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nghttp2/src/http2.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "http2.h"
#include "util.h"
namespace nghttp2 {
namespace http2 {
std::string get_status_string(unsigned int status_code) {
switch (status_code) {
case 100:
return "100 Continue";
case 101:
return "101 Switching Protocols";
case 200:
return "200 OK";
case 201:
return "201 Created";
case 202:
return "202 Accepted";
case 203:
return "203 Non-Authoritative Information";
case 204:
return "204 No Content";
case 205:
return "205 Reset Content";
case 206:
return "206 Partial Content";
case 300:
return "300 Multiple Choices";
case 301:
return "301 Moved Permanently";
case 302:
return "302 Found";
case 303:
return "303 See Other";
case 304:
return "304 Not Modified";
case 305:
return "305 Use Proxy";
// case 306: return "306 (Unused)";
case 307:
return "307 Temporary Redirect";
case 308:
return "308 Permanent Redirect";
case 400:
return "400 Bad Request";
case 401:
return "401 Unauthorized";
case 402:
return "402 Payment Required";
case 403:
return "403 Forbidden";
case 404:
return "404 Not Found";
case 405:
return "405 Method Not Allowed";
case 406:
return "406 Not Acceptable";
case 407:
return "407 Proxy Authentication Required";
case 408:
return "408 Request Timeout";
case 409:
return "409 Conflict";
case 410:
return "410 Gone";
case 411:
return "411 Length Required";
case 412:
return "412 Precondition Failed";
case 413:
return "413 Payload Too Large";
case 414:
return "414 URI Too Long";
case 415:
return "415 Unsupported Media Type";
case 416:
return "416 Requested Range Not Satisfiable";
case 417:
return "417 Expectation Failed";
case 421:
return "421 Misdirected Request";
case 426:
return "426 Upgrade Required";
case 428:
return "428 Precondition Required";
case 429:
return "429 Too Many Requests";
case 431:
return "431 Request Header Fields Too Large";
case 500:
return "500 Internal Server Error";
case 501:
return "501 Not Implemented";
case 502:
return "502 Bad Gateway";
case 503:
return "503 Service Unavailable";
case 504:
return "504 Gateway Timeout";
case 505:
return "505 HTTP Version Not Supported";
case 511:
return "511 Network Authentication Required";
default:
return util::utos(status_code);
}
}
void capitalize(std::string &s, size_t offset) {
s[offset] = util::upcase(s[offset]);
for (size_t i = offset + 1, eoi = s.size(); i < eoi; ++i) {
if (s[i - 1] == '-') {
s[i] = util::upcase(s[i]);
} else {
s[i] = util::lowcase(s[i]);
}
}
}
bool lws(const char *value) {
for (; *value; ++value) {
switch (*value) {
case '\t':
case ' ':
continue;
default:
return false;
}
}
return true;
}
void copy_url_component(std::string &dest, const http_parser_url *u, int field,
const char *url) {
if (u->field_set & (1 << field)) {
dest.assign(url + u->field_data[field].off, u->field_data[field].len);
}
}
Headers::value_type to_header(const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
bool no_index, int16_t token) {
return Header(std::string(reinterpret_cast<const char *>(name), namelen),
std::string(reinterpret_cast<const char *>(value), valuelen),
no_index, token);
}
void add_header(Headers &nva, const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen, bool no_index,
int16_t token) {
