file-upload[CARBAJAL]

flask_file_upload_mvc/.gitignore

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+.env
+
+/uploads/

flask_file_upload_mvc/app.py

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+import os
+import logging
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from config import Config
+from extensions import db
+# Initialize Flask app
+app = Flask(__name__)
+app.config.from_object(Config)
+
+# Initialize database
+db.init_app(app)
+
+# Configure logging
+os.makedirs(app.config['LOG_FOLDER'], exist_ok=True)
+logging.basicConfig(
+    filename=os.path.join(app.config['LOG_FOLDER'], 'app.log'),
+    level=logging.INFO,
+    format='%(asctime)s [%(levelname)s] %(message)s'
+)
+
+# Register blueprints AFTER db is initialized
+with app.app_context():
+    from controllers.file_controller import file_bp
+    app.register_blueprint(file_bp)
+    db.create_all()
+
+if __name__ == '__main__':
+    app.run(debug=True)

flask_file_upload_mvc/config.py

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+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+class Config:
+    SQLALCHEMY_DATABASE_URI = (
+        f"mysql+pymysql://{os.getenv('DB_USER')}:{os.getenv('DB_PASSWORD')}@"
+        f"{os.getenv('DB_HOST')}:{os.getenv('DB_PORT')}/{os.getenv('DB_NAME')}"
+    )
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    UPLOAD_FOLDER = os.getenv('UPLOAD_FOLDER', 'uploads')
+    LOG_FOLDER = 'logs'
+    DEBUG = True

flask_file_upload_mvc/controllers/file_controller.py

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+from flask import Blueprint, current_app, request, jsonify, send_file
+from services.file_service import save_file, update_file, delete_file
+from models.uploaded_file import UploadedFile
+import uuid
+import logging
+
+file_bp = Blueprint('file_bp', __name__)
+
+# POST - Upload file
+@file_bp.route('/upload', methods=['POST'])
+def upload_file():
+    try:
+        if 'file' not in request.files:
+            return jsonify({'message': 'No file uploaded'}), 400
+
+        file = request.files['file']
+        folder = f"{current_app.config['UPLOAD_FOLDER']}/{uuid.uuid4().hex}"  # new folder per request
+        uploaded = save_file(file, folder)
+
+        return jsonify({
+            'message': 'Upload successful',
+            'id': uploaded.id,
+            'path': uploaded.file_path
+        }), 201
+    except Exception as e:
+        logging.error(f"Upload error: {e}")
+        return jsonify({'message': str(e)}), 400
+
+# GET - Retrieve file info or download
+@file_bp.route('/file/<int:file_id>', methods=['GET'])
+def get_file(file_id):
+    try:
+        file = UploadedFile.query.get(file_id)
+        if not file:
+            return jsonify({'message': 'File not found'}), 404
+
+        return send_file(file.file_path, as_attachment=True)
+    except Exception as e:
+        logging.error(f"Get error: {e}")
+        return jsonify({'message': str(e)}), 400
+
+# PUT - Update file
+@file_bp.route('/file/<int:file_id>', methods=['PUT'])
+def update_existing_file(file_id):
+    try:
+        if 'file' not in request.files:
+            return jsonify({'message': 'No file provided'}), 400
+
+        file = request.files['file']
+        updated = update_file(file_id, file, current_app.config['UPLOAD_FOLDER'])
+
+        return jsonify({
+            'message': 'File updated successfully',
+            'path': updated.file_path
+        }), 200
+    except Exception as e:
+        logging.error(f"Update error: {e}")
+        return jsonify({'message': str(e)}), 400
+
+# DELETE - Delete file
+@file_bp.route('/file/<int:file_id>', methods=['DELETE'])
+def delete_existing_file(file_id):
+    try:
+        delete_file(file_id)
+        return jsonify({'message': 'File deleted successfully'}), 200
+    except Exception as e:
+        logging.error(f"Delete error: {e}")
+        return jsonify({'message': str(e)}), 400

flask_file_upload_mvc/extensions.py

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+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()

