I am posting my solution here, since I wasted a lot of time getting available plugin working for my environments. The implementation provided by keycloak-js is fairly outdated. So if you try to use it for an ionic-3 app, it just doesn't work.
My solution to get this working is using InAppBrowser plugin (similar to cordova approach of keycloak-js) and follow standard Oauth2 authorization_code procedure. I had a look into the code of keycloak-js and implemented solution based on it. Thanks to keycloak-js too.
Here it is.
Step1: Install [cordova-inapp-browser][1].
Step2: A sample keycloak-auth.service.ts could look like below. This could potentially replace keycloak-js, but only for cordova option.
import 'rxjs/add/operator/toPromise'
import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http'
import {Injectable} from '@angular/core'
import {JwtHelperService} from '@auth0/angular-jwt'
import {StorageService} from '../../../core/services/storage.service'
import {StorageKeys} from '../../../shared/enums/storage'
import {InAppBrowser, InAppBrowserOptions} from '@ionic-native/in-app-browser';
const uuidv4 = require('uuid/v4');
@Injectable()
export class AuthService {
URI_base: 'https://my-server-location/auth';
keycloakConfig: any;
constructor(
public http: HttpClient,
public storage: StorageService,
private jwtHelper: JwtHelperService,
private inAppBrowser: InAppBrowser,
) {
this.keycloakConfig = {
authServerUrl: 'https://my-server-location/auth/', //keycloak-url
realm: 'myrealmmName', //realm-id
clientId: 'clientId', // client-id
redirectUri: 'http://my-demo-app/callback/', //callback-url registered for client.
// This can be anything, but should be a valid URL
};
}
public keycloakLogin(login: boolean): Promise<any> {
return new Promise((resolve, reject) => {
const url = this.createLoginUrl(this.keycloakConfig, login);
const options: InAppBrowserOptions = {
zoom: 'no',
location: 'no',
clearsessioncache: 'yes',
clearcache: 'yes'
}
const browser = this.inAppBrowser.create(url, '_blank', options);
const listener = browser.on('loadstart').subscribe((event: any) => {
const callback = encodeURI(event.url);
//Check the redirect uri
if (callback.indexOf(this.keycloakConfig.redirectUri) > -1) {
listener.unsubscribe();
browser.close();
const code = this.parseUrlParamsToObject(event.url);
this.getAccessToken(this.keycloakConfig, code).then(
() => {
const token = this.storage.get(StorageKeys.OAUTH_TOKENS);
resolve(token);
},
() => reject("Count not login in to keycloak")
);
}
});
});
}
parseUrlParamsToObject(url: any) {
const hashes = url.slice(url.indexOf('?') + 1).split('&');
return hashes.reduce((params, hash) => {
const [key, val] = hash.split('=');
return Object.assign(params, {[key]: decodeURIComponent(val)})
}, {});
}
createLoginUrl(keycloakConfig: any, isLogin: boolean) {
const state = uuidv4();
const nonce = uuidv4();
const responseMode = 'query';
const responseType = 'code';
const scope = 'openid';
return this.getUrlForAction(keycloakConfig, isLogin) +
'?client_id=' + encodeURIComponent(keycloakConfig.clientId) +
'&state=' + encodeURIComponent(state) +
'&redirect_uri=' + encodeURIComponent(keycloakConfig.redirectUri) +
'&response_mode=' + encodeURIComponent(responseMode) +
'&response_type=' + encodeURIComponent(responseType) +
'&scope=' + encodeURIComponent(scope) +
'&nonce=' + encodeURIComponent(nonce);
}
getUrlForAction(keycloakConfig: any, isLogin: boolean) {
return isLogin ? this.getRealmUrl(keycloakConfig) + '/protocol/openid-connect/auth'
