feat: Specifiy constants in separate file

src/ldp/http/SimpleBodyParser.ts

@@ -1,4 +1,5 @@
 import { BodyParser } from './BodyParser';
+import { DATA_TYPE_QUAD } from '../../util/ContentTypes';
 import { HttpRequest } from '../../server/HttpRequest';
 import { PassThrough } from 'stream';
 import { QuadRepresentation } from '../representation/QuadRepresentation';
@@ -53,7 +54,7 @@ export class SimpleBodyParser extends BodyParser {
     data.on('error', (error): boolean => errorStream.emit('error', new UnsupportedHttpError(error.message)));
 
     return {
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       data: errorStream,
       metadata,
     };

src/ldp/http/SimpleResponseWriter.ts

@@ -1,3 +1,4 @@
+import { DATA_TYPE_BINARY } from '../../util/ContentTypes';
 import { HttpError } from '../../util/errors/HttpError';
 import { HttpResponse } from '../../server/HttpResponse';
 import { ResponseDescription } from '../operations/ResponseDescription';
@@ -11,8 +12,8 @@ export class SimpleResponseWriter extends ResponseWriter {
   public async canHandle(input: { response: HttpResponse; result: ResponseDescription | Error }): Promise<void> {
     if (!(input.result instanceof Error)) {
       const dataType = input.result.body?.dataType;
-      if (dataType && dataType !== 'binary' && dataType !== 'string') {
-        throw new UnsupportedHttpError('Only string or binary results are supported.');
+      if (dataType && dataType !== DATA_TYPE_BINARY) {
+        throw new UnsupportedHttpError('Only binary results are supported.');
       }
     }
   }

src/storage/SimpleResourceStore.ts

@@ -11,6 +11,7 @@ import { ResourceStore } from './ResourceStore';
 import streamifyArray from 'streamify-array';
 import { StreamWriter } from 'n3';
 import { UnsupportedMediaTypeHttpError } from '../util/errors/UnsupportedMediaTypeHttpError';
+import { CONTENT_TYPE_QUADS, DATA_TYPE_BINARY, DATA_TYPE_QUAD } from '../util/ContentTypes';
 
 /**
  * Resource store storing its data as Quads in an in-memory map.
@@ -113,7 +114,7 @@ export class SimpleResourceStore implements ResourceStore {
    * @returns Promise of array of Quads pulled from the stream.
    */
   private async parseRepresentation(representation: Representation): Promise<Quad[]> {
-    if (representation.dataType !== 'quad') {
+    if (representation.dataType !== DATA_TYPE_QUAD) {
       throw new UnsupportedMediaTypeHttpError('SimpleResourceStore only supports quad representations.');
     }
     return arrayifyStream(representation.data);
@@ -134,7 +135,7 @@ export class SimpleResourceStore implements ResourceStore {
    */
   private generateRepresentation(data: Quad[], preferences: RepresentationPreferences): Representation {
     // Always return turtle unless explicitly asked for quads
-    if (preferences.type?.some((preference): boolean => preference.value.includes('internal/quads'))) {
+    if (preferences.type?.some((preference): boolean => preference.value.includes(CONTENT_TYPE_QUADS))) {
       return this.generateQuadRepresentation(data);
     }
     return this.generateBinaryRepresentation(data);
@@ -148,7 +149,7 @@ export class SimpleResourceStore implements ResourceStore {
    */
   private generateBinaryRepresentation(data: Quad[]): BinaryRepresentation {
     return {
-      dataType: 'binary',
+      dataType: DATA_TYPE_BINARY,
       data: streamifyArray([ ...data ]).pipe(new StreamWriter({ format: 'text/turtle' })),
       metadata: { raw: [], profiles: [], contentType: 'text/turtle' },
     };
@@ -162,7 +163,7 @@ export class SimpleResourceStore implements ResourceStore {
    */
   private generateQuadRepresentation(data: Quad[]): QuadRepresentation {
     return {
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       data: streamifyArray([ ...data ]),
       metadata: { raw: [], profiles: []},
     };

src/storage/patch/SimpleSparqlUpdatePatchHandler.ts

@@ -11,6 +11,7 @@ import { someTerms } from 'rdf-terms';
 import { SparqlUpdatePatch } from '../../ldp/http/SparqlUpdatePatch';
 import { Store } from 'n3';
 import { UnsupportedHttpError } from '../../util/errors/UnsupportedHttpError';
+import { CONTENT_TYPE_QUADS, DATA_TYPE_QUAD } from '../../util/ContentTypes';
 
