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calendar.php
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calendar.php
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<?php
/*
PHPCalFeed
A calendar feed script
Copyright (C) 2014 Mark Frimston
mfrimston@gmail.com
*/
// TODO: move heavy lifting to included file?
// TODO: events which started in the past but are still ongoing are excluded from feeds
// TODO: Filename in config for local files
// TODO: sql database input using pdo
// TODO: icalendar proper timezone construction
// TODO: CalDAV
// TODO: format for screen readers
// TODO: format for printing
// TODO: facebook input
// TODO: wordpress api
// TODO: eventbrite input
// TODO: yaml input
// TODO: yaml output
// TODO: atom output
// TODO: yaml output
// TODO: s-expression input
// TODO: textpattern api
// TODO: web-based UI for config
// TODO: web-based UI input
// TODO: microformat shouldn't have multiple events for day-spanning event
// TODO: browser cache headers
// TODO: need better way to handle incrementing from start time
// TODO: internationalisation
abstract class InputFormat {
/* name
description
url
events (required)
name (required)
date (required) (year,month,day)
time (hour, minute, second)
duration (days,hours,minutes,seconds)
description
url
recurring-events
name (required)
recurrence (required,list) (start,[end],[count],week-start,rules)
excluding (list) (start,[end],[count],week-start,rules)
duration (days,hours,minutes,seconds)
description
url */
public abstract function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config);
public abstract function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config);
protected function file_read_due($filepath,$cachedtime,$oldestinputok){
return $cachedtime <= @filemtime($filepath) || $cachedtime <= $oldestinputok;
}
protected function url_read_due($cachedtime,$oldestinputok){
return $cachedtime <= $oldestinputok;
}
protected function get_error_filename($scriptdir,$scriptname){
return "$scriptname.error";
}
protected function check_cached_error($scriptdir,$scriptname){
$errorfile = $this->get_error_filename($scriptdir,$scriptname);
$errortime = @filemtime($errorfile);
if($errortime===FALSE) return;
if(time() - $errortime > 20*60){ // error file is valid for 20 minutes
unlink($errorfile);
return;
}
$error = @file_get_contents($errorfile);
if($error===FALSE) return;
return $error;
}
protected function cache_error($scriptdir,$scriptname,$error){
$errorfile = $this->get_error_filename($scriptdir,$scriptname);
$handle = @fopen($errorfile,"w");
if($handle===FALSE) return;
fwrite($handle,$error);
fclose($handle);
}
}
class NoInput extends InputFormat {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "none") return FALSE;
return $this->get_empty_data();
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
$result = write_config($scriptdir,$scriptname,array("format"=>"none"));
if($result) return $result;
return $this->get_empty_data();
}
private function get_empty_data(){
$data = new stdClass();
$data->events = array();
$data->{"recurring-events"} = array();
return $data;
}
}
abstract class HtmlInputBase extends InputFormat {
/*
name xpath
description xpath
url xpath
event xpath
name xpath
description xpath
start datetime xpath
start time xpath
duration xpath
end datetime xpath
end time xpath
url xpath
(no recurring)
Defaults to hcalendar spec
*/
protected function is_available(){
return extension_loaded("libxml") && extension_loaded("dom");
}
private function el_with_class_xp($elname,$classname){
$classname = trim($classname);
return $elname."[contains(concat(' ',normalize-space(@class),' '),' $classname ')]";
}
private function el_contents_with_class_xp($prefix,$classname){
return $prefix.$this->el_with_class_xp("img",$classname)."/@alt"
." | ".$prefix.$this->el_with_class_xp("area",$classname)."/@alt"
." | ".$prefix.$this->el_with_class_xp("data",$classname)."/@value"
." | ".$prefix.$this->el_with_class_xp("abbr",$classname)."/@title"
." | ".$prefix.$this->el_with_class_xp("*",$classname)."//text()";
}
private function std_el_contents_with_class_xp($classname){
return $this->el_contents_with_class_xp(".//".$this->el_with_class_xp("*",$classname)."//","value")
." | ".$this->el_contents_with_class_xp(".//",$classname);
}
private function anchor_contents_with_class_xp($classname){
return $this->el_contents_with_class_xp(".//".$this->el_with_class_xp("*",$classname)."//","value")
." | ".".//".$this->el_with_class_xp("a",$classname)."/@href"
