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nghttp2/src/http2.h

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2013 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.
*/
#ifndef HTTP2_H
#define HTTP2_H
#include "nghttp2_config.h"
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <array>
#include <nghttp2/nghttp2.h>
#include "http-parser/http_parser.h"
#include "util.h"
#include "memchunk.h"
namespace nghttp2 {
struct Header {
Header(std::string name, std::string value, bool no_index = false,
int32_t token = -1)
: name(std::move(name)),
value(std::move(value)),
token(token),
no_index(no_index) {}
Header() : token(-1), no_index(false) {}
bool operator==(const Header &other) const {
return name == other.name && value == other.value;
}
bool operator<(const Header &rhs) const {
return name < rhs.name || (name == rhs.name && value < rhs.value);
}
std::string name;
std::string value;
int32_t token;
bool no_index;
};
using Headers = std::vector<Header>;
namespace http2 {
std::string get_status_string(unsigned int status_code);
// Returns string version of |status_code|. This function can handle
// only predefined status code. Otherwise, returns nullptr.
const char *stringify_status(unsigned int status_code);
void capitalize(DefaultMemchunks *buf, const std::string &s);
// Returns true if |value| is LWS
bool lws(const char *value);
// Copies the |field| component value from |u| and |url| to the
// |dest|. If |u| does not have |field|, then this function does
// nothing.
void copy_url_component(std::string &dest, const http_parser_url *u, int field,
const char *url);
Headers::value_type to_header(const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
bool no_index, int32_t token);
// Add name/value pairs to |nva|. If |no_index| is true, this
// name/value pair won't be indexed when it is forwarded to the next
// hop. This function strips white spaces around |value|.
void add_header(Headers &nva, const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen, bool no_index,
int32_t token);
// Returns pointer to the entry in |nva| which has name |name|. If
// more than one entries which have the name |name|, last occurrence
// in |nva| is returned. If no such entry exist, returns nullptr.
const Headers::value_type *get_header(const Headers &nva, const char *name);
// Returns nv->second if nv is not nullptr. Otherwise, returns "".
std::string value_to_str(const Headers::value_type *nv);
// Returns true if the value of |nv| is not empty.
bool non_empty_value(const Headers::value_type *nv);
// Creates nghttp2_nv using |name| and |value| and returns it. The
// returned value only references the data pointer to name.c_str() and
// value.c_str(). If |no_index| is true, nghttp2_nv flags member has
// NGHTTP2_NV_FLAG_NO_INDEX flag set.
nghttp2_nv make_nv(const std::string &name, const std::string &value,
bool no_index = false);
nghttp2_nv make_nv_nocopy(const std::string &name, const std::string &value,
bool no_index = false);
// Create nghttp2_nv from string literal |name| and |value|.
template <size_t N, size_t M>
constexpr nghttp2_nv make_nv_ll(const char(&name)[N], const char(&value)[M]) {
return {(uint8_t *)name, (uint8_t *)value, N - 1, M - 1,
NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE};
}
// Create nghttp2_nv from string literal |name| and c-string |value|.
template <size_t N>
nghttp2_nv make_nv_lc(const char(&name)[N], const char *value) {
return {(uint8_t *)name, (uint8_t *)value, N - 1, strlen(value),
NGHTTP2_NV_FLAG_NO_COPY_NAME};
}
template <size_t N>
nghttp2_nv make_nv_lc_nocopy(const char(&name)[N], const char *value) {
return {(uint8_t *)name, (uint8_t *)value, N - 1, strlen(value),
NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE};
}
// Create nghttp2_nv from string literal |name| and std::string
// |value|.
template <size_t N>
nghttp2_nv make_nv_ls(const char(&name)[N], const std::string &value) {
return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
NGHTTP2_NV_FLAG_NO_COPY_NAME};
}
template <size_t N>
nghttp2_nv make_nv_ls_nocopy(const char(&name)[N], const std::string &value) {
return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE};
}
template <size_t N>
nghttp2_nv make_nv_ls_nocopy(const char(&name)[N], const StringRef &value) {
return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE};
}
// Appends headers in |headers| to |nv|. |headers| must be indexed
// before this call (its element's token field is assigned). Certain
// headers, including disallowed headers in HTTP/2 spec and headers
// which require special handling (i.e. via), are not copied.
