services: add facebook support (#403)

* feat: add facebook support

* chore: fix fail check

* chore: minor fix

* chore: add service in README.md

* chore: cleaning post-merge code

* facebook: add shared link pattern

* chore: clean up removing unnecessarily code

* fix: facebook shared link pattern

* matchActionDecider: redirect to facebook video instead of rendering

* facebook: pass sourceUrl in object

* url: fix botched lint

* fix: facebook shared link pattern with clean up

* test: change facebook test response to redirect

---------

Co-authored-by: dumbmoron <log@riseup.net>

README.md

@@ -19,6 +19,7 @@ this list is not final and keeps expanding over time. if support for a service y
 | bilibili.com & bilibili.tv     | ✅            | ✅         | ✅         | ➖         | ➖              |
 | dailymotion                    | ✅            | ✅         | ✅         | ✅         | ✅              |
 | instagram posts & reels        | ✅            | ✅         | ✅         | ➖         | ➖              |
+| facebook videos                | ✅            | ❌         | ❌         | ➖         | ➖              |
 | loom                           | ✅            | ❌         | ✅         | ✅         | ➖              |
 | ok video                       | ✅            | ❌         | ✅         | ✅         | ✅              |
 | pinterest                      | ✅            | ✅         | ✅         | ➖         | ➖              |
@@ -45,6 +46,7 @@ this list is not final and keeps expanding over time. if support for a service y
 | service    | notes or features                                                                                                    |
 | :--------  | :-----                                                                                                               |
 | instagram  | supports reels, photos, and videos. lets you pick what to save from multi-media posts.                               |
+| facebook   | supports public accessible videos content only.                                                                      |
 | pinterest  | supports photos, gifs, videos and stories.                                                                           |
 | reddit     | supports gifs and videos.                                                                                            |
 | rutube     | supports yappy & private links.                                                                                      |

src/modules/processing/match.js

@@ -25,6 +25,7 @@ import twitch from "./services/twitch.js";
 import rutube from "./services/rutube.js";
 import dailymotion from "./services/dailymotion.js";
 import loom from "./services/loom.js";
+import facebook from "./services/facebook.js";
 
 let freebind;
 
@@ -192,6 +193,11 @@ export default async function(host, patternMatch, lang, obj) {
                 r = await loom({
                     id: patternMatch.id
                 });
+            case "facebook":
+                r = await facebook({
+                    ...patternMatch,
+                    sourceUrl: url.href
+                });
                 break;
             default:
                 return createResponse("error", {

src/modules/processing/matchActionDecider.js

@@ -130,6 +130,7 @@ export default function(r, host, userFormat, isAudioOnly, lang, isAudioMuted, di
                     params = { type: "bridge" };
                     break;
 
+                case "facebook":
                 case "vine":
                 case "instagram":
                 case "tumblr":

src/modules/processing/services/facebook.js

@@ -0,0 +1,62 @@
+import { genericUserAgent } from "../../config.js";
+
+const headers = {
+    'User-Agent': genericUserAgent,
+    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8',
+    'Accept-Language': 'en-US,en;q=0.5',
+    'Accept-Encoding': 'gzip, deflate, br',
+    'Sec-Fetch-Mode': 'navigate',
+    'Sec-Fetch-Site': 'none',
+}
+
+function resolveUrl(url) {
+    return fetch(url, { headers })
+        .then(r => {
+            if (r.headers.get('location')) {
+                return decodeURIComponent(r.headers.get('location'))
+            }
+            if (r.headers.get('link')) {
+                const linkMatch = r.headers.get('link').match(/<(.*?)\/>/)
+                return decodeURIComponent(linkMatch[1])
+            }
+            return false
+        })
+        .catch(() => false)
+}
+
+export default async function({ sourceUrl, shortLink, username, id }) {
+    const isShortLink = !!shortLink?.length
+    const isSharedLink = !!sourceUrl.match(/\/share\/\w\//)?.length
+
+    let url = isShortLink
+        ? `https://fb.watch/${shortLink}`
+        : `https://web.facebook.com/${username}/videos/${id}`
+
+    if (isShortLink) url = await resolveUrl(url)
+    if (isSharedLink) url = sourceUrl
+
+    const html = await fetch(url, { headers })
+        .then(r => r.text())
+        .catch(() => false)
+
+    if (!html) return { error: 'ErrorCouldntFetch' };
+
+    const urls = []
+    const hd = html.match('"browser_native_hd_url":(".*?")')
+    const sd = html.match('"browser_native_sd_url":(".*?")')
+
+    if (hd?.[1]) urls.push(JSON.parse(hd[1]))
+    if (sd?.[1]) urls.push(JSON.parse(sd[1]))
+
+    if (!urls.length) {
+        return { error: 'ErrorEmptyDownload' };
+    }
+
+    let filename = `facebook_${id || shortLink}.mp4`
+
+    return {
+        urls: urls[0],
+        filename,
+        audioFilename: `${filename.slice(0, -4)}_audio`,
+    };
+}

