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core.js
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core.js
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var fs = require('fs')
, path = require('path')
, localCache = require('./local_cache')
, storage = require('./storage')
, crypto = require('crypto')
, imageProcessor = require('./image_processor')
, async = require('async')
, util = require('util')
, moment = require('moment')
, deepExtend = require('deep-extend')
;
function md5(str){
var md5 = crypto.createHash('md5');
md5.update(str, 'utf8');
return md5.digest('hex');
}
function mkdir(dir){
if(fs.existsSync(dir)) return;
exports.mkdir(path.dirname(dir));
fs.mkdirSync(dir);
}
function loadSchema(schema){
var p = global.THUMBNAILD_HOME + '/config/schemas/' + schema + '.json';
if (!fs.existsSync(p)){
return null;
}
var result = require(p);
if (!result.id) result.id = schema;
result.isRaw = function(){
return this['parent'] == null && (!this['processors'] || this['processors'].length == 0);
};
return result;
}
var DYNAMIC_BUCKET_SPLITER = ':';
function encodeBucket(bucketId, additionalBucketInfo, key){
if (!additionalBucketInfo){
return bucketId;
}
var cipher = crypto.createCipher('aes-256-cbc',key);
var crypted = cipher.update(JSON.stringify(additionalBucketInfo),'utf8','hex');
crypted += cipher.final('hex');
return bucketId + DYNAMIC_BUCKET_SPLITER + crypted;
}
exports.encodeBucket = encodeBucket;
function loadBucket(bucketId){
var additionalBucketInfoStr = null;
if (bucketId && (bucketId.indexOf(DYNAMIC_BUCKET_SPLITER) > -1)){
additionalBucketInfoStr = bucketId.substr(bucketId.indexOf(DYNAMIC_BUCKET_SPLITER) + 1);
bucketId = bucketId.substr(0, bucketId.indexOf(DYNAMIC_BUCKET_SPLITER));
}
var p = global.THUMBNAILD_HOME + '/config/buckets/' + bucketId + '.json';
if (!fs.existsSync(p)){
return null;
}
var result = require(p);
if (additionalBucketInfoStr && additionalBucketInfoStr.length){
var decipher = crypto.createDecipher('aes-256-cbc', result['shared_secret']);
var dec = decipher.update(additionalBucketInfoStr,'hex','utf8');
dec += decipher.final('utf8');
result = deepExtend(result, JSON.parse(dec));
result.id = bucketId + '~' + md5(additionalBucketInfoStr);
}
if (!result.id) result.id = bucketId;
return result;
}
exports.loadBucket = loadBucket;
function localStorageID(objectInfo){
return md5(objectInfo.bucket + '/' + objectInfo.path);
}
function _cache(read, bucket, schema, path, newData, callback){
var localCacheType = bucket.id + '-' + schema.id;
if (bucket['cache_locally'] && schema['local_cache']){
localCache.setMaxCacheTime(localCacheType, schema['local_cache']['max_cache_time']);
localCache.setMaxCacheCount(localCacheType, schema['local_cache']['max_cache_count']);
}else{
localCache.setMaxCacheTime(localCacheType, -1);
localCache.setMaxCacheCount(localCacheType, -1);
}
var localCacheID = md5(path);
if(read){
localCache.read(localCacheType, localCacheID, function(data){
if (data){
if(callback) callback(data);
return;
}
if (bucket['cache_remotely'] && schema['remote_cache']){
var s = storage(bucket);
if(s){
var remoteCachePath = s.cachePath(schema.id, path);
if (remoteCachePath){
s.read(remoteCachePath, function(err, data){
if(callback) callback(data);
});
return;
}
}
}
if(callback) callback(null);
});
}else{
if (bucket['cache_locally'] && schema['local_cache']){
localCache.write(localCacheType, localCacheID, newData);
}
if (bucket['cache_remotely'] && schema['remote_cache']){