void copy_headers_to_nva(std::vector<nghttp2_nv> &nva, const Headers &headers);
// Just like copy_headers_to_nva(), but this adds
// NGHTTP2_NV_FLAG_NO_COPY_NAME and NGHTTP2_NV_FLAG_NO_COPY_VALUE.
void copy_headers_to_nva_nocopy(std::vector<nghttp2_nv> &nva,
const Headers &headers);
// Appends HTTP/1.1 style header lines to |buf| from headers in
// |headers|. |headers| must be indexed before this call (its
// element's token field is assigned). Certain headers, which
// requires special handling (i.e. via and cookie), are not appended.
void build_http1_headers_from_headers(DefaultMemchunks *buf,
const Headers &headers);
// Return positive window_size_increment if WINDOW_UPDATE should be
// sent for the stream |stream_id|. If |stream_id| == 0, this function
// determines the necessity of the WINDOW_UPDATE for a connection.
//
// If the function determines WINDOW_UPDATE is not necessary at the
// moment, it returns -1.
int32_t determine_window_update_transmission(nghttp2_session *session,
int32_t stream_id);
// Dumps name/value pairs in |nv| to |out|. The |nv| must be
// terminated by nullptr.
void dump_nv(FILE *out, const char **nv);
// Dumps name/value pairs in |nva| to |out|.
void dump_nv(FILE *out, const nghttp2_nv *nva, size_t nvlen);
// Dumps name/value pairs in |nva| to |out|.
void dump_nv(FILE *out, const Headers &nva);
// Rewrites redirection URI which usually appears in location header
// field. The |uri| is the URI in the location header field. The |u|
// stores the result of parsed |uri|. The |request_authority| is the
// host or :authority header field value in the request. The
// |upstream_scheme| is either "https" or "http" in the upstream
// interface. Rewrite is done only if location header field value
// contains |match_host| as host excluding port. The |match_host| and
// |request_authority| could be different. If |request_authority| is
// empty, strip authority.
//
// This function returns the new rewritten URI on success. If the
// location URI is not subject to the rewrite, this function returns
// emtpy string.
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);
// Checks the header name/value pair using nghttp2_check_header_name()
// and nghttp2_check_header_value(). If both function returns nonzero,
// this function returns nonzero.
int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
size_t valuelen);
// Returns parsed HTTP status code. Returns -1 on failure.
int parse_http_status_code(const std::string &src);
// Header fields to be indexed, except HD_MAXIDX which is convenient
// member to get maximum value.
//
// generated by genheaderfunc.py
enum {
HD__AUTHORITY,
HD__HOST,
HD__METHOD,
HD__PATH,
HD__SCHEME,
HD__STATUS,
HD_ACCEPT_ENCODING,
HD_ACCEPT_LANGUAGE,
HD_ALT_SVC,
HD_CACHE_CONTROL,
HD_CONNECTION,
HD_CONTENT_LENGTH,
HD_CONTENT_TYPE,
HD_COOKIE,
HD_DATE,
HD_EXPECT,
HD_FORWARDED,
HD_HOST,
HD_HTTP2_SETTINGS,
HD_IF_MODIFIED_SINCE,
HD_KEEP_ALIVE,
HD_LINK,
HD_LOCATION,
HD_PROXY_CONNECTION,
HD_SERVER,
HD_TE,
HD_TRAILER,
HD_TRANSFER_ENCODING,
HD_UPGRADE,
HD_USER_AGENT,
HD_VIA,
HD_X_FORWARDED_FOR,
HD_X_FORWARDED_PROTO,
HD_MAXIDX,
};
using HeaderIndex = std::array<int16_t, HD_MAXIDX>;
// Looks up header token for header name |name| of length |namelen|.