." | ".".//".$this->el_with_class_xp("link",$classname)."/@href"
." | ".$this->el_contents_with_class_xp(".//",$classname);
}
private function date_contents_with_class_xp($classname){
return $this->el_contents_with_class_xp(".//".$this->el_with_class_xp("*",$classname)."//","value")
." | ".".//".$this->el_with_class_xp("del",$classname)."/@datetime"
." | ".".//".$this->el_with_class_xp("ins",$classname)."/@datetime"
." | ".".//".$this->el_with_class_xp("time",$classname)."/@datetime"
." | ".$this->el_contents_with_class_xp(".//",$classname);
}
private function get_xpath_result($node,$context,$xpath){
$results = $context->query($xpath,$node);
if($results===FALSE) return "HTML: Bad XPath expression '$xpath'";
return $results;
}
private function resolve_single_xpath($node,$context,$xpath){
$results = $this->get_xpath_result($node,$context,$xpath);
if(is_string($results)) return $results;
foreach($results as $result){
$text = $result->nodeValue;
if(strlen(trim($text))==0) continue;
return array( "text"=> $text );
}
return FALSE;
}
private function resolve_concat_xpath($node,$context,$xpath){
$bits = array();
$results = $this->get_xpath_result($node,$context,$xpath);
if(is_string($results)) return $results;
foreach($results as $result){
$text = $result->nodeValue;
if(strlen(trim($text))==0) continue;
array_push($bits,trim($text));
}
if(sizeof($bits)==0) return FALSE;
return array( "text" => implode(" ",$bits) );
}
private function resolve_duration_xpath($node,$context,$xpath){
$results = $this->get_xpath_result($node,$context,$xpath);
if(is_string($results)) return $results;
foreach($results as $result){
$text = $result->nodeValue;
$duration = parse_duration($text);
if($duration===FALSE) continue;
return $duration;
}
return FALSE;
}
private function resolve_date_xpath($node,$context,$xpath){
$date = NULL;
$time = NULL;
$gotspectime = FALSE;
$results = $this->get_xpath_result($node,$context,$xpath);
if(is_string($results)) return $results;
foreach($results as $result){
$text = $result->nodeValue;
$parsed = parse_time($text);
if($parsed!==FALSE){
// time without date found - override existing time if it was part of
// a datetime as it may have been the default time
if(!$gotspectime){
$time = array( "hour"=>$parsed["hour"], "minute"=>$parsed["minute"],
"day"=>$parsed["day"] );
$gotspectime = TRUE;
if($date!==NULL && $time!==NULL) break;
}
}else{
$parsed = parse_datetime($text);
if($parsed===FALSE) continue;
if($date===NULL){
$date = array( "year"=>$parsed["year"], "month"=>$parsed["month"],
"day"=>$parsed["day"] );
}
if($time===NULL){
$time = array( "hour"=>$parsed["hour"], "minute"=>$parsed["minute"],
"second"=>$parsed["second"] );
}
// don't break, as we might find a more specific time value
}
}
if($date===NULL || $time===NULL) return FALSE;
return array( "date"=>$date, "time"=>$time );
}
protected abstract function get_calendar_url($resource_name,$config);
protected function stream_to_event_data($filehandle,$resource_name,$config){
$xp_cal_summary = "/html/head/title//text()";
$xp_cal_description = "/html/head/meta[@name='description']/@content";
$xp_cal_url = NULL;
$xp_event = "//".$this->el_with_class_xp("*","vevent"); // defines context element for event properties
$xp_ev_summary = $this->std_el_contents_with_class_xp("summary");
$xp_ev_description = $this->std_el_contents_with_class_xp("description");
$xp_ev_url = $this->anchor_contents_with_class_xp("url");
$xp_ev_dtstart = $this->date_contents_with_class_xp("dtstart");
$xp_ev_dtend = $this->date_contents_with_class_xp("dtend");
$xp_ev_duration = $this->std_el_contents_with_class_xp("duration");
if(isset($config["html-markers"])){
$markers = $config["html-markers"];
if(isset($markers["cal-name-class"])) $xp_cal_summary = $this->std_el_contents_with_class_xp($markers["cal-name-class"]);
if(isset($markers["cal-name-xpath"])) $xp_cal_summary = $markers["cal-name-xpath"];
if(isset($markers["cal-description-class"])) $xp_cal_description = $this->std_el_contents_with_class_xp($markers["cal-description-class"]);
if(isset($markers["cal-description-xpath"])) $xp_cal_description = $markers["cal-description-xpath"];
if(isset($markers["cal-url-class"])) $xp_cal_url = $this->std_el_contents_with_class_xp($markers["cal-url-class"]);
if(isset($markers["cal-url-xpath"])) $cap_cal_xpath = $markers["cal-url-xpath"];
if(isset($markers["cal-event-class"])) $xp_event = "//".$this->el_with_class_xp("*",$markers["cal-event-class"]);