var s = storage(bucket);
if (s) {
var remoteCachePath = s.cachePath(schema.id, path);
if(remoteCachePath){
s.write(remoteCachePath, newData);
}
}
}
}
}
function readCache(bucket, schema, path, callback){
_cache(true, bucket, schema, path, null, callback);
}
function writeCache(bucket, schema, path, newData){
_cache(false, bucket, schema, path, newData, null);
}
var SIGNING_BASESTRING_FILE_MD5_FORMAT = "__file_%s_md5=%s";
var SIGNING_PARAM_NAME = 'sign';
exports.SIGNING_BASESTRING_FILE_MD5_FORMAT = SIGNING_BASESTRING_FILE_MD5_FORMAT;
exports.SIGNING_PARAM_NAME = SIGNING_PARAM_NAME;
function verifyHttpRequestSigning(request, secret, callback){
if (!secret || !secret.length){
callback(true);
return;
}
var exp = new RegExp('([\?\&])' + SIGNING_PARAM_NAME + '=([^\&]*)(\&|$)');
var match = request.url.match(exp);
var requestSign = match && match[2] || null;
if (!requestSign || !requestSign.length){
callback(false);
return;
}
exports.getRequestSigning({
url: request.url.replace(exp, '$1$3'), // get rid of sign=xxx
files: request.files,
body: request.body,
method: request.method
}, secret, function(err, sign){
if(err){
callback(false);
return;
}
callback(sign == requestSign);
});
}
exports.verifyHttpRequestSigning = verifyHttpRequestSigning;
function getRequestSigningBaseStringSync(request){
return exports.getRequestSigningBaseString(request, "sync");
};
exports.getRequestSigningBaseStringSync = getRequestSigningBaseStringSync;
function getRequestSigningBaseString(request, callback){
if (typeof request == 'string')
request = {url: request};
// get rid of schema and host
request.url = request.url.replace(/^[\w\-]+\:\/+[^\/]+/, '');
var urlMatch = request.url.match(/^([^\?]*)(\?)?(.*)?$/);
var queryParts = (urlMatch[3] || '').split('&');
var queries = [];
for (var i = 0; i < queryParts.length; i++) {
var kvMatch = queryParts[i].match(/([^=]*)(=)?(.*)?/);
if (kvMatch[1] && kvMatch[1].length){
var k = kvMatch[1] || "";
var v = kvMatch[3] || "";
queries.push(k + '=' + v);
}
}
var posts = [];
if (request.body){
if (typeof request.body == 'string'){
var bodyParts = request.body.split('&');
for (var i = 0; i < bodyParts.length; i++) {
var kvMatch = bodyParts[i].match(/([^=]*)(=)?(.*)?/);
if (kvMatch[1] && kvMatch[1].length){
var k = kvMatch[1] || "";
var v = kvMatch[3] || "";
posts.push(k + '=' + v);
}
}
}else{
for (var i in request.body) {
posts.push(encodeURIComponent(i) + '=' + encodeURIComponent(request.body[i]));
}
}
}
var doCallback = function(method, uri, queries, posts, files){
for(var i in files)
posts.push(files[i]);
var baseString = [method || 'GET', ' ', uri, '?', queries.sort().join('&'), "\n", posts.sort().join('&')].join('');
if (typeof callback == 'function'){
callback(null, baseString);
}
return baseString;
};
if (!request.files){
return doCallback(request.method, urlMatch[1], queries, posts, []);
}else {
var funcsForCalMd5 = []
for (var i in request.files) {
var file = request.files[i];
if (typeof file == 'string'){
funcsForCalMd5.push(function(cb){
var shasum = crypto.createHash('md5');
var s = fs.ReadStream(file);
s.on('data', function(d) { shasum.update(d); });
s.on('end', function() {
var md5 = shasum.digest('hex');
cb(null, util.format(SIGNING_BASESTRING_FILE_MD5_FORMAT, encodeURIComponent(i), encodeURIComponent(md5)));
});
});
}else if (file.path && typeof callback == 'function'){
funcsForCalMd5.push(function(cb){
var shasum = crypto.createHash('md5');
