Added username/password login to access locked calendars. Moved

calendar availability logic (with support for login) to a
calendar_functions.php file.

RSS feeds support the login feature when determining which calendars
to return.

Styles updated for the login box.

1 files changed, 113 insertions, 0 deletions

diff --git a/functions/calendar_functions.php b/functions/calendar_functions.php
new file mode 100644
index 0000000..84f22cc
--- /dev/null
+++ b/functions/calendar_functions.php
@@ -0,0 +1,113 @@
+<?php
+
+// This function returns a list of all calendars that the current user
+// has access to. Basically, all local calendars found in the calendar
+// directory, plus any webcals listed in the configuration file, but
+// excluding blacklisted calendars and locked calendars which the user,
+// if logged in, does not have access to.
+//
+// $username		= The username. Empty if no username provided.
+// $password		= The password. Empty if no password provided.
+// $cal_filename	= The calendar name without .ics.
+// $admin			= True if this is an administrative request, in
+//					  which case all local calendars only will be
+//					  returned.
+function availableCalendars($username, $password, $cal_filename, $admin = false) {
+	// Import globals.
+	global $calendar_path, $blacklisted_cals, $list_webcals, $locked_cals, $locked_map, $error_path_lang, $error_restrictedcal_lang, $ALL_CALENDARS_COMBINED;
+
+	// Create the list of available calendars.
+	$calendars = array();
+
+	// Grab the list of unlocked calendars.
+	$unlocked_cals = array();
+	if (isset($locked_map["$username:$password"])) {
+		$unlocked_cals = $locked_map["$username:$password"];
+	}
+	
+	// Include all local and web calendars if asking for all calendars
+	// combined.
+	if ($cal_filename == $ALL_CALENDARS_COMBINED || $admin) {
+		// Add local calendars.
+		$dir_handle = @opendir($calendar_path)
+			or die(error(sprintf($error_path_lang, $calendar_path), $cal_filename));
+		while (($file = readdir($dir_handle)) != false) {
+			// Make sure this is not a dot file and it ends with .ics,
+			// and that it is not blacklisted.
+			if (!preg_match("/^[^.].+\.ics$/i", $file)) continue;
+			$cal_name = substr($file, 0, -4);
+			if (in_array($cal_name, $blacklisted_cals)) continue;
+			
+			// Exclude locked calendars.
+			if (!$admin &&
+				in_array($cal_name, $locked_cals) &&
+				!in_array($cal_name, $unlocked_cals))
+			{
+				continue;
+			}
+			
+			// Add this calendar.
+			array_push($calendars, "$calendar_path/$file");
+		}
+		
+		// Add web calendars.
+		if (!$admin) {
+			foreach ($list_webcals as $file) {
+				// Make sure the URL ends with .ics.
+				if (!preg_match("/.ics$/i", $file)) continue;
+				
+				// Add this calendar.
+				array_push($calendars, $file);
+			}
+		}
+	}
+	
+	// Otherwise just include the requested calendar.
+	else {
+		// Make sure this is not a blacklisted calendar. We don't have
+		// to remove a .ics suffix because it would not have been passed
+		// in the argument.
+		if (in_array($cal_filename, $blacklisted_cals))
+			exit(error($error_restrictedcal_lang, $cal_filename));
+		
+		// Make sure this calendar is not locked.
+		if (in_array($cal_filename, $locked_cals) &&
+			!in_array($cal_filename, $unlocked_cals))
+		{
+			// Use the invalid calendar message so that the user is
+			// not made aware of locked calendars.
+			exit(error($error_invalidcal_lang, $cal_filename));
+		}
+		
+		// Add this calendar.
+		array_push($calendars, "$calendar_path/$cal_filename.ics");
+	}
+	
+	// Return the sorted calendar list.
+	natcasesort($calendars);
+	return $calendars;
+}
+
+// This function returns the result of the availableCalendars function
+// but only includes the calendar filename (including the .ics) and not
+// the entire path.
+//
+// $username		= The username. Empty if no username provided.
+// $password		= The password. Empty if no password provided.
+// $cal_filename	= The calendar name without .ics.
+// $admin			= True if this is an administrative request, in
+//					  which case all local calendars only will be
+//					  returned.
+function availableCalendarNames($username, $password, $cal_filename, $admin = false) {
+	// Grab the available calendar paths.
+	$calendars = availableCalendars($username, $password, $cal_filename, $admin);
+
+	// Strip the paths off the calendars.
+	foreach (array_keys($calendars) as $key) {
+		$calendars[$key] = basename($calendars[$key]);
+	}
+	
+	// Return the sorted calendar names.
+	natcasesort($calendars);
+	return $calendars;
+}