: this.getRealmUrl(keycloakConfig) + '/protocol/openid-connect/registrations';
}
loadUserInfo() {
return this.storage.get(StorageKeys.OAUTH_TOKENS).then( tokens => {
const url = this.getRealmUrl(this.keycloakConfig) + '/protocol/openid-connect/userinfo';
const headers = this.getAccessHeaders(tokens.access_token, 'application/json');
return this.http.get(url, {headers: headers}).toPromise();
})
}
getAccessToken(kc: any, authorizationResponse: any) {
const URI = this.getTokenUrl();
const body = this.getAccessTokenParams(authorizationResponse.code, kc.clientId, kc.redirectUri);
const headers = this.getTokenRequestHeaders();
return this.createPostRequest(URI, body, {
header: headers,
}).then((newTokens: any) => {
newTokens.iat = (new Date().getTime() / 1000) - 10; // reduce 10 sec to for delay
this.storage.set(StorageKeys.OAUTH_TOKENS, newTokens);
});
}
refresh() {
return this.storage.get(StorageKeys.OAUTH_TOKENS)
.then(tokens => {
const decoded = this.jwtHelper.decodeToken(tokens.access_token)
if (decoded.iat + tokens.expires_in < (new Date().getTime() /1000)) {
const URI = this.getTokenUrl();
const headers = this.getTokenRequestHeaders();
const body = this.getRefreshParams(tokens.refresh_token, this.keycloakConfig.clientId);
return this.createPostRequest(URI, body, {
headers: headers
})
} else {
return tokens
}
})
.then(newTokens => {
newTokens.iat = (new Date().getTime() / 1000) - 10;
return this.storage.set(StorageKeys.OAUTH_TOKENS, newTokens)
})
.catch((reason) => console.log(reason))
}
createPostRequest(uri, body, headers) {
return this.http.post(uri, body, headers).toPromise()
}
getAccessHeaders(accessToken, contentType) {
return new HttpHeaders()
.set('Authorization', 'Bearer ' + accessToken)
.set('Content-Type', contentType);
}
getRefreshParams(refreshToken, clientId) {
return new HttpParams()
.set('grant_type', 'refresh_token')
.set('refresh_token', refreshToken)
.set('client_id', encodeURIComponent(clientId))
}
getAccessTokenParams(code , clientId, redirectUrl) {
return new HttpParams()
.set('grant_type', 'authorization_code')
.set('code', code)
.set('client_id', encodeURIComponent(clientId))
.set('redirect_uri', redirectUrl);
}
getTokenUrl() {
return this.getRealmUrl(this.keycloakConfig) + '/protocol/openid-connect/token';
}
getTokenRequestHeaders() {
const headers = new HttpHeaders()
.set('Content-Type', 'application/x-www-form-urlencoded');
const clientSecret = (this.keycloakConfig.credentials || {}).secret;
if (this.keycloakConfig.clientId && clientSecret) {
headers.set('Authorization', 'Basic ' + btoa(this.keycloakConfig.clientId + ':' + clientSecret));
}
return headers;
}
getRealmUrl(kc: any) {
if (kc && kc.authServerUrl) {
if (kc.authServerUrl.charAt(kc.authServerUrl.length - 1) == '/') {
return kc.authServerUrl + 'realms/' + encodeURIComponent(kc.realm);
} else {
return kc.authServerUrl + '/realms/' + encodeURIComponent(kc.realm);
}
} else {
return undefined;
}
}
}
Step 3: Then you can use this service in your components to what is necessary.
@Component({
selector: 'page-enrolment',
templateUrl: 'enrolment-page.component.html'
})
export class EnrolmentPageComponent {
constructor(
public storage: StorageService,
private authService: AuthService,
) {}
goToRegistration() {
this.loading = true;
this.authService.keycloakLogin(false)
.then(() => {
return this.authService.retrieveUserInformation(this.language)
});
}
}
Note: keycloakLogin(true) takes you to login page or keycloakLogin(false) takes you to registration page of keycloak.
I hope this helps you solve it more or less.
