128 lines
4.2 KiB
Ruby
128 lines
4.2 KiB
Ruby
require "rack/utils"
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require "active_support/core_ext/uri"
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module ActionDispatch
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# This middleware returns a file's contents from disk in the body response.
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# When initialized, it can accept optional HTTP headers, which will be set
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# when a response containing a file's contents is delivered.
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#
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# This middleware will render the file specified in `env["PATH_INFO"]`
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# where the base path is in the +root+ directory. For example, if the +root+
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# is set to `public/`, then a request with `env["PATH_INFO"]` of
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# `assets/application.js` will return a response with the contents of a file
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# located at `public/assets/application.js` if the file exists. If the file
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# does not exist, a 404 "File not Found" response will be returned.
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class FileHandler
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def initialize(root, index: "index", headers: {})
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@root = root.chomp("/")
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@file_server = ::Rack::File.new(@root, headers)
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@index = index
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end
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# Takes a path to a file. If the file is found, has valid encoding, and has
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# correct read permissions, the return value is a URI-escaped string
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# representing the filename. Otherwise, false is returned.
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#
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# Used by the `Static` class to check the existence of a valid file
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# in the server's `public/` directory (see Static#call).
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def match?(path)
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path = ::Rack::Utils.unescape_path path
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return false unless ::Rack::Utils.valid_path? path
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path = ::Rack::Utils.clean_path_info path
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paths = [path, "#{path}#{ext}", "#{path}/#{@index}#{ext}"]
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if match = paths.detect { |p|
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path = File.join(@root, p.force_encoding(Encoding::UTF_8))
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begin
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File.file?(path) && File.readable?(path)
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rescue SystemCallError
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false
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end
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}
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return ::Rack::Utils.escape_path(match)
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end
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end
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def call(env)
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serve(Rack::Request.new(env))
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end
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def serve(request)
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path = request.path_info
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gzip_path = gzip_file_path(path)
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if gzip_path && gzip_encoding_accepted?(request)
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request.path_info = gzip_path
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status, headers, body = @file_server.call(request.env)
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if status == 304
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return [status, headers, body]
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end
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headers["Content-Encoding"] = "gzip"
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headers["Content-Type"] = content_type(path)
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else
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status, headers, body = @file_server.call(request.env)
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end
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headers["Vary"] = "Accept-Encoding" if gzip_path
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return [status, headers, body]
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ensure
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request.path_info = path
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end
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private
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def ext
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::ActionController::Base.default_static_extension
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end
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def content_type(path)
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::Rack::Mime.mime_type(::File.extname(path), "text/plain".freeze)
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end
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def gzip_encoding_accepted?(request)
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request.accept_encoding.any? { |enc, quality| enc =~ /\bgzip\b/i }
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end
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def gzip_file_path(path)
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can_gzip_mime = content_type(path) =~ /\A(?:text\/|application\/javascript)/
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gzip_path = "#{path}.gz"
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if can_gzip_mime && File.exist?(File.join(@root, ::Rack::Utils.unescape_path(gzip_path)))
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gzip_path
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else
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false
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end
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end
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end
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# This middleware will attempt to return the contents of a file's body from
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# disk in the response. If a file is not found on disk, the request will be
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# delegated to the application stack. This middleware is commonly initialized
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# to serve assets from a server's `public/` directory.
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#
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# This middleware verifies the path to ensure that only files
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# living in the root directory can be rendered. A request cannot
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# produce a directory traversal using this middleware. Only 'GET' and 'HEAD'
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# requests will result in a file being returned.
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class Static
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def initialize(app, path, index: "index", headers: {})
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@app = app
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@file_handler = FileHandler.new(path, index: index, headers: headers)
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end
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def call(env)
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req = Rack::Request.new env
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if req.get? || req.head?
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path = req.path_info.chomp("/".freeze)
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if match = @file_handler.match?(path)
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req.path_info = match
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return @file_handler.serve(req)
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end
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end
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@app.call(req.env)
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end
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end
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end
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