post = scrape(photoPost(), undefined, 'https://www.facebook.com/somewhere/else');
+
+  assert.match(post.author?.name ?? '', /^NASA/);
+});
+
+test('a video post is assembled from the several blocks it is split over', () => {
+  const post = scrape(videoPost(), '1082585924135116', VIDEO_POST);
+
+  // The name, the vanity address and the picture arrive in different blocks
+  // from the file and the timestamp; all of it has to end up on one post.
+  assert.match(post.author?.name ?? '', /^NASA/);
+  assert.equal(post.author?.url, 'https://www.facebook.com/NASA');
+  assert.ok(post.author?.profile_picture?.uri, 'the avatar is in a block of its own');
+  assert.match(post.text ?? '', /Nancy Grace Roman/);
+  assert.equal(post.postedAt, '2026-08-28T23:23:27.000Z');
+  assert.equal(post.media[0]?.kind, 'video');
+});
+
+test('someone commenting under the post is not mistaken for its author', () => {
+  const payloads = videoPost();
+  assert.ok(
+    JSON.stringify(payloads).includes('Michael Hall'),
+    'the fixture should carry the comments, which is what makes this a trap',
+  );
+
+  const author = findAuthor(partsOfPost(payloads, '1082585924135116', VIDEO_POST));
+  assert.match(author?.name ?? '', /^NASA/);
+});
+
+test('a page that answers to a different post is not read at all', () => {
+  // Facebook serves a link to something it no longer has by quietly handing
+  // back something else — `/watch/<id>` for a video that is gone comes back
+  // as the Watch home page, feed and all. A page that names neither the id
+  // nor the address is a failure rather than whatever happened to be on it.
+  assert.deepEqual(
+    partsOfPost(reel(), '111111111111111', 'https://www.facebook.com/watch/111111111111111/'),
+    [],
+  );
+});
+
+test('an address with no id in it still falls back to the query results', () => {
+  // The strictness above only applies where there was an id to check: a
+  // `pfbid` permalink has none, and refusing those would refuse every post
+  // shared from a page.
+  assert.notDeepEqual(partsOfPost(photoPost(), undefined, 'https://www.facebook.com/elsewhere'), []);
+});
+
+test('the id is taken from wherever the address keeps it', () => {
+  const id = (url: string) => postIdFrom(new URL(url));
+
+  assert.equal(id('https://www.facebook.com/reel/962551420197596/'), '962551420197596');
+  assert.equal(id('https://www.facebook.com/photo/?fbid=1626865842142119&set=a.41'), '1626865842142119');
+  assert.equal(id('https://www.facebook.com/watch/?v=1082585924135116'), '1082585924135116');
+  assert.equal(id('https://www.facebook.com/NASA/videos/some-slug/1082585924135116/'), '1082585924135116');
+  assert.equal(id('https://www.facebook.com/groups/123456789/posts/987654321/'), '987654321');
+  assert.equal(id('https://www.facebook.com/NASA/posts/pfbid02yzKA4Z5'), undefined);
+});
+
+test('`id` on a permalink is the page, not the post, so it is left alone', () => {
+  assert.equal(
+    postIdFrom(new URL('https://www.facebook.com/permalink.php?story_fbid=222222222&id=999999999')),
+    '222222222',
+  );
+  assert.equal(postIdFrom(new URL('https://www.facebook.com/profile.php?id=999999999')), undefined);
+});
+
+test('the better of the two files Facebook offers is the one used', () => {
+  const media = mediaFromNode({
+    videoDeliveryLegacyFields: {
+      browser_native_sd_url: 'https://video.example/sd.mp4',
+      browser_native_hd_url: 'https://video.example/hd.mp4',
+    },
+    preferred_thumbnail: { image: { uri: 'https://image.example/poster.jpg' } },
+  });
+
+  assert.equal(media[0]?.url, 'https://video.example/hd.mp4');
+  assert.equal(media[0]?.kind === 'video' ? media[0].poster?.url : undefined,
+    'https://image.example/poster.jpg');
+});
+
+test('an empty `all_subattachments` is a single picture, not a carousel', () => {
+  // Facebook ships the key on every post, so its presence says nothing.
+  const media = mediaFromAttachments([
+    {
+      all_subattachments: { nodes: [] },
+      styles: { attachment: { media: { photo_image: { uri: 'https://image.example/one.jpg' } } } },
+    },
+  ]);
+
+  assert.deepEqual(media.map((item) => item.url), ['https://image.example/one.jpg']);
+});
+
+test('a populated `all_subattachments` is every picture in the post', () => {
+  const media = mediaFromAttachments([
+    {
+      media: { photo_image: { uri: 'https://image.example/cover.jpg' } },
+      all_subattachments: {
+        nodes: [
+          { media: { photo_image: { uri: 'https://image.example/1.jpg' } } },
+          { media: { photo_image: { uri: 'https://image.example/2.jpg', width: 8, height: 6 } } },
+        ],
+      },
+    },
+  ]);
+
+  assert.deepEqual(media.map((item) => item.url), [
+    'https://image.example/1.jpg',
+    'https://image.example/2.jpg',
+  ]);
+  assert.equal(media[1]?.width, 8);
+});
+
+test('every asset carries the headers the Facebook CDN is given', () => {
+  const post = scrape(reel(), '962551420197596', REEL);
+  const item = post.media[0];
+
+  assert.equal(item?.fetchHeaders?.['Referer'], 'https://www.facebook.com/');
+  assert.equal(item?.fetchHeaders?.['Origin'], 'https://www.facebook.com');
+});

