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Viewing file:     link-preview.js (3.66 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getUrlInfo = void 0;
const messages_1 = require("./messages");
const messages_media_1 = require("./messages-media");
const THUMBNAIL_WIDTH_PX = 192;
/** Fetches an image and generates a thumbnail for it */
const getCompressedJpegThumbnail = async (url, { thumbnailWidth, fetchOpts }) => {
    const stream = await (0, messages_media_1.getHttpStream)(url, fetchOpts);
    const result = await (0, messages_media_1.extractImageThumb)(stream, thumbnailWidth);
    return result;
};
/**
 * Given a piece of text, checks for any URL present, generates link preview for the same and returns it
 * Return undefined if the fetch failed or no URL was found
 * @param text first matched URL in text
 * @returns the URL info required to generate link preview
 */
const getUrlInfo = async (text, opts = {
    thumbnailWidth: THUMBNAIL_WIDTH_PX,
    fetchOpts: { timeout: 3000 }
}) => {
    var _a;
    try {
        // retries
        const retries = 0;
        const maxRetry = 5;
        const { getLinkPreview } = await import('link-preview-js');
        let previewLink = text;
        if (!text.startsWith('https://') && !text.startsWith('http://')) {
            previewLink = 'https://' + previewLink;
        }
        const info = await getLinkPreview(previewLink, {
            ...opts.fetchOpts,
            followRedirects: 'manual',
            handleRedirects: (baseURL, forwardedURL) => {
                const urlObj = new URL(baseURL);
                const forwardedURLObj = new URL(forwardedURL);
                if (retries >= maxRetry) {
                    return false;
                }
                if (forwardedURLObj.hostname === urlObj.hostname
                    || forwardedURLObj.hostname === 'www.' + urlObj.hostname
                    || 'www.' + forwardedURLObj.hostname === urlObj.hostname) {
                    retries + 1;
                    return true;
                }
                else {
                    return false;
                }
            },
            headers: opts.fetchOpts
        });
        if (info && 'title' in info && info.title) {
            const [image] = info.images;
            const urlInfo = {
                'canonical-url': info.url,
                'matched-text': text,
                title: info.title,
                description: info.description,
                originalThumbnailUrl: image
            };
            if (opts.uploadImage) {
                const { imageMessage } = await (0, messages_1.prepareWAMessageMedia)({ image: { url: image } }, {
                    upload: opts.uploadImage,
                    mediaTypeOverride: 'thumbnail-link',
                    options: opts.fetchOpts
                });
                urlInfo.jpegThumbnail = (imageMessage === null || imageMessage === void 0 ? void 0 : imageMessage.jpegThumbnail)
                    ? Buffer.from(imageMessage.jpegThumbnail)
                    : undefined;
                urlInfo.highQualityThumbnail = imageMessage || undefined;
            }
            else {
                try {
                    urlInfo.jpegThumbnail = image
                        ? (await getCompressedJpegThumbnail(image, opts)).buffer
                        : undefined;
                }
                catch (error) {
                    (_a = opts.logger) === null || _a === void 0 ? void 0 : _a.debug({ err: error.stack, url: previewLink }, 'error in generating thumbnail');
                }
            }
            return urlInfo;
        }
    }
    catch (error) {
        if (!error.message.includes('receive a valid')) {
            throw error;
        }
    }
};
exports.getUrlInfo = getUrlInfo;