<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Lotw extends CI_Controller {
 /*
	|--------------------------------------------------------------------------
	| Controller: Lotw
	|--------------------------------------------------------------------------
	|
	| This Controller handles all things LoTW, upload and download.
	|
	|
	|	Note:
	|	If you plan on using any of the code within this class please credit
	| 	Peter, 2M0SQL. A lot of hard work went into building the
	|	signing of files.
	|
	|	Big Thanks to Rodrigo PY2RAF for all the help and information about OpenSSL
	|
	*/

	/* Controls who can access the controller and its functions */
	function __construct()
	{
		parent::__construct();
		$this->load->helper(array('form', 'url'));

		// Load language files
		$this->lang->load('lotw');

		if (ENVIRONMENT == 'maintenance' && $this->session->userdata('user_id') == '') {
            echo "Maintenance Mode is active. Try again later.\n";
			redirect('user/login');
		}
	}

	/*
	|--------------------------------------------------------------------------
	| Function: index
	|--------------------------------------------------------------------------
	|
	| Default function for the controller which loads when doing /lotw
	| this shows all the uploaded lotw p12 certificates the user has uploaded
	|
	*/
	public function index() {
		$this->load->library('Permissions');
		$this->load->model('user_model');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

		// Fire OpenSSL missing error if not found
		if (!extension_loaded('openssl')) {
			echo "You must install php OpenSSL for LoTW functions to work";
		}

		// Load required models for page generation
		$this->load->model('LotwCert');

		// Get Array of the logged in users LoTW certs.
		$data['lotw_cert_results'] = $this->LotwCert->lotw_certs($this->session->userdata('user_id'));

		// Set Page Title
		$data['page_title'] = "Logbook of the World";

		// Check folder permissions
		$uploads_folder = $this->permissions->is_really_writable('uploads');
		$data['uploads_folder'] = $uploads_folder;

		// Load Views
		$this->load->view('interface_assets/header', $data);
		$this->load->view('lotw_views/index');
		$this->load->view('interface_assets/footer');
	}

	/*
	|--------------------------------------------------------------------------
	| Function: cert_upload
	|--------------------------------------------------------------------------
	|
	| Nothing fancy just shows the cert_upload form for uploading p12 files
	|
	*/
	public function cert_upload() {
		$this->load->model('user_model');
		$this->load->model('dxcc');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

		// Load DXCC Countrys List
		$data['dxcc_list'] = $this->dxcc->list();

		// Set Page Title
		$data['page_title'] = "Logbook of the World";

		// Load Views
		$this->load->view('interface_assets/header', $data);
		$this->load->view('lotw_views/upload_cert', array('error' => ' ' ));
		$this->load->view('interface_assets/footer');
	}

	/*
	|--------------------------------------------------------------------------
	| Function: do_cert_upload
	|--------------------------------------------------------------------------
	|
	| do_cert_upload is called from cert_upload form submit and handles uploading
	| and processing of p12 files and storing the data into mysql
	|
	*/
	public function do_cert_upload()
    {
		$this->load->model('user_model');
		$this->load->model('dxcc');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

		// Fire OpenSSL missing error if not found
		if (!extension_loaded('openssl')) {
			echo "You must install php OpenSSL for LoTW functions to work";
		}

    	// create folder to store certs while processing
    	if (!file_exists('./uploads/lotw/certs')) {
		    mkdir('./uploads/lotw/certs', 0755, true);
		}

		$config['upload_path']          = './uploads/lotw/certs';
    	$config['allowed_types']        = 'p12';

		$this->load->library('upload', $config);

        if ( ! $this->upload->do_upload('userfile'))
        {
        	// Upload of P12 Failed
            $error = array('error' => $this->upload->display_errors());

			// Load DXCC Countrys List
			$data['dxcc_list'] = $this->dxcc->list();

			// Set Page Title
			$data['page_title'] = "Logbook of the World";

			// Load Views
			$this->load->view('interface_assets/header', $data);
			$this->load->view('lotw_views/upload_cert', $error);
			$this->load->view('interface_assets/footer');
        }
        else
        {
        	// Load database queries
        	$this->load->model('LotwCert');

        	//Upload of P12 successful
        	$data = array('upload_data' => $this->upload->data());

        	$info = $this->decrypt_key($data['upload_data']['full_path']);

			// Check to see if certificate is already in the system
			$new_certificate = $this->LotwCert->find_cert($info['issued_callsign'], $info['dxcc-id'], $this->session->userdata('user_id'));

        	if($new_certificate == 0) {
        		// New Certificate Store in Database

        		// Store Certificate Data into MySQL
        		$this->LotwCert->store_certificate($this->session->userdata('user_id'), $info['issued_callsign'], $info['dxcc-id'], $info['validFrom'], $info['validTo_Date'], $info['qso-first-date'], $info['qso-end-date'], $info['pem_key'], $info['general_cert']);

