mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
135 lines
4.6 KiB
Ruby
135 lines
4.6 KiB
Ruby
require 'rack/utils'
|
|
require 'active_support/core_ext/uri'
|
|
|
|
module ActionDispatch
|
|
# This middleware returns a file's contents from disk in the body response.
|
|
# When initialized, it can accept optional HTTP headers, which will be set
|
|
# when a response containing a file's contents is delivered.
|
|
#
|
|
# This middleware will render the file specified in `env["PATH_INFO"]`
|
|
# where the base path is in the +root+ directory. For example, if the +root+
|
|
# is set to `public/`, then a request with `env["PATH_INFO"]` of
|
|
# `assets/application.js` will return a response with the contents of a file
|
|
# located at `public/assets/application.js` if the file exists. If the file
|
|
# does not exist, a 404 "File not Found" response will be returned.
|
|
class FileHandler
|
|
def initialize(root, index: 'index', headers: {})
|
|
@root = root.chomp('/')
|
|
@file_server = ::Rack::File.new(@root, headers)
|
|
@index = index
|
|
end
|
|
|
|
# Takes a path to a file. If the file is found, has valid encoding, and has
|
|
# correct read permissions, the return value is a URI-escaped string
|
|
# representing the filename. Otherwise, false is returned.
|
|
#
|
|
# Used by the `Static` class to check the existence of a valid file
|
|
# in the server's `public/` directory (see Static#call).
|
|
def match?(path)
|
|
path = ::Rack::Utils.unescape_path path
|
|
return false unless path.valid_encoding?
|
|
path = Rack::Utils.clean_path_info path
|
|
|
|
paths = [path, "#{path}#{ext}", "#{path}/#{@index}#{ext}"]
|
|
|
|
if match = paths.detect { |p|
|
|
path = File.join(@root, p.force_encoding('UTF-8'.freeze))
|
|
begin
|
|
File.file?(path) && File.readable?(path)
|
|
rescue SystemCallError
|
|
false
|
|
end
|
|
|
|
}
|
|
return ::Rack::Utils.escape_path(match)
|
|
end
|
|
end
|
|
|
|
def call(env)
|
|
serve ActionDispatch::Request.new env
|
|
end
|
|
|
|
def serve(request)
|
|
path = request.path_info
|
|
gzip_path = gzip_file_path(path)
|
|
|
|
if gzip_path && gzip_encoding_accepted?(request)
|
|
request.path_info = gzip_path
|
|
status, headers, body = @file_server.call(request.env)
|
|
if status == 304
|
|
return [status, headers, body]
|
|
end
|
|
headers['Content-Encoding'] = 'gzip'
|
|
headers['Content-Type'] = content_type(path)
|
|
else
|
|
status, headers, body = @file_server.call(request.env)
|
|
end
|
|
|
|
headers['Vary'] = 'Accept-Encoding' if gzip_path
|
|
|
|
return [status, headers, body]
|
|
ensure
|
|
request.path_info = path
|
|
end
|
|
|
|
private
|
|
def ext
|
|
::ActionController::Base.default_static_extension
|
|
end
|
|
|
|
def content_type(path)
|
|
::Rack::Mime.mime_type(::File.extname(path), 'text/plain'.freeze)
|
|
end
|
|
|
|
def gzip_encoding_accepted?(request)
|
|
request.accept_encoding =~ /\bgzip\b/i
|
|
end
|
|
|
|
def gzip_file_path(path)
|
|
can_gzip_mime = content_type(path) =~ /\A(?:text\/|application\/javascript)/
|
|
gzip_path = "#{path}.gz"
|
|
if can_gzip_mime && File.exist?(File.join(@root, ::Rack::Utils.unescape_path(gzip_path)))
|
|
gzip_path
|
|
else
|
|
false
|
|
end
|
|
end
|
|
end
|
|
|
|
# This middleware will attempt to return the contents of a file's body from
|
|
# disk in the response. If a file is not found on disk, the request will be
|
|
# delegated to the application stack. This middleware is commonly initialized
|
|
# to serve assets from a server's `public/` directory.
|
|
#
|
|
# This middleware verifies the path to ensure that only files
|
|
# living in the root directory can be rendered. A request cannot
|
|
# produce a directory traversal using this middleware. Only 'GET' and 'HEAD'
|
|
# requests will result in a file being returned.
|
|
class Static
|
|
def initialize(app, path, deprecated_cache_control = :not_set, index: 'index', headers: {})
|
|
if deprecated_cache_control != :not_set
|
|
ActiveSupport::Deprecation.warn("The `cache_control` argument is deprecated," \
|
|
"replaced by `headers: { 'Cache-Control' => #{deprecated_cache_control} }`, " \
|
|
" and will be removed in Rails 5.1.")
|
|
headers['Cache-Control'.freeze] = deprecated_cache_control
|
|
end
|
|
|
|
@app = app
|
|
@file_handler = FileHandler.new(path, index: index, headers: headers)
|
|
end
|
|
|
|
def call(env)
|
|
req = ActionDispatch::Request.new env
|
|
|
|
if req.get? || req.head?
|
|
path = req.path_info.chomp('/'.freeze)
|
|
if match = @file_handler.match?(path)
|
|
req.path_info = match
|
|
return @file_handler.serve(req)
|
|
end
|
|
end
|
|
|
|
@app.call(req.env)
|
|
end
|
|
end
|
|
end
|