Adds WisdomTree NAV EA (#3914)

* Adds wisdomtree EA

* Adds changeset

* Modify rate limit threshold

* Adds HTTP header for auth

* Typo

* Adding trailing slash to avoid the 301 redirect

* Adds wisdomtree ea to tsconfig

* Fixes mocking

* adding providerIndicatedTimeUnixMs

---------

Co-authored-by: Matthew McAllister <matthew.mcallister@smartcontract.com>

Author: mohamed-mehany

.changeset/curvy-olives-destroy.md

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+---
+'@chainlink/wisdomtree-adapter': major
+---
+
+Adds Wisdomtree adapter

.pnp.cjs

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+# Chainlink External Adapter for wisdomtree
+
+This README will be generated automatically when code is merged to `main`. If you would like to generate a preview of the README, please run `yarn generate:readme wisdomtree`.

packages/sources/wisdomtree/CHANGELOG.md

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+{
+  "name": "@chainlink/wisdomtree-adapter",
+  "version": "0.0.0",
+  "description": "Chainlink wisdomtree adapter.",
+  "keywords": [
+    "Chainlink",
+    "LINK",
+    "blockchain",
+    "oracle",
+    "wisdomtree"
+  ],
+  "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/wisdomtree/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 Data Provider',
+    type: 'string',
+    default: 'https://dataspanapi.wisdomtree.com',
+  },
+  API_KEY: {
+    description: 'WisdomTree API key value',
+    type: 'string',
+    required: true,
+    sensitive: true,
+  },
+})

packages/sources/wisdomtree/package.json

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

packages/sources/wisdomtree/src/config/index.ts

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+import { AdapterEndpoint } from '@chainlink/external-adapter-framework/adapter'
+import { SingleNumberResultResponse } from '@chainlink/external-adapter-framework/util'
+import { InputParameters } from '@chainlink/external-adapter-framework/validation'
+import { config } from '../config'
+import { httpTransport } from '../transport/nav'
+
+export const inputParameters = new InputParameters(
+  {
+    ticker: {
+      aliases: ['symbol', 'fundId'],
+      required: true,
+      type: 'string',
+      description: 'The symbol of the fund ticker to query',
+    },
+  },
+  [
+    {
+      ticker: 'WTGXX',
+    },
+  ],
+)
+export type BaseEndpointTypes = {
+  Parameters: typeof inputParameters.definition
+  Response: SingleNumberResultResponse
+  Settings: typeof config.settings
+}
+
+export const endpoint = new AdapterEndpoint({
+  name: 'nav',
+  transport: httpTransport,
+  inputParameters,
+})

packages/sources/wisdomtree/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 { nav } from './endpoint'
+
+export const adapter = new Adapter({
+  defaultEndpoint: nav.name,
+  name: 'WISDOMTREE',
+  config,
+  endpoints: [nav],
+  rateLimiting: {
+    tiers: {
+      default: {
+        rateLimit1m: 2,
+        note: 'Reasonable limits',
+      },
+    },
+  },
+})
+
+export const server = (): Promise<ServerInstance | undefined> => expose(adapter)

packages/sources/wisdomtree/src/endpoint/nav.ts

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+import { HttpTransport } from '@chainlink/external-adapter-framework/transports'
+import { BaseEndpointTypes } from '../endpoint/nav'
+
+export interface ResponseSchema {
+  ticker: string
+  relatedTicker: string
+  name: string
+  dt: string
+  nav: number
+  sharesOutstanding: number
+  aum: number
+  navPrevious: number
+  navDelta: number
+  navDeltaPCT: number
+}
+
+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: '/funddetails/nav/',
+          headers: {
+            'x-wt-dataspan-key': config.API_KEY,
+          },
+          params: {
+            ticker: param.ticker.toUpperCase(),
+          },
+        },
+      }
+    })
+  },
+  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.ticker}`,
+            statusCode: 502,
+          },
+        }
+      })
+    }
+
+    const timestamps = {
+      providerIndicatedTimeUnixMs: new Date(response.data.dt).getTime(),
+    }
+
+    return params.map((param) => {
+      const result = response.data.nav
+      return {
+        params: param,
+        response: {
+          result,
+          data: {
+            result,
+          },
+          timestamps,
+        },
+      }
+    })
+  },
+})