Add additional GET endpoints to user service

What does this MR do?

Adds the following endpoints to the user service

• GET /api/userlist with the parameter 'userIdList' to return user details of a list of users.
• GET /api/search with parameter 'query' to return a list of users whose name or id begins with the query

Neither of these endpoints return password or email fields. (Ignore them in the screenshots cause i cba)

Relevant screenshots

userList

search (invalid)

search (username matches)

search (lastname matches)

Testing

• Ensure the services (user / user-mongo) are uncommented in the docker compose
• Docker compose up --build
• As screenshots

Relevant issues

(List the relevant issues, i.e. Closes #...)

backend-services/user-service/controllers/appController.js

@@ -70,7 +70,17 @@ export async function register(req,res){
 
                           // return save result as a response
                           user.save()
-                              .then(result => res.status(201).send({ msg: "User Registered Successfully"}))
+                              .then(async (result) => {
+                                const user = await UserModel.findOne({username: username})
+                                
+                                // create jwt token
+                                const token = jwt.sign({
+                                  userId: user._id,
+                                  username : user.username
+                              }, ENV.JWT_SECRET , { expiresIn : "24h"});
+
+                                res.status(201).send({ msg: "User Registered Successfully", username: user.username, token })
+                              })
                               .catch(error => res.status(500).send({error}))
 
                       }).catch(error => {
@@ -195,3 +205,49 @@ export async function updateUser(req,res){
     }
 }
 
+/**
+ * POST /userlist
+ * This DOES NOT return emails and passwords
+ * @param {*} req 
+ * @param {*} res 
+ * @returns 
+ * 
+ * body: {userIdList: []}
+ */
+export const GetUserList = async (req,res) => {
+  try {
+    const {userIdList} = req.body;
+    const users = await UserModel.find({ '_id': { $in: userIdList } }, {password: 0, email: 0});
+    return res.status(201).send({ userList: users});
+  } catch(error){
+    return res.status(401).send({ error });
+  }
+}
+
+/**
+ * GET /search
+ * This endpoint OMITS the password and email fields
+ * @param {*} req 
+ * @param {*} res 
+ * @returns 
+ * 
+ * query: {query: string}
+ */
+ export const Search = async (req,res) => {
+  try {
+    const {searchQuery} = req.query;
+
+    console.log(searchQuery)
+
+    if(searchQuery === undefined || searchQuery.length === 0){
+      throw new Error("Please provide a valid query!")
+    }
+
+    const usersWithMatchingUsername = await UserModel.find({"username": {"$regex": `^${searchQuery}`}}, {password: 0, email: 0})
+    const usersWithMatchingName = await UserModel.find({$or: [{"firstName": {"$regex": `^${searchQuery}`,"$options": 'i'}}, {"lastName": {"$regex": `^${searchQuery}`,"$options": 'i'}}]}, {password: 0, email: 0})
+    return res.status(201).send({ usersByUsername: usersWithMatchingUsername, usersByName: usersWithMatchingName});
+  } catch(error){
+    return res.status(401).send({ error: error.message });
+  }
+}
+