Class: Rack::File

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/file.rb

Overview

Rack::File serves files below the root directory given, according to the path info of the Rack request. e.g. when Rack::File.new(“/etc”) is used, you can access ‘passwd’ file as localhost:9292/passwd

Handlers can detect if bodies are a Rack::File, and use mechanisms like sendfile on the path.

Constant Summary collapse

ALLOWED_VERBS = 
%w[GET HEAD OPTIONS]
ALLOW_HEADER = 
ALLOWED_VERBS.join(', ')
F = 
::File

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root, headers = {}, default_mime = 'text/plain') ⇒ File

Returns a new instance of File.



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# File 'lib/rack/file.rb', line 24

def initialize(root, headers={}, default_mime = 'text/plain')
  @root = root
  @headers = headers
  @default_mime = default_mime
end

Instance Attribute Details

#cache_control ⇒ Object

Returns the value of attribute cache_control.



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# File 'lib/rack/file.rb', line 20

def cache_control
  @cache_control
end

#path ⇒ Object Also known as: to_path

Returns the value of attribute path.



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# File 'lib/rack/file.rb', line 19

def path
  @path
end

#root ⇒ Object

Returns the value of attribute root.



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# File 'lib/rack/file.rb', line 18

def root
  @root
end

Instance Method Details

#_call(env) ⇒ Object 



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# File 'lib/rack/file.rb', line 36

def _call(env)
  unless ALLOWED_VERBS.include? env[REQUEST_METHOD]
    return fail(405, "Method Not Allowed", {'Allow' => ALLOW_HEADER})
  end

  path_info = Utils.unescape(env[PATH_INFO])
  clean_path_info = Utils.clean_path_info(path_info)

  @path = F.join(@root, clean_path_info)

  available = begin
    F.file?(@path) && F.readable?(@path)
  rescue SystemCallError
    false
  end

  if available
    serving(env)
  else
    fail(404, "File not found: #{path_info}")
  end
end

#call(env) ⇒ Object 



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# File 'lib/rack/file.rb', line 30

def call(env)
  dup._call(env)
end

#each ⇒ Object 



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# File 'lib/rack/file.rb', line 101

def each
  F.open(@path, "rb") do |file|
    file.seek(@range.begin)
    remaining_len = @range.end-@range.begin+1
    while remaining_len > 0
      part = file.read([8192, remaining_len].min)
      break unless part
      remaining_len -= part.length

      yield part
    end
  end
end

#serving(env) ⇒ Object 



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# File 'lib/rack/file.rb', line 59

def serving(env)
  if env["REQUEST_METHOD"] == "OPTIONS"
    return [200, {'Allow' => ALLOW_HEADER, CONTENT_LENGTH => '0'}, []]
  end
  last_modified = F.mtime(@path).httpdate
  return [304, {}, []] if env['HTTP_IF_MODIFIED_SINCE'] == last_modified

  headers = { "Last-Modified" => last_modified }
  headers[CONTENT_TYPE] = mime_type if mime_type

  # Set custom headers
  @headers.each { |field, content| headers[field] = content } if @headers

  response = [ 200, headers, env[REQUEST_METHOD] == "HEAD" ? [] : self ]

  size = filesize

  ranges = Rack::Utils.byte_ranges(env, size)
  if ranges.nil? || ranges.length > 1
    # No ranges, or multiple ranges (which we don't support):
    # TODO: Support multiple byte-ranges
    response[0] = 200
    @range = 0..size-1
  elsif ranges.empty?
    # Unsatisfiable. Return error, and file size:
    response = fail(416, "Byte range unsatisfiable")
    response[1]["Content-Range"] = "bytes */#{size}"
    return response
  else
    # Partial content:
    @range = ranges[0]
    response[0] = 206
    response[1]["Content-Range"] = "bytes #{@range.begin}-#{@range.end}/#{size}"
    size = @range.end - @range.begin + 1
  end

  response[2] = [response_body] unless response_body.nil?

  response[1][CONTENT_LENGTH] = size.to_s
  response
end