flask_file_upload_mvc/logs/app.log

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+2025-10-19 19:02:36,047 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:02:36,047 [INFO] Press CTRL+C to quit
+2025-10-19 19:02:36,048 [INFO]  * Restarting with stat
+2025-10-19 19:02:36,529 [WARNING]  * Debugger is active!
+2025-10-19 19:02:36,531 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:04:04,348 [INFO] 127.0.0.1 - - [19/Oct/2025 19:04:04] "GET /upload HTTP/1.1" 405 -
+2025-10-19 19:05:01,747 [ERROR] Upload error: module 'flask.app' has no attribute 'config'
+2025-10-19 19:05:01,748 [INFO] 127.0.0.1 - - [19/Oct/2025 19:05:01] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:06:16,772 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\controllers\\file_controller.py', reloading
+2025-10-19 19:06:16,860 [INFO]  * Restarting with stat
+2025-10-19 19:06:17,438 [WARNING]  * Debugger is active!
+2025-10-19 19:06:17,440 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:06:35,549 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\controllers\\file_controller.py', reloading
+2025-10-19 19:06:35,646 [INFO]  * Restarting with stat
+2025-10-19 19:06:36,148 [WARNING]  * Debugger is active!
+2025-10-19 19:06:36,150 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:06:49,020 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:06:49,020 [INFO] Press CTRL+C to quit
+2025-10-19 19:06:49,021 [INFO]  * Restarting with stat
+2025-10-19 19:06:49,493 [WARNING]  * Debugger is active!
+2025-10-19 19:06:49,495 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:06:52,723 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:06:52,723 [INFO] 127.0.0.1 - - [19/Oct/2025 19:06:52] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:06:53,605 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:06:53,605 [INFO] 127.0.0.1 - - [19/Oct/2025 19:06:53] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:07:21,219 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:07:21,219 [INFO] 127.0.0.1 - - [19/Oct/2025 19:07:21] "POST /upload?file= HTTP/1.1" 400 -
+2025-10-19 19:08:09,972 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\models\\uploaded_file.py', reloading
+2025-10-19 19:08:10,064 [INFO]  * Restarting with stat
+2025-10-19 19:09:10,245 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:09:10,245 [INFO] Press CTRL+C to quit
+2025-10-19 19:09:10,246 [INFO]  * Restarting with stat
+2025-10-19 19:09:10,722 [WARNING]  * Debugger is active!
+2025-10-19 19:09:10,723 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:09:28,337 [INFO] 127.0.0.1 - - [19/Oct/2025 19:09:28] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:09:35,428 [INFO] 127.0.0.1 - - [19/Oct/2025 19:09:35] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:12,434 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\controllers\\file_controller.py', reloading
+2025-10-19 19:11:12,529 [INFO]  * Restarting with stat
+2025-10-19 19:11:13,076 [WARNING]  * Debugger is active!
+2025-10-19 19:11:13,078 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:11:23,462 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:11:23,463 [INFO] Press CTRL+C to quit
+2025-10-19 19:11:23,464 [INFO]  * Restarting with stat
+2025-10-19 19:11:23,998 [WARNING]  * Debugger is active!
+2025-10-19 19:11:24,000 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:11:37,529 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:37] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:54,450 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:54] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:55,229 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:55] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:55,687 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:55] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:56,070 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:56] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:11:56,387 [INFO] 127.0.0.1 - - [19/Oct/2025 19:11:56] "POST /upload HTTP/1.1" 400 -
+2025-10-19 19:14:45,256 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:14:45,256 [INFO] 127.0.0.1 - - [19/Oct/2025 19:14:45] "POST /upload?file= HTTP/1.1" 400 -
+2025-10-19 19:15:28,149 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:15:28,149 [INFO] Press CTRL+C to quit
+2025-10-19 19:15:28,150 [INFO]  * Restarting with stat
+2025-10-19 19:15:28,681 [WARNING]  * Debugger is active!
+2025-10-19 19:15:28,683 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:15:44,421 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:15:44,422 [INFO] 127.0.0.1 - - [19/Oct/2025 19:15:44] "POST /upload?file HTTP/1.1" 400 -
+2025-10-19 19:17:26,379 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\app.py', reloading
+2025-10-19 19:17:26,464 [INFO]  * Restarting with stat
+2025-10-19 19:17:27,076 [WARNING]  * Debugger is active!
+2025-10-19 19:17:27,078 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:17:34,140 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\app.py', reloading
+2025-10-19 19:17:34,236 [INFO]  * Restarting with stat
+2025-10-19 19:17:38,566 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:17:38,566 [INFO] Press CTRL+C to quit
+2025-10-19 19:17:38,567 [INFO]  * Restarting with stat
+2025-10-19 19:17:39,047 [WARNING]  * Debugger is active!
+2025-10-19 19:17:39,049 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:17:54,080 [ERROR] Upload error: The current Flask app is not registered with this 'SQLAlchemy' instance. Did you forget to call 'init_app', or did you create multiple 'SQLAlchemy' instances?
+2025-10-19 19:17:54,081 [INFO] 127.0.0.1 - - [19/Oct/2025 19:17:54] "POST /upload?file HTTP/1.1" 400 -
+2025-10-19 19:18:59,550 [INFO]  * Detected change in 'C:\\Users\\jac23\\Desktop\\FileUploadFlask\\file-upload\\flask_file_upload_mvc\\app.py', reloading
+2025-10-19 19:18:59,666 [INFO]  * Restarting with stat
+2025-10-19 19:19:07,180 [INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on http://127.0.0.1:5000
+2025-10-19 19:19:07,181 [INFO] Press CTRL+C to quit
+2025-10-19 19:19:07,181 [INFO]  * Restarting with stat
+2025-10-19 19:19:07,770 [WARNING]  * Debugger is active!
+2025-10-19 19:19:07,772 [INFO]  * Debugger PIN: 134-261-731
+2025-10-19 19:19:26,790 [INFO] File saved: uploads/c543263cbc4e4783944f6fad9d2b2596\01f55afa347545b4b564e5be8d596494_Screenshot_2025-10-03_223338.png
+2025-10-19 19:19:26,794 [INFO] 127.0.0.1 - - [19/Oct/2025 19:19:26] "POST /upload?file HTTP/1.1" 201 -

