From 18a1095cf09788b8f16df061366963aa8a2f3e4f Mon Sep 17 00:00:00 2001
From: Nikolai Petukhov <n.petukhov@innopolis.university>
Date: Thu, 10 Oct 2024 12:02:52 +0300
Subject: [PATCH 1/4] enterfront

---
 .../epja-2024-1/enterfront/auth/index.js      |  77 ++
 .../epja-2024-1/enterfront/auth/users.json    |  52 ++
 .../epja-2024-1/enterfront/change/index.js    |  69 ++
 .../epja-2024-1/enterfront/chat/chats.json    | 662 ++++++++++++++++++
 .../epja-2024-1/enterfront/chat/index.js      |  91 +++
 server/routers/epja-2024-1/enterfront/db.js   |  74 ++
 .../routers/epja-2024-1/enterfront/index.js   |  17 +
 .../enterfront/middlewares/delay.js           |   5 +
 .../enterfront/middlewares/verify.js          |  23 +
 server/routers/epja-2024-1/example/index.js   |  26 +
 server/routers/epja-2024-1/example/news.json  |  25 +
 server/routers/epja-2024-1/index.js           |   9 +
 12 files changed, 1130 insertions(+)
 create mode 100644 server/routers/epja-2024-1/enterfront/auth/index.js
 create mode 100644 server/routers/epja-2024-1/enterfront/auth/users.json
 create mode 100644 server/routers/epja-2024-1/enterfront/change/index.js
 create mode 100644 server/routers/epja-2024-1/enterfront/chat/chats.json
 create mode 100644 server/routers/epja-2024-1/enterfront/chat/index.js
 create mode 100644 server/routers/epja-2024-1/enterfront/db.js
 create mode 100644 server/routers/epja-2024-1/enterfront/index.js
 create mode 100644 server/routers/epja-2024-1/enterfront/middlewares/delay.js
 create mode 100644 server/routers/epja-2024-1/enterfront/middlewares/verify.js
 create mode 100644 server/routers/epja-2024-1/example/index.js
 create mode 100644 server/routers/epja-2024-1/example/news.json
 create mode 100644 server/routers/epja-2024-1/index.js