 /**
  * PatchHandler that supports specific types of SPARQL updates.
@@ -55,7 +56,7 @@ export class SimpleSparqlUpdatePatchHandler extends PatchHandler {
 
     const lock = await this.locker.acquire(input.identifier);
     const quads = await this.source.getRepresentation(input.identifier,
-      { type: [{ value: 'internal/quads', weight: 1 }]});
+      { type: [{ value: CONTENT_TYPE_QUADS, weight: 1 }]});
     const store = new Store<BaseQuad>();
     const importEmitter = store.import(quads.data);
     await new Promise((resolve, reject): void => {
@@ -66,11 +67,11 @@ export class SimpleSparqlUpdatePatchHandler extends PatchHandler {
     store.addQuads(inserts);
     const representation: Representation = {
       data: store.match() as Readable,
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       metadata: {
         raw: [],
         profiles: [],
-        contentType: 'internal/quads',
+        contentType: CONTENT_TYPE_QUADS,
       },
     };
     await this.source.setRepresentation(input.identifier, representation);

src/util/ContentTypes.ts

@@ -0,0 +1,4 @@
+export const DATA_TYPE_BINARY = 'binary';
+export const DATA_TYPE_QUAD = 'quad';
+
+export const CONTENT_TYPE_QUADS = 'internal/quads';

test/integration/RequestParser.test.ts

@@ -1,5 +1,6 @@
 import { AcceptPreferenceParser } from '../../src/ldp/http/AcceptPreferenceParser';
 import arrayifyStream from 'arrayify-stream';
+import { DATA_TYPE_QUAD } from '../../src/util/ContentTypes';
 import { HttpRequest } from '../../src/server/HttpRequest';
 import { Readable } from 'stream';
 import { SimpleBodyParser } from '../../src/ldp/http/SimpleBodyParser';
@@ -35,7 +36,7 @@ describe('A SimpleRequestParser with simple input parsers', (): void => {
       },
       body: {
         data: expect.any(Readable),
-        dataType: 'quad',
+        dataType: DATA_TYPE_QUAD,
         metadata: {
           contentType: 'text/turtle',
           profiles: [],

test/unit/ldp/http/SimpleBodyParser.test.ts

@@ -1,4 +1,5 @@
 import arrayifyStream from 'arrayify-stream';
+import { DATA_TYPE_QUAD } from '../../../../src/util/ContentTypes';
 import { HttpRequest } from '../../../../src/server/HttpRequest';
 import { Readable } from 'stream';
 import { SimpleBodyParser } from '../../../../src/ldp/http/SimpleBodyParser';
@@ -44,7 +45,7 @@ describe('A SimpleBodyparser', (): void => {
     const result = (await bodyParser.handle(input))!;
     expect(result).toEqual({
       data: expect.any(Readable),
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       metadata: {
         contentType: 'text/turtle',
         profiles: [],

test/unit/ldp/http/SimpleResponseWriter.test.ts

@@ -5,6 +5,7 @@ import { SimpleResponseWriter } from '../../../../src/ldp/http/SimpleResponseWri
 import streamifyArray from 'streamify-array';
 import { UnsupportedHttpError } from '../../../../src/util/errors/UnsupportedHttpError';
 import { createResponse, MockResponse } from 'node-mocks-http';
+import { DATA_TYPE_BINARY, DATA_TYPE_QUAD } from '../../../../src/util/ContentTypes';
 
 describe('A SimpleResponseWriter', (): void => {
   const writer = new SimpleResponseWriter();
@@ -15,11 +16,9 @@ describe('A SimpleResponseWriter', (): void => {
   });
 
   it('requires the description body to be a string or binary stream if present.', async(): Promise<void> => {
-    await expect(writer.canHandle({ response, result: { body: { dataType: 'quad' }} as ResponseDescription }))
+    await expect(writer.canHandle({ response, result: { body: { dataType: DATA_TYPE_QUAD }} as ResponseDescription }))
       .rejects.toThrow(UnsupportedHttpError);
-    await expect(writer.canHandle({ response, result: { body: { dataType: 'string' }} as ResponseDescription }))
-      .resolves.toBeUndefined();
-    await expect(writer.canHandle({ response, result: { body: { dataType: 'binary' }} as ResponseDescription }))
+    await expect(writer.canHandle({ response, result: { body: { dataType: DATA_TYPE_BINARY }} as ResponseDescription }))
       .resolves.toBeUndefined();
   });
 
