Simplify file upload parsing and support multiple uploads with same name (#458)

CHANGELOG.md

@@ -1,3 +1,23 @@
+# Next
+
+- `env.params.files` is now an `Array(FileUpload)`. You can iterate over to access the images.
+
+```ruby
+env.params.files.each do |file|
+
+  filename = file.filename
+
+  if !filename.is_a?(String)
+    "No filename included in upload"
+  else
+    file_path = ::File.join [Kemal.config.public_folder, "uploads/", filename]
+    File.open(file_path, "w") do |f|
+    IO.copy(file.tmpfile, f)
+  end
+  "Upload OK"
+end
+```
+
 # 0.23.0 (17-06-2018)
 
 - Crystal 0.25.0 support 🎉

src/kemal/param_parser.cr

@@ -16,7 +16,7 @@ module Kemal
       @query = HTTP::Params.new({} of String => Array(String))
       @body = HTTP::Params.new({} of String => Array(String))
       @json = {} of String => AllParamTypes
-      @files = {} of String => FileUpload
+      @files = [] of FileUpload
       @url_parsed = false
       @query_parsed = false
       @body_parsed = false
@@ -71,7 +71,7 @@ module Kemal
         next unless upload
         filename = upload.filename
         if !filename.nil?
-          @files[upload.name] = FileUpload.new(upload: upload)
+          @files << FileUpload.new(upload: upload)
         else
           @body.add(upload.name, upload.body.gets_to_end)
         end