feat(core): introduce GraphQL importer

closes #232

packages/core/package.json

@@ -45,6 +45,9 @@
     "coverage": "cross-env NODE_ENV=test jest --coverage"
   },
   "dependencies": {
+    "@graphql-tools/graphql-file-loader": "^8.0.1",
+    "@graphql-tools/load": "^8.0.2",
+    "graphql": "^16.8.1",
     "js-yaml": "^4.1.0",
     "openapi-types": "^10.0.0",
     "tslib": "^2.3.1"

packages/core/src/importers/GraphQLImporter.ts

@@ -0,0 +1,104 @@
+import { BaseImporter } from './BaseImporter';
+import { ImporterType } from './ImporterType';
+import { isArrayOfStrings } from '../utils';
+import { type DocFormat, type Spec } from './Spec';
+import { GraphQL, introspectionFromSchema } from '../types';
+import { loadSchema } from '@graphql-tools/load';
+import { URL } from 'url';
+import { type BinaryLike, createHash } from 'crypto';
+
+export class GraphQLImporter extends BaseImporter<ImporterType.GRAPHQL> {
+  get type(): ImporterType.GRAPHQL {
+    return ImporterType.GRAPHQL;
+  }
+
+  constructor() {
+    super();
+  }
+
+  public async import(
+    content: string,
+    expectedFormat?: DocFormat
+  ): Promise<Spec<ImporterType.GRAPHQL, GraphQL.Document> | undefined> {
+    try {
+      const spec = await super.import(content, expectedFormat);
+
+      return spec
+        ? {
+            ...spec,
+            doc: await this.tryConvertSDL(spec.doc)
+          }
+        : spec;
+    } catch {
+      // noop
+    }
+
+    return Promise.resolve(undefined);
+  }
+
+  public isSupported(spec: unknown): spec is GraphQL.Document {
+    return (
+      this.isGraphQLSDLEnvelope(spec) ||
+      this.isGraphQlIntrospectionEnvelope(spec)
+    );
+  }
+
+  protected fileName({
+    doc
+  }: {
+    doc: GraphQL.Document;
+    format: DocFormat;
+  }): string | undefined {
+    const url = new URL(doc.url);
+    const checkSum = this.generateCheckSum(url.toString());
+
+    return `${url.hostname}-${checkSum}`.toLowerCase();
+  }
+
+  private async tryConvertSDL(
+    obj: GraphQL.Document
+  ): Promise<GraphQL.Document> {
+    if (this.isGraphQLSDLEnvelope(obj)) {
+      const schema = await loadSchema(obj.data, {
+        loaders: []
+      });
+
+      return {
+        ...obj,
+        data: introspectionFromSchema(schema)
+      };
+    }
+
+    return obj;
+  }
+
+  private isGraphQLSDLEnvelope(
+    obj: unknown
+  ): obj is GraphQL.GraphQLEnvelope<string | string[]> {
+    return (
+      typeof obj === 'object' &&
+      'url' in obj &&
+      typeof (obj as GraphQL.GraphQLEnvelope<string>).url === 'string' &&
+      'data' in obj &&
+      (typeof (obj as GraphQL.GraphQLEnvelope<string>).data === 'string' ||
+        isArrayOfStrings((obj as GraphQL.GraphQLEnvelope<string[]>).data))
+    );
+  }
+
+  private isGraphQlIntrospectionEnvelope(
+    obj: unknown
+  ): obj is GraphQL.Document {
+    return (
+      typeof obj === 'object' &&
+      'url' in obj &&
+      typeof (obj as GraphQL.Document).url === 'string' &&
+      'data' in obj &&
+      '__schema' in (obj as GraphQL.Document).data &&
+      typeof (obj as GraphQL.Document).data.__schema === 'object'
+    );
+  }
+
+  private generateCheckSum(value: BinaryLike): string {
+    return createHash('md5').update(value).digest('hex');
+  }
+}

packages/core/src/importers/ImporterType.ts

@@ -2,5 +2,6 @@ export enum ImporterType {
   HAR = 'har',
   OASV3 = 'oasv3',
   OASV2 = 'oasv2',
-  POSTMAN = 'postman'
+  POSTMAN = 'postman',
+  GRAPHQL = 'graphql'
 }

packages/core/src/importers/Spec.ts

@@ -1,5 +1,5 @@
 import { ImporterType } from './ImporterType';
-import { Har, OpenAPIV2, OpenAPIV3, Postman } from '../types';
+import { Har, OpenAPIV2, OpenAPIV3, Postman, GraphQL } from '../types';
 
 export type DocType = `${ImporterType}` | string;
 
