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app.rb
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app.rb
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require 'sinatra/base'
require 'mini_magick'
require 'json'
require 'securerandom'
class ImagesApp < Sinatra::Base
UNSUPPORTED_MEDIA_HTTP_CODE = 415
attr_reader :image_name, :fullpath, :image
helpers do
def random_name
SecureRandom.hex
end
def make_upload_folder
File.mkdir settings.static unless File.exist? settings.static
end
def valid_request?(params)
params['media'].is_a?(Hash) && File.exists?(params['media'][:tempfile])
end
def get_filename
@image_name = "#{random_name}.#{@image['format'].downcase}"
end
def get_fullpath
@fullpath = "#{settings.static}/#{get_filename}"
end
def save
@image.write @fullpath
File.chmod 0755, @fullpath
end
end
post '/upload' do
halt UNSUPPORTED_MEDIA_HTTP_CODE, 'Invalid request.' unless valid_request? params
begin
@image = MiniMagick::Image.read(params['media'][:tempfile].read)
rescue MiniMagick::Invalid
halt UNSUPPORTED_MEDIA_HTTP_CODE, 'Wrong image.'
end
get_fullpath
make_upload_folder
save
{ url: "#{settings.app_url}/#{@image_name}" }.to_json
end
run! if __FILE__ == $PROGRAM_NAME
end