if (valuelen > 0) {
size_t i, j;
for (i = 0; i < valuelen && (value[i] == ' ' || value[i] == '\t'); ++i)
;
for (j = valuelen - 1; j > i && (value[j] == ' ' || value[j] == '\t'); --j)
;
value += i;
valuelen -= i + (valuelen - j - 1);
}
nva.push_back(to_header(name, namelen, value, valuelen, no_index, token));
}
const Headers::value_type *get_header(const Headers &nva, const char *name) {
const Headers::value_type *res = nullptr;
for (auto &nv : nva) {
if (nv.name == name) {
res = &nv;
}
}
return res;
}
std::string value_to_str(const Headers::value_type *nv) {
if (nv) {
return nv->value;
}
return "";
}
bool non_empty_value(const Headers::value_type *nv) {
return nv && !nv->value.empty();
}
nghttp2_nv make_nv(const std::string &name, const std::string &value,
bool no_index) {
uint8_t flags;
flags = no_index ? NGHTTP2_NV_FLAG_NO_INDEX : NGHTTP2_NV_FLAG_NONE;
return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
value.size(), flags};
}
void copy_headers_to_nva(std::vector<nghttp2_nv> &nva, const Headers &headers) {
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case HD_COOKIE:
case HD_CONNECTION:
case HD_HOST:
case HD_HTTP2_SETTINGS:
case HD_KEEP_ALIVE:
case HD_PROXY_CONNECTION:
case HD_SERVER:
case HD_TE:
case HD_TRANSFER_ENCODING:
case HD_UPGRADE:
case HD_VIA:
case HD_X_FORWARDED_FOR:
case HD_X_FORWARDED_PROTO:
continue;
}
nva.push_back(make_nv(kv.name, kv.value, kv.no_index));
}
}
void build_http1_headers_from_headers(std::string &hdrs,
const Headers &headers) {
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case HD_CONNECTION:
case HD_COOKIE:
case HD_HOST:
case HD_HTTP2_SETTINGS:
case HD_KEEP_ALIVE:
case HD_PROXY_CONNECTION:
case HD_SERVER:
case HD_UPGRADE:
case HD_VIA:
case HD_X_FORWARDED_FOR:
case HD_X_FORWARDED_PROTO:
continue;
}
hdrs += kv.name;
capitalize(hdrs, hdrs.size() - kv.name.size());
hdrs += ": ";
hdrs += kv.value;
hdrs += "\r\n";
}
}
int32_t determine_window_update_transmission(nghttp2_session *session,
int32_t stream_id) {
int32_t recv_length, window_size;
if (stream_id == 0) {
recv_length = nghttp2_session_get_effective_recv_data_length(session);
window_size = nghttp2_session_get_effective_local_window_size(session);
} else {
recv_length = nghttp2_session_get_stream_effective_recv_data_length(
session, stream_id);
window_size = nghttp2_session_get_stream_effective_local_window_size(
session, stream_id);
}
if (recv_length != -1 && window_size != -1) {
if (recv_length >= window_size / 2) {
return recv_length;
}
}
return -1;
}
void dump_nv(FILE *out, const char **nv) {
for (size_t i = 0; nv[i]; i += 2) {
fprintf(out, "%s: %s\n", nv[i], nv[i + 1]);
}
fputc('\n', out);
fflush(out);
}
void dump_nv(FILE *out, const nghttp2_nv *nva, size_t nvlen) {
auto end = nva + nvlen;
for (; nva != end; ++nva) {
fprintf(out, "%s: %s\n", nva->name, nva->value);
}
fputc('\n', out);
fflush(out);
}
void dump_nv(FILE *out, const Headers &nva) {
for (auto &nv : nva) {
fprintf(out, "%s: %s\n", nv.name.c_str(), nv.value.c_str());
}
fputc('\n', out);
fflush(out);
}
std::string rewrite_location_uri(const std::string &uri,
const http_parser_url &u,
const std::string &match_host,
const std::string &request_authority,
const std::string &upstream_scheme) {
// We just rewrite scheme and authority.
