Prevented normal users from changing own email

To address #1542

Updates to only allow email changes by users with the users-manage role
permission.

app/Http/Controllers/UserController.php

@@ -146,7 +146,12 @@ class UserController extends Controller
         ]);
 
         $user = $this->userRepo->getById($id);
-        $user->fill($request->all());
+        $user->fill($request->except(['email']));
+
+        // Email updates
+        if (userCan('users-manage') && $request->filled('email')) {
+            $user->email = $request->get('email');
+        }
 
         // Role updates
         if (userCan('users-manage') && $request->filled('roles')) {

resources/views/form/text.blade.php

@@ -1,6 +1,7 @@
 <input type="text" id="{{ $name }}" name="{{ $name }}"
        @if($errors->has($name)) class="text-neg" @endif
        @if(isset($placeholder)) placeholder="{{$placeholder}}" @endif
+       @if(isset($disabled) && $disabled) disabled="disabled" @endif
        @if(isset($tabindex)) tabindex="{{$tabindex}}" @endif
        @if(isset($model) || old($name)) value="{{ old($name) ? old($name) : $model->$name}}" @endif>
 @if($errors->has($name))

resources/views/users/form.blade.php

@@ -19,7 +19,7 @@
         <div>
             @if($authMethod !== 'ldap' || userCan('users-manage'))
                 <label for="email">{{ trans('auth.email') }}</label>
-                @include('form.text', ['name' => 'email'])
+                @include('form.text', ['name' => 'email', 'disabled' => !userCan('users-manage')])
             @endif
         </div>
     </div>

tests/Permissions/RolesTest.php

@@ -119,6 +119,43 @@ class RolesTest extends BrowserKitTest
         $this->actingAs($this->user)->visit('/')->dontSee($usersLink);
     }
 
+    public function test_user_cannot_change_email_unless_they_have_manage_users_permission()
+    {
+        $userProfileUrl = '/settings/users/' . $this->user->id;
+        $originalEmail = $this->user->email;
+        $this->actingAs($this->user);
+
+        $this->visit($userProfileUrl)
+            ->assertResponseOk()
+            ->seeElement('input[name=email][disabled]');
+        $this->put($userProfileUrl, [
+            'name' => 'my_new_name',
+            'email' => 'new_email@example.com',
+        ]);
+        $this->seeInDatabase('users', [
+            'id' => $this->user->id,
+            'email' => $originalEmail,
+            'name' => 'my_new_name',
+        ]);
+
+        $this->giveUserPermissions($this->user, ['users-manage']);
+
+        $this->visit($userProfileUrl)
+            ->assertResponseOk()
+            ->dontSeeElement('input[name=email][disabled]')
+            ->seeElement('input[name=email]');
+        $this->put($userProfileUrl, [
+            'name' => 'my_new_name_2',
+            'email' => 'new_email@example.com',
+        ]);
+
+        $this->seeInDatabase('users', [
+            'id' => $this->user->id,
+            'email' => 'new_email@example.com',
+            'name' => 'my_new_name_2',
+        ]);
+    }
+
     public function test_user_roles_manage_permission()
     {
         $this->actingAs($this->user)->visit('/settings/roles')