// Only headers we are interested in are tokenized. If header name
// cannot be tokenized, returns -1.
int lookup_token(const uint8_t *name, size_t namelen);
int lookup_token(const std::string &name);
// Initializes |hdidx|, header index. The |hdidx| must point to the
// array containing at least HD_MAXIDX elements.
void init_hdidx(HeaderIndex &hdidx);
// Indexes header |token| using index |idx|.
void index_header(HeaderIndex &hdidx, int32_t token, size_t idx);
// Returns header denoted by |token| using index |hdidx|.
const Headers::value_type *get_header(const HeaderIndex &hdidx, int32_t token,
const Headers &nva);
Headers::value_type *get_header(const HeaderIndex &hdidx, int32_t token,
Headers &nva);
struct LinkHeader {
// The region of URI is [uri.first, uri.second).
std::pair<const char *, const char *> uri;
};
// Returns next URI-reference in Link header field value |src| of
// length |len|. If no URI-reference found after searching all input,
// returned uri field is empty. This imply that empty URI-reference
// is ignored during parsing.
std::vector<LinkHeader> parse_link_header(const char *src, size_t len);
// Constructs path by combining base path |base_path| of length
// |base_pathlen| with another path |rel_path| of length
// |rel_pathlen|. The base path and another path can have optional
// query component. This function assumes |base_path| is normalized.
// In other words, it does not contain ".." or "." path components
// and starts with "/" if it is not empty.
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);
// true if response has body, taking into account the request method
// and status code.
bool expect_response_body(const std::string &method, int status_code);
bool expect_response_body(int method_token, int status_code);
// true if response has body, taking into account status code only.
bool expect_response_body(int status_code);
// Looks up method token for method name |name| of length |namelen|.
// Only methods defined in http-parser/http-parser.h (http_method) are
// tokenized. If method name cannot be tokenized, returns -1.
int lookup_method_token(const uint8_t *name, size_t namelen);
int lookup_method_token(const std::string &name);
// Returns string representation of |method_token|. This is wrapper
// function over http_method_str from http-parser. If |method_token|
// is not known to http-parser, "<unknown>" is returned. The returned
// StringRef is guaranteed to be NULL-terminated.
StringRef to_method_string(int method_token);
template <typename InputIt>
std::string normalize_path(InputIt first, InputIt last) {
// First, decode %XX for unreserved characters, then do
// http2::join_path
std::string result;
// We won't find %XX if length is less than 3.
if (last - first < 3) {
result.assign(first, last);
} else {
for (; first < last - 2;) {
if (*first == '%') {
if (util::is_hex_digit(*(first + 1)) &&
util::is_hex_digit(*(first + 2))) {
auto c = (util::hex_to_uint(*(first + 1)) << 4) +
util::hex_to_uint(*(first + 2));
if (util::in_rfc3986_unreserved_chars(c)) {
result += c;
first += 3;
continue;
}
result += '%';
result += util::upcase(*(first + 1));
result += util::upcase(*(first + 2));
first += 3;
continue;
}
}
result += *first++;
}
result.append(first, last);
}
return path_join(nullptr, 0, nullptr, 0, result.c_str(), result.size(),
nullptr, 0);
}
template <typename InputIt>
std::string rewrite_clean_path(InputIt first, InputIt last) {
if (first == last || *first != '/') {
return std::string(first, last);
}
// probably, not necessary most of the case, but just in case.
auto fragment = std::find(first, last, '#');
auto query = std::find(first, fragment, '?');
auto path = normalize_path(first, query);
if (query != fragment) {
path.append(query, fragment);
}
return path;
}
// Stores path component of |uri| in *base. Its extracted length is
// stored in *baselen. The extracted path does not include query
// component. This function returns 0 if it succeeds, or -1.
int get_pure_path_component(const char **base, size_t *baselen,
const std::string &uri);
// Deduces scheme, authority and path from given |uri| of length
// |len|, and stores them in |scheme|, |authority|, and |path|
// respectively. If |uri| is relative path, path resolution is taken
// palce using path given in |base| of length |baselen|. This
// function returns 0 if it succeeds, or -1.
int construct_push_component(std::string &scheme, std::string &authority,
std::string &path, const char *base,
size_t baselen, const char *uri, size_t len);
} // namespace http2
} // namespace nghttp2
#endif // HTTP2_H
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