if(isset($markers["cal-event-xpath"])) $xp_event = $markers["cal-event-xpath"];
if(isset($markers["ev-name-class"])) $xp_ev_summary = $this->std_el_contents_with_class_xp($markers["ev-name-class"]);
if(isset($markers["ev-name-xpath"])) $xp_ev_summary = $markers["ev-name-xpath"];
if(isset($markers["ev-description-class"])) $xp_ev_description = $this->std_el_contents_with_class_xp($markers["ev-description-class"]);
if(isset($markers["ev-description-xpath"])) $xp_ev_description = $markers["ev-description-xpath"];
if(isset($markers["ev-url-class"])) $xp_ev_url = $this->anchor_contents_with_class_xp($markers["ev-url-class"]);
if(isset($markers["ev-url-xpath"])) $xp_ev_url = $markers["ev-url-xpath"];
if(isset($markers["ev-start-class"])) $xp_ev_dtstart = $this->date_contents_with_class_xp($markers["ev-start-class"]);
if(isset($markers["ev-start-xpath"])) $xp_ev_dtstart = $markers["ev-start-xpath"];
if(isset($markers["ev-end-class"])) $xp_ev_dtend = $this->date_contents_with_class_xp($markers["ev-end-class"]);
if(isset($markers["ev-end-xpath"])) $xp_ev_dtend = $markers["ev-end-xpath"];
if(isset($markers["ev-duration-class"])) $xp_ev_duration = $this->std_el_contents_with_class_xp($markers["ev-duration-class"]);
if(isset($markers["ev-duration-xpath"])) $xp_ev_duration = $markers["ev-duration-xpath"];
}
$html = stream_get_contents($filehandle);
if($html===FALSE) return "HTML: Failed to read stream";
$doc = new DOMDocument();
@$doc->loadHTML($html);
if($doc===FALSE) return "HTML: Failed to parse page";
$xpath = new DOMXPath($doc);
$data = new stdClass();
$calname = $this->resolve_concat_xpath($doc->documentElement,$xpath,$xp_cal_summary);
if(is_string($calname)) return $calname;
if($calname!==FALSE) $data->name = $calname["text"];
$caldesc = $this->resolve_concat_xpath($doc->documentElement,$xpath,$xp_cal_description);
if(is_string($caldesc)) return $caldesc;
if($caldesc!==FALSE) $data->description = $caldesc["text"];
if($xp_cal_url!==NULL){
$calurl = $this->resolve_single_xpath($doc->documentElement,$xpath,$xp_cal_url);
if(is_string($calurl)) return $calurl;
if($calurl!==FALSE) $data->url = $calurl["text"];
}else{
$calurl = $this->get_calendar_url($resource_name,$config);
if($calurl!==FALSE) $data->url = $calurl;
}
$event_els = $this->get_xpath_result($doc->documentElement,$xpath,$xp_event);
if(is_string($event_els)) return $event_els;
$data->events = array();
foreach($event_els as $event_el){
$event = new stdClass();
$name = $this->resolve_concat_xpath($event_el,$xpath,$xp_ev_summary);
if(is_string($name)) return $name;
if($name===FALSE) continue;
$event->name = $name["text"];
$description = $this->resolve_concat_xpath($event_el,$xpath,$xp_ev_description);
if(is_string($description)) return $description;
if($description!==FALSE) $event->description = $description["text"];
$url = $this->resolve_single_xpath($event_el,$xpath,$xp_ev_url);
if(is_string($url)) return $url;
if($url!==FALSE) $event->url = $url["text"];
$start = $this->resolve_date_xpath($event_el,$xpath,$xp_ev_dtstart);
if(is_string($start)) return $start;
if($start===FALSE) continue;
$event->date = $start["date"];
$event->time = $start["time"];
$end = $this->resolve_date_xpath($event_el,$xpath,$xp_ev_dtend);
if(is_string($end)) return $end;
if($end!==FALSE){
$event->duration = calc_approx_diff($event->date,$event->time,$end["date"],$end["time"]);
}else{
$duration = $this->resolve_duration_xpath($event_el,$xpath,$xp_ev_duration);
if(is_string($duration)) return $duration;
if($duration!==FALSE){
$event->duration = $duration;
}else{
$event->duration = array( "days"=>1, "hours"=>0, "minutes"=>0, "seconds"=>0 );
}
}
array_push($data->events,$event);
}
$data->{"recurring-events"} = array();
return $data;
}
}
class LocalHtmlInput extends HtmlInputBase {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "html-local") return FALSE;
if(!$this->is_available()) return FALSE;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config);
if($result === FALSE) return TRUE;
return $result;
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
if(!$this->is_available()) return FALSE;
if(!file_exists($this->get_filepath($scriptdir,$scriptname))) return FALSE;
$result = write_config($scriptdir,$scriptname,array("format"=>"html-local"));
if($result) return $result;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config);
if($result === FALSE) return TRUE;
return $result;
}
private function get_filepath($scriptdir,$scriptname){
return $scriptdir."/".$scriptname."-master.html";
