37 lines
1.3 KiB
JavaScript
37 lines
1.3 KiB
JavaScript
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// @ts-check
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const assert = require("assert")
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const fetch = require("node-fetch").default
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const utils = require("../converters/utils")
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const {sync} = require("../../passthrough")
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/** @type {import("../converters/emoji-sheet")} */
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const emojiSheetConverter = sync.require("../converters/emoji-sheet")
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/**
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* Downloads the emoji from the web and converts to uncompressed PNG data.
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* @param {string} mxc a single mxc:// URL
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* @returns {Promise<Buffer | undefined>} uncompressed PNG data, or undefined if the downloaded emoji is not valid
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*/
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async function getAndConvertEmoji(mxc) {
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const abortController = new AbortController()
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const url = utils.getPublicUrlForMxc(mxc)
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assert(url)
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/** @type {import("node-fetch").Response} */
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// If it turns out to be a GIF, we want to abandon the connection without downloading the whole thing.
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// If we were using connection pooling, we would be forced to download the entire GIF.
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// So we set no agent to ensure we are not connection pooling.
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// @ts-ignore the signal is slightly different from the type it wants (still works fine)
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const res = await fetch(url, {agent: false, signal: abortController.signal})
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return emojiSheetConverter.convertImageStream(res.body, () => {
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abortController.abort()
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res.body.pause()
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res.body.emit("end")
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})
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}
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module.exports.getAndConvertEmoji = getAndConvertEmoji
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