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#include "UaParser.h"
#include <fstream>
#include <string>
#include <vector>
#include <unordered_set>
#include <boost/regex.hpp>
#include <glog/logging.h>
#include <yaml-cpp/yaml.h>
namespace {
struct DeviceStore {
std::string replacement;
boost::regex regExpr;
};
struct AgentStore : DeviceStore {
std::string majorVersionReplacement;
std::string minorVersionReplacement;
};
typedef AgentStore OsStore;
typedef AgentStore BrowserStore;
#define FILL_AGENT_STORE(node, agent_store, repl, maj_repl, min_repl) \
CHECK(node.Type() == YAML::NodeType::Map); \
for (auto it = node.begin(); it != node.end(); ++it) { \
const std::string key = it.first().to<std::string>(); \
const std::string value = it.second().to<std::string>(); \
if (key == "regex") { \
agent_store.regExpr = value; \
} else if (key == repl) { \
agent_store.replacement = value; \
} else if (key == maj_repl && !value.empty()) { \
agent_store.majorVersionReplacement = value; \
} else if (key == min_repl && !value.empty()) { \
try { \
agent_store.minorVersionReplacement = value; \
} catch (...) {} \
} else { \
CHECK(false); \
} \
}
struct UAStore {
explicit UAStore(const std::string& regexes_file_path) {
std::ifstream in_stream(regexes_file_path);
CHECK(in_stream.good());
YAML::Parser yaml_parser(in_stream);
YAML::Node regexes;
CHECK(yaml_parser.GetNextDocument(regexes));
const auto& user_agent_parsers = regexes["user_agent_parsers"];
for (const auto& user_agent : user_agent_parsers) {
BrowserStore browser;
FILL_AGENT_STORE(user_agent, browser, "family_replacement",
"v1_replacement", "v2_replacement");
browserStore.push_back(browser);
}
const auto& os_parsers = regexes["os_parsers"];
for (const auto& o : os_parsers) {
OsStore os;
FILL_AGENT_STORE(o, os, "os_replacement", "os_v1_replacement",
"os_v2_replacement");
osStore.push_back(os);
}
const auto& device_parsers = regexes["device_parsers"];
for (const auto& d : device_parsers) {
DeviceStore device;
for (auto it = d.begin(); it != d.end(); ++it) {
const std::string key = it.first().to<std::string>();
const std::string value = it.second().to<std::string>();
if (key == "regex") {
device.regExpr = value;
} else if (key == "device_replacement") {
device.replacement = value;
} else {
CHECK(false);
}
}
deviceStore.push_back(device);
}
}
std::vector<DeviceStore> deviceStore;
std::vector<OsStore> osStore;
std::vector<BrowserStore> browserStore;
};
template<class AGENT, class AGENT_STORE>
void fillAgent(AGENT& agent, const AGENT_STORE& store, const boost::smatch& m) {
CHECK(!m.empty());
if (m.size() > 1) {
agent.family = !store.replacement.empty()
? boost::regex_replace(store.replacement, boost::regex("\\$1"), m[1].str())
: m[1];
} else {
agent.family = !store.replacement.empty()
? boost::regex_replace(store.replacement, boost::regex("\\$1"), m[0].str())
: m[0];
}
if (!store.majorVersionReplacement.empty()) {
agent.major = store.majorVersionReplacement;
} else if (m.size() > 2) {
const auto s = m[2].str();
if (!s.empty()) {
agent.major = s;
}
}
if (!store.minorVersionReplacement.empty()) {
agent.minor = store.minorVersionReplacement;
} else if (m.size() > 3) {
const auto s = m[3].str();
if (!s.empty()) {
agent.minor = s;
}
}
if (m.size() > 4) {
const auto s = m[4].str();
if (!s.empty()) {
agent.patch = s;
}
}
}
UserAgent parseImpl(const std::string& ua, const UAStore* ua_store) {
UserAgent uagent;
for (const auto& b : ua_store->browserStore) {
auto& browser = uagent.browser;
boost::smatch m;
if (boost::regex_search(ua, m, b.regExpr)) {
fillAgent(browser, b, m);
break;
} else {
browser.family = "Other";
}
}
for (const auto& o : ua_store->osStore) {
auto& os = uagent.os;
boost::smatch m;
if (boost::regex_search(ua, m, o.regExpr)) {
fillAgent(os, o, m);
break;
} else {
os.family = "Other";
}
}
for (const auto& d : ua_store->deviceStore) {
auto& device = uagent.device;
boost::smatch m;
if (boost::regex_search(ua, m, d.regExpr)) {
if (m.size() > 1) {
device.family = !d.replacement.empty()
? boost::regex_replace(d.replacement, boost::regex("\\$1"), m[1].str())
: m[1].str();
} else if (m.size() == 1) {
device.family = !d.replacement.empty()
? boost::regex_replace(d.replacement, boost::regex("\\$1"), m[0].str())
: m[0].str();
}
break;
} else {
device.family = "Other";
}
}
return uagent;
}
} // namespace
UserAgentParser::UserAgentParser(const std::string& regexes_file_path)
: regexes_file_path_ { regexes_file_path } {
ua_store_ = new UAStore(regexes_file_path);
}
UserAgentParser::~UserAgentParser() {
delete static_cast<const UAStore*>(ua_store_);
}
UserAgent UserAgentParser::parse(const std::string& ua) const {
return parseImpl(ua, static_cast<const UAStore*>(ua_store_));
}
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