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/*
This file is part of libhttpserver
Copyright (C) 2011-2019 Sebastiano Merlino
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
*/
#include <ctype.h>
#include <algorithm>
#include <map>
#include <memory>
// Disabling lint error on regex (the only reason it errors is because the Chromium team prefers google/re2)
#include <regex> // NOLINT [build/c++11]
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
#include "httpserver/detail/http_endpoint.hpp"
#include "httpserver/http_utils.hpp"
using std::string;
using std::vector;
namespace httpserver {
namespace detail {
http_endpoint::~http_endpoint() {
}
void http_endpoint::normalize_url_complete() {
if (url_complete[url_complete.size() - 1] == '/') {
url_complete = url_complete.substr(0, url_complete.size() - 1);
}
if (url_complete[0] != '/') {
url_complete = "/" + url_complete;
}
}
void http_endpoint::append_non_registration_part(const string& part, bool& first) {
url_normalized += (first ? "" : "/") + part;
first = false;
url_pieces.push_back(part);
}
void http_endpoint::append_literal_url_part(const string& part, bool& first) {
if (first) {
// First piece: respect a leading '^' anchor verbatim by replacing
// (not appending to) url_normalized's seed prefix.
url_normalized = (part[0] == '^' ? "" : url_normalized) + part;
first = false;
} else {
url_normalized += "/" + part;
}
url_pieces.push_back(part);
}
void http_endpoint::append_parameter_url_part(const string& part,
unsigned int i, bool& first) {
if (part.size() < 3 || part[0] != '{' || part[part.size() - 1] != '}') {
throw std::invalid_argument("Bad URL format");
}
// {name} or {name|regex}: split on the optional '|'.
std::string::size_type bar = part.find_first_of('|');
const bool has_regex = bar != string::npos;
url_pars.push_back(part.substr(1, has_regex ? bar - 1 : part.size() - 2));
url_normalized += (first ? "" : "/")
+ (has_regex ? part.substr(bar + 1, part.size() - bar - 2) : "([^\\/]+)");
first = false;
chunk_positions.push_back(i);
url_pieces.push_back(part);
}
void http_endpoint::process_url_part(const vector<string>& parts,
unsigned int i, bool& first, bool registration) {
if (!registration) {
append_non_registration_part(parts[i], first);
return;
}
if (!parts[i].empty() && parts[i][0] != '{') {
append_literal_url_part(parts[i], first);
return;
}
append_parameter_url_part(parts[i], i, first);
}
void http_endpoint::compile_regex_url() {
url_normalized += "$";
try {
re_url_normalized = std::regex(url_normalized,
std::regex::extended | std::regex::icase | std::regex::nosubs);
} catch (std::regex_error& e) {
throw std::invalid_argument("Not a valid regex in URL: " + url_normalized);
}
reg_compiled = true;
}
http_endpoint::http_endpoint(const string& url, bool family, bool registration, bool use_regex):
family_url(family),
reg_compiled(false) {
if (use_regex && !registration) {
throw std::invalid_argument("Cannot use regex if not during registration");
}
url_normalized = use_regex ? "^/" : "/";
#ifdef CASE_INSENSITIVE
string_utilities::to_lower_copy(url, url_complete);
#else
url_complete = url;
#endif
normalize_url_complete();
auto parts = httpserver::http::http_utils::tokenize_url(url);
bool first = true;
for (unsigned int i = 0; i < parts.size(); i++) {
process_url_part(parts, i, first, registration);
}
if (use_regex) compile_regex_url();
}
http_endpoint::http_endpoint(const http_endpoint& h):
url_complete(h.url_complete),
url_normalized(h.url_normalized),
url_pars(h.url_pars),
url_pieces(h.url_pieces),
chunk_positions(h.chunk_positions),
re_url_normalized(h.re_url_normalized),
family_url(h.family_url),
reg_compiled(h.reg_compiled) {
}
http_endpoint& http_endpoint::operator =(const http_endpoint& h) {
url_complete = h.url_complete;
url_normalized = h.url_normalized;
family_url = h.family_url;
reg_compiled = h.reg_compiled;
re_url_normalized = h.re_url_normalized;
url_pars = h.url_pars;
url_pieces = h.url_pieces;
chunk_positions = h.chunk_positions;
return *this;
}
bool http_endpoint::operator <(const http_endpoint& b) const {
if (family_url != b.family_url) return family_url;
COMPARATOR(url_normalized, b.url_normalized, std::toupper);
}
bool http_endpoint::match(const http_endpoint& url) const {
if (!reg_compiled) throw std::invalid_argument("Cannot run match. Regex suppressed.");
// Family (prefix) rule: a family endpoint matches when the FIRST N
// request segments match the registered pattern, where N is the
// pattern's own segment count (url_pieces.size()). A request with
// fewer segments than the pattern can never satisfy that prefix
// rule, so it falls through to plain full-string matching below
// (which also handles every non-family endpoint).
if (!family_url || url.url_pieces.size() < url_pieces.size()) {
return regex_match(url.url_complete, re_url_normalized);
}
// Rebuild the request path truncated to the pattern's first N
// segments in `nn`, so the prefix can be regex-matched against
// re_url_normalized (which matches whole strings, not prefixes).
string nn = "/";
bool first = true;
for (unsigned int i = 0; i < url_pieces.size(); i++) {
nn += (first ? "" : "/") + url.url_pieces[i];
first = false;
}
return regex_match(nn, re_url_normalized);
}
} // namespace detail
} // namespace httpserver