test/fixtures/facebook/reel.json

@@ -0,0 +1,775 @@
+[
+ {
+  "require": [
+   [
+    "ScheduledServerJS",
+    "handle",
+    null,
+    [
+     {
+      "__bbox": {
+       "define": [
+        [
+         "VideoPlayerShakaPerformanceLoggerConfig",
+         [],
+         {
+          "isSampled": false
+         },
+         1760
+        ]
+       ],
+       "require": [
+        [
+         "useVideoPlayerShakaPerformanceLoggerRelayImpl_init$normalization.graphql"
+        ],
+        [
+         "VideoPlayerShakaPerformanceLogger"
+        ],
+        [
+         "useVideoPlayerShakaPerformanceLoggerBuilder_init$normalization.graphql"
+        ],
+        [
+         "VideoPlayerShakaPerformanceLoggerBuilder"
+        ],
+        [
+         "emptyFunction",
+         "thatReturns",
+         [
+          "RequireDeferredReference"
+         ],
+         [
+          [
+           {
+            "__dr": "useVideoPlayerShakaPerformanceLoggerRelayImpl_init$normalization.graphql"
+           },
+           {
+            "__dr": "VideoPlayerShakaPerformanceLogger"
+           },
+           {
+            "__dr": "useVideoPlayerShakaPerformanceLoggerBuilder_init$normalization.graphql"
+           },
+           {
+            "__dr": "VideoPlayerShakaPerformanceLoggerBuilder"
+           }
+          ]
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+                     "viewer_autoplay_setting": "default_autoplay",
+                     "can_autoplay": false,
+                     "drm_info": "{\"video_license_uri_map\":{},\"graph_api_video_license_uri\":null,\"fairplay_cert\":null,\"widevine_cert\":\"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\"}",
+                     "p2p_settings": null,
+                     "audio_settings": null,
+                     "captions_settings": null,
+                     "broadcast_low_latency_config": null,
+                     "audio_availability": "AVAILABLE",
+                     "muted_segments": [],
+                     "spherical_video_renderer": null,
+                     "preferred_thumbnail": {
+                      "image": {
+                       "uri": "https://scontent-lga3-1.xx.fbcdn.net/v/t15.5256-10/753306317_2059899598252019_7051428696037703086_n.jpg?stp=dst-jpg_tt6&cstp=mx1080x1920&ctp=s960x960&_nc_cat=110&ccb=1-7&_nc_sid=50ce42&_nc_ohc=fFK4qXTnhggQ7kNvwFoTF67&_nc_oc=Adpv6Qoge3bNmPKNIgAXN0RllPhOMDn0nss-rohiTyvwYOtqLQgnEd0BY6Nifk2O4h0&_nc_zt=23&_nc_ht=scontent-lga3-1.xx&_nc_gid=Nu_C1-ECquUeBWruTCocWg&_nc_ss=7b289&oh=00_AQJEw5D-XUGzIDqfRvd3PYV2VHJbnaJgnBz6niOzlyw-Jw&oe=6AAB2BA6"
+                      },
+                      "id": "2299143310889572"
+                     },
+                     "video_imf_data": null,
+                     "playback_language_on_comet": null,
+                     "warning_screen_renderer": null,
+                     "cix_screen": null
+                    },
+                    "video_owner": {
+                     "__typename": "User",
+                     "id": "100076751910580",
+                     "__isActor": "User",
+                     "name": "SpeechProf",
+                     "enable_reels_tab_deeplink": true,
+                     "is_verified": true,
+                     "url": "https://www.facebook.com/thespeechprof",
+                     "displayPicture": {
+                      "uri": "https://scontent-lga3-2.xx.fbcdn.net/v/t39.30808-1/326766781_846259129812200_6375271311855814882_n.jpg?stp=cp0_dst-jpg_tt6&cstp=mx540x539&ctp=s40x40&_nc_cat=101&ccb=1-7&_nc_sid=2d3e12&_nc_ohc=h1w1WbToKCgQ7kNvwHgQfMo&_nc_oc=AdqONFEgDcyJWpqq-pZOcHmQbYRuUA60g8gdRhTYljTeq6bGuiQuEBqGHzsevPklY6w&_nc_zt=24&_nc_ht=scontent-lga3-2.xx&_nc_gid=Nu_C1-ECquUeBWruTCocWg&_nc_ss=7b289&oh=00_AQKKGnBsOOARN0WgCapFue7PDpv0Wp3qriUdFQkGVXdSLQ&oe=6AAB216C"
