Add thumbnail support based on Dropbox design

Size implemented, Format still missing

attract/application/file_server.py

@@ -5,12 +5,67 @@ from flask import request
 
 from application import app
 
+from PIL import Image
 
 file_server = Blueprint('file_server', __name__,
                         template_folder='templates',
                         static_folder='static/storage')
 
 
+@file_server.route('/file/thumbnail/<file_name>')
+def thumbnail(file_name=None):
+    folder_name = file_name[:2]
+    file_folder_path = os.path.join(app.config['FILE_STORAGE'],
+                                    folder_name)
+    # The original file exists?
+    file_path = os.path.join(file_folder_path, file_name)
+    if not os.path.isfile(file_path):
+        return "", 404
+
+    format_ = "jpeg"
+    formats = ["jpeg", "png"]
+    size = "s"
+    sizes = ["xs", "s", "m", "l", "xl"]
+    size_dict= {
+        "xs": (32, 32),
+        "s": (64, 64),
+        "m": (128, 128),
+        "l": (640, 480),
+        "xl": (1024, 768)
+        }
+    if "format" in request.args:
+        if request.args['format'] in formats:
+            format_ = request.args['format']
+    if "size" in request.args:
+        if request.args['size'] in sizes:
+            size = request.args['size']
+    
+    # The Thumbnail already exist?
+    thumbnail_folder_path = os.path.join(file_folder_path, size)
+    thumbnail_file_path = os.path.join(thumbnail_folder_path, file_name)
+    if os.path.isfile(thumbnail_file_path):
+        file_static_path = os.path.join("", folder_name, size, file_name)
+        return file_server.send_static_file(file_static_path)
+
+    # Create thumbnail
+    if not os.path.exists(thumbnail_folder_path):
+        os.mkdir(thumbnail_folder_path)
+    if not os.path.isfile(thumbnail_file_path):
+        try:
+            im = Image.open(file_path)
+        except IOError:
+            return "", 500
+        im.thumbnail(size_dict[size]) 
+        try:
+            im.save(thumbnail_file_path)
+        except IOError:
+            raise
+            return "", 500
+
+        file_static_path = os.path.join("", folder_name, size, file_name)
+        return file_server.send_static_file(file_static_path)
+    return "", 500
+
 @file_server.route('/file', methods=['POST'])
 @file_server.route('/file/<file_name>')
 def index(file_name=None):
@@ -18,7 +73,6 @@ def index(file_name=None):
     if file_name:
         folder_name = file_name[:2]
         file_path = os.path.join("", folder_name, file_name)
-        print (file_path)
         return file_server.send_static_file(file_path)
     #POST file
     file_name = request.form['name']

requirements.txt

@@ -6,8 +6,10 @@ Flask-PyMongo==0.3.0
 Flask-Script==2.0.5
 Jinja2==2.7.3
 MarkupSafe==0.23
+Pillow==2.8.1
 Werkzeug==0.10.1
 argparse==1.2.1
+distribute==0.6.24
 itsdangerous==0.24
 pymongo==2.8
 requests==2.6.0