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154 lines
4.7 KiB
Lua
154 lines
4.7 KiB
Lua
--[[
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HTTP protocol implementation for LuCI - RFC2616 / 14.19, 14.24 - 14.28
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(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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$Id: conditionals.lua 5637 2009-12-20 18:35:05Z jow $
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]]--
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--- LuCI http protocol implementation - HTTP/1.1 bits.
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-- This class provides basic ETag handling and implements most of the
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-- conditional HTTP/1.1 headers specified in RFC2616 Sct. 14.24 - 14.28 .
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module("luci.http.protocol.conditionals", package.seeall)
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local date = require("luci.http.protocol.date")
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--- Implement 14.19 / ETag.
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-- @param stat A file.stat structure
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-- @return String containing the generated tag suitable for ETag headers
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function mk_etag( stat )
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if stat ~= nil then
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return string.format( '"%x-%x-%x"', stat.ino, stat.size, stat.mtime )
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end
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end
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--- 14.24 / If-Match
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-- Test whether the given message object contains an "If-Match" header and
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-- compare it against the given stat object.
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-- @param req HTTP request message object
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-- @param stat A file.stat object
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-- @return Boolean indicating whether the precondition is ok
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-- @return Alternative status code if the precondition failed
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function if_match( req, stat )
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local h = req.headers
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local etag = mk_etag( stat )
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-- Check for matching resource
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if type(h['If-Match']) == "string" then
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for ent in h['If-Match']:gmatch("([^, ]+)") do
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if ( ent == '*' or ent == etag ) and stat ~= nil then
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return true
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end
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end
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return false, 412
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end
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return true
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end
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--- 14.25 / If-Modified-Since
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-- Test whether the given message object contains an "If-Modified-Since" header
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-- and compare it against the given stat object.
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-- @param req HTTP request message object
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-- @param stat A file.stat object
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-- @return Boolean indicating whether the precondition is ok
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-- @return Alternative status code if the precondition failed
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-- @return Table containing extra HTTP headers if the precondition failed
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function if_modified_since( req, stat )
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local h = req.headers
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-- Compare mtimes
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if type(h['If-Modified-Since']) == "string" then
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local since = date.to_unix( h['If-Modified-Since'] )
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if stat == nil or since < stat.mtime then
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return true
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end
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return false, 304, {
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["ETag"] = mk_etag( stat );
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["Date"] = date.to_http( os.time() );
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["Last-Modified"] = date.to_http( stat.mtime )
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}
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end
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return true
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end
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--- 14.26 / If-None-Match
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-- Test whether the given message object contains an "If-None-Match" header and
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-- compare it against the given stat object.
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-- @param req HTTP request message object
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-- @param stat A file.stat object
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-- @return Boolean indicating whether the precondition is ok
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-- @return Alternative status code if the precondition failed
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-- @return Table containing extra HTTP headers if the precondition failed
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function if_none_match( req, stat )
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local h = req.headers
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local etag = mk_etag( stat )
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local method = req.env and req.env.REQUEST_METHOD or "GET"
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-- Check for matching resource
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if type(h['If-None-Match']) == "string" then
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for ent in h['If-None-Match']:gmatch("([^, ]+)") do
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if ( ent == '*' or ent == etag ) and stat ~= nil then
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if method == "GET" or method == "HEAD" then
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return false, 304, {
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["ETag"] = etag;
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["Date"] = date.to_http( os.time() );
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["Last-Modified"] = date.to_http( stat.mtime )
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}
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else
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return false, 412
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end
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end
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end
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end
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return true
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end
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--- 14.27 / If-Range
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-- The If-Range header is currently not implemented due to the lack of general
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-- byte range stuff in luci.http.protocol . This function will always return
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-- false, 412 to indicate a failed precondition.
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-- @param req HTTP request message object
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-- @param stat A file.stat object
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-- @return Boolean indicating whether the precondition is ok
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-- @return Alternative status code if the precondition failed
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function if_range( req, stat )
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-- Sorry, no subranges (yet)
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return false, 412
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end
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--- 14.28 / If-Unmodified-Since
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-- Test whether the given message object contains an "If-Unmodified-Since"
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-- header and compare it against the given stat object.
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-- @param req HTTP request message object
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-- @param stat A file.stat object
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-- @return Boolean indicating whether the precondition is ok
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-- @return Alternative status code if the precondition failed
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function if_unmodified_since( req, stat )
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local h = req.headers
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-- Compare mtimes
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if type(h['If-Unmodified-Since']) == "string" then
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local since = date.to_unix( h['If-Unmodified-Since'] )
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if stat ~= nil and since <= stat.mtime then
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return false, 412
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end
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end
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return true
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end
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