        		// Cert success flash message
        		$this->session->set_flashdata('Success', $info['issued_callsign'].' Certificate Imported.');
        	} else {
        		// Certificate is in the system time to update

				$this->LotwCert->update_certificate($this->session->userdata('user_id'), $info['issued_callsign'], $info['dxcc-id'], $info['validFrom'], $info['validTo_Date'], $info['qso-first-date'], $info['qso-end-date'], $info['pem_key'], $info['general_cert']);

        		// Cert success flash message
        		$this->session->set_flashdata('Success', $info['issued_callsign'].' Certificate Updated.');

        	}

        	// p12 certificate processed time to delete the file
        	unlink($data['upload_data']['full_path']);

	        redirect('lotw');
        }
    }

    /*
	|--------------------------------------------------------------------------
	| Function: lotw_upload
	|--------------------------------------------------------------------------
	|
	| This function Uploads to LoTW
	|
	*/
	public function lotw_upload() {

		$this->load->model('user_model');
		$this->user_model->authorize(2);

		// Fire OpenSSL missing error if not found
		if (!extension_loaded('openssl')) {
			echo "You must install php OpenSSL for LoTW functions to work";
		}

		// set the last run in cron table for the correct cron id
		$this->load->model('cron_model');
		$this->cron_model->set_last_run($this->router->class.'_'.$this->router->method);

		// Get Station Profile Data
		$this->load->model('Stations');

		if ($this->user_model->authorize(2)) {
			if (!($this->config->item('disable_manual_lotw'))) {
				$station_profiles = $this->Stations->all_of_user($this->session->userdata('user_id'));
				$sync_user_id=$this->session->userdata('user_id');
			} else {
				echo "Manual syncing is disabled by configuration";
				redirect('dashboard');
				exit();
			}
		} else {
			$station_profiles = $this->Stations->all();
			$sync_user_id=null;
		}

		// Array of QSO IDs being Uploaded

		$qso_id_array = array();

		// Build TQ8 Outputs
		if ($station_profiles->num_rows() >= 1) {

			foreach ($station_profiles->result() as $station_profile) {

				// Get Certificate Data
				$this->load->model('LotwCert');
				$data['station_profile'] = $station_profile;
				$data['lotw_cert_info'] = $this->LotwCert->lotw_cert_details($station_profile->station_callsign, $station_profile->station_dxcc);

				// If Station Profile has no LoTW Cert continue on.
				if(!isset($data['lotw_cert_info']->cert_dxcc_id)) {
					continue;
				}

				// Check if LoTW certificate itself is valid
				// Validty of QSO dates will be checked later
				$current_date = date('Y-m-d H:i:s');
				if ($current_date <= $data['lotw_cert_info']->date_created) {
					echo $data['lotw_cert_info']->callsign.": LoTW certificate not valid yet!";
					continue;
				}
				if ($current_date >= $data['lotw_cert_info']->date_expires) {
					echo $data['lotw_cert_info']->callsign.": LoTW certificate expired!";
					continue;
				}

				// Get QSOs

				$this->load->model('Logbook_model');

				$data['qsos'] = $this->Logbook_model->get_lotw_qsos_to_upload($data['station_profile']->station_id, $data['lotw_cert_info']->qso_start_date, $data['lotw_cert_info']->qso_end_date);

				// Nothing to upload
				if(empty($data['qsos']->result())){
					if ($this->user_model->authorize(2)) {	// Only be verbose if we have a session
						echo $station_profile->station_callsign." (".$station_profile->station_profile_name."): No QSOs to upload.<br>";
					}
					continue;
				}

				foreach ($data['qsos']->result() as $temp_qso) {
					array_push($qso_id_array, $temp_qso->COL_PRIMARY_KEY);
				}

				// Build File to save
				$adif_to_save = $this->load->view('lotw_views/adif_views/adif_export', $data, TRUE);
				if (strpos($adif_to_save, '<SIGN_LOTW_V2.0:1:6>')) {
					// Signing failed
					echo "Signing failed.";
					continue;
				}

				// create folder to store upload file
				if (!file_exists('./uploads/lotw')) {
					mkdir('./uploads/lotw', 0775, true);
				}

				// Build Filename
				$filename_for_saving = './uploads/lotw/'.preg_replace('/[^a-z0-9]+/', '-', strtolower($data['lotw_cert_info']->callsign))."-".date("Y-m-d-H-i-s")."-wavelog.tq8";

				$gzdata = gzencode($adif_to_save, 9);
				$fp = fopen($filename_for_saving, "w");
				fwrite($fp, $gzdata);
				fclose($fp);

				//The URL that accepts the file upload.
				$url = 'https://lotw.arrl.org/lotw/upload';

				//The name of the field for the uploaded file.
				$uploadFieldName = 'upfile';

				//The full path to the file that you want to upload
				$filePath = realpath($filename_for_saving);

