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