- adding an update check mechanism: once a day, piwik will check against api.piwik.org to check if a new piwik release is available. If a new release is available, the top right orange message will display: "Piwik 0.2.30 is available! Please update now (see changes)." with link to piwik.org/docs/update and piwik.org/changelog

- adding helper function to send http request with enforced timeout (to make sure that the piwik UI doesn't hang for 30 seconds when checking for a new release once a day, if piwik.org down)
- adding some installation strings that weren't in the translation file already
- adding two checkboxes during installation: register to piwik major & security releases newsletter, register for general piwik newsletter.

git-svn-id: http://dev.piwik.org/svn/trunk@909 59fd770c-687e-43c8-a1e3-f5a4ff64c105

1 files changed, 49 insertions, 0 deletions

diff --git a/core/UpdateCheck.php b/core/UpdateCheck.php
new file mode 100644
index 0000000000..fe43bfc573
--- /dev/null
+++ b/core/UpdateCheck.php
@@ -0,0 +1,49 @@
+<?php
+
+class Piwik_UpdateCheck 
+{
+	const CHECK_INTERVAL = 86400;
+	const LAST_TIME_CHECKED = 'UpdateCheck_LastTimeChecked';
+	const LATEST_VERSION = 'UpdateCheck_LatestVersion';
+	const PIWIK_HOST = 'http://api.piwik.org/1.0/getLatestVersion/';
+	const SOCKET_TIMEOUT = 2;
+	
+	public static function check()
+	{
+		$lastTimeChecked = Piwik_GetOption(self::LAST_TIME_CHECKED);
+		if($lastTimeChecked === false
+			|| time() - self::CHECK_INTERVAL > $lastTimeChecked )
+		{
+			$parameters = array(
+				'piwik_version' => Piwik_Version::VERSION,
+				'php_version' => phpversion(),
+				'url' => Piwik_Url::getCurrentUrlWithoutQueryString(),
+				'trigger' => Piwik_Common::getRequestVar('module','','string'),
+			);
+
+			$url = self::PIWIK_HOST . "?" . http_build_query($parameters, '', '&');
+			$timeout = self::SOCKET_TIMEOUT;
+			$latestVersion = Piwik::sendHttpRequest($url, $timeout);
+			Piwik_SetOption(self::LAST_TIME_CHECKED, time(), $autoload = 1);
+			Piwik_SetOption(self::LATEST_VERSION, $latestVersion);
+		}
+	}
+	
+	/**
+	 * @return string|false false if current version is the latest available, 
+	 * 	 or the latest version number if a newest release is available
+	 */
+	public static function isNewestVersionAvailable()
+	{
+		$latestVersion = Piwik_GetOption(self::LATEST_VERSION);
+		if(!empty($latestVersion)
+			&& version_compare(Piwik_Version::VERSION, $latestVersion) == -1)
+		{
+			return $latestVersion;
+		}
+		else
+		{
+			return false;
+		}
+	}
+}