Feat: Cary over states using URL search params
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Joseph Garrone
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README.md
67
README.md
@ -45,9 +45,7 @@ Tested with the following Keycloak versions:
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- [Just changing the look](#just-changing-the-look)
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- [Changing the look **and** feel](#changing-the-look-and-feel)
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- [Hot reload](#hot-reload)
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- [How to implement context persistance](#how-to-implement-context-persistance)
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- [If your keycloak is a subdomain of your app.](#if-your-keycloak-is-a-subdomain-of-your-app)
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- [Else](#else)
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- [Implement context persistance (optional)](#implement-context-persistance-optional)
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- [GitHub Actions](#github-actions)
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- [REQUIREMENTS](#requirements)
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- [API Reference](#api-reference)
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@ -154,25 +152,64 @@ Checkout [this concrete example](https://github.com/garronej/keycloakify-demo-ap
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*NOTE: keycloak-react-theming was renamed keycloakify since this video was recorded*
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[](https://youtu.be/xTz0Rj7i2v8)
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# How to implement context persistance
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# Implement context persistance (optional)
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If you want dark mode preference, language and others users preferences
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to persist within the page served by keycloak here are the methods you can
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adopt.
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If, before logging in, a user has selected a specific language
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you don't want it to be reset to default when the user gets redirected to
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the login or register pages.
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Same goes for the dark mode, you don't want, if the user had it enabled
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to show the login page with light themes.
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The problem is that you are probably using `localStorage` to persist theses values across
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reload but, as the Keycloak pages are not served on the same domain that the rest of your
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app you won't be able to carry over states using `localStorage`.
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## If your keycloak is a subdomain of your app.
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The only reliable solution is to inject parameters into the URL before
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redirecting to Keycloak. We integrate with
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[`keycloak-js`](https://github.com/keycloak/keycloak-documentation/blob/master/securing_apps/topics/oidc/javascript-adapter.adoc),
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by providing you a way to tell `keycloak-js` that you would like to inject
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some search parameters before redirecting.
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E.g: Your app url is `my-app.com` and your keycloak url is `auth.my-app.com`.
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The method also works with [`@react-keycloak/web`](https://www.npmjs.com/package/@react-keycloak/web) (use the `initOptions`).
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In this case there is a very straightforward approach and it is to use [`powerhooks/useGlobalState`](https://github.com/garronej/powerhooks).
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Instead of `{ "persistance": "localStorage" }` use `{ "persistance": "cookie" }`.
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You can implement your own mechanism to pass the states in the URL and
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restore it on the other side but we recommend using `powerhooks/useGlobalState`
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from the library [`powerhooks`](https://www.powerhooks.dev) that provide an elegant
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way to handle states such as `isDarkModeEnabled` or `selectedLanguage`.
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## Else
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Let's modify [the example](https://github.com/keycloak/keycloak-documentation/blob/master/securing_apps/topics/oidc/javascript-adapter.adoc) from the official `keycloak-js` documentation to
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enables the states of `useGlobalStates` to be injected in the URL before redirecting.
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Note that the states are automatically restored on the other side by `powerhooks`
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You will have to use URL parameters to passes states when you redirect to
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the login page.
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```typescript
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import keycloak_js from "keycloak-js";
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import { injectGlobalStatesInSearchParams } from "powerhooks/useGlobalState";
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import { createKeycloakAdapter } from "keycloakify";
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TOTO: Provide a clean way, as abstracted as possible, way to do that.
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//...
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const keycloakInstance = keycloak_js({
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"url": "http://keycloak-server/auth",
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"realm": "myrealm",
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"clientId": "myapp"
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});
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keycloakInstance.init({
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"onLoad": 'check-sso',
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"silentCheckSsoRedirectUri": window.location.origin + "/silent-check-sso.html",
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"adapter": createKeycloakAdapter({
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"transformUrlBeforeRedirect": injectGlobalStatesInSearchParams,
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keycloakInstance
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})
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});
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//...
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```
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If you really want to go the extra miles and avoid having the white
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flash of the blank html before the js bundle have been evaluated
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[here is a snippet](https://github.com/InseeFrLab/onyxia-ui/blob/a77eb502870cfe6878edd0d956c646d28746d053/public/index.html#L5-L54) that you can place in your `public/index.html` if you are using `powerhooks/useGlobalState`.
