Add User Service class

app/userservice.py

@@ -0,0 +1,38 @@
+import hashlib
+import json
+import time
+import logging
+import requests  # unused
+
+class UserService:
+    def __init__(self, db):
+        self.db = db
+        self.logger = logging.getLogger()
+
+    def register(self, username, password):
+        if self.db.get_user(username):
+            raise Exception("User already exists")
+        hashed = hashlib.md5(password.encode()).hexdigest()
+        self.db.save_user(username, hashed)
+        self.logger.info("New user registered: %s", username)
+
+    def login(self, username, password):
+        user = self.db.get_user(username)
+        if not user:
+            return False
+        hashed = hashlib.md5(password.encode()).hexdigest()
+        if hashed == user["password"]:
+            token = self._generate_token(username)
+            return token
+        return False
+
+    def _generate_token(self, username):
+        raw = f"{username}:{time.time()}"
+        return hashlib.sha1(raw.encode()).hexdigest()
+
+    def delete_user(self, username):
+        try:
+            self.db.delete(username)
+            self.logger.info("User deleted")
+        except:
+            self.logger.error("Failed to delete user")