feat: create the signin method

controllers/users.js

@@ -16,11 +16,11 @@ const createUser = async (req, res) => {
   try {
     const { username, password } = req.body;
 
-    const salt =  bcrypt.genSaltSync(10);
-    const hashPassword = bcrypt.hashSync(password,salt)
+    const salt = bcrypt.genSaltSync(10);
+    const hashPassword = bcrypt.hashSync(password, salt);
 
     const newUser = await prisma.user.create({
-      data: { username, password:hashPassword },
+      data: { username, password: hashPassword },
     });
     res.status(200).json({
       message: "User has been added.",
@@ -31,6 +31,33 @@ const createUser = async (req, res) => {
   }
 };
 
+const signIn = async (req, res) => {
+  try {
+    const { username, password } = req.body;
+    const user = await prisma.user.findUnique({
+      where: {
+        username: username,
+      },
+    });
+    if (!user)
+      return res.status(404).json({
+        message: "wrong email password combination",
+      });
+    const user_password = bcrypt.compareSync(password,user.password);
+    if (!user_password)
+      return res.status(404).json({
+        message: "wrong email password combination",
+      });
+
+      res.status(200).json({
+        message: "User has been logged in.",
+        token: JWT.sign({ user: user }, process.env.SECRET_KEY),
+      });
+  } catch (error) {
+    res.status(500).json(error.message || "There was a server error.");
+  }
+};
+
 const deleteUser = async (req, res) => {
   try {
     await prisma.user.delete({
@@ -46,4 +73,4 @@ const deleteUser = async (req, res) => {
   }
 };
 
-module.exports = { getUsers, createUser, deleteUser };
+module.exports = { getUsers, createUser, deleteUser, signIn };