				//Initiate cURL
				$ch = curl_init();

				//Set the URL
				curl_setopt($ch, CURLOPT_URL, $url);

				//Set the HTTP request to POST
				curl_setopt($ch, CURLOPT_POST, true);

				//Tell cURL to return the output as a string.
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

				//Use the recommended way, creating a CURLFile object.
				$uploadfile = curl_file_create($filePath);
				$uploadfile->setPostFilename(basename($filePath));

				//Setup our POST fields
				$postFields = array(
					$uploadFieldName => $uploadfile
				);

				curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
				curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);

				//Execute the request
				$result = curl_exec($ch);

				if(curl_errno($ch)){
					echo $station_profile->station_callsign." (".$station_profile->station_profile_name."): Upload Failed - ".curl_strerror(curl_errno($ch))." (".curl_errno($ch).")<br>";
					$this->LotwCert->last_upload($data['lotw_cert_info']->lotw_cert_id, "Upload failed");
					if (curl_errno($ch) == 28) {  // break on timeout
						echo "Timeout reached. Stopping subsequent uploads.<br>";
						break;
					} else {
						continue;
					}
				}

				$pos = strpos($result, "<!-- .UPL.  accepted -->");

				if ($pos === false) {
					// Upload of TQ8 Failed for unknown reason
					echo $station_profile->station_callsign." (".$station_profile->station_profile_name."): Upload Failed - ".curl_strerror(curl_errno($ch))." (".curl_errno($ch).")<br>";
					$this->LotwCert->last_upload($data['lotw_cert_info']->lotw_cert_id, "Upload failed");
					if (curl_errno($ch) == 28) {  // break on timeout
						echo "Timeout reached. Stopping subsequent uploads.<br>";
						break;
					} else {
						continue;
					}
				} else {
					// Upload of TQ8 was successfull

					echo $station_profile->station_callsign." (".$station_profile->station_profile_name."): Upload Successful - ".$filename_for_saving."<br>";

					$this->LotwCert->last_upload($data['lotw_cert_info']->lotw_cert_id, "Success");

					// Mark QSOs as Sent
					foreach ($qso_id_array as $qso_number) {
						$this->Logbook_model->mark_lotw_sent($qso_number);
					}
				}

				// Delete TQ8 File - This is done regardless of whether upload was succcessful
				unlink(realpath($filename_for_saving));
			}
		} else {
			echo "No Station Profiles found to upload to LoTW";
		}

			/*
			|	Download QSO Matches from LoTW
			*/
		if ($this->user_model->authorize(2)) {
			echo "<br><br>";
			$sync_user_id=$this->session->userdata('user_id');
		} else {
			$sync_user_id=null;
		}
		echo $this->lotw_download($sync_user_id);
	}

	/*
	|--------------------------------------------------------------------------
	| Function: delete_cert
	|--------------------------------------------------------------------------
	|
	| Deletes LoTW certificate from the MySQL table
	|
	*/
    public function delete_cert($cert_id) {
    	$this->load->model('user_model');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

    	$this->load->model('LotwCert');

    	$this->LotwCert->delete_certificate($this->session->userdata('user_id'), $cert_id);

    	$this->session->set_flashdata('Success', 'Certificate Deleted.');

    	redirect('/lotw/');
    }


	/*
	|--------------------------------------------------------------------------
	| Function: decrypt_key
	|--------------------------------------------------------------------------
	|
	| Accepts p12 file and optional password and encrypts the file returning
	| the required fields for LoTW and the PEM Key
	|
	*/
	public function decrypt_key($file, $password = "") {
		$this->load->model('user_model');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

		$results = array();
		$password = $password; // Only needed if 12 has a password set
		$filename = file_get_contents('file://'.$file);
		$worked = openssl_pkcs12_read($filename, $results, $password);

		$data['general_cert'] = $results['cert'];


		if($worked) {
			// Reading p12 successful
			$new_password = "wavelog"; // set default password
			$result = null;
			$worked = openssl_pkey_export($results['pkey'], $result, $new_password);

			if($worked) {
				// Store PEM Key in Array
			    $data['pem_key'] = $result;
			} else {
				// Error Log Error Message
			    log_message('error', openssl_error_string());

			    // Set warning message redirect to LoTW main page
			    $this->session->set_flashdata('Warning', openssl_error_string());
				redirect('/lotw/');
			}
		} else {
			// Reading p12 failed log error message
			log_message('error', openssl_error_string());

			// Set warning message redirect to LoTW main page
			$this->session->set_flashdata('Warning', openssl_error_string());
			redirect('/lotw/');
		}

		// Read Cert Data
		$certdata= openssl_x509_parse($results['cert'],0);

