Angular-oauth2-oidc: Support for prefix on storage

[vasicvuk]

If you are running two applications on the same host name both applications will share same local storage so it will be nice to have possibility to add prefix to access_token, expires_at and other properties that are saved in storage of the browser so two applications can work each with their own token on the same host.

[ydg]

This is currently achievable by specifying your own storage implementation and passing it via OAuthService's setStorage method. In your implementation you can pass a prefix value in the constructor and use it in the getItem, removeItem, setItem methods.

[ydg]

export class MyStorage {

    _storage: Storage;
    _prefix: string = "";

    constructor(storage: Storage, prefix: string = "") {
        super();

        this._storage = storage;
        this._prefix = prefix + "_";
    }

    private makeKey(key: string): string {
        return this._prefix + key;
    }

    getItem(key: string): string | null {
        return this._storage.getItem(this.makeKey(key));
    }

    removeItem(key: string): void {
        this._storage.removeItem(this.makeKey(key));
    }

    setItem(key: string, data: string): void {
        this._storage.setItem(this.makeKey(key), data);
    }
}