<p></p>
<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4301#discussion_r1367859205">app/controllers/api/user_blocks_controller.rb</a>:</p>
<pre style='color:#555'>> +    def create
+      raise OSM::APIBadUserInput, "No user was given" unless params[:user]
+
+      user = User.visible.find_by(:id => params[:user])
+      raise OSM::APINotFoundError unless user
+      raise OSM::APIBadUserInput, "No reason was given" unless params[:reason]
+      raise OSM::APIBadUserInput, "No period was given" unless params[:period]
+
+      period = Integer(params[:period], :exception => false)
+      raise OSM::APIBadUserInput, "Period one is in a wrong format" unless period
+
+      max_period = UserBlock::PERIODS.max
+      raise OSM::APIBadUserInput, "Period must be between 0 and #{max_period}" if period.negative? || period > max_period
+      raise OSM::APIBadUserInput, "Needs_view must be true if provided" unless params[:needs_view].nil? || params[:needs_view] == "true"
+
+      @user_block = UserBlock.create(
</pre>
<p dir="auto">They might notice it quickly. However, an attacker might create hundreds or thousands of user blocks for mod accounts, so it would require an admin to revoke all user blocks and make the mod accounts usable again.</p>

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