if ((u.field_set & (1 << UF_HOST)) == 0) {
return "";
}
auto field = &u.field_data[UF_HOST];
if (!util::startsWith(std::begin(match_host), std::end(match_host),
&uri[field->off], &uri[field->off] + field->len) ||
(match_host.size() != field->len && match_host[field->len] != ':')) {
return "";
}
std::string res;
if (!request_authority.empty()) {
res += upstream_scheme;
res += "://";
res += request_authority;
}
if (u.field_set & (1 << UF_PATH)) {
field = &u.field_data[UF_PATH];
res.append(&uri[field->off], field->len);
}
if (u.field_set & (1 << UF_QUERY)) {
field = &u.field_data[UF_QUERY];
res += "?";
res.append(&uri[field->off], field->len);
}
if (u.field_set & (1 << UF_FRAGMENT)) {
field = &u.field_data[UF_FRAGMENT];
res += "#";
res.append(&uri[field->off], field->len);
}
return res;
}
int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
size_t valuelen) {
if (!nghttp2_check_header_name(name, namelen)) {
return 0;
}
if (!nghttp2_check_header_value(value, valuelen)) {
return 0;
}
return 1;
}
int parse_http_status_code(const std::string &src) {
if (src.size() != 3) {
return -1;
}
int status = 0;
for (auto c : src) {
if (!isdigit(c)) {
return -1;
}
status *= 10;
status += c - '0';
}
if (status < 100) {
return -1;
}
return status;
}
int lookup_token(const std::string &name) {
return lookup_token(reinterpret_cast<const uint8_t *>(name.c_str()),
name.size());
}
// This function was generated by genheaderfunc.py. Inspired by h2o
// header lookup. https://github.com/h2o/h2o
int lookup_token(const uint8_t *name, size_t namelen) {
switch (namelen) {
case 2:
switch (name[1]) {
case 'e':
if (util::streq_l("t", name, 1)) {
return HD_TE;
}
break;
}
break;
case 3:
switch (name[2]) {
case 'a':
if (util::streq_l("vi", name, 2)) {
return HD_VIA;
}
break;
}
break;
case 4:
switch (name[3]) {
case 'k':
if (util::streq_l("lin", name, 3)) {
return HD_LINK;
}
break;
case 't':
if (util::streq_l("hos", name, 3)) {
return HD_HOST;
}
break;
}
break;
case 5:
switch (name[4]) {
case 'h':
if (util::streq_l(":pat", name, 4)) {
return HD__PATH;
}
break;
case 't':
if (util::streq_l(":hos", name, 4)) {
return HD__HOST;
}
break;
}
break;
case 6:
switch (name[5]) {
case 'e':
if (util::streq_l("cooki", name, 5)) {
return HD_COOKIE;
}
break;
case 'r':
if (util::streq_l("serve", name, 5)) {
return HD_SERVER;
}
break;
case 't':
if (util::streq_l("expec", name, 5)) {
return HD_EXPECT;
}
break;
}
break;
case 7:
switch (name[6]) {
case 'c':
if (util::streq_l("alt-sv", name, 6)) {
return HD_ALT_SVC;
}
break;
case 'd':
if (util::streq_l(":metho", name, 6)) {
return HD__METHOD;
}
break;
case 'e':
if (util::streq_l(":schem", name, 6)) {
return HD__SCHEME;
}
if (util::streq_l("upgrad", name, 6)) {
return HD_UPGRADE;
}
break;
case 'r':
if (util::streq_l("traile", name, 6)) {
return HD_TRAILER;
}
break;
case 's':
if (util::streq_l(":statu", name, 6)) {
return HD__STATUS;
}
break;
}
break;
case 8:
switch (name[7]) {
case 'n':
if (util::streq_l("locatio", name, 7)) {
return HD_LOCATION;
}
break;
}
break;
case 10:
switch (name[9]) {
case 'e':
if (util::streq_l("keep-aliv", name, 9)) {
return HD_KEEP_ALIVE;
}
break;
case 'n':
if (util::streq_l("connectio", name, 9)) {
return HD_CONNECTION;
}
break;
case 't':
if (util::streq_l("user-agen", name, 9)) {
return HD_USER_AGENT;
}
break;
case 'y':
if (util::streq_l(":authorit", name, 9)) {
return HD__AUTHORITY;
}
break;
}
break;
case 13:
switch (name[12]) {
case 'l':
if (util::streq_l("cache-contro", name, 12)) {
return HD_CACHE_CONTROL;
}
break;
}
break;
case 14:
switch (name[13]) {
case 'h':
if (util::streq_l("content-lengt", name, 13)) {
return HD_CONTENT_LENGTH;
}
break;
case 's':
