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#include <configparser.h>
#include <tagsouppullparser.h>
#include <exceptions.h>
#include <utils.h>
#include <logger.h>
#include <fstream>
#include <config.h>
#include <cstdlib>
#include <cstring>
#include <sys/types.h>
#include <pwd.h>
#include <cstring>
#include <cstdlib>
namespace newsbeuter {
configparser::configparser() {
register_handler("include", this);
}
configparser::~configparser() { }
void configparser::handle_action(const std::string& action, const std::vector<std::string>& params) {
/*
* configparser also acts as config_action_handler to implement to recursive "include" command.
*/
if (action == "include") {
if (params.size() < 1) {
throw confighandlerexception(AHS_TOO_FEW_PARAMS);
}
if (!this->parse(utils::resolve_tilde(params[0])))
throw confighandlerexception(AHS_FILENOTFOUND);
} else
throw confighandlerexception(AHS_INVALID_COMMAND);
}
bool configparser::parse(const std::string& filename, bool double_include) {
/*
* this function parses a config file.
*
* First, it checks whether this file has already been included, and if not,
* it does the following:
* - open the file
* - read if line by line
* - tokenize every line
* - if there is at least one token, look up a registered config_action_handler to handle to command (which is specified in the first token)
* - hand over the tokenize results to the config_action_handler
* - if an error happens, react accordingly.
*/
if (!double_include && included_files.find(filename) != included_files.end()) {
LOG(LOG_WARN, "configparser::parse: file %s has already been included", filename.c_str());
return true;
}
included_files.insert(included_files.begin(), filename);
unsigned int linecounter = 1;
std::ifstream f(filename.c_str());
std::string line;
getline(f,line);
if (!f.is_open()) {
LOG(LOG_WARN, "configparser::parse: file %s couldn't be opened", filename.c_str());
return false;
}
while (f.is_open() && !f.eof()) {
LOG(LOG_DEBUG,"configparser::parse: tokenizing %s",line.c_str());
std::vector<std::string> tokens = utils::tokenize_quoted(line);
if (!tokens.empty()) {
std::string cmd = tokens[0];
config_action_handler * handler = action_handlers[cmd];
if (handler) {
tokens.erase(tokens.begin()); // delete first element
try {
evaluate_backticks(tokens);
handler->handle_action(cmd,tokens);
} catch (const confighandlerexception& e) {
throw configexception(utils::strprintf(_("Error while processing command `%s' (%s line %u): %s"), line.c_str(), filename.c_str(), linecounter, e.what()));
}
} else {
throw configexception(utils::strprintf(_("unknown command `%s'"), cmd.c_str()));
}
}
getline(f,line);
++linecounter;
}
return true;
}
void configparser::register_handler(const std::string& cmd, config_action_handler * handler) {
action_handlers[cmd] = handler;
}
void configparser::unregister_handler(const std::string& cmd) {
action_handlers[cmd] = 0;
}
void configparser::evaluate_backticks(std::vector<std::string>& tokens) {
for (std::vector<std::string>::iterator it=tokens.begin();it!=tokens.end();++it) {
*it = evaluate_backticks(*it);
}
}
std::string configparser::evaluate_backticks(std::string token) {
std::string::size_type pos1 = token.find_first_of("`", 0);
std::string::size_type pos2 = 0;
while (pos1 != std::string::npos && pos2 != std::string::npos) {
pos2 = token.find_first_of("`", pos1+1);
if (pos2 != std::string::npos) {
std::string cmd = token.substr(pos1+1, pos2-pos1-1);
token.erase(pos1, pos2-pos1+1);
std::string result = utils::get_command_output(cmd);
utils::trim_end(result);
token.insert(pos1, result);
pos1 = token.find_first_of("`", pos1+result.length()+1);
}
}
return token;
}
}
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