145 lines
4.9 KiB
Crystal
145 lines
4.9 KiB
Crystal
{% if !flag?(:without_zlib) %}
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require "zlib"
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{% end %}
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module Kemal
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class StaticFileHandler < HTTP::StaticFileHandler
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def call(context)
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return call_next(context) if context.request.path.not_nil! == "/"
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unless context.request.method == "GET" || context.request.method == "HEAD"
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if @fallthrough
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call_next(context)
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else
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context.response.status_code = 405
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context.response.headers.add("Allow", "GET, HEAD")
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end
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return
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end
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config = Kemal.config.serve_static
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original_path = context.request.path.not_nil!
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is_dir_path = original_path.ends_with? "/"
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request_path = URI.unescape(original_path)
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# File path cannot contains '\0' (NUL) because all filesystem I know
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# don't accept '\0' character as file name.
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if request_path.includes? '\0'
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context.response.status_code = 400
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return
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end
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expanded_path = File.expand_path(request_path, "/")
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if is_dir_path && !expanded_path.ends_with? "/"
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expanded_path = "#{expanded_path}/"
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end
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is_dir_path = expanded_path.ends_with? "/"
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file_path = File.join(@public_dir, expanded_path)
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is_dir = Dir.exists? file_path
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if request_path != expanded_path || is_dir && !is_dir_path
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redirect_to context, "#{expanded_path}#{is_dir && !is_dir_path ? "/" : ""}"
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end
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if Dir.exists?(file_path)
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if config.is_a?(Hash) && config["dir_listing"] == true
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context.response.content_type = "text/html"
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directory_listing(context.response, request_path, file_path)
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else
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return call_next(context)
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end
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elsif File.exists?(file_path)
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return if self.etag(context, file_path)
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minsize = 860 # http://webmasters.stackexchange.com/questions/31750/what-is-recommended-minimum-object-size-for-gzip-performance-benefits ??
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context.response.content_type = Utils.mime_type(file_path)
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request_headers = context.request.headers
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filesize = File.size(file_path)
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File.open(file_path) do |file|
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if context.request.method == "GET" && context.request.headers.has_key?("Range")
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next multipart(file, context)
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end
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if request_headers.includes_word?("Accept-Encoding", "gzip") && config.is_a?(Hash) && config["gzip"] == true && filesize > minsize && Utils.zip_types(file_path)
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context.response.headers["Content-Encoding"] = "gzip"
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Gzip::Writer.open(context.response) do |deflate|
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IO.copy(file, deflate)
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end
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elsif request_headers.includes_word?("Accept-Encoding", "deflate") && config.is_a?(Hash) && config["gzip"]? == true && filesize > minsize && Utils.zip_types(file_path)
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context.response.headers["Content-Encoding"] = "deflate"
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Flate::Writer.new(context.response) do |deflate|
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IO.copy(file, deflate)
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end
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else
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context.response.content_length = filesize
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IO.copy(file, context.response)
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end
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end
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else
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call_next(context)
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end
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end
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def etag(context, file_path)
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etag = %{W/"#{File.lstat(file_path).mtime.epoch.to_s}"}
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context.response.headers["ETag"] = etag
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return false if !context.request.headers["If-None-Match"]? || context.request.headers["If-None-Match"] != etag
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context.response.headers.delete "Content-Type"
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context.response.content_length = 0
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context.response.status_code = 304 # not modified
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return true
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end
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private def multipart(file, env)
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# See http://httpwg.org/specs/rfc7233.html
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fileb = file.size
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range = env.request.headers["Range"]
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match = range.match(/bytes=(\d{1,})-(\d{0,})/)
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startb = 0
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endb = 0
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if match
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if match.size >= 2
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startb = match[1].to_i { 0 }
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end
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if match.size >= 3
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endb = match[2].to_i { 0 }
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end
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end
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if endb == 0
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endb = fileb
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end
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if startb < endb && endb <= fileb
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env.response.status_code = 206
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env.response.content_length = endb - startb
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env.response.headers["Accept-Ranges"] = "bytes"
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env.response.headers["Content-Range"] = "bytes #{startb}-#{endb - 1}/#{fileb}" # MUST
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if startb > 1024
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skipped = 0
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# file.skip only accepts values less or equal to 1024 (buffer size, undocumented)
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until skipped + 1024 > startb
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file.skip(1024)
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skipped += 1024
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end
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if skipped - startb > 0
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file.skip(skipped - startb)
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end
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else
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file.skip(startb)
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end
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IO.copy(file, env.response, endb - startb)
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else
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env.response.content_length = fileb
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env.response.status_code = 200 # Range not satisfable, see 4.4 Note
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IO.copy(file, env.response)
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end
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end
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end
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end
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