Flyover SDK

Flyover SDK simplifies the integration between client applications and the components of the Flyover Protocol by providing an easy to use interface.

Installation

npm install @rsksmart/flyover-sdk

Usage

Create Flyover client instance

    const flyover = new Flyover({ network: 'Regtest'})

If you want, you can provide your own Regtest environment URL, if custom environment URL is not secure, then you must allow insecure connections

    const flyover = new Flyover({
        network: 'Regtest',
        customRegtestUrl: 'http://localhost:8080',
        allowInsecureConnections: true
    })

Then you can start doing operations with the client

    const providers = await flyover.getLiquidityProviders()
    flyover.useLiquidityProvider(providers.at(0))
    const quotes = await flyover.getQuotes({ /* QuoteRequest data... */ })
    const acceptedQuote = await flyover.acceptQuote(quotes.at(0))

You can read more about Flyover Protocol here or in its integration manual.

Configuration

This section explains one by one the fields required to configure the FlyoverSDK. A full FlyoverConfig object looks like this:

interface FlyoverConfig extends BridgesConfig {
  network: Network
  allowInsecureConnections?: boolean
  rskConnection?: BlockchainConnection
  customLbcAddress?: string
  customRegtestUrl?: string
  captchaTokenResolver: CaptchaTokenResolver
  disableChecksum?: boolean
}

• network: this is the name of the network your going to connect to. It can be any of the following:
  • Mainnet
  • Testnet
  • Regtest
  • Alphanet
  • Development However we advice to only use Mainnet or Testnet for integration purposes as they are the most stable ones.
• allowInsecureConnections: the FlyoverSDK may work with different liquidity provider servers, this this parameters helps to prevent the SDK of making requests to server that are not running over HTTPS. It is false by default.
• rskConnection: this parameter is the object representing the connection to the RSK network, it is not mandatory to initialize the SDK. For more information check Connect to RSK section
• customLbcAddress: if you provide this parameter then the SDK will use the contract at that address as the LBC when connected to the Regtest network.
• customRegtestUrl: this parameter is deprecated and will be removed in future versions. You can disregard it.
• captchaTokenResolver: some liquidity providers might want their quotes to be human-generated only for security reasons. For this cases the FlyoverSDK needs a function to get the captcha token returned from a successful captcha challenge from wherever the client application decided to store it. The SDK only expects the token to be returned to that function so the signature is () => Promise<string>
• disableChecksum: this parameter tells the FlyoverSDK whether to disable the RSK checksum validation for the RSK addresses involved in the PegIn and PegOut operations or not. It is false by default.

Connect to RSK

If you need to connect to RSK to execute some operation then you need to create an RSKConnection and provide it to Flyover object

    const rsk = await BlockchainConnection.createUsingStandard(window.ethereum)
    const flyover = new Flyover({ rskConnection: rsk, network: 'Regtest' })

or you can set it after creation

    const rsk = await BlockchainConnection.createUsingStandard(window.ethereum)
    await flyover.connectToRsk(rsk)

Also you can provide your own regtest LBC address if you want to connect to a local node for development purposes

    const rsk = await BlockchainConnection.createUsingStandard(window.ethereum)
    const flyover = new Flyover({ 
        rskConnection: rsk, 
        network: 'Regtest', 
        customLbcAddress: '0x1eD614cd3443EFd9c70F04b6d777aed947A4b0c4' 
    })

There are 3 ways to create an RSK connection, you can check them in RSKConnection class documentation

Flyover utils

FlyoverSDK exports an object with a collection of util functions that the client application might use during the integration with the SDK. You can see the list of the utility functions here and also when importing the FlyoverUtils object from the SDK package every function has a JsDoc explaining its usage.

Supported addresses

Currently, not all the types of Bitcoin addresses are supported in Flyover Protocol. The address support is summarized in the following table: | Address type | Testnet prefix | Mainnet prefix | Supported | Testnet example | Mainnet example | |:------------:|:--------------:|:--------------:|:------------------:|:--------------------------------------------------------------:|:--------------------------------------------------------------:| | P2PKH | m or n | 1 | :white_check_mark: | mvL2bVzGUeC9oqVyQWJ4PxQspFzKgjzAqe | 12higDjoCCNXSA95xZMWUdPvXNmkAduhWv | | P2SH | 2 | 3 | :white_check_mark: | 2MzQwSSnBHWHqSAqtTVQ6v47XtaisrJa1Vc | 342ftSRCvFHfCeFFBuz4xwbeqnDw6BGUey | | P2WPKH | tb1 | bc1 | :x: | tb1qvprq2gqzhj5nqmp8tm598yrs2g32vm0ut2lcge | bc1q34aq5drpuwy3wgl9lhup9892qp6svr8ldzyy7c | | P2WSH | tb1 | bc1 | :x: | tb1qrp33g0q5c5txsp9arysrx4k6zdkfs4nce4xj0gdcccefvpysxf3q0sl5k7 | bc1qeklep85ntjz4605drds6aww9u0qr46qzrv5xswd35uhjuj8ahfcqgf6hak | | P2TR | tb1p | bc1p | :x: | tb1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqp3mvzv | bc1p5d7rjq7g6rdk2yhzks9smlaqtedr4dekq08ge8ztwac72sfr9rusxg3297 |

Model Syncrhonization

To synchronize the data structures of the project with the ones of the Liquidity Provider Server you need to run npm run api-sync <branch name>. This will update the src/api/bindings folder updating each structure to match LPS. All fields types will coincide with server structures, but its important to clarify that fields whose name contains the word fee, nonce, amount, cost or value will be build as bigint in TS interface instead of number. To synchronize the ABI of the LBC you need to run npm run api-sync <branch name>.

Application Programming Interface

To see the full API of this package please refer to the the docs folder of this project