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// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <exceptions/exceptions.h>
#include <http/url.h>
#include <boost/lexical_cast.hpp>
#include <sstream>
#include <iostream>
namespace isc {
namespace http {
Url::Url(const std::string& url)
: url_(url), valid_(false), error_message_(), scheme_(Url::HTTPS),
hostname_(), port_(0), path_() {
parse();
}
bool
Url::operator<(const Url& url) const {
return (url_ < url.rawUrl());
}
Url::Scheme
Url::getScheme() const {
checkValid();
return (scheme_);
}
std::string
Url::getHostname() const {
checkValid();
return (hostname_);
}
std::string
Url::getStrippedHostname() const {
std::string hostname = getHostname();
if ((hostname.length() >= 2) && (hostname.at(0) == '[')) {
return (hostname.substr(1, hostname.length() - 2));
}
return (hostname);
}
unsigned
Url::getPort() const {
checkValid();
return (port_);
}
std::string
Url::getPath() const {
checkValid();
return (path_);
}
std::string
Url::toText() const {
std::ostringstream s;
s << (getScheme() == HTTP ? "http" : "https");
s << "://" << getHostname();
if (getPort() != 0) {
s << ":" << getPort();
}
s << getPath();
return (s.str());
}
void
Url::checkValid() const {
if (!isValid()) {
isc_throw(InvalidOperation, "invalid URL " << url_ << ": " << error_message_);
}
}
void
Url::parse() {
valid_ = false;
error_message_.clear();
scheme_ = Url::HTTPS;
hostname_.clear();
port_ = 0;
path_.clear();
std::ostringstream error;
// Retrieve scheme
size_t offset = url_.find(":");
if ((offset == 0) || (offset == std::string::npos)) {
error << "url " << url_ << " lacks http or https scheme";
error_message_ = error.str();
return;
}
// Validate scheme.
std::string scheme = url_.substr(0, offset);
if (scheme == "http") {
scheme_ = Url::HTTP;
} else if (scheme == "https") {
scheme_ = Url::HTTPS;
} else {
error << "invalid scheme " << scheme << " in " << url_;
error_message_ = error.str();
return;
}
// Colon and two slashes should follow the scheme
if (url_.substr(offset, 3) != "://") {
error << "expected :// after scheme in " << url_;
error_message_ = error.str();
return;
}
// Move forward to hostname.
offset += 3;
if (offset >= url_.length()) {
error << "hostname missing in " << url_;
error_message_ = error.str();
return;
}
size_t offset2 = 0;
// IPv6 address is specified within [ ].
if (url_.at(offset) == '[') {
offset2 = url_.find(']', offset);
if (offset2 == std::string::npos) {
error << "expected ] after IPv6 address in " << url_;
error_message_ = error.str();
return;
} else if (offset2 == offset + 1) {
error << "expected IPv6 address within [] in " << url_;
error_message_ = error.str();
return;
}
// Move one character beyond the ].
++offset2;
} else {
// There is a normal hostname or IPv4 address. It is terminated
// by the colon (for port number), a slash (if no port number) or
// goes up to the end of the URL.
offset2 = url_.find(":", offset);
if (offset2 == std::string::npos) {
offset2 = url_.find("/", offset);
if (offset2 == std::string::npos) {
// No port number and no slash.
offset2 = url_.length();
}
}
}
// Extract the hostname.
hostname_ = url_.substr(offset, offset2 - offset);
// If there is no port number and no path, simply return and mark the
// URL as valid.
if (offset2 == url_.length()) {
valid_ = true;
return;
}
// If there is a port number, we need to read it and convert to
// numeric value.
if (url_.at(offset2) == ':') {
if (offset2 == url_.length() - 1) {
error << "expected port number after : in " << url_;
error_message_ = error.str();
return;
}
// Move to the port number.
++offset2;
// Port number may be terminated by a slash or by the end of URL.
size_t slash_offset = url_.find('/', offset2);
std::string port_str;
if (slash_offset == std::string::npos) {
port_str = url_.substr(offset2);
} else {
port_str = url_.substr(offset2, slash_offset - offset2);
}
try {
// Try to convert the port number to numeric value.
port_ = boost::lexical_cast<unsigned>(port_str);
} catch (...) {
error << "invalid port number " << port_str << " in " << url_;
error_message_ = error.str();
return;
}
// Go to the end of the port section.
offset2 = slash_offset;
}
// If there is anything left in the URL, we consider it a path.
if (offset2 != std::string::npos) {
path_ = url_.substr(offset2);
if (path_.empty()) {
path_ = "/";
}
}
valid_ = true;
}
} // end of namespace isc::http
} // end of namespace isc
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