Support Request objects.

Fixes #141

src/__test__/solid-auth-client.spec.js

@@ -606,7 +606,7 @@ describe('fetch', () => {
     expect(resp.status).toBe(200)
   })
 
-  it('merges a Header object with the authorization header', async () => {
+  it('merges a Headers object with the authorization header', async () => {
     await saveSession(window.localStorage)(fakeSession)
 
     nock('https://third-party.com')
@@ -628,6 +628,28 @@ describe('fetch', () => {
     expect(resp.status).toBe(200)
   })
 
+  // skipped because isomorphic-fetch does not support Request as first parameter;
+  // it works in the browser
+  it.skip('merges headers in a Request object with the authorization header', async () => {
+    await saveSession(window.localStorage)(fakeSession)
+
+    nock('https://third-party.com')
+      .get('/private-resource')
+      .reply(401, '', { 'www-authenticate': 'Bearer scope="openid webid"' })
+      .get('/private-resource')
+      .matchHeader('accept', 'text/plain')
+      .matchHeader('authorization', matchAuthzHeader('https://third-party.com'))
+      .reply(200)
+
+    const resp = await instance.fetch({
+      url: 'https://third-party.com/private-resource',
+      headers: {
+        entries: () => [['accept', 'text/plain']]
+      }
+    })
+    expect(resp.status).toBe(200)
+  })
+
   it('does not resend with credentials if the www-authenticate header is missing', async () => {
     expect.assertions(1)
     await saveSession(window.localStorage)(fakeSession)

src/webid-oidc.js

@@ -1,5 +1,5 @@
 // @flow
-/* global RequestInfo, Response */
+/* global Response */
 import * as authorization from 'auth-header'
 import RelyingParty from '@solid/oidc-rp'
 import PoPToken from '@solid/oidc-rp/lib/PoPToken'
@@ -216,16 +216,17 @@ export function requiresAuth(resp: Response): boolean {
 export async function fetchWithCredentials(
   session: webIdOidcSession,
   fetch: Function,
-  input: RequestInfo,
+  input: any,
   options?: RequestOptions
 ): Promise<Response> {
   // Create a copy of the headers
   const headers = {}
-  if (options && options.headers) {
+  const origHeaders = options ? options.headers : input.headers
+  if (origHeaders) {
     const entries =
-      typeof options.headers.entries === 'function'
-        ? options.headers.entries()
-        : Object.entries(options.headers)
+      typeof origHeaders.entries === 'function'
+        ? origHeaders.entries()
+        : Object.entries(origHeaders)
     for (const [name, value] of entries) {
       headers[name] = value
     }