GraphQL Apollo Server

A set of MakerX plugins for Apollo Server

GraphQL operation logging plugin

graphqlOperationLoggingPlugin logs GraphQL operations using the logger from the GraphQL context.

Logging is performed via the willSendResponse and willSendSubsequentPayload hooks, which will run for all query, mutation and subscription operations (including those with errors).

Logging of context creation failure can be enabled by supplying a logger to the contextCreationFailureLogger option.

Options

• logLevel: the log level to use (default: info)
• ignoreIntrospectionQueries: if true, introspection queries will not be logged (default: true)
• contextCreationFailureLogger: The plugin does not have access to a logger prior to context creation, so if you wish to log context creation failures, supply a logger here (it will only be called for context creation failure).
• contextCreationDidFail: If you wish to custom log or otherwise react to context creation failures, supply a handler for the plugin contextCreationDidFail hook (this will be called instead of logging to contextCreationFailureLogger).
• shouldIgnore: an optional callback that can be used to ignore certain operations, e.g. if you have a healthcheck operation that you prefer not to be logged.
• includeResponseData: if true, the operation's result.data will be included in the log output (default: false)
• includeMutationResponseData: if true, the operation's result.data will be included in the log output for mutations only (default: false)
• adjustVariables: an optional callback that can be used to adjust the operation's variables before logging
• adjustResultData: an optional callback that can be used to adjust the operation's result.data before logging

const plugins: ApolloServerPlugin<GraphQLContext>[] = [
  graphqlOperationLoggingPlugin<GraphQLContext, Logger>({
    logLevel: 'audit',
    contextCreationFailureLogger: logger,
    includeMutationResponseData: true,
    adjustVariables: (variables) => pruneKeys(variables, 'headers'),
  }),
]

Output includes:

• type: the GraphQL operation type: query, mutation or subscription
• operationName: the optional operation name
• query: the formatted operation
• duration: milliseconds taken to process the operation from context creation to willSendResponse hook
• variables: the optional operation variables, optionally adjusted by the adjustVariables callback
• result.errors: the operation's GraphQLFormattedError[], if any
• result.data: the operation's data result, if includeResponseData is true or includeMutationResponseData is true and the operation is a mutation, optionally adjusted by the adjustResultData callback
• isIncrementalResponse: true if the operation is part of an incremental delivery response (@defer or @stream)
• isSubsequentPayload: true if the operation is a subsequent payload of an incremental delivery response

Introspection Control Plugin

introspectionControlPlugin implements a standard pattern of rejecting unauthorized introspection requests in production.

• Unauthorized requests are those that do not have a user set on the GraphQL context.
• Production is determined according to NODE_ENV === 'production' via node-common

Apollo Server test helpers

Apollo Server v4 introduced an executeOperation function to enable operations to be run directly against the server instance, without requiring an HTTP server or network calls.

Bypassing the HTTP stack supports complete control over JWT payloads and other operation context inputs required to set up complex test scenarios.

The @makerx/graphql-apollo-server/testing module supports testing your GraphQL implementation using this method:

• buildExecuteOperation accepts an ApolloServer instance and context creation function and returns an executeOperation function which:
  • is strongly typed to the GraphQL context
  • accepts TypedDocumentNode operations to provide strong operation typing
• createTestContext accepts a JwtPayload and returns a basic GraphQLContext which can be used in tests:
  • requestInfo is set to a testRequestInfo constant
  • logger is set to a no-op logger
  • User is constructed using the specified JwtPayload
• buildJwt creates a JwtPayload suitable for tests, using overridable random defaults

GraphQL testing example

The following example demonstrates how to use the buildExecuteOperation to run strongly typed tests against an ApolloServer instance.

The example uses a basic createTestContext function, it can be replaced with your own context creation function, which may be different for tests vs normal runtime.

The complete source code for this sample is available in the src/testing/tests directory.