diff --git a/server/routers/epja-2024-1/enterfront/auth/index.js b/server/routers/epja-2024-1/enterfront/auth/index.js
new file mode 100644
index 0000000..ea32017
--- /dev/null
+++ b/server/routers/epja-2024-1/enterfront/auth/index.js
@@ -0,0 +1,77 @@
+const authRouter = require('express').Router();
+
+// For creating tokens
+const jwt = require('jsonwebtoken');
+
+require('dotenv').config();
+const TOKEN_KEY = process.env.TOKEN_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);
+    console.log("Request get in /auth:", 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;
+    console.log("Request login in /auth:", name);
+
+    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;
+    console.log("Request reg in /auth:", name);
+
+    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});
+})
diff --git a/server/routers/epja-2024-1/enterfront/auth/users.json b/server/routers/epja-2024-1/enterfront/auth/users.json
new file mode 100644
index 0000000..7e8c98e
--- /dev/null
+++ b/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"
+  }
+]
diff --git a/server/routers/epja-2024-1/enterfront/change/index.js b/server/routers/epja-2024-1/enterfront/change/index.js
new file mode 100644
index 0000000..c5e0837
--- /dev/null
+++ b/server/routers/epja-2024-1/enterfront/change/index.js
@@ -0,0 +1,69 @@
+const changeRouter = require('express').Router();
+
+module.exports = changeRouter;
+
+const { users, getUserFromDB, deleteUserFromDB, addUserToDB } = require('../db');
+
+const jwt = require("jsonwebtoken");
+
+
+changeRouter.post('/nickname', (req, res) => {
+    const { id, newNickname } = req.body;
+    console.log("Request nickname in /change:", id);
+
+    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;
+    console.log("Request password in /change:", id);
+
+    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;
+    console.log("Request delete in /change:", id);
+
+    deleteUserFromDB(id);
+});
+
diff --git a/server/routers/epja-2024-1/enterfront/chat/chats.json b/server/routers/epja-2024-1/enterfront/chat/chats.json
new file mode 100644
index 0000000..4e9d173
--- /dev/null
+++ b/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"
+      }
+    ]
+  }
+]
diff --git a/server/routers/epja-2024-1/enterfront/chat/index.js b/server/routers/epja-2024-1/enterfront/chat/index.js
new file mode 100644
index 0000000..fd1d5cf
--- /dev/null
+++ b/server/routers/epja-2024-1/enterfront/chat/index.js
@@ -0,0 +1,91 @@
+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;
+    console.log("Request get in /chat:", id1, id2);
+
+    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;
+    console.log("Request post in /chat:", id1, id2);
+
+    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;
+
+    console.log("Request get /list in /chat:", id);
+
+    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;
+    console.log("Request post /message in /chat:", sender, receiver, message);
+
+    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({});
+        }
+    }
+})
diff --git a/server/routers/epja-2024-1/enterfront/db.js b/server/routers/epja-2024-1/enterfront/db.js
new file mode 100644
index 0000000..1a573d0
--- /dev/null
+++ b/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}
diff --git a/server/routers/epja-2024-1/enterfront/index.js b/server/routers/epja-2024-1/enterfront/index.js
new file mode 100644
index 0000000..17f1ced
--- /dev/null
+++ b/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)
diff --git a/server/routers/epja-2024-1/enterfront/middlewares/delay.js b/server/routers/epja-2024-1/enterfront/middlewares/delay.js
new file mode 100644
index 0000000..789a7b6
--- /dev/null
+++ b/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
diff --git a/server/routers/epja-2024-1/enterfront/middlewares/verify.js b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
new file mode 100644
index 0000000..bcc653d
--- /dev/null
+++ b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
@@ -0,0 +1,23 @@
+const jwt = require('jsonwebtoken');
+
+require('dotenv').config();
+const TOKEN_KEY = process.env.TOKEN_KEY;
+
+function verifyToken(req, res, next) {
+    const token = req.headers['authorization']?.split(' ')[1];
+
+    if (!token) {
+        return res.status(403).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;
diff --git a/server/routers/epja-2024-1/example/index.js b/server/routers/epja-2024-1/example/index.js
new file mode 100644
index 0000000..68094b4
--- /dev/null
+++ b/server/routers/epja-2024-1/example/index.js
@@ -0,0 +1,26 @@
+const express = require("express");
+const router = express.Router()
+
+const waitMiddleware = (req, res, next) => {
+    setTimeout(() => {
+        next()
+    }, 3000)
+}
+
+const listActivated = true
+router.get('/list', waitMiddleware, (req, res) => {
+    req.user
+
+    if (listActivated) {
+        res.status(200).send(require('./news.json'))
+    } else {
+        res.status(500).send()
+    }
+})
+
+router.get('/list-activate-toggle', (req, res) => {
+    listActivated = !listActivated
+    res.send(listActivated ? 'Activated' : 'Deactivated')
+})
+
+module.exports = router
diff --git a/server/routers/epja-2024-1/example/news.json b/server/routers/epja-2024-1/example/news.json
new file mode 100644
index 0000000..18e0fb1
--- /dev/null
+++ b/server/routers/epja-2024-1/example/news.json
@@ -0,0 +1,25 @@
+{
+  "ok": true,
+  "data": [
+    {
+      "id": "1",
+      "name": "Some name 1",
+      "description": "Some long long long long description"
+    },
+    {
+      "id": "2",
+      "name": "Some name 2",
+      "description": "Some long long long long description"
+    },
+    {
+      "id": "3",
+      "name": "Some name 3",
+      "description": "Some long long long long description"
+    },
+    {
+      "id": "4",
+      "name": "Some name 4",
+      "description": "Some long long long long description"
+    }
+  ]
+}
diff --git a/server/routers/epja-2024-1/index.js b/server/routers/epja-2024-1/index.js
new file mode 100644
index 0000000..da4ff89
--- /dev/null
+++ b/server/routers/epja-2024-1/index.js
@@ -0,0 +1,9 @@
+const express = require('express')
+const router = express.Router()
+
+
+router.use('/example', require('./example/index'))
+router.use('/enterfront', require('./enterfront/index'))
+
+
+module.exports = router
-- 
2.45.2


