Redirect before calling Youtube

Implements #6

extension/manifest.json

@@ -12,7 +12,9 @@
   "permissions": [
     "activeTab",
     "storage",
-    "<all_urls>"
+    "<all_urls>",
+    "webRequest",
+    "webRequestBlocking"
   ],
   "background": {
     "scripts": ["dist/background.js", "dist/vendors.js"]

src/background.ts

@@ -17,8 +17,41 @@
 import * as _ from 'lodash/fp';
 import * as browser from 'webextension-polyfill';
 
-import { MessageKind } from './types';
+import { MessageKind, RedirectType } from './types';
 import constants from './constants';
+import Preferences from './preferences';
+import InvidiousAPI from './invidious-api';
+import { getPeertubeVideoURL } from './util';
+
+/**
+ * Retrieve the title of the video using Invidious API.
+ */
+const getTitle = async (id: string) => {
+    const data = await InvidiousAPI.getVideo(id);
+    return data.title;
+}
+
+/**
+ * Prevent Youtube from loading if the video is found and preferences set on
+ * automatic redirection.
+ */
+const preventYoutube = async (r) => {
+    const prefs = await Preferences.getPreferences();
+
+    if (prefs.redirectYoutube == RedirectType.Auto) {
+        const query = new URLSearchParams(r.url.substring(r.url.indexOf('?') + 1));
+
+        const title = await getTitle(query.get('v'));
+        const video = await searchByName(title);
+        const url = getPeertubeVideoURL(video, prefs);
+
+        return {
+            redirectUrl: url
+        };
+    }
+
+    throw new Error('No results.');
+};
 
 const buildSearchByNameURL = (instance: string, query: string): string => `https://${instance}/api/v1/search/videos?search=${encodeURIComponent(query)}`;
 
@@ -58,3 +91,9 @@ browser.runtime.onMessage.addListener(function(message, sender) {
             return searchByID(message.id);
     }
 });
+
+browser.webRequest.onBeforeRequest.addListener(
+    preventYoutube,
+    { urls: ['*://*.youtube.com/watch?v=*'] },
+    ['blocking']
+);

src/constants.ts

@@ -1,3 +1,8 @@
 export default {
-  defaultInstance: 'peertube.social'
+    defaultInstance: 'peertube.social',
+    invidiousAPI: {
+        url: 'https://invidio.us/api/v1',
+        videos: 'videos',
+        channels: 'channels'
+    }
 };

src/invidious-api.ts

@@ -0,0 +1,27 @@
+import * as _ from 'lodash/fp';
+import constants from './constants';
+
+export default class InvidiousAPI {
+    private static async fetchAPI(action: string, params: any) {
+        const paramString = typeof params == 'string'
+            ? params
+            : Object.keys(params).map(function(key) {
+                return encodeURIComponent(key) + '=' + encodeURIComponent(params[key]);
+            }).join('&');
+
+        return fetch(`${constants.invidiousAPI.url}/${action}/${paramString}`)
+            .then(res => res.json())
+            .catch(e => console.error(
+                'An error occured while trying to fetch API used by PeerTubeify: '
+                + e.message
+            ));
+    }
+
+    static async getVideo(id: string) {
+        return this.fetchAPI(constants.invidiousAPI.videos, id);
+    }
+
+    static async getChannel(ucid: string) {
+        return this.fetchAPI(constants.invidiousAPI.channels, ucid);
+    }
+}

src/util.ts

@@ -3,3 +3,11 @@ export function htmlToElement(html: string): Element {
     template.innerHTML = html.trim();
     return template.content.firstElementChild;
 }
+
+export function getPeertubeVideoURL(video, prefs) {
+    return `https://${getPeertubeHost(video.account.host, prefs)}/videos/watch/${video.uuid}`
+}
+
+export function getPeertubeHost(host, prefs) {
+    return prefs.openInOriginalInstance ? host : prefs.searchInstance;
+}

src/youtube.ts

@@ -17,11 +17,10 @@
 import * as _ from 'lodash/fp';
 import * as browser from 'webextension-polyfill';
 
-import { htmlToElement } from './util';
+import { htmlToElement, getPeertubeVideoURL } from './util';
 import { MessageKind, RedirectType } from './types';
 import Preferences from './preferences'
 
-const watchURL = (host, uuid) => `https://${host}/videos/watch/${uuid}`;
 const thumbnailURL = (host, path) => `https://${host}${path}`;
 
 const LINK_ID = 'peertube-link';
@@ -33,10 +32,6 @@ function searchVideo(query) {
     });
 }
 
-function getCorrectURL(video: any, prefs: Preferences) {
-    return watchURL(prefs.openInOriginalInstance ? video.account.host : prefs.searchInstance, video.uuid)
-}
-
 async function peertubeify(query: String) {
     const prefs = await Preferences.getPreferences();
 
@@ -44,7 +39,7 @@ async function peertubeify(query: String) {
         case RedirectType.Show: {
             searchVideo(query)
                 .then(async video => {
-                    const url = getCorrectURL(video, prefs)
+                    const url = getPeertubeVideoURL(video, prefs)
                     const link = videoLink(url, video);
 
                     removeVideoLink();
@@ -52,14 +47,6 @@ async function peertubeify(query: String) {
                 }).catch(removeVideoLink);
             break;
         }
-        case RedirectType.Auto: {
-            searchVideo(query)
-                .then(async video => {
-                    const url = getCorrectURL(video, prefs)
-                    location.replace(url);
-                });
-            break;
-        }
         case RedirectType.None: {
             break;
         }