feat: Add Public APIs for API Channel (#2375)

app/controllers/public/api/v1/inboxes/messages_controller.rb

@@ -0,0 +1,68 @@
+class Public::Api::V1::Inboxes::MessagesController < Public::Api::V1::InboxesController
+  before_action :set_message, only: [:update]
+
+  def index
+    @messages = @conversation.nil? ? [] : message_finder.perform
+  end
+
+  def create
+    @message = @conversation.messages.new(message_params)
+    @message.save
+    build_attachment
+  end
+
+  def update
+    @message.update!(message_update_params)
+  rescue StandardError => e
+    render json: { error: @contact.errors, message: e.message }.to_json, status: 500
+  end
+
+  private
+
+  def build_attachment
+    return if params[:attachments].blank?
+
+    params[:attachments].each do |uploaded_attachment|
+      attachment = @message.attachments.new(
+        account_id: @message.account_id,
+        file_type: helpers.file_type(uploaded_attachment&.content_type)
+      )
+      attachment.file.attach(uploaded_attachment)
+    end
+    @message.save!
+  end
+
+  def message_finder_params
+    {
+      filter_internal_messages: true,
+      before: params[:before]
+    }
+  end
+
+  def message_finder
+    @message_finder ||= MessageFinder.new(@conversation, message_finder_params)
+  end
+
+  def message_update_params
+    params.permit(submitted_values: [:name, :title, :value])
+  end
+
+  def permitted_params
+    params.permit(:content, :echo_id)
+  end
+
+  def set_message
+    @message = @conversation.messages.find(params[:id])
+  end
+
+  def message_params
+    {
+      account_id: @conversation.account_id,
+      sender: @contact_inbox.contact,
+      content: permitted_params[:content],
+      inbox_id: @conversation.inbox_id,
+      echo_id: permitted_params[:echo_id],
+      message_type: :incoming
+    }
+  end
+end