69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
"use strict";
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const MIMEType = require("whatwg-mimetype");
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const { parseURL, serializeURL, percentDecodeString } = require("whatwg-url");
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const { stripLeadingAndTrailingASCIIWhitespace, isomorphicDecode, forgivingBase64Decode } = require("./utils.js");
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module.exports = stringInput => {
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const urlRecord = parseURL(stringInput);
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if (urlRecord === null) {
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return null;
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}
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return module.exports.fromURLRecord(urlRecord);
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};
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module.exports.fromURLRecord = urlRecord => {
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if (urlRecord.scheme !== "data") {
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return null;
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}
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const input = serializeURL(urlRecord, true).substring("data:".length);
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let position = 0;
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let mimeType = "";
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while (position < input.length && input[position] !== ",") {
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mimeType += input[position];
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++position;
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}
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mimeType = stripLeadingAndTrailingASCIIWhitespace(mimeType);
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if (position === input.length) {
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return null;
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}
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++position;
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const encodedBody = input.substring(position);
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let body = percentDecodeString(encodedBody);
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// Can't use /i regexp flag because it isn't restricted to ASCII.
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const mimeTypeBase64MatchResult = /(.*); *[Bb][Aa][Ss][Ee]64$/u.exec(mimeType);
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if (mimeTypeBase64MatchResult) {
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const stringBody = isomorphicDecode(body);
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body = forgivingBase64Decode(stringBody);
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if (body === null) {
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return null;
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}
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mimeType = mimeTypeBase64MatchResult[1];
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}
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if (mimeType.startsWith(";")) {
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mimeType = `text/plain${mimeType}`;
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}
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let mimeTypeRecord;
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try {
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mimeTypeRecord = new MIMEType(mimeType);
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} catch (e) {
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mimeTypeRecord = new MIMEType("text/plain;charset=US-ASCII");
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}
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return {
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mimeType: mimeTypeRecord,
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body
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};
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};
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