Adding gmap_arcgis_mapserver() proxy cache

1 files changed, 68 insertions, 0 deletions

diff --git a/gmap_arcgis.module b/gmap_arcgis.module
index 76b667e..3387dd7 100644
--- a/gmap_arcgis.module
+++ b/gmap_arcgis.module
@@ -242,3 +242,71 @@ function gmap_arcgis_link_nota_tecnica() {
 
   return l(t('Sources'), 'quem-somos', array('fragment' => 'tabset-tab-3', 'external' => TRUE));
 }
+
+/**
+ * Implementation of hook_menu().
+ */
+function gmap_arcgis_menu() {
+  $items['gmap_arcgis/mapserver'] = array(
+    'title'            => 'MapServer Proxy',
+    'description'      => 'Caches requests to a MapServer',
+    'page callback'    => 'gmap_arcgis_mapserver',
+    'access arguments' => array('access content'),
+    'type'             => MENU_CALLBACK,
+  );
+
+  return $items;
+}
+
+/**
+ * Menu callback.
+ *
+ * Caches dynamic ArcGIS requests by ignoring the timestamp pattern.
+ */
+function gmap_arcgis_mapserver() {
+  header('Content-Type: text/plain;charset=utf-8');
+
+  // The ArcGIS server URL.
+  $base    = 'http://gis2.socioambiental.org:8399/arcgis/rest/services/';
+
+  // The dynamic pattern we want to exclude.
+  $pattern = '/_[0-9]*._callback/';
+
+  $dynamic = FALSE;
+  $request = $_SERVER['argv'][0];
+  $query   = str_replace('q=gmap_arcgis/mapserver/', '', $request);
+  $query   = preg_replace('/&/', '?', $query, 1);
+  $dest    = $base . $query;
+  $process = curl_init($dest);
+
+  if (preg_match($pattern, $dest, $timestamp) == 1) {
+    $dynamic = TRUE;
+    $key     = sha1(preg_replace($pattern, '', $dest));
+  }
+  else {
+    $key = sha1($dest);
+  }
+
+  $data = cache_get($key, 'cache_page');
+
+  if ($data == 0) {
+    curl_setopt($process, CURLOPT_TIMEOUT, 30);
+    curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);
+
+    $return = curl_exec($process);
+    curl_close($process);
+
+    cache_set($key, $return, 'cache_page', CACHE_TEMPORARY);
+  }
+  else {
+    $return = $dynamic == TRUE ? preg_replace($pattern, $timestamp[0], $data->data) : $data->data;
+
+    // Cache expiration.
+    if ($data->created < time() - 1800) {
+      cache_clear_all($key, 'cache_page');
+    }
+  }
+
+  echo $return;
+  exit;
+}