Class: Useless::Rack::Base::Files

Inherits:
Object
  • Object
show all
Defined in:
lib/useless/rack/base/files.rb

Overview

Useless::Base::Files simply retrieves files from Useless::FS and serves them up.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.url_for(id) ⇒ Object

Provide a helper method for file URLs to keep things consistent.



10
11
12
 
# File 'lib/useless/rack/base/files.rb', line 10

def self.url_for(id)
  "http://useless.io/files/#{id}"
end

Instance Method Details

#call(env) ⇒ Object 



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/useless/rack/base/files.rb', line 14

def call(env)
  # The file ID is everything after the initial '/' in the path
  id = env['PATH_INFO'][1..-1]

  # Retrieve the file from FS
  file = env['useless.fs'].get(BSON::ObjectId(id))

  # and serve it up with the associated content type
  return [200, {'Content-Type' => file.content_type}, file.read]

# Two things can go wrong, and they'll both raise an error:
#   * the specified ID is not a valid object ID
#   * there is no file corresponding to the ID in the FS
rescue BSON::InvalidObjectId, Useless::FS::FileNotFound
  [404, {'Content-Type' => 'text/plain'}, "File not found: #{id}"]
end