Refer to the GraphQL-Codegen documentation for info on generating strongly typed operations.

test-context.ts

This file provides a Vitest test context which sets up an ApolloServer instance and provides the executeOperation function to tests.

import { buildExecuteOperation, createTestContext } from '@makerx/graphql-apollo-server/testing'
import type { GraphQLContext } from '@makerx/graphql-core'
import { test as testBase } from 'vitest'
import { createTestServer } from './server'

interface TestContext {
  executeOperation: ReturnType<typeof buildExecuteOperation<GraphQLContext, typeof createTestContext>>
}

export const test = testBase.extend<TestContext>({
  // eslint-disable-next-line no-empty-pattern
  executeOperation: async ({}, use) => {
    // setup
    const server = createTestServer<GraphQLContext>()
    const executeOperation = buildExecuteOperation(server, createTestContext)
    // test
    await use(executeOperation)
    // teardown
    server.stop()
  },
})

hello-query.test.ts

import { buildJwt } from '@makerx/graphql-apollo-server/testing'
import { describe, expect } from 'vitest'
import { graphql } from './gql'
import { test } from './test-context'

const helloQuery = graphql(`
  query Hello($message: String) {
    hello(message: $message)
  }
`)

describe('hello query operation', () => {
  test('anonymous calls fail', async ({ executeOperation }) => {
    const result = await executeOperation({ query: helloQuery, variables: { message: 'world' } })
    expect(result.errors?.[0]?.message).toBe('Not authenticated')
  })

  test('authenticated calls work', async ({ executeOperation }) => {
    const result = await executeOperation({ query: helloQuery, variables: { message: 'world' } }, buildJwt())
    expect(result.data?.hello).toBe('Hello, world!')
  })

  test('user name is returned', async ({ executeOperation }) => {
    const result = await executeOperation({ query: helloQuery }, buildJwt({ name: 'Magda' }))
    expect(result.data?.hello).toBe('Hello, Magda!')
  })

  test('user email is returned', async ({ executeOperation }) => {
    const result = await executeOperation({ query: helloQuery }, buildJwt({ email: 'magda@magda.net' }))
    expect(result.data?.hello).toBe('Hello, magda@magda.net!')
  })
})

important-mutation.test.ts

import { buildJwt } from '@makerx/graphql-apollo-server/testing'
import { describe, expect } from 'vitest'
import { graphql } from './gql'
import { test } from './test-context'

const importantMutation = graphql(`
  mutation Important {
    important
  }
`)

describe('important mutation operation', () => {
  test('anonymous calls fail', async ({ executeOperation }) => {
    const result = await executeOperation({ query: importantMutation })
    expect(result.errors?.[0]?.message).toBe('Not authorized')
  })

  test('non-admin calls fail', async ({ executeOperation }) => {
    const result = await executeOperation({ query: importantMutation }, buildJwt({ roles: ['User'] }))
    expect(result.errors?.[0]?.message).toBe('Not authorized')
  })

  test('admin calls work', async ({ executeOperation }) => {
    const result = await executeOperation({ query: importantMutation }, buildJwt({ roles: ['Admin'] }))
    expect(result.data?.important).toBe('Operation successful')
  })
})

me-query.test.ts

This test shows how the context input JWT payload can be easily controlled when operating underneath the HTTP layer where Bearer token validation and decoding would normally be required.

import { buildJwt } from '@makerx/graphql-apollo-server/testing'
import { describe, expect } from 'vitest'
import { graphql } from './gql'
import { test } from './test-context'

const meQuery = graphql(`
  query Me {
    me {
      id
      name
      email
      roles
    }
  }
`)

const jwtPayloads = {
  basicUser: buildJwt(),
  userWithRoles: buildJwt({ roles: ['Admin', 'Supervisor'] }),
  userWithName: buildJwt({ name: 'Magda' }),
}

describe('me query operation', () => {
  test('anonymous calls return null', async ({ executeOperation }) => {
    const result = await executeOperation({ query: meQuery })
    expect(result.data?.me).toBeNull()
  })

  test('returns basic user', async ({ executeOperation }) => {
    const result = await executeOperation({ query: meQuery }, jwtPayloads.basicUser)
    expect(result.data?.me).toMatchObject({
      id: jwtPayloads.basicUser.oid,
      email: jwtPayloads.basicUser.email,
    })
  })

  test('returns user roles', async ({ executeOperation }) => {
    const result = await executeOperation({ query: meQuery }, jwtPayloads.userWithRoles)
    expect(result.data?.me).toMatchObject({
      id: jwtPayloads.userWithRoles.oid,
      email: jwtPayloads.userWithRoles.email,
      roles: jwtPayloads.userWithRoles.roles,
    })
  })

  test('returns user name', async ({ executeOperation }) => {
    const result = await executeOperation({ query: meQuery }, jwtPayloads.userWithName)
    expect(result.data?.me).toMatchObject({
      id: jwtPayloads.userWithName.oid,
      email: jwtPayloads.userWithName.email,
      name: jwtPayloads.userWithName.name,
    })
  })
})