Get file dropping working and wire it up to call the build repo endpoint

data/userfiles.py

@@ -4,6 +4,11 @@ import logging
 
 from boto.s3.key import Key
 from uuid import uuid4
+import hmac
+import time
+import urllib
+import base64
+import sha
 
 
 logger = logging.getLogger(__name__)
@@ -18,9 +23,25 @@ class UserRequestFiles(object):
     self._s3_conn = boto.s3.connection.S3Connection(s3_access_key,
                                                     s3_secret_key,
                                                     is_secure=False)
+    self._bucket_name = bucket_name
     self._bucket = self._s3_conn.get_bucket(bucket_name)
+    self._access_key = s3_access_key
+    self._secret_key = s3_secret_key
     self._prefix = 'userfiles'
 
+  def prepare_for_drop(self, mimeType):
+    """ Returns a signed URL to upload a file to our bucket. """
+    file_id = str(self._prefix + '/' + str(uuid4()))
+
+    expires = str(int(time.time() + 300))
+    signingString = "PUT\n\n" + mimeType + "\n" + expires + "\n/" + self._bucket_name + "/" + file_id;
+
+    hmac_signer = hmac.new(self._secret_key, signingString, sha)
+    signature = base64.b64encode(hmac_signer.digest())
+
+    url = "http://s3.amazonaws.com/" + self._bucket_name + "/" + file_id + "?AWSAccessKeyId=" + self._access_key + "&Expires=" + expires + "&Signature=" + urllib.quote(signature);
+    return (url, file_id)
+
   def store_file(self, flask_file):
     file_id = str(uuid4())
     full_key = os.path.join(self._prefix, file_id)