Backed-Fi EA (#3929)

* Backed-Fi EA

* Testing; Adding error message in response

* Change: network as query param

* Rework: code review fixes

---------

Co-authored-by: mmcallister-cll <139181225+mmcallister-cll@users.noreply.github.com>

Author: Subarna-Singh

.changeset/purple-cobras-double.md

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+---
+'@chainlink/backed-fi-adapter': major
+---
+
+Version 1.0.0 of Backed-Fi EA

.pnp.cjs

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+# BACKED_FI
+
+![0.0.0](https://img.shields.io/github/package-json/v/smartcontractkit/external-adapters-js?filename=packages/sources/backed-fi/package.json) ![v3](https://img.shields.io/badge/framework%20version-v3-blueviolet)
+
+This document was generated automatically. Please see [README Generator](../../scripts#readme-generator) for more info.
+
+## Environment Variables
+
+| Required? |     Name     |          Description          |  Type  | Options |               Default                |
+| :-------: | :----------: | :---------------------------: | :----: | :-----: | :----------------------------------: |
+|           | API_ENDPOINT | An API endpoint for Backed-Fi | string |         | `https://api.backed.fi/api/v1/token` |
+
+---
+
+## Data Provider Rate Limits
+
+There are no rate limits for this adapter.
+
+---
+
+## Input Parameters
+
+| Required? |   Name   |     Description     |  Type  |              Options               |   Default    |
+| :-------: | :------: | :-----------------: | :----: | :--------------------------------: | :----------: |
+|           | endpoint | The endpoint to use | string | [multiplier](#multiplier-endpoint) | `multiplier` |
+
+## Multiplier Endpoint
+
+`multiplier` is the only supported name for this endpoint.
+
+### Input Params
+
+| Required? |    Name     | Aliases |            Description             |  Type  | Options | Default | Depends On | Not Valid With |
+| :-------: | :---------: | :-----: | :--------------------------------: | :----: | :-----: | :-----: | :--------: | :------------: |
+|    ✅     | tokenSymbol |         |    The symbol of token to query    | string |         |         |            |                |
+|    ✅     |   network   |         | The symbol of the network to query | string |         |         |            |                |
+
+### Example
+
+Request:
+
+```json
+{
+  "data": {
+    "endpoint": "multiplier",
+    "tokenSymbol": "AMZNx",
+    "network": "Solana"
+  }
+}
+```
+
+---
+
+MIT License

packages/sources/backed-fi/CHANGELOG.md

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+{
+  "name": "@chainlink/backed-fi-adapter",
+  "version": "0.0.0",
+  "description": "Chainlink backed-fi adapter.",
+  "keywords": [
+    "Chainlink",
+    "LINK",
+    "blockchain",
+    "oracle",
+    "backed-fi"
+  ],
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "repository": {
+    "url": "https://github.com/smartcontractkit/external-adapters-js",
+    "type": "git"
+  },
+  "license": "MIT",
+  "scripts": {
+    "clean": "rm -rf dist && rm -f tsconfig.tsbuildinfo",
+    "prepack": "yarn build",
+    "build": "tsc -b",
+    "server": "node -e 'require(\"./index.js\").server()'",
+    "server:dist": "node -e 'require(\"./dist/index.js\").server()'",
+    "start": "yarn server:dist"
+  },
+  "devDependencies": {
+    "@types/jest": "29.5.14",
+    "@types/node": "22.14.1",
+    "nock": "13.5.6",
+    "typescript": "5.8.3"
+  },
+  "dependencies": {
+    "@chainlink/external-adapter-framework": "2.6.0",
+    "tslib": "2.4.1"
+  }
+}

packages/sources/backed-fi/README.md

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+import { AdapterConfig } from '@chainlink/external-adapter-framework/config'
+
+export const config = new AdapterConfig({
+  API_ENDPOINT: {
+    description: 'An API endpoint for Backed-Fi',
+    type: 'string',
+    default: 'https://api.backed.fi/api/v1/token',
+  },
+})

