Add cleanup methods for file uploads and temporary files

Author: sdogruyol

src/kemal/file_upload.cr

@@ -20,5 +20,10 @@ module Kemal
       @read_time = upload.read_time
       @size = upload.size
     end
+
+    def cleanup
+      @tempfile.close
+      ::File.delete(@tempfile.path) if ::File.exists?(@tempfile.path)
+    end
   end
 end

src/kemal/param_parser.cr

@@ -24,6 +24,15 @@ module Kemal
       @files_parsed = false
     end
 
+    def cleanup_temporary_files
+      return if @files.empty? && @all_files.empty?
+
+      @files.each_value &.cleanup
+      @all_files.each_value do |file_uploads|
+        file_uploads.each &.cleanup
+      end
+    end
+
     private def unescape_url_param(value : String)
       value.empty? ? value : URI.decode(value)
     rescue

src/kemal/route_handler.cr

@@ -47,16 +47,21 @@ module Kemal
 
     # Processes the route if it's a match. Otherwise renders 404.
     private def process_request(context)
-      raise Kemal::Exceptions::RouteNotFound.new(context) unless context.route_found?
-      return if context.response.closed?
-      content = context.route.handler.call(context)
+      begin
+        raise Kemal::Exceptions::RouteNotFound.new(context) unless context.route_found?
+        return if context.response.closed?
+        content = context.route.handler.call(context)
 
-      if !Kemal.config.error_handlers.empty? && Kemal.config.error_handlers.has_key?(context.response.status_code)
-        raise Kemal::Exceptions::CustomException.new(context)
-      end
+        if !Kemal.config.error_handlers.empty? && Kemal.config.error_handlers.has_key?(context.response.status_code)
+          raise Kemal::Exceptions::CustomException.new(context)
+        end
+
+        context.response.print(content)
 
-      context.response.print(content)
-      context
+        context
+      ensure
+        context.params.cleanup_temporary_files
+      end
     end
 
     private def radix_path(method, path)