Merge pull request #129 from skweeker/lotw_web_import

Lotw web import

.gitignore

@@ -1,2 +1,3 @@
 /application/config/database.php
 /application/config/config.php
+/uploads/*.adi

application/config/config.sample.php

@@ -60,7 +60,7 @@ $config['auth_level'][99] = "Administrator";
 |--------------------------------------------------------------------------
 |
 |  'username'    QRZ.com Username
-|  'password'    Default locator used to calculate bearings/distance
+|  'password'    QRZ.com Password
 */
 
 $config['qrz_username'] = "";

application/config/migration.php

@@ -0,0 +1,41 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+/*
+|--------------------------------------------------------------------------
+| Enable/Disable Migrations
+|--------------------------------------------------------------------------
+|
+| Migrations are disabled by default but should be enabled 
+| whenever you intend to do a schema migration.
+|
+*/
+$config['migration_enabled'] = TRUE;
+
+
+/*
+|--------------------------------------------------------------------------
+| Migrations version
+|--------------------------------------------------------------------------
+|
+| This is used to set migration version that the file system should be on.
+| If you run $this->migration->latest() this is the version that schema will
+| be upgraded / downgraded to.
+|
+*/
+$config['migration_version'] = 2;
+
+
+/*
+|--------------------------------------------------------------------------
+| Migrations Path
+|--------------------------------------------------------------------------
+|
+| Path to your migrations folder.
+| Typically, it will be within your application path.
+| Also, writing permission is required within the migrations path.
+|
+*/
+$config['migration_path'] = APPPATH . 'migrations/';
+
+
+/* End of file migration.php */
+/* Location: ./application/config/migration.php */

application/controllers/dashboard.php

@@ -11,7 +11,10 @@ class Dashboard extends CI_Controller {
 
 	public function index()
 	{
-	
+		// Check our version and run any migrations
+		$this->load->library('Migration');
+		$this->migration->current();	
+		
 		// Database connections
 		$this->load->model('logbook_model');
 		$this->load->model('user_model');
@@ -162,4 +165,4 @@ class Dashboard extends CI_Controller {
 
 	}
 	
-}
+}

application/controllers/lotw.php

@@ -11,95 +11,160 @@ class Lotw extends CI_Controller {
 		$this->load->model('user_model');
 		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }
 	}
+	
+	private function loadFromFile($filepath)
+	{
+		// 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();
+
+		$table = "<table>";
+
+		while($record = $this->adif_parser->get_record())
+		{
+			if(count($record) == 0)
+			{
+				break;
+			};
+
+	
+
+			//echo date('Y-m-d', strtotime($record['qso_date']))."<br>";
+			//echo date('H:m', strtotime($record['time_on']))."<br>";
+
+			//$this->logbook_model->import($record);
+
+			//echo $record["call"]."<br>";
+			//print_r($record->);
+	
+			$time_on = date('Y-m-d', strtotime($record['qso_date'])) ." ".date('H:i', strtotime($record['time_on']));
+	
+			$qsl_date = date('Y-m-d', strtotime($record['qslrdate'])) ." ".date('H:i', strtotime($record['qslrdate']));
+
+			if (isset($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']);
+			$lotw_status = $this->logbook_model->lotw_update($time_on, $record['call'], $record['band'], $qsl_date, $record['qsl_rcvd']);
+	
+			$table .= "<tr>";
+				$table .= "<td>".$time_on."</td>";
+				$table .= "<td>".$record['call']."</td>";
+				$table .= "<td>".$record['mode']."</td>";
+				$table .= "<td>".$record['qsl_rcvd']."</td>";
+				$table .= "<td>".$qsl_date."</td>";
+				$table .= "<td>QSO Record: ".$status."</td>";
+				$table .= "<td>LoTW Record: ".$lotw_status."</td>";
+			$table .= "<tr>";
+		};
+
+		$table .= "</table>";
+
+		unlink($filepath);
+
+		$data['lotw_table'] = $table;
+
+		$data['page_title'] = "LoTW ADIF Information";
+		$this->load->view('layout/header', $data);
+		$this->load->view('lotw/analysis');
+		$this->load->view('layout/footer');
+	}
 
 	public function import() {	
 		$data['page_title'] = "LoTW ADIF Import";
 