packages/sources/backed-fi/package.json

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+export { endpoint as multiplier } from './multiplier'

packages/sources/backed-fi/src/config/index.ts

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+import { AdapterEndpoint } from '@chainlink/external-adapter-framework/adapter'
+import { InputParameters } from '@chainlink/external-adapter-framework/validation'
+import { config } from '../config'
+import { httpTransport } from '../transport/multiplier'
+
+export const inputParameters = new InputParameters(
+  {
+    tokenSymbol: {
+      required: true,
+      type: 'string',
+      description: 'The symbol of token to query',
+    },
+    network: {
+      required: true,
+      type: 'string',
+      description: 'The symbol of the network to query',
+    },
+  },
+  [
+    {
+      tokenSymbol: 'AMZNx',
+      network: 'Solana',
+    },
+  ],
+)
+
+export type GMCIResultResponse = {
+  Result: number
+  Data: {
+    currentMultiplier: number
+    newMultiplier: number
+    activationDateTime: number
+    reason: string | null
+  }
+}
+
+export type BaseEndpointTypes = {
+  Parameters: typeof inputParameters.definition
+  Response: GMCIResultResponse
+  Settings: typeof config.settings
+}
+
+export const endpoint = new AdapterEndpoint({
+  name: 'multiplier',
+  aliases: [],
+  transport: httpTransport,
+  inputParameters,
+})

packages/sources/backed-fi/src/endpoint/index.ts

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+import { expose, ServerInstance } from '@chainlink/external-adapter-framework'
+import { Adapter } from '@chainlink/external-adapter-framework/adapter'
+import { config } from './config'
+import { multiplier } from './endpoint'
+
+export const adapter = new Adapter({
+  defaultEndpoint: multiplier.name,
+  name: 'BACKED_FI',
+  config,
+  endpoints: [multiplier],
+  rateLimiting: {
+    tiers: {
+      default: {
+        rateLimit1m: 6,
+        note: 'Setting reasonable default limits',
+      },
+    },
+  },
+})
+
+export const server = (): Promise<ServerInstance | undefined> => expose(adapter)

packages/sources/backed-fi/src/endpoint/multiplier.ts

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+import { HttpTransport } from '@chainlink/external-adapter-framework/transports'
+import { BaseEndpointTypes } from '../endpoint/multiplier'
+
+export interface ResponseSchema {
+  activationDateTime: number
+  currentMultiplier: number
+  newMultiplier: number
+  reason: string | null
+  error: string
+  message: string
+}
+
+export type HttpTransportTypes = BaseEndpointTypes & {
+  Provider: {
+    RequestBody: never
+    ResponseBody: ResponseSchema
+  }
+}
+export const httpTransport = new HttpTransport<HttpTransportTypes>({
+  prepareRequests: (params, config) => {
+    return params.map((param) => {
+      return {
+        params: [param],
+        request: {
+          baseURL: config.API_ENDPOINT,
+          url: `${param.tokenSymbol}/multiplier`,
+          params: {
+            network: param.network,
+          },
+        },
+      }
+    })
+  },
+  parseResponse: (params, response) => {
+    if (!response.data) {
+      return params.map((param) => {
+        return {
+          params: param,
+          response: {
+            errorMessage: `The data provider didn't return any value for ${param.tokenSymbol} on network ${param.network}`,
+            statusCode: 502,
+          },
+        }
+      })
+    }
+
+    if (response.data.error) {
+      return params.map((param) => {
+        return {
+          params: param,
+          response: {
+            errorMessage: response.data.message,
+            statusCode: 502,
+          },
+        }
+      })
+    }
+
+    return params.map((param) => {
+      const result = response.data.currentMultiplier
+      return {
+        params: param,
+        response: {
+          result: result,
+          data: response.data,
+        },
+      }
+    })
+  },
+})