var s = fs.ReadStream(file.path);
s.on('data', function(d) { shasum.update(d); });
s.on('end', function() {
var md5 = shasum.digest('hex');
cb(null, util.format(SIGNING_BASESTRING_FILE_MD5_FORMAT, encodeURIComponent(i), encodeURIComponent(md5)));
});
});
}else if(typeof Stream != 'undefined' && file instanceof Stream && typeof callback == 'function'){
funcsForCalMd5.push(function(cb){
var shasum = crypto.createHash('md5');
file.on('data', function(d) { shasum.update(d); });
file.on('end', function() {
var md5 = shasum.digest('hex');
cb(null, util.format(SIGNING_BASESTRING_FILE_MD5_FORMAT, encodeURIComponent(i), encodeURIComponent(md5)));
});
});
}else if(file instanceof Buffer){
funcsForCalMd5.push(function(cb){
var md5 = crypto.createHash('md5').update(file).digest("hex");
cb(null, util.format(SIGNING_BASESTRING_FILE_MD5_FORMAT, encodeURIComponent(i), encodeURIComponent(md5)));
});
}else{
if (typeof callback == 'function')
callback('Illegal file', null);
return null;
}
}
var _syncResult = null;
async.parallel(funcsForCalMd5, function(error, results){
if(error){
callback(error, null);
return;
}
_syncResult = doCallback(request.method, urlMatch[1], queries, posts, results);
})
return _syncResult;
}
}
exports.getRequestSigningBaseString = getRequestSigningBaseString;
function getRequestSigning (request, secret, callback){
exports.getRequestSigningBaseString(request, function(err, baseString){
if(err){
callback(err, null);
return;
}
callback(null, secret && secret.length ? crypto.createHmac('sha1', secret).update(baseString).digest('hex') : null);
});
}
exports.getRequestSigning = getRequestSigning;
function getRequestSigningSync(request, secret){
if (!secret || !secret.length)
return null;
var baseString = exports.getRequestSigningBaseStringSync(request);
return crypto.createHmac('sha1', secret).update(baseString).digest('hex');
}
exports.getRequestSigningSync = getRequestSigningSync;
// generateThumbanilAndSaveToRemote(rawData, schema, bucket, callback)
// generateThumbnail(rawData, schema, callback)
function generateThumbnail(rawData, schema, callback){
if(!schema)
callback('schema is null', null);
if(schema.isRaw()){
callback(null, rawData);
}else if(schema['parent']){
exports.generateThumbnail(rawData, localSchema(schema['parent']), function(error, data){
if(error || !data){
callback(error ? error : 'unknown error', null);
return;
}
imageProcessor.processImage(schema['processors'], data, function(error, data){
if (error || !data){
callback('Image process error: ' + schema['parent'] + ' => ' + schema['id'] + "\n" + error, null);
return;
}
writeCache(bucket, schema, objectInfo.path, data);
callback(null, data);
});
});
}else{
callback("schema's parent not found" + schema.id, null);
}
}
exports.generateThumbnail = generateThumbnail;
// scanAndGenerateThumbnailForRemote(bucket, from, callback)
function requestThumbnaild (objectInfo, callback){
var bucket = objectInfo._bucket ? objectInfo._bucket : loadBucket(objectInfo.bucket);
if (!bucket){
callback({status: 500, message: 'Bucket not found: ' + objectInfo.bucket}, null);
return;
}
var schema = objectInfo._schema ? objectInfo._schema : loadSchema(objectInfo.schema);
if (!schema){
callback({status: 404, message: 'Schema not found: ' + objectInfo.schema}, null);
return;
}
readCache(bucket, schema, objectInfo.path, function(cachedData){
if (cachedData){
callback(null, cachedData);
return;
}
if(schema.isRaw()){
var s = storage(bucket);
if(!s){
