file-upload [AMAYA]

flask_file_upload_mvc/.gitignore

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+.env/
+.venv/
+env/
+.env

flask_file_upload_mvc/app.py

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+import os
+import logging
+from flask import Flask
+from extensions import db
+from config import Config
+
+app = Flask(__name__)
+app.config.from_object(Config)
+
+db.init_app(app)
+
+os.makedirs(app.config['LOG_FOLDER'], exist_ok=True)
+logging.basicConfig(
+    filename=f"{app.config['LOG_FOLDER']}/app.log",
+    level=logging.INFO,
+    format='%(asctime)s [%(levelname)s] %(message)s'
+)
+
+from controllers.file_controller import file_bp
+
+app.register_blueprint(file_bp)
+
+with app.app_context():
+    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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+import uuid
+from flask import Blueprint, request, jsonify, send_file, current_app
+from services.file_service import save_file, update_file, delete_file
+from models.uploaded_file import UploadedFile
+import logging
+
+file_bp = Blueprint('file_bp', __name__)
+
+@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
+
+
+@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
+
+        # You can test using Postman → GET http://localhost:5000/file/<id>
+        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
+
+@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
+
+@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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+2025-10-18 22:38:56,221 [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
+2025-10-18 22:38:56,222 [INFO] Press CTRL+C to quit
+2025-10-18 22:38:56,223 [INFO]  * Restarting with stat
+2025-10-18 22:38:56,879 [WARNING]  * Debugger is active!
+2025-10-18 22:38:56,881 [INFO]  * Debugger PIN: 681-091-574
+2025-10-18 22:39:11,250 [INFO] File saved: uploads/b18fc54fb8274d10a6f05da3d689dfbf\ccdf1d981d1a481ebe1e10010c00f68f_va.png
+2025-10-18 22:39:11,255 [INFO] 127.0.0.1 - - [18/Oct/2025 22:39:11] "POST /upload HTTP/1.1" 201 -
+2025-10-18 22:39:17,622 [INFO] 127.0.0.1 - - [18/Oct/2025 22:39:17] "GET /upload/1 HTTP/1.1" 404 -
+2025-10-18 22:39:38,104 [INFO] 127.0.0.1 - - [18/Oct/2025 22:39:38] "GET /file/1 HTTP/1.1" 200 -
+2025-10-18 22:40:31,093 [INFO] File updated: ID=1
+2025-10-18 22:40:31,096 [INFO] 127.0.0.1 - - [18/Oct/2025 22:40:31] "PUT /file/1 HTTP/1.1" 200 -
+2025-10-18 22:40:46,270 [INFO] 127.0.0.1 - - [18/Oct/2025 22:40:46] "GET /file/1 HTTP/1.1" 200 -
+2025-10-18 22:40:52,996 [INFO] 127.0.0.1 - - [18/Oct/2025 22:40:52] "GET /file/2 HTTP/1.1" 404 -
+2025-10-18 22:40:57,066 [ERROR] Update error: File not found
+2025-10-18 22:40:57,067 [INFO] 127.0.0.1 - - [18/Oct/2025 22:40:57] "PUT /file/2 HTTP/1.1" 400 -
+2025-10-18 22:41:00,979 [ERROR] Delete error: File not found
+2025-10-18 22:41:00,980 [INFO] 127.0.0.1 - - [18/Oct/2025 22:41:00] "DELETE /file/2 HTTP/1.1" 400 -
+2025-10-18 22:41:03,949 [INFO] File deleted from storage: uploads/b18fc54fb8274d10a6f05da3d689dfbf\f022d7b6212947b7b05f6c5603bbbcb1_731-7312556_download-png.png
+2025-10-18 22:41:03,953 [INFO] Record deleted: ID=1
+2025-10-18 22:41:03,953 [INFO] 127.0.0.1 - - [18/Oct/2025 22:41:03] "DELETE /file/1 HTTP/1.1" 200 -

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}")