1 files changed, 128 insertions, 0 deletions
diff --git a/pictures/index.php b/pictures/index.php
new file mode 100644
index 0000000..0bee830
--- /dev/null
+++ b/pictures/index.php
@@ -0,0 +1,128 @@
+<?php
+
+$hash = hash("md5", $_SERVER['PHP_SELF']);
+$basedir = sys_get_temp_dir() . "/$hash";
+
+if (!is_dir($basedir))
+  mkdir($basedir);
+
+try {
+  function isValidFileName($filename) {
+    return preg_match("/^[_a-zA-Z0-9]*\.JPG$/i", $filename) == 1;
+  }
+
+  function parseVal($s) {
+    $major = strstr($s, '/', true);
+    $minor = substr(strstr($s, '/'), 1);
+    return intval($major) / intval($minor);
+  }
+
+  function parseDeg($val) {
+    $deg = parseVal($val[0]);
+    $min = parseVal($val[1]);
+    $sec = parseVal($val[2]);
+    return $deg + $min/60 + $sec / 3600;
+  }
+
+  function processFile($filename) {
+    global $basedir;
+    $cacheFile = "$basedir/$filename.geojson";
+
+    if (!isValidFileName($filename)) {
+      throw new InvalidArgumentException("Invalid file name: $filename");
+    }
+
+    if (false && is_readable($cacheFile)) {
+      $s = file_get_contents($cacheFile);
+      if ($s !== false) {
+        return json_decode($s);
+      }
+    }
+
+    $exif = exif_read_data($filename, 0, true);
+    if (!$exif) {
+      throw new InvalidArgumentException("Could not open file: $filename");
+    }
+
+    $json = ["type" => "Feature", "id" => $filename];
+
+    foreach ($exif as $key => $section) {
+      foreach ($section as $name => $val) {
+        switch("$key.$name") {
+          case "FILE.FileSize": $filesize_bytes = $val; break;
+          case "COMPUTED.Height": $height = $val; break;
+          case "COMPUTED.Width": $width = $val; break;
+          case "GPS.GPSLongitude": $lon = parseDeg($val); break;
+          case "GPS.GPSLatitude": $lat = parseDeg($val); break;
+          case "IFD0.Orientation": $orientation = $val; break;
+          case "EXIF.MakerNote":
+          case "EXIF.ComponentsConfiguration":
+          case "GPS.GPSVersion":
+          case "GPS.GPSAltitudeRef":
+            break;
+          default:
+//            echo "$key.$name=$val\n";
+        }
+      }
+    }
+
+    if (isset($lon) && isset($lat)) {
+      $json["geometry"] = [
+        "type" => "Point",
+        "coordinates" => [$lon, $lat]
+      ];
+    }
+
+    $properties = [
+    ];
+    if (isset($filesize_bytes)) {
+      $properties["filesize_bytes"] = $filesize_bytes;
+    }
+    if (isset($height)) {
+      $properties["height_px"] = $height;
+    }
+    if (isset($width)) {
+      $properties["width_px"] = $width;
+    }
+    if (isset($orientation)) {
+      switch ($orientation) {
+        case 1:
+          $properties["orientation"] = 0;
+        case 3:
+          $properties["orientation"] = -180;
+        case 6:
+          $properties["orientation"] = 90;
+        case 8:
+          $properties["orientation"] = -90;
+      }
+    }
+    $json["properties"] = $properties;
+
+    $s = json_encode($json);
+    file_put_contents($cacheFile, $s);
+
+    return $json;
+  }
+
+  if (!isset($_GET["file"])) {
+    $d = dir(".");
+    $features = [];
+    while (false !== ($entry = $d->read())) {
+      if(!isValidFilename($entry)) {
+        continue;
+      }
+      array_push($features, processFile($entry));
+    }
+    $json = ["type" => "FeatureCollection", "features" => $features];
+  } else {
+    $filename = $_GET["file"];
+    $json = processFile($filename);
+  }
+
+  header('Content-Type: application/vnd.geo+json');
+  echo json_encode($json, JSON_PRETTY_PRINT);
+  echo "\n";
+} catch(InvalidArgumentException $e) {
+  header('HTTP/1.1 400 bad request');
+}
+?>