From 0549800afeb7b8db389d79a9fd48feecf875ab23 Mon Sep 17 00:00:00 2001
From: steckbrief <steckbrief@chefmail.de>
Date: Mon, 12 Dec 2016 12:58:12 +0100
Subject: Error handling improved, logging included

---
 src/config/config.inc.php      | 10 +++++
 src/lib/error.handler.inc.php  | 44 ++++++++++++++++++++++
 src/lib/functions.http.inc.php | 83 ++++++++++++++++++++++++++++++++++++++++++
 src/loadArtifact.php           | 34 +++++++++++++++++
 src/mvncache.php               | 63 ++++++++++++++++++++++----------
 5 files changed, 215 insertions(+), 19 deletions(-)
 create mode 100644 src/config/config.inc.php
 create mode 100644 src/lib/error.handler.inc.php
 create mode 100644 src/lib/functions.http.inc.php
 create mode 100644 src/loadArtifact.php

diff --git a/src/config/config.inc.php b/src/config/config.inc.php
new file mode 100644
index 0000000..ac61c27
--- /dev/null
+++ b/src/config/config.inc.php
@@ -0,0 +1,10 @@
+<?php
+/*
+ * Configuration file for mvn cache
+ */
+ 
+return [
+  'mavenBaseUrls' => ['http://repo1.maven.org/maven2', ],
+  'logfile' => 'logs/mvncache.log',
+];
+?>
\ No newline at end of file
diff --git a/src/lib/error.handler.inc.php b/src/lib/error.handler.inc.php
new file mode 100644
index 0000000..9518e4b
--- /dev/null
+++ b/src/lib/error.handler.inc.php
@@ -0,0 +1,44 @@
+<?php
+
+function initTheDevStackErrorHandler($logfile) {
+  // Save the log file name to constant for the error handler
+  define("LOGFILE", $logfile);
+  // Custom error handler that writes to a file
+  set_error_handler("theDevStackErrorHandler");
+}
+
+/**
+ * Error handler to write all messages to a dedicated log file.
+ */
+function theDevStackErrorHandler($errno, $errstr, $errfile, $errline) {
+    if (!(error_reporting() & $errno)) {
+        // This error code is not included in error_reporting
+        return;
+    }
+    $date = date(DATE_W3C);
+    $str = "$date ";
+
+    switch ($errno) {
+        case E_USER_ERROR:
+            $str .= "ERROR [$errno]: $errstr, Fatal error on line $errline in file $errfile\n";
+            break;
+
+        case E_USER_WARNING:
+            $str .= "WARNING [$errno]: $errstr\n";
+            break;
+
+        case E_USER_NOTICE:
+            $str .= "NOTICE [$errno]: $errstr\n";
+            break;
+
+        default:
+            $str .= "Unknown error type: [$errno] $errstr\n";
+            break;
+    }
+
+    file_put_contents(LOGFILE, $str, FILE_APPEND);
+
+    /* Don't execute PHP internal error handler */
+    return true;
+}
+?>
\ No newline at end of file
diff --git a/src/lib/functions.http.inc.php b/src/lib/functions.http.inc.php
new file mode 100644
index 0000000..44296b5
--- /dev/null
+++ b/src/lib/functions.http.inc.php
@@ -0,0 +1,83 @@
+<?php
+/*
+ *
+ * This file contains functions to be used to
+ * extract information based on http request information.
+ *
+ */
+ 
+/**
+ * Inspired by https://github.com/owncloud/core/blob/master/lib/private/appframework/http/request.php#L523
+ */
+function getServerProtocol() {
+  if (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
+      if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], ',') !== false) {
+          $parts = explode(',', $_SERVER['HTTP_X_FORWARDED_PROTO']);
+          $proto = strtolower(trim($parts[0]));
+      } else {
+          $proto = strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']);
+      }
+      // 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'
+      && $_SERVER['HTTPS'] !== '') {
+      return 'https';
+  }
+  return 'http';
+}
+
+function getRequestHostname() {
+  if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
+    return strtolower($_SERVER['HTTP_X_FORWARDED_HOST']);
+  }
+  return strtolower($_SERVER['HTTP_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' => $data];
+  }
+  header('Content-Type: application/json');
+  sendHttpReturnCodeAndMessage($code, json_encode($data));
+}
+
+function sendHttpReturnCodeAndMessage($code, $text = '') {
+  http_response_code($code);
+  exit($text);
+}
+
+function getOptionalPostParameter($parameterName, $default = NULL) {
+  $parameter = $_POST[$parameterName];
+  if (!isset($parameter) || is_null($parameter) || empty($parameter)) {
+    $parameter = $default;
+  }
+  return $parameter;
+}
+
+function getMandatoryPostParameter($parameterName, $message = '', $json = false) {
+  $parameter = $_POST[$parameterName];
+  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 $parameter;
+}
+?>
\ No newline at end of file
diff --git a/src/loadArtifact.php b/src/loadArtifact.php
new file mode 100644
index 0000000..6205164
--- /dev/null
+++ b/src/loadArtifact.php
@@ -0,0 +1,34 @@
+<?php
+$mvnBaseUrl = 'http://repo1.maven.org/maven2';
+
+$requestedArtifact = $_SERVER["REQUEST_URI"];
+$requestedArtifact = str_replace('/mvn', '', $requestedArtifact);
+$baseLocalFolder = __DIR__;
+$localFolder = $baseLocalFolder.substr($requestedArtifact, 0, strripos($requestedArtifact, '/'));
+//echo $localFolder."<br>";
+if (!is_dir($localFolder)) {
+  mkdir($localFolder, 0770, true);
+}
+
+$srcUrl = $mvnBaseUrl.$requestedArtifact;
+//echo $srcUrl."<br>";
+$src = fopen($srcUrl, 'r');
+
+$dstPath = $baseLocalFolder.$requestedArtifact;
+//echo $dstPath;
+$dst = fopen($dstPath, 'w');
+
+$filesize = stream_copy_to_stream($src, $dst);
+
+if (0 == $filesize) {
+  unlink($dstPath);
+  unlink($localFolder);
+}
+
+if (is_file($dstPath)) {
+  chmod($dstPath, 0660);
+  header('Location: http://'.$_SERVER["HTTP_HOST"].$_SERVER["REQUEST_URI"]);
+} else {
+  header('HTTP/1.0 404 Not Found');
+}
+?>
diff --git a/src/mvncache.php b/src/mvncache.php
index d296a4f..ef75a16 100644
--- a/src/mvncache.php
+++ b/src/mvncache.php
@@ -1,29 +1,54 @@
 <?php
-$mvnBaseUrl = 'http://repo1.maven.org/maven2';
+
+include_once(__DIR__.'/lib/functions.http.inc.php');
+include_once(__DIR__.'/lib/error.handler.inc.php');
+// Load configuration
+$config = require(__DIR__.'/config/config.inc.php');
+
+initTheDevStackErrorHandler($config["logfile"]);
 
