server/index.js

@@ -68,6 +68,7 @@ app.use('/kazan-explore', require('./routers/kazan-explore'))
 app.use('/epja-2023-2', require('./routers/epja-2023-2'))
 require('./routers/hub-video')
 app.use('/school-stage', require('./routers/school-stage'))
+app.use('/epja-2024-1', require('/routers/epja-2024-1'))
 
 app.use(require('./error'))
 

server/routers/epja-2024-1/enterfront/auth/index.js

@@ -0,0 +1,73 @@
+const authRouter = require('express').Router();
+
+// For creating tokens
+const jwt = require('jsonwebtoken');
+
+const { TOKEN_KEY } = require('../key')
+
+
+module.exports = authRouter;
+
+const { addUserToDB, getUserFromDB } = require('../db');
+
+
+// Get a user by its id
+authRouter.get('/:id', (req, res) => {
+    const user = getUserFromDB(req.params.id);
+
+    if (user) {
+        res.status(200).send({user});
+    } else {
+        res.status(404).send({message: 'User was not found'});
+    }
+})
+
+// For login (authorization)
+authRouter.post('/login', (req, res) => {
+    const { name, password } = req.body;
+
+    const user = getUserFromDB(name);
+
+    // Invalid identification
+    if (!user) {
+        res.status(401).send({message: 'Invalid credentials (id)'});
+        return;
+    }
+
+    // Invalid authentication
+    if (!password || password !== user.password) {
+        res.status(401).send({message: 'Invalid credentials (password)'});
+        return;
+    }
+
+    // Now, authorization
+    const token = jwt.sign({id: name}, TOKEN_KEY, {
+        expiresIn: '1h'
+    })
+
+    res.status(200).send({token});
+})
+
+
+authRouter.post('/reg', (req, res) => {
+    const { name, password, nickname } = req.body;
+
+    const user = getUserFromDB(name);
+
+    // Invalid identification
+    if (user) {
+        res.status(409).send({message: 'Such id already exists'});
+        return;
+    }
+
+    if (!name || !password || !nickname) {
+        res.status(401).send({message: 'Empty or invalid fields'});
+        return;
+    }
+
+    // Add to 'DB'
+    const newUser = {id: name, password: password, nickname: nickname};
+    addUserToDB(newUser)
+
+    res.status(200).send({user: newUser});
+})

server/routers/epja-2024-1/enterfront/auth/users.json

@@ -0,0 +1,52 @@
+[
+  {
+    "nickname": "Alice Johnson",
+    "password": "1234",
+    "id": "alice"
+  },
+  {
+    "nickname": "Bob Smith",
+    "password": "1234",
+    "id": "bobsm"
+  },
+  {
+    "nickname": "Charlie Brown",
+    "password": "1234",
+    "id": "charl"
+  },
+  {
+    "nickname": "David Clark",
+    "password": "1234",
+    "id": "david"
+  },
+  {
+    "nickname": "Eve Adams",
+    "password": "1234",
+    "id": "evead"
+  },
+  {
+    "nickname": "Frank Wright",
+    "password": "1234",
+    "id": "frank"
+  },
+  {
+    "nickname": "Grace Lee",
+    "password": "1234",
+    "id": "grace"
+  },
+  {
+    "nickname": "Hannah Scott",
+    "password": "1234",
+    "id": "hanna"
+  },
+  {
+    "nickname": "Ian Davis",
+    "password": "1234",
+    "id": "ianda"
+  },
+  {
+    "nickname": "Jill Thompson",
+    "password": "1234",
+    "id": "jillt"
+  }
+]