From f13ae33cb45f5ddb4641d547248f27ac5dd12428 Mon Sep 17 00:00:00 2001
From: Nikolai Petukhov <n.petukhov@innopolis.university>
Date: Thu, 10 Oct 2024 13:06:58 +0300
Subject: [PATCH 2/4] added a route for epja-2024-1

---
 server/index.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/index.js b/server/index.js
index 13e77c7..962b52a 100644
--- a/server/index.js
+++ b/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'))
 
-- 
2.45.2


From b215e22f53d07c39337ea74861284f938afa76d5 Mon Sep 17 00:00:00 2001
From: Nikolai Petukhov <n.petukhov@innopolis.university>
Date: Sat, 12 Oct 2024 11:17:21 +0300
Subject: [PATCH 3/4] fixed const key, logs, deleted example

---
 .vscode/launch.json                           | 26 -------------------
 .../epja-2024-1/enterfront/auth/index.js      |  6 +----
 .../epja-2024-1/enterfront/change/index.js    |  7 +----
 .../epja-2024-1/enterfront/chat/index.js      |  5 ----
 server/routers/epja-2024-1/enterfront/key.js  |  3 +++
 .../enterfront/middlewares/verify.js          |  3 +--
 server/routers/epja-2024-1/example/index.js   | 26 -------------------
 server/routers/epja-2024-1/example/news.json  | 25 ------------------
 server/routers/epja-2024-1/index.js           |  2 --
 9 files changed, 6 insertions(+), 97 deletions(-)
 delete mode 100644 .vscode/launch.json
 create mode 100644 server/routers/epja-2024-1/enterfront/key.js
 delete mode 100644 server/routers/epja-2024-1/example/index.js
 delete mode 100644 server/routers/epja-2024-1/example/news.json

diff --git a/.vscode/launch.json b/.vscode/launch.json
deleted file mode 100644
index 60cc5a1..0000000
--- a/.vscode/launch.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "type": "pwa-node",
-            "request": "launch",
-            "name": "Launch Program",
-            "skipFiles": [
-                "<node_internals>/**"
-            ],
-            "program": "${workspaceFolder}/server/index.js"
-        },
-        {
-            "name": "attach",
-            "type": "pwa-node",
-            "request": "attach",
-            "skipFiles": [
-                "<node_internals>/**"
-            ],
-            "processId": "${command:PickProcess}"
-        }
-    ]
-}
\ No newline at end of file
diff --git a/server/routers/epja-2024-1/enterfront/auth/index.js b/server/routers/epja-2024-1/enterfront/auth/index.js
index ea32017..abfd874 100644
--- a/server/routers/epja-2024-1/enterfront/auth/index.js
+++ b/server/routers/epja-2024-1/enterfront/auth/index.js
@@ -3,8 +3,7 @@ const authRouter = require('express').Router();
 // For creating tokens
 const jwt = require('jsonwebtoken');
 
-require('dotenv').config();
-const TOKEN_KEY = process.env.TOKEN_KEY;
+const { TOKEN_KEY } = require('../key')
 
 
 module.exports = authRouter;
@@ -15,7 +14,6 @@ const { addUserToDB, getUserFromDB } = require('../db');
 // Get a user by its id
 authRouter.get('/:id', (req, res) => {
     const user = getUserFromDB(req.params.id);
-    console.log("Request get in /auth:", req.params.id);
 
     if (user) {
         res.status(200).send({user});
@@ -27,7 +25,6 @@ authRouter.get('/:id', (req, res) => {
 // For login (authorization)
 authRouter.post('/login', (req, res) => {
     const { name, password } = req.body;
-    console.log("Request login in /auth:", name);
 
     const user = getUserFromDB(name);
 