		// Store Variables
		$data['issued_callsign'] = $certdata['subject']['undefined'];
		$data['issued_name'] = $certdata['subject']['commonName'];
		$data['validFrom'] = date('Y-m-d H:i:s', $certdata['validFrom_time_t']);
		$data['validTo_Date'] = date('Y-m-d H:i:s', $certdata['validTo_time_t']);
		// https://oidref.com/1.3.6.1.4.1.12348.1
		$data['qso-first-date'] = $certdata['extensions']['1.3.6.1.4.1.12348.1.2'];
		$data['qso-end-date'] = $certdata['extensions']['1.3.6.1.4.1.12348.1.3'];
		$data['dxcc-id'] = $certdata['extensions']['1.3.6.1.4.1.12348.1.4'];

		return $data;
	}

	/*
	|--------------------------------------------------------------------------
	| Function: loadFromFile
	|--------------------------------------------------------------------------
	|
	|	$filepath is the ADIF file, $display_view is used to hide the output if its internal script
	|
	|	Internal function that takes the LoTW ADIF and imports into the log
	|
	*/
	private function loadFromFile($filepath, $display_view = "TRUE")
	{

		// Figure out how we should be marking QSLs confirmed via LoTW
		$query = $query = $this->db->query('SELECT lotw_rcvd_mark FROM config');
		$q = $query->row();
		$config['lotw_rcvd_mark'] = $q->lotw_rcvd_mark;

		ini_set('memory_limit', '-1');
		set_time_limit(0);

		$this->load->library('adif_parser');

		$this->adif_parser->load_from_file($filepath);

		$this->adif_parser->initialize();

		$tableheaders = "<table width=\"100%\">";
			$tableheaders .= "<tr class=\"titles\">";
				$tableheaders .= "<td>Station Callsign</td>";
				$tableheaders .= "<td>QSO Date</td>";
				$tableheaders .= "<td>Call</td>";
				$tableheaders .= "<td>Mode</td>";
				$tableheaders .= "<td>LoTW QSL Received</td>";
				$tableheaders .= "<td>Date LoTW Confirmed</td>";
				$tableheaders .= "<td>State</td>";
				$tableheaders .= "<td>Gridsquare</td>";
				$tableheaders .= "<td>IOTA</td>";
				$tableheaders .= "<td>Log Status</td>";
				$tableheaders .= "<td>LoTW Status</td>";
			$tableheaders .= "</tr>";

			$table = "";
			while($record = $this->adif_parser->get_record()) {
				// Check for LoTW confirmation in ADIF record and skip if not existent
				if (!isset($record['app_lotw_rxqsl'])) {
					continue;
				}

				$time_on = date('Y-m-d', strtotime($record['qso_date'])) ." ".date('H:i', strtotime($record['time_on']));

				$qsl_date = date('Y-m-d H:i', strtotime($record['app_lotw_rxqsl']));

				if (isset($record['time_off'])) {
					$time_off = date('Y-m-d', strtotime($record['qso_date'])) ." ".date('H:i', strtotime($record['time_off']));
				} else {
				   $time_off = date('Y-m-d', strtotime($record['qso_date'])) ." ".date('H:i', strtotime($record['time_on']));
				}

				// If we have a positive match from LoTW, record it in the DB according to the user's preferences
				if ($record['qsl_rcvd'] == "Y")
				{
					$record['qsl_rcvd'] = $config['lotw_rcvd_mark'];
				}

				$status = $this->logbook_model->import_check($time_on, $record['call'], $record['band'], $record['mode'], $record['station_callsign']);

				if($status[0] == "Found") {
					$qso_id4lotw=$status[1];
					if (isset($record['state'])) {
						$state = $record['state'];
					} else {
						$state = "";
					}
					// Present only if the QSLing station specified a single valid grid square value in its station location uploaded to LoTW.
					$qsl_gridsquare = "";
					if (isset($record['gridsquare'])) {
						if (strlen($record['gridsquare']) > strlen($status[2]) || substr(strtoupper($status[2]), 0, 4) != substr(strtoupper($record['gridsquare']), 0, 4)) {
							$qsl_gridsquare = $record['gridsquare'];
						}
					}

					if (isset($record['vucc_grids'])) {
						$qsl_vucc_grids = $record['vucc_grids'];
					} else {
						$qsl_vucc_grids = "";
					}

					if (isset($record['iota'])) {
						$iota = $record['iota'];
					} else {
						$iota = "";
					}

					if (isset($record['cnty'])) {
						$cnty = $record['cnty'];
					} else {
						$cnty = "";
					}

					if (isset($record['cqz'])) {
						$cqz = $record['cqz'];
					} else {
						$cqz = "";
					}

					if (isset($record['ituz'])) {
						$ituz = $record['ituz'];
					} else {
						$ituz = "";
					}

					$lotw_status = $this->logbook_model->lotw_update($time_on, $record['call'], $record['band'], $qsl_date, $record['qsl_rcvd'], $state, $qsl_gridsquare, $qsl_vucc_grids, $iota, $cnty, $cqz, $ituz, $record['station_callsign'],$qso_id4lotw);