@@ -33,7 +32,7 @@ describe('A SimpleResponseWriter', (): void => {
   it('responds with a body if the description has a body.', async(done): Promise<void> => {
     const body = {
       data: streamifyArray([ '<http://test.com/s> <http://test.com/p> <http://test.com/o>.' ]),
-      dataType: 'binary',
+      dataType: DATA_TYPE_BINARY,
       metadata: {
         raw: [] as Quad[],
         profiles: [] as string[],
@@ -54,7 +53,7 @@ describe('A SimpleResponseWriter', (): void => {
   it('responds with a content-type if the metadata has it.', async(done): Promise<void> => {
     const body = {
       data: streamifyArray([ '<http://test.com/s> <http://test.com/p> <http://test.com/o>.' ]),
-      dataType: 'binary',
+      dataType: DATA_TYPE_BINARY,
       metadata: {
         raw: [] as Quad[],
         profiles: [] as string[],

test/unit/ldp/operations/SimpleGetOperationHandler.test.ts

@@ -1,3 +1,4 @@
+import { DATA_TYPE_QUAD } from '../../../../src/util/ContentTypes';
 import { Operation } from '../../../../src/ldp/operations/Operation';
 import { Representation } from '../../../../src/ldp/representation/Representation';
 import { ResourceStore } from '../../../../src/storage/ResourceStore';
@@ -6,7 +7,7 @@ import { UnsupportedHttpError } from '../../../../src/util/errors/UnsupportedHtt
 
 describe('A SimpleGetOperationHandler', (): void => {
   const store = {
-    getRepresentation: async(): Promise<Representation> => ({ dataType: 'quad' } as Representation),
+    getRepresentation: async(): Promise<Representation> => ({ dataType: DATA_TYPE_QUAD } as Representation),
   } as unknown as ResourceStore;
   const handler = new SimpleGetOperationHandler(store);
 
@@ -17,7 +18,7 @@ describe('A SimpleGetOperationHandler', (): void => {
 
   it('returns the representation from the store with the input identifier.', async(): Promise<void> => {
     await expect(handler.handle({ target: { path: 'url' }} as Operation)).resolves.toEqual(
-      { identifier: { path: 'url' }, body: { dataType: 'quad' }},
+      { identifier: { path: 'url' }, body: { dataType: DATA_TYPE_QUAD }},
     );
   });
 });

test/unit/storage/SimpleResourceStore.test.ts

@@ -6,6 +6,7 @@ import { RepresentationMetadata } from '../../../src/ldp/representation/Represen
 import { SimpleResourceStore } from '../../../src/storage/SimpleResourceStore';
 import streamifyArray from 'streamify-array';
 import { UnsupportedMediaTypeHttpError } from '../../../src/util/errors/UnsupportedMediaTypeHttpError';
+import { CONTENT_TYPE_QUADS, DATA_TYPE_BINARY, DATA_TYPE_QUAD } from '../../../src/util/ContentTypes';
 import { namedNode, triple } from '@rdfjs/data-model';
 
 const base = 'http://test.com/';
@@ -24,7 +25,7 @@ describe('A SimpleResourceStore', (): void => {
 
     representation = {
       data: streamifyArray([ quad ]),
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       metadata: {} as RepresentationMetadata,
     };
   });
@@ -43,16 +44,16 @@ describe('A SimpleResourceStore', (): void => {
   });
 
   it('errors for wrong input data types.', async(): Promise<void> => {
-    (representation as any).dataType = 'binary';
+    (representation as any).dataType = DATA_TYPE_BINARY;
     await expect(store.addResource({ path: base }, representation)).rejects.toThrow(UnsupportedMediaTypeHttpError);
   });
 