server/routers/epja-2024-1/enterfront/change/index.js

@@ -0,0 +1,64 @@
+const changeRouter = require('express').Router();
+
+module.exports = changeRouter;
+
+const { getUserFromDB, deleteUserFromDB, addUserToDB } = require('../db');
+
+
+changeRouter.post('/nickname', (req, res) => {
+    const { id, newNickname } = req.body;
+
+    const user = getUserFromDB(id);
+
+    // Invalid identification
+    if (!user) {
+        res.status(401).send({message: 'Invalid credentials (id)'});
+        return;
+    }
+
+    const updatedUser = {
+        "nickname": newNickname,
+        "password": user.password,
+        "id": user.id
+    };
+
+    // Delete the old one
+    deleteUserFromDB(id)
+
+    // Insert updated
+    addUserToDB(updatedUser);
+
+    res.status(200).send({});
+});
+
+changeRouter.post('/password', (req, res) => {
+    const { id, newPassword } = req.body;
+
+    const user = getUserFromDB(id);
+
+    // Invalid identification
+    if (!user) {
+        res.status(401).send({message: 'Invalid credentials (id)'});
+        return;
+    }
+
+    // Delete the old one
+    deleteUserFromDB(id)
+
+    // Insert updated
+    const updatedUser = {
+        "nickname": user.nickname,
+        "password": newPassword,
+        "id": user.id
+    };
+    addUserToDB(updatedUser);
+
+    res.status(200).send({});
+});
+
+changeRouter.delete('/:id', (req, res) => {
+    const { id } = req.params;
+
+    deleteUserFromDB(id);
+});
+

