feat(open-payments): adding open-payments package

packages/open-payments/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "open-payments",
+  "description": "",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist/**/*"
+  ],
+  "scripts": {
+    "build": "pnpm clean && tsc --build tsconfig.json",
+    "clean": "rm -fr dist/",
+    "prepack": "pnpm build",
+    "generate:types": "npx ts-node scripts/generate-types.ts"
+  },
+  "devDependencies": {
+    "@types/node": "^18.7.12",
+    "openapi-typescript": "^4.5.0",
+    "ts-node": "^10.7.0",
+    "typescript": "^4.3.0"
+  },
+  "dependencies": {
+    "axios": "^1.1.2"
+  }
+}

packages/open-payments/scripts/generate-types.ts

@@ -0,0 +1,19 @@
+import fs from 'fs'
+import openapiTS from 'openapi-typescript'
+import config from '../src/config'
+;(async () => {
+  try {
+    const output = await openapiTS(config.OPEN_PAYMENTS_OPEN_API_URL)
+    const fileName = 'src/generated/types.ts'
+
+    fs.writeFile(fileName, output, (error) => {
+      if (error) {
+        console.log(`Error when writing types to ${fileName}`, { error })
+      }
+    })
+  } catch (error) {
+    console.log('Error when generating types', {
+      error
+    })
+  }
+})()

packages/open-payments/src/client.ts

@@ -0,0 +1,57 @@
+import { ILPStreamConnection, IncomingPayment } from './types'
+import axios, { AxiosInstance } from 'axios'
+import config from './config'
+
+interface CreateOpenPaymentClientArgs {
+  timeout?: number
+}
+
+interface GetArgs {
+  url: string
+  accessToken: string
+}
+
+export interface OpenPaymentsClient {
+  incomingPayment: {
+    get(args: GetArgs): Promise<IncomingPayment>
+  }
+  ilpStreamConnection: {
+    get(args: GetArgs): Promise<ILPStreamConnection>
+  }
+}
+
+const get = async <T>(axios: AxiosInstance, args: GetArgs): Promise<T> => {
+  const { url, accessToken } = args
+
+  const { data } = await axios.get(url, {
+    headers: accessToken
+      ? {
+          Authorization: `GNAP ${accessToken}`,
+          Signature: 'TODO',
+          'Signature-Input': 'TODO'
+        }
+      : {}
+  })
+
+  return data
+}
+
+export const createClient = (
+  args?: CreateOpenPaymentClientArgs
+): OpenPaymentsClient => {
+  const defaultTimeout = config.DEFAULT_REQUEST_TIMEOUT || 3_000
+  const axiosInstance = axios.create({
+    timeout: args.timeout ?? defaultTimeout
+  })
+
+  axiosInstance.defaults.headers.common['Content-Type'] = 'application/json'
+
+  return {
+    incomingPayment: {
+      get: (args: GetArgs) => get<IncomingPayment>(axios, args)
+    },
+    ilpStreamConnection: {
+      get: (args: GetArgs) => get<ILPStreamConnection>(axios, args)
+    }
+  }
+}

packages/open-payments/src/config.ts

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+export default {
+  OPEN_PAYMENTS_OPEN_API_URL:
+    'https://raw.githubusercontent.com/interledger/open-payments/main/open-api-spec.yaml',
+  DEFAULT_REQUEST_TIMEOUT: 3_000
+}