ext(affordances): wirePasswordStrength via scheduleRate

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

extension/src/shared/form-affordances/__tests__/password-tools.test.ts

@@ -1,5 +1,5 @@
-import { describe, it, expect, beforeEach, afterEach } from 'vitest';
-import { wirePasswordReveal } from '../password-tools';
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { wirePasswordReveal, wirePasswordStrength } from '../password-tools';
 
 describe('wirePasswordReveal', () => {
   let form: HTMLElement;
@@ -47,3 +47,48 @@ describe('wirePasswordReveal', () => {
     expect(btn.title).toBe('reveal');
   });
 });
+
+describe('wirePasswordStrength', () => {
+  let form: HTMLElement;
+  let scheduleRate: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    form = document.createElement('div');
+    form.innerHTML = `
+      <input id="f-password" type="password" value="" />
+      <div id="strength-bar-row" class="strength-bar-row" hidden>
+        <div class="strength-bar"><span></span><span></span><span></span><span></span><span></span></div>
+        <div class="strength-label"></div>
+      </div>
+    `;
+    document.body.appendChild(form);
+    scheduleRate = vi.fn();
+  });
+
+  afterEach(() => {
+    document.body.removeChild(form);
+  });
+
+  it('shows bar with score class on input', () => {
+    scheduleRate.mockImplementation((_pw, cb) => cb({ score: 3, guessesLog10: 11.4 }));
+    wirePasswordStrength(form, { scheduleRate });
+    const input = form.querySelector('#f-password') as HTMLInputElement;
+    input.value = 'CorrectHorseBatteryStaple';
+    input.dispatchEvent(new Event('input'));
+    const row = form.querySelector('#strength-bar-row') as HTMLElement;
+    expect(row.hidden).toBe(false);
+    expect(row.querySelector('.strength-bar')?.className).toContain('s-good');
+    expect(row.querySelector('.strength-label')?.textContent).toContain('good');
+    expect(row.querySelector('.strength-label')?.textContent).toContain('10^11');
+  });
+
+  it('hides bar when input is empty', () => {
+    scheduleRate.mockImplementation((_pw, cb) => cb({ score: -1, guessesLog10: -1 }));
+    wirePasswordStrength(form, { scheduleRate });
+    const input = form.querySelector('#f-password') as HTMLInputElement;
+    input.value = '';
+    input.dispatchEvent(new Event('input'));
+    const row = form.querySelector('#strength-bar-row') as HTMLElement;
+    expect(row.hidden).toBe(true);
+  });
+});

extension/src/shared/form-affordances/password-tools.ts

@@ -1,4 +1,5 @@
 import { GLYPH_REVEAL, GLYPH_HIDE } from '../glyphs';
+import { STRENGTH_LABELS, entropyText, type Strength } from '../../setup/setup-helpers';
 
 /// Returns a teardown fn the caller must invoke on unmount.
 export function wirePasswordReveal(form: HTMLElement): () => void {
@@ -26,3 +27,41 @@ export function wirePasswordReveal(form: HTMLElement): () => void {
     btn.title = 'reveal';
   };
 }
+
+export interface PasswordStrengthOpts {
+  scheduleRate: (passphrase: string, cb: (s: Strength) => void) => void;
+}
+
+export function wirePasswordStrength(form: HTMLElement, opts: PasswordStrengthOpts): void {
+  const input = form.querySelector<HTMLInputElement>('#f-password');
+  const row = form.querySelector<HTMLElement>('#strength-bar-row');
+  if (!input || !row) return;
+  const bar = row.querySelector<HTMLElement>('.strength-bar');
+  const label = row.querySelector<HTMLElement>('.strength-label');
+  if (!bar || !label) return;
+
+  const update = () => {
+    const v = input.value;
+    if (!v) {
+      row.hidden = true;
+      return;
+    }
+    opts.scheduleRate(v, (s) => {
+      if (s.score < 0) { row.hidden = true; return; }
+      row.hidden = false;
+      // Reset score classes, then add the current one to the bar element.
+      bar.className = 'strength-bar';
+      const cls = STRENGTH_LABELS[s.score]?.cls ?? 's-very-weak';
+      bar.classList.add(cls);
+      // Light up segments 0..score (5-segment bar).
+      Array.from(bar.children).forEach((seg, i) => {
+        (seg as HTMLElement).classList.toggle('lit', i <= s.score);
+      });
+      const text = STRENGTH_LABELS[s.score]?.text ?? '?';
+      label.textContent = `${text} · ${entropyText(s.guessesLog10)}`;
+    });
+  };
+
+  input.addEventListener('input', update);
+  update();
+}