					$table .= "<tr>";
						$table .= "<td>".$record['station_callsign']."</td>";
						$table .= "<td>".$time_on."</td>";
						$table .= "<td>".$record['call']."</td>";
						$table .= "<td>".$record['mode']."</td>";
						$table .= "<td>".$record['qsl_rcvd']."</td>";
						$table .= "<td>".$qsl_date."</td>";
						$table .= "<td>".$state."</td>";
						$table .= "<td>".($qsl_gridsquare != '' ? $qsl_gridsquare : $qsl_vucc_grids)."</td>";
						$table .= "<td>".$iota."</td>";
						$table .= "<td>QSO Record: ".$status[0]."</td>";
						$table .= "<td>LoTW Record: ".$lotw_status."</td>";
					$table .= "</tr>";
				} else {
					$table .= "<tr>";
						$table .= "<td>".$record['station_callsign']."</td>";
						$table .= "<td>".$time_on."</td>";
						$table .= "<td>".$record['call']."</td>";
						$table .= "<td>".$record['mode']."</td>";
						$table .= "<td>".$record['qsl_rcvd']."</td>";
						$table .= "<td></td>";
						$table .= "<td></td>";
						$table .= "<td></td>";
						$table .= "<td></td>";
						$table .= "<td>QSO Record: ".$status[0]."</td>";
						$table .= "<td></td>";
					$table .= "</tr>";
				}
			}

			if ($table != "")
			{
				$table .= "</table>";
				$data['lotw_table_headers'] = $tableheaders;
				$data['lotw_table'] = $table;
		}

		unlink($filepath);

		$this->load->model('user_model');
		if ($this->user_model->authorize(2)) {	// Only Output results if authorized User
			if(isset($data['lotw_table_headers'])) {
				if($display_view == TRUE) {
					$data['page_title'] = "LoTW ADIF Information";
					$this->load->view('interface_assets/header', $data);
					$this->load->view('lotw/analysis');
					$this->load->view('interface_assets/footer');
				} else {
					return $tableheaders.$table;
				}
			} else {
				echo "Downloaded LoTW report contains no matches.";
			}
		}
	}

	/*
	|--------------------------------------------------------------------------
	| Function: lotw_download
	|--------------------------------------------------------------------------
	|
	|	Collects users with LoTW usernames and passwords and runs through them
	|	downloading matching QSOs.
	|
	*/
	function lotw_download($sync_user_id = null) {
		$this->load->model('user_model');
		$this->load->model('logbook_model');

		$query = $this->user_model->get_all_lotw_users();

		if ($query->num_rows() >= 1) {
			$result = '';

			// Get URL for downloading LoTW
			$url_query = $this->db->query('SELECT lotw_download_url FROM config');
			$q = $url_query->row();
			$lotw_base_url = $q->lotw_download_url;

			foreach ($query->result() as $user) {
				if ( ($sync_user_id != null) && ($sync_user_id != $user->user_id) ) { continue; }

				// Validate that LoTW credentials are not empty
				// TODO: We don't actually see the error message
				if ($user->user_lotw_password == '') {
					$result = "You have not defined your ARRL LoTW credentials!";
					continue;
				}

				$config['upload_path'] = './uploads/';
				$file = $config['upload_path'] . 'lotwreport_download.adi';
				if (file_exists($file) && ! is_writable($file)) {
					$result = "Temporary download file ".$file." is not writable. Aborting!";
					continue;
				}

				// Get credentials for LoTW
		    	$data['user_lotw_name'] = urlencode($user->user_lotw_name);
				$data['user_lotw_password'] = urlencode($user->user_lotw_password);

				$lotw_last_qsl_date = date('Y-m-d', strtotime($this->logbook_model->lotw_last_qsl_date($user->user_id)));

				// Build URL for LoTW report file
				$lotw_url = $lotw_base_url."?";
				$lotw_url .= "login=" . $data['user_lotw_name'];
				$lotw_url .= "&password=" . $data['user_lotw_password'];
				$lotw_url .= "&qso_query=1&qso_qsl='yes'&qso_qsldetail='yes'&qso_mydetail='yes'";