   it('can write and read data.', async(): Promise<void> => {
     const identifier = await store.addResource({ path: base }, representation);
     expect(identifier.path.startsWith(base)).toBeTruthy();
-    const result = await store.getRepresentation(identifier, { type: [{ value: 'internal/quads', weight: 1 }]});
+    const result = await store.getRepresentation(identifier, { type: [{ value: CONTENT_TYPE_QUADS, weight: 1 }]});
     expect(result).toEqual({
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       data: expect.any(Readable),
       metadata: {
         profiles: [],
@@ -74,7 +75,7 @@ describe('A SimpleResourceStore', (): void => {
     expect(identifier.path.startsWith(base)).toBeTruthy();
     const result = await store.getRepresentation(identifier, { type: [{ value: 'text/turtle', weight: 1 }]});
     expect(result).toEqual({
-      dataType: 'binary',
+      dataType: DATA_TYPE_BINARY,
       data: expect.any(Readable),
       metadata: {
         profiles: [],
@@ -92,7 +93,7 @@ describe('A SimpleResourceStore', (): void => {
     expect(identifier.path.startsWith(base)).toBeTruthy();
     const result = await store.getRepresentation(identifier, { });
     expect(result).toEqual({
-      dataType: 'binary',
+      dataType: DATA_TYPE_BINARY,
       data: expect.any(Readable),
       metadata: {
         profiles: [],
@@ -107,9 +108,9 @@ describe('A SimpleResourceStore', (): void => {
 
   it('can set data.', async(): Promise<void> => {
     await store.setRepresentation({ path: base }, representation);
-    const result = await store.getRepresentation({ path: base }, { type: [{ value: 'internal/quads', weight: 1 }]});
+    const result = await store.getRepresentation({ path: base }, { type: [{ value: CONTENT_TYPE_QUADS, weight: 1 }]});
     expect(result).toEqual({
-      dataType: 'quad',
+      dataType: DATA_TYPE_QUAD,
       data: expect.any(Readable),
       metadata: {
         profiles: [],

test/unit/storage/patch/SimpleSparqlUpdatePatchHandler.test.ts

@@ -8,6 +8,7 @@ import { SparqlUpdatePatch } from '../../../../src/ldp/http/SparqlUpdatePatch';
 import streamifyArray from 'streamify-array';
 import { translate } from 'sparqlalgebrajs';
 import { UnsupportedHttpError } from '../../../../src/util/errors/UnsupportedHttpError';
+import { CONTENT_TYPE_QUADS, DATA_TYPE_QUAD } from '../../../../src/util/ContentTypes';
 import { namedNode, quad } from '@rdfjs/data-model';
 
 describe('A SimpleSparqlUpdatePatchHandler', (): void => {
@@ -64,15 +65,15 @@ describe('A SimpleSparqlUpdatePatchHandler', (): void => {
   const basicChecks = async(quads: Quad[]): Promise<void> => {
     expect(source.getRepresentation).toHaveBeenCalledTimes(1);
     expect(source.getRepresentation).toHaveBeenLastCalledWith(
-      { path: 'path' }, { type: [{ value: 'internal/quads', weight: 1 }]},
+      { path: 'path' }, { type: [{ value: CONTENT_TYPE_QUADS, weight: 1 }]},
     );
     expect(source.setRepresentation).toHaveBeenCalledTimes(1);
     expect(order).toEqual([ 'acquire', 'getRepresentation', 'setRepresentation', 'release' ]);
     const setParams = (source.setRepresentation as jest.Mock).mock.calls[0];
     expect(setParams[0]).toEqual({ path: 'path' });
     expect(setParams[1]).toEqual(expect.objectContaining({
-      dataType: 'quad',
-      metadata: { raw: [], profiles: [], contentType: 'internal/quads' },
+      dataType: DATA_TYPE_QUAD,
+      metadata: { raw: [], profiles: [], contentType: CONTENT_TYPE_QUADS },
     }));
     await expect(arrayifyStream(setParams[1].data)).resolves.toBeRdfIsomorphic(quads);
   };