Allow domain to contain http scheme (#1144)

* Allow root url scheme to be passed as an option

* Fix typo in test name

* Refactor to check whether http(s) is passed and append if not

* Use indexof instead of startswith

src/authentication/index.js

@@ -78,7 +78,7 @@ function Authentication(auth0, options) {
         optional: true,
         type: 'object',
         message: '_telemetryInfo option is not valid'
-      }
+      },
     }
   );
   /* eslint-enable */
@@ -88,9 +88,11 @@ function Authentication(auth0, options) {
     this.baseOptions._sendTelemetry === false
       ? this.baseOptions._sendTelemetry
       : true;
-
-  this.baseOptions.rootUrl = 'https://' + this.baseOptions.domain;
-
+
+  this.baseOptions.rootUrl = (this.baseOptions.domain && this.baseOptions.domain.toLowerCase().indexOf('http') === 0)
+      ? this.baseOptions.domain
+      : 'https://' + this.baseOptions.domain;
+
   this.request = new RequestBuilder(this.baseOptions);
 
   this.passwordless = new PasswordlessAuthentication(

test/authentication/authentication.test.js

@@ -32,6 +32,19 @@ describe('auth0.authentication', function() {
       var auth0 = new Authentication({}, { domain: 'foo', clientID: 'cid' });
       expect(auth0.baseOptions.domain).to.be.equal('foo');
     });
+
+    [
+      {domain: 'https://foo', expectedRootUrl: 'https://foo'},
+      {domain: 'http://foo', expectedRootUrl: 'http://foo'},
+      {domain: 'HTTPS://FOO', expectedRootUrl: 'HTTPS://FOO'},
+      {domain: 'foo', expectedRootUrl: 'https://foo'},
+    ].forEach(function(mockData) {
+      it(`should construct root url ${mockData.expectedRootUrl} when using domain ${mockData.domain}`, function() {
+        var auth0 = new Authentication({ domain: mockData.domain, clientID: 'cid'  });
+        expect(auth0.baseOptions.rootUrl).to.be.equal(mockData.expectedRootUrl);
+      });
+    });
+
     it('should check that options is passed', function() {
       expect(function() {
         var auth0 = new Authentication();