@@ -9,6 +9,8 @@ export type Doc<T extends DocType> = T extends ImporterType.OASV2
   ? OpenAPIV3.Document
   : T extends ImporterType.POSTMAN
   ? Postman.Document
+  : T extends ImporterType.GRAPHQL
+  ? GraphQL.Document
   : T extends ImporterType.HAR
   ? Har
   : unknown;

packages/core/src/importers/SpecImporter.ts

@@ -5,14 +5,16 @@ import { OASV3Importer } from './OASV3Importer';
 import { PostmanImporter } from './PostmanImporter';
 import { OASV2Importer } from './OASV2Importer';
 import { HARImporter } from './HARImporter';
+import { GraphQLImporter } from './GraphQLImporter';
 
 export class SpecImporter implements Importer<DocType> {
   constructor(
     private readonly importers: ReadonlyArray<Importer<DocType>> = [
       new HARImporter(),
       new OASV3Importer(),
       new PostmanImporter(),
-      new OASV2Importer()
+      new OASV2Importer(),
+      new GraphQLImporter()
     ]
   ) {}
 

packages/core/src/importers/index.ts

@@ -1,3 +1,4 @@
+export * from './GraphQLImporter';
 export * from './HARImporter';
 export * from './Importer';
 export * from './ImporterErrorProvider';

packages/core/src/types/graphql.ts

@@ -0,0 +1,15 @@
+import { IntrospectionQuery } from 'graphql';
+
+// eslint-disable-next-line @typescript-eslint/no-namespace
+export namespace GraphQL {
+  export interface GraphQLEnvelope<
+    T extends IntrospectionQuery | string | string[]
+  > {
+    url: string;
+    data: T;
+  }
+
+  export type Document = GraphQLEnvelope<IntrospectionQuery>;
+}
+
+export * from 'graphql';

packages/core/src/types/index.ts

@@ -1,3 +1,4 @@
 export * from './har';
-export * from './openapi';
 export * from './postman';
+export * from './openapi';
+export * from './graphql';

packages/core/src/utils/index.ts

@@ -1,2 +1,3 @@
 export * from './first';
 export * from './url';
+export * from './is-array-of-strings'

packages/core/src/utils/is-array-of-strings.ts

@@ -0,0 +1,3 @@
+export const isArrayOfStrings = (data: unknown) => !!data && Array.isArray(data)
+    ? data.every(item => typeof item === 'string')
+    : false;

packages/core/tests/GraphQLImporter.spec.ts

@@ -0,0 +1,95 @@
+import { GraphQLImporter } from '../src/importers/GraphQLImporter';
+import { readFile } from 'fs';
+import { resolve } from 'path';
+import { promisify } from 'util';
+
+describe('GraphQLImporter', () => {
+  const readFileAsync = promisify(readFile);
+
+  let sut!: GraphQLImporter;
+
+  beforeEach(() => {
+    sut = new GraphQLImporter();
+  });
+
+  describe('type', () => {
+    it(`should return graphql`, () => {
+      // act
+      const result = sut.type;
+
+      // assert
+      expect(result).toStrictEqual('graphql');
+    });
+  });
+
+  describe('import', () => {
+    it('should not import unparsable content ', async () => {
+      // arrange
+      const content = '{';
+
+      // act
+      const spec = await sut.import(content);
+
+      // assert
+      expect(spec).toBeUndefined();
+    });
+
+    it('should import introspection envelope', async () => {
+      // arrange
+      const input =
+        await promisify(readFile)(
+          resolve(__dirname, './fixtures/graphql.json'),
+          'utf8'
+        );
+
+      const expected = JSON.parse(
+          await promisify(readFile)(
+              resolve(__dirname, './fixtures/graphql.result.json'),
+              'utf8'
+          )
+      );
+
+      // act
+      const spec = await sut.import(input);
+
+      // assert
+      expect(spec).toMatchObject({
+        doc: expected,
+        format: 'json',
+        type: 'graphql',
+        name: 'example.com-c00f7d6a02b8e2fb143fd737b7302c15'
+      });
+    });
+
+    it('should import SDL envelope', async () => {
+      // arrange
+      const input = JSON.stringify({
+        url: 'https://example.com/graphql',
+        data: [
+          await readFileAsync(
+            resolve(__dirname, './fixtures/graphql.graphql'),
+            'utf-8'
+          )
+        ]
+      });
+
+      const expected = JSON.parse(
+        await promisify(readFile)(
+          resolve(__dirname, './fixtures/graphql.result.json'),
+          'utf8'
+        )
+      );
+
+      // act
+      const spec = await sut.import(input);
+
+      // assert
+      expect(spec).toMatchObject({
+        doc: expected,
+        format: 'json',
+        type: 'graphql',
+        name: 'example.com-c00f7d6a02b8e2fb143fd737b7302c15'
+      });
+    });
+  });
+});

packages/core/tests/fixtures/graphql.graphql

@@ -0,0 +1,43 @@
+interface Identifiable {
+  id: ID!
+}
+
+type Foo implements Identifiable {
+  id: ID!
+  fooField: String!
+}
+
+type Bar implements Identifiable {
+  id: ID!
+  barField: Int!
+}
+
+type Baz {
+  id: ID!
+  bazField: Float!
+}
+
+type Qux {
+  id: ID!
+  quxField: Boolean!
+}
+
+input QuxInput {
+  quxField: Boolean!
+}
+
+union FooQux = Foo | Qux
+
+type Query {
+  getFoo(id: ID!): Foo
+  getBar(id: ID!): Bar
+  getBaz(id: ID!): Baz
+  getFooOrQux(id: ID!): FooQux
+}
+
+type Mutation {
+  createFoo(fooField: String!): Foo
+  updateBar(id: ID!, barField: Int!): Bar
+  deleteBaz(id: ID!): Baz
+  createQux(qux: QuxInput!): Qux
+}