mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-11-04 06:00:37 +00:00
560 lines
14 KiB
C++
560 lines
14 KiB
C++
/*
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* Copyright (c) 2013-2023, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#include <algorithm>
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#include <utility>
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#include <stdio.h>
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#include <ctime>
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#include "util.h"
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#include "Base.h"
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#include "HTTP.h"
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namespace i2p
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{
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namespace http
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{
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const std::vector<std::string> HTTP_METHODS = {
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"GET", "HEAD", "POST", "PUT", "PATCH", "DELETE", "OPTIONS", "CONNECT", // HTTP basic methods
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"COPY", "LOCK", "MKCOL", "MOVE", "PROPFIND", "PROPPATCH", "UNLOCK", "SEARCH" // WebDAV methods, for SEARCH see rfc5323
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};
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const std::vector<std::string> HTTP_VERSIONS = {
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"HTTP/1.0", "HTTP/1.1"
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};
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const std::vector<const char *> weekdays = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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const std::vector<const char *> months = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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inline bool is_http_version(const std::string & str) {
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return std::find(HTTP_VERSIONS.begin(), HTTP_VERSIONS.end(), str) != std::end(HTTP_VERSIONS);
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}
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inline bool is_http_method(const std::string & str) {
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return std::find(HTTP_METHODS.begin(), HTTP_METHODS.end(), str) != std::end(HTTP_METHODS);
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}
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void strsplit(const std::string & line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) {
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std::size_t count = 0;
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std::stringstream ss(line);
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std::string token;
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while (1) {
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count++;
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if (limit > 0 && count >= limit)
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delim = '\n'; /* reset delimiter */
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if (!std::getline(ss, token, delim))
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break;
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tokens.push_back(token);
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}
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}
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static std::pair<std::string, std::string> parse_header_line(const std::string& line)
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{
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std::size_t pos = 0;
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std::size_t len = 1; /*: */
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std::size_t max = line.length();
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if ((pos = line.find(':', pos)) == std::string::npos)
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return std::make_pair("", ""); // no ':' found
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if (pos + 1 < max) // ':' at the end of header is valid
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{
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while ((pos + len) < max && isspace(line.at(pos + len)))
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len++;
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if (len == 1)
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return std::make_pair("", ""); // no following space, but something else
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}
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return std::make_pair(line.substr(0, pos), line.substr(pos + len));
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}
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void gen_rfc7231_date(std::string & out) {
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std::time_t now = std::time(nullptr);
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char buf[128];
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std::tm *tm = std::gmtime(&now);
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snprintf(buf, sizeof(buf), "%s, %02d %s %d %02d:%02d:%02d GMT",
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weekdays[tm->tm_wday], tm->tm_mday, months[tm->tm_mon],
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tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec
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);
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out = buf;
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}
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bool URL::parse(const char *str, std::size_t len) {
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std::string url(str, len ? len : strlen(str));
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return parse(url);
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}
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bool URL::parse(const std::string& url) {
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std::size_t pos_p = 0; /* < current parse position */
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std::size_t pos_c = 0; /* < work position */
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if(url.at(0) != '/' || pos_p > 0) {
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std::size_t pos_s = 0;
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/* schema */
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pos_c = url.find("://");
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if (pos_c != std::string::npos) {
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schema = url.substr(0, pos_c);
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pos_p = pos_c + 3;
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}
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/* user[:pass] */
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pos_s = url.find('/', pos_p); /* find first slash */
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pos_c = url.find('@', pos_p); /* find end of 'user' or 'user:pass' part */
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if (pos_c != std::string::npos && (pos_s == std::string::npos || pos_s > pos_c)) {
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std::size_t delim = url.find(':', pos_p);
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if (delim && delim != std::string::npos && delim < pos_c) {
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user = url.substr(pos_p, delim - pos_p);
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delim += 1;
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pass = url.substr(delim, pos_c - delim);
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} else if(delim) {
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user = url.substr(pos_p, pos_c - pos_p);
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}
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pos_p = pos_c + 1;
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}
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/* hostname[:port][/path] */
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if (url.at(pos_p) == '[') // ipv6
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{
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auto pos_b = url.find(']', pos_p);
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if (pos_b == std::string::npos) return false;
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ipv6 = true;
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pos_c = url.find_first_of(":/", pos_b);
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}
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else
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pos_c = url.find_first_of(":/", pos_p);
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if (pos_c == std::string::npos) {
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/* only hostname, without post and path */
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host = ipv6 ?
