initial commit

2026-06-25 21:30:32 +00:00
commit 328faf6251
220 changed files with 162103 additions and 0 deletions
@@ -0,0 +1,160 @@
+<?php
+/**
+ * Infinite looping PHP long-poller.
+ * NOTE: this is unauthenticated so put it behind e.g. htaccess and HTTPS
+ */
+// original from here:
+// https://github.com/panique/php-long-polling/blob/master/server/server.php
+
+// enable cors
+cors();
+
+// Set data directory to data if no one logged in
+// Otherwise to data/<username>
+$dir = "data";
+if ( getenv("TODO_PER_USER_FOLDERS") == 'TRUE') {
+  $dir = "data/".$_SERVER['PHP_AUTH_USER'];
+  if (!file_exists($dir)) {
+    mkdir($dir, 0777);
+  }
+}
+
+if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+  if (isset($_POST["filename"])) {
+    updateFile($_POST, $dir);
+  } elseif (isset($_POST["delete"])) {
+    deleteFile($_POST, $dir);
+  }
+} else {
+  dirPoller($dir);
+}
+
+function updateFile($update, $dir) {
+  $filename = basename($update["filename"]);
+  if (endsWith($filename, ".txt")) {
+    file_put_contents($dir . "/" . $filename, isset($update["content"]) ? $update["content"] : "");
+    echo json_encode(microtime(True));
+  } else {
+    echo json_encode(null);
+  }
+}
+
+function deleteFile($delete, $dir) {
+  $filename = $dir . "/" . basename($delete["delete"]);
+  if (endsWith($filename, ".txt") && file_exists($filename)) {
+    unlink($filename);
+    echo json_encode(microtime(True));
+  } else {
+    echo json_encode(null);
+  }
+}
+
+function dirPoller($datadir) {
+  // hang for a maximum of 30 seconds
+  $live_for = isset($_GET['live_for']) ? min((int)$_GET['live_for'], 180) : 30;
+  // tell PHP it can timeout after 30 seconds
+  set_time_limit($live_for);
+  ini_set("max_execution_time", $live_for);
+  // whether the loop has returned anything or not
+  $has_returned = false;
+  // start the wait-poll loop
+  while ($live_for--) {
+    // if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
+    $last_ajax_call = isset($_GET['timestamp']) ? (float)$_GET['timestamp'] : null;
+    // get timestamp of when file has been changed the last time
+    $last_change_in_data_files = dirTimestamp($datadir);
+    // if no timestamp delivered via ajax or data.txt has been changed SINCE last ajax timestamp
+    if ($last_ajax_call == null || (int)($last_change_in_data_files * 1000) > (int)($last_ajax_call * 1000)) {
+        // get content of data.txt
+        $data = dirFiles($datadir);
+        // put data.txt's content and timestamp of last data.txt change into array
+        $data["timestamp"] = $last_change_in_data_files;
+        // encode to JSON, render the result (for AJAX)
+        echo json_encode($data);
+        // leave this loop step
+        $has_returned = true;
+        break;
+    } else {
+        // block for 1 second
+        sleep(1);
+        continue;
+    }
+  }
+  if (!$has_returned) {
+    echo json_encode(array("timestamp" => $last_change_in_data_files));
+  }
+}
+
+// Open a directory, and read its contents
+// http://www.w3schools.com/php/func_directory_readdir.asp
+function dirFiles($datadir) {
+  $files = array();
+  $creation_timestamps = array();
+  if ($dh = opendir($datadir)) {
+    while (($filename = readdir($dh)) !== false){
+      if (endsWith($filename, ".txt")) {
+        $filepath = $datadir . "/" . $filename;
+        $files[$filename] = file_get_contents($filepath);
+        $creation_timestamps[$filename] = filectime($filepath);
+      }
+    }
+    closedir($dh);
+  }
+  return Array("files" => $files, "creation_timestamps" => $creation_timestamps);
+}
+
+function dirTimestamp($datadir) {
+  // PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
+  clearstatcache();
+  $timestamp = filemtime_precise($datadir . "/.");
+  if ($dh = opendir($datadir)){
+    while (($filename = readdir($dh)) !== false){
+      if (endsWith($filename, ".txt")) {
+        $filepath = $datadir . "/" . $filename;
+        $file_timestamp = filemtime_precise($filepath);
+        if ($file_timestamp > $timestamp) {
+          $timestamp = $file_timestamp;
+        }
+      }
+    }
+    closedir($dh);
+  }
+  return $timestamp;
+}
+
+
+// test if a string ends with another string
+// http://stackoverflow.com/a/619725/2131094
+function endsWith($string, $test) {
+  $strlen = strlen($string);
+  $testlen = strlen($test);
+  if ($testlen > $strlen) return false;
+  return substr_compare($string, $test, $strlen - $testlen, $testlen) === 0;
+}
+
+
+// get precise file modification time (including milliseconds)
+// http://stackoverflow.com/a/20248406/2131094
+function filemtime_precise($path){
+    $dateUnix = @shell_exec('stat --format "%y" \'' . $path . '\'');
+    $date = explode(".", $dateUnix);
+    return (float)(filemtime($path).".".substr(isset($date[1]) ? $date[1] : "00000000", 0, 8));
+}
+
+function cors() {
+    // Allow from any origin
+    if (isset($_SERVER['HTTP_ORIGIN'])) {
+        header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
+        header('Access-Control-Allow-Credentials: true');
+        header('Access-Control-Max-Age: 86400');    // cache for 1 day
+    }
+    // Access-Control headers are received during OPTIONS requests
+    if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
+        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
+            header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS");
+        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
+            header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
+        exit(0);
+    }
+}
+?>