[PM-5609] passphrase settings component & services (#10535)

libs/tools/generator/components/src/passphrase-settings.component.ts

@@ -0,0 +1,139 @@
+import { OnInit, Input, Output, EventEmitter, Component, OnDestroy } from "@angular/core";
+import { FormBuilder } from "@angular/forms";
+import { BehaviorSubject, skip, takeUntil, Subject } from "rxjs";
+
+import { AccountService } from "@bitwarden/common/auth/abstractions/account.service";
+import { UserId } from "@bitwarden/common/types/guid";
+import {
+  Generators,
+  CredentialGeneratorService,
+  PassphraseGenerationOptions,
+} from "@bitwarden/generator-core";
+
+import { DependenciesModule } from "./dependencies";
+import { completeOnAccountSwitch, toValidators } from "./util";
+
+const Controls = Object.freeze({
+  numWords: "numWords",
+  includeNumber: "includeNumber",
+  capitalize: "capitalize",
+  wordSeparator: "wordSeparator",
+});
+
+/** Options group for passphrases */
+@Component({
+  standalone: true,
+  selector: "bit-passphrase-settings",
+  templateUrl: "passphrase-settings.component.html",
+  imports: [DependenciesModule],
+})
+export class PassphraseSettingsComponent implements OnInit, OnDestroy {
+  /** Instantiates the component
+   *  @param accountService queries user availability
+   *  @param generatorService settings and policy logic
+   *  @param formBuilder reactive form controls
+   */
+  constructor(
+    private formBuilder: FormBuilder,
+    private generatorService: CredentialGeneratorService,
+    private accountService: AccountService,
+  ) {}
+
+  /** Binds the passphrase component to a specific user's settings.
+   *  When this input is not provided, the form binds to the active
+   *  user
+   */
+  @Input()
+  userId: UserId | null;
+
+  /** When `true`, an options header is displayed by the component. Otherwise, the header is hidden. */
+  @Input()
+  showHeader: boolean = true;
+
+  /** Emits settings updates and completes if the settings become unavailable.
+   * @remarks this does not emit the initial settings. If you would like
+   *   to receive live settings updates including the initial update,
+   *   use `CredentialGeneratorService.settings$(...)` instead.
+   */
+  @Output()
+  readonly onUpdated = new EventEmitter<PassphraseGenerationOptions>();
+
+  protected settings = this.formBuilder.group({
+    [Controls.numWords]: [Generators.Passphrase.settings.initial.numWords],
+    [Controls.wordSeparator]: [Generators.Passphrase.settings.initial.wordSeparator],
+    [Controls.capitalize]: [Generators.Passphrase.settings.initial.capitalize],
+    [Controls.includeNumber]: [Generators.Passphrase.settings.initial.includeNumber],
+  });
+
+  async ngOnInit() {
+    const singleUserId$ = this.singleUserId$();
+    const settings = await this.generatorService.settings(Generators.Passphrase, { singleUserId$ });
+
+    // skips reactive event emissions to break a subscription cycle
+    settings.pipe(takeUntil(this.destroyed$)).subscribe((s) => {
+      this.settings.patchValue(s, { emitEvent: false });
+    });
+
+    // the first emission is the current value; subsequent emissions are updates
+    settings.pipe(skip(1), takeUntil(this.destroyed$)).subscribe(this.onUpdated);
+
+    // dynamic policy enforcement
+    this.generatorService
+      .policy$(Generators.Passphrase, { userId$: singleUserId$ })
+      .pipe(takeUntil(this.destroyed$))
+      .subscribe((policy) => {
+        this.settings
+          .get(Controls.numWords)
+          .setValidators(toValidators(Controls.numWords, Generators.Passphrase, policy));
+
+        this.settings
+          .get(Controls.wordSeparator)
+          .setValidators(toValidators(Controls.wordSeparator, Generators.Passphrase, policy));
+
+        // forward word boundaries to the template (can't do it through the rx form)
+        // FIXME: move the boundary logic fully into the policy evaluator
+        this.minNumWords =
+          policy.numWords?.min ?? Generators.Passphrase.settings.constraints.numWords.min;
+        this.maxNumWords =
+          policy.numWords?.max ?? Generators.Passphrase.settings.constraints.numWords.max;
+
+        this.toggleEnabled(Controls.capitalize, !policy.policy.capitalize);
+        this.toggleEnabled(Controls.includeNumber, !policy.policy.includeNumber);
+      });
+
+    // now that outputs are set up, connect inputs
+    this.settings.valueChanges.pipe(takeUntil(this.destroyed$)).subscribe(settings);
+  }
+
+  /** attribute binding for numWords[min] */
+  protected minNumWords: number;
+
+  /** attribute binding for numWords[max] */
+  protected maxNumWords: number;
+
+  private toggleEnabled(setting: keyof typeof Controls, enabled: boolean) {
+    if (enabled) {
+      this.settings.get(setting).enable();
+    } else {
+      this.settings.get(setting).disable();
+    }
+  }
+
+  private singleUserId$() {
+    // FIXME: this branch should probably scan for the user and make sure
+    // the account is unlocked
+    if (this.userId) {
+      return new BehaviorSubject(this.userId as UserId).asObservable();
+    }
+
+    return this.accountService.activeAccount$.pipe(
+      completeOnAccountSwitch(),
+      takeUntil(this.destroyed$),
+    );
+  }
+
+  private readonly destroyed$ = new Subject<void>();
+  ngOnDestroy(): void {
+    this.destroyed$.complete();
+  }
+}