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174 lines (164 loc) · 5.08 KB
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/* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/*
* Copyright 2014 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*jslint node: true */
'use strict';
var fs = require('fs');
var crypto = require('crypto');
var http = require('http');
var https = require('https');
function downloadFile(file, url, callback, redirects) {
var completed = false;
var protocol = /^https:\/\//.test(url) ? https : http;
protocol.get(url, function (response) {
var redirectTo;
if (response.statusCode === 301 || response.statusCode === 302 ||
response.statusCode === 307 || response.statusCode === 308) {
if (redirects > 10) {
callback('Too many redirects');
}
redirectTo = response.headers.location;
redirectTo = require('url').resolve(url, redirectTo);
downloadFile(file, redirectTo, callback, (redirects || 0) + 1);
return;
}
if (response.statusCode === 404 && url.indexOf('web.archive.org') < 0) {
// trying waybackmachine
redirectTo = 'http://web.archive.org/web/' + url;
downloadFile(file, redirectTo, callback, (redirects || 0) + 1);
return;
}
if (response.statusCode !== 200) {
if (!completed) {
completed = true;
callback('HTTP ' + response.statusCode);
}
return;
}
var stream = fs.createWriteStream(file);
stream.on('error', function (err) {
if (!completed) {
completed = true;
callback(err);
}
});
response.pipe(stream);
stream.on('finish', function() {
stream.close();
if (!completed) {
completed = true;
callback();
}
});
}).on('error', function (err) {
if (!completed) {
if (typeof err === 'object' && err.errno === 'ENOTFOUND' &&
url.indexOf('web.archive.org') < 0) {
// trying waybackmachine
var redirectTo = 'http://web.archive.org/web/' + url;
downloadFile(file, redirectTo, callback, (redirects || 0) + 1);
return;
}
completed = true;
callback(err);
}
});
}
function downloadManifestFiles(manifest, callback) {
function downloadNext() {
if (i >= links.length) {
callback();
return;
}
var file = links[i].file;
var url = links[i].url;
console.log('Downloading ' + url + ' to ' + file + '...');
downloadFile(file, url, function (err) {
if (err) {
console.error('Error during downloading of ' + url + ': ' + err);
fs.writeFileSync(file, ''); // making it empty file
fs.writeFileSync(file + '.error', err);
}
i++;
downloadNext();
});
}
var links = manifest.filter(function (item) {
return item.link && !fs.existsSync(item.file);
}).map(function (item) {
var file = item.file;
var linkfile = file + '.link';
var url = fs.readFileSync(linkfile).toString();
url = url.replace(/\s+$/, '');
return {file: file, url: url};
});
var i = 0;
downloadNext();
}
function calculateMD5(file, callback) {
var hash = crypto.createHash('md5');
var stream = fs.createReadStream(file);
stream.on('data', function (data) {
hash.update(data);
});
stream.on('error', function (err) {
callback(err);
});
stream.on('end', function() {
var result = hash.digest('hex');
callback(null, result);
});
}
function verifyManifestFiles(manifest, callback) {
function verifyNext() {
if (i >= manifest.length) {
callback(error);
return;
}
var item = manifest[i];
if (fs.existsSync(item.file + '.error')) {
console.error('WARNING: File was not downloaded. See "' +
item.file + '.error" file.');
error = true;
i++;
verifyNext();
return;
}
calculateMD5(item.file, function (err, md5) {
if (err) {
console.log('WARNING: Unable to open file for reading "' + err + '".');
error = true;
} else if (!item.md5) {
console.error('WARNING: Missing md5 for file "' + item.file + '". ' +
'Hash for current file is "' + md5 + '"');
error = true;
} else if (md5 !== item.md5) {
console.error('WARNING: MD5 of file "' + item.file +
'" does not match file. Expected "' +
item.md5 + '" computed "' + md5 + '"');
error = true;
}
i++;
verifyNext();
});
}
var i = 0;
var error = false;
verifyNext();
}
exports.downloadManifestFiles = downloadManifestFiles;
exports.verifyManifestFiles = verifyManifestFiles;