 $requestedArtifact = $_SERVER["REQUEST_URI"];
 $requestedArtifact = str_replace('/mvn', '', $requestedArtifact);
-$baseLocalFolder = __DIR__;
+$baseLocalFolder = __DIR__.'/..';
 $localFolder = $baseLocalFolder.substr($requestedArtifact, 0, strripos($requestedArtifact, '/'));
-//echo $localFolder."<br>";
-if (!is_dir($localFolder)) {
-  mkdir($localFolder, 0770, true);
-}
 
-$srcUrl = $mvnBaseUrl.$requestedArtifact;
-//echo $srcUrl."<br>";
-$src = fopen($srcUrl, 'r');
-
-$dstPath = $baseLocalFolder.$requestedArtifact;
-//echo $dstPath;
-$dst = fopen($dstPath, 'w');
-
-stream_copy_to_stream($src, $dst);
+$tempFile = tmpfile();
+foreach ($config['mavenBaseUrls'] as $mvnBaseUrl) {
+  $srcUrl = $mvnBaseUrl.$requestedArtifact;
+  //echo $srcUrl."<br>";
+  $src = fopen($srcUrl, 'r');
+  $found = FALSE !== $src;
+  
+  if ($found) {
+    $filesize = @stream_copy_to_stream($src, $tempFile);
+    $found = 0 < $filesize;
+  }
+  if ($found) {
+    trigger_error("Artifact found at $srcUrl", E_USER_NOTICE);
+    break;
+  } else {
+    trigger_error("Artifact NOT found at $srcUrl", E_USER_WARNING);
+  }
+}
 
-if (is_file($dstPath)) {
-  chmod($dstPath, 0660);
-  header('Location: http://'.$_SERVER["HTTP_HOST"].$_SERVER["REQUEST_URI"]);
+if (!$found) {
+  trigger_error("Artifact NOT found at any source", E_USER_WARNING);
+  sendHttpReturnCodeAndMessage(404, 'Not found');
 } else {
-  header('HTTP/1.0 404 Not Found');
+  //echo $localFolder."<br>";
+  if (!is_dir($localFolder)) {
+    mkdir($localFolder, 0770, true);
+  }
+  $dstPath = $baseLocalFolder.$requestedArtifact;
+  //echo $dstPath;
+  $dst = fopen($dstPath, 'w');
+  fseek($tempFile, 0);
+  stream_copy_to_stream($tempFile, $dst);
+  if (is_file($dstPath)) {
+    chmod($dstPath, 0660);
+    header('Location: http://'.$_SERVER["HTTP_HOST"].$_SERVER["REQUEST_URI"]);
+  } else {
+    header('HTTP/1.0 404 Not Found');
+  }
 }
 ?>
-- 
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