}
protected function get_calendar_url($filepath,$config){
$url = get_file_protocolless_url($filepath,$config);
if($url===FALSE) return FALSE;
return "http:".$url;
}
private function do_input($filepath){
$handle = @fopen($filepath,"r");
if($handle===FALSE) return "HTML: failed to open '$filepath'";
$result = $this->stream_to_event_data($handle,$filepath,$config);
fclose($handle);
return $result;
}
private function input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
$filepath = $this->get_filepath($scriptdir,$scriptname);
if(!$this->file_read_due($filepath,$cachedtime,$oldestinputok)) return FALSE;
$error = $this->check_cached_error($scriptdir,$scriptname);
if($error) return $error;
$result = $this->do_input($filepath);
if(is_string($result)) $this->cache_error($scriptdir,$scriptname,$result);
return $result;
}
}
class RemoteHtmlInput extends HtmlInputBase {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "html-remote") return FALSE;
if(!$this->is_available()) return FALSE;
if(!isset($config["url"])) return "HTML: missing config parameter: 'url'";
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config["url"],$config);
if($result === FALSE) return TRUE;
return $result;
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
if(!isset($config["url"])) return FALSE;
if(strtolower(substr($config["url"],-4,4)) != ".htm" && strtolower(substr($config["url"],-5,5)) != ".html") return FALSE;
$result = write_config($scriptdir,$scriptname,array("format"=>"html-remote","url"=>$config["url"]));
if($result) return $result;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config["url"],$config);
if($result === FALSE) return TRUE;
return $result;
}
protected function get_calendar_url($url,$config){
return $url;
}
private function do_input($url){
$handle = http_request($url);
if(is_string($handle)) return "HTML: $handle";
$result = $this->stream_to_event_data($handle,$url,$config);
fclose($handle);
}
public function input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$url,$config){
if(!$this->url_read_due($cachedtime,$oldestinputok)) return FALSE;
$error = $this->check_cached_error($scriptdir,$scriptname);
if($error) return $error;
$result = $this->do_input($url);
if(is_string($result)) $this->cache_error($scriptdir,$scriptname,$result);
return $result;
}
}
abstract class ICalendarInputBase extends InputFormat {
protected function feed_to_event_data($filehandle){
$parser = new ICalendarParser();
$cal = $parser->parse($filehandle);
if(is_string($cal)) return "ICalendar: Invalid ICalendar feed: $cal";
$calobj = new stdClass();
$calobj->events = array();
$calobj->{"recurring-events"} = array();
if($cal["name"]!="VCALENDAR"){
return "ICalendar: Expected VCALENDAR component but found".$cal["name"];
}
if(isset($cal["properties"]["calscale"])
&& strtolower($cal["properties"]["calscale"][0]["value"][0]) != "gregorian"){
return "ICalendar: Non-gregorian calendar not supported";
}
if(isset($cal["properties"]["x-wr-calname"])){
$calobj->name = $cal["properties"]["x-wr-calname"][0]["value"][0];
}
if(isset($cal["properties"]["x-wr-caldesc"])){
$calobj->description = $this->concat_prop_values($cal["properties"]["x-wr-caldesc"]);
}
if(isset($cal["properties"]["x-original-url"])){
$calobj->url = $cal["properties"]["x-original-url"][0]["value"][0];
}
if(isset($cal["components"]["VEVENT"])){
foreach($cal["components"]["VEVENT"] as $vevent){
$eventobj = new stdClass();
if(isset($vevent["properties"]["summary"])){
$eventobj->name = $this->concat_prop_values($vevent["properties"]["summary"]);
}else{
$eventobj->name = "Unnamed event";
}
if(isset($vevent["properties"]["description"])
&& strlen($vevent["properties"]["description"][0]["value"][0])>0){
$eventobj->description = $this->concat_prop_values($vevent["properties"]["description"]);
}
if(isset($vevent["properties"]["url"])){
$eventobj->url = $vevent["properties"]["url"][0]["value"];
}
if(!isset($vevent["properties"]["dtstart"])){
continue; // ignore if no start time
}
$starttimes = $this->convert_datetime($vevent["properties"]["dtstart"][0]);
if(is_string($starttimes)) return $starttimes;
$starttime = $starttimes[0];
$eventobj->date = array( "year"=>$starttime["year"], "month"=>$starttime["month"], "day"=>$starttime["day"] );
$eventobj->time = array( "hour"=>$starttime["hour"], "minute"=>$starttime["minute"], "second"=>$starttime["second"] );
if(isset($vevent["properties"]["duration"])){
// duration specified