+                     },
+                     "should_show_reels_follow_back_cta": false,
+                     "subscribe_status": "CANNOT_SUBSCRIBE",
+                     "delegate_page": {
+                      "id": "103285455517243",
+                      "uri_token": "thespeechprof",
+                      "woodhenge_creator_info": {
+                       "viewer_entrypoint_eligibility": {
+                        "is_eligible": true
+                       },
+                       "id": "272843125228141:FubsCreatorInfo",
+                       "viewer_active_subscription_entitlement": null
+                      }
+                     }
+                    },
+                    "fb_shorts_reshare_context": {
+                     "is_reshare": false,
+                     "reshare_creator": {
+                      "__typename": "User",
+                      "__isActor": "User",
+                      "id": "100076751910580",
+                      "name": "SpeechProf",
+                      "enable_reels_tab_deeplink": true,
+                      "is_verified": true,
+                      "url": "https://www.facebook.com/thespeechprof"
+                     }
+                    },
+                    "remix_info": {
+                     "is_remixable": true,
+                     "status": "DISABLED"
+                    },
+                    "video_owner_type": "FACEBOOK_USER",
+                    "soundtrack_info": {
+                     "id": "27856252440654104",
+                     "type": "CUSTOM_AUDIO"
+                    },
+                    "track_title": "SpeechProf · Original audio",
+                    "music_album_art_uri": "https://scontent-lga3-2.xx.fbcdn.net/v/t39.30808-1/326766781_846259129812200_6375271311855814882_n.jpg?stp=cp0_dst-jpg_tt6&cstp=mx540x539&ctp=s64x64&_nc_cat=101&ccb=1-7&_nc_sid=2d3e12&_nc_ohc=h1w1WbToKCgQ7kNvwHgQfMo&_nc_oc=AdqONFEgDcyJWpqq-pZOcHmQbYRuUA60g8gdRhTYljTeq6bGuiQuEBqGHzsevPklY6w&_nc_zt=24&_nc_ht=scontent-lga3-2.xx&_nc_gid=Nu_C1-ECquUeBWruTCocWg&_nc_ss=7b289&oh=00_AQKKGnBsOOARN0WgCapFue7PDpv0Wp3qriUdFQkGVXdSLQ&oe=6AAB216C",
+                    "is_original_audio_on_facebook": true
+                   },
+                   "id": "UzpfSTEwMDA3Njc1MTkxMDU4MDpWSzo0Mzk0NjMzNTE3NDg2MDk4",
+                   "sponsored_data": null,
+                   "brand_safety_data": null,
+                   "post_id": "1067862332448821",
+                   "creation_time": 1784756186,
+                   "unpublished_content_type": "PUBLISHED",
+                   "scheduled_publish_time": null,
+                   "sponsor_relationship": 0,
+                   "branded_content_post_info": null,
+                   "creator_collaboration": null,
+                   "media_attribution_elements": [],
+                   "attachments": [
+                    {
+                     "media": {
+                      "__typename": "Video",
+                      "is_made_with_meta_ai_app": false,
+                      "__isNode": "Video",
+                      "id": "4394633517486098",
+                      "video_delivery_response": {
+                       "transcript_urls": [],
+                       "id": "4394633517486098"
+                      }
+                     },
+                     "call_to_action_renderer": null
+                    }
+                   ],
+                   "can_viewer_delete": false,
+                   "can_viewer_edit": false,
+                   "can_viewer_cancel_collaboration_invite": false,
+                   "can_viewer_remove_collaborator": false,
+                   "can_viewer_see_collaboration_invite": false,