server/routers/epja-2024-1/enterfront/chat/chats.json

@@ -0,0 +1,662 @@
+[
+  {
+    "id1": "alice",
+    "id2": "bobsm",
+    "messages": [
+      {
+        "data": "Hello Bob!",
+        "senderId": "alice",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 07:00:00"
+      },
+      {
+        "data": "Hey Alice, how are you?",
+        "senderId": "bobsm",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:05:00"
+      },
+      {
+        "data": "I'm good, thanks for asking.",
+        "senderId": "alice",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 07:10:00"
+      },
+      {
+        "data": "Glad to hear!",
+        "senderId": "bobsm",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "charl",
+    "messages": [
+      {
+        "data": "How's the project going?",
+        "senderId": "alice",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 07:20:00"
+      },
+      {
+        "data": "It's coming along, almost done!",
+        "senderId": "charl",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:25:00"
+      },
+      {
+        "data": "That's great to hear!",
+        "senderId": "alice",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 07:30:00"
+      },
+      {
+        "data": "Thanks for checking in.",
+        "senderId": "charl",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "david",
+    "messages": [
+      {
+        "data": "Did you get the files?",
+        "senderId": "david",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:40:00"
+      },
+      {
+        "data": "Yes, I did. Thank you!",
+        "senderId": "alice",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 07:45:00"
+      },
+      {
+        "data": "You're welcome.",
+        "senderId": "david",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 07:50:00"
+      },
+      {
+        "data": "Let me know if you need anything else.",
+        "senderId": "alice",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 07:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "frank",
+    "messages": [
+      {
+        "data": "Can you review this document for me?",
+        "senderId": "alice",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 08:20:00"
+      },
+      {
+        "data": "Sure, I'll take a look.",
+        "senderId": "frank",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 08:25:00"
+      },
+      {
+        "data": "Thanks, much appreciated!",
+        "senderId": "alice",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 08:30:00"
+      },
+      {
+        "data": "No problem.",
+        "senderId": "frank",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 08:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "grace",
+    "messages": [
+      {
+        "data": "Hey Grace, let's meet up for coffee!",
+        "senderId": "alice",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 08:40:00"
+      },
+      {
+        "data": "Sounds good, when are you free?",
+        "senderId": "grace",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 08:45:00"
+      },
+      {
+        "data": "How about tomorrow afternoon?",
+        "senderId": "alice",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 08:50:00"
+      },
+      {
+        "data": "Works for me!",
+        "senderId": "grace",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 08:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "hanna",
+    "messages": [
+      {
+        "data": "Hannah, do you have a moment?",
+        "senderId": "alice",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 09:00:00"
+      },
+      {
+        "data": "Sure, what's up?",
+        "senderId": "hanna",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:05:00"
+      },
+      {
+        "data": "Just wanted to check on the report.",
+        "senderId": "alice",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 09:10:00"
+      },
+      {
+        "data": "I'll send it soon.",
+        "senderId": "hanna",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "ianda",
+    "messages": [
+      {
+        "data": "Ian, have you completed the review?",
+        "senderId": "alice",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 09:20:00"
+      },
+      {
+        "data": "Yes, I sent my feedback.",
+        "senderId": "ianda",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:25:00"
+      },
+      {
+        "data": "Thanks for that.",
+        "senderId": "alice",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 09:30:00"
+      },
+      {
+        "data": "Anytime!",
+        "senderId": "ianda",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "jillt",
+    "messages": [
+      {
+        "data": "Jill, let's schedule a catch-up meeting.",
+        "senderId": "alice",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 09:40:00"
+      },
+      {
+        "data": "Sounds good, when works for you?",
+        "senderId": "jillt",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:45:00"
+      },
+      {
+        "data": "Tomorrow afternoon?",
+        "senderId": "alice",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 09:50:00"
+      },
+      {
+        "data": "That works for me!",
+        "senderId": "jillt",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 09:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "alice",
+    "id2": "evead",
+    "messages": [
+      {
+        "data": "Eve, did you send the schedule?",
+        "senderId": "alice",
+        "recipientId": "evead",
+        "timestamp": "09.10.2024 10:00:00"
+      },
+      {
+        "data": "Yes, just sent it.",
+        "senderId": "evead",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 10:05:00"
+      },
+      {
+        "data": "Thanks, much appreciated!",
+        "senderId": "alice",
+        "recipientId": "evead",
+        "timestamp": "09.10.2024 10:10:00"
+      },
+      {
+        "data": "No problem!",
+        "senderId": "evead",
+        "recipientId": "alice",
+        "timestamp": "09.10.2024 10:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "bobsm",
+    "id2": "charl",
+    "messages": [
+      {
+        "data": "How's everything going?",
+        "senderId": "bobsm",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 10:20:00"
+      },
+      {
+        "data": "Pretty good, how about you?",
+        "senderId": "charl",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 10:25:00"
+      },
+      {
+        "data": "Can't complain!",
+        "senderId": "bobsm",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 10:30:00"
+      },
+      {
+        "data": "Glad to hear that.",
+        "senderId": "charl",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 10:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "bobsm",
+    "id2": "david",
+    "messages": [
+      {
+        "data": "Can you send the report?",
+        "senderId": "bobsm",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 10:40:00"
+      },
+      {
+        "data": "I'll send it in an hour.",
+        "senderId": "david",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 10:45:00"
+      },
+      {
+        "data": "Perfect, thanks.",
+        "senderId": "bobsm",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 10:50:00"
+      },
+      {
+        "data": "No problem.",
+        "senderId": "david",
+        "recipientId": "bobsm",
+        "timestamp": "09.10.2024 10:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "charl",
+    "id2": "evead",
+    "messages": [
+      {
+        "data": "Hey Eve, how's it going?",
+        "senderId": "charl",
+        "recipientId": "evead",
