Blockchain connector is deprecated - please use Squeezer ChainKit

squeezer-blockchain-connector

Agnostic blockchain connector

The main scope for adding the connector is to unify all the current blockchains data assets into a single normalized API interface , therefore you can build blockchain apps easily without digging into all blockchain infrastructures

Basically the connector is only a client for the Squeezer Blockchain Gateway where actually all the magic happens.

Check the Squeezer Blockchain Gateway API Documentation:

Squeezer Blockchain Gateway - Test

Squeezer Blockchain Gateway - Production (in development)

Watch Video tutorial

Table of contents

• Install
• ITN ( Instant Transaction Notification )
• Initialize
• Wallet types
• Create Wallet
• Send transaction
• Transactions
• Get balance
• Smart contract

Install

npm install squeezer-blockchain-connector --save

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Initialize

You will need a Squeezer access key in order to use the blockchain connector. You can get one here

const BlockchainConnector = require('squeezer-blockchain-connector');
const blockchainConnector = new BlockchainConnector(options); 

• options required
• options.accessKey - required Squeezer access key
• options.environment - required use test for sandbox or live for production

ITN ( Instant Transaction Notification )

---

The ITN system will notify your server when you receive a transaction and when a transaction status changes. This is a quick and useful way to integrate blockchain transactions processing.

Please check the Squeezer Blockchain Gateway API Documentation-> Configure ITN callback url

ITN JSON object:

{
  "from": "0xc03f7B9bddF8aeeBCbA2f818E5f873f71b85EB5c",
  "to": "0x903f7B9bddF8aeeBCbA2f818E5f873f71b85EB5c",
  "amount": "0.99999999",
  "type": "in",
  "currency": "ETH",
  "accessKeyHash": "accessKeyHash",
  "hash": "0xcf387e8d1a95bd3a5b54269aa0a228...",
  "block": "891093",
  "status": 1,
  "itnStatus": 1,
  "createdAt": "2018-05-13 18:09:18",
  "updateAt": "2018-05-13 18:09:18"
}

NOTE: As a security measure please make sure that you validate accessKeyHash is the same at with your default access key

Validate accessKeyHash example:

if (accessKeyHash === crypto.createHmac('SHA256', accessKey).update(accessKey).digest('hex')) {
  console.log('valid access key hash') 
} else {
  console.log('invalid access key hash')
}

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Wallet types

Get current available blockchain wallet types

blockchainConnector.walletTypes(callback)

• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.walletTypes((err, response) => {
  console.log(response)
});

Example response from server

{
  "message":"success",
  "data":[
    {
      "type":"ETH",
      "info":"Ethereum wallet."
    },
    {
      "type":"BTC",
      "info":"Bitcoin wallet."
    },
    {
      "type":"BTC",
      "info":"Bitcoin wallet."
    }
  ]
}

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Create wallet

Create a new blockchain wallet.

blockchainConnector.createWallet(options, callback)

• options - required.
• options.type - required. Wallet type (ETH).
• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.createWallet({
  type: 'ETH'
}, (err, response) => {
  console.log(response)
});

Example response from server

{
  "walletId": "8193d025-6430-496e-abf3-88f06b51889c",
  "address": "0xbd61ef790C3eaf4D0c4D4bE3558F8a501863525f",
  "token": "41dbecfb0454183a4c7a9be8b874e1785b5..."
}

NOTE: Squeezer will not store any sensitive data similar to token. For later usage please store the wallet details on a secure & safe environment.

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Send transaction

Initiate a new blockchain transaction.

blockchainConnector.sendTransaction(options, callback)

• options - required.
• options.amount - required. Amount to send, 8 decimal max. (0.01).
• options.type - required. Transaction type. (ETH).
• options.to - required. Receiver's address
• options.token - required. Wallet token
• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.sendTransaction({
  amount: 0.01,
  type: 'ETH',
  to: '0x207E1a4F3Ab910D2164bC3646CFD0aF697f86713',
  token: "41dbecfb04541........"
}, (err, response) => {
  console.log(response)
});

Example response from server

{
  "hash" : "0x4b9c1358fcbeb5434457355e3e8e44e10ebc6bec02d40c7a28046b1cfef99476"
}

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Get transactions

Get transactions for a specific wallet

blockchainConnector.getTransactions(options, callback)

• options - required.
• options.walletId - required. Wallet ID
• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.getTransactions({
  walletId: "0dbeb851-b9e7-42e4-a448-71f8520f1ea3",
}, (err, response) => {
  console.log(response)
});

Example response from server

{
  "message": "success",
  "data": [
    {
      "from": "0xc03f7B9bddF8aeeBCbA2f818E5f873f71b85EB5c",
      "to": "0x903f7B9bddF8aeeBCbA2f818E5f873f71b85EB5c",
      "amount": 0.99999999,
      "type": "in",
      "hash": "0xcf387e8d1a95bd3a5b54269aa0a228f159d3cd33fa9e946617c532c5cb8c77bb",
      "block": 891093,
      "status": 0,
      "itnStatus": 0,
      "createdAt": "2018-05-13 18:09:18",
      "updateAt": "2018-05-13 18:09:18"
    }
  ]
}

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Get balance

Get balance for a specific wallet

blockchainConnector.getBalance(options, callback)

• options - required.
• options.walletId - required. Wallet ID
• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.getBalance({
  walletId: "0dbeb851-b9e7-42e4-a448-71f8520f1ea3",
}, (err, response) => {
  console.log(response)
});

Example response from server

{
  "message":"success",
  "data": {
    "balance":0
  }
}

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Smart contract ( In development feature )

Access a smart contract

blockchainConnector.smartContract(options, callback)

• options - required.
• options.address - required. Smart contract address.
• options.type - required. Smart contract type. (ETH)
• options.abi - required. Abi code.
• options.methods - required. Smart contract methods.
• options.token - required. Wallet token
• callback - required callback function, accepts 2 values (error,result)

Example request

blockchainConnector.smartContract({
  type: 'ETH',
  abi : '',
  address: '0x207E1a4F3Ab910D2164bC3646CFD0aF697f86713',
  token: '348nagfgf45tgtg....',
  methods: [{
    listVotes: ['arg1', 'arg2'],
    votesType: ['positive']
  }]
}, (err, response) => {
  console.log(response)
});

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