You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
1.7 KiB
74 lines
1.7 KiB
"use strict";
|
|
const MIMEType = require("whatwg-mimetype");
|
|
const { parseURL, serializeURL } = require("whatwg-url");
|
|
const {
|
|
stripLeadingAndTrailingASCIIWhitespace,
|
|
stringPercentDecode,
|
|
isomorphicDecode,
|
|
forgivingBase64Decode
|
|
} = require("./utils.js");
|
|
|
|
module.exports = stringInput => {
|
|
const urlRecord = parseURL(stringInput);
|
|
|
|
if (urlRecord === null) {
|
|
return null;
|
|
}
|
|
|
|
return module.exports.fromURLRecord(urlRecord);
|
|
};
|
|
|
|
module.exports.fromURLRecord = urlRecord => {
|
|
if (urlRecord.scheme !== "data") {
|
|
return null;
|
|
}
|
|
|
|
const input = serializeURL(urlRecord, true).substring("data:".length);
|
|
|
|
let position = 0;
|
|
|
|
let mimeType = "";
|
|
while (position < input.length && input[position] !== ",") {
|
|
mimeType += input[position];
|
|
++position;
|
|
}
|
|
mimeType = stripLeadingAndTrailingASCIIWhitespace(mimeType);
|
|
|
|
if (position === input.length) {
|
|
return null;
|
|
}
|
|
|
|
++position;
|
|
|
|
const encodedBody = input.substring(position);
|
|
|
|
let body = stringPercentDecode(encodedBody);
|
|
|
|
// Can't use /i regexp flag because it isn't restricted to ASCII.
|
|
const mimeTypeBase64MatchResult = /(.*); *[Bb][Aa][Ss][Ee]64$/.exec(mimeType);
|
|
if (mimeTypeBase64MatchResult) {
|
|
const stringBody = isomorphicDecode(body);
|
|
body = forgivingBase64Decode(stringBody);
|
|
|
|
if (body === null) {
|
|
return null;
|
|
}
|
|
mimeType = mimeTypeBase64MatchResult[1];
|
|
}
|
|
|
|
if (mimeType.startsWith(";")) {
|
|
mimeType = "text/plain" + mimeType;
|
|
}
|
|
|
|
let mimeTypeRecord;
|
|
try {
|
|
mimeTypeRecord = new MIMEType(mimeType);
|
|
} catch (e) {
|
|
mimeTypeRecord = new MIMEType("text/plain;charset=US-ASCII");
|
|
}
|
|
|
|
return {
|
|
mimeType: mimeTypeRecord,
|
|
body
|
|
};
|
|
};
|