+        "timestamp": "09.10.2024 11:00:00"
+      },
+      {
+        "data": "Good, how about you?",
+        "senderId": "evead",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 11:05:00"
+      },
+      {
+        "data": "Can't complain!",
+        "senderId": "charl",
+        "recipientId": "evead",
+        "timestamp": "09.10.2024 11:10:00"
+      },
+      {
+        "data": "Glad to hear.",
+        "senderId": "evead",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 11:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "charl",
+    "id2": "frank",
+    "messages": [
+      {
+        "data": "Do you have time to talk today?",
+        "senderId": "charl",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 11:20:00"
+      },
+      {
+        "data": "I have a meeting, but I can chat afterward.",
+        "senderId": "frank",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 11:25:00"
+      },
+      {
+        "data": "Sounds good.",
+        "senderId": "charl",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 11:30:00"
+      },
+      {
+        "data": "I'll message you after.",
+        "senderId": "frank",
+        "recipientId": "charl",
+        "timestamp": "09.10.2024 11:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "david",
+    "id2": "frank",
+    "messages": [
+      {
+        "data": "Did you review the document?",
+        "senderId": "david",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 11:40:00"
+      },
+      {
+        "data": "Yes, it's all good.",
+        "senderId": "frank",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 11:45:00"
+      },
+      {
+        "data": "Great, thanks for the quick turnaround!",
+        "senderId": "david",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 11:50:00"
+      },
+      {
+        "data": "No worries!",
+        "senderId": "frank",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 11:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "david",
+    "id2": "grace",
+    "messages": [
+      {
+        "data": "Grace, can you send the updated schedule?",
+        "senderId": "david",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 12:00:00"
+      },
+      {
+        "data": "Yes, I'll send it in a few minutes.",
+        "senderId": "grace",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 12:05:00"
+      },
+      {
+        "data": "Thanks, much appreciated!",
+        "senderId": "david",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 12:10:00"
+      },
+      {
+        "data": "You're welcome!",
+        "senderId": "grace",
+        "recipientId": "david",
+        "timestamp": "09.10.2024 12:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "frank",
+    "id2": "grace",
+    "messages": [
+      {
+        "data": "How are you today?",
+        "senderId": "frank",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 12:20:00"
+      },
+      {
+        "data": "I'm doing well, thanks for asking.",
+        "senderId": "grace",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 12:25:00"
+      },
+      {
+        "data": "Glad to hear that.",
+        "senderId": "frank",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 12:30:00"
+      },
+      {
+        "data": "How about you?",
+        "senderId": "grace",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 12:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "frank",
+    "id2": "hanna",
+    "messages": [
+      {
+        "data": "Did you attend the meeting?",
+        "senderId": "frank",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 12:40:00"
+      },
+      {
+        "data": "Yes, it was productive.",
+        "senderId": "hanna",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 12:45:00"
+      },
+      {
+        "data": "Good to hear!",
+        "senderId": "frank",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 12:50:00"
+      },
+      {
+        "data": "Indeed, lots to follow up on.",
+        "senderId": "hanna",
+        "recipientId": "frank",
+        "timestamp": "09.10.2024 12:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "grace",
+    "id2": "hanna",
+    "messages": [
+      {
+        "data": "Can we meet later today?",
+        "senderId": "grace",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 01:00:00"
+      },
+      {
+        "data": "Sure, what's a good time?",
+        "senderId": "hanna",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 01:05:00"
+      },
+      {
+        "data": "How about 3?",
+        "senderId": "grace",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 01:10:00"
+      },
+      {
+        "data": "Works for me.",
+        "senderId": "hanna",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 01:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "grace",
+    "id2": "ianda",
+    "messages": [
+      {
+        "data": "Ian, did you get the message I sent?",
+        "senderId": "grace",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 01:20:00"
+      },
+      {
+        "data": "Yes, I'll respond soon.",
+        "senderId": "ianda",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 01:25:00"
+      },
+      {
+        "data": "Thanks, appreciate it!",
+        "senderId": "grace",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 01:30:00"
+      },
+      {
+        "data": "You're welcome!",
+        "senderId": "ianda",
+        "recipientId": "grace",
+        "timestamp": "09.10.2024 01:35:00"
+      }
+    ]
+  },
+  {
+    "id1": "hanna",
+    "id2": "ianda",
+    "messages": [
+      {
+        "data": "Ian, do you have a minute?",
+        "senderId": "hanna",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 01:40:00"
+      },
+      {
+        "data": "Yes, what do you need?",
+        "senderId": "ianda",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 01:45:00"
+      },
+      {
+        "data": "Just a quick update on the project.",
+        "senderId": "hanna",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 01:50:00"
+      },
+      {
+        "data": "I'll email you the details.",
+        "senderId": "ianda",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 01:55:00"
+      }
+    ]
+  },
+  {
+    "id1": "hanna",
+    "id2": "jillt",
+    "messages": [
+      {
+        "data": "Jill, can we talk tomorrow?",
+        "senderId": "hanna",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 02:00:00"
+      },
+      {
+        "data": "Yes, I'm free after 2.",
+        "senderId": "jillt",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 02:05:00"
+      },
+      {
+        "data": "Perfect, see you then.",
+        "senderId": "hanna",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 02:10:00"
+      },
+      {
+        "data": "Looking forward to it.",
+        "senderId": "jillt",
+        "recipientId": "hanna",
+        "timestamp": "09.10.2024 02:15:00"
+      }
+    ]
+  },
+  {
+    "id1": "ianda",
+    "id2": "jillt",
+    "messages": [
+      {
+        "data": "Jill, I have the files you requested.",
+        "senderId": "ianda",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 02:20:00"
+      },
+      {
+        "data": "Thanks, please send them over.",
+        "senderId": "jillt",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 02:25:00"
+      },
+      {
+        "data": "I'll send them right now.",
+        "senderId": "ianda",
+        "recipientId": "jillt",
+        "timestamp": "09.10.2024 02:30:00"
+      },
+      {
+        "data": "Great, thanks again!",
+        "senderId": "jillt",
+        "recipientId": "ianda",
+        "timestamp": "09.10.2024 02:35:00"
+      }
+    ]
+  }
+]

