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- -- Copyright 2008 Freifunk Leipzig / Jo-Philipp Wich <jow@openwrt.org>
- -- Licensed to the public under the Apache License 2.0.
- -- This class provides basic ETag handling and implements most of the
- -- conditional HTTP/1.1 headers specified in RFC2616 Sct. 14.24 - 14.28 .
- module("luci.http.conditionals", package.seeall)
- local date = require("luci.http.date")
- function mk_etag( stat )
- if stat ~= nil then
- return string.format( '"%x-%x-%x"', stat.ino, stat.size, stat.mtime )
- end
- end
- -- Test whether the given message object contains an "If-Match" header and
- -- compare it against the given stat object.
- function if_match( req, stat )
- local h = req.headers
- local etag = mk_etag( stat )
- -- Check for matching resource
- if type(h['If-Match']) == "string" then
- for ent in h['If-Match']:gmatch("([^, ]+)") do
- if ( ent == '*' or ent == etag ) and stat ~= nil then
- return true
- end
- end
- return false, 412
- end
- return true
- end
- -- Test whether the given message object contains an "If-Modified-Since" header
- -- and compare it against the given stat object.
- function if_modified_since( req, stat )
- local h = req.headers
- -- Compare mtimes
- if type(h['If-Modified-Since']) == "string" then
- local since = date.to_unix( h['If-Modified-Since'] )
- if stat == nil or since < stat.mtime then
- return true
- end
- return false, 304, {
- ["ETag"] = mk_etag( stat );
- ["Date"] = date.to_http( os.time() );
- ["Last-Modified"] = date.to_http( stat.mtime )
- }
- end
- return true
- end
- -- Test whether the given message object contains an "If-None-Match" header and
- -- compare it against the given stat object.
- function if_none_match( req, stat )
- local h = req.headers
- local etag = mk_etag( stat )
- local method = req.env and req.env.REQUEST_METHOD or "GET"
- -- Check for matching resource
- if type(h['If-None-Match']) == "string" then
- for ent in h['If-None-Match']:gmatch("([^, ]+)") do
- if ( ent == '*' or ent == etag ) and stat ~= nil then
- if method == "GET" or method == "HEAD" then
- return false, 304, {
- ["ETag"] = etag;
- ["Date"] = date.to_http( os.time() );
- ["Last-Modified"] = date.to_http( stat.mtime )
- }
- else
- return false, 412
- end
- end
- end
- end
- return true
- end
- -- The If-Range header is currently not implemented due to the lack of general
- -- byte range stuff in luci.http.protocol . This function will always return
- -- false, 412 to indicate a failed precondition.
- function if_range( req, stat )
- -- Sorry, no subranges (yet)
- return false, 412
- end
- -- Test whether the given message object contains an "If-Unmodified-Since"
- -- header and compare it against the given stat object.
- function if_unmodified_since( req, stat )
- local h = req.headers
- -- Compare mtimes
- if type(h['If-Unmodified-Since']) == "string" then
- local since = date.to_unix( h['If-Unmodified-Since'] )
- if stat ~= nil and since <= stat.mtime then
- return false, 412
- end
- end
- return true
- end
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