src: Don't push if Link header field includes nopush
This commit is contained in:
Tatsuhiro Tsujikawa
parent
5da38b22c0
commit
9afc017532
199
src/http2.cc
199
src/http2.cc
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@ -864,6 +864,29 @@ bool check_link_param_empty(const char *first, const char *last,
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}
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} // namespace
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namespace {
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// Returns true if link-param consists of only parmname, and it
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// matches string [pat, pat + patlen).
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bool check_link_param_without_value(const char *first, const char *last,
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const char *pat, size_t patlen) {
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if (first + patlen > last) {
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return false;
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}
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if (first + patlen == last) {
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return std::equal(pat, pat + patlen, first, util::CaseCmp());
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}
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switch (*(first + patlen)) {
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case ';':
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case ',':
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return std::equal(pat, pat + patlen, first, util::CaseCmp());
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}
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return false;
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}
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} // namespace
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namespace {
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std::pair<LinkHeader, const char *>
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parse_next_link_header_once(const char *first, const char *last) {
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@ -900,99 +923,109 @@ parse_next_link_header_once(const char *first, const char *last) {
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}
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// we expect link-param
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// rel can take several relations using quoted form.
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static constexpr char PLP[] = "rel=\"";
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static constexpr size_t PLPLEN = sizeof(PLP) - 1;
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if (!ign) {
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// rel can take several relations using quoted form.
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static constexpr char PLP[] = "rel=\"";
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static constexpr size_t PLPLEN = sizeof(PLP) - 1;
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static constexpr char PLT[] = "preload";
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static constexpr size_t PLTLEN = sizeof(PLT) - 1;
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if (first + PLPLEN < last && *(first + PLPLEN - 1) == '"' &&
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std::equal(PLP, PLP + PLPLEN, first, util::CaseCmp())) {
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// we have to search preload in whitespace separated list:
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// rel="preload something http://example.org/foo"
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first += PLPLEN;
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auto start = first;
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for (; first != last;) {
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if (*first != ' ' && *first != '"') {
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static constexpr char PLT[] = "preload";
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static constexpr size_t PLTLEN = sizeof(PLT) - 1;
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if (first + PLPLEN < last && *(first + PLPLEN - 1) == '"' &&
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std::equal(PLP, PLP + PLPLEN, first, util::CaseCmp())) {
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// we have to search preload in whitespace separated list:
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// rel="preload something http://example.org/foo"
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first += PLPLEN;
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auto start = first;
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for (; first != last;) {
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if (*first != ' ' && *first != '"') {
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++first;
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continue;
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}
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if (start == first) {
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return {{{nullptr, nullptr}}, last};
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}
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if (!ok && start + PLTLEN == first &&
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std::equal(PLT, PLT + PLTLEN, start, util::CaseCmp())) {
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ok = true;
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}
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if (*first == '"') {
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break;
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}
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first = skip_lws(first, last);
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start = first;
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}
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if (first == last) {
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return {{{nullptr, nullptr}}, first};
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}
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assert(*first == '"');
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++first;
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if (first == last || *first == ',') {
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goto almost_done;
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}
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if (*first == ';') {
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++first;
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// parse next link-param
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continue;
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}
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if (start == first) {
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return {{{nullptr, nullptr}}, last};
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return {{{nullptr, nullptr}}, last};
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}
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// we are only interested in rel=preload parameter. Others are
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// simply skipped.
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static constexpr char PL[] = "rel=preload";
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static constexpr size_t PLLEN = sizeof(PL) - 1;
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if (first + PLLEN == last) {
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if (std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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// ok = true;
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// this is the end of sequence
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return {{{url_first, url_last}}, last};
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}
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if (!ok && start + PLTLEN == first &&
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std::equal(PLT, PLT + PLTLEN, start, util::CaseCmp())) {
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} else if (first + PLLEN + 1 <= last) {
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switch (*(first + PLLEN)) {
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case ',':
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if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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break;
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}
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// ok = true;
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// skip including ','
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first += PLLEN + 1;
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return {{{url_first, url_last}}, first};
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case ';':
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if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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break;
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}
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ok = true;
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// skip including ';'
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first += PLLEN + 1;
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// continue parse next link-param
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continue;
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}
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}
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// we have to reject URI if we have nonempty anchor parameter.