server/routers/epja-2024-1/enterfront/chat/index.js

@@ -0,0 +1,86 @@
+const chatRouter = require('express').Router();
+
+module.exports = chatRouter;
+
+const { getChatFromDB, getUsersChats, addChatToDB, getUserFromDB,
+    addMessageToChat} = require('../db');
+
+chatRouter.get('/item/:id1/:id2', (req, res) => {
+    const { id1, id2 } = req.params;
+
+    if (id1 === id2) {
+        res.status(400).send({message: 'Ids should be different'});
+        return;
+    }
+
+    const chat = getChatFromDB(id1, id2);
+
+    if (chat) {
+        res.status(200).send({chat});
+    } else {
+        res.status(404).send({message: 'Chat was not found'});
+    }
+})
+
+chatRouter.post('/item/:id1/:id2', (req, res) => {
+    const { id1, id2 } = req.params;
+
+    if (id1 === id2) {
+        res.status(400).send({message: 'Ids should be different'});
+        return;
+    }
+
+    const chat = getChatFromDB(id1, id2);
+
+    if (chat) {
+        // Chat already exists
+        res.status(200).send({chat});
+    } else {
+        if (!getUserFromDB(id1) || !getUserFromDB(id2)) {
+            res.status(404).send({message: 'Such interlocutor does not exist'});
+        } else {
+            // Creating new chat
+            const newChat = {
+                id1: id1,
+                id2: id2,
+                messages: []
+            }
+
+            addChatToDB(newChat);
+
+            res.status(200).send({newChat});
+        }
+    }
+})
+
+chatRouter.get('/list/:id', (req, res) => {
+    const { id } = req.params;
+
+    const userChats = getUsersChats(id);
+
+    if (!userChats) {
+        res.status(404).send({message: 'Error with retrieving chats'});
+    } else {
+        res.status(200).send({chats: userChats});
+    }
+})
+
+chatRouter.post('/message/:sender/:receiver', (req, res) => {
+    const { sender, receiver } = req.params;
+    const { message } = req.body;
+
+    const chat = getChatFromDB(sender, receiver);
+
+    if (!chat) {
+        // Chat already exists
+        res.status(400).send({message: "Such chat does not exist"});
+    } else {
+        if (!getUserFromDB(sender) || !getUserFromDB(receiver)) {
+            res.status(404).send({message: 'Such people do not exist'});
+        } else {
+            // Add new message
+            addMessageToChat(chat, message);
+            res.status(200).send({});
+        }
+    }
+})

