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require "uri"
require "../handler"
require "../mime-type"
require "../views/html/page"
class Guff::Handlers::GuffStuffHandler < Guff::Handler
def initialize(models)
super(models)
@digests = {} of String => String
end
def call(context : HTTP::Server::Context)
path = context.request.path.not_nil!
if matching_request?(context.request.method, path)
reply(context)
else
call_next(context)
end
end
private def reply(context : HTTP::Server::Context)
# get expanded path to file
if path = expand_path(context.request.path.not_nil!)
# get file digest
file_digest = digest(path)
# check for cache header
if context.request.headers["if-none-match"]? == file_digest
# cached, send 304 not modified
context.response.status_code = 304
else
# not cached, set code and send headers
context.response.status_code = 200
context.response.content_type = Guff::MimeType.mime_type(path)
context.response.content_length = File.size(path)
context.response.headers["etag"] = file_digest
if context.request.method == "GET"
# send body
File.open(path) do |fh|
IO.copy(fh, context.response)
end
end
end
else
# file not found
context.response.status_code = 404
end
end
VALID_METHODS = %w{GET HEAD}
PATH_RE = %r{^/guff-stuff/}
private def matching_request?(method, path)
VALID_METHODS.includes?(method) && PATH_RE.match(path)
end
private def expand_path(req_path : String) : String?
# unescape path, check for nil byte
path = URI.unescape(req_path)
return nil if path.includes?('\0')
# build absolute path
r = File.join(
@models.config["stuff"],
File.expand_path(path.gsub(PATH_RE, ""), "/")
)
# return path if file exists, or nil otherwise
File.file?(r) ? r : nil
end
private def digest(path : String) : String
@digests[path] ||= OpenSSL::Digest.new("SHA1").file(path).hexdigest
end
end
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