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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CacheControlParser.h"
namespace mozilla {
namespace net {
CacheControlParser::CacheControlParser(nsACString const &aHeader)
: Tokenizer(aHeader, nullptr, "-_")
, mMaxAgeSet(false)
, mMaxAge(0)
, mMaxStaleSet(false)
, mMaxStale(0)
, mMinFreshSet(false)
, mMinFresh(0)
, mNoCache(false)
, mNoStore(false)
{
SkipWhites();
if (!CheckEOF()) {
Directive();
}
}
void CacheControlParser::Directive()
{
if (CheckWord("no-cache")) {
mNoCache = true;
IgnoreDirective(); // ignore any optionally added values
} else if (CheckWord("no-store")) {
mNoStore = true;
} else if (CheckWord("max-age")) {
mMaxAgeSet = SecondsValue(&mMaxAge);
} else if (CheckWord("max-stale")) {
mMaxStaleSet = SecondsValue(&mMaxStale, PR_UINT32_MAX);
} else if (CheckWord("min-fresh")) {
mMinFreshSet = SecondsValue(&mMinFresh);
} else {
IgnoreDirective();
}
SkipWhites();
if (CheckEOF()) {
return;
}
if (CheckChar(',')) {
SkipWhites();
Directive();
return;
}
NS_WARNING("Unexpected input in Cache-control header value");
}
bool CacheControlParser::SecondsValue(uint32_t *seconds, uint32_t defaultVal)
{
SkipWhites();
if (!CheckChar('=')) {
*seconds = defaultVal;
return !!defaultVal;
}
SkipWhites();
if (!ReadInteger(seconds)) {
NS_WARNING("Unexpected value in Cache-control header value");
return false;
}
return true;
}
void CacheControlParser::IgnoreDirective()
{
Token t;
while (Next(t)) {
if (t.Equals(Token::Char(',')) || t.Equals(Token::EndOfFile())) {
Rollback();
break;
}
if (t.Equals(Token::Char('"'))) {
SkipUntil(Token::Char('"'));
if (!CheckChar('"')) {
NS_WARNING("Missing quoted string expansion in Cache-control header value");
break;
}
}
}
}
bool CacheControlParser::MaxAge(uint32_t *seconds)
{
*seconds = mMaxAge;
return mMaxAgeSet;
}
bool CacheControlParser::MaxStale(uint32_t *seconds)
{
*seconds = mMaxStale;
return mMaxStaleSet;
}
bool CacheControlParser::MinFresh(uint32_t *seconds)
{
*seconds = mMinFresh;
return mMinFreshSet;
}
bool CacheControlParser::NoCache()
{
return mNoCache;
}
bool CacheControlParser::NoStore()
{
return mNoStore;
}
} // net
} // mozilla
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