Correct the solution to get the content type

[yopaz-giapnh]

line-bot-sdk-ruby/lib/line/bot/client.rb

Lines 1078 to 1083 in 147323c

	case file.path
	when /\.jpe?g\z/i then 'image/jpeg'
	when /\.png\z/i then 'image/png'
	else
	raise ArgumentError, "invalid file extension: #{file.path}"
	end

If using the file with no extension, this caused an error. For eg: "/var/folders/m3/p364c0313fv0mhbl3llm4bvw0000gp/T/ActiveStorage-27-20210918-49325-1bu8npn"

[kimoto]

You're right, It's too difficult to use for content_type detection.
But you can use the following method to get the content_type of the file instead of the file extension.

irb> file = open('https://www.ruby-lang.org/images/header-ruby-logo.png')
irb> file.content-type
=> "image/png"

line-bot-sdk-ruby/lib/line/bot/client.rb

Lines 1072 to 1076 in 147323c

	if file.respond_to?(:content_type)
	content_type = file.content_type
	raise ArgumentError, "invalid content type: #{content_type}" unless ['image/jpeg', 'image/png'].include?(content_type)
	content_type

But this use case is required use open-uri :(
https://ruby-doc.org/stdlib-2.5.1/libdoc/open-uri/rdoc/OpenURI/Meta.html#method-i-content_type

In my opinion, I think it would be good to be able to pass the content_type as an argument.