feat: add additional headers and update linter

Author: JGiola

eslint.config.mjs

@@ -15,7 +15,7 @@
 
 // @ts-check
 import eslint from '@eslint/js'
-import stylisticJs from '@stylistic/eslint-plugin-js'
+import stylistic from '@stylistic/eslint-plugin'
 import tseslint from 'typescript-eslint'
 
 export default tseslint.config(
@@ -32,7 +32,7 @@ export default tseslint.config(
     ],
   },
   eslint.configs.recommended,
-  stylisticJs.configs.all,
+  stylistic.configs.all,
   tseslint.configs.recommended,
   tseslint.configs.stylistic,
   {
@@ -47,62 +47,76 @@ export default tseslint.config(
           allowSeparatedGroups: true,
         },
       ],
-      '@stylistic/js/multiline-comment-style': 'off',
-      '@stylistic/js/lines-between-class-members': 'off',
-      '@stylistic/js/newline-per-chained-call': 'off',
-      '@stylistic/js/indent': [
+      '@stylistic/multiline-comment-style': 'off',
+      '@stylistic/lines-between-class-members': 'off',
+      '@stylistic/newline-per-chained-call': 'off',
+      '@stylistic/indent': [
         'error',
         2,
       ],
-      '@stylistic/js/quotes': [
+      '@stylistic/quotes': [
         'error',
         'single',
         {
           allowTemplateLiterals: true,
         },
       ],
-      '@stylistic/js/quote-props': [
+      '@stylistic/quote-props': [
         'error',
         'as-needed',
       ],
-      '@stylistic/js/semi': [
+      '@stylistic/semi': [
         'error',
         'never',
       ],
-      '@stylistic/js/comma-dangle': [
+      '@stylistic/comma-dangle': [
         'error',
         'always-multiline',
       ],
-      '@stylistic/js/function-call-argument-newline': [
+      '@stylistic/function-call-argument-newline': [
         'error',
         'consistent',
       ],
-      '@stylistic/js/padded-blocks': [
+      '@stylistic/padded-blocks': [
         'error',
         'never',
       ],
-      '@stylistic/js/object-curly-spacing': [
+      '@stylistic/object-curly-spacing': [
         'error',
         'always',
       ],
-      '@stylistic/js/array-bracket-spacing': [
+      '@stylistic/array-bracket-spacing': [
         'error',
         'always',
       ],
-      '@stylistic/js/array-bracket-newline': [
+      '@stylistic/array-bracket-newline': [
         'error',
         'consistent',
       ],
-      '@stylistic/js/array-element-newline': [
+      '@stylistic/array-element-newline': [
         'error',
         'consistent',
       ],
-      '@stylistic/js/object-property-newline': [
+      '@stylistic/object-property-newline': [
         'error',
         {
           allowAllPropertiesOnSameLine: true,
         },
       ],
+      '@stylistic/member-delimiter-style': [
+        'error',
+        {
+          multiline: {
+            delimiter: 'none',
+            requireLast: true
+          },
+          singleline: {
+            delimiter: 'comma',
+            requireLast: false
+          },
+          multilineDetection: 'brackets'
+        },
+      ]
     },
   },
 )

package-lock.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",
-    "@stylistic/eslint-plugin-js": "^4.4.0",
+    "@stylistic/eslint-plugin": "^4.4.0",
     "@types/node": "^22.15.27",
     "c8": "^10.1.3",
     "eslint": "^9.27.0",

package.json

@@ -26,9 +26,9 @@ export enum ScopeType {
 }
 
 export interface FeatureTogglesContext {
-  tenantId?: string,
-  projectId?: string,
-  envId?: string,
+  tenantId?: string
+  projectId?: string
+  envId?: string
 }
 
 export type IFeatureTogglesClient = Omit<FeatureTogglesClient, 'client'>

src/clients/FeaturesToggleClient.ts

@@ -91,7 +91,7 @@ export class APIClient {
     const url = new URL(path, this.baseURL)
     params.set('per_page', '200')
 
