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Dash Platform User

Library for retrieving Dash Platform users and their properties.

Note: this is an experimental library to support dapp sample investigation of Dash Platform usage - not for production use.

Prerequisites

In the browser, the library requires DashJS as an EXTERNAL dependency to create a connection to the platform, so you can either pass an existing instance of a DashJs client or the DashJS Library this must be referenced BEFORE the Dash Platform User library.

<script src="https://unpkg.com/dash"></script>
<script src="dash-platform-user.js" type="text/javascript"></script>

Please see the examples below for sample usage

Usage

Browser

Include the dash-platform-user-lib.js script file available from the releases page.

Nodejs

npm i dash-platform-user

DashPlatformUser.findByName

See also the examples in the auto-generated documentation below.

This is an asynchronous static function. It can act as a factory function to return instance(s) of DashPlatformUser class, but by default results are returned as objects.

The function has two parameters:

query

This is the name or names to be found. You can search for a single user or an array of users. It is possible to pass user level options by passing the user query as an object in the format {name: [string], options:[object]}. The only currently supported user level option is returnPrivateKey. This is a boolean (false by default) which returns the private key associated with identity at identity index 0, key 0, stored in the wallet for which mnemonic is passed with the client or client options in the functions second parameter.

For example, the following are valid arguments for the query parameter:

  • 'bob'
  • ['bob','alice']
  • {name:'alice', { returnPrivateKey: false }
  • [{name:'alice', options:{ returnPrivateKey: false }}, {name:'bob',options: { returnPrivateKey: false }}]
  • [{ name: 'alice', options: { returnPrivateKey: true } }, 'bob', 'nob'] (requires a client or connection options with a mnemonic to be passed as the second argument)

options

option property type values description
client object DashJS client an instance of a dash js client
connection_options object Dash JS Connection options options for a client instantiated internally by the library
returnType enum returnTypes.OBJECT (default), returnTypes.JSON, returnTypes.INSTANCE A enum which is the result of the static function DashPlatformUser.returnTypes(), signifying how the query results are formatted
returnAllRecords boolean false (default), true If this option is set to true, the full document history for each name is returned in an array (not currently a possibility). If false (default) only the current record / registration is returned as an object

return signature

In short you get back what you pass in! If you query an array of users (strings, objects or both) the query result will be an array of objects, for a single user a single object. The results for each query will be an object representing the current registration/ownership of the username, unless you pass in the option options.returnAllRecords, which will return the full registration history for the username (Currently name transfers are not possible and so in reality there will only ever be one result in the array)

Use with dash secure message library

This libray can be used to retrieve the private and public keys for users in order to use the ECIES encryption functions for secure messaging in the Dash Secure Message library: example below. For more details see github and the npm registry

[The following documentationm is automatically generated]

Documentation

Table of Contents

DashPlatformUser

DashPlatformUser class - represents a registered Dash Platform Username

Properties

  • id string Unique id fopr the user record - the id of the DPNS document which registered the name
  • name string The registered username
  • identityId string identityId associated with the username
  • identity Object full identity object of the identityId
  • publicKey string private Key Associated wwith the user identity
  • privateKey string private Key Associated wwith the user identity

Examples

const Dash = require("dash");
const DashPlatformUser = require("dash-platform-user");
const DashSecureMessage = require("dash-secure-message");

(async () => {
try {

//test data for retriveing private keys (subject to change)
const aliceMnemonic = 'shoe utility void sauce grocery tourist upon dress else deliver boy theory';
const bobMnemonic = 'fantasy normal viable flock chief ancient crunch member cross air charge lunch';

// USING QUERY LEVEL (TOP LEVEL) OPTIONS

// pass an instance of the client
const client = new Dash.Client({
wallet: { mnemonic: aliceMnemonic }
});

const options1 = { client: client, returnType: DashPlatformUser.returnTypes.JSON };

//pass connection parameter options
const options2 = {
connection_options:
{ network: 'testnet', }
};

//pass a mnemonic to retrieve private key
const options3 = {
connection_options:
{ wallet: { mnemonic: aliceMnemonic } }
//client: client, returnType: DashPlatformUser.returnTypes.JSON 
}


// QUERIES WITHOUT QUERY LEVEL (TOP LEVEL) OPTIONS
// THE TOP LEVEL OPTIONS ABOVE CAN BE PASSED As A SECOND PARAMETER

// if setting options.returnPrivateKey:true as a user level option, the wallet.mnemonic must be passed in 
// either the client instance or as connection_options.mnemonic

// - * dashjs is required as an external dependency if client instance is not passed as a top level option * 
// - create internal client connection (to testnet) using default seeds, apps & other options
// - outputs user result as returnType: Object (DashPlatformUser.returnTypes.OBJECT) 

let foundUser = '';

//UNCOMMENT EXAMPLES TO TEST

// Different Query Types (No options)
// Single user as string
foundUser = await DashPlatformUser.findByName('bob');

// Single user as object (with user level options)
//foundUser = await DashPlatformUser.findByName({name:'alice', { returnPrivateKey: false });

