refactor: stricer domain: notifications

toju-app/src/app/domains/authentication/application/services/authentication.service.ts

@@ -0,0 +1,90 @@
+/* eslint-disable @typescript-eslint/member-ordering */
+import { Injectable, inject } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { type ServerEndpoint, ServerDirectoryFacade } from '../../../server-directory';
+import type { LoginResponse } from '../../domain/models/authentication.model';
+
+/**
+ * Handles user authentication (login and registration) against a
+ * configurable back-end server.
+ *
+ * The target server is resolved via {@link ServerDirectoryFacade}: the
+ * caller may pass an explicit `serverId`, otherwise the currently active
+ * server endpoint is used.
+ */
+@Injectable({ providedIn: 'root' })
+export class AuthenticationService {
+  private readonly http = inject(HttpClient);
+  private readonly serverDirectory = inject(ServerDirectoryFacade);
+
+  /**
+   * Resolve the API base URL for the given server.
+   *
+   * @param serverId - Optional server ID to look up. When omitted the
+   *   currently active endpoint is used.
+   * @returns Fully-qualified API base URL (e.g. `http://host:3001/api`).
+   */
+  private endpointFor(serverId?: string): string {
+    let endpoint: ServerEndpoint | undefined;
+
+    if (serverId) {
+      endpoint = this.serverDirectory.servers().find(
+        (server) => server.id === serverId
+      );
+    }
+
+    const activeEndpoint = endpoint ?? this.serverDirectory.activeServer();
+
+    return activeEndpoint
+      ? `${activeEndpoint.url}/api`
+      : this.serverDirectory.getApiBaseUrl();
+  }
+
+  /**
+   * Register a new user account on the target server.
+   *
+   * @param params - Registration parameters.
+   * @param params.username  - Desired login username.
+   * @param params.password  - Account password.
+   * @param params.displayName - Optional display name (defaults to username on the server).
+   * @param params.serverId  - Optional server ID to register against.
+   * @returns Observable emitting the {@link LoginResponse} on success.
+   */
+  register(params: {
+    username: string;
+    password: string;
+    displayName?: string;
+    serverId?: string;
+  }): Observable<LoginResponse> {
+    const url = `${this.endpointFor(params.serverId)}/users/register`;
+
+    return this.http.post<LoginResponse>(url, {
+      username: params.username,
+      password: params.password,
+      displayName: params.displayName
+    });
+  }
+
+  /**
+   * Log in to an existing user account on the target server.
+   *
+   * @param params - Login parameters.
+   * @param params.username - Login username.
+   * @param params.password - Account password.
+   * @param params.serverId - Optional server ID to authenticate against.
+   * @returns Observable emitting the {@link LoginResponse} on success.
+   */
+  login(params: {
+    username: string;
+    password: string;
+    serverId?: string;
+  }): Observable<LoginResponse> {
+    const url = `${this.endpointFor(params.serverId)}/users/login`;
+
+    return this.http.post<LoginResponse>(url, {
+      username: params.username,
+      password: params.password
+    });
+  }
+}