@@ -54,7 +51,6 @@ authRouter.post('/login', (req, res) => {
 
 authRouter.post('/reg', (req, res) => {
     const { name, password, nickname } = req.body;
-    console.log("Request reg in /auth:", name);
 
     const user = getUserFromDB(name);
 
diff --git a/server/routers/epja-2024-1/enterfront/change/index.js b/server/routers/epja-2024-1/enterfront/change/index.js
index c5e0837..b5d2b7e 100644
--- a/server/routers/epja-2024-1/enterfront/change/index.js
+++ b/server/routers/epja-2024-1/enterfront/change/index.js
@@ -2,14 +2,11 @@ const changeRouter = require('express').Router();
 
 module.exports = changeRouter;
 
-const { users, getUserFromDB, deleteUserFromDB, addUserToDB } = require('../db');
-
-const jwt = require("jsonwebtoken");
+const { getUserFromDB, deleteUserFromDB, addUserToDB } = require('../db');
 
 
 changeRouter.post('/nickname', (req, res) => {
     const { id, newNickname } = req.body;
-    console.log("Request nickname in /change:", id);
 
     const user = getUserFromDB(id);
 
@@ -36,7 +33,6 @@ changeRouter.post('/nickname', (req, res) => {
 
 changeRouter.post('/password', (req, res) => {
     const { id, newPassword } = req.body;
-    console.log("Request password in /change:", id);
 
     const user = getUserFromDB(id);
 
@@ -62,7 +58,6 @@ changeRouter.post('/password', (req, res) => {
 
 changeRouter.delete('/:id', (req, res) => {
     const { id } = req.params;
-    console.log("Request delete in /change:", id);
 
     deleteUserFromDB(id);
 });
diff --git a/server/routers/epja-2024-1/enterfront/chat/index.js b/server/routers/epja-2024-1/enterfront/chat/index.js
index fd1d5cf..ce2f169 100644
--- a/server/routers/epja-2024-1/enterfront/chat/index.js
+++ b/server/routers/epja-2024-1/enterfront/chat/index.js
@@ -7,7 +7,6 @@ const { getChatFromDB, getUsersChats, addChatToDB, getUserFromDB,
 
 chatRouter.get('/item/:id1/:id2', (req, res) => {
     const { id1, id2 } = req.params;
-    console.log("Request get in /chat:", id1, id2);
 
     if (id1 === id2) {
         res.status(400).send({message: 'Ids should be different'});
@@ -25,7 +24,6 @@ chatRouter.get('/item/:id1/:id2', (req, res) => {
 
 chatRouter.post('/item/:id1/:id2', (req, res) => {
     const { id1, id2 } = req.params;
-    console.log("Request post in /chat:", id1, id2);
 
     if (id1 === id2) {
         res.status(400).send({message: 'Ids should be different'});
@@ -58,8 +56,6 @@ chatRouter.post('/item/:id1/:id2', (req, res) => {
 chatRouter.get('/list/:id', (req, res) => {
     const { id } = req.params;
 
-    console.log("Request get /list in /chat:", id);
-
     const userChats = getUsersChats(id);
 
     if (!userChats) {
@@ -72,7 +68,6 @@ chatRouter.get('/list/:id', (req, res) => {
 chatRouter.post('/message/:sender/:receiver', (req, res) => {
     const { sender, receiver } = req.params;
     const { message } = req.body;
-    console.log("Request post /message in /chat:", sender, receiver, message);
 
     const chat = getChatFromDB(sender, receiver);
 
diff --git a/server/routers/epja-2024-1/enterfront/key.js b/server/routers/epja-2024-1/enterfront/key.js
new file mode 100644
index 0000000..d02db5a
--- /dev/null
+++ b/server/routers/epja-2024-1/enterfront/key.js
@@ -0,0 +1,3 @@
+const TOKEN_KEY = '5frv12e4few3r';
+
+module.exports = { TOKEN_KEY }
\ No newline at end of file
diff --git a/server/routers/epja-2024-1/enterfront/middlewares/verify.js b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
index bcc653d..74f585b 100644
--- a/server/routers/epja-2024-1/enterfront/middlewares/verify.js
+++ b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
@@ -1,7 +1,6 @@
 const jwt = require('jsonwebtoken');
 