$duration = $this->convert_duration($vevent["properties"]["duration"][0]);
if(is_string($duration)) return $duration;
$eventobj->duration = $duration;
}elseif(isset($vevent["properties"]["dtstart"])){
$dtstart = $vevent["properties"]["dtstart"][0];
if(isset($vevent["properties"]["dtend"])){
// start and end specified
$starttimes = $this->convert_datetime($dtstart);
if(is_string($starttimes)) return $starttimes;
$starttime = $starttimes[0];
$endtimes = $this->convert_datetime($vevent["properties"]["dtend"][0]);
if(is_string($endtimes)) return $endtimes;
$endtime = $endtimes[0];
$eventobj->duration = calc_approx_diff(
array( "year"=>$starttime["year"], "month"=>$starttime["month"], "day"=>$starttime["day"] ),
array( "hour"=>$starttime["hour"], "minute"=>$starttime["minute"], "second"=>$starttime["second"] ),
array( "year"=>$endtime["year"], "month"=>$endtime["month"], "day"=>$endtime["day"] ),
array( "hour"=>$endtime["hour"], "minute"=>$endtime["minute"], "second"=>$endtime["second"] )
);
}elseif(isset($dtstart["parameters"]["value"]) && strtolower($dtstart["parameters"]["value"])=="date"){
// start specified as date
$eventobj->duration = array("days"=>1,"hours"=>0,"minutes"=>0, "seconds"=>0);
}else{
// start specified as datetime
$eventobj->duration = array("days"=>0,"hours"=>0,"minutes"=>0, "seconds"=>0);
}
}else{
return "ICalendar: Cannot determine duration for '".$eventobj->name."'";
}
array_push($calobj->events,$eventobj);
$rrules = isset($vevent["properties"]["rrule"]) ? $vevent["properties"]["rrule"] : NULL;
$exrules = isset($vevent["properties"]["exrule"]) ? $vevent["properties"]["exrule"] : NULL;
$rdates = isset($vevent["properties"]["rdate"]) ? $vevent["properties"]["rdate"] : NULL;
$exdates = isset($vevent["properties"]["exdate"]) ? $vevent["properties"]["exdate"] : NULL;
if($rrules!==NULL || $exrules!==NULL || $rdates!==NULL || $exdates!==NULL){
$convrecur = $this->convert_recurrence($rrules,$exrules,$rdates,$exdates,$starttime);
if(is_string($convrecur)) return $convrecur;
$eventobj->recurrence = $convrecur["include"];
$eventobj->excluding = $convrecur["exclude"];
array_push($calobj->{"recurring-events"},$eventobj);
}
}
}
return $calobj;
}
private function concat_prop_values($properties){
$result = "";
foreach($properties as $prop){
foreach($prop["value"] as $value){
$result .= $value;
}
}
return $result;
}
private function convert_datetime($property){
if(isset($property["parameters"]["value"]) && strtolower($property["parameters"]["value"])=="date"){
# date only
$result = array();
foreach($property["value"] as $date){
array_push($result, array( "year"=>$date["year"], "month"=>$date["month"], "day"=>$date["day"],
"hour"=>0, "minute"=>0, "second"=>0));
}
return $result;
}else{
# date and time
$result = array();
foreach($property["value"] as $value){
$datetime = $this->convert_datetime_value($value,$property["parameters"]);
if(is_string($datetime)) return $datetime;
array_push($result,$datetime);
}
return $result;
}
}
private function convert_datetime_value($value,$parameters){
if($value["isutc"]){
$timezone = new DateTimeZone("UTC");
}elseif(isset($parameters["tzid"])){
$tzid = $parameters["tzid"];
try {
$timezone = new DateTimeZone($tzid);
}catch(Exception $e){
return "ICalendar: timezone '$tzid' unknown and timezone construction not implemented";
}
}else{
$newdate = new DateTime();
$timezone = $newdate->getTimezone();
}
$cal = new DateTime($value["year"]."-".$value["month"]."-".$value["day"]
." ".$value["hour"].":".$value["minute"].":".$value["second"], $timezone);
$cal = new DateTime("@".$cal->getTimestamp());
return array( "year"=>(int)$cal->format("Y"), "month"=>(int)$cal->format("n"), "day"=>(int)$cal->format("j"),
"hour"=>(int)$cal->format("G"), "minute"=>(int)$cal->format("i"), "second"=>(int)$cal->format("s") );
}
private function convert_duration($property){
$dur = $property["value"][0];
return array( "days"=>$dur["weeks"]*7+$dur["days"], "hours"=>$dur["hours"],
"minutes"=>$dur["minutes"], "seconds"=>$dur["seconds"] );
}
private function convert_recur_rule($rrule,$starttime){
if(!isset($rrule["freq"])) return "ICalendar: RRULE without FREQ parameter";
$result = array( "start"=>$starttime, "rules"=>array(), "week-start"=>1 );
if(isset($rrule["until"])){
$result["end"] = $this->convert_datetime_value($rrule["until"],array());
}
if(isset($rrule["count"])){
$result["count"] = $rrule["count"] - 1; // internal format doesnt include dtstart occurence
}
if(isset($rrule["wkst"])){
switch($rrule["wkst"]){