server/routers/epja-2024-1/enterfront/db.js

@@ -0,0 +1,74 @@
+// Read already defined users (pseudo-DB)
+const users = require('./auth/users.json');
+const chats = require('./chat/chats.json');
+
+const getUserFromDB = (userID) => {
+    if (!userID) {return false;}
+
+    // Accessing 'DB'
+    const user = users.find((user) => user.id === userID);
+
+    if (user) {
+        return user;
+    } else {
+        return false;
+    }
+}
+
+const deleteUserFromDB = (userID) => {
+    const index = users.findIndex(item => item.id === userID);
+    if (index !== -1) {
+        users.splice(index, 1);
+    }
+}
+
+const addUserToDB = (user) => {
+    users.push(user);
+}
+
+const getChatFromDB = (firstID, secondID) => {
+    if (!firstID || !secondID) {return false;}
+
+    // Accessing 'DB'
+    const chat = chats.find((item) =>
+        (item.id1 === firstID && item.id2 === secondID) || (item.id1 === secondID && item.id2 === firstID));
+
+    if (chat) {
+        return chat;
+    } else {
+        return false;
+    }
+}
+
+const getUsersChats = (userID) => {
+    if (!userID) {return false;}
+
+    const userChats = chats.filter((chat) => (chat.id1 === userID || chat.id2 === userID));
+
+    if (userChats) {
+        return userChats;
+    } else {
+        return false;
+    }
+}
+
+const addMessageToChat = (chat, msg) => {
+    chat.messages.push(msg);
+}
+
+const deleteChatFromDB = (firstID, secondID) => {
+    const index = chats.findIndex(item =>
+        (item.id1 === firstID && item.id2 === secondID) || (item.id1 === secondID && item.id2 === firstID));
+
+    if (index !== -1) {
+        chats.splice(index, 1);
+    }
+}
+
+const addChatToDB = (chat) => {
+    chats.push(chat);
+}
+
+
+module.exports = {users, chats, getUserFromDB, getChatFromDB, addUserToDB,
+    deleteUserFromDB, addChatToDB, deleteChatFromDB, getUsersChats, addMessageToChat}

server/routers/epja-2024-1/enterfront/index.js

@@ -0,0 +1,17 @@
+const changeRouter = require("./change");
+const authRouter = require("./auth");
+const chatRouter = require("./chat");
+
+const router = require('express').Router();
+
+const delay = require('./middlewares/delay');
+const verify = require('./middlewares/verify');
+
+module.exports = router;
+
+// router.use(delay(300));
+// router.use('/books', delay, booksRouter);
+
+router.use('/auth', authRouter);
+router.use('/change', verify, changeRouter);
+router.use('/chat', verify, chatRouter)

server/routers/epja-2024-1/enterfront/key.js

@@ -0,0 +1,3 @@
+const TOKEN_KEY = '5frv12e4few3r';
+
+module.exports = { TOKEN_KEY }

server/routers/epja-2024-1/enterfront/middlewares/delay.js

@@ -0,0 +1,5 @@
+const delay = (ms = 1000) => (req, res, next) => {
+    setTimeout(next, ms)
+}
+
+module.exports = delay

server/routers/epja-2024-1/enterfront/middlewares/verify.js

@@ -0,0 +1,22 @@
+const jwt = require('jsonwebtoken');
+
+const { TOKEN_KEY } = require('../key')
+
+function verifyToken(req, res, next) {
+    const token = req.headers['authorization']?.split(' ')[1];
+
+    if (!token) {
+        return res.status(401).send({ message: 'No token provided' });
+    }
+
+    // Verify token
+    jwt.verify(token, TOKEN_KEY, (err, decoded) => {
+        if (err) {
+            return res.status(401).send({ message: 'Unauthorized' });
+        }
+
+        next(); // Proceed to the next middleware or route
+    });
+}
+
+module.exports = verifyToken;

server/routers/epja-2024-1/index.js

@@ -0,0 +1,7 @@
+const express = require('express')
+const router = express.Router()
+
+
+router.use('/enterfront', require('./enterfront/index'))
+
+module.exports = router