From 03cf2a22fe227633cf901dc1d9cf1024b8d07b59 Mon Sep 17 00:00:00 2001
From: steckbrief <steckbrief@chefmail.de>
Date: Sat, 25 Nov 2017 23:30:49 +0100
Subject: Initial commit

---
 functions.common.inc.php |  40 +++++++++++++
 functions.http.inc.php   | 145 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 185 insertions(+)
 create mode 100644 functions.common.inc.php
 create mode 100644 functions.http.inc.php

diff --git a/functions.common.inc.php b/functions.common.inc.php
new file mode 100644
index 0000000..5be37b6
--- /dev/null
+++ b/functions.common.inc.php
@@ -0,0 +1,40 @@
+<?php
+/*
+ * This file contains functions commonly used.
+ */
+
+/**
+ * Copied from http://rogerstringer.com/2013/11/15/generate-uuids-php/
+ */ 
+function generate_uuid() {
+  return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+    mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
+    mt_rand( 0, 0xffff ),
+    mt_rand( 0, 0x0fff ) | 0x4000,
+    mt_rand( 0, 0x3fff ) | 0x8000,
+    mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
+  );
+}
+
+function format_size($size, $precision = 2) {
+  $sizes = ['bytes', 'Kb', 'Mb', 'Gb', 'Tb'];
+  $i = 0;
+  while (1023 < $size && $i < count($sizes) - 1) {
+    $size /= 1023;
+    ++$i;
+  }
+
+  return number_format($size, $precision).' '.$sizes[$i];
+}
+
+function startsWith($haystack, $needle) {
+     $length = strlen($needle);
+     return (substr($haystack, 0, $length) === $needle);
+}
+
+function endsWith($haystack, $needle) {
+    $length = strlen($needle);
+
+    return $length === 0 || (substr($haystack, -$length) === $needle);
+}
+?>
diff --git a/functions.http.inc.php b/functions.http.inc.php
new file mode 100644
index 0000000..234e404
--- /dev/null
+++ b/functions.http.inc.php
@@ -0,0 +1,145 @@
+<?php
+/*
+ *
+ * This file contains functions to be used to
+ * extract information based on http request information.
+ *
+ */
+ 
+require_once('functions.common.inc.php');
+
+/**
+ * Inspired by https://github.com/owncloud/core/blob/master/lib/private/appframework/http/request.php#L523
+ */
+function getServerProtocol() {
+    $protocol = getHeaderExtensionValue('FORWARDED_PROTO');
+    if (isset($protocol)) {
+        if (strpos($protocol, ',') !== false) {
+            $parts = explode(',', $protocol);
+            $proto = strtolower(trim($parts[0]));
+        } else {
+            $proto = strtolower($protocol);
+        }
+        // Verify that the protocol is always HTTP or HTTPS
+        // default to http if an invalid value is provided
+        return $proto === 'https' ? 'https' : 'http';
+    }
+    if (isset($_SERVER['HTTPS'])
+        && $_SERVER['HTTPS'] !== null
+        && $_SERVER['HTTPS'] !== 'off'
+        && $_SERVER['HTTPS'] !== '') {
+        return 'https';
+    }
+    return 'http';
+}
+
+function getRequestHostname() {
+    $forwardedHost = getHeaderExtensionValue('FORWARDED_HOST');
+    if (isset($forwardedHost)) {
+        return strtolower($forwardedHost);
+    }
+    return strtolower(getHeaderValue('HOST'));
+}
+
+function getRequestUriWithoutFilename() {
+    return strtolower(substr($_SERVER['REQUEST_URI'], 0, strrpos($_SERVER['REQUEST_URI'], '/') + 1));
+}
+
+function sendHttpReturnCodeAndJson($code, $data) {
+    if (!is_array($data)) {
+        $data = ['msg' => $data];
+    }
+    
+    setContentType('application/json');
+    
+    sendHttpReturnCodeAndMessage($code, json_encode($data));
+}
+
+function sendHttpReturnCodeAndMessage($code, $text = '') {
+    http_response_code($code);
+    exit($text);
+}
+
+function setContentType($contentType) {
+    header('Content-Type: '.$contentType);
+}
+
+function getHeaderExtensionValue($headerName) {
+    $headerName = strtoupper($headerName);
+    if (!startsWith('HTTP_X_') {
+        if (!startsWith('HTTP_') {
+            $headerName = str_replace('HTTP_', 'HTTP_X_', $headerName);
+        } else {
+            $headerName = 'HTTP_X_'.$headerName;
+        }
+    }
+    
+    return getHeaderValue($headerName);
+}
+
+function getHeaderValue($headerName) {
+    $headerName = strtoupper($headerName);
+    if (!startsWith('HTTP_') {
+        $headerName = 'HTTP_'.$headerName;
+    }
+    
+    return $_SERVER[$headerName];
+}
+
+function getPostParameter($parameterName) {
+    return $_POST[$parameterName];
+}
+
+function getOptionalPostParameter($parameterName, $default = NULL) {
+    $parameter = getPostParameter($parameterName);
+    
+    return handleOptionalParameter($parameter, $default);
+}
+
+function getMandatoryPostParameter($parameterName, $message = '', $json = false) {
+    $parameter = getPostParameter($parameterName);
+    
+    return handleMandatoryParameter($parameter, $message, $json);
+}
+
+function getGetParameter($parameterName) {
+    return $_GET[$parameterName];
+}
+
+function getOptionalGetParameter($parameterName, $default = NULL) {
+    $parameter = getPostParameter($parameterName);
+    
+    return handleOptionalParameter($parameter, $default);
+}
+
+function getMandatoryGetParameter($parameterName, $message = '', $json = false) {
+    $parameter = getGetParameter($parameterName);
+    
+    return handleMandatoryParameter($parameter, $message, $json);
+}
+
+function handleOptionalParameter($parameter, $default) {
+    if (!isset($parameter) || is_null($parameter) || empty($parameter)) {
+        $parameter = $default;
+    }
+    return $parameter;
+}
+
+function handleMandatoryParameter($parameter, $message, $json) {
+    if (!isset($parameter) || is_null($parameter) || empty($parameter)) {
+        if (empty($message)) {
+            if ($json) {
+                $message = ['msg' => 'Missing parameter.', 'parameters' => ['missing_parameter' => $parameterName]];
+            } else {
+                $message = 'Missing mandatory parameter "'.$parameterName.'".';
+            }
+        }
+        if (!$json) {
+            sendHttpReturnCodeAndMessage(400, $message);
+        } else {
+            sendHttpReturnCodeAndJson(400, $message);
+        }
+    }
+    return $parameter;
+}
+?>
-- 
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