				$lotw_url .= "&qso_qslsince=";
				$lotw_url .= "$lotw_last_qsl_date";

				if (! is_writable(dirname($file))) {
					$result = "Temporary download directory ".dirname($file)." is not writable. Aborting!";
					continue;
				}
				$ch = curl_init();
				curl_setopt($ch, CURLOPT_URL, $lotw_url);
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
				curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
				$content = curl_exec($ch);
				if(curl_errno($ch)){
					$result = "LoTW download failed for user ".$data['user_lotw_name'].": ".curl_strerror(curl_errno($ch))." (".curl_errno($ch).").";
					if (curl_errno($ch) == 28) {  // break on timeout
						$result .= "<br>Timeout reached. Stopping subsequent downloads.";
						break;
					}
				}
				file_put_contents($file, $content);
				if (file_get_contents($file, false, null, 0, 39) != "ARRL Logbook of the World Status Report") {
					$result = "Downloaded LoTW report for user ".$data['user_lotw_name']." is invalid. Check your credentials.";
					continue;
				}

				ini_set('memory_limit', '-1');
				$result = $this->loadFromFile($file, false);
			}
			return $result;
		} else {
			return "No LoTW User details found to carry out matches.";
		}
	}

	public function import() {	// Is only called via frontend. Cron uses "upload". within download the download is called
		$this->load->model('user_model');
		if(!$this->user_model->authorize(2)) {
			$this->session->set_flashdata('notice', 'You\'re not allowed to do that!');
			redirect('dashboard');
			exit();
		}

		if (!($this->config->item('disable_manual_lotw'))) {
			$data['page_title'] = "LoTW ADIF Import";

			$config['upload_path'] = './uploads/';
			$config['allowed_types'] = 'adi|ADI';

			$this->load->library('upload', $config);

			$this->load->model('logbook_model');

			if ($this->input->post('lotwimport') == 'fetch') {
				$file = $config['upload_path'] . 'lotwreport_download.adi';

				// Get credentials for LoTW
				$query = $this->user_model->get_by_id($this->session->userdata('user_id'));
				$q = $query->row();
				$data['user_lotw_name'] = urlencode($q->user_lotw_name ?? '');
				$data['user_lotw_password'] = urlencode($q->user_lotw_password ?? '');

				// Get URL for downloading LoTW
				$query = $query = $this->db->query('SELECT lotw_download_url FROM config');
				$q = $query->row();
				$lotw_url = $q->lotw_download_url;

				// Validate that LoTW credentials are not empty
				// TODO: We don't actually see the error message
				if ($data['user_lotw_name'] == '' || $data['user_lotw_password'] == '')
				{
					$this->session->set_flashdata('warning', 'You have not defined your ARRL LoTW credentials!'); redirect('lotw/import');
				}

				$customDate = $this->input->post('from');

				if ($customDate != NULL) {
					$lotw_last_qsl_date = date($customDate);
				}
				else {
					// Query the logbook to determine when the last LoTW confirmation was
					$lotw_last_qsl_date = date('Y-m-d', strtotime($this->logbook_model->lotw_last_qsl_date($this->session->userdata['user_id'])));
				}

				// Build URL for LoTW report file
				$lotw_url .= "?";
				$lotw_url .= "login=" . $data['user_lotw_name'];
				$lotw_url .= "&password=" . $data['user_lotw_password'];
				$lotw_url .= "&qso_query=1&qso_qsl='yes'&qso_qsldetail='yes'&qso_mydetail='yes'";

				$lotw_url .= "&qso_qslsince=";
				$lotw_url .= "$lotw_last_qsl_date";

				if ($this->input->post('callsign') != '0') {
					$lotw_url .= "&qso_owncall=".$this->input->post('callsign');
				}

				if (is_writable(dirname($file)) && (!file_exists($file) || is_writable($file))) {
					$ch = curl_init();
					curl_setopt($ch, CURLOPT_URL, $lotw_url);
					curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
					curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
					$content = curl_exec($ch);
					if(!curl_errno($ch)){
						file_put_contents($file, $content);

						ini_set('memory_limit', '-1');
						$this->loadFromFile($file);
					} else {
						print "LoTW download failed for user ".$data['user_lotw_name'].": ".curl_strerror(curl_errno($ch))." (".curl_errno($ch).").";
					}
				} else {
					if (!is_writable(dirname($file))) {
						$data['errormsg'] = 'Directory '.dirname($file).' is not writable!';
					} else if (!is_writable($file)) {
						$data['errormsg'] = 'File '.$file.' is not writable!';
					}
					$this->load->model('Stations');
					$data['callsigns'] = $this->Stations->callsigns_of_user($this->session->userdata('user_id'));

					$this->load->view('interface_assets/header', $data);
					$this->load->view('lotw/import', $data);
					$this->load->view('interface_assets/footer');
				}
			}
			else
			{
				if ( ! $this->upload->do_upload())
				{

					$data['error'] = $this->upload->display_errors();
					$this->load->model('Stations');
					$data['callsigns'] = $this->Stations->callsigns_of_user($this->session->userdata('user_id'));

					$this->load->view('interface_assets/header', $data);
					$this->load->view('lotw/import', $data);
					$this->load->view('interface_assets/footer');
				}
				else
				{
					$data = array('upload_data' => $this->upload->data());

					$this->loadFromFile('./uploads/'.$data['upload_data']['file_name']);
				}
			}
		} else {
			$this->session->set_flashdata('notice', 'You\'re not allowed to do that!');
			redirect('dashboard');
			exit();
		}
	} // end function

	public function export() {
		$this->load->model('user_model');
		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }

