HTTP upload : skip if file exists

app.py

@@ -60,6 +60,7 @@ def allowed_ext(filename):
         # Split from right at first dot to find ext and allow files with "." in name
         if filename.rsplit(".",1)[-1] in media_exts:
             return True
+
 def XMLify(string, child_node_name="child"):
     '''
     '''
@@ -121,6 +122,21 @@ def thread_blink():
     th = threading.Thread(target=blink_pi, args=(16,))
     th.start()
 
+def list_media_files(folder):
+    '''
+    List files in folder which extension is allowed (exists in media_exts).
+    '''
+    if os.path.exists(folder):
+        files = os.listdir(folder);
+        medias = []
+        for fd in files:
+            if len(fd.split('.')) > 1:
+                if fd.split('.')[1] in media_exts:
+                    medias.append(fd)
+        return medias
+    else:
+        return []
+
 @app.route("/")
 @auth.login_required
 def main():
@@ -157,7 +173,6 @@ def shutdown():
 @auth.login_required
 def upload_file():
     if request.method == "POST":
-        # TODO : First check name/size of file to avoid uploading if already exists ?
         # Check if the post request has the file part
         if "file" not in request.files:
             return _("No file part: {}").format(str(request.files))
@@ -167,9 +182,15 @@ def upload_file():
         if file.filename == "":
             return _("No selected file")
         if file and allowed_ext(file.filename):
-            filename = secure_filename(file.filename)
-            file.save(os.path.join(upload_folder, filename))
-            return _("File saved in {}").format(upload_folder)
+            if debug:
+                print("Uploading file {} in {}.".format(str(file.filename, upload_folder)))
+            if file.filename not in list_media_files(upload_folder):
+                if debug:
+                    print("Existing files : {}".format(str(list_media_files(upload_folder))))
+                filename = secure_filename(file.filename)
+                file.save(os.path.join(upload_folder, filename))
+                return _("File saved in {}").format(upload_folder)
+            return "File exists, skipping..."
     return "OK"
 
 if __name__ == '__main__':

defaults.toml

@@ -1,5 +1,5 @@
 [DEFAULT]
-debug = 0
+debug = 1
 auth = "secret" 
 media_folder_local = "~/Videos"
 media_exts = ["mp4", "avi", "mkv"]