+                   "legal_reporting_cta_type": null,
+                   "legal_reporting_uri": null,
+                   "to": null,
+                   "video": {
+                    "id": "4394633517486098",
+                    "owner": {
+                     "__typename": "User",
+                     "id": "100076751910580"
+                    }
+                   },
+                   "post_collaboration": null,
+                   "can_viewer_remove_self_as_collaborator": false,
+                   "if_viewer_can_see_stars_toggle_menu_option": null,
+                   "transparency_ad_info": {
+                    "menu_label": "Ad info",
+                    "should_display_ad_info": false
+                   },
+                   "debug_info": null,
+                   "inform_treatment_for_community_notes": null,
+                   "message": {
+                    "text": "Love you Ryan & Craig and sorry for any future confusion 🤣",
+                    "ranges": [
+                     {
+                      "offset": 9,
+                      "length": 12,
+                      "entity": {
+                       "__typename": "User",
+                       "__isEntity": "User",
+                       "mobileUrl": "https://m.facebook.com/StorytimewithRyanandCraig/",
+                       "url": "https://www.facebook.com/StorytimewithRyanandCraig",
+                       "__isNode": "User",
+                       "id": "100064615544947"
+                      }
+                     }
+                    ]
+                   },
+                   "translated_message_for_viewer": null,
+                   "contextualElementShortFormContext": {
+                    "video_label": null
+                   },
+                   "__isNode": "Story"
+                  },
+                  "cursor": "1",
+                  "id": "UzpfSTEwMDA3Njc1MTkxMDU4MDpWSzo0Mzk0NjMzNTE3NDg2MDk4"
+                 }
+                ],
+                "page_info": {
+                 "end_cursor": "5",
+                 "has_next_page": false
+                }
+               }
+              },
+              "qp_viewer": {
+               "eligible_promotions": {
+                "nodes": []
+               }
+              }
+             }
+            },
+            "sequence_number": 0
+           }
+          }
+         ]
+        ],
+        [
+         "RequireDeferredReference",
+         "unblock",
+         [],
+         [
+          [
+           "useVideoPlayerShakaPerformanceLoggerRelayImpl_init$normalization.graphql",
+           "VideoPlayerShakaPerformanceLogger",
+           "useVideoPlayerShakaPerformanceLoggerBuilder_init$normalization.graphql",
+           "VideoPlayerShakaPerformanceLoggerBuilder"
+          ],
+          "sd"
+         ]
+        ],
+        [
+         "RequireDeferredReference",
+         "unblock",
+         [],
+         [
+          [
+           "useVideoPlayerShakaPerformanceLoggerRelayImpl_init$normalization.graphql",
+           "VideoPlayerShakaPerformanceLogger",
+           "useVideoPlayerShakaPerformanceLoggerBuilder_init$normalization.graphql",
+           "VideoPlayerShakaPerformanceLoggerBuilder"
+          ],
+          "css"
+         ]
+        ],
+        [
+         "CometResourceScheduler",
+         "registerHighPriHashes",
+         null,
+         [
+          [
+           "yFGOD2w",
+           "eZENHpr",
+           "c7oHeza",
+           "pvDSJnA",
+           "tWsD7LM",
+           "SG1FRQy"
+          ]
+         ]
+        ]
+       ],
+       "phd2_indexes": ":401,400,402,403"
+      }
+     },
+     {
+      "__bbox": null
+     },
+     {
+      "__bbox": null
+     }
+    ]
+   ]
+  ]
+ }
+]