 		$config['upload_path'] = './uploads/';
 		$config['allowed_types'] = 'adi|ADI';
-
+		
 		$this->load->library('upload', $config);
-
+		
-		if ( ! $this->upload->do_upload())
+		$this->load->model('logbook_model');
-		{
+		
-			$data['error'] = $this->upload->display_errors();
+		if ($this->input->post('lotwimport') == 'fetch')
-
+		{			
-			$this->load->view('layout/header', $data);
+			$file = $config['upload_path'] . 'lotwreport_download.adi';
-			$this->load->view('lotw/import');
+			
-			$this->load->view('layout/footer');
+			// Get credentials for LoTW
+			$query = $this->user_model->get_by_id($this->session->userdata('user_id'));
+    		$q = $query->row();
+    		$data['user_lotw_name'] = $q->user_lotw_name;
+			$data['user_lotw_password'] = $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('dashboard');
+			}
+			
+			// Query the logbook to determine when the last LoTW confirmation was
+			$lotw_last_qsl_date = $this->logbook_model->lotw_last_qsl_date();
+						
+			// TODO: Consolidate code
+			// TODO: Specifiy in config file whether we want LoTW confirms as V or Y. Both are acceptable under ADIF specification. HRD seems to use V. Everyone else that I've used uses Y.
+			
+			// Build URL for LoTW report file
+			$lotw_url .= "?";
+			$lotw_url .= "login=" . $data['user_lotw_name'];
+			$lotw_url .= "&password=" . $data['user_lotw_password'];
+			$lotw_url .= "&qso_query=1&qso_qsl='yes'";
+			
+			//TODO: Option to specifiy whether we download location data from LoTW or not
+			//$lotw_url .= "&qso_qsldetail=\"yes\";
+			
+			$lotw_url .= "&qso_qslsince=";
+			$lotw_url .= "$lotw_last_qsl_date";
+			
+			// Only pull back entries that belong to this callsign
+			$lotw_call = $this->session->userdata('user_callsign');
+			$lotw_url .= "&qso_owncall=$lotw_call";
+			
+			file_put_contents($file, file_get_contents($lotw_url));
+			
+			ini_set('memory_limit', '-1');
+			$this->loadFromFile($file);
 		}
 		else
 		{
-
+			if ( ! $this->upload->do_upload())
-			$data = array('upload_data' => $this->upload->data());
-
-			ini_set('memory_limit', '-1');
-			set_time_limit(0);
-
-			$this->load->model('logbook_model');
-
-			$this->load->library('adif_parser');
-
-			$this->adif_parser->load_from_file('./uploads/'.$data['upload_data']['file_name']);
-
-			$this->adif_parser->initialize();
-
-			$table = "<table>";
-			
-			while($record = $this->adif_parser->get_record())
 			{
-				if(count($record) == 0)
-				{
-					break;
-				};
-
-				
-
-				//echo date('Y-m-d', strtotime($record['qso_date']))."<br>";
-				//echo date('H:m', strtotime($record['time_on']))."<br>";
-
-				//$this->logbook_model->import($record);
-
-				//echo $record["call"]."<br>";
-				//print_r($record->);
-				
-				$time_on = date('Y-m-d', strtotime($record['qso_date'])) ." ".date('H:i', strtotime($record['time_on']));
-				
-				$qsl_date = date('Y-m-d', strtotime($record['qslrdate'])) ." ".date('H:i', strtotime($record['qslrdate']));
-
-				if (isset($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']));  
-				}
-				
-				$status = $this->logbook_model->import_check($time_on, $record['call'], $record['band']);
-				$lotw_status = $this->logbook_model->lotw_update($time_on, $record['call'], $record['band'], $qsl_date, $record['qsl_rcvd']);
-				
-				$table .= "<tr>";
-					$table .= "<td>".$time_on."</td>";
-					$table .= "<td>".$record['call']."</td>";
-					$table .= "<td>".$record['mode']."</td>";
-					$table .= "<td>".$record['qsl_rcvd']."</td>";
-					$table .= "<td>".$qsl_date."</td>";
-					$table .= "<td>QSO Record: ".$status."</td>";
-					$table .= "<td>LoTW Record: ".$lotw_status."</td>";
-				$table .= "<tr>";
-			};
 			