case "mo": $daynum = 1; break;
case "tu": $daynum = 2; break;
case "we": $daynum = 3; break;
case "th": $daynum = 4; break;
case "fr": $daynum = 5; break;
case "sa": $daynum = 6; break;
case "su": $daynum = 7; break;
default: return "ICalendar: invalid WKST value '".$rrule["wkst"]."'";
}
$result["week-start"] = $daynum;
}
if(isset($rrule["interval"])){
switch($rrule["freq"]){
case "yearly": $rulename="year-ival"; break;
case "monthly": $rulename="month-ival"; break;
case "weekly": $rulename="week-ival"; break;
case "daily": $rulename="day-ival"; break;
case "hourly": $rulename="hour-ival"; break;
case "minutely": $rulename="minute-ival"; break;
case "secondly": $rulename="second-ival"; break;
default: return "ICalendar: Unknown FREQ value '".$rrule["freq"]."'";
}
$result["rules"][$rulename] = $rrule["interval"];
}
if(isset($rrule["bysecond"])){
$result["rules"]["minute-second"] = $rrule["bysecond"];
}
if(isset($rrule["byminute"])){
$result["rules"]["hour-minute"] = $rrule["byminute"];
}
if(isset($rrule["byhour"])){
$result["rules"]["day-hour"] = $rrule["byhour"];
}
if(isset($rrule["byday"])){
$rulebits = array();
foreach($rrule["byday"] as $byday){
switch($byday["day"]){
case "mo": $daynum = 1; break;
case "tu": $daynum = 2; break;
case "we": $daynum = 3; break;
case "th": $daynum = 4; break;
case "fr": $daynum = 5; break;
case "sa": $daynum = 6; break;
case "su": $daynum = 7; break;
default: return "ICalendar: invalid day value '".$byday["day"]."'";
}
$rulebit = array( "day"=>$daynum );
if(isset($byday["number"])){
$rulebit["number"] = $byday["number"];
}
array_push($rulebits,$rulebit);
}
if($rrule["freq"]=="monthly" || ($rrule["freq"]=="yearly" && isset($rrule["bymonth"]))){
$result["rules"]["month-week-day"] = $rulebits;
}else{
$result["rules"]["year-week-day"] = $rulebits;
}
}
if(isset($rrule["bymonthday"])){
$result["rules"]["month-day"] = $rrule["bymonthday"];
}
if(isset($rrule["byyearday"])){
$result["rules"]["year-day"] = $rrule["byyearday"];
}
if(isset($rrule["byweekno"])){
$result["rules"]["year-week"] = $rrule["byweekno"];
}
if(isset($rrule["bymonth"])){
$result["rules"]["year-month"] = $rrule["bymonth"];
}
if(isset($rrule["bysetpos"])){
$poses = $rrule["bysetpos"];
switch($rrule["freq"]){
case "yearly": $result["rules"]["year-match"] = $poses; break;
case "monthly": $result["rules"]["month-match"] = $poses; break;
case "weekly": $result["rules"]["week-match"] = $poses; break;
case "daily": $result["rules"]["day-match"] = $poses; break;
case "hourly": $result["rules"]["hour-match"] = $poses; break;
case "minutely": $result["rules"]["minute-match"] = $poses; break;
case "secondly": $result["rules"]["second-match"] = $poses; break;
default: return "ICalendar: invalid FREQ value '".$rrule["freq"]."'";
}
}
// fill in remaining rules from dtstart
switch($rrule["freq"]){
case "yearly":
if(!isset($result["rules"]["year-month"]) && !isset($result["rules"]["year-week"])
&& !isset($result["rules"]["year-day"]) && !isset($result["rules"]["year-week-day"])
&& !isset($result["rules"]["month-day"]) && !isset($result["rules"]["month-week-day"])
&& !isset($result["rules"]["day-hour"]) && !isset($result["rules"]["hour-minute"])
&& !isset($result["rules"]["minute-second"])){
$result["rules"]["year-month"] = array( $starttime["month"] );
}
// fall through
case "monthly":
if(!isset($result["rules"]["year-week"]) && !isset($result["rules"]["year-day"])
&& !isset($result["rules"]["year-week-day"]) && !isset($result["rules"]["month-day"])
&& !isset($result["rules"]["month-week-day"]) && !isset($result["rules"]["day-hour"])
&& !isset($result["rules"]["hour-minute"]) && !isset($result["rules"]["minute-second"])){
$result["rules"]["month-day"] = array( $starttime["day"] );
}
// fall through
case "weekly":
if(!isset($result["rules"]["year-day"]) && !isset($result["rules"]["year-week-day"])
&& !isset($result["rules"]["month-day"]) && !isset($result["rules"]["month-week-day"])
&& !isset($result["rules"]["day-hour"]) && !isset($result["rules"]["hour-minute"])
&& !isset($result["rules"]["minute-second"])){
$cal = new DateTime($starttime["year"]."-".$starttime["month"]."-".$starttime["day"]
." ".$starttime["hour"].":".$starttime["minute"].":".$starttime["second"]);
$dow = $cal->format("N");
$result["rules"]["year-week-day"] = array( array("day"=>$dow) );
}
// fall through
case "daily":
if(!isset($result["rules"]["day-hour"]) && !isset($result["rules"]["hour-minute"])
&& !isset($result["rules"]["minute-second"])){
