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validation.js
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validation.js
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/* ===== level ===============================
| Configuration of the levelDB |
| ===========================================*/
const level = require('level');
const sessionDB = './sessiondata';
const db = level(sessionDB, { valueEncoding: 'json' });
class LevelDB {
// Add data to levelDB with key/value pair
addLevelDBData(address, value) {
return new Promise((resolve, reject) => {
db.put(address, value, (err) => {
if (err) reject(err);
db.get(address, (err, value) => {
if (err) reject(err);
resolve(value);
})
})
});
}
// Get data from levelDB with key
getLevelDBData(address) {
return new Promise((resolve, reject) => {
db.get(address, (error, value) => {
if (error) {
reject(error);
} else {
resolve(value);
}
});
});
}
remove(address) {
db.del(address);
}
}
const bitcoinMessage = require('bitcoinjs-message');
/* ===== StatusSignature Class ====================
| Class with a constructor for status signature |
| ===============================================*/
class StatusSignature {
constructor(address) {
this.address = address,
this.requestTimeStamp = Date.now(),
this.message = `${this.address}:${this.requestTimeStamp}:starRegistry`,
this.validationWindow,
this.messageSignature;
}
}
/* ===== RegisterStar Class =======================
| Class with a constructor for status star |
| ===============================================*/
class RegisterStar {
constructor(registerStatus, status) {
this.registerStar = registerStatus,
this.status = status;
}
}
class SessionValidation {
constructor() {
this.levelDB = new LevelDB();
}
resquestValidation(address) {
return this.levelDB.getLevelDBData(address).then(value => {
value.validationWindow = this.getValidationWindow(value.requestTimeStamp);
if (value.validationWindow < 0)
return this.addAddressToSession(address);
return value;
}).catch(e => {
if (e.type === 'NotFoundError')
return this.addAddressToSession(address);
throw new Error(e);
})
}
getValidationWindow(resquestTimeStamp) {
return Math.floor((resquestTimeStamp + (5 * 60 * 1000) - Date.now()) / 1000);
}
addAddressToSession(address) {
let statusSignature = new StatusSignature(address);
statusSignature.validationWindow = this.getValidationWindow(statusSignature.requestTimeStamp);
return this.levelDB.addLevelDBData(address, statusSignature).then(value => value);
}
isValidAddress(address) {
return this.levelDB.getLevelDBData(address).then(value => {
value.validationWindow = this.getValidationWindow(value.requestTimeStamp);
if (value.validationWindow >= 0 && value.messageSignature === 'valid') {
return true;
}
return false;
}).catch(() => false);
}
validate(payload) {
let verified = false;
return this.levelDB.getLevelDBData(payload.address).then(value => {
value.validationWindow = this.getValidationWindow(value.requestTimeStamp);
if (value.validationWindow < 0) {
value.validationWindow = 0
value.messageSignature = 'expired'
return new RegisterStar(verified, value);
}
try {
verified = bitcoinMessage.verify(value.message, payload.address, payload.signature);
} catch (e) {
verified = false;
}
value.messageSignature = verified ? 'valid' : 'invalid';
return this.levelDB.addLevelDBData(payload.address, value).then(value => {
return new RegisterStar(verified, value);
});
}).catch(() => {
throw new Error('Address not found.');
})
}
remove(address) {
this.levelDB.remove(address);
}
}
module.exports = { SessionValidation }