if (util::streq_l("http2-setting", name, 13)) {
return HD_HTTP2_SETTINGS;
}
break;
}
break;
case 15:
switch (name[14]) {
case 'e':
if (util::streq_l("accept-languag", name, 14)) {
return HD_ACCEPT_LANGUAGE;
}
break;
case 'g':
if (util::streq_l("accept-encodin", name, 14)) {
return HD_ACCEPT_ENCODING;
}
break;
case 'r':
if (util::streq_l("x-forwarded-fo", name, 14)) {
return HD_X_FORWARDED_FOR;
}
break;
}
break;
case 16:
switch (name[15]) {
case 'n':
if (util::streq_l("proxy-connectio", name, 15)) {
return HD_PROXY_CONNECTION;
}
break;
}
break;
case 17:
switch (name[16]) {
case 'e':
if (util::streq_l("if-modified-sinc", name, 16)) {
return HD_IF_MODIFIED_SINCE;
}
break;
case 'g':
if (util::streq_l("transfer-encodin", name, 16)) {
return HD_TRANSFER_ENCODING;
}
break;
case 'o':
if (util::streq_l("x-forwarded-prot", name, 16)) {
return HD_X_FORWARDED_PROTO;
}
break;
}
break;
}
return -1;
}
void init_hdidx(HeaderIndex &hdidx) {
std::fill(std::begin(hdidx), std::end(hdidx), -1);
}
void index_header(HeaderIndex &hdidx, int16_t token, size_t idx) {
if (token == -1) {
return;
}
assert(token < HD_MAXIDX);
hdidx[token] = idx;
}
bool check_http2_request_pseudo_header(const HeaderIndex &hdidx,
int16_t token) {
switch (token) {
case HD__AUTHORITY:
case HD__METHOD:
case HD__PATH:
case HD__SCHEME:
return hdidx[token] == -1;
default:
return false;
}
}
bool check_http2_response_pseudo_header(const HeaderIndex &hdidx,
int16_t token) {
switch (token) {
case HD__STATUS:
return hdidx[token] == -1;
default:
return false;
}
}
bool http2_header_allowed(int16_t token) {
switch (token) {
case HD_CONNECTION:
case HD_KEEP_ALIVE:
case HD_PROXY_CONNECTION:
case HD_TRANSFER_ENCODING:
case HD_UPGRADE:
return false;
default:
return true;
}
}
bool http2_mandatory_request_headers_presence(const HeaderIndex &hdidx) {
if (hdidx[HD__METHOD] == -1 || hdidx[HD__PATH] == -1 ||
hdidx[HD__SCHEME] == -1 ||
(hdidx[HD__AUTHORITY] == -1 && hdidx[HD_HOST] == -1)) {
return false;
}
return true;
}
const Headers::value_type *get_header(const HeaderIndex &hdidx, int16_t token,
const Headers &nva) {
auto i = hdidx[token];
if (i == -1) {
return nullptr;
}
return &nva[i];
}
namespace {
template <typename InputIt> InputIt skip_lws(InputIt first, InputIt last) {
for (; first != last; ++first) {
switch (*first) {
case ' ':
case '\t':
continue;
default:
return first;
}
}
return first;
}
} // namespace
namespace {
template <typename InputIt>
InputIt skip_to_next_field(InputIt first, InputIt last) {
for (; first != last; ++first) {
switch (*first) {
case ' ':
case '\t':
case ',':
continue;
default:
return first;
}
}
return first;
}
} // namespace
namespace {
// Skip to the right dquote ('"'), handling backslash escapes.
// Returns |last| if input is not terminated with '"'.
template <typename InputIt>
InputIt skip_to_right_dquote(InputIt first, InputIt last) {
for (; first != last;) {
switch (*first) {
case '"':
return first;
case '\\':
++first;
if (first == last) {
return first;
}
break;
}
++first;
}
return first;
}
} // namespace
namespace {
// Returns true if link-param does not match pattern |pat| of length
// |patlen| or it has empty value (""). |pat| should be parmname
// followed by "=".
bool check_link_param_empty(const char *first, const char *last,
const char *pat, size_t patlen) {
if (first + patlen <= last) {
if (std::equal(pat, pat + patlen, first, util::CaseCmp())) {
// we only accept URI if pat is followd by "" (e.g.,
// loadpolicy="") here.
if (first + patlen + 2 <= last) {
if (*(first + patlen) != '"' || *(first + patlen + 1) != '"') {
return false;
}
} else {
// here we got invalid production (anchor=") or anchor=?
