Enhance Article editor 2

config/config.py

@@ -31,7 +31,15 @@ class Config:
     APP_BASE_URL = os.environ.get('APP_BASE_URL', 'http://localhost:5000')
 
     # Uploads
-    UPLOAD_FOLDER = os.environ.get('UPLOAD_FOLDER', 'app/static/uploads')
+    # UPLOAD_FOLDER must be an absolute path so that save (os.path.join) and
+    # serve (send_from_directory) always resolve to the same directory regardless
+    # of the process CWD. The default anchors to the project root via __file__.
+    _project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    _raw_upload   = os.environ.get('UPLOAD_FOLDER', '')
+    UPLOAD_FOLDER = (
+        _raw_upload if (_raw_upload and os.path.isabs(_raw_upload))
+        else os.path.join(_project_root, 'app', 'static', 'uploads')
+    )
     MAX_CONTENT_LENGTH = int(os.environ.get('MAX_CONTENT_LENGTH', 16 * 1024 * 1024))
     ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'pdf', 'doc', 'docx', 'txt', 'zip', 'log'}
 
@@ -56,4 +64,4 @@ config = {
     'development': DevelopmentConfig,
     'production': ProductionConfig,
     'default': ProductionConfig
-}
+}