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    <p>I had to tackle a similar problem (uploading single photo from Flex to Django) while working on captionmash.com, maybe it can help you. I was using PyAMF for normal messaging but FileReference class had a built in upload method, so I chose the easy way.</p> <p>Basically system allows you to upload a single file from Flex to Google App Engine, then it uses App Engine's Image API to create thumbnail and also convert image to JPEG, then upload it to S3 bucket. <a href="http://code.google.com/p/boto/" rel="nofollow">boto</a> library is used for Amazon S3 connection, you can view the whole code of the project <a href="https://github.com/ocanbascil/captionmash" rel="nofollow">here</a> on github.</p> <p>This code is for single file upload only, but you should be able to do multi-file uploads by creating an array of FileReference objects and calling upload method on all of them.</p> <p>The code I'm posting here is a bit cleaned up, if you still have problems you should check the repo out.</p> <p>Client Side (Flex):</p> <pre><code> private function upload(fileReference:FileReference, album_id:int, user_id:int):void{ try { //500 kb image size if(fileReference.size &gt; ApplicationConstants.IMAGE_SIZE_LIMIT){ trace("File too big"+fileReference.size); return; } fileReference.addEventListener(Event.COMPLETE,onComplete); var data:URLVariables = new URLVariables(); var request:URLRequest = new URLRequest(ApplicationConstants.DJANGO_UPLOAD_URL); request.method = URLRequestMethod.POST; request.data = data; fileReference.upload(request,"file"); //Popup indefinite progress bar } catch (err:Error) { trace("ERROR: zero-byte file"); } } //When upload complete private function onComplete(evt:Event):void{ fileReference.removeEventListener(Event.COMPLETE,onComplete); //Do other stuff (remove progress bar etc) } </code></pre> <p>Server side (Django on App Engine):</p> <p>Urls:</p> <pre><code>urlpatterns = patterns('', ... (r'^upload/$', receive_file), ... </code></pre> <p>Views:</p> <pre><code>def receive_file(request): uploadService = UploadService() file = request.FILES['file'] uploadService.receive_single_file(file) return HttpResponse() </code></pre> <p>UploadService class</p> <pre><code>import uuid from google.appengine.api import images from boto.s3.connection import S3Connection from boto.s3.key import Key import mimetypes import settings def receive_single_file(self,file): uuid_name = str(uuid.uuid4()) content = file.read() image_jpeg = self.create_jpeg(content) self.store_in_s3(uuid_name, image_jpeg) thumbnail = self.create_thumbnail(content) self.store_in_s3('tn_'+uuid_name, thumbnail) #Convert image to JPEG (also reduce size) def create_jpeg(self,content): img = images.Image(content) img_jpeg = images.resize(content,img.width,img.height,images.JPEG) return img_jpeg #Create thumbnail image using file def create_thumbnail(self,content): image = images.resize(content,THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT,images.JPEG) return image def store_in_s3(self,filename,content): conn = S3Connection(settings.ACCESS_KEY, settings.PASS_KEY) b = conn.get_bucket(BUCKET_NAME) mime = mimetypes.guess_type(filename)[0] k = Key(b) k.key = filename k.set_metadata("Content-Type", mime) k.set_contents_from_string(content) k.set_acl("public-read") </code></pre>
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