test/meta-media.test.ts

@@ -1,6 +1,11 @@
 import assert from 'node:assert/strict';
 import { test } from 'node:test';
-import { findCaption, findMetaMedia, mediaFromMetaNode } from '../src/platforms/meta-media.ts';
+import {
+  findCaption,
+  findMetaMedia,
+  mediaFromMetaNode,
+  mediaFromOpenGraph,
+} from '../src/platforms/meta-media.ts';
 import { fixture } from './helpers.ts';
 
 const REFERER = 'https://www.threads.com/';
@@ -68,3 +73,22 @@ test('the caption is found the same way, and an empty one is not a caption', ()
   assert.equal(findCaption({ x: { caption: { text: '' } } }), undefined);
   assert.equal(findCaption({ x: { caption: null } }), undefined);
 });
+
+test('the link preview stands in for the post when there is nothing better', () => {
+  const image = mediaFromOpenGraph({ 'og:image': 'https://image.example/a.jpg' }, REFERER);
+  assert.deepEqual(image.map((item) => [item.kind, item.url]), [['image', 'https://image.example/a.jpg']]);
+  assert.equal(image[0]?.fetchHeaders?.['Referer'], REFERER);
+});
+
+test('a preview naming a video is a video, and its image is the poster', () => {
+  const media = mediaFromOpenGraph(
+    { 'og:video': 'https://video.example/a.mp4', 'og:image': 'https://image.example/a.jpg' },
+    REFERER,
+  );
+  assert.equal(media[0]?.kind, 'video');
+  assert.equal(media[0]?.kind === 'video' ? media[0].poster?.url : undefined, 'https://image.example/a.jpg');
+});
+
+test('a page with no preview at all yields no media rather than an empty asset', () => {
+  assert.deepEqual(mediaFromOpenGraph({ 'og:title': 'just a title' }, REFERER), []);
+});

test/reddit.test.ts

@@ -56,6 +56,7 @@ test('a video with sound is the HLS playlist, because the MP4 has no audio track
         duration: 42,
       },
     },
+    preview: { images: [{ source: { url: 'https://external-preview.redd.it/still.png', width: 1920, height: 1080 } }] },
   });
 
   assert.deepEqual(media, [
@@ -67,6 +68,9 @@ test('a video with sound is the HLS playlist, because the MP4 has no audio track
       width: 1920,
       height: 1080,
       durationSec: 42,
+      // The still is the video's, not the MP4's. Dropping it here left every
+      // post with sound showing an empty box where a silent one showed a frame.
+      poster: { url: 'https://external-preview.redd.it/still.png' },
     },
   ]);
 });
@@ -224,13 +228,63 @@ test('a target that is already an address is left alone', () => {
 });
 
 test('a token with no entry, or a broken one, is not invented', () => {
-  assert.equal(resolveInlineImages('![gif](giphy|missing)', GIPHY), '![gif](giphy|missing)');
+  // An upload id and an emote id mean nothing off Reddit, so with no entry to
+  // look them up in there is nothing to point them at.
+  assert.equal(resolveInlineImages('![img](missing)', GIPHY), '![img](missing)');
   assert.equal(
     resolveInlineImages('![img](gone)', { gone: { status: 'failed', e: 'Image' } }),
     '![img](gone)',
   );
 });
 
