39 lines
1.6 KiB
JavaScript
39 lines
1.6 KiB
JavaScript
'use strict';
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const assert = require('./assert');
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// Based off of https://github.com/matrix-org/matrix-bifrost/blob/c7161dd998c4fe968dba4d5da668dc914248f260/src/MessageFormatter.ts#L45-L60
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function mxcUrlToHttp({ mxcUrl, homeserverUrl }) {
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assert(mxcUrl, '`mxcUrl` must be provided to `mxcUrlToHttp(...)`');
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assert(homeserverUrl, '`homeserverUrl` must be provided to `mxcUrlToHttp(...)`');
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const [serverName, mediaId] = mxcUrl.substr('mxc://'.length).split('/', 2);
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const url = homeserverUrl.replace(/\/$/, '');
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return `${url}/_matrix/media/v1/download/${encodeURIComponent(serverName)}/${encodeURIComponent(
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mediaId
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)}`;
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}
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const ALLOWED_RESIZE_METHODS = ['scale', 'crop'];
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function mxcUrlToHttpThumbnail({ mxcUrl, homeserverUrl, size, resizeMethod = 'scale' }) {
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assert(mxcUrl, '`mxcUrl` must be provided to `mxcUrlToHttp(...)`');
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assert(homeserverUrl, '`homeserverUrl` must be provided to `mxcUrlToHttp(...)`');
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assert(size, '`size` must be provided to `mxcUrlToHttp(...)`');
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assert(
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ALLOWED_RESIZE_METHODS.includes(resizeMethod),
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`\`resizeMethod\` must be ${JSON.stringify(ALLOWED_RESIZE_METHODS)}`
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);
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const [serverName, mediaId] = mxcUrl.substr('mxc://'.length).split('/');
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let qs = new URLSearchParams();
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qs.append('width', Math.round(size));
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qs.append('height', Math.round(size));
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qs.append('method', resizeMethod);
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const url = homeserverUrl.replace(/\/$/, '');
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return `${url}/_matrix/media/r0/thumbnail/${encodeURIComponent(serverName)}/${encodeURIComponent(
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mediaId
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)}?${qs.toString()}`;
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}
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module.exports = { mxcUrlToHttp, mxcUrlToHttpThumbnail };
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