$result["rules"]["day-hour"] = array( $starttime["hour"] );
}
// fall through
case "hourly":
if(!isset($result["rules"]["hour-minute"]) && !isset($result["rules"]["minute-second"])){
$result["rules"]["hour-minute"] = array( $starttime["minute"] );
}
// fall through
case "minutely":
if(!isset($result["rules"]["minute-second"])){
$result["rules"]["minute-second"] = array( $starttime["second"] );
}
// fall through
case "secondly":
break; // nothing
default: return "ICalendar: invalid FREQ value '".$rrule["freq"]."'";
}
return $result;
}
private function convert_recurrence($rruleprops,$exruleprops,$rdateprops,$exdateprops,$starttime){
if($rruleprops===NULL && $rdateprops===NULL) return "ICalendar: Must specify RRULE or RDATE";
$results = array( "include"=>array(), "exclude"=>array() );
if($rruleprops!==NULL){
foreach($rruleprops as $rruleprop){
foreach($rruleprop["value"] as $rrule){
$result = $this->convert_recur_rule($rrule,$starttime);
if(is_string($result)) return $result;
array_push($results["include"],$result);
}
}
}
if($exruleprops!==NULL){
foreach($exruleprops as $exruleprop){
foreach($exruleprop["value"] as $exrule){
$result = $this->convert_recur_rule($exrule,$starttime);
if(is_string($result)) return $result;
array_push($results["exclude"],$result);
}
}
}
if($rdateprops!==NULL){
foreach($rdateprops as $rdateprop){
$rdtimes = $this->convert_datetime($rdateprop);
if(is_string($rdtimes)) return $rdtimes;
foreach($rdtimes as $rdtime){
$result = array( "start"=>$starttime, "rules"=>array(
"year"=>array($rdtime["year"]), "year-month"=>array($rdtime["month"]),
"month-day"=>array($rdtime["day"]),"day-hour"=>array($rdtime["hour"]),
"hour-minute"=>array($rdtime["minute"]), "minute-second"=>array($rdtime["second"])
), "week-start"=>1 );
array_push($results["include"],$result);
}
}
}
if($exdateprops!==NULL){
foreach($exdateprops as $exdateprop){
$edtimes = $this->convert_datetime($exdateprop);
if(is_string($edtimes)) return $edtimes;
foreach($edtimes as $edtime){
$result = array( "start"=>$starttime, "rules"=>array(
"year"=>array($edtime["year"]), "year-month"=>array($edtime["month"]),
"month-day"=>array($edtime["day"]),"day-hour"=>array($edtime["hour"]),
"hour-minute"=>array($edtime["minute"]), "minute-second"=>array($edtime["second"])
), "week-start"=>1 );
array_push($results["exclude"],$result);
}
}
}
return $results;
}
}
class LocalICalendarInput extends ICalendarInputBase {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "icalendar-local") return FALSE;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok);
if($result === FALSE) return TRUE;
return $result;
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
if(!file_exists($this->get_filepath($scriptdir,$scriptname))) return FALSE;
$result = write_config($scriptdir,$scriptname,array("format"=>"icalendar-local"));
if($result) return $result;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok);
if($result === FALSE) return TRUE;
return $result;
}
private function get_filepath($scriptdir,$scriptname){
return $scriptdir."/".$scriptname."-master.ics";
}
private function do_input($filepath){
$handle = @fopen($filepath,"r");
if($handle === FALSE) return "ICalendar: Failed to open '$filepath'";
$data = $this->feed_to_event_data($handle);
fclose($handle);
return $data;
}
private function input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok){
$filepath = $this->get_filepath($scriptdir,$scriptname);
if(!$this->file_read_due($filepath,$cachedtime,$oldestinputok)) return FALSE;
$error = $this->check_cached_error($scriptdir,$scriptname);
if($error) return $error;
$data = $this->do_input($filepath);
if(is_string($data)) $this->cache_error($scriptdir,$scriptname,$data);
return $data;
}
}
class RemoteICalendarInput extends ICalendarInputBase {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "icalendar-remote") return FALSE;
if(!isset($config["url"])) return "ICalendar: missing config parameter: 'url'";
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config["url"]);
if($result === FALSE) return TRUE;
return $result;
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
if(!isset($config["url"])) return FALSE;
if(strtolower(substr($config["url"],-4,4)) != ".ics"
&& strtolower(substr($config["url"],-5,5)) != ".ical"
&& strtolower(substr($config["url"],-10,10)) != ".icalendar")
return FALSE;
$result = write_config($scriptdir,$scriptname,array("format"=>"icalendar-remote","url"=>$config["url"]));
if($result) return $result;