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static constexpr char ANCHOR[] = "anchor=";
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static constexpr size_t ANCHORLEN = sizeof(ANCHOR) - 1;
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if (!ign && !check_link_param_empty(first, last, ANCHOR, ANCHORLEN)) {
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ign = true;
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}
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if (*first == '"') {
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break;
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}
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first = skip_lws(first, last);
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start = first;
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// reject URI if we have non-empty loadpolicy. This could be
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// tightened up to just pick up "next" or "insert".
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static constexpr char LOADPOLICY[] = "loadpolicy=";
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static constexpr size_t LOADPOLICYLEN = sizeof(LOADPOLICY) - 1;
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if (!ign &&
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!check_link_param_empty(first, last, LOADPOLICY, LOADPOLICYLEN)) {
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ign = true;
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}
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if (first == last) {
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return {{{nullptr, nullptr}}, first};
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}
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assert(*first == '"');
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++first;
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if (first == last || *first == ',') {
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goto almost_done;
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}
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if (*first == ';') {
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++first;
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// parse next link-param
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continue;
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}
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return {{{nullptr, nullptr}}, last};
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}
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// we are only interested in rel=preload parameter. Others are
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// simply skipped.
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static constexpr char PL[] = "rel=preload";
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static constexpr size_t PLLEN = sizeof(PL) - 1;
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if (first + PLLEN == last) {
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if (std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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// ok = true;
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// this is the end of sequence
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return {{{url_first, url_last}}, last};
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}
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} else if (first + PLLEN + 1 <= last) {
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switch (*(first + PLLEN)) {
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case ',':
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if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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break;
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}
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// ok = true;
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// skip including ','
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first += PLLEN + 1;
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return {{{url_first, url_last}}, first};
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case ';':
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if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
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break;
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}
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ok = true;
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// skip including ';'
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first += PLLEN + 1;
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// continue parse next link-param
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continue;
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}
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}
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// we have to reject URI if we have nonempty anchor parameter.
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static constexpr char ANCHOR[] = "anchor=";
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static constexpr size_t ANCHORLEN = sizeof(ANCHOR) - 1;
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if (!ign && !check_link_param_empty(first, last, ANCHOR, ANCHORLEN)) {
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ign = true;
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}
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// reject URI if we have non-empty loadpolicy. This could be
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// tightened up to just pick up "next" or "insert".
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static constexpr char LOADPOLICY[] = "loadpolicy=";
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static constexpr size_t LOADPOLICYLEN = sizeof(LOADPOLICY) - 1;
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if (!ign &&
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!check_link_param_empty(first, last, LOADPOLICY, LOADPOLICYLEN)) {
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ign = true;
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// reject URI if we have nopush attribute.
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static constexpr char NOPUSH[] = "nopush";
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static constexpr size_t NOPUSHLEN = str_size(NOPUSH);
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if (!ign &&
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check_link_param_without_value(first, last, NOPUSH, NOPUSHLEN)) {
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ign = true;
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}
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}
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auto param_first = first;
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@ -625,6 +625,38 @@ void test_http2_parse_link_header(void) {
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CU_ASSERT(std::make_pair(&s[36], &s[39]) == res[0].uri);
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CU_ASSERT(std::make_pair(&s[42 + 14], &s[42 + 17]) == res[1].uri);
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}
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{
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// nopush at the end of input
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constexpr char s[] = "<url>; rel=preload; nopush";
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auto res = http2::parse_link_header(s, str_size(s));
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CU_ASSERT(0 == res.size());
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}
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{
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// nopush followed by ';'
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constexpr char s[] = "<url>; rel=preload; nopush; foo";
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auto res = http2::parse_link_header(s, str_size(s));
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CU_ASSERT(0 == res.size());
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}
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{
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// nopush followed by ','
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constexpr char s[] = "<url>; nopush; rel=preload";
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auto res = http2::parse_link_header(s, str_size(s));
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CU_ASSERT(0 == res.size());
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}
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{
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// string whose prefix is nopush
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constexpr char s[] = "<url>; nopushyes; rel=preload";
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auto res = http2::parse_link_header(s, str_size(s));
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CU_ASSERT(1 == res.size());
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CU_ASSERT(std::make_pair(&s[1], &s[4]) == res[0].uri);
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}
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{
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// rel=preload twice
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constexpr char s[] = "<url>; rel=preload; rel=preload";
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auto res = http2::parse_link_header(s, str_size(s));
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CU_ASSERT(1 == res.size());
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CU_ASSERT(std::make_pair(&s[1], &s[4]) == res[0].uri);
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}
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}
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void test_http2_path_join(void) {
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