		$data['page_title'] = "LoTW .TQ8 Upload";

		$config['upload_path'] = './uploads/';
		$config['allowed_types'] = 'tq8|TQ8';

		$this->load->library('upload', $config);

		if ( ! $this->upload->do_upload())
		{
			$data['error'] = $this->upload->display_errors();

			$this->load->view('interface_assets/header', $data);
			$this->load->view('lotw/export');
			$this->load->view('interface_assets/footer');
		}
		else
		{
			$data = array('upload_data' => $this->upload->data());

			// Figure out how we should be marking QSLs confirmed via LoTW
			$query = $query = $this->db->query('SELECT lotw_login_url FROM config');
			$q = $query->row();
			$config['lotw_login_url'] = $q->lotw_login_url;

			// Set some fields that we're going to need for ARRL login
			$query = $this->user_model->get_by_id($this->session->userdata('user_id'));
    		$q = $query->row();
    		$fields['login'] = $q->user_lotw_name;
			$fields['password'] = $q->user_lotw_password;
			$fields['acct_sel'] = "";

			if ($fields['login'] == '' || $fields['password'] == '')
			{
				$this->session->set_flashdata('warning', 'You have not defined your ARRL LoTW credentials!'); redirect('lotw/status');
			}

			// Curl stuff goes here

			// First we need to get a cookie

			// options
			$cookie_file_path = "./uploads/cookies.txt";
			$agent            = "Mozilla/4.0 (compatible;)";

			// begin script
			$ch = curl_init();

			// extra headers
			$headers[] = "Accept: */*";
			$headers[] = "Connection: Keep-Alive";

			// basic curl options for all requests
			curl_setopt($ch, CURLOPT_HTTPHEADER,  $headers);
			curl_setopt($ch, CURLOPT_HEADER,  0);

			// TODO: These SSL things should probably be set to true :)
			curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_USERAGENT, $agent);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
			curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file_path);
			curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file_path);

			// Set login URL
			curl_setopt($ch, CURLOPT_URL, $config['lotw_login_url']);

			// set postfields using what we extracted from the form
			$POSTFIELDS = http_build_query($fields);

			// set post options
			curl_setopt($ch, CURLOPT_POST, 1);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $POSTFIELDS);

			// perform login
			$result = curl_exec($ch);
			if (stristr($result, "Username/password incorrect"))
			{
			   $this->session->set_flashdata('warning', 'Your ARRL username and/or password is incorrect.'); redirect('lotw/status');
			}


			// Now we need to use that cookie and upload the file
			// change URL to upload destination URL
			curl_setopt($ch, CURLOPT_URL, $config['lotw_login_url']);

			// Grab the file
			$postfile = array(
        		"upfile"=>"@./uploads/".$data['upload_data']['file_name'],
    		);

    		//Upload it
    		curl_setopt($ch, CURLOPT_POSTFIELDS, $postfile);
    		$response = curl_exec($ch);
			if (stristr($response, "accepted"))
			{
			   $this->session->set_flashdata('lotw_status', 'accepted');
			   $data['page_title'] = "LoTW .TQ8 Sent";
			}
			elseif (stristr($response, "rejected"))
			{
					$this->session->set_flashdata('lotw_status', 'rejected');
					$data['page_title'] = "LoTW .TQ8 Sent";
			}
			else
			{
				// If we're here, we didn't find what we're looking for in the ARRL response
				// and LoTW is probably down or broken.
				$this->session->set_flashdata('warning', 'Did not receive proper response from LoTW. Try again later.');
				$data['page_title'] = "LoTW .TQ8 Not Sent";
			}

			// Now we need to clean up
			unlink($cookie_file_path);
			unlink('./uploads/'.$data['upload_data']['file_name']);

			$this->load->view('interface_assets/header', $data);
			$this->load->view('lotw/status');
			$this->load->view('interface_assets/footer');
		}
	}

	/*
		Load the ARRL LoTW User Activity CSV and saves into uploads/lotw_users.csv
	*/
	public function load_users() {
		$contents = file_get_contents('https://lotw.arrl.org/lotw-user-activity.csv', true);

        if($contents === FALSE) {
            echo "Something went wrong with fetching the LoTW users file.";
        } else {
            $file = './updates/lotw_users.csv';

            if (file_put_contents($file, $contents) !== FALSE) {     // Save our content to the file.
                echo "LoTW User Data Saved.";
            } else {
                echo "FAILED: Could not write to LoTW users file";
            }
        }
	}

	/*
		Check if callsign is an active LoTW user and return whether its true or not
	*/
	function lotw_usercheck($callsign) {
		$f = fopen('./updates/lotw_users.csv', "r");
		$result = false;
		while ($row = fgetcsv($f)) {
		    if ($row[0] == strtoupper($callsign)) {
			$result = $row[0];
			echo "Found";
			break;
		    } else {
			echo "Not Found";
			break;
		    }
		}
		fclose($f);
	}

	function signlog($sign_key, $string) {

		$qso_string = $string;

