TypeScript

Proof Service

You could git clone and run TypeScript open demo for help.

The core example of codes:

package.json

{
  "dependencies": {
    "ethereumjs-util": "^7.1.4"
  }
}

index.ts

import { ecsign, toRpcSig, keccakFromString, BN } from 'ethereumjs-util';

async function personalSign(message: Buffer, privateKey: Buffer): Promise<Buffer> {
    const messageHash = keccakFromString(`\x19Ethereum Signed Message:\n${message.length}${message}`, 256)
    const signature = ecsign(messageHash, privateKey)
    return Buffer.from(toRpcSig(signature.v, signature.r, signature.s).slice(2), 'hex')
}

async function main() {
    // this message come from the return attribute "sign_payload" of everytime calling API: v1/proof/payload
    const message = Buffer.from('{\"action\":\"create\",\"created_at\":\"1656843378\",\"identity\":\"your_twitter_handle\",\"platform\":\"twitter\",\"prev\":\"KNyNFtvhlRVJh/oU6RryK2n+C2dja9aLQPjlv5VHMsQErZROojEmMAgmeEQVC094EOuHIYcv3lCYXf8d3zqDCQE=\",\"uuid\":\"353449e6-3a6f-4ac8-ae65-ba14bf466baf\"}', 'utf8');
    // ATTENTION! We intently replaced the last three digit of private key to be xxx.
    // Private key is everything and NEVER expose it to others or publicly
    const secretKey = Buffer.from('43c25fecc20e6b2a0d86c81a0202d125c0181deb9975d1170d80378c7e05bxxx', 'hex');
    const signature = await personalSign(message, secretKey);

    console.log(`Signature: 0x${signature.toString('hex')}`);
    // For demo ONLY
    // Signature: 0xf72fe6b00be411bd70ffe1b9bf322f18529ea10e9559dd26ba10387544849fc86d712709dfb709efc3dcc0a01b6f6b9ca98bd48fe780d58921f4926c6f2c0b871b

    console.log(`Signature(base64): ${signature.toString('base64')}`);
    // For demo ONLY
    // Signature(base64): 9y/msAvkEb1w/+G5vzIvGFKeoQ6VWd0muhA4dUSEn8htcScJ37cJ78PcwKAbb2ucqYvUj+eA1Ykh9JJsbywLhxs=
}

main();

Relation Service

You could git clone and run TypeScript relation service codegen demo for help.

For typescript projects, we encourage to use GraphQL Code Generator to generate code from your very own GraphQL queries and remote schema.

To install and configure GraphQL Code Generator, you can add following dependencies or check its official installation guide:

package.json

{
  "scripts": {
    "codegen": "graphql-codegen --config codegen.yml"
  },  
  "dependencies": {
    "graphql": "^16.5.0"
  },
  "devDependencies": {
    "@graphql-codegen/cli": "2.11.6",
    "@graphql-codegen/introspection": "2.2.1",
    "@graphql-codegen/typescript": "^2.7.3",
    "@graphql-codegen/typescript-graphql-request": "^4.5.3",
    "@graphql-codegen/typescript-operations": "^2.5.3",
    "@graphql-codegen/typescript-resolvers": "2.7.3",
  }
}

Configure codegen.yml manually as following:

codegen.yml

overwrite: true
schema: 'https://relation-service.next.id/'
documents: 'graphql/**/*.graphql'
generates:
  graphql.ts:
    plugins:
      - 'typescript'
      - 'typescript-operations'
      - 'typescript-graphql-request'

Note that the schema URL for staging server is https://relation-service.nextnext.id/, and for production server is https://relation-service.next.id/.

You can place pre-configured GraphQL queries in the graphql/ folder as the documents field specified in codegen.yml.

graphql/getTwitterUserNeighbors.graphql

query getTwitterUserNeighbors($id: String!, $depth: Int!) {
  identity(platform: "twitter", identity: $id) {
    addedAt
    neighborWithTraversal(depth: $depth) {
      fetcher
      source
      createdAt
      uuid
      from {
        uuid
        identity
        platform
        displayName
      }
      to {
        uuid
        platform
        identity
        displayName
      }
    }
  }
}

From now on, run npm run codegen to generate code from all your GraphQL queries, and then introduce the generated code to your project.

index.ts

import { GraphQLClient } from 'graphql-request'
import { getSdk } from './graphql'

async function main() {
    const client = new GraphQLClient('https://relation-service.next.id/');
    const sdk = getSdk(client);
    const result = await sdk.getTwitterUserNeighbors({
        id: 'your_twitter_handle',
        depth: 2
    });
    console.log('Twitter user relation query result', result);
}