Adds LibreCapital nav EA (#3924)

* Adds EA for LibreCapital

* Adds date validation

* Refactors to use SubscribeTransport for multi HTTP requests

* Adds unit tests, addreses feedback

* Increases cache max age

* Adds unit tests for transport nav and improvements

* Addresses comments

---------

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

Author: mohamed-mehany

.changeset/shiny-points-melt.md

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+---
+'@chainlink/nav-libre-adapter': major
+---
+
+Adds NAV adapter for LibreCapital

.pnp.cjs

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+# Chainlink External Adapter for nav-libre
+
+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 nav-libre`.

.yarn/cache/uuid-npm-11.1.0-61d0d08928-d2da43b49b.zip

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+{
+  "name": "@chainlink/nav-libre-adapter",
+  "version": "0.0.0",
+  "description": "Chainlink nav-libre adapter.",
+  "keywords": [
+    "Chainlink",
+    "LINK",
+    "blockchain",
+    "oracle",
+    "nav-libre"
+  ],
+  "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/crypto-js": "^4",
+    "@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",
+    "crypto-js": "^4.2.0",
+    "date-fns": "^4.1.0",
+    "tslib": "2.4.1",
+    "uuid": "^11.1.0"
+  }
+}

packages/sources/nav-libre/CHANGELOG.md

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+import { AdapterConfig } from '@chainlink/external-adapter-framework/config'
+
+export const config = new AdapterConfig(
+  {
+    API_KEY: {
+      description: 'An API key for Data Provider',
+      type: 'string',
+      required: true,
+      sensitive: true,
+    },
+    SECRET_KEY: {
+      description: 'A key for Data Provider used in hashing the API key',
+      type: 'string',
+      required: true,
+      sensitive: true,
+    },
+    API_ENDPOINT: {
+      description: 'An API endpoint for Data Provider',
+      type: 'string',
+      default: 'https://api.navfundservices.com',
+    },
+    BACKGROUND_EXECUTE_MS: {
+      description:
+        'The amount of time the background execute should sleep before performing the next request',
+      type: 'number',
+      default: 120_000, // one call per two minute
+    },
+  },
+  {
+    envDefaultOverrides: {
+      CACHE_MAX_AGE: 900_000, // 15 minute cache
+      RETRY: 0, // Disables retry on Framework
+    },
+  },
+)

packages/sources/nav-libre/README.md

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

packages/sources/nav-libre/package.json

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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 { navLibreTransport } from '../transport/nav'
+
+export const inputParameters = new InputParameters(
+  {
+    globalFundID: {
+      required: true,
+      type: 'number',
+      description: 'The global fund ID for the Libre fund',
+    },
+  },
+  [
+    {
+      globalFundID: 1234,
+    },
+  ],
+)
+export type BaseEndpointTypes = {
+  Parameters: typeof inputParameters.definition
+  Response: {
+    Result: number
+    Data: {
+      navPerShare: number
+      navDate: string
+      globalFundID: number
+    }
+  }
+  Settings: typeof config.settings
+}
+
+export const endpoint = new AdapterEndpoint({
+  name: 'nav',
+  transport: navLibreTransport,
+  inputParameters,
+})

packages/sources/nav-libre/src/config/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: 'NAV_LIBRE',
+  config,
+  endpoints: [nav],
+})
+
+export const server = (): Promise<ServerInstance | undefined> => expose(adapter)