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imager.js
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imager.js
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var formidable = require('formidable')
, util = require('util')
, im = require('imagemagick')
, fs = require('fs')
, path = require('path')
, mime = require('mime')
, cloudfiles = require('cloudfiles')
var config_file = '../imager-example.json'
, config = {}
, client = undefined
, container = undefined
, uploaddir = undefined
, storage_type = undefined
, scope = undefined
, cdnUri = undefined
, uploadedFiles = []
var Imager = exports = module.exports = function Imager(options) {
config_file = (typeof options['config_file'] === 'undefined') ? config_file : options['config_file']
storage_type = options['storage']
this.loadConfig(config_file)
this.localFiles = false
// throw an error if the rackspace auth settings are not defined
if ( typeof (config['storage']['rs']) == 'undefined' )
throw new TypeError("No storage defined in Imager config")
for(storage in config['storage']) {
this[storage + 'Setup'](config['storage'][storage])
}
}
Imager.prototype = {
url: function(file, version, callback) {
var _file = this.genFileName( file, version )
return this[storage_type + 'Url'](_file, callback)
}
, rsUrl: function(file, callback) {
// authenticate your rackspace account
client.setAuth(function() {
// get the container
client.getContainer(container, true, function (err, c) {
// if there is any error, pass the error to the callback
if (err) callback(err)
// pass the url to the callback
callback(null, c.cdnUri+'/'+file)
})
})
}
, genFileName: function(file, version) {
return version + '_' + file
}
, remove: function(files, callback, _scope) {
scope = (arguments.length == 3) ? _scope : undefined
var self = this
if (typeof(files) === 'string') {
// remove the single file
removeVariants(files)
}
else if (Array.isArray(files)) {
// remove all the files in the given array
try {
files.forEach(function (file) {
removeVariants(file)
})
}
catch (e) {
callback(e)
}
}
else {
// throw an error
callback(new Error('You should pass a single file or an array of files'))
}
function removeVariants (file) {
var _variants = self.setupVariants()
, _resize = _variants['resize']
, _crop = _variants['crop']
// remove each variant specified in the resize settings
for(version in _resize) {
self[storage_type + 'Remove']( self.genFileName( file, version ), function(err) {
if (err) throw err
})
}
// remove each variant specified in the crop settings
for(version in _crop) {
self[storage_type + 'Remove']( self.genFileName( file, version ), function(err) {
if(err) throw err
})
}
}
callback(null)
}
, rsRemove: function(file) {
// authenticate your rackspace account
client.setAuth(function() {
// get the container
client.getContainer(container, true, function (err, c) {
// remove the file from container
c.removeFile(file, function(err, res){
if (err) throw err
console.log('removed')
// callback(err)
})
})
})
}
, upload: function(req, res, callback, _scope) {
var _this = this
, files = []
// allow passing of a single file OR an array of files
if (typeof req === 'string' || Array.isArray(req)) {
this.localFiles = true
_scope = callback
callback = res
scope = (arguments.length == 3) ? _scope : undefined
// create the files array.