src/modules/processing/servicesConfig.json

@@ -118,6 +118,19 @@
             "alias": "loom videos",
             "patterns": ["share/:id"],
             "enabled": true
+        },
+        "facebook": {
+            "alias": "facebook videos",
+            "altDomains": ["fb.watch"],
+            "subdomains": ["web"],
+            "patterns": [
+                "_shortLink/:shortLink",
+                ":username/videos/:caption/:id",
+                ":username/videos/:id",
+                "reel/:id",
+                "share/:shortLink/:id"
+            ],
+            "enabled": true
         }
     }
 }

src/modules/processing/servicesPatternTesters.js

@@ -58,4 +58,10 @@ export const testers = {
 
     "youtube": (patternMatch) =>
         patternMatch.id?.length <= 11,
+
+    "facebook": (patternMatch) =>
+        patternMatch.shortLink?.length <= 11
+        || patternMatch.username?.length <= 30
+        || patternMatch.caption?.length <= 255
+        || patternMatch.id?.length <= 20,
 }

src/modules/processing/url.js

@@ -64,7 +64,17 @@ function aliasURL(url) {
             if (url.hostname === 'dai.ly' && parts.length === 2) {
                 url = new URL(`https://dailymotion.com/video/${parts[1]}`)
             }
+
+        case "facebook":
+        case "fb":
+            if (url.searchParams.get('v')) {
+                url = new URL(`https://web.facebook.com/user/videos/${url.searchParams.get('v')}`)
+            }
+            if (url.hostname === 'fb.watch') {
+                url = new URL(`https://web.facebook.com/_shortLink/${parts[1]}`)
+            }
             break;
+
         case "ddinstagram":
             if (services.instagram.altDomains.includes(host.domain) && [null, 'd', 'g'].includes(host.subdomain)) {
                 url.hostname = 'instagram.com';

src/util/tests.json

@@ -1160,5 +1160,62 @@
             "code": 400,
             "status": "error"
         }
+    }],
+    "facebook": [{
+        "name": "direct video with username and id",
+        "url": "https://web.facebook.com/100048111287134/videos/1157798148685638/",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "direct video with id as query param",
+        "url": "https://web.facebook.com/watch/?v=883839773514682&ref=sharing",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "direct video with caption",
+        "url": "https://web.facebook.com/wood57/videos/𝐒𝐞𝐛𝐚𝐬𝐤𝐨𝐦-𝐟𝐮𝐥𝐥/883839773514682",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "shortlink video",
+        "url": "https://fb.watch/r1K6XHMfGT/",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "reel video",
+        "url": "https://web.facebook.com/reel/730293269054758",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "shared video link",
+        "url": "https://www.facebook.com/share/v/NEf87jbPTvFE8LsL/",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
+    }, {
+        "name": "shared video link v2",
+        "url": "https://web.facebook.com/share/r/JFZfPVgLkiJQmWrr/",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "redirect"
+        }
     }]
 }