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.
# File lib/rack/file.rb, line 34 def _call(env) @path_info = Utils.unescape(env["PATH_INFO"]) parts = @path_info.split SEPS return fail(403, "Forbidden") if parts.include? ".." @path = F.join(@root, *parts) 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
# File lib/rack/file.rb, line 95 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
# File lib/rack/file.rb, line 55 def serving(env) # NOTE: # We check via File::size? whether this file provides size info # via stat (e.g. /proc files often don't), otherwise we have to # figure it out by reading the whole file into memory. size = F.size?(@path) || Utils.bytesize(F.read(@path)) response = [ 200, { "Last-Modified" => F.mtime(@path).httpdate, "Content-Type" => Mime.mime_type(F.extname(@path), 'text/plain') }, self ] response[1].merge! 'Cache-Control' => @cache_control if @cache_control 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[1]["Content-Length"] = size.to_s response end
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