return false;
}
}
}
return true;
}
} // namespace
namespace {
std::pair<LinkHeader, const char *>
parse_next_link_header_once(const char *first, const char *last) {
first = skip_to_next_field(first, last);
if (first == last || *first != '<') {
return {{{nullptr, nullptr}}, last};
}
auto url_first = ++first;
first = std::find(first, last, '>');
if (first == last) {
return {{{nullptr, nullptr}}, first};
}
auto url_last = first++;
if (first == last) {
return {{{nullptr, nullptr}}, first};
}
// we expect ';' or ',' here
switch (*first) {
case ',':
return {{{nullptr, nullptr}}, ++first};
case ';':
++first;
break;
default:
return {{{nullptr, nullptr}}, last};
}
auto ok = false;
auto ign = false;
for (;;) {
first = skip_lws(first, last);
if (first == last) {
return {{{nullptr, nullptr}}, first};
}
// we expect link-param
// rel can take several relations using quoted form.
static constexpr char PLP[] = "rel=\"";
static constexpr size_t PLPLEN = sizeof(PLP) - 1;
static constexpr char PLT[] = "preload";
static constexpr size_t PLTLEN = sizeof(PLT) - 1;
if (first + PLPLEN < last && *(first + PLPLEN - 1) == '"' &&
std::equal(PLP, PLP + PLPLEN, first, util::CaseCmp())) {
// we have to search preload in whitespace separated list:
// rel="preload something http://example.org/foo"
first += PLPLEN;
auto start = first;
for (; first != last;) {
if (*first != ' ' && *first != '"') {
++first;
continue;
}
if (start == first) {
return {{{nullptr, nullptr}}, last};
}
if (!ok && start + PLTLEN == first &&
std::equal(PLT, PLT + PLTLEN, start, util::CaseCmp())) {
ok = true;
}
if (*first == '"') {
break;
}
first = skip_lws(first, last);
start = first;
}
if (first == last) {
return {{{nullptr, nullptr}}, first};
}
assert(*first == '"');
++first;
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
return {{{nullptr, nullptr}}, last};
}
// we are only interested in rel=preload parameter. Others are
// simply skipped.
static constexpr char PL[] = "rel=preload";
static constexpr size_t PLLEN = sizeof(PL) - 1;
if (first + PLLEN == last) {
if (std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
ok = true;
// this is the end of sequence
return {{{url_first, url_last}}, last};
}
} else if (first + PLLEN + 1 <= last) {
switch (*(first + PLLEN)) {
case ',':
if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
break;
}
ok = true;
// skip including ','
first += PLLEN + 1;
return {{{url_first, url_last}}, first};
case ';':
if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
break;
}
ok = true;
// skip including ';'
first += PLLEN + 1;
// continue parse next link-param
continue;
}
}
// we have to reject URI if we have nonempty anchor parameter.
static constexpr char ANCHOR[] = "anchor=";
static constexpr size_t ANCHORLEN = sizeof(ANCHOR) - 1;
if (!ign && !check_link_param_empty(first, last, ANCHOR, ANCHORLEN)) {
ign = true;
}
// reject URI if we have non-empty loadpolicy. This could be
// tightened up to just pick up "next" or "insert".
