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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
*
* Copyright (C) 2018 Giorgio Maone <giorgio@maone.net>
*
* This file is part of GNU LibreJS.
*
* GNU LibreJS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNU LibreJS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU LibreJS. If not, see <http://www.gnu.org/licenses/>.
*/
/**
This class parses HTTP response headers to extract both the
MIME Content-type and the character set to be used, if specified,
to parse textual data through a decoder.
*/
class ResponseMetaData {
constructor(request) {
let {responseHeaders} = request;
this.headers = {};
for (let h of responseHeaders) {
if (/^\s*Content-(Type|Disposition)\s*$/i.test(h.name)) {
let propertyName = h.name.split("-")[1].trim();
propertyName = `content${propertyName.charAt(0).toUpperCase()}${propertyName.substring(1).toLowerCase()}`;
this[propertyName] = h.value;
this.headers[propertyName] = h;
}
}
this.forcedUTF8 = false;
}
get charset() {
let charset = "";
if (this.contentType) {
let m = this.contentType.match(/;\s*charset\s*=\s*(\S+)/);
if (m) {
charset = m[1];
}
}
Object.defineProperty(this, "charset", { value: charset, writable: false, configurable: true });
return charset;
}
get isUTF8() {
return /^utf-?8$/i.test(this.charset);
}
forceUTF8() {
if (!(this.forcedUTF8 || this.isUTF8)) {
let h = this.headers.contentType;
if (h) {
h.value = h.value.replace(/;\s*charset\s*=.*|$/, "; charset=utf8");
this.forcedUTF8 = true;
} // if the header doesn't exist the browser should default to UTF-8 anyway
}
return this.forcedUTF8;
}
createDecoder() {
if (this.charset) {
try {
return new TextDecoder(this.charset);
} catch (e) {
console.error(e);
}
}
return new TextDecoder("utf-8");
}
};
module.exports = { ResponseMetaData };
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