Adhiraj Singh
51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
import { WAUrlInfo } from '../Types'
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import { extractImageThumb, getHttpStream } from './messages-media'
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const THUMBNAIL_WIDTH_PX = 192
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/** Fetches an image and generates a thumbnail for it */
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const getCompressedJpegThumbnail = async(url: string, thumbnailWidth: number) => {
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const stream = await getHttpStream(url)
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const result = await extractImageThumb(stream, thumbnailWidth)
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return result
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}
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export type URLGenerationOptions = {
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thumbnailWidth: number
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}
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/**
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* Given a piece of text, checks for any URL present, generates link preview for the same and returns it
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* Return undefined if the fetch failed or no URL was found
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* @param text the text containing URL
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* @returns the URL info required to generate link preview
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*/
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export const getUrlInfo = async(
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text: string,
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opts: URLGenerationOptions = { thumbnailWidth: THUMBNAIL_WIDTH_PX }
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): Promise<WAUrlInfo | undefined> => {
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try {
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const { getLinkPreview } = await import('link-preview-js')
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const info = await getLinkPreview(text)
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if(info && 'title' in info) {
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const [image] = info.images
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const jpegThumbnail = image
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? await getCompressedJpegThumbnail(image, opts.thumbnailWidth)
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: undefined
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return {
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'canonical-url': info.url,
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'matched-text': info.url,
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title: info.title,
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description: info.description,
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jpegThumbnail
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}
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}
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} catch(error) {
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if(!error.message.includes('receive a valid')) {
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throw error
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}
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}
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} |