static constexpr char LOADPOLICY[] = "loadpolicy=";
static constexpr size_t LOADPOLICYLEN = sizeof(LOADPOLICY) - 1;
if (!ign &&
!check_link_param_empty(first, last, LOADPOLICY, LOADPOLICYLEN)) {
ign = true;
}
auto param_first = first;
for (; first != last;) {
if (util::in_attr_char(*first)) {
++first;
continue;
}
// '*' is only allowed at the end of parameter name and must be
// followed by '='
if (last - first >= 2 && first != param_first) {
if (*first == '*' && *(first + 1) == '=') {
++first;
break;
}
}
if (*first == '=' || *first == ';' || *first == ',') {
break;
}
return {{{nullptr, nullptr}}, last};
}
if (param_first == first) {
// empty parmname
return {{{nullptr, nullptr}}, last};
}
// link-param without value is acceptable (see link-extension) if
// it is not followed by '='
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
// now parsing link-param value
assert(*first == '=');
++first;
if (first == last) {
// empty value is not acceptable
return {{{nullptr, nullptr}}, first};
}
if (*first == '"') {
// quoted-string
first = skip_to_right_dquote(first + 1, last);
if (first == last) {
return {{{nullptr, nullptr}}, first};
}
++first;
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
return {{{nullptr, nullptr}}, last};
}
// not quoted-string, skip to next ',' or ';'
if (*first == ',' || *first == ';') {
// empty value
return {{{nullptr, nullptr}}, last};
}
for (; first != last; ++first) {
if (*first == ',' || *first == ';') {
break;
}
}
if (first == last || *first == ',') {
goto almost_done;
}
assert(*first == ';');
++first;
// parse next link-param
}
almost_done:
assert(first == last || *first == ',');
if (first != last) {
++first;
}
if (ok && !ign) {
return {{{url_first, url_last}}, first};
}
return {{{nullptr, nullptr}}, first};
}
} // namespace
std::vector<LinkHeader> parse_link_header(const char *src, size_t len) {
auto first = src;
auto last = src + len;
std::vector<LinkHeader> res;
for (; first != last;) {
auto rv = parse_next_link_header_once(first, last);
first = rv.second;
if (rv.first.uri.first != nullptr && rv.first.uri.second != nullptr) {
res.push_back(rv.first);
}
}
return res;
}
namespace {
void eat_file(std::string &path) {
if (path.empty()) {
path = "/";
return;
}
auto p = path.size() - 1;
if (path[p] == '/') {
return;
}
p = path.rfind('/', p);
if (p == std::string::npos) {
// this should not happend in normal case, where we expect path
// starts with '/'
path = "/";
return;
}
path.erase(std::begin(path) + p + 1, std::end(path));
}
} // namespace
namespace {
void eat_dir(std::string &path) {
if (path.empty()) {
path = "/";
return;
}
auto p = path.size() - 1;
if (path[p] != '/') {
p = path.rfind('/', p);
if (p == std::string::npos) {
// this should not happend in normal case, where we expect path
// starts with '/'
path = "/";
return;
}
}
if (path[p] == '/') {
if (p == 0) {
return;
}
--p;
}
p = path.rfind('/', p);
if (p == std::string::npos) {
// this should not happend in normal case, where we expect path
// starts with '/'
path = "/";
return;
}
path.erase(std::begin(path) + p + 1, std::end(path));
}
} // namespace
std::string path_join(const char *base_path, size_t base_pathlen,
const char *base_query, size_t base_querylen,
const char *rel_path, size_t rel_pathlen,
const char *rel_query, size_t rel_querylen) {
std::string res;
if (rel_pathlen == 0) {
if (base_pathlen == 0) {
res = "/";
} else {
res.assign(base_path, base_pathlen);
}
if (rel_querylen == 0) {
if (base_querylen) {
res += "?";
res.append(base_query, base_querylen);
}
return res;
}
res += "?";
res.append(rel_query, rel_querylen);
return res;
}
auto first = rel_path;
auto last = rel_path + rel_pathlen;
if (rel_path[0] == '/') {
res = "/";
++first;
} else if (base_pathlen == 0) {
res = "/";
} else {
res.assign(base_path, base_pathlen);
}
for (; first != last;) {
if (*first == '.') {
if (first + 1 == last) {
break;
}
if (*(first + 1) == '/') {
first += 2;
continue;
}
if (*(first + 1) == '.') {
if (first + 2 == last) {
eat_dir(res);
break;
}
if (*(first + 2) == '/') {
eat_dir(res);
first += 3;
continue;
}
}
}
if (res.back() != '/') {
eat_file(res);
}
auto slash = std::find(first, last, '/');
if (slash == last) {
res.append(first, last);
break;
}
res.append(first, slash + 1);
first = slash + 1;
for (; first != last && *first == '/'; ++first)
;
}
if (rel_querylen) {
res += "?";
res.append(rel_query, rel_querylen);
}
return res;
}
bool expect_response_body(int status_code) {
return status_code / 100 != 1 && status_code != 304 && status_code != 204;
}
bool expect_response_body(const std::string &method, int status_code) {
return method != "HEAD" && expect_response_body(status_code);
}
} // namespace http2
} // namespace nghttp2
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