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How would you create your own Instagram?

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Anjali Sharma answered on January 15, 2023 Popularity 9/10 Helpfulness 1/10

answer How would you create your own Instagram?

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How would you create your own Instagram?

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Before we jump into how the features work, let’s examine the minimum features needed to build an app like Instagram. When building clones of popular web apps such as social media platforms, it is important to include as many of the basic features that users expect as possible.

In order to get a running start on this project, you’ll want to have these core pages:

User profiles

Ability to follow friends and popular accounts

Feed of posts from the user and the accounts the user accounts they follow

Ability to like other users’ posts

Ability to comment on posts

Backendless’ free Instagram clone solution includes all of these features. You can customize the template itself, or use it as a blueprint for building similar pages in another app.

public class JwtTokenAuthenticationFilter extends OncePerRequestFilter {

    private final JwtConfig jwtConfig;

    public JwtTokenAuthenticationFilter(JwtConfig jwtConfig) {
        this.jwtConfig = jwtConfig;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws ServletException, IOException {

        // 1. get the authentication header. Tokens are supposed to be passed in the authentication header
        String header = request.getHeader(jwtConfig.getHeader());

        // 2. validate the header and check the prefix
        if(header == null || !header.startsWith(jwtConfig.getPrefix())) {
            chain.doFilter(request, response);  		// If not valid, go to the next filter.
            return;
        }

        // If there is no token provided and hence the user won't be authenticated.
        // It's Ok. Maybe the user accessing a public path or asking for a token.

        // All secured paths that needs a token are already defined and secured in config class.
        // And If user tried to access without access token, then he won't be authenticated and an exception will be thrown.

        // 3. Get the token
        String token = header.replace(jwtConfig.getPrefix(), "");

        try {	// exceptions might be thrown in creating the claims if for example the token is expired

            // 4. Validate the token
            Claims claims = Jwts.parser()
                    .setSigningKey(jwtConfig.getSecret().getBytes())
                    .parseClaimsJws(token)
                    .getBody();

            String username = claims.getSubject();
            if(username != null) {
                List<String> authorities = (List<String>) claims.get("authorities");

                // 5. Create auth object
                // UsernamePasswordAuthenticationToken: A built-in object, used by spring to represent the current authenticated / being authenticated user.
                // It needs a list of authorities, which has type of GrantedAuthority interface, where SimpleGrantedAuthority is an implementation of that interface
                UsernamePasswordAuthenticationToken auth =
                        new UsernamePasswordAuthenticationToken(username, null,
                                authorities
                                        .stream()
                                        .map(SimpleGrantedAuthority::new)
                                        .collect(toList()));

                // 6. Authenticate the user
                // Now, user is authenticated
                SecurityContextHolder.getContext().setAuthentication(auth);
            }

        }

https://backendless.com/create-your-own-free-instagram-like-app/

Popularity 9/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 15 2023

Anjali Sharma

0 Answers Avg Quality 2/10

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We will use Cassandra as Database and AWS CDN



Uses

two database systems for different use cases



Relational database

PostgreSQL and the other is N o SQL

database Cassandra



Uses

N o SQL Cassandra database for user stories



Uses

R elational PostgreSQL database for User Information

bio update

https://arunabhdas.com/infrastructure-scaling-case-study-instagram-5dd46a8d2974

Popularity 8/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: whatever whateve

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Contributed on Feb 21 2023

Pragya Keshap

0 Answers Avg Quality 2/10

How would you create your own Instagram?

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