callback({status: 500, message: 'Storage not found: ' + bucket['storage']}, null);
return;
}
s.read(objectInfo.path, function(err, data){
if(err || !data){
callback({status: 404, message: err || ('Not found: ' + objectInfo.path)}, null);
return;
}
writeCache(bucket, schema, objectInfo.path, data);
callback(null, data);
});
}else if(schema['parent']){
requestThumbnaild({
bucket: objectInfo.bucket,
_bucket: bucket,
schema: schema['parent'],
path: objectInfo.path
}, function(error, data){
if(error || !data){
callback(error ? error : {status: 404, message: 'Not found: ' + objectInfo.path + '[' + schema['parent'] + ']'}, null);
return;
}
imageProcessor.processImage(schema['processors'], data, function(error, data){
if (error || !data){
callback({status: 500, message: 'Image process error: ' + schema['parent'] + ' => ' + schema['id'] + "\n" + error}, null);
return;
}
writeCache(bucket, schema, objectInfo.path, data);
callback(null, data);
});
});
}else{
callback({status: 500, message: 'Schema parent not found: ' + objectInfo.schema}, null);
}
});
}
exports.requestThumbnaild = requestThumbnaild;
// signing
function verifySigning(req, res, next){
var bucket = loadBucket(req.params.bucket_id || req.params.bucket);
if (!bucket){
res.statusCode = 404;
res.write('Bucket id not found');
res.end();
return;
}
if (!bucket['shared_secret'] || !bucket['shared_secret'].length){
next();
return;
}
verifyHttpRequestSigning(req, bucket['shared_secret'], function(ok){
if (!ok){
if(req.app.settings.env == 'development'){
var exp = new RegExp('([\?\&])' + SIGNING_PARAM_NAME + '=([^\&]*)(\&|$)');
var request = {
url: req.url.replace(exp, '$1$3'),
method: req.method,
body: req.body,
files: req.files
};
getRequestSigningBaseString(request, function(err, baseStr){
getRequestSigning(request, bucket['shared_secret'], function(err, sign){
res.statusCode = 401;
res.set('Content-Type', 'text/html');
res.write('<h1>Signing error</h1>');
res.write('<h2>base string should be:</h2><code><pre style="background-color: #ccc;">' + baseStr + '</pre></code>');
res.write('<h2>sign string should be:</h2><code><pre style="background-color: #ccc;">' + sign + '</pre></code>');
//res.write('<h2>secret</h2><code><pre style="background-color: #ccc">' + bucket['shared_secret'] + '</pre></code>');
res.end();
});
})
return;
}
res.statusCode = 401;
res.write('signing incorrect');
res.end();
return;
}
next();
});
}
exports.verifySigning = verifySigning;
function getThumbnail(req, res){
verifySigning(req, res, function(){
var objectInfo = {
bucket: req.params.bucket_id || req.params.bucket,
schema: req.params.schema_id || req.params.schema,
path: req.params[0]
};
objectInfo._schema = loadSchema(objectInfo.schema);
requestThumbnaild(objectInfo, function(error, data){
if(error || !data){
error = error ? error : {status: 500 };
console.info(error);
res.statusCode = error.status;
res.write(error.message || 'Unknown error');
res.end();
return;
}
var age = 3600;
var expires = moment().utc().add('s', age).format('ddd, D MMM YYYY HH:mm:ss') + ' GMT';
res.set('Cache-Control', "private, max-age=" + age);
//res.sendDate = false;
res.set('Expires', expires);
res.set('Pragma', 'cache');
if(objectInfo._schema){
if(!objectInfo._schema['parent']){
// raw
var ext = path.extname(path.basename(path));
if(ext.length > 1)
ext = ext.substr(1, ext.length - 1);
if(ext.length > 0){
res.type(ext);
}
}else{
res.type('jpeg');
}
}
res.end(data);
});
});
}
exports.getThumbnail = getThumbnail;