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BlockController.js
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BlockController.js
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const SHA256 = require('crypto-js/sha256');
const BlockClass = require('./Block.js');
const BlockChain = require('./BlockChain.js');
const Mempool = require('./memPool.js');
const hex2ascii = require('hex2ascii');
/**
* Controller Definition to encapsulate routes to work with blocks
*/
class BlockController {
/**
* Constructor to create a new BlockController, you need to initialize here all your endpoints
* @param {*} app
*/
constructor(app) {
this.app = app;
this.blockChain = new BlockChain.Blockchain();
this.memPool = new Mempool.Mempool();
this.getBlockByIndex();
this.postNewBlock();
this.postValidationRequest();
this.messageSignatureValidation();
this.postBlock();
// this.starRequestValidation();
this.getStarBlockByHash();
this.getBlockByWalletAddress();
this.getStarBlockByHeight();
//this.initializeMockData();
}
/**
* Implement a GET Endpoint to retrieve a block by index, url: "/api/block/:index"
*/
getBlockByIndex() {
let self = this;
this.app.get("/api/block/:blockHeight", (req, res) => {
return self.blockChain.getBlock(req.params.blockHeight).then(result => {
res.set({'Connection': 'close'});
res.status(200).json(JSON.parse(result));
res.end();
}, error => {
res.status(404).send('Block not found!\n\n');
});
});
}
/**
* Implement a POST Endpoint to add a new Block, url: "/api/block"
*/
postNewBlock() {
let self = this;
this.app.post("/api/block", (req, res) => {
if (req.body.body) {
return self.blockChain.addBlock(new BlockClass.Block(req.body.body)).then(result => {
res.status(201).json( JSON.parse(result) );
}, error => {
res.status(500).send('Uknown error occurred on server side. Please retry later.\n\n')
})
} else {
res.status(403).send('Block data must not be empty - please resend request with json object containing desired block data.\n\n')
}
});
}
// Post validation request
postValidationRequest() {
let self = this;
self.app.post("/requestValidation", (req, res) => {
self.memPool.addRequestValidation(req)
.then(result => {
return res.status(201).json( result );
});
})
}
messageSignatureValidation(){
let self = this;
this.app.post("/message-signature/validate", (req, res) => {
self.memPool.validateWalletSignature(req)
.then(result => {
return res.status(201).json( result )
}).catch(err => {
console.log(err);
res.status(403).send('Message signature invalid. Please resend correct message signature.')})
})
}
postBlock(){
let self = this;
this.app.post('/block/', (req, res) => {
if (req.body.length){
res.status(403).send("You sent " + req.body.length + " stars. Only one star per request is allowed!");
} else {
let story = req.body.star.story;
let words = story.match(/\S+/g).length;
if (words > 250){
res.status(403).send("You sent more than 250 words!");
}
}
let isDataThere = self.memPool.validateAddressRequest(req.body.address) && req.body.star.ra && req.body.star.dec && req.body.star.story;
if (isDataThere) {
let body = {
address: req.body.address,
star: {
ra: req.body.star.ra,
dec: req.body.star.dec,
story: new Buffer.from(req.body.star.story).toString('hex')
}
}
self.blockChain.addBlock(new BlockClass.Block(body))
.then(result => {
result.body.star.storyDecoded = hex2ascii(result.body.star.story);
console.log(result)
res.status(201).json( result )
}).catch(err => {
res.status(403).send('Star block could not be created at this time. Please attempt addition at a later time.')
})
} else {
return res.status(403).send('Error: submitted wallet address has not been validated for star registry or star data not included in star addition request.')
}
})
}
getStarBlockByHash() {
let self = this;
this.app.get('/stars/hash/:hash', (req, res) => {
self.blockChain.getBlockByHash(req.params.hash)
.then(result => {
if (result !== null) {
result.body.star.storyDecoded = hex2ascii(result.body.star.story);
res.status(200).json( result );
} else {
throw new Error;
}
}).catch(err => {
res.status(403).send(`Star block with hash: "${req.params.hash}" not found`)
})
})
}
getBlockByWalletAddress() {
let self = this;
this.app.get('/stars/address/:address', (req, res) => {
self.blockChain.getBlockByWalletAddress(req.params.address)
.then(result => {
if (result.length > 0) {
for (let i = 0; i < result.length; i++) {
result[i].body.star.storyDecoded = hex2ascii(result[i].body.star.story);
}
res.status(200).json( result );
} else {
throw new Error;
}
}).catch(err => {
res.status(403).send(`No star block with wallet address ${req.params.address} found`)
})
})
}
getStarBlockByHeight() {
let self = this;
this.app.get('/block/:height', async (req, res) => {
let blockHeight = await self.blockChain.getBlockHeight();
if (blockHeight == 1) {
res.status(403).send('Only Genesis Block exists in blockchain. Cannot retrieve star data.')
} else if (!(req.params.height > 0)) {
res.status(403).send('Cannot retrieve star data from Genesis Block.');
} else {
self.blockChain.getBlock(req.params.height)
.then((result) => {
result.body.star.storyDecoded = hex2ascii(result.body.star.story);
res.status(200).json( result );
}).catch(err => {
res.status(403).send(`Error occurred when trying to obtain star block #${req.params.height}`);
})
}
})
}
/*
* Help method to inizialized Mock dataset, adds 10 test blocks to the blocks array
async initializeMockData() {
let blockHeight = await this.blockChain.getBlockHeight();
if(blockHeight === 0){
for (let index = 1; index < 10; index++) {
let blockAux = new BlockClass.Block(`Test Data #${index}`);
blockAux.height = index;
blockAux.hash = SHA256(JSON.stringify(blockAux)).toString();
await this.blockChain.addBlock(blockAux);
}
}
}
*/
}
/**
* Exporting the BlockController class
* @param {*} app
*/
module.exports = (app) => { return new BlockController(app);}