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Flow Wallet API Demo (Node.js + express)

⚠️ This demo is a work in progress.

This is a demonstration of a RESTful API that implements a simple custodial wallet service for the Flow blockchain.

Functionality

1. Admin

2. Transaction Execution

  • Send an arbitrary transaction from the admin account
  • Send an arbitrary transaction from a user account

3. Fungible Tokens

4. Non-Fungible Tokens

  • Set up admin account with non-fungible token collections (NFT.Collection)
  • Send non-fungible token withdrawals from admin account
  • Detect non-fungible token deposits to admin account
  • Set up a user account with non-fungible token collections (NFT.Collection)
  • Send non-fungible token withdrawals from a user account
  • Detect non-fungible token deposits to a user account
  • View the non-fungible tokens owned by the admin account
  • View the non-fungible tokens owned by a user account

Local Development

This local development environment uses the Flow Emulator to simulate the real Flow network.

Install the Flow CLI

First, install the Flow CLI.

Install dependencies and configure environment

npm install

cp .env.example .env

Start the database and emulator

Use Docker Compose to launch Postgres and the Flow Emulator:

npm run docker-local-network

Start the server

npm run dev

Deploy with Docker

To deploy this API as a Docker container in your infrastructure, either build from source or use the pre-built image:

docker pull gcr.io/flow-container-registry/flow-wallet-api-demo:latest

The Docker Compose sample configurations in this repository show how to configure this application when running as a Docker container.

Emulator

This example shows how to connect the Docker container to an instance of the Flow Emulator.

Configuration: docker-compose.emulator.yml

cp .env.emulator.example .env

docker-compose -f docker-compose.emulator.yml up

Once the emulator is running, you will need to deploy the FUSD contract:

npm run dev-deploy-contracts

Testnet

This example shows how to connect the Docker container to Flow Testnet.

First you'll need a Testnet account. Here's how to make one:

Generate a key pair

Generate a new key pair with the Flow CLI:

flow keys generate

⚠️ Make sure to save these keys in a safe place, you'll need them later.

Create your account

Go to the Flow Testnet Faucet to create a new account. Use the public key from the previous step.

Save your keys

After your account has been created, save the address and private key in the .env file:

cp .env.testnet.example .env
# Replace these values with your own!
FLOW_ADDRESS=0xabcdef12345689
FLOW_PRIVATE_KEY=aaaaaa...aaaaaa

Start the Docker containers

Configuration: docker-compose.testnet.yml

docker-compose -f docker-compose.testnet.yml up

API Routes

Accounts

List all accounts

GET /v1/accounts

Example

curl --request GET \
  --url http://localhost:3000/v1/accounts
[
  {
    "address": "0xf8d6e0586b0a20c7"
  },
  {
    "address": "0xe467b9dd11fa00df"
  }
]

Get an account

GET /v1/accounts/{address}

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")

Example

curl --request GET \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7
{
  "address": "0xf8d6e0586b0a20c7"
}

Create an account

POST /v1/accounts

Example

curl --request POST \
  --url http://localhost:3000/v1/accounts
{
  "address": "0xe467b9dd11fa00df"
}

Transaction Execution

Execute a transaction

⚠️ Not yet implemented

POST /v1/accounts/{address}/transactions

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")

Body (JSON)

  • code: The Cadence code to execute in the transaction
    • The code must always specify exactly one authorizer (i.e. prepare(auth: AuthAccount))

Example

curl --request POST \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7/transactions \
  --header 'Content-Type: application/json' \
  --data '{ "code": "transaction { prepare(auth: AuthAccount) { log(\"Hello, World!\") } }" }'
{
  "transactionId": "18647b584a03345f3b2d2c4d9ab2c4179ae1b124a7f62ef9f33910e5ca8b353c",
  "error": null,
}

Fungible Tokens

Supported tokens:

  • FLOW
  • FUSD

List all tokens

GET /v1/accounts/{address}/fungible-tokens

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")

Example

curl --request GET \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7/fungible-tokens
[
  {
    "name": "flow"
  },
  {
    "name": "fusd"
  }
]

Get details of a token type

GET /v1/accounts/{address}/fungible-tokens/{tokenName}

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the fungible token (e.g. "flow")

Example

curl --request GET \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7/fungible-tokens/flow
{
  "name": "flow", 
  "balance": "42.0"
}

List all withdrawals of a token type

⚠️ Not yet implemented

GET /v1/accounts/{address}/fungible-tokens/{tokenName}/withdrawals

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the fungible token (e.g. "flow")

Get details of a token withdrawal

⚠️ Not yet implemented

GET /v1/accounts/{address}/fungible-tokens/{tokenName}/withdrawals/{transactionId}

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the fungible token (e.g. "flow")
  • transactionId: The Flow transaction ID for the withdrawal

Create a token withdrawal

POST /v1/accounts/{address}/fungible-tokens/{tokenName}/withdrawals

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the fungible token (e.g. "flow")

Body (JSON)

  • amount: The number of tokens to transfer (e.g. "123.456")
    • Must be a fixed-point number with a maximum of 8 decimal places
  • recipient: The Flow address of the recipient (e.g. "0xf8d6e0586b0a20c7")

Example

curl --request POST \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7/fungible-tokens/fusd/withdrawls \
  --header 'Content-Type: application/json' \
  --data '{ "recipient": "0xe467b9dd11fa00df", "amount": "123.456" }'
{
  "transactionId": "18647b584a03345f3b2d2c4d9ab2c4179ae1b124a7f62ef9f33910e5ca8b353c",
  "recipient": "0xe467b9dd11fa00df",
  "amount": "123.456"
}

Non-Fungible Tokens

⚠️ Not yet implemented

List all tokens

⚠️ Not yet implemented

GET /v1/accounts/{address}/non-fungible-tokens

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")

Example

curl --request GET \
  --url http://localhost:3000/v1/accounts/0xf8d6e0586b0a20c7/non-fungible-tokens

Get details of a token

⚠️ Not yet implemented

GET /v1/accounts/{address}/non-fungible-tokens/{tokenName}

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the non-fungible token (e.g. "nba-top-shot-moment")

List all withdrawals of a token type

⚠️ Not yet implemented

GET /v1/accounts/{address}/non-fungible-tokens/{tokenName}/withdrawals

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the non-fungible token (e.g. "nba-top-shot-moment")

Get details of a token withdrawal

⚠️ Not yet implemented

GET /v1/accounts/{address}/non-fungible-tokens/{tokenName}/withdrawals/{transactionId}

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the non-fungible token (e.g. "nba-top-shot-moment")
  • transactionId: The Flow transaction ID for the withdrawal

Create a token withdrawal

⚠️ Not yet implemented

POST /v1/accounts/{address}/non-fungible-tokens/{tokenName}/withdrawals

Parameters

  • address: The address of the account (e.g. "0xf8d6e0586b0a20c7")
  • tokenName: The name of the non-fungible token (e.g. "nba-top-shot-moment")

Body (JSON)

  • recipient: The Flow address of the recipient (e.g. "0xf8d6e0586b0a20c7")

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