src/app/store/root/effects/initialization.effect.ts

/********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/

import {Injectable} from "@angular/core";
import {Actions, createEffect, ofType} from "@ngrx/effects";
import {Action} from "@ngrx/store";
import {Observable, of} from "rxjs";
import {catchError, endWith, startWith, switchMap, take} from "rxjs/operators";
import {CoreApiService} from "../../../core/api";
import {AuthService} from "../../../core/auth";
import {EHttpStatusCodes, isHttpErrorWithStatus} from "../../../util";
import {
    completeInitializationAction,
    fetchVersionAction,
    intializeAction,
    keepSessionAliveAction,
    openExitPageAction,
    setUserAction,
    toggleLoadingPageAction
} from "../actions";
import {EExitCode} from "../model";

@Injectable({providedIn: "root"})
export class InitializationEffect {

    public readonly initialize$ = createEffect(() => this.actions$.pipe(
        ofType(intializeAction),
        take(1),
        switchMap(() => this.initialize())
    ));

    public constructor(
        private readonly actions$: Actions,
        private readonly authService: AuthService,
        private readonly coreApiService: CoreApiService
    ) {

    }

    public initialize(): Observable<Action> {
        return this.initializeAuthStatus().pipe(
            startWith(fetchVersionAction()),
            catchError(() => of(openExitPageAction({code: EExitCode.UNKNOWN}))),
            endWith(completeInitializationAction()),
            endWith(toggleLoadingPageAction({isLoading: false}))
        );
    }

    public initializeAuthStatus(): Observable<Action> {
        const hasToken = this.authService.initialize();

        if (!hasToken) {
            return of(openExitPageAction({code: EExitCode.NO_TOKEN}));
        }

        return this.coreApiService.getUserInfo().pipe(
            switchMap((user) => of(setUserAction({user}), keepSessionAliveAction())),
            catchError((err) => {
                if (isHttpErrorWithStatus(err, EHttpStatusCodes.UNAUTHORIZED)) {
                    return of(openExitPageAction({code: EExitCode.UNAUTHORIZED}));
                }

                if (isHttpErrorWithStatus(err, EHttpStatusCodes.FORBIDDEN)) {
                    return of(openExitPageAction({code: EExitCode.FORBIDDEN}));
                }

                return of(openExitPageAction({code: EExitCode.UNKNOWN}));
            })
        );
    }

}