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url.substr(pos_p + 1, url.length() - 1) :
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url.substr(pos_p, std::string::npos);
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return true;
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} else if (url.at(pos_c) == ':') {
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host = ipv6 ?
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url.substr(pos_p + 1, pos_c - pos_p - 2) :
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url.substr(pos_p, pos_c - pos_p);
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/* port[/path] */
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pos_p = pos_c + 1;
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pos_c = url.find('/', pos_p);
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std::string port_str = (pos_c == std::string::npos)
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? url.substr(pos_p, std::string::npos)
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: url.substr(pos_p, pos_c - pos_p);
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/* stoi throws exception on failure, we don't need it */
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port = 0;
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for (char c : port_str) {
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if (c < '0' || c > '9')
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return false;
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port *= 10;
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port += c - '0';
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}
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if (pos_c == std::string::npos)
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return true; /* no path part */
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pos_p = pos_c;
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} else {
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/* start of path part found */
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host = ipv6 ?
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url.substr(pos_p + 1, pos_c - pos_p - 2) :
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url.substr(pos_p, pos_c - pos_p);
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pos_p = pos_c;
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}
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}
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/* pos_p now at start of path part */
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pos_c = url.find_first_of("?#", pos_p);
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if (pos_c == std::string::npos) {
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/* only path, without fragment and query */
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path = url.substr(pos_p, std::string::npos);
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return true;
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} else if (url.at(pos_c) == '?') {
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/* found query part */
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hasquery = true;
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path = url.substr(pos_p, pos_c - pos_p);
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pos_p = pos_c + 1;
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pos_c = url.find('#', pos_p);
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if (pos_c == std::string::npos) {
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/* no fragment */
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query = url.substr(pos_p, std::string::npos);
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return true;
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} else {
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query = url.substr(pos_p, pos_c - pos_p);
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pos_p = pos_c + 1;
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}
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} else {
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/* found fragment part */
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path = url.substr(pos_p, pos_c - pos_p);
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pos_p = pos_c + 1;
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}
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/* pos_p now at start of fragment part */
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frag = url.substr(pos_p, std::string::npos);
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return true;
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}
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bool URL::parse_query(std::map<std::string, std::string> & params) {
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std::vector<std::string> tokens;
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strsplit(query, tokens, '&');
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params.clear();
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for (const auto& it : tokens) {
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if (!it.length()) // empty
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continue;
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std::size_t eq = it.find ('=');
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if (eq != std::string::npos) {
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auto e = std::pair<std::string, std::string>(it.substr(0, eq), it.substr(eq + 1));
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params.insert(e);
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} else {
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auto e = std::pair<std::string, std::string>(it, "");
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params.insert(e);
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}
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}
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return true;
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}
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std::string URL::to_string() {
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std::string out = "";
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if (schema != "") {
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out = schema + "://";
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if (user != "" && pass != "") {
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out += user + ":" + pass + "@";
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} else if (user != "") {
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out += user + "@";
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}
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if (ipv6) {
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if (port) {
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out += "[" + host + "]:" + std::to_string(port);
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} else {
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out += "[" + host + "]";
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}
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} else {
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if (port) {
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out += host + ":" + std::to_string(port);
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} else {
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out += host;
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}
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}
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}
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out += path;
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if (hasquery) // add query even if it was empty
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out += "?";
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if (query != "")
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out += query;
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if (frag != "")
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out += "#" + frag;
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return out;
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}
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bool URL::is_i2p() const
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{
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return host.rfind(".i2p") == ( host.size() - 4 );
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}
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void HTTPMsg::add_header(const char *name, std::string & value, bool replace) {
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add_header(name, value.c_str(), replace);
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}
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void HTTPMsg::add_header(const char *name, const char *value, bool replace) {
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std::size_t count = headers.count(name);
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if (count && !replace)