files = typeof req === 'string' ? req.split() : req
parsedForm(files)
}
else {
scope = (arguments.length == 4) ? _scope : undefined
var _this = this
, form = new formidable.IncomingForm()
, files = []
, new_file = undefined
if (req.files == undefined) {
// parse the form if it isn't parsed yet
form.parse(req, function (err, fields, files) {
parsedForm(files)
})
}
else {
// send the files for processing
parsedForm(req.files)
}
}
function parsedForm (files) {
var keys = Object.keys(files)
, k = keys.shift()
// if files are uploaded with multiple attr
if (Array.isArray(files[k])) {
files = files[k]
keys = Object.keys(files)
k = keys.shift()
}
processImage(files[k])
function processImage(file) {
if (file.name != '' || this.localFiles) {
_this.makeVariants(file, function(err, file){
var key = keys.shift()
if (typeof key != 'undefined')
processImage(files[key])
else {
callback(err, uploadedFiles, cdnUri, res)
uploadedFiles = []
}
})
}
else {
var key = keys.shift()
if (typeof key != 'undefined')
processImage(files[key])
else {
callback(null, uploadedFiles, cdnUri, res)
uploadedFiles = []
}
}
}
}
}
, rsSetup: function(options) {
client = cloudfiles.createClient(options)
container = options.container
}
, makeVariants: function(file, callback) {
var _this = this
, _variants = this.setupVariants()
, _resize = _variants["resize"] || JSON.parse( JSON.stringify({"null" : "null"}) )
, _crop = _variants["crop"] || JSON.parse( JSON.stringify({"null" : "null"}) )
, new_file = Math.round(new Date().getTime())
, type = this.localFiles ? mime.lookup(file) : file['type']
, filePath = this.localFiles ? file : file['path']
, ext = this.setExtension(type)
new_file += ext
uploadedFiles.push(new_file)
if (Object.keys(_resize).length == 0 && Object.keys(_crop).length == 0)
throw new Error("No variants specified in the config file")
else if (Object.keys(_resize).length > 0 && Object.keys(_crop).length > 0) {
resizeImage(function () {
cropImage()
})
}
else if (Object.keys(_resize).length > 0 && Object.keys(_crop).length == 0)
resizeImage()
else
cropImage()
function resizeImage(cb) {
var i = 0
if (Object.keys(_resize).length > 0) {
for(prefix in _resize) {
_this.imAction('im.resize', file, _this.genFileName( new_file, prefix ) , _resize[prefix], function(err){
i++
if (i == Object.keys(_resize).length && Object.keys(_crop).length == 0)
callback(err, new_file)
else if (i == Object.keys(_resize).length && Object.keys(_crop).length > 0)
cb()
})
}
}
}
function cropImage(cb) {
var i = 0
if (Object.keys(_crop).length > 0) {
for(prefix in _crop) {
_this.imAction('im.crop', file, _this.genFileName( new_file, prefix ) , _crop[prefix], function(err){
i++
if (i == Object.keys(_crop).length ) {
// fs.unlink(path)
callback(err, new_file)
}
})
}
}
}
}
, setupVariants: function() {
var resize = (typeof scope === 'undefined') ? config.variants.resize : config.variants[scope].resize
, crop = (typeof scope === 'undefined') ? config.variants.crop : config.variants[scope].crop
return { "resize" : resize, "crop" : crop }
}
, pushToRS: function(sfile, dfile, content_type, callback) {
fs.readFile(sfile, function(err, buf){
client.setAuth(function() {
client.getContainer(container, true, addFileToContainer)
})
function addFileToContainer(err, c) {
if (err) callback(err)
var options = {
remote: dfile
, headers: {
'Content-Type': content_type
, 'Content-Length': buf.length
}
, local: sfile }
cdnUri = c.cdnUri
client.addFile(container, options, onUploadToContainer)
}
function onUploadToContainer(err, uploaded) {
if (err) callback(err)
if (uploaded) {
callback(err) //fs.unlink(sfile)
}
}
})
}
, loadConfig: function(resource) {
if (path.existsSync(resource)) {
try {
config = JSON.parse(fs.readFileSync(resource))
} catch (err) {
throw new Error("Could not parse JSON config at "+path.resolve(resource))
}
}
}
, imAction: function(action, file, prefix, size, callback) {
if (size == "null") {
return callback(null)
}
var _this = this
, dfile = prefix
, filePath = this.localFiles ? file : file['path']
, type = this.localFiles ? mime.lookup(file) : file['type']
, tfile = (storage_type == 'dir') ? uploaddir + dfile : filePath + prefix
eval(action)( this.imOptions(file, tfile, size), function(err, stdout, stderr){
if (storage_type == 'rs') {
_this.pushToRS(tfile, dfile, type, function(err){
return callback(err)
})
}
else
return callback(err)
})
}
, setExtension: function(content_type) {
switch(content_type) {
case 'image/jpeg':
var ext = '.jpg'
break
case 'image/png':
var ext = '.png'
break
case 'image/gif':
var ext = '.gif'
break
}
return ext
}
, imOptions: function(file, tfile, size) {
var _size = size.split('x')
, filePath = this.localFiles ? file : file['path']
return options = {
srcPath: filePath,
dstPath: tfile,
width: _size[0],
height: _size[1],
quality: 1
}
}
}