feat: add alias creation UI with domain selector on profile page

Users can now generate a random disposable alias by selecting an
allowed domain from a dropdown and clicking "Generate alias", without
specifying a custom local part.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

login.go

@@ -165,12 +165,13 @@ func tryLogin(w http.ResponseWriter, r *http.Request) {
 	}
 
 	displayTmpl(w, "profile.html", map[string]any{
-		"login":     loginName,
-		"fields":    fields,
-		"emails":    emails,
-		"aliases":   aliases,
-		"api_token": apiToken,
-		"card_wide": true,
+		"login":          loginName,
+		"fields":         fields,
+		"emails":         emails,
+		"aliases":        aliases,
+		"api_token":      apiToken,
+		"alias_domains":  allowedAliasDomains,
+		"card_wide":      true,
 	})
 }
 

static/profile.html

@@ -3,7 +3,7 @@
 
   <nav class="tabs">
     <button class="tab-btn active" onclick="showTab(this,'account')">Account</button>
-    {{if or .emails .aliases}}<button class="tab-btn" onclick="showTab(this,'email')">Email &amp; Aliases</button>{{end}}
+    {{if or .emails .aliases .alias_domains}}<button class="tab-btn" onclick="showTab(this,'email')">Email &amp; Aliases</button>{{end}}
     <button class="tab-btn" onclick="showTab(this,'api')">API</button>
   </nav>
 
@@ -22,7 +22,7 @@
     {{end}}
   </div>
 
-  {{if or .emails .aliases}}
+  {{if or .emails .aliases .alias_domains}}
   <div id="tab-email" class="tab-panel hidden">
     {{if .emails}}
     <h3 class="section-title">Email addresses</h3>
@@ -47,6 +47,19 @@
       {{end}}
     </ul>
     {{end}}
+    {{if .alias_domains}}
+    <div class="alias-create">
+      <select id="alias-domain" class="alias-domain-select">
+        {{range .alias_domains}}
+        <option value="{{.}}">@{{.}}</option>
+        {{end}}
+      </select>
+      <button class="btn btn-primary btn-sm"
+              data-token="{{.api_token}}"
+              onclick="createAlias(this)">Generate alias</button>
+      <span id="alias-create-error" class="alias-create-error"></span>
+    </div>
+    {{end}}
   </div>
   {{end}}
 
@@ -72,5 +85,48 @@
       if (r.ok) document.getElementById(btn.dataset.elem).remove();
     });
   }
+  function createAlias(btn) {
+    var domain = document.getElementById('alias-domain').value;
+    var errEl = document.getElementById('alias-create-error');
+    errEl.textContent = '';
+    btn.disabled = true;
+    fetch('/api/v1/aliases', {
+      method: 'POST',
+      headers: {'Authorization': 'Bearer ' + btn.dataset.token, 'Content-Type': 'application/json'},
+      body: JSON.stringify({domain: domain})
+    }).then(function(r) {
+      btn.disabled = false;
+      if (!r.ok) { return r.text().then(function(t) { errEl.textContent = t; }); }
+      return r.json().then(function(data) {
+        var list = document.querySelector('.alias-list');
+        if (!list) {
+          var h = document.createElement('h3');
+          h.className = 'section-title';
+          h.textContent = 'Disposable aliases';
+          document.querySelector('.alias-create').before(h);
+          list = document.createElement('ul');
+          list.className = 'alias-list';
+          document.querySelector('.alias-create').before(list);
+        }
+        var idx = list.children.length;
+        var li = document.createElement('li');
+        li.id = 'alias-' + idx;
+        li.className = 'alias-item';
+        var span = document.createElement('span');
+        span.className = 'alias-value';
+        span.textContent = data.data.email;
+        var del = document.createElement('button');
+        del.className = 'btn btn-danger btn-sm';
+        del.dataset.alias = encodeURIComponent(data.data.email);
+        del.dataset.token = btn.dataset.token;
+        del.dataset.elem = li.id;
+        del.textContent = 'Delete';
+        del.onclick = function() { deleteAlias(del); };
+        li.appendChild(span);
+        li.appendChild(del);
+        list.appendChild(li);
+      });
+    });
+  }
   </script>
 {{template "footer" .}}

static/style.css

@@ -500,6 +500,28 @@ body {
   word-break: break-all;
 }
 
+.alias-create {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-top: 1rem;
+  flex-wrap: wrap;
+}
+
+.alias-domain-select {
+  font-size: 0.875rem;
+  padding: 0.25rem 0.5rem;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--surface);
+  color: var(--text);
+}
+
+.alias-create-error {
+  font-size: 0.8rem;
+  color: var(--danger);
+}
+
 /* ============================================================
    Profile: API tab
    ============================================================ */