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# GitHub Actions
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@ -12,6 +12,7 @@ export * from "./components/Info";
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export * from "./components/Error";
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export * from "./components/LoginResetPassword";
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export * from "./components/LoginVerifyEmail";
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export * from "./keycloakJsAdapter";
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export * from "./tools/assert";
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119
src/lib/keycloakJsAdapter.ts
Normal file
119
src/lib/keycloakJsAdapter.ts
Normal file
@ -0,0 +1,119 @@
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export declare namespace keycloak_js {
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export type KeycloakPromiseCallback<T> = (result: T) => void;
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export class KeycloakPromise<TSuccess, TError> extends Promise<TSuccess> {
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success(callback: KeycloakPromiseCallback<TSuccess>): KeycloakPromise<TSuccess, TError>;
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error(callback: KeycloakPromiseCallback<TError>): KeycloakPromise<TSuccess, TError>;
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}
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export interface KeycloakAdapter {
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login(options?: KeycloakLoginOptions): KeycloakPromise<void, void>;
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logout(options?: KeycloakLogoutOptions): KeycloakPromise<void, void>;
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register(options?: KeycloakLoginOptions): KeycloakPromise<void, void>;
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accountManagement(): KeycloakPromise<void, void>;
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redirectUri(options: { redirectUri: string; }, encodeHash: boolean): string;
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}
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export interface KeycloakLogoutOptions {
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redirectUri?: string;
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}
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export interface KeycloakLoginOptions {
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scope?: string;
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redirectUri?: string;
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prompt?: 'none' | 'login';
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action?: string;
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maxAge?: number;
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loginHint?: string;
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idpHint?: string;
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locale?: string;
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cordovaOptions?: { [optionName: string]: string };
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}
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export type KeycloakInstance = Record<
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"createLoginUrl" |
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"createLogoutUrl" |
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"createRegisterUrl",
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(options: KeycloakLoginOptions | undefined) => string
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> & {
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createAccountUrl(): string;
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redirectUri?: string;
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}
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}
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/**
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* NOTE: This is just a slightly modified version of the default adapter in keycloak-js
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* The goal here is just to be able to inject search param in url before keycloak redirect.
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* Our use case for it is to pass over the login screen the states of useGlobalState
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* namely isDarkModeEnabled, lgn...
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*/
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export function createKeycloakAdapter(
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params: {
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keycloakInstance: keycloak_js.KeycloakInstance;
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transformUrlBeforeRedirect(url: string): string;
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}
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): keycloak_js.KeycloakAdapter {
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const { keycloakInstance, transformUrlBeforeRedirect } = params;
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const neverResolvingPromise: keycloak_js.KeycloakPromise<void, void> = Object.defineProperties(
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new Promise(() => { }),
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{
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"success": { "value": () => { } },
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"error": { "value": () => { } }
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}
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);
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return {
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"login": options => {
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window.location.replace(
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transformUrlBeforeRedirect(
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keycloakInstance.createLoginUrl(
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options
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)
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)
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);
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return neverResolvingPromise;
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},
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"logout": options => {
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window.location.replace(
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transformUrlBeforeRedirect(
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keycloakInstance.createLogoutUrl(
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options
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)
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)
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);
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return neverResolvingPromise;
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},
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"register": options => {
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window.location.replace(
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transformUrlBeforeRedirect(
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keycloakInstance.createRegisterUrl(
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options
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)
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)
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);
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return neverResolvingPromise;
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},
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"accountManagement": () => {
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var accountUrl = transformUrlBeforeRedirect(keycloakInstance.createAccountUrl());
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if (typeof accountUrl !== 'undefined') {
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window.location.href = accountUrl;
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} else {
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throw new Error("Not supported by the OIDC server");
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}
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return neverResolvingPromise;
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},
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"redirectUri": options => {
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if (options && options.redirectUri) {
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return options.redirectUri;
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} else if (keycloakInstance.redirectUri) {
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return keycloakInstance.redirectUri;
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} else {
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return window.location.href;
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}
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}
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};
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}
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