-			$table .= "</table>";
+				$data['error'] = $this->upload->display_errors();
-
-			unlink('./uploads/'.$data['upload_data']['file_name']);
-
-			$data['lotw_table'] = $table;
-			
-			$data['page_title'] = "LoTW ADIF Information";
-			$this->load->view('layout/header', $data);
-			$this->load->view('lotw/analysis');
-			$this->load->view('layout/footer');
 
+				$this->load->view('layout/header', $data);
+				$this->load->view('lotw/import');
+				$this->load->view('layout/footer');
+			}
+			else
+			{
+				$data = array('upload_data' => $this->upload->data());
+		
+				$this->loadFromFile('./uploads/'.$data['upload_data']['file_name']);
+			}
 		}
-	}
+	} // end function
-
+} // end class
-
-}

application/controllers/migrate.php

@@ -0,0 +1,12 @@
+<? class Migrate extends CI_Controller {
+
+  public function index()
+  {
+    $this->load->library('Migration');
+
+    if ( ! $this->migration->current()) {
+      show_error($this->migration->error_string());
+    }
+  }
+
+} ?>

application/controllers/user.php

@@ -190,6 +190,18 @@ class User extends CI_Controller {
 				$data['user_timezone'] = $q->user_timezone;
 			}
 
+			if($this->input->post('user_lotw_name')) {
+				$data['user_lotw_name'] = $this->input->post('user_lotw_name');
+			} else {
+				$data['user_lotw_name'] = $q->user_lotw_name;
+			}
+			
+			if($this->input->post('user_lotw_password')) {
+				$data['user_lotw_password'] = $this->input->post('user_lotw_password');
+			} else {
+				$data['user_lotw_password'] = $q->user_lotw_password;
+			}
+			
 			$this->load->view('user/edit', $data);
 			$this->load->view('layout/footer');
 		}

application/migrations/001_Create_accounts.php

@@ -1,32 +0,0 @@
-<?php defined('BASEPATH') OR exit('No direct script access allowed');
-
-class Migration_Create_accounts extends	CI_Migration {
-	
-	function up() 
-	{	
-		if ( ! $this->db->table_exists('accounts'))
-		{
-			// Setup Keys
-			$this->dbforge->add_key('id', TRUE);
-			
-			$this->dbforge->add_field(array(
-				'id' => array('type' => 'INT', 'constraint' => 5, 'unsigned' => TRUE, 'auto_increment' => TRUE),
-				'company_name' => array('type' => 'VARCHAR', 'constraint' => '200', 'null' => FALSE),
-				'first_name' => array('type' => 'VARCHAR', 'constraint' => '200', 'null' => FALSE),
-				'last_name' => array('type' => 'VARCHAR', 'constraint' => '200', 'null' => FALSE),
-				'phone' => array('type' => 'TEXT', 'null' => FALSE),
-				'email' => array('type' => 'TEXT', 'null' => FALSE),
-				'address' => array('type' => 'TEXT', 'null' => FALSE),
-				'Last_Update' => array('type' => 'DATETIME', 'null' => FALSE)
-			));
-			
-			$this->dbforge->add_field("Created_At TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP");
-			$this->dbforge->create_table('accounts', TRUE);
-		}
-	}
-
-	function down() 
-	{
-		$this->dbforge->drop_table('accounts');
-	}
-}

application/migrations/001_add_lotw_credentials.php

@@ -0,0 +1,21 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+
+class Migration_add_lotw_credentials extends CI_Migration {
+
+	public function up()
+	{
+		$fields = array(
+      			'user_lotw_name VARCHAR(32) DEFAULT NULL',
+      			'user_lotw_password VARCHAR(64) DEFAULT NULL'
+    		);
+		
+    		$this->dbforge->add_column('users', $fields);
+	}
+
+	public function down()
+	{
+		$this->dbforge->drop_column('users', 'user_lotw_name');
+    		$this->dbforge->drop_column('users', 'user_lotw_password');
+	}
+}
+?>

