Feat: add the ability to add in additional route properties

docs/api/options.md

@@ -89,6 +89,7 @@
 - `allowBatchedQueries`: Boolean. Flag to control whether to allow batched queries. When `true`, the server supports recieving an array of queries and returns an array of results.
 
 - `compilerOptions`: Object. Configurable options for the graphql-jit compiler. For more details check https://github.com/zalando-incubator/graphql-jit
+- `additionalRouteProps`: Object. Takes similar configuration to the Route Options of Fastify. Usecases include being able to add constraints, modify validation schema, increase the `bodyLimit`, etc. You can read more about the possible values on [fastify.dev's Routes Options](https://fastify.dev/docs/latest/Reference/Routes/#options)
 
 #### queryDepth example
 

index.d.ts

@@ -3,6 +3,7 @@ import {
   FastifyReply,
   FastifyRequest,
   FastifyInstance,
+  RouteOptions
 } from "fastify";
 import {
   DocumentNode,
@@ -487,6 +488,18 @@ declare namespace mercurius {
      * receive an array of responses within a single request.
      */
     allowBatchedQueries?: boolean;
+
+    /**
+     * Customize the graphql routers initialized by mercurius with 
+     * more fastify route options. 
+     * 
+     * Usecases:
+     * - Add more validation 
+     * - change the schema structure 
+     * - Hook on the request's life cycle
+     * - Increase body size limit for larger queries
+    */
+    additionalRouteProps?:Omit<RouteOptions,"handler" | "wsHandler">
   }
 
   export type MercuriusOptions = MercuriusCommonOptions & (MercuriusSchemaOptions)

index.js

@@ -210,7 +210,8 @@ const mercurius = fp(async function (app, opts) {
       entityResolversFactory: undefined,
       subscriptionContextFn,
       keepAlive,
-      fullWsTransport
+      fullWsTransport,
+      additionalRouteProps: opts.additionalRouteProps
     })
   }
 

lib/routes.js

@@ -200,7 +200,8 @@ module.exports = async function (app, opts) {
     persistedQueryProvider,
     allowBatchedQueries,
     keepAlive,
-    fullWsTransport
+    fullWsTransport,
+    additionalRouteProps
   } = opts
 
   // Load the persisted query settings
@@ -214,6 +215,12 @@ module.exports = async function (app, opts) {
     notSupportedError
   } = persistedQueryProvider || {}
 
+  const normalizedRouteProps = { ...additionalRouteProps }
+  if (normalizedRouteProps.handler || normalizedRouteProps.wsHandler) {
+    normalizedRouteProps.handler = undefined
+    normalizedRouteProps.wsHandler = undefined
+  }
+
   async function executeQuery (query, variables, operationName, request, reply) {
     // Validate a query is present
     if (!query) {
@@ -293,6 +300,7 @@ module.exports = async function (app, opts) {
     method: 'GET',
     schema: getSchema,
     attachValidation: true,
+    ...normalizedRouteProps,
     handler: async function (request, reply) {
       // Generate the context for this request
       if (contextFn) {
@@ -338,7 +346,8 @@ module.exports = async function (app, opts) {
 
   app.post(graphqlPath, {
     schema: postSchema(allowBatchedQueries),
-    attachValidation: true
+    attachValidation: true,
+    ...normalizedRouteProps
   }, async function (request, reply) {
     // Generate the context for this request
     if (contextFn) {

test/routes.js

@@ -2187,3 +2187,100 @@ test('if ide has plugin set, serve config.js with the correct endpoint', async (
   t.equal(res.body.toString(), 'window.GRAPHQL_ENDPOINT = \'/something/app/graphql\';\n' +
     'window.GRAPHIQL_PLUGIN_LIST = []')
 })
+
+test('GET graphql endpoint with invalid additionalRouteProp constraint', async (t) => {
+  const app = Fastify()
+  const schema = `
+    type Query {
+      add(x: Int, y: Int): Int
+    }
+  `
+  app.register(GQL, {
+    schema,
+    additionalRouteProps: {
+      constraints: {
+        host: 'auth.fastify.dev'
+      }
+    }
+  })
+
+  const res = await app.inject({
+    method: 'GET',
+    url: '/graphiql',
+    headers: {
+      Host: 'fail.fastify.dev'
+    }
+  })
+
+  t.equal(res.statusCode, 404)
+})
+
+test('GET graphql endpoint with valid additionalRouteProp constraint', async (t) => {
+  const app = Fastify()
+  const schema = `
+    type Query {
+      add(x: Int, y: Int): Int
+    }
+  `
+  app.register(GQL, {
+    schema,
+    additionalRouteProps: {
+      constraints: {
+        host: 'auth.fastify.dev'
+      }
+    }
+  })
+
+  const query = '{ add(x: 2, y: 2) }'
+
+  const res = await app.inject({
+    method: 'GET',
+    url: '/graphql',
+    headers: {
+      Host: 'auth.fastify.dev',
+      'Content-Type': 'text/plain'
+    },
+    query: {
+      query
+    }
+  })
+
+  t.equal(res.statusCode, 200)
+})
+
+test('GET graphql endpoint, additionalRouteProps should ignore custom handler', async (t) => {
+  const app = Fastify()
+  const schema = `
+    type Query {
+      add(x: Int, y: Int): Int
+    }
+  `
+
+  let executed = false
+
+  app.register(GQL, {
+    schema,
+    additionalRouteProps: {
+      // @ts-expect-error `handler` property is ignored in props
+      handler (req, reply) {
+        executed = true
+      }
+    }
+  })
+
+  const query = '{ add(x: 2, y: 2) }'
+
+  const res = await app.inject({
+    method: 'GET',
+    url: '/graphql',
+    headers: {
+      'Content-Type': 'text/plain'
+    },
+    query: {
+      query
+    }
+  })
+
+  t.equal(res.statusCode, 200)
+  t.notOk(executed)
+})