-require('dotenv').config();
-const TOKEN_KEY = process.env.TOKEN_KEY;
+const { TOKEN_KEY } = require('../key')
 
 function verifyToken(req, res, next) {
     const token = req.headers['authorization']?.split(' ')[1];
diff --git a/server/routers/epja-2024-1/example/index.js b/server/routers/epja-2024-1/example/index.js
deleted file mode 100644
index 68094b4..0000000
--- a/server/routers/epja-2024-1/example/index.js
+++ /dev/null
@@ -1,26 +0,0 @@
-const express = require("express");
-const router = express.Router()
-
-const waitMiddleware = (req, res, next) => {
-    setTimeout(() => {
-        next()
-    }, 3000)
-}
-
-const listActivated = true
-router.get('/list', waitMiddleware, (req, res) => {
-    req.user
-
-    if (listActivated) {
-        res.status(200).send(require('./news.json'))
-    } else {
-        res.status(500).send()
-    }
-})
-
-router.get('/list-activate-toggle', (req, res) => {
-    listActivated = !listActivated
-    res.send(listActivated ? 'Activated' : 'Deactivated')
-})
-
-module.exports = router
diff --git a/server/routers/epja-2024-1/example/news.json b/server/routers/epja-2024-1/example/news.json
deleted file mode 100644
index 18e0fb1..0000000
--- a/server/routers/epja-2024-1/example/news.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "ok": true,
-  "data": [
-    {
-      "id": "1",
-      "name": "Some name 1",
-      "description": "Some long long long long description"
-    },
-    {
-      "id": "2",
-      "name": "Some name 2",
-      "description": "Some long long long long description"
-    },
-    {
-      "id": "3",
-      "name": "Some name 3",
-      "description": "Some long long long long description"
-    },
-    {
-      "id": "4",
-      "name": "Some name 4",
-      "description": "Some long long long long description"
-    }
-  ]
-}
diff --git a/server/routers/epja-2024-1/index.js b/server/routers/epja-2024-1/index.js
index da4ff89..2097192 100644
--- a/server/routers/epja-2024-1/index.js
+++ b/server/routers/epja-2024-1/index.js
@@ -2,8 +2,6 @@ const express = require('express')
 const router = express.Router()
 
 
-router.use('/example', require('./example/index'))
 router.use('/enterfront', require('./enterfront/index'))
 
-
 module.exports = router
-- 
2.45.2


From 89c9d7f90148f312fdc5ed8e0802693fd60c5a39 Mon Sep 17 00:00:00 2001
From: Nikolai Petukhov <n.petukhov@innopolis.university>
Date: Sat, 12 Oct 2024 11:21:47 +0300
Subject: [PATCH 4/4] fixed error code

---
 .vscode/launch.json                           | 26 +++++++++++++++++++
 .../enterfront/middlewares/verify.js          |  2 +-
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 .vscode/launch.json

diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..60cc5a1
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,26 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "pwa-node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${workspaceFolder}/server/index.js"
+        },
+        {
+            "name": "attach",
+            "type": "pwa-node",
+            "request": "attach",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "processId": "${command:PickProcess}"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/server/routers/epja-2024-1/enterfront/middlewares/verify.js b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
index 74f585b..e0c462c 100644
--- a/server/routers/epja-2024-1/enterfront/middlewares/verify.js
+++ b/server/routers/epja-2024-1/enterfront/middlewares/verify.js
@@ -6,7 +6,7 @@ function verifyToken(req, res, next) {
     const token = req.headers['authorization']?.split(' ')[1];
 
     if (!token) {
-        return res.status(403).send({ message: 'No token provided' });
+        return res.status(401).send({ message: 'No token provided' });
     }
 
     // Verify token
-- 
2.45.2