tweeter

Tweeter - is a full stack application fully written in Rust programming language.

Description

As you may understand from it’s name, this project is a small and simple copy of twitter platform with using some of the ideas from web3 technologies.

Authentication

Authentication, as in most decentralized or web3 applications, is based on asymmetrical encryption, or simply on pair of public and private keys, with which you should encrypt some data and in appropriate way send it to endpoint as kind of a auth token.

Algorithm is ECDSA.

NOTE: all keys are encrypted by base58 algorithm

Craber token

Is a type of token that is used in auth system in this project. It consists of three parts:

• current timestamp
• public key
• first two parts encrypted with private key divided by . symbol

For example, if 1661410640 - is a timestamp and 21jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2 - is a user’s public key, the craber token may look like this:

1661410640.21jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2.381yXYun2JcGVy4q1K5EHQfV3KdNNxxT4by8mc81SsP6W2JxKxz4jVAhPzquA6TMN28kwzeJoDfdGWvp64DmfPNyVCC3WeGN

Where 381yXYun2JcGVy4q1K5EHQfV3KdNNxxT4by8mc81SsP6W2JxKxz4jVAhPzquA6TMN28kwzeJoDfdGWvp64DmfPNyVCC3WeGN is an encrypted with private key text: 1661410640.21jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2

This token must be sent in Authorization HTTP header with Craber {{craber token}} schema as a value.

Database structure

The database structure is actually a blockchain, which will explained below in Tweet structure description.

Tweet

Tweet is simple structure that contains of:

• text (max length is 256 symbols)
• timestamp of tweet creation
• public key of a user that created this tweet
• signature
• hash

Signature

Signature is a signed content of tweet (except signature of course) divided by newline symbol.

For example, if tweet’s text is Hello, world!, timestamp - 1661410640, and public key - 21jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2, the content to sign will be:

Hello, world!
166141064
21jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2

Hash

Hash field is a string that is created by hashing with sha3 algorithm all of the tweet fields, including it’s id, signature and the hash of last added to blockchain tweet.

{{id}}{{text}}{{timestamp}}{{user's public key}}{{signature}}{{last tweet's hash}}

For example, if take content from Signature and tweet’s id is 123, and hash of last hashed tweet is ksjhdfkjahsdkfhaskdhfkjsahdfkskdhfksadhf, to create current tweet’s hash you need to hash:

123Hello, world!16614106421jjUWrgNtNUEVYq2eNa9h1Vuz9m8UkPQ2pZByxY4k1C2ksjhdfkjahsdkfhaskdhfkjsahdfkskdhfksadhf

Hash field is an optional field, what means that if hash field in not presented in tweet the current one is still not added to blockchain.