idillon | a3c2fad | 2022-12-18 23:49:10 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2022 Savoir-faire Linux Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU Affero General Public License as |
| 6 | * published by the Free Software Foundation; either version 3 of the |
| 7 | * License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU Affero General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Affero General Public |
| 15 | * License along with this program. If not, see |
| 16 | * <https://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | import { Router } from 'express'; |
| 19 | import asyncHandler from 'express-async-handler'; |
| 20 | import { HttpStatusCode } from 'jami-web-common'; |
| 21 | import { getLinkPreview } from 'link-preview-js'; |
| 22 | import * as linkify from 'linkifyjs'; |
| 23 | |
| 24 | import { authenticateToken } from '../middleware/auth.js'; |
| 25 | |
| 26 | export const linkPreviewRouter = Router(); |
| 27 | |
| 28 | // Result of getLinkPreview from link-preview-js |
| 29 | type LinkPreviewJs = { |
| 30 | url: string; |
| 31 | title: string; |
| 32 | siteName: string | undefined; |
| 33 | description: string | undefined; |
| 34 | mediaType: string; |
| 35 | contentType: string | undefined; |
| 36 | images: string[]; |
| 37 | videos: { |
| 38 | url: string | undefined; |
| 39 | secureUrl: string | null | undefined; |
| 40 | type: string | null | undefined; |
| 41 | width: string | undefined; |
| 42 | height: string | undefined; |
| 43 | }[]; |
| 44 | favicons: string[]; |
| 45 | }; |
| 46 | |
| 47 | linkPreviewRouter.use(authenticateToken); |
| 48 | |
| 49 | const linkPreviewOptions = { |
| 50 | // Allowing redirection from http to https |
| 51 | // Code from doc: https://github.com/ospfranco/link-preview-js#redirections |
| 52 | followRedirects: 'manual', |
| 53 | handleRedirects: (baseURL: string, forwardedURL: string) => { |
| 54 | const urlObj = new URL(baseURL); |
| 55 | const forwardedURLObj = new URL(forwardedURL); |
| 56 | if ( |
| 57 | forwardedURLObj.hostname === urlObj.hostname || |
| 58 | forwardedURLObj.hostname === 'www.' + urlObj.hostname || |
| 59 | 'www.' + forwardedURLObj.hostname === urlObj.hostname |
| 60 | ) { |
| 61 | return true; |
| 62 | } else { |
| 63 | return false; |
| 64 | } |
| 65 | }, |
| 66 | } as const; |
| 67 | |
| 68 | linkPreviewRouter.get( |
| 69 | '/', |
| 70 | asyncHandler(async (req, res) => { |
| 71 | const url = req.query.url; |
| 72 | |
| 73 | if (typeof url !== 'string') { |
| 74 | res.status(HttpStatusCode.BadRequest).send('Invalid query parameters'); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | // Add 'http' or 'https' if absent. This is required by getLinkPreview |
| 79 | const sanitizedUrl = linkify.find(url)[0]?.href; |
| 80 | |
| 81 | if (!sanitizedUrl) { |
| 82 | res.status(HttpStatusCode.BadRequest).send('Invalid url'); |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | try { |
| 87 | const detailedLinkPreview = (await getLinkPreview(sanitizedUrl, linkPreviewOptions)) as LinkPreviewJs; |
| 88 | const linkPreview = { |
| 89 | title: detailedLinkPreview.title, |
| 90 | description: detailedLinkPreview.description, |
| 91 | // We might eventualy want to compare the images in order to select the best fit |
| 92 | // https://andrejgajdos.com/how-to-create-a-link-preview/ |
| 93 | image: detailedLinkPreview.images[0] ?? detailedLinkPreview.favicons[0], |
| 94 | }; |
| 95 | res.json(linkPreview).end(); |
| 96 | } catch (e) { |
| 97 | res.status(HttpStatusCode.NotFound).send('Could not access url'); |
| 98 | } |
| 99 | }) |
| 100 | ); |