application/migrations/002_add_config_table.php

@@ -0,0 +1,41 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+
+class Migration_add_config_table extends CI_Migration {
+
+        public function up()
+        {
+				$this->dbforge->add_field('id');
+				
+                $this->dbforge->add_field(array(
+                        'lotw_download_url' => array(
+                                'type' => 'VARCHAR',
+                                'constraint' => 255,
+                        ),
+                        'lotw_upload_url' => array(
+                                'type' => 'VARCHAR',
+                                'constraint' => 255,
+                        ),
+                       'lotw_rcvd_mark' => array(
+                                'type' => 'VARCHAR',
+                                'constraint' => 1,
+                        ),
+                ));
+				
+				
+                $this->dbforge->create_table('config');
+				
+				$data = array(
+   					'lotw_download_url' => 'https://p1k.arrl.org/lotwuser/lotwreport.adi',
+   					'lotw_upload_url' => 'https://p1k.arrl.org/lotwuser/upload',
+   					'lotw_rcvd_mark' => 'Y'
+				);
+
+				$this->db->insert('config', $data); 
+        }
+
+        public function down()
+        {
+                $this->dbforge->drop_table('config');
+        }
+}
+?>

application/models/logbook_model.php

@@ -585,6 +585,18 @@ class Logbook_model extends CI_Model {
 		
 		return "Updated";
 	}
+	
+	function lotw_last_qsl_date() {
+    	$this->db->select('COL_LOTW_QSLRDATE');
+    	$this->db->where('COL_LOTW_QSLRDATE IS NOT NULL');
+   		$this->db->order_by("COL_LOTW_QSLRDATE", "desc");
+    	$this->db->limit(1);
+    	
+    	$query = $this->db->get($this->config->item('table_name'));
+    	$row = $query->row();
+    
+   		return $row->COL_LOTW_QSLRDATE;
+  	}
 
     function import($record) {
         // Join date+time

application/models/user_model.php

@@ -121,7 +121,9 @@ class User_Model extends CI_Model {
 					'user_locator' => $fields['user_locator'],
 					'user_firstname' => $fields['user_firstname'],
 					'user_lastname' => $fields['user_lastname'],
-					'user_timezone' => $fields['user_timezone']
+					'user_timezone' => $fields['user_timezone'],
+					'user_lotw_name' => $fields['user_lotw_name'],
+					'user_lotw_password' => $fields['user_lotw_password']
 				);
 	
 				// Check to see if the user is allowed to change user levels

application/views/lotw/import.php

@@ -1,17 +1,24 @@
 <div id="container">
 <h2><?php echo $page_title; ?></h2>
 
-<p>Upload the Exported ADIF file from LoTW from the <a href="https://p1k.arrl.org/lotwuser/qsos?qsoscmd=adif" target="_blank">Download Report</a> Area, to mark QSOs as confirmed on LOTW.</p>
-
-<p><span class="label important">Important</span> Log files must have the file type .adi</p>
-
 <?php echo form_open_multipart('lotw/import');?>
-
+<table>
-<input type="file" name="userfile" size="20" />
+	<tr>
-
+		<td><input type="radio" name="lotwimport" id="upload" value="upload" checked <?=set_radio('lotwimport','upload') ?> /> Upload a file</td>
-<br /><br />
+		<td>
-
+			<p>Upload the Exported ADIF file from LoTW from the <a href="https://p1k.arrl.org/lotwuser/qsos?qsoscmd=adif" target="_blank">Download Report</a> Area, to mark QSOs as confirmed on LOTW.</p>
-<input class="btn primary" type="submit" value="Upload" />
+			<p><span class="label important">Important</span> Log files must have the file type .adi</p>
+			<input type="file" name="userfile" size="20" />
+		</td>
+	</tr>
+	<tr>
+		<td><input type="radio" name="lotwimport" id="fetch" value="fetch" <?=set_radio('lotwimport','fetch') ?> /> Pull LoTW data for me</td>
+		<td>
+			<p>Cloudlog will use the LoTW username an password stored in your user profile to download a report from LoTW for you. The report Cloudlog downloads will have all confirmations since your last LoTW confirmation, up until now.</p>
+		</td>
+	</tr>
+</table>
+<input class="btn primary" type="submit" value="Import" />
 
