1 files changed, 46 insertions, 0 deletions
diff --git a/lib/pleroma/web/common_api/common_api.ex b/lib/pleroma/web/common_api/common_api.ex
index 374967a1b..f54f8a7b9 100644
--- a/lib/pleroma/web/common_api/common_api.ex
+++ b/lib/pleroma/web/common_api/common_api.ex
@@ -119,6 +119,52 @@ defmodule Pleroma.Web.CommonAPI do
     end
   end
 
+  def vote(user, object, choices) do
+    with "Question" <- object.data["type"],
+         {:author, false} <- {:author, object.data["actor"] == user.ap_id},
+         {:existing_votes, []} <- {:existing_votes, Utils.get_existing_votes(user.ap_id, object)},
+         {options, max_count} <- get_options_and_max_count(object),
+         option_count <- Enum.count(options),
+         {:choice_check, {choices, true}} <-
+           {:choice_check, normalize_and_validate_choice_indices(choices, option_count)},
+         {:count_check, true} <- {:count_check, Enum.count(choices) <= max_count} do
+      answer_activities =
+        Enum.map(choices, fn index ->
+          answer_data = make_answer_data(user, object, Enum.at(options, index)["name"])
+
+          ActivityPub.create(%{
+            to: answer_data["to"],
+            actor: user,
+            context: object.data["context"],
+            object: answer_data,
+            additional: %{"cc" => answer_data["cc"]}
+          })
+        end)
+
+      {:ok, answer_activities, object}
+    else
+      {:author, _} -> {:error, "Already voted"}
+      {:existing_votes, _} -> {:error, "Already voted"}
+      {:choice_check, {_, false}} -> {:error, "Invalid indices"}
+      {:count_check, false} -> {:error, "Too many choices"}
+    end
+  end
+
+  defp get_options_and_max_count(object) do
+    if Map.has_key?(object.data, "anyOf") do
+      {object.data["anyOf"], Enum.count(object.data["anyOf"])}
+    else
+      {object.data["oneOf"], 1}
+    end
+  end
+
+  defp normalize_and_validate_choice_indices(choices, count) do
+    Enum.map_reduce(choices, true, fn index, valid ->
+      index = if is_binary(index), do: String.to_integer(index), else: index
+      {index, if(valid, do: index < count, else: valid)}
+    end)
+  end
+
   def get_visibility(%{"visibility" => visibility}, in_reply_to)
       when visibility in ~w{public unlisted private direct},
       do: {visibility, get_replied_to_visibility(in_reply_to)}