Store available authentication methods in ngrx/store

src/app/core/auth/auth.interceptor.ts

@@ -65,16 +65,53 @@ export class AuthInterceptor implements HttpInterceptor {
     return http.url && http.url.endsWith('/authn/logout');
   }
 
-  private parseAuthMethodsfromHeaders(headers: HttpHeaders): AuthMethodModel[] {
+  private parseShibbolethLocation(unparsedLocation: string): string {
-    console.log('parseAuthMethodsfromHeaders(): ', headers);
+    let parsedLocation = '';
-    // errorHeaders
+    unparsedLocation = unparsedLocation.trim();
-    return [];
+    unparsedLocation = unparsedLocation.replace('location="', '');
+    unparsedLocation = unparsedLocation.replace('"', '');
+    let re = /%3A%2F%2F/g;
+    unparsedLocation = unparsedLocation.replace(re, '://');
+    re = /%3A/g
+    unparsedLocation = unparsedLocation.replace(re, ':')
+    parsedLocation = unparsedLocation + '/shibboleth';
+
+    return parsedLocation;
   }
 
-  private makeAuthStatusObject(authenticated: boolean,  accessToken?: string, error?: string, location?: string, httpHeaders?: HttpHeaders, ): AuthStatus {
+  private parseAuthMethodsfromHeaders(headers: HttpHeaders): AuthMethodModel[] {
+    // console.log('parseAuthMethodsfromHeaders(): ', headers);
+    const authMethodModels: AuthMethodModel[] = [];
+    const parts: string[] = headers.get('www-authenticate').split(',');
+    console.log('parts: ', parts);
+    // get the login methods names
+    // tslint:disable-next-line:forin
+    for (const i in parts) {
+      const part: string = parts[i].trim();
+      if (part.includes('realm')) {
+        const methodName = part.split(' ')[0];
+        const authMethod: AuthMethodModel = new AuthMethodModel(methodName);
+        // check if the authentication method is  shibboleth
+        // if so the next part is the shibboleth location
+        // e.g part i: shibboleth realm="DSpace REST API", part i+1:  location="/Shibboleth.sso/Login?target=https%3A%2F%2Flocalhost%3A8080"
+        if (methodName.includes('shibboleth')) {
+          console.log('Index 2: ', parts[2]);
+          const location: string = this.parseShibbolethLocation(parts[+i + 1]); // +1:  unaray + operator is necessaray because i is a string, the operator works like parseInt()
+          // console.log('shib location: ', location);
+          authMethod.location = location;
+        }
+        authMethodModels.push(authMethod);
+      }
+    }
+    console.log('Array of AuthMethodModels: ', authMethodModels);
+    return authMethodModels;
+  }
+
+  private makeAuthStatusObject(authenticated: boolean, accessToken?: string, error?: string, location?: string, httpHeaders?: HttpHeaders,): AuthStatus {
     const authStatus = new AuthStatus();
 
     const authMethods: AuthMethodModel[] = this.parseAuthMethodsfromHeaders(httpHeaders);
+    authStatus.authMethods = authMethods;
     authStatus.id = null;
 
     authStatus.okay = true;
@@ -193,7 +230,7 @@ export class AuthInterceptor implements HttpInterceptor {
             }
             // Create a new HttpResponse and return it, so it can be handle properly by AuthService.
             const authResponse = new HttpResponse({
-              body: this.makeAuthStatusObject(false, null, error.error, location, error.headers ),
+              body: this.makeAuthStatusObject(false, null, error.error, location, error.headers),
               headers: error.headers,
               status: error.status,
               statusText: error.statusText,

src/app/core/auth/auth.reducer.ts

@@ -14,6 +14,7 @@ import {
 // import models
 import { EPerson } from '../eperson/models/eperson.model';
 import { AuthTokenInfo } from './models/auth-token-info.model';
+import {AuthMethodModel} from './models/auth-method.model';
 
 /**
  * The auth state.
@@ -50,6 +51,10 @@ export interface AuthState {
 
   // the authenticated user
   user?: EPerson;
+
+  // all authenticationMethods enabled at the backend
+  authMethods?: AuthMethodModel[];
+
 }
 
 /**
@@ -59,7 +64,8 @@ const initialState: AuthState = {
   authenticated: false,
   loaded: false,
   loading: false,
-  ssoLoginUrl: ''
+  ssoLoginUrl: '',
+  authMethods: new Array<AuthMethodModel>()
 };
 
 /**
@@ -200,15 +206,16 @@ export function authReducer(state: any = initialState, action: AuthActions): Aut
 
       // next three cases are used by shibboleth login
     case AuthActionTypes.RETRIEVE_AUTH_METHODS:
-      console.log(' case AuthActionTypes.RETRIEVE_AUTH_METHODS');
+      console.log('case AuthActionTypes.RETRIEVE_AUTH_METHODS');
       return Object.assign({}, state, {
         loading: true
       });
 
     case AuthActionTypes.RETRIEVE_AUTH_METHODS_SUCCESS:
+      console.log('case RETRIEVE_AUTH_METHODS_SUCCESS');
       return Object.assign({}, state, {
         loading: false,
-        ssoLoginUrl: (action as RetrieveAuthMethodsSuccessAction).payload
+        authMethods: (action as RetrieveAuthMethodsSuccessAction).payload
       });
 
     case AuthActionTypes.RETRIEVE_AUTH_METHODS_ERROR:

src/app/core/auth/auth.service.ts

@@ -24,6 +24,7 @@ import {Base64EncodeUrl} from '../../shared/utils/encode-decode.util';
 import {RemoteDataBuildService} from '../cache/builders/remote-data-build.service';
 import {GlobalConfig} from '../../../config/global-config.interface';
 import {GLOBAL_CONFIG} from '../../../config';
+import {AuthMethodModel} from './models/auth-method.model';
 
 export const LOGIN_ROUTE = '/login';
 export const LOGOUT_ROUTE = '/logout';
@@ -222,19 +223,19 @@ export class AuthService {
    * Retrieve authentication methods available
    * @returns {User}
    */
-  public retrieveAuthMethods(): Observable<string> {
+  public retrieveAuthMethods(): Observable<AuthMethodModel[]> {
     console.log('auth.service retrieveAuthMethods() was called');
     // return this.authRequestService.getRequest('login').pipe(
     return this.authRequestService.postToEndpoint('login', {}).pipe(
       map((status: AuthStatus) => {
-        let url = '';
+        let authMethods: AuthMethodModel[];
-        if (isNotEmpty(status.ssoLoginUrl)) {
+        if (isNotEmpty(status.authMethods)) {
           // url = this.parseSSOLocation(status.ssoLoginUrl);
           // console.log('Parsed SSOLoginUrl: ', url);
            // url = 'https://fis.tiss.tuwien.ac.at/Shibboleth.sso/Login?target=https://fis.tiss.tuwien.ac.at';
-          url = status.ssoLoginUrl;
+         authMethods = status.authMethods;
         }
-        return url;
+        return authMethods;
       })
     )
   }

src/app/core/auth/models/auth-method.model.ts

@@ -1,4 +1,9 @@
 export class AuthMethodModel {
   authMethodName: string;
   location?: string;
+
+  constructor(authMethodName: string, location?: string) {
+    this.authMethodName = authMethodName;
+    this.location = location;
+  }
 }

src/app/core/auth/models/auth-status.model.ts

@@ -53,8 +53,9 @@ export class AuthStatus implements CacheableObject {
    */
   self: string;
 
-  ssoLoginUrl: string;
+  /**
-
+   * All authentication methods enabled at the backend
+   */
   authMethods: AuthMethodModel[];
 
 }