 </form>
 

application/views/qso/edit.php

@@ -159,8 +159,8 @@
 					<option value="N" <?php if($COL_QSL_RCVD == "N") { echo "selected=\"selected\""; } ?>>No</option>
 					<option value="Y" <?php if($COL_QSL_RCVD == "Y") { echo "selected=\"selected\""; } ?>>Yes</option>
 					<option value="R" <?php if($COL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Requested</option>
-					<option value="Q" <?php if($COL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
+					<option value="Q" <?php if($COL_QSL_RCVD == "I") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
-					<option value="I" <?php if($COL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
+					<option value="I" <?php if($COL_QSL_RCVD == "V") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
 				</select></td>
 			</tr>
 			<tr>
@@ -203,8 +203,8 @@
 						<option value="N" <?php if($COL_EQSL_QSL_RCVD == "N") { echo "selected=\"selected\""; } ?>>No</option>
 						<option value="Y" <?php if($COL_EQSL_QSL_RCVD == "Y") { echo "selected=\"selected\""; } ?>>Yes</option>
 						<option value="R" <?php if($COL_EQSL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Requested</option>
-						<option value="Q" <?php if($COL_EQSL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
+						<option value="I" <?php if($COL_EQSL_QSL_RCVD == "I") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
-						<option value="I" <?php if($COL_EQSL_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
+						<option value="V" <?php if($COL_EQSL_QSL_RCVD == "V") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
 					</select></td>
 				</tr>
 			</table>
@@ -225,8 +225,8 @@
 						<option value="N" <?php if($COL_LOTW_QSL_RCVD == "N") { echo "selected=\"selected\""; } ?>>No</option>
 						<option value="Y" <?php if($COL_LOTW_QSL_RCVD == "Y") { echo "selected=\"selected\""; } ?>>Yes</option>
 						<option value="R" <?php if($COL_LOTW_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Requested</option>
-						<option value="Q" <?php if($COL_LOTW_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
+						<option value="I" <?php if($COL_LOTW_QSL_RCVD == "I") { echo "selected=\"selected\""; } ?>>Invalid (Ignore)</option>
-						<option value="I" <?php if($COL_LOTW_QSL_RCVD == "R") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
+						<option value="V" <?php if($COL_LOTW_QSL_RCVD == "V") { echo "selected=\"selected\""; } ?>>Verified (Match)</option>
 					</select></td>
 				</tr>
 			</table>

application/views/user/edit.php

@@ -85,6 +85,20 @@ $this->load->helper('form');
 		<td><?php echo form_dropdown('user_timezone', $timezones, $user_timezone); ?></td>
 	</tr>
 
+	<tr>
+		<td>Logbook of The World (LoTW) Username</td>
+		<td><input type="text" name="user_lotw_name" value="<?php if(isset($user_lotw_name)) { echo $user_lotw_name; } ?>" />
+		<?php if(isset($userlotwname_error)) { echo "<div class=\"small error\">".$userlotwname_error."</div>"; } ?>
+		</td>
+	</tr>
+	
+	<tr>
+		<td>Logbook of The World (LoTW) Password</td>
+		<td><input type="password" name="user_lotw_password" />
+		<?php if(isset($lotwpassword_error)) { echo "<div class=\"small error\">".$lotwpassword_error."</div>"; } else { ?>
+		<div class="small">Leave blank to keep existing password</div></td>
+		<?php } ?>
+	</tr>
 	
 </table>	
 <input type="hidden" name="id" value="<?php echo $this->uri->segment(3); ?>" />

install/assets/install.sql

@@ -3815,6 +3815,8 @@ CREATE TABLE IF NOT EXISTS `users` (
   `user_locator` varchar(255) NOT NULL,
   `user_firstname` varchar(255) NOT NULL,
   `user_lastname` varchar(255) NOT NULL,
+  `user_lotw_name` varchar(32) NULL COMMENT 'LoTW Username',
+  `user_lotw_password` varchar(64) NULL COMMENT 'LoTW Password',
   PRIMARY KEY (`user_id`),
   UNIQUE KEY `user_name` (`user_name`),
   UNIQUE KEY `user_email` (`user_email`)

