Class: PhotoCook::Resize::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/photo-cook/resize/middleware.rb

Class Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/photo-cook/resize/middleware.rb', line 13

def initialize(app)
  @app = app
end

Class Attribute Details

.headers ⇒ Object

Returns the value of attribute headers.



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# File 'lib/photo-cook/resize/middleware.rb', line 8

def headers
  @headers
end

Instance Method Details

#call(env) ⇒ Object

Consider we have car.png in /uploads/photos/1/car.png We want to resize it with the following params:

Width:       choose automatically
Height:      exactly 640px
Mode:        fill

Middleware will handle this URI:

/uploads/photos/1/resized/width=auto&height=640&mode=fill/car.png



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# File 'lib/photo-cook/resize/middleware.rb', line 26

def call(env)
  uri = extract_uri(env)

  # Check if URI contains PhotoCook resize indicators
  return default_action(env) unless Assemble.resize_uri?(uri)

  # If resized photo exists but nginx or apache didn't handle this request
  return respond_with_file(env) if requested_file_exists?(uri)

  # At this point we are sure that this request is targeting to resize photo
  PhotoCook.notify('resize:middleware:match', uri)

  # Matched data: width=auto&height=640&mode=fill
  command = Command.extract(uri)

  # Assemble path of the source photo:
  #   => /application/public/uploads/photos/1/car.png
  source_path = Assemble.assemble_source_path_from_resize_uri(root_path, uri)

  # Assemble path of the resized photo:
  #   => /application/public/resized/uploads/photos/1/COMMAND/car.png
  store_path = Assemble.assemble_store_path(root_path, source_path, command.to_s)

  if File.file?(store_path) && File.readable?(store_path)
    symlink_cache_dir(source_path, store_path)
    respond_with_file(env)

  elsif File.file?(source_path) && File.readable?(source_path)
    # Finally resize photo
    # Resized photo will appear in resize directory
    Resize.perform(source_path, store_path, command[:width], command[:height], command[:mode])
    symlink_cache_dir(source_path, store_path)
    respond_with_file(env)

  else
    default_action(env)
  end
end