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return;
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if (count) {
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headers[name] = value;
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return;
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}
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headers.insert(std::pair<std::string, std::string>(name, value));
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}
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void HTTPMsg::del_header(const char *name) {
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headers.erase(name);
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}
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int HTTPReq::parse(const char *buf, size_t len) {
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std::string str(buf, len);
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return parse(str);
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}
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int HTTPReq::parse(const std::string& str) {
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enum { REQ_LINE, HEADER_LINE } expect = REQ_LINE;
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std::size_t eoh = str.find(HTTP_EOH); /* request head size */
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std::size_t eol = 0, pos = 0;
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URL url;
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if (eoh == std::string::npos)
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return 0; /* str not contains complete request */
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while ((eol = str.find(CRLF, pos)) != std::string::npos) {
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if (expect == REQ_LINE) {
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std::string line = str.substr(pos, eol - pos);
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std::vector<std::string> tokens;
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strsplit(line, tokens, ' ');
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if (tokens.size() != 3)
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return -1;
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if (!is_http_method(tokens[0]))
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return -1;
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if (!is_http_version(tokens[2]))
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return -1;
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if (!url.parse(tokens[1]))
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return -1;
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/* all ok */
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method = tokens[0];
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uri = tokens[1];
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version = tokens[2];
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expect = HEADER_LINE;
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}
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else
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{
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std::string line = str.substr(pos, eol - pos);
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auto p = parse_header_line(line);
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if (p.first.length () > 0)
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headers.push_back (p);
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else
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return -1;
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}
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pos = eol + strlen(CRLF);
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if (pos >= eoh)
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break;
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}
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return eoh + strlen(HTTP_EOH);
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}
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void HTTPReq::write(std::ostream & o)
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{
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o << method << " " << uri << " " << version << CRLF;
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for (auto & h : headers)
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o << h.first << ": " << h.second << CRLF;
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o << CRLF;
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}
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std::string HTTPReq::to_string()
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{
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std::stringstream ss;
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write(ss);
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return ss.str();
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}
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void HTTPReq::AddHeader (const std::string& name, const std::string& value)
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{
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headers.push_back (std::make_pair(name, value));
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}
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void HTTPReq::UpdateHeader (const std::string& name, const std::string& value)
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{
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for (auto& it : headers)
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if (it.first == name)
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{
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it.second = value;
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break;
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}
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}
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void HTTPReq::RemoveHeader (const std::string& name, const std::string& exempt)
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{
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for (auto it = headers.begin (); it != headers.end ();)
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{
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if (!it->first.compare(0, name.length (), name) && it->first != exempt)
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it = headers.erase (it);
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else
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it++;
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}
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}
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std::string HTTPReq::GetHeader (const std::string& name) const
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{
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for (auto& it : headers)
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if (it.first == name)
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return it.second;
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return "";
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}
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size_t HTTPReq::GetNumHeaders (const std::string& name) const
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{
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size_t num = 0;
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for (auto& it : headers)
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if (it.first == name) num++;
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return num;
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}
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bool HTTPRes::is_chunked() const
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{
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auto it = headers.find("Transfer-Encoding");
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if (it == headers.end())
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return false;
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if (it->second.find("chunked") != std::string::npos)
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return true;
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return false;
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}
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bool HTTPRes::is_gzipped(bool includingI2PGzip) const
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{
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auto it = headers.find("Content-Encoding");
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if (it == headers.end())
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return false; /* no header */
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if (it->second.find("gzip") != std::string::npos)
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return true; /* gotcha! */
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if (includingI2PGzip && it->second.find("x-i2p-gzip") != std::string::npos)
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return true;