system/language/english/migration_lang.php

@@ -0,0 +1,13 @@
+<?php
+
+$lang['migration_none_found']			= "No migrations were found.";
+$lang['migration_not_found']			= "This migration could not be found.";
+$lang['migration_multiple_version']		= "This are multiple migrations with the same version number: %d.";
+$lang['migration_class_doesnt_exist']	= "The migration class \"%s\" could not be found.";
+$lang['migration_missing_up_method']	= "The migration class \"%s\" is missing an 'up' method.";
+$lang['migration_missing_down_method']	= "The migration class \"%s\" is missing an 'down' method.";
+$lang['migration_invalid_filename']		= "Migration \"%s\" has an invalid filename.";
+
+
+/* End of file migration_lang.php */
+/* Location: ./system/language/english/migration_lang.php */

system/libraries/Migration.php

@@ -0,0 +1,328 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2006 - 2012, EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @link		http://codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Migration Class
+ *
+ * All migrations should implement this, forces up() and down() and gives
+ * access to the CI super-global.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Libraries
+ * @author		Reactor Engineers
+ * @link
+ */
+class CI_Migration {
+
+	protected $_migration_enabled = FALSE;
+	protected $_migration_path = NULL;
+	protected $_migration_version = 0;
+
+	protected $_error_string = '';
+
+	public function __construct($config = array())
+	{
+		# Only run this constructor on main library load
+		if (get_parent_class($this) !== FALSE)
+		{
+			return;
+		}
+
+		foreach ($config as $key => $val)
+		{
+			$this->{'_' . $key} = $val;
+		}
+
+		log_message('debug', 'Migrations class initialized');
+
+		// Are they trying to use migrations while it is disabled?
+		if ($this->_migration_enabled !== TRUE)
+		{
+			show_error('Migrations has been loaded but is disabled or set up incorrectly.');
+		}
+
+		// If not set, set it
+		$this->_migration_path == '' AND $this->_migration_path = APPPATH . 'migrations/';
+
+		// Add trailing slash if not set
+		$this->_migration_path = rtrim($this->_migration_path, '/').'/';
+
+		// Load migration language
+		$this->lang->load('migration');
+
+		// They'll probably be using dbforge
+		$this->load->dbforge();
+
+		// If the migrations table is missing, make it
+		if ( ! $this->db->table_exists('migrations'))
+		{
+			$this->dbforge->add_field(array(
+				'version' => array('type' => 'INT', 'constraint' => 3),
+			));
+
+			$this->dbforge->create_table('migrations', TRUE);
+
+			$this->db->insert('migrations', array('version' => 0));
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Migrate to a schema version
+	 *
+	 * Calls each migration step required to get to the schema version of
+	 * choice
+	 *
+	 * @param	int	Target schema version
+	 * @return	mixed	TRUE if already latest, FALSE if failed, int if upgraded
+	 */
+	public function version($target_version)
+	{
+		$start = $current_version = $this->_get_version();
+		$stop = $target_version;
+
+		if ($target_version > $current_version)
+		{
+			// Moving Up
+			++$start;
+			++$stop;
+			$step = 1;
+		}
+		else
+		{
+			// Moving Down
+			$step = -1;
+		}
+
+		$method = ($step === 1) ? 'up' : 'down';
+		$migrations = array();
+
+		// We now prepare to actually DO the migrations
+		// But first let's make sure that everything is the way it should be
+		for ($i = $start; $i != $stop; $i += $step)
+		{
+			$f = glob(sprintf($this->_migration_path . '%03d_*.php', $i));
+
+			// Only one migration per step is permitted
+			if (count($f) > 1)
+			{
+				$this->_error_string = sprintf($this->lang->line('migration_multiple_version'), $i);
+				return FALSE;
+			}
+
+			// Migration step not found
+			if (count($f) == 0)
+			{
+				// If trying to migrate up to a version greater than the last
+				// existing one, migrate to the last one.
+				if ($step == 1)
+				{
+					break;
+				}
+
+				// If trying to migrate down but we're missing a step,
+				// something must definitely be wrong.
+				$this->_error_string = sprintf($this->lang->line('migration_not_found'), $i);
+				return FALSE;
+			}
+
+			$file = basename($f[0]);
+			$name = basename($f[0], '.php');
