feature: Auth service, Auth DB init script

Author: polevych

.gitignore

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python/src/auth/init.sql

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+CREATE USER 'auth_user'@'localhost' IDENTIFIED BY 'Auth123';
+
+CREATE DATABASE auth;
+
+GRANT ALL PRIVILEGES ON auth.* TO 'auth_user'@'localhost';
+
+USE auth;
+
+CREATE TABLE user (
+  id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  email VARCHAR(255) NOT NULL UNIQUE,
+  password VARCHAR(255) NOT NULL
+);
+
+INSERT INTO user (email, password) VALUES ('polevych@gmail.com', 'Admin123');
+
+  
+
+
+

python/src/auth/server.py

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+import jwt
+import datetime
+import os
+from flask import Flask, request
+from flask_mysqldb import MySQL
+from flask_bcrypt import Bcrypt
+
+server = Flask(__name__)
+mysql = MySQL(server)
+bcrypt = Bcrypt(server)
+
+# config
+server.config["MYSQL_HOST"] = os.environ.get("MYSQL_HOST")
+server.config["MYSQL_USER"] = os.environ.get("MYSQL_USER")
+server.config["MYSQL_PASSWORD"] = os.environ.get("MYSQL_PASSWORD")
+server.config["MYSQL_DB"] = os.environ.get("MYSQL_DB")
+server.config["MYSQL_PORT"] = int(os.environ.get("MYSQL_PORT"))
+
+@server.route("/login", methods=["POST"])
+def login():
+    auth = request.authorization
+    if not auth:
+        return "no credentials provided", 401
+    
+    # check db for username and hashed password
+    cur = mysql.connection.cursor()
+    res = cur.execute(
+        "SELECT email, password FROM user WHERE email=%s", (auth.username,)
+    )
+
+    if res > 0:
+        user_row = cur.fetchone()
+        email = user_row[0]
+        hashed_password = user_row[1]
+
+        if auth.username != email or not bcrypt.check_password_hash(hashed_password, auth.password):
+            return "invalid credentials", 401
+        else:
+            return createJWT(auth.username, os.environ.get("JWT_SECRET"), True)
+    else:
+        return "invalid credentials", 401
+
+@server.route("/validate", methods=["POST"])
+def validate():
+    encoded_jwt = request.headers.get("Authorization")
+
+    if not encoded_jwt:
+        return "missing credentials", 401
+
+    encoded_jwt = encoded_jwt.split(" ")[1]
+
+    try:
+        decoded = jwt.decode(
+            encoded_jwt, os.environ.get("JWT_SECRET"), algorithms=["HS256"]
+        )
+    except jwt.ExpiredSignatureError:
+        return "token has expired", 401
+    except jwt.InvalidTokenError:
+        return "invalid token", 401
+
+    return decoded, 200
+
+def createJWT(username, secret, authz):
+    return jwt.encode(
+        {
+            "username": username,
+            "exp": datetime.datetime.now(tz=datetime.timezone.utc)
+            + datetime.timedelta(days=1),
+            "iat": datetime.datetime.utcnow(),
+            "admin": authz,
+        },
+        secret,
+        algorithm="HS256",
+    )
+
+if __name__ == "__main__":
+    server.run(host="0.0.0.0", port=5000)