Notice: ILP kit does not support the new features introduced by ILPv4. Use moneyd to try out ILPv4.

ILP Kit

ILP wallet with hosted ledger and connector instances

Setup

• The easy way: with docker-compose
• On Google Cloud Engine: https://github.com/sappenin/ilpkit-google-cloud/tree/master/ilpkit-gce-single
• On Heroku: https://heroku.com/deploy?template=https://github.com/interledgerjs/ilp-kit/tree/release

Development

See https://github.com/interledgerjs/ilp-kit/blob/master/docs/DEV.md

Table of contents

• Environment variables
• Advanced Mode
• Architecture
  • Backend (REST API)
    • API docs
    • SPSP
      • Webfinger
  • Client
    • Using Redux DevTools
    • Theme Customization

Environment variables

Note: Most of the variables can either be set as environment variable or in a config file. The default config file is env.list. Environment variables take precedence over variables set in the config file.

Required

Name	Example	Description
API_HOSTNAME	wallet.com	API public hostname.
API_PORT	3000	API private port (used as both public and private port if API_PUBLIC_PORT is not specified).
DB_URI	postgres://localhost/wallet	URI for connecting to a database.
API_LEDGER_ADMIN_USER	admin	Ledger admin username.
API_LEDGER_ADMIN_PASS	pass	Ledger admin pass.
CLIENT_HOST	wallet.com	Publicly visible hostname.
CLIENT_PORT	4000	Client port.
LEDGER_ILP_PREFIX	wallet.	This is required if the API_LEDGER_URI is not specified

Optional

Name	Example	Description
API_CONFIG_FILE	custom-env.list	Specifies the path from which to load the config file. Needs to be defined as environment variable.
API_PRIVATE_HOSTNAME	localhost	Private API hostname.
API_PUBLIC_PORT		Api public port.
API_SECRET	qO2UX+fdl+tg0a1bYt	Api secret. Used to generate the session, oauth and condition secrets.
API_RELOAD	true	Turn on/off the reload endpoint.
API_LEDGER_URI	http://wallet.com:2000	Ledger URI: requests go to this uri (a ledger instance will be started by the wallet if this is not specified).
API_LEDGER_PUBLIC_URI	http://wallet.com/ledger	Ledger public URI (used in account URIs). Specified if different from the API_LEDGER_URI.
API_TRACK_GA	UA-XXXXX-X	Google Analytics Tracking ID.
API_TRACK_MIXPANEL		Mixpanel Tracking ID.
API_GITHUB_CLIENT_ID		Github application client id (used for github oauth).
API_GITHUB_CLIENT_SECRET		Github application client secret (used for github oauth).
API_MAILGUN_API_KEY		Mailgun api key (for sending emails).
API_MAILGUN_DOMAIN	wallet.com	One of the domains attached to the Mailgun account.
API_ANTIFRAUD_SERVICE_URL	antifraud.wallet.com	Anti fraud service url. This will enable an additional step in registration that asks for personal details
API_ANTIFRAUD_MAX_RISK	20	Maximum tolerable risk level for the registration
API_EMAIL_SENDER_NAME	info	Email sender name
API_EMAIL_SENDER_ADDRESS	[email protected]	Email sender address
API_REGISTRATION	true	Enable/Disable registration
WALLET_FORCE_HTTPS	true	Force all connections to use HTTPS.
WALLET_TRUST_XFP_HEADER	true	Trust the X-Forwarded-Proto header.
CONNECTOR_ENABLE	false	Run a connector instance
CLIENT_PUBLIC_PORT	80	Client public port (if different from CLIENT_PORT)
CLIENT_TITLE	ILP Kit	Browser title and logo

Default five-bells-ledger environment variables

(used if the API_LEDGER_URI is not specified). You can read more about these variables in the five-bells-ledger readme.

Name	Default
LEDGER_DB_URI	DB_URI
LEDGER_ADMIN_USER	API_LEDGER_ADMIN_USER
LEDGER_ADMIN_PASS	API_LEDGER_ADMIN_PASS
LEDGER_HOSTNAME	API_HOSTNAME
LEDGER_PORT	API_PORT + 1
LEDGER_PUBLIC_PORT	CLIENT_PORT
LEDGER_PUBLIC_PATH	ledger
LEDGER_CURRENCY_CODE	USD
LEDGER_CURRENCY_SYMBOL	$

Advanced Mode

ILP kit UI comes with an "advanced mode" for developers and advanced users. You can activate it with a hot-key: option+d on Mac or alt+d on Windows.

Architecture

ILP kit consists of:

• a Five Bells ledger (the 'ledger' process)
• a Node.js (developed on v7.7.1) 'api' process, containing a connector and SPSP receivers
• html+js+css statics, built using React
• an nginx instance for serving the html files and proxying requests to ledger and api

Backend (REST API)

The backend is responsible for communicating with the ILP ledger, creating accounts, sending payments and keeping the payment history.

API docs

• stable (release branch) - https://interledgerjs.github.io/ilp-kit/apidoc
• latest (master branch) - https://interledgerjs.github.io/ilp-kit/apidoc/master

How it works

The wallet implements SPSP for initiating and receiving payments.

This means it announces an SPSP address of the form user@host, and links this to two things:

• an ILP address (roughly of the form g.us.usd.host.user, but this is not enforced, and your ILP address is not a unique string)
• a cryptographic key pair, used indirectly to generate and fulfill crypto conditions.

The connector component can peer with other connectors on the Interledger, and basically acts as a router.

The ledger can handle payments that are conditional on a cryptographic condition, and that's where the power of ILP lies. When you send money to an account on another ledger, your connector conditionally pays the next connector, all the way to the receiving connector. The receiving connector adds a conditional payment to the receiving ledger, and the receiver (which lives in the API component) fulfills the crypto condition, using (a key which from) the receiver's public key.

Only the receiver of an Interledger payment can fulfill the crypto condition, and that's why you can be sure that the intermediate hops will all roll back if the money cannot be safely delivered.

Webfinger

Webfinger is used to lookup account/user identifiers.

Example request

curl -X GET
https://wallet.example/.well-known/webfinger?resource=acct:[email protected]

Example response

HTTP/1.1 200 OK
{
  "subject": "acct:[email protected]",
  "links": [
    {
      "rel": "https://interledger.org/rel/ledgerUri",
      "href": "https://red.ilpdemo.org/ledger"
    },
    {
      "rel": "https://interledger.org/rel/socketIOUri",
      "href": "https://red.ilpdemo.org/api/socket.io"
    },
    {
      "rel": "https://interledger.org/rel/ledgerAccount",
      "href": "https://red.ilpdemo.org/ledger/accounts/alice"
    },
    {
      "rel": "https://interledger.org/rel/sender/payment",
      "href": "https://red.ilpdemo.org/api/payments"
    },
    {
      "rel": "https://interledger.org/rel/sender/pathfind",
      "href": "https://red.ilpdemo.org/api/payments/findPath"
    },
    {
      "rel": "https://interledger.org/rel/spsp/v2",
      "href": "https://red.ilpdemo.org/api/spsp/alice"
    }
  ]
}

Client

The client is a web app built on React that implements user signup/signin, sending payments and payment history.

Client state management is handled by Redux.

Theme Customization

npm install generates a src/theme/variables.scss which contains the theme colors. You can manually edit it.

Database has two tables: Users and Payments.