flask_file_upload_mvc/models/uploaded_file.py

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+from extensions import db
+
+class UploadedFile(db.Model):
+    id = db.Column(db.Integer, primary_key = True)
+    filename = db.Column(db.String(255), nullable = False)
+    file_path = db.Column(db.String(255), nullable = False)

flask_file_upload_mvc/services/file_service.py

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+import os
+import uuid
+from werkzeug.utils import secure_filename
+from models.uploaded_file import UploadedFile
+from models.uploaded_file import db
+import logging
+
+ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'pdf', 'txt'}
+
+def allowed_file(filename):
+    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
+
+def save_file(file, base_folder):
+    if not allowed_file(file.filename):
+        raise ValueError('File type not allowed')
+
+    os.makedirs(base_folder, exist_ok=True)
+    filename = secure_filename(file.filename)
+    unique_name = f"{uuid.uuid4().hex}_{filename}"
+    save_path = os.path.join(base_folder, unique_name)
+    file.save(save_path)
+
+    new_file = UploadedFile(filename=unique_name, file_path=save_path)
+    db.session.add(new_file)
+    db.session.commit()
+
+    logging.info(f"File saved: {save_path}")
+    return new_file
+
+# Update service reuse the existing folder and remove the bug where after updating it gets added again in the database
+def update_file(file_id, new_file, _):
+    existing = UploadedFile.query.get(file_id)
+    if not existing:
+        raise ValueError('File not found')
+
+    if os.path.exists(existing.file_path):
+        os.remove(existing.file_path)
+
+    existing_folder = os.path.dirname(existing.file_path)  
+    os.makedirs(existing_folder, exist_ok=True)  
+    filename = secure_filename(new_file.filename)
+    unique_name = f"{uuid.uuid4().hex}_{filename}"
+    save_path = os.path.join(existing_folder, unique_name)  
+
+    new_file.save(save_path)
+
+    existing.filename = unique_name
+    existing.file_path = save_path
+    db.session.commit()
+
+    logging.info(f"File updated: ID={file_id}")
+    return existing
+
+
+def delete_file(file_id):
+    file_record = UploadedFile.query.get(file_id)
+    if not file_record:
+        raise ValueError('File not found')
+    if os.path.exists(file_record.file_path):
+        os.remove(file_record.file_path)
+        logging.info(f"File deleted from storage: {file_record.file_path}")
+
+    db.session.delete(file_record)
+    db.session.commit()
+    logging.info(f"Record deleted: ID={file_id}")