Very Popular
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141/** * Adapted directly from content-disposition.js at * https://github.com/Rob--W/open-in-browser/blob/master/extension/content-disposition.js * which is licensed as: * * (c) 2017 Rob Wu <rob@robwu.nl> (https://robwu.nl) * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import { toParamRegExp, unquote } from "./headers.ts";
let needsEncodingFixup = false;
function fixupEncoding(value: string): string { if (needsEncodingFixup && /[\x80-\xff]/.test(value)) { value = textDecode("utf-8", value); if (needsEncodingFixup) { value = textDecode("iso-8859-1", value); } } return value;}
const FILENAME_STAR_REGEX = toParamRegExp("filename\\*", "i");const FILENAME_START_ITER_REGEX = toParamRegExp( "filename\\*((?!0\\d)\\d+)(\\*?)", "ig",);const FILENAME_REGEX = toParamRegExp("filename", "i");
function rfc2047decode(value: string): string { if (!value.startsWith("=?") || /[\x00-\x19\x80-\xff]/.test(value)) { return value; } return value.replace( /=\?([\w-]*)\?([QqBb])\?((?:[^?]|\?(?!=))*)\?=/g, (_: string, charset: string, encoding: string, text: string) => { if (encoding === "q" || encoding === "Q") { text = text.replace(/_/g, " "); text = text.replace( /=([0-9a-fA-F]{2})/g, (_, hex) => String.fromCharCode(parseInt(hex, 16)), ); return textDecode(charset, text); } try { text = atob(text); } catch {} return textDecode(charset, text); }, );}
function rfc2231getParam(header: string): string { const matches: [string, string][] = []; let match: RegExpExecArray | null; while ((match = FILENAME_START_ITER_REGEX.exec(header))) { const [, ns, quote, part] = match; const n = parseInt(ns, 10); if (n in matches) { if (n === 0) { break; } continue; } matches[n] = [quote, part]; } const parts: string[] = []; for (let n = 0; n < matches.length; ++n) { if (!(n in matches)) { break; } let [quote, part] = matches[n]; part = unquote(part); if (quote) { part = unescape(part); if (n === 0) { part = rfc5987decode(part); } } parts.push(part); } return parts.join("");}
function rfc5987decode(value: string): string { const encodingEnd = value.indexOf(`'`); if (encodingEnd === -1) { return value; } const encoding = value.slice(0, encodingEnd); const langValue = value.slice(encodingEnd + 1); return textDecode(encoding, langValue.replace(/^[^']*'/, ""));}
function textDecode(encoding: string, value: string): string { if (encoding) { try { const decoder = new TextDecoder(encoding, { fatal: true }); const bytes = Array.from(value, (c) => c.charCodeAt(0)); if (bytes.every((code) => code <= 0xFF)) { value = decoder.decode(new Uint8Array(bytes)); needsEncodingFixup = false; } } catch {} } return value;}
export function getFilename(header: string): string { needsEncodingFixup = true;
// filename*=ext-value ("ext-value" from RFC 5987, referenced by RFC 6266). let matches = FILENAME_STAR_REGEX.exec(header); if (matches) { const [, filename] = matches; return fixupEncoding( rfc2047decode(rfc5987decode(unescape(unquote(filename)))), ); }
// Continuations (RFC 2231 section 3, referenced by RFC 5987 section 3.1). // filename*n*=part // filename*n=part const filename = rfc2231getParam(header); if (filename) { return fixupEncoding(rfc2047decode(filename)); }
// filename=value (RFC 5987, section 4.1). matches = FILENAME_REGEX.exec(header); if (matches) { const [, filename] = matches; return fixupEncoding(rfc2047decode(unquote(filename))); }
return "";}