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Completed All assignments expect the medium one #264

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Completed All assignments expect the medium one #264

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120 changes: 102 additions & 18 deletions week-3/02-course-app-easy-2/index.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
const express = require('express');
const jwt = require('jsonwebtoken');
const app = express();

app.use(express.json());
Expand All @@ -7,46 +8,129 @@ let ADMINS = [];
let USERS = [];
let COURSES = [];

// Admin routes
const secretKey = "superS3cr3t1";

const generateJwt = (user) => {
const payload = {username: user.username};
return jwt.sign(payload,secretKey, {expiresIn: '1h'});
}

const authenticateJwt = (req, res, next) => {
const authHeader = req.headers.authorization;
if(authHeader) {
const token = authHeader.split(' ')[1];

jwt.verify(token, secretKey, (err,user) => {
if(err) {
return res.sendStatus(403);
}
req.user = user;
next();
})
} else {
res.sendStatus(401);
}
}

app.post('/admin/signup', (req, res) => {
// logic to sign up admin
const admin = req.body;
const existingAdmin = ADMINS.find(a => a.username === admin.username);
if(existingAdmin) {
res.status(403).json({message: 'Admin already exists'});
} else {
ADMINS.push(admin);
const token = generateJwt(admin);
res.json({message: 'Admin created successfully', token});
}
});

app.post('/admin/login', (req, res) => {
// logic to log in admin
const {username, password} = req.headers;
const admin = ADMINS.find(a => a.username === username && a.password === password);
if(admin) {
const token = generateJwt(admin);
res.json({message: 'Logged in successfully', token});
} else {
res.status(403).json({message: 'Admin authentication failed'});
}
});

app.post('/admin/courses', (req, res) => {
// logic to create a course
app.post('/admin/courses', authenticateJwt, (req, res) => {
const course = req.body;
course.id = COURSES.length + 1;
COURSES.push(course);
res.json({message: 'Course created successfully', courseId: course.id});
});

app.put('/admin/courses/:courseId', (req, res) => {
// logic to edit a course
app.put('/admin/courses/:courseId', authenticateJwt, (req, res) => {
const courseId = parseInt(req.params.courseId);

const course = COURSES.find(c => c.id === courseId);
if(course) {
Object.assign(course,req.body);
res.status(200).json({message: 'Course updated successfully'})
} else {
res.status(403).json({message: 'courseId does not exists'});
}
});

app.get('/admin/courses', (req, res) => {
// logic to get all courses
app.get('/admin/courses', authenticateJwt, (req, res) => {
res.json({ courses: COURSES });
});

// User routes
app.post('/users/signup', (req, res) => {
// logic to sign up user
const user = req.body;
const existingUser = USERS.find(u => u.username === user.username);
if (existingUser) {
res.status(403).json({ message: 'User already exists' });
} else {
USERS.push(user);
const token = generateJwt(user);
res.json({ message: 'User created successfully', token });
}
});

app.post('/users/login', (req, res) => {
// logic to log in user
const { username, password } = req.headers;
const user = USERS.find(u => u.username === username && u.password === password);
if (user) {
const token = generateJwt(user);
res.json({ message: 'Logged in successfully', token });
} else {
res.status(403).json({ message: 'User authentication failed' });
}
});

app.get('/users/courses', (req, res) => {
// logic to list all courses
app.get('/users/courses', authenticateJwt, (req, res) => {
res.json({ courses: COURSES });
});

app.post('/users/courses/:courseId', (req, res) => {
// logic to purchase a course
app.post('/users/courses/:courseId', authenticateJwt, (req, res) => {
const courseId = parseInt(req.params.courseId);
const course = COURSES.find(c => c.id === courseId);
if (course) {
const user = USERS.find(u => u.username === req.user.username);
if (user) {
if (!user.purchasedCourses) {
user.purchasedCourses = [];
}
user.purchasedCourses.push(course);
res.json({ message: 'Course purchased successfully' });
} else {
res.status(403).json({ message: 'User not found' });
}
} else {
res.status(404).json({ message: 'Course not found' });
}
});

app.get('/users/purchasedCourses', (req, res) => {
// logic to view purchased courses
app.get('/users/purchasedCourses', authenticateJwt, (req, res) => {
const user = USERS.find(u => u.username === req.user.username);
if (user && user.purchasedCourses) {
res.json({ purchasedCourses: user.purchasedCourses });
} else {
res.status(404).json({ message: 'No courses purchased' });
}
});

app.listen(3000, () => {
Expand Down
116 changes: 97 additions & 19 deletions week-3/02-course-app-easy/index.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,48 +7,126 @@ let ADMINS = [];
let USERS = [];
let COURSES = [];

const adminAuthentication = (req, res, next) => {
const {username, password} = req.headers;

const validAdmin = ADMINS.find(a => a.username === username && a.password === password);
if(validAdmin) {
next();
} else {
res.status(403).json({message: 'Admin authentication failed'});
}