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return false;
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}
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long int HTTPMsg::content_length() const
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{
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unsigned long int length = 0;
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auto it = headers.find("Content-Length");
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if (it == headers.end())
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return -1;
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errno = 0;
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length = std::strtoul(it->second.c_str(), (char **) NULL, 10);
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if (errno != 0)
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return -1;
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return length;
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}
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int HTTPRes::parse(const char *buf, size_t len) {
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std::string str(buf, len);
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return parse(str);
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}
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int HTTPRes::parse(const std::string& str) {
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enum { RES_LINE, HEADER_LINE } expect = RES_LINE;
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std::size_t eoh = str.find(HTTP_EOH); /* request head size */
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std::size_t eol = 0, pos = 0;
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if (eoh == std::string::npos)
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return 0; /* str not contains complete request */
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while ((eol = str.find(CRLF, pos)) != std::string::npos) {
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if (expect == RES_LINE) {
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std::string line = str.substr(pos, eol - pos);
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std::vector<std::string> tokens;
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strsplit(line, tokens, ' ', 3);
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if (tokens.size() != 3)
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return -1;
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if (!is_http_version(tokens[0]))
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return -1;
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code = atoi(tokens[1].c_str());
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if (code < 100 || code >= 600)
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return -1;
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/* all ok */
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version = tokens[0];
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status = tokens[2];
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expect = HEADER_LINE;
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} else {
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std::string line = str.substr(pos, eol - pos);
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auto p = parse_header_line(line);
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if (p.first.length () > 0)
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headers.insert (p);
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else
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return -1;
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}
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pos = eol + strlen(CRLF);
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if (pos >= eoh)
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break;
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}
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return eoh + strlen(HTTP_EOH);
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}
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std::string HTTPRes::to_string() {
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if (version == "HTTP/1.1" && headers.count("Date") == 0) {
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std::string date;
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gen_rfc7231_date(date);
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add_header("Date", date.c_str());
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}
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if (status == "OK" && code != 200)
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status = HTTPCodeToStatus(code); // update
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if (body.length() > 0 && headers.count("Content-Length") == 0)
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add_header("Content-Length", std::to_string(body.length()).c_str());
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/* build response */
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std::stringstream ss;
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ss << version << " " << code << " " << status << CRLF;
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for (auto & h : headers) {
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ss << h.first << ": " << h.second << CRLF;
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}
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ss << CRLF;
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if (body.length() > 0)
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ss << body;
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return ss.str();
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}
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const char * HTTPCodeToStatus(int code) {
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const char *ptr;
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switch (code) {
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case 105: ptr = "Name Not Resolved"; break;
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/* success */
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case 200: ptr = "OK"; break;
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case 206: ptr = "Partial Content"; break;
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/* redirect */
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case 301: ptr = "Moved Permanently"; break;
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case 302: ptr = "Found"; break;
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case 304: ptr = "Not Modified"; break;
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case 307: ptr = "Temporary Redirect"; break;
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/* client error */
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case 400: ptr = "Bad Request"; break;
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case 401: ptr = "Unauthorized"; break;
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case 403: ptr = "Forbidden"; break;
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case 404: ptr = "Not Found"; break;
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case 407: ptr = "Proxy Authentication Required"; break;
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case 408: ptr = "Request Timeout"; break;
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/* server error */
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case 500: ptr = "Internal Server Error"; break;
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|
case 502: ptr = "Bad Gateway"; break;
|
|
case 503: ptr = "Not Implemented"; break;
|
|
case 504: ptr = "Gateway Timeout"; break;
|
|
default: ptr = "Unknown Status"; break;
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
std::string UrlDecode(const std::string& data, bool allow_null)
|
|
{
|
|
std::string decoded(data);
|
|
size_t pos = 0;
|
|
while ((pos = decoded.find('%', pos)) != std::string::npos)
|
|
{
|
|
char c = strtol(decoded.substr(pos + 1, 2).c_str(), NULL, 16);
|
|
if (c == '\0' && !allow_null)
|
|
{
|
|
pos += 3;
|
|
continue;
|
|
}
|
|
decoded.replace(pos, 3, 1, c);
|
|
pos++;
|
|
}
|
|
return decoded;
|
|
}
|
|
|
|
bool MergeChunkedResponse (std::istream& in, std::ostream& out)
|
|
{
|
|
std::string hexLen;
|
|
while (!in.eof ())
|
|
{
|
|
std::getline (in, hexLen);
|
|
errno = 0;
|
|
long int len = strtoul(hexLen.c_str(), (char **) NULL, 16);
|
|
if (errno != 0)
|
|
return false; /* conversion error */
|
|
if (len == 0)
|
|
return true; /* end of stream */
|
|
if (len < 0 || len > 10 * 1024 * 1024) /* < 10Mb */
|
|
return false; /* too large chunk */
|
|
char * buf = new char[len];
|
|
in.read (buf, len);
|
|
out.write (buf, len);
|
|
delete[] buf;
|
|
std::getline (in, hexLen); // read \r\n after chunk
|
|
}
|
|
return true;
|
|
}
|
|
|
|
std::string CreateBasicAuthorizationString (const std::string& user, const std::string& pass)
|
|
{
|
|
if (user.empty () && pass.empty ()) return "";
|
|
return "Basic " + i2p::data::ToBase64Standard (user + ":" + pass);
|
|
}
|
|
|
|
} // http
|
|
} // i2p
|