Implement fallback for size field of PageImageType.

Author: dadish

src/Field/PageImage/EmptyPageImage.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace ProcessWire\GraphQL\Field\PageImage;
+
+use ProcessWire\WireData;
+use ProcessWire\WireArray;
+
+class EmptyPageImage extends WireData {
+
+  public function getVariations()
+  {
+    return new WireArray();
+  }
+
+}

src/Field/PageImage/PageImageSizeField.php

@@ -7,6 +7,8 @@
 use Youshido\GraphQL\Type\Scalar\IntType;
 use ProcessWire\GraphQL\Type\Object\PageImageType;
 use Youshido\GraphQL\Execution\ResolveInfo;
+use ProcessWire\GraphQL\Utils;
+use ProcessWire\GraphQL\Field\PageImage\EmptyPageImage;
 
 class PageImageSizeField extends AbstractField{
 
@@ -39,8 +41,26 @@ public function build(FieldConfig $config)
 
   public function resolve($value, array $args, ResolveInfo $info)
   {
+    $canCreate = Utils::moduleConfig()->legalEditFields->has($value->field);
     $width = isset($args['width']) ? $args['width'] : null;
     $height = isset($args['height']) ? $args['height'] : null;
-    return $value->size($width, $height);
+
+    // if there neither width nor heigth is given then we return empty image
+    if (!$width && !$height) return new EmptyPageImage();
+
+    // we create the image if user have rights for it
+    if ($canCreate) return $value->size($width, $height);
+
+    // if user has no rights to create the image then she
+    // might be asking for variation already created
+    $options = [];
+    if ($width) $options['width'] = $width;
+    if ($height) $options['height'] = $height;
+    $thumbs = $value->getVariations($options);
+
+    // If we find the variation then return it
+    // otherwise return empty
+    if ($thumbs->count()) return $thumbs->first();
+    return new EmptyPageImage();
   }
 }

src/Type/InterfaceType/PageFileInterfaceType.php

@@ -53,7 +53,7 @@ public static function getPageFileFields()
         'type' => new StringType(),
         'description' => 'The web accessible URL (with scheme and hostname) to this Pagefile.',
         'resolve' => function ($value) {
-          return (string) $value->httpUrl();
+          return (string) $value->httpUrl;
         }
       ],
 
@@ -133,4 +133,4 @@ public static function getPageFileFields()
   }
 
 
-}
+}