class Shrine::DerivationEndpoint

# File lib/shrine/plugins/derivation_endpoint.rb
355 def initialize(shrine_class:, options: {})
356   @shrine_class = shrine_class
357   @options      = options
358 end

# File lib/shrine/plugins/derivation_endpoint.rb
360 def call(env)
361   request = Rack::Request.new(env)
362 
363   status, headers, body = catch(:halt) do
364     error!(405, "Method not allowed") unless request.get? || request.head?
365 
366     handle_request(request)
367   end
368 
369   headers = Rack::Headers[headers] if Rack.release >= "3"
370   headers["Content-Length"] ||= body.respond_to?(:bytesize) ? body.bytesize.to_s :
371                                                               body.map(&:bytesize).inject(0, :+).to_s
372 
373   [status, headers, body]
374 end

# File lib/shrine/plugins/derivation_endpoint.rb
385 def handle_request(request)
386   verify_signature!(request) if secret_key
387   check_expiry!(request)
388 
389   name, *args, serialized_file = request.path_info.split("/")[1..-1]
390   serialized_file = serialized_file.sub(/\.\w+$/, "")
391 
392   name          = name.to_sym
393   uploaded_file = shrine_class::UploadedFile.urlsafe_load(serialized_file)
394 
395   # request params override statically configured options
396   options = self.options.dup
397   options[:type]        = request.params["type"]        if request.params["type"]
398   options[:disposition] = request.params["disposition"] if request.params["disposition"]
399   options[:filename]    = request.params["filename"]    if request.params["filename"]
400   options[:version]     = request.params["version"]     if request.params["version"]
401   options[:expires_in]  = expires_in(request)           if request.params["expires_at"]
402 
403   derivation = uploaded_file.derivation(name, *args, **options)
404 
405   begin
406     status, headers, body = derivation.response(request.env)
407   rescue Derivation::SourceNotFound
408     error!(404, "Source file not found")
409   rescue Derivation::NotFound
410     error!(404, "Unknown derivation \"#{name}\"")
411   end
412 
413   # tell clients to cache the derivation result if it was successful
414   if status == 200 || status == 206
415     headers["Cache-Control"] = derivation.option(:cache_control)
416   end
417 
418   [status, headers, body]
419 end

# File lib/shrine/plugins/derivation_endpoint.rb
421 def inspect
422   "#<#{@shrine_class}::DerivationEndpoint>"
423 end