consumes attachments for ID

lib/plantid_discord_bot.ex

@@ -26,4 +26,12 @@ defmodule PlantIdDiscordBot.Consumer do
       "id" -> Cog.PlantNet.id(interaction)
     end
   end
+
+  def handle_event({:MESSAGE_CREATE, %{attachments: attachments} = message, _ws_state}) do
+    if length(attachments) > 0 do
+      # deprecated -> Nostrum.Api.Channel.start_typing/1 in v1.0
+      Api.start_typing!(message.channel_id)
+      Cog.PlantNetMessage.id(message)
+    end
+  end
 end

lib/plantid_discord_bot/cogs/plantnet_message.ex

@@ -0,0 +1,141 @@
+defmodule PlantIdDiscordBot.Cog.PlantNetMessage do
+  require Logger
+
+  use Nostrum.Consumer
+  alias Nostrum.Api
+  alias PlantIdDiscordBot.RateLimiter
+  alias PlantIdDiscordBot.FileServer.File
+  alias PlantIdDiscordBot.PlantNet.Parser
+  alias Nostrum.Cache.GuildCache
+  alias PlantIdDiscordBot.Metrics
+
+  # @api Application.compile_env(:plantid_discord_bot, :api)
+  @plantnet_api_base_url Application.compile_env(:plantid_discord_bot, :plantnet_api_base_url)
+  @max_results Application.compile_env(:plantid_discord_bot, :max_results)
+
+  def id(message) do
+    IO.inspect(message)
+
+    case RateLimiter.check_limit(message.guild_id) do
+      {:limit_exceeded, _} ->
+        Api.create_message(message.channel_id,
+          content:
+            "This server has exceeded its allowed requests in 24 hours. Please try again tomorrow.",
+          message_reference: %{message_id: message.id}
+        )
+
+      {:ok, _} ->
+        do_identification(message)
+    end
+  end
+
+  def do_identification(message) do
+    saved_images =
+      try do
+        Enum.map(message.attachments, fn attachment -> attachment.url end)
+        |> File.download_and_save_files!()
+      rescue
+        e in ArgumentError ->
+          Api.create_message(message.channel_id, content: e.message)
+          nil
+      end
+
+    if saved_images do
+      try do
+        prepare_images(saved_images)
+        |> build_query_uri()
+        |> get_response(message)
+      rescue
+        e ->
+          Logger.error(Exception.format(:error, e, __STACKTRACE__))
+          Api.create_message(message.channel_id, "An error occurred. This error has been logged.")
+      after
+        cleanup_saved_images(saved_images)
+      end
+    end
+  end
+
+  defp prepare_images(saved_images) do
+    case Application.get_env(:plantid_discord_bot, :environment) do
+      :test ->
+        PlantIdDiscordBotTest.Mocks.PlantNet.Images.images()
+
+      :dev ->
+        PlantIdDiscordBotTest.Mocks.PlantNet.Images.images()
+
+      _ ->
+        Enum.map(saved_images, fn {:ok, filename} ->
+          "#{Application.get_env(:plantid_discord_bot, :fileserver_url)}/#{filename}"
+        end)
+    end
+  end
+
+  defp get_response(query_uri, message) do
+    guild_id = message.guild_id
+    {:ok, %{name: guild_name}} = GuildCache.get(guild_id)
+
+    case HTTPoison.get(query_uri) do
+      {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
+        response_message = Parser.parse(body)
+
+        RateLimiter.increase_counter(guild_id)
+        Metrics.put(guild_id, guild_name)
+
+        # Nostrum.Api.create_message/2 is deprecated but the new function is not available in v0.10 of the library
+        # Nostrum.Api.message/2 will be the new function
+        Api.create_message(message.channel_id,
+          content: response_message,
+          message_reference: %{message_id: message.id}
+        )
+
+      {:ok, %HTTPoison.Response{status_code: 401, body: body}} ->
+        Logger.critical("Unauthorized request to PlantNet API: #{body}")
+
+        Api.create_message(message.channel_id,
+          content: "Unauthorized request to PlantNet API.",
+          message_reference: %{message_id: message.id}
+        )
+
+      {:ok, %HTTPoison.Response{status_code: 404}} ->
+        RateLimiter.increase_counter(guild_id)
+        Metrics.put(guild_id, guild_name)
+
+        Api.create_message(message.application_id,
+          content: "Species Not Found",
+          message_reference: %{message_id: message.id}
+        )
+
+      {:ok, %HTTPoison.Response{status_code: 429}} ->
+        Logger.warning("Request limit exceeded for the PlantNet API")
+
+        Api.create_message(message.application_id,
+          content: "Too Many Requests",
+          message_reference: %{message_id: message.id}
+        )
+
+      {_, _} ->
+        Logger.error("Internal server error when contacting the PlantNet API")
+
+        Api.create_message(message.application_id,
+          content: "Internal Server Error",
+          message_reference: %{message_id: message.id}
+        )
+    end
+  end
+
+  @spec build_query_uri([String.t()]) :: String.t()
+  defp build_query_uri(image_filenames) do
+    URI.parse(
+      "#{@plantnet_api_base_url}/identify/all?api-key=#{Application.get_env(:plantid_discord_bot, :plantnet_api_key)}"
+    )
+    |> URI.append_query("images=#{Enum.join(image_filenames, "&images=")}")
+    |> URI.append_query("nb-results=#{@max_results}")
+    |> URI.append_query("type=kt")
+    |> URI.to_string()
+  end
+
+  defp cleanup_saved_images(saved_images) do
+    Enum.map(saved_images, fn {:ok, filename} -> filename end)
+    |> File.delete_files!()
+  end
+end