+
+			// Filename validations
+			if (preg_match('/^\d{3}_(\w+)$/', $name, $match))
+			{
+				$match[1] = strtolower($match[1]);
+
+				// Cannot repeat a migration at different steps
+				if (in_array($match[1], $migrations))
+				{
+					$this->_error_string = sprintf($this->lang->line('migration_multiple_version'), $match[1]);
+					return FALSE;
+				}
+
+				include $f[0];
+				$class = 'Migration_' . ucfirst($match[1]);
+
+				if ( ! class_exists($class))
+				{
+					$this->_error_string = sprintf($this->lang->line('migration_class_doesnt_exist'), $class);
+					return FALSE;
+				}
+
+				if ( ! is_callable(array($class, $method)))
+				{
+					$this->_error_string = sprintf($this->lang->line('migration_missing_'.$method.'_method'), $class);
+					return FALSE;
+				}
+
+				$migrations[] = $match[1];
+			}
+			else
+			{
+				$this->_error_string = sprintf($this->lang->line('migration_invalid_filename'), $file);
+				return FALSE;
+			}
+		}
+
+		log_message('debug', 'Current migration: ' . $current_version);
+
+		$version = $i + ($step == 1 ? -1 : 0);
+
+		// If there is nothing to do so quit
+		if ($migrations === array())
+		{
+			return TRUE;
+		}
+
+		log_message('debug', 'Migrating from ' . $method . ' to version ' . $version);
+
+		// Loop through the migrations
+		foreach ($migrations AS $migration)
+		{
+			// Run the migration class
+			$class = 'Migration_' . ucfirst(strtolower($migration));
+			call_user_func(array(new $class, $method));
+
+			$current_version += $step;
+			$this->_update_version($current_version);
+		}
+
+		log_message('debug', 'Finished migrating to '.$current_version);
+
+		return $current_version;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Set's the schema to the latest migration
+	 *
+	 * @return	mixed	true if already latest, false if failed, int if upgraded
+	 */
+	public function latest()
+	{
+		if ( ! $migrations = $this->find_migrations())
+		{
+			$this->_error_string = $this->line->lang('migration_none_found');
+			return false;
+		}
+
+		$last_migration = basename(end($migrations));
+
+		// Calculate the last migration step from existing migration
+		// filenames and procceed to the standard version migration
+		return $this->version((int) substr($last_migration, 0, 3));
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Set's the schema to the migration version set in config
+	 *
+	 * @return	mixed	true if already current, false if failed, int if upgraded
+	 */
+	public function current()
+	{
+		return $this->version($this->_migration_version);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Error string
+	 *
+	 * @return	string	Error message returned as a string
+	 */
+	public function error_string()
+	{
+		return $this->_error_string;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Set's the schema to the latest migration
+	 *
+	 * @return	mixed	true if already latest, false if failed, int if upgraded
+	 */
+	protected function find_migrations()
+	{
+		// Load all *_*.php files in the migrations path
+		$files = glob($this->_migration_path . '*_*.php');
+		$file_count = count($files);
+
+		for ($i = 0; $i < $file_count; $i++)
+		{
+			// Mark wrongly formatted files as false for later filtering
+			$name = basename($files[$i], '.php');
+			if ( ! preg_match('/^\d{3}_(\w+)$/', $name))
+			{
+				$files[$i] = FALSE;
+			}
+		}
+
+		sort($files);
+		return $files;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Retrieves current schema version
+	 *
+	 * @return	int	Current Migration
+	 */
+	protected function _get_version()
+	{
+		$row = $this->db->get('migrations')->row();
+		return $row ? $row->version : 0;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Stores the current schema version
+	 *
+	 * @param	int	Migration reached
+	 * @return	bool
+	 */
+	protected function _update_version($migrations)
+	{
+		return $this->db->update('migrations', array(
+			'version' => $migrations
+		));
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Enable the use of CI super-global
+	 *
+	 * @param	mixed	$var
+	 * @return	mixed
+	 */
+	public function __get($var)
+	{
+		return get_instance()->$var;
+	}
+}
+
+/* End of file Migration.php */
+/* Location: ./system/libraries/Migration.php */