// Array of string queries
//foundUser = await DashPlatformUser.findByName(['bob','alice']);

// Array of Object queries 
//foundUser = await DashPlatformUser.findByName([{name:'alice', options:{ returnPrivateKey: false }}, {name:'bob',options: { returnPrivateKey: false }}]);

// Single user string passed as an array
//foundUser = await DashPlatformUser.findByName('bob');

// Array of mixed String and Object queries 
//foundUser = await DashPlatformUser.findByName([{ name: 'alice', options: { returnPrivateKey: true } }, 'bob', 'nob'], options3);

//user doesn't exist:
//single user
//foundUser = await DashPlatformUser.findByName('nob');

// array of strings with a non-existant user
//foundUser = await DashPlatformUser.findByName(['bob', 'nob']);

console.dir(foundUser);

//ENCRYPTION EXAMPLE USING Dash Secure Message Library

const msg = "test"
let keys = {};

const senderGetsKeys = await DashPlatformUser.findByName([{ name: 'alice', options: { returnPrivateKey: true } }, 'bob'],
{ connection_options: { wallet: { mnemonic: aliceMnemonic } } });

senderGetsKeys.map(u => {
if (u.query == 'alice') keys.senderKey = u.results.privateKey;
if (u.query == 'bob') keys.recipientKey = u.results.publicKey;
})

console.dir(JSON.stringify(keys));

const encrypted = DashSecureMessage.encrypt(keys.senderKey, msg, keys.recipientKey);

console.log('encrypted message:', encrypted)

const recipientGetsKeys = await DashPlatformUser.findByName([{ name: 'bob', options: { returnPrivateKey: true } }, 'alice'],
{ connection_options: { wallet: { mnemonic: bobMnemonic } } });

recipientGetsKeys.map(u => {
if (u.query == 'bob') keys.recipientKey = u.results.privateKey;
if (u.query == 'alice') keys.senderKey = u.results.publicKey;
})

console.dir(JSON.stringify(keys));

const decrypted = DashSecureMessage.decrypt(keys.recipientKey, encrypted, keys.senderKey);
console.log('decrypted message:', decrypted)

}
catch (e) {
console.log(`error: ${e}`);
}
}
)()

id

Parameters

name

Parameters

identityId

Parameters

identity

Parameters

  • newIdentity
  • newIdentityId Object

publicKey

Parameters

privateKey

Parameters

findByName

Finds the registered username on the network

Parameters

  • query (string | Object | Array<({string} | {Object})>) Either: For a single user query,either- a single string containing a username, or
    • an single object with properties of name and options to apply to the query for that user OR For a multiple user query
    • an array with a combination of the above
  • options Object Optional dashjs client. If the object is not passed it will be constructed by the function.

returnTypes

Enum for returnType

Type: number

returnTypes

Enum for returnType

Type: number

OBJECT

return as a plain object

JSON

return as a json string

INSTANCE

return as an instance of DashPlatformUser class (exposes internal private properties)

DashUser#toObj

Casts the DashPlatformUser instance to JSON string format ////

Parameters

  • instance Object An instance of DashPlatformUser

Returns Object

DashConnection

DashConnection class - represents a connection to Dash Platform

Properties

  • network string Network to connect to i.e. 'testet' (default), mainnet
  • mnemonic string Account mnemonic to use for the connection
  • apps Object named app identities
  • seeds Object additonal options, overrides other paramaters
  • client Object the connection instance client

connect

Intialises connection

disconnect

Closes and disconnect the connection

network

Parameters

mnemonic

Parameters

apps

Parameters

client

Parameters

  • newClient any

DataDocument

DataDocument class - represents data docuemnts sumitted to or retrieved from Dash Platform

Properties

  • dataContractId string dataContractId the document is validated against
  • ownerId string identityId of the owner / submitter of the document
  • data JSON actual data of the document represented as JSON
  • signature string the signature on the document

submit

submits the document instance using the passed in connection

Parameters

  • connection A DashJS client containing the account and keys for signing the doc

dataContractId

Parameters

id

Parameters

ownerId

Parameters

data

Parameters

find

finds one of more documents based on suplied query params

Parameters

  • client string A DashJS client, with options set for the locator of the docs to be retrieved
  • locator string The document name
  • query object Object containing array of query parameters

Returns Array array of found docuemnts

waitFor

Calls find() over specified period at specifed frequency until result tis returned

Parameters

  • connection string A DashJS connection, with options set for the locator of the docs to be retrieved
  • locator string The document name
  • query Object Object containing array of query parameters
  • timeout number Number of millseconds until rejecting as timed out
  • frequency number Frequency of calls to find() in millisenconds

Returns Promise<Object> promise for JSON Object {success:true, data:array of found docuemnts} if resolved {error: true, message:[error message]} if rejected

License

MIT License

Development

To develop this library:

The source file is src/dash-platform-user.js

  • build output

    npm run build

  • test with webpack dev server

    npm start

  • update documentation (requires npm documentation package installed globally: npm i -g documentation)

Update the Documentation section of the README.md file

npm run docs:readme

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