}

const userAuthentication = (req, res, next) => {
const {username, password} = req.headers;

const validUser = USERS.find(u => u.username === username && u.password === password);
if(validUser) {
req.user = validUser; // add user object to the request.
next();
} else {
res.status(403).json({message: 'User authentication failed'});
}

}

// Admin routes
app.post('/admin/signup', (req, res) => {
// logic to sign up admin
const admin = req.body;
const adminAlreadyExists = ADMINS.find(a => a.username === admin.username);

if(adminAlreadyExists) {
res.status(403).json({message: 'Admin already exists'});
} else {
ADMINS.push(admin);
res.status(200).json({message: 'Admin created successfully'});
}

});

app.post('/admin/login', (req, res) => {
// logic to log in admin
app.post('/admin/login', adminAuthentication, (req, res) => {
res.status(200).json({message: 'Admin Logged in successfully'});
});

app.post('/admin/courses', (req, res) => {
// logic to create a course
app.post('/admin/courses', adminAuthentication, (req, res) => {
const course = req.body;
course.id = Math.floor(Math.random() * 100) + 1;

COURSES.push(course);
res.status(200).json({message: 'Course created successfully,', courseId: course.id});

});

app.put('/admin/courses/:courseId', (req, res) => {
// logic to edit a course
app.put('/admin/courses/:courseId', adminAuthentication, (req, res) => {
const courseId = parseInt(req.params.courseId);
const course = COURSES.find(c => c.id === courseId);
if(course) {
Object.assign(course, req.body);
res.status(200).json({message: 'Course updated successfully'})
} else {
res.status(403).json({message: 'courseId does not exists'});
}
});

app.get('/admin/courses', (req, res) => {
// logic to get all courses
app.get('/admin/courses', adminAuthentication, (req, res) => {
res.json({courses: COURSES});
});

// User routes
app.post('/users/signup', (req, res) => {
// logic to sign up user
const user = {
username: req.body.username,
password: req.body.password,
purchasedCourses: []
}
const userAlreadyExists = USERS.find(u => u.username === user.username);

if(userAlreadyExists) {
res.status(403).json({message: 'User already exists'});
} else {
USERS.push(user);
res.status(200).json({message: 'User created successfully'});
}
});

app.post('/users/login', (req, res) => {
// logic to log in user
app.post('/users/login', userAuthentication, (req, res) => {
res.status(200).json({message: 'User Logged in successfully'});
});

app.get('/users/courses', (req, res) => {
// logic to list all courses
app.get('/users/courses', userAuthentication, (req, res) => {
let filteredCourses = [];
for(let i = 0; i < COURSES.length; i += 1) {
if(COURSES[i].published) {
filteredCourses.push(COURSES[i]);
}
}
res.json({courses: filteredCourses});
});

app.post('/users/courses/:courseId', (req, res) => {
// logic to purchase a course
app.post('/users/courses/:courseId', userAuthentication, (req, res) => {
let courseId = parseInt(req.params.courseId);
const course = COURSES.find(c => c.id === courseId && c.published);
if(course) {
req.user.purchasedCourses.push(courseId);
res.status(200).json({ message: 'Course purchased successfully' });
} else {
res.status(404).json({ message: 'Course not found or not available' });
}
});

app.get('/users/purchasedCourses', (req, res) => {
// logic to view purchased courses
app.get('/users/purchasedCourses', userAuthentication, (req, res) => {
var purchasedCourseIds = req.user.purchasedCourses;
var purchasedCourses = [];
for(let i = 0; i < COURSES.length; i += 1) {
if(purchasedCourseIds.indexOf(COURSES[i].id) != -1) {
purchasedCourses.push(COURSES[i]);
}
}
res.json({ purchasedCourses });
});

app.listen(3000, () => {
console.log('Server is listening on port 3000');
});
});
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