		$key = $sign_key;

		$pkeyid = openssl_pkey_get_private($key, 'wavelog');
		if ($pkeyid) {
			//openssl_sign($plaintext, $signature, $pkeyid, OPENSSL_ALGO_SHA1 );
			//openssl_free_key($pkeyid);

			if(openssl_sign($qso_string, $signature, $pkeyid, OPENSSL_ALGO_SHA1)) {
				if (defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION < 8) {
					openssl_free_key($pkeyid);
				}
				$signature_b64 = base64_encode($signature);
				return $signature_b64."\n";
			}
		} else {
			log_message('error', 'Error signing LoTW log.');
			return null;
		}


	}

	/*
	|	Function: lotw_satellite_map
	|	Requires: OSCAR Satellite name $satname
	|
	|	Outputs if LoTW uses a different satellite name
	|
	*/
	function lotw_satellite_map($satname) {
		$arr = array(
			"ARISS"		=>	"ISS",
			"UKUBE1"	=>	"UKUBE-1",
			"KEDR"		=>	"ARISSAT-1",
			"TO-108"	=>	"CAS-6",
			"TAURUS"	=>	"TAURUS-1",
			"AISAT1"	=>	"AISAT-1",
			'UVSQ'		=>	"UVSQ-SAT",
			'CAS-3H'	=>	"LILACSAT-2",
			'IO-117'	=>	"GREENCUBE",
			"TEVEL1"	=>	"TEVEL-1",
			"TEVEL2"	=>	"TEVEL-2",
			"TEVEL3"	=>	"TEVEL-3",
			"TEVEL4"	=>	"TEVEL-4",
			"TEVEL5"	=>	"TEVEL-5",
			"TEVEL6"	=>	"TEVEL-6",
			"TEVEL7"	=>	"TEVEL-7",
			"TEVEL8"	=>	"TEVEL-8",
			"INSPR7"	=> "INSPIRE-SAT 7",
		);

		return array_search(strtoupper($satname),$arr,true);
	}

	/*
	|	Function: lotw_ca_province_map
	|	Requires: candian province map $ca_province
	*/
	function lotw_ca_province_map($ca_prov) {
		switch ($ca_prov):
			case "QC":
				return "PQ";
				break;
			case "NL":
				return "NF";
				break;
			default:
				return $ca_prov;
		endswitch;
	}

	/*
	|	Function: mode_map
	|	Requires: mode as $mode, submode as $submode
	|
	|	This converts ADIF modes to the mode that LoTW expects if its non standard
	*/
	function mode_map($mode, $submode) {
		switch ($mode):
			case "PKT":
				return "PACKET";
				break;
			case "MFSK":
				if ($submode == "FT4") {
					return "FT4";
					break;
				} elseif ($submode == "FST4") {
					return "FST4";
					break;
				} elseif ($submode == "MFSK16") {
					return "MFSK16";
					break;
				} elseif ($submode == "MFSK8") {
					return "MFSK8";
					break;
				} elseif ($submode == "Q65") {
					return "Q65";
					break;
				} else {
					return "DATA";
					break;
				}
			case "PSK":
				if ($submode == "PSK31") {
					return "PSK31";
					break;
				} elseif ($submode == "PSK63") {
					return "PSK63";
					break;
				} elseif ($submode == "BPSK125") {
					return "PSK125";
					break;
				} elseif ($submode == "BPSK31") {
					return "PSK31";
					break;
				} elseif ($submode == "BPSK63") {
					return "PSK63";
					break;
				} elseif ($submode == "FSK31") {
					return "FSK31";
					break;
				} elseif ($submode == "PSK10") {
					return "PSK10";
					break;
				} elseif ($submode == "PSK125") {
					return "PSK125";
					break;
				} elseif ($submode == "PSK500") {
					return "PSK500";
					break;
				} elseif ($submode == "PSK63F") {
					return "PSK63F";
					break;
				} elseif ($submode == "PSKAM10") {
					return "PSKAM";
					break;
				} elseif ($submode == "PSKAM31") {
					return "PSKAM";
					break;
				} elseif ($submode == "PSKAM50") {
					return "PSKAM";
					break;
				} elseif ($submode == "PSKFEC31") {
					return "PSKFEC31";
					break;
				} elseif ($submode == "QPSK125") {
					return "PSK125";
					break;
				} elseif ($submode == "QPSK31") {
					return "PSK31";
					break;
				} elseif ($submode == "QPSK63") {
					return "PSK63";
					break;
				} elseif ($submode == "PSK2K") {
					return "PSK2K";
					break;
				} else {
					return "DATA";
					break;
				}
			default:
				return $mode;
		endswitch;
	}

} // end class