+test('a giphy token resolves even when the comment carried no metadata', () => {
+  // Reddit ships plenty of these with no `media_metadata` at all. The id in
+  // the token is Giphy's own, so it does not need Reddit to be readable.
+  assert.equal(
+    resolveInlineImages('![gif](giphy|zUW23b6FmzB5e)', undefined),
+    '![gif](https://i.giphy.com/media/zUW23b6FmzB5e/giphy.gif)',
+  );
+  assert.equal(
+    resolveInlineImages('![gif](giphy|missing)', GIPHY),
+    '![gif](https://i.giphy.com/media/missing/giphy.gif)',
+  );
+});
+
+test('the metadata still wins where there is any, being what Reddit will serve', () => {
+  assert.match(resolveInlineImages('![gif](giphy|Ve7wX45gaOFmw8eeEM)', GIPHY), /redd\.it/);
+});
+
+test('a variant name after the id is dropped, not all of them being served', () => {
+  assert.equal(
+    resolveInlineImages('![gif](giphy|zUW23b6FmzB5e|downsized)', undefined),
+    '![gif](https://i.giphy.com/media/zUW23b6FmzB5e/giphy.gif)',
+  );
+});
+
+test('only a giphy token is guessed at, and only a well-formed one', () => {
+  for (const token of ['emote|t5_2th52|4358', 'giphy|', 'giphy|../evil', 'giphy|a|b|c']) {
+    assert.equal(resolveInlineImages(`![x](${token})`, undefined), `![x](${token})`);
+  }
+});
+
+test('a real comment carrying a giphy token gets the gif', () => {
+  // Captured from the post itself: the comment has the token and no
+  // `media_metadata`, which is the shape that used to show the token instead.
+  const post = toPost(fixture('reddit/video.json'), URL_);
+  const all: string[] = [];
+  const walk = (list: typeof post.comments) => {
+    for (const comment of list ?? []) {
+      if (comment.text) all.push(comment.text);
+      walk(comment.replies);
+    }
+  };
+  walk(post.comments);
+
+  const gif = all.find((text) => text.includes('giphy'));
+  assert.ok(gif, 'the fixture should still carry a giphy comment');
+  assert.match(gif, /!\[gif\]\(https:\/\/i\.giphy\.com\/media\/QfzMP70zmNQiDf5sGP\/giphy\.gif\)/);
+});
+
 test('inline images survive the walk into the comment tree', () => {
   const { comments } = commentsFrom({
     data: {

test/render.test.ts

@@ -90,6 +90,27 @@ test('a video gets native controls and a source, not an iframe', () => {
   assert.ok(!page.includes('<iframe'));
 });
 
+test('a video with no poster still carries its shape, so the box is right before play', () => {
+  // WebKit sizes a video from its natural size, which without data or a
+  // poster is 300x150 — a portrait video sat in a landscape box until you
+  // pressed play. The poster is where the shape comes from until then.
+  const page = renderPost(withMedia([
+    { kind: 'video', url: 'https://video.example/p.m3u8', hls: true, direct: true, width: 720, height: 1280 },
+  ]));
+  assert.ok(page.includes('aspect-ratio: 720 / 1280;'));
+  assert.match(page, /poster="data:image\/svg\+xml,[^"]*width%3D%22720%22[^"]*height%3D%221280%22/);
+});
+
+test('a real poster is left in place, and an unmeasured video gets none', () => {
+  const withPoster = renderPost(withMedia([
+    { kind: 'video', url: 'https://cdn/v.mp4', width: 720, height: 1280, poster: { url: 'https://cdn/p.jpg' } },
+  ]));
+  assert.match(withPoster, /poster="\/m\//);
+  assert.ok(!withPoster.includes('data:image/svg'));
+
+  assert.ok(!renderPost(withMedia([{ kind: 'video', url: 'https://cdn/v.mp4' }])).includes('poster='));
+});
+
 test('the copy button carries the clean original URL, and so does the page text', () => {
   const page = renderPost(post());
   assert.ok(page.includes('data-url="https://www.instagram.com/p/ABC/"'));
@@ -105,8 +126,12 @@ test('a failure still hands the link back', () => {
     detail: 'TikTok showed a verification puzzle instead of the post.',
   });
   assert.ok(page.includes('data-url="https://www.tiktok.com/@a/video/1"'));
-  assert.ok(page.includes('Open on TikTok'));
+  assert.ok(page.includes('<code>https://www.tiktok.com/@a/video/1</code>'));
   assert.ok(page.includes('verification puzzle'));
+  // Following the original link in the browser the rewrite rules are
+  // installed in only comes back here, so it stays hidden until the script
+  // has a browser to hand it to.
+  assert.ok(/<a class="original__open"[^>]* hidden>Open on TikTok<\/a>/.test(page));
 });
 
 function redditPost(overrides: Partial<Post> = {}): Post {

tsconfig.json

@@ -17,6 +17,10 @@
     // Source imports carry the real `.ts` specifier so `node --experimental-
     // strip-types` can run the tree directly for dev, tests and the resolve
     // CLI. tsc rewrites them to `.js` on the way into dist.
+    // The client-side scheme table is plain JS, because the browser loads it
+    // as-is out of `public`. Its types are inferred so the test can check it.
+    "allowJs": true,
+
     "allowImportingTsExtensions": true,
     "rewriteRelativeImportExtensions": true,