Slack JS

Slack JS is a JavaScript library for sending SLACK transactions.

Installation

Building

Build the browserify module for client use:

npm build:browserify

Clean:

npm clean:browserify

Tests

npm test

Tests written using mocha + schedule.js.

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Usage

On the client:

<script src="node_modules/slackjs/bundle.min.js"></script>

On the server:

var slack = require("slackjs");

Generating a key pair

To generate a public / private key pair from a given passphrase:

var keys = slack.crypto.getKeys("passphrase");

Returning:

{
  publicKey: "02e012f0a7cac12a74bdc17d844cbc9f637177b470019c32a53cef94c7a56e2ea9",
  privateKey: ""
}

To get the private key:

keys.d.toBuffer().toString("hex");

Returning:

1e089e3c5323ad80a90767bdd5907297b4138163f027097fd3bdbeab528d2d68

Generating an address

To generate a unique Slack address from a given public key:

var address = slack.crypto.getAddress("5d036a858ce89f844491762eb89e2bfbd50a4a0a0da658e4b2628b25b117ae09");

Returning:

AGihocTkwDygiFvmg6aG8jThYTic47GzU9

Creating a transaction

To create a signed transaction object, which can then be broadcasted onto the network:

var amount      = 1000 * Math.pow(10, 8); // 100000000000
var transaction = slack.transaction.createTransaction("AGihocTkwDygiFvmg6aG8jThYTic47GzU9", amount, null, "passphrase", "secondPassphrase");

Returning:

{
  type: 0, // Transaction type. 0 = Normal transaction.
  amount: 100000000000, // The amount to send expressed as an integer value.
  asset: {}, // Transaction asset, dependent on tx type.
  fee: 100000000, // 0.1 SLACK expressed as an integer value.
  id: "500224999259823996", // Transaction ID.
  recipientId: "AGihocTkwDygiFvmg6aG8jThYTic47GzU9", // Recipient ID.
  senderPublicKey: "56e106a1d4a53dbe22cac52fefd8fc4123cfb4ee482f8f25a4fc72eb459b38a5", // Sender's public key.
  signSignature: "03fdd33bed30270b97e77ada44764cc8628f6ad3bbd84718571695262a5a18baa37bd76a62dd25bc21beacd61eaf2c63af0cf34edb0d191d225f4974cd3aa509", // Sender's second passphrase signature.
  signature: "9419ca3cf11ed2e3fa4c63bc9a4dc18b5001648e74522bc0f22bda46a188e462da4785e5c71a43cfc0486af08d447b9340ba8b93258c4c7f50798060fff2d709", // Transaction signature.
  timestamp: 27953413 // Based on UTC time of genesis since epoch.
}

Network identification with Nethash

You need to obtain the nethash in order to be sure you are broadcasting to the right network (testnet, mainnet or others). The nethash is simply the payload hash from the genesisBlock. If no nethash or wrong nethash is provided in the headers, the request will be rejected returning the expected nethash.

{ "success": false, "message": "Request is made on the wrong network", "expected":"e2f8f69ec6ab4b12550a314bd867c46e64e429961bb427514a3a534c602ff467", "received":"wrong-nethash" }

The nethash for a given network can be obtained at the following API endpoint:

/api/blocks/getNetHash

You can also get the nethash from a peer this way:

On the client using jQuery:

var nethash;
$.ajax({
  url: "https://api.slacknode.net/peer/transactions/",
  data: JSON.stringify({}),
  dataType: "json",
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "os": "linux3.2.0-4-amd64",
    "version": "0.3.0",
    "port": 1,
    "nethash": "wrong-nethash"
  },
  success: function(data) {
    nethash = data.body.expected;
  }
});

From a server using Request:

var nethash;
request({
  url: "https://api.slacknode.net/peer/transactions",
  json: { },
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "os": "linux3.2.0-4-amd64",
    "version": "0.3.0",
    "port": 1,
    "nethash": "wrong-nethash"
  }
}, function(error, response, body) {
    nethash = body.expected;
  });

Posting a transaction

Transaction objects are sent to /peer/transactions, using the POST method.

Example:

Method: POST
Content-Type: application/json

{
    "transactions" : [{
        ...
    }]
}

Sending transaction on the Client

Using jQuery:

var success = function(data) {
  console.log(data);
};

$.ajax({
  url: "https://api.slacknode.net/peer/transactions",
  data: JSON.stringify({ transactions: [transaction] }),
  dataType: "json",
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "os": "linux3.2.0-4-amd64",
    "version": "0.3.0",
    "port": 1,
    "nethash":nethash
  },
  success: success
});

Sending transaction on the Server

Using Request:

var request = require("request");

var callback = function(error, response, body) {
  console.log(error || body);
};

request({
  url: "https://api.slacknode.net/peer/transactions",
  json: { transactions: [transaction] },
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "os": "linux3.2.0-4-amd64",
    "version": "0.3.0",
    "port": 1,
    "nethash": nethash
  }
}, callback);

Peer Response

Upon successfully accepting a transaction, the receiving node will respond with:

{ "success": true, "result": "5318121831703437738" }

If the transaction is deemed invalid, or an error is encountered, the receiving node will respond with:

{ "success": false, "message": "Error message" }

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Other transaction types

Creating a delegate transaction

var transaction = slack.delegate.createDelegate("secret", "username", "secondSecret");

Creating a second signature transaction

var transaction = slack.signature.createSignature("secret", "secondSecret");

Creating a vote transaction

var transaction = slack.vote.createVote("secret", ["+58199578191950019299181920120128129"], "secondSecret");

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