-    const results:T[] = []
+    const results: T[] = []
     let page = startingPage
     do {
       params.set('page', `${page}`)

src/lib/client/index.ts

@@ -35,8 +35,8 @@ interface MiactlCache {
   expiry: string // ISO-8601 format
 }
 
-async function getMiactlCache (endpoint: string): Promise<MiactlCache|undefined> {
-  let cacheFolderPath: string|undefined = process.env['XDG_CACHE_HOME']
+async function getMiactlCache (endpoint: string): Promise<MiactlCache | undefined> {
+  let cacheFolderPath: string | undefined = process.env['XDG_CACHE_HOME']
   if (!cacheFolderPath) {
     const home = homeFolderPath()
     cacheFolderPath = join(home, '.cache')

src/lib/client/miactl-cache.ts

@@ -39,17 +39,17 @@ export class AccessToken {
     return this.expires_at - (Date.now() + expirationWindowSeconds * 1000) <= 0
   }
 
-  refreshToken (): string|undefined {
+  refreshToken (): string | undefined {
     return this.refresh_token
   }
 }
 
 interface AuthnOpts {
-  clientId?: string,
-  clientSecret?: string,
+  clientId?: string
+  clientSecret?: string
 }
 
-export async function doAuthentication (baseURL: string, options: AuthnOpts): Promise<AccessToken|undefined> {
+export async function doAuthentication (baseURL: string, options: AuthnOpts): Promise<AccessToken | undefined> {
   if (options.clientId && options.clientSecret) {
     return await doM2MAuthentication(baseURL, options.clientId, options.clientSecret)
   }
@@ -95,7 +95,7 @@ async function doM2MAuthentication (baseURL: string, clientId: string, clientCre
   return new AccessToken(data.access_token, data.token_type, data.expires_in)
 }
 
-async function doUserAuthentication (baseURL: string): Promise<AccessToken|undefined> {
+async function doUserAuthentication (baseURL: string): Promise<AccessToken | undefined> {
   const miactlToken = await loadMiactlToken(baseURL)
   if (!miactlToken) {
     return undefined

src/lib/client/token.ts

@@ -23,7 +23,7 @@ import { httpServer } from './httpserver.js'
 suite('test http streaming server', () => {
   const testHost = 'http://localhost:3000'
 
-  let fastify:FastifyInstance
+  let fastify: FastifyInstance
   beforeEach(async () => {
     fastify = Fastify({
       logger: false,

src/server/httpserver.test.ts

@@ -13,11 +13,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+import { env } from 'node:process'
+
 import { FastifyInstance } from 'fastify'
 import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'
 import { ErrorCode, JSONRPC_VERSION } from '@modelcontextprotocol/sdk/types.js'
 
 import { getMcpServer } from './server'
+import { IncomingHttpHeaders } from 'undici/types/header'
 
 export interface HTTPServerOptions {
   host: string
@@ -27,10 +30,18 @@ export interface HTTPServerOptions {
 
 export function httpServer (fastify: FastifyInstance, opts: HTTPServerOptions) {
   const { host, clientID, clientSecret } = opts
+  const additionalHeadersKeys = env.HEADERS_TO_PROXY?.split(',') || []
 
   fastify.post('/mcp', async (request, reply) => {
+    const additionalHeaders: IncomingHttpHeaders = {}
+    for (const key of additionalHeadersKeys) {
+      if (key in request.headers) {
+        additionalHeaders[key] = request.headers[key]
+      }
+    }
+
     try {
-      const server = getMcpServer(host, clientID, clientSecret)
+      const server = getMcpServer(host, clientID, clientSecret, additionalHeaders)
       const transport = new StreamableHTTPServerTransport({
         sessionIdGenerator: undefined,
       })

src/server/httpserver.ts

@@ -45,7 +45,7 @@ export async function TestMCPServer (toolsBuilder: ToolsBuilder): Promise<Client
   return testClient
 }
 
-export function getAppContext (ctx: Partial<AppContext> & {client: APIClient}): AppContext {
+export function getAppContext (ctx: Partial<AppContext> & { client: APIClient }): AppContext {
   return {
     ftClient: getMockFeatureTogglesClient({}),
     ...ctx,