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config["url"]);
if($result === FALSE) return TRUE;
return $result;
}
private function do_input($url){
$handle = http_request($url);
if(is_string($handle)) return "ICalendar: $handle";
$result = $this->feed_to_event_data($handle);
fclose($handle);
return $result;
}
protected function input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$url){
if(!$this->url_read_due($cachedtime,$oldestinputok)) return FALSE;
$error = $this->check_cached_error($scriptdir,$scriptname);
if($error) return $error;
$result = $this->do_input($url);
if(is_string($result)) $this->cache_error($scriptdir,$scriptname,$result);
return $result;
}
}
class RemoteOpenACalendarInput extends RemoteICalendarInput {
public function attempt_handle_by_name($scriptdir,$scriptname,$formatname,$cachedtime,$oldestinputok,$config){
if($formatname != "openacalendar-remote") return FALSE;
if(!isset($config["url"])) return "OpenACalendar: missing config parameter: 'url'";
$url = 'http://' . $config['url'] . '/api1';
if (isset($config['group']) && $config['group']) {
$url .= '/group/'. $config['group'];
} else if (isset($config['venue']) && $config['venue']) {
$url .= '/venue/'.$config['venue'];
} else if (isset($config['area']) && $config['area']) {
$url .= '/area/'.$config['area'];
} else if (isset($config['curated_list']) && $config['curated_list']) {
$url .= '/curatedlist/'.$config['curated_list'];
} else if (isset($config['country']) && $config['country']) {
$url .= '/country/'.$config['country'];
}
$url .= '/events.ical';
$result = $this->input_if_necessary($scriptdir,$scriptname,$cachedtime,$oldestinputok,$url);
if($result === FALSE) return TRUE;
return $result;
}
public function attempt_handle_by_discovery($scriptdir,$scriptname,$cachedtime,$oldestinputok,$config){
return FALSE; // discovery not supported
}
}
abstract class CsvInputBase extends InputFormat {
protected $COL_PATTERNS = array(
"name" => "/^\\s*(name|title|summary|subject)\\s*$/i",
"description" => "/^\\s*(desc(ription)?)\\s*$/i",
"url" => "/^\\s*(url|uri|href|link|website)\\s*$/i",
"start-date" => "/^\\s*(date|start\\W*date|dtstart|start)\\s*$/i",
"start-time" => "/^\\s*(time|start\\W*time)\\s*$/i",
"end-date" => "/^\\s*(end\\W*date|dtend|end)\\s*$/i",
"end-time" => "/^\\s*(end\\W*time)\\s*$/i",
"duration" => "/^\\s*(dur(ation)?|length)\\s*$/i",
);
protected function stream_to_event_data($handle,$delimiter){
$header = @fgetcsv($handle,0,$delimiter);
if($header === FALSE){
return "CSV: Failed to read header row";
}
if(sizeof($header)==0){
return "CSV: No columns in header row";
}
$colmap = array();
foreach($header as $index => $label){
foreach($this->COL_PATTERNS as $col => $pattern){
if(preg_match($pattern,$label)){
$colmap[$col] = $index;
break;
}
}
}
foreach(array("name","start-date") as $req_key){
if(!array_key_exists($req_key,$colmap)){
return "CSV: Required column '$req_key' not found in header";
}
}
$data = new stdClass();
$data->events= array();
$data->{"recurring-events"} = array();
while( ($row = fgetcsv($handle,0,$delimiter)) !== FALSE ){
if(sizeof($row)==0 || (sizeof($row)==1 && $row[0]==NULL)) continue; # ignore blank lines
while(sizeof($row) < sizeof($colmap)) array_push($row,"");
$event = new stdClass();
$namestr = trim($row[$colmap["name"]]);
if(strlen($namestr)==0) return "CSV: Missing 'name' value";
$event->name = $namestr;
$starttime = array( "hour"=>0, "minute"=>0, "second"=>0 );
if(array_key_exists("start-time",$colmap)){
$starttstr = trim($row[$colmap["start-time"]]);
if(strlen($starttstr) > 0){
$parsed = parse_time($starttstr);
if($parsed===FALSE) return "CSV: Invalid start time format - expected 'hh:mm' or similar";
$starttime = $parsed;
}
}
$startdate = NULL;
$startdstr = trim($row[$colmap["start-date"]]);
if(strlen($startdstr)==0) return "CSV: Missing 'start-date' value";
$parsed = parse_datetime($startdstr);
if($parsed!==FALSE){
$startdate = $parsed;
$event->date = array( "year"=>$startdate["year"], "month"=>$startdate["month"],
"day"=>$startdate["day"] );
if($starttime["hour"]!=0 || $starttime["minute"]!=0 || $starttime["second"]!=0){
$event->time = $starttime;
}else{
$event->time = array( "hour"=>$startdate["hour"], "minute"=>$startdate["minute"],
"second"=>$startdate["second"] );
}
}else{
$parser = new RecurrenceParser();
$recur = $parser->parse(strtolower($startdstr),$starttime);
if($recur===FALSE){
return "CSV: Invalid start date format - expected date ('yyyy-mm-dd' or similar), or recurrence syntax";
}