Guests: Prevented access to profile routes

Prevention of action on certain routes for guest user when public access
is enabled. Could not see a way this could be a security issue, beyond a
mild nuisance that'd only be visible if public users can edit, which
would present larger potential nuisance anyway.

app/Users/Controllers/UserController.php

@@ -103,6 +103,7 @@ public function store(Request $request)
      */
     public function edit(int $id, SocialAuthService $socialAuthService)
     {
+        $this->preventGuestAccess();
         $this->checkPermissionOrCurrentUser('users-manage', $id);
 
         $user = $this->userRepo->getById($id);
@@ -133,6 +134,7 @@ public function edit(int $id, SocialAuthService $socialAuthService)
     public function update(Request $request, int $id)
     {
         $this->preventAccessInDemoMode();
+        $this->preventGuestAccess();
         $this->checkPermissionOrCurrentUser('users-manage', $id);
 
         $validated = $this->validate($request, [
@@ -176,6 +178,7 @@ public function update(Request $request, int $id)
      */
     public function delete(int $id)
     {
+        $this->preventGuestAccess();
         $this->checkPermissionOrCurrentUser('users-manage', $id);
 
         $user = $this->userRepo->getById($id);
@@ -192,6 +195,7 @@ public function delete(int $id)
     public function destroy(Request $request, int $id)
     {
         $this->preventAccessInDemoMode();
+        $this->preventGuestAccess();
         $this->checkPermissionOrCurrentUser('users-manage', $id);
 
         $user = $this->userRepo->getById($id);

tests/PublicActionTest.php

@@ -207,4 +207,16 @@ public function test_public_view_can_take_on_other_roles()
 
         $this->withHtml($resp)->assertLinkExists($page->getUrl('/edit'));
     }
+
+    public function test_public_user_cannot_view_or_update_their_profile()
+    {
+        $this->setSettings(['app-public' => 'true']);
+        $guest = $this->users->guest();
+
+        $resp = $this->get($guest->getEditUrl());
+        $this->assertPermissionError($resp);
+
+        $resp = $this->put($guest->getEditUrl(), ['name' => 'My new guest name']);
+        $this->assertPermissionError($resp);
+    }
 }