allow mods to delete topics

apps/topics.lua

@@ -194,4 +194,20 @@ app:post("topic_edit", "/:slug/edit", function(self)
   return {redirect_to = self:url_for("topic", {slug = self.params.slug})}
 end)
 
+app:post("topic_delete", "/:slug/delete", function(self)
+  local user = util.get_logged_in_user(self)
+  if not user then
+    return {redirect_to = self:url_for("topic", {slug = self.params.slug})}
+  end
+  
+  if not user:is_mod() then
+    return {redirect_to = self:url_for("topic", {slug = self.params.slug})}
+  end
+  
+  local topic = Topics:find({slug = self.params.slug})
+  topic:delete()
+  util.inject_infobox(self, "Topic deleted.")
+  return {redirect_to = self:url_for("all_topics")}
+end)
+
 return app

js/topic.js

@@ -0,0 +1,16 @@
+{
+  const deleteDialog = document.getElementById("delete-dialog");
+  const deleteDialogOpenButton = document.getElementById("topic-delete-dialog-open");
+  deleteDialogOpenButton.addEventListener("click", (e) => {
+    deleteDialog.showModal();
+  });
+  const deleteDialogCloseButton = document.getElementById("topic-delete-dialog-close");
+  deleteDialogCloseButton.addEventListener("click", (e) => {
+    deleteDialog.close();
+  })
+  deleteDialog.addEventListener("click", (e) => {
+    if (e.target === deleteDialog) {
+      deleteDialog.close();
+    }
+  })
+}

views/topics/topic.etlua

@@ -21,6 +21,7 @@
       <input type="hidden" name="is_locked" value="<%= not is_locked %>">
       <input class="warn" type="submit" id="lock" value="<%= is_locked and "Unlock topic" or "Lock topic" %>">
     </form>
+    <button type="button" class="critical" id="topic-delete-dialog-open">Delete</button>
   <% end %>
   </div>
 </nav>
@@ -70,3 +71,15 @@
 <nav id="bottomnav">
   <% render("views.common.pagination", {page_count = pages, current_page = page}) %>
 </nav>
+<dialog id="delete-dialog">
+  <div class=delete-dialog-inner>
+    Are you sure you want to delete this topic?
+    <span>
+      <button id=topic-delete-dialog-close>Cancel</button>
+      <button class="critical" form=topic-delete-form>Delete</button>
+      <form id="topic-delete-form" method="post" action="<%= url_for("topic_delete", {slug = topic.slug}) %>"></form>
+    </span>
+  </div>
+</dialog>
+
+<script src="/static/js/topic.js"></script>

views/topics/topics.etlua

@@ -6,6 +6,10 @@
   <% end %>
 </nav>
 
+<% if infobox then %>
+  <% render("views.common.infobox", infobox) %>
+<% end %>
+
 <% if #topic_list == 0 then %>
   <p>There are no topics.</p>
 <% else %>