Implement Auth

backend/routes/auth/roles.js

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+const roles = [{ uid: "admin" }, { uid: "moderator" }, { uid: "user" }];
+module.exports = roles;

backend/routes/auth/signin.js

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+const express = require("express");
+const router = express.Router();
+const defineUser = require("../../models/users");
+const { DataTypes } = require("sequelize");
+
+module.exports = function (sequelize) {
+  const User = defineUser(sequelize, DataTypes);
+
+  router.post("/auth/signin", async (req, res) => {
+    try {
+      const { email, password } = req.body;
+      const user = await User.findOne({
+        where: {
+          email: email,
+        },
+      });
+      if (!user) {
+        return res.status(401).json({ error: "Authentication failed" });
+      }
+
+      const passwordMatch = await bcrypt.compare(password, user.password);
+      if (!passwordMatch) {
+        return res.status(401).json({ error: "Authentication failed" });
+      }
+      const token = jwt.sign({ userId: user.id }, "your-secret-key", {
+        expiresIn: "1h",
+      });
+      res.status(200).json({ token });
+    } catch (error) {
+      console.error(error);
+      res.status(500).send("Sign up failed");
+    }
+  });
+
+  return router;
+};

backend/routes/auth/signup.js

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+const express = require("express");
+const router = express.Router();
+const defineUser = require("../../models/users");
+const { DataTypes } = require("sequelize");
+const roles = require("./roles");
+
+module.exports = function (sequelize) {
+  const User = defineUser(sequelize, DataTypes);
+
+  router.post("/auth/signup", async (req, res) => {
+    try {
+      const { email, password, username } = req.body;
+      const hashedPassword = await bcrypt.hash(password, 10);
+
+      const userCount = await User.count();
+      const initialRole =
+        userCount > 0
+          ? roles.findIndex((entry) => entry.uid === "user")
+          : roles.findIndex((entry) => entry.uid === "admin");
+
+      await User.create({
+        email,
+        password: hashedPassword,
+        username: username,
+        role: initialRole,
+        avatarPath: null,
+      });
+      res.status(201).json({ message: "User registered successfully" });
+    } catch (error) {
+      console.error(error);
+      res.status(500).send("Sign up failed");
+    }
+  });
+
+  return router;
+};