Add a new FieldtypeHasFiles interface and update FieldtypeFile and FieldtypeImage to implement it. This interface is intended to be implemented by any Fieldtype that works with files to provide a common interface among them.

wire/core/Interfaces.php

@@ -166,6 +166,42 @@ interface WireTrackable {
  */
 interface FieldtypePageTitleCompatible { }
 
+/**
+ * Indicates Fieldtype manages files
+ *
+ */
+interface FieldtypeHasFiles {
+	/**
+	 * Whether or not given Page/Field has any files connected with it
+	 * 
+	 * @param Page $page
+	 * @param Field $field
+	 * @return bool
+	 * 
+	 */
+	public function hasFiles(Page $page, Field $field);
+	
+	/**
+	 * Get array of full path/file for all files managed by given page and field
+	 * 
+	 * @param Page $page
+	 * @param Field $field
+	 * @return array
+	 * 
+	 */
+	public function getFiles(Page $page, Field $field);
+
+	/**
+	 * Get path where files are (or would be) stored
+	 * 
+	 * @param Page $page
+	 * @param Field $field
+	 * @return string
+	 * 
+	 */
+	public function getFilesPath(Page $page, Field $field); 
+}
+
 
 /**
  * Indicates that an Inputfield provides tree selection capabilities

wire/modules/Fieldtype/FieldtypeFile/FieldtypeFile.module

@@ -18,7 +18,7 @@
  *
  */
 
-class FieldtypeFile extends FieldtypeMulti implements ConfigurableModule {
+class FieldtypeFile extends FieldtypeMulti implements ConfigurableModule, FieldtypeHasFiles {
 	
 	public static function getModuleInfo() {
 		return array(
@@ -1580,6 +1580,59 @@ class FieldtypeFile extends FieldtypeMulti implements ConfigurableModule {
 			'validators' => $validators, // file validators in use indexed by file extension
 		);
 	}
+	
+	/**
+	 * Whether or not given Page/Field has any files connected with it 
+	 * 
+	 * #pw-internal For FieldtypeHasFiles interface
+	 *
+	 * @param Page $page
+	 * @param Field $field
+	 * @return bool
+	 * @since 3.0.181
+	 *
+	 */
+	public function hasFiles(Page $page, Field $field) {
+		if(!$field->type instanceof FieldtypeFile) return false;
+		$value = $page->get($field->name);
+		return ($value instanceof Pagefile || ($value instanceof Pagefiles && $value->count() > 0));
+	}
+
+	/**
+	 * Get array of full path/file for all files managed by given page and field
+	 * 
+	 * #pw-internal For FieldtypeHasFiles interface
+	 *
+	 * @param Page $page
+	 * @param Field $field
+	 * @return array
+	 * @since 3.0.181
+	 *
+	 */
+	public function getFiles(Page $page, Field $field) {
+		$value = $page->get($field->name); 
+		if($value instanceof Pagefile) {
+			/** @var Pagefile $value */
+			return array($value->filename());
+		}
+		if($value instanceof Pagefiles && $value->count()) {
+			/** @var Pagefiles $value */
+			return $value->explode('filename');
+		}
+		return array();
+	}
+	
+	/**
+	 * Get path where files are (or would be) stored
+	 *
+	 * @param Page $page
+	 * @param Field $field
+	 * @return string
+	 *
+	 */
+	public function getFilesPath(Page $page, Field $field) {
+		return PagefilesManager::_path($page);
+	}
 
 	/**
 	 * Field config

wire/modules/Fieldtype/FieldtypeImage/FieldtypeImage.module

@@ -15,7 +15,7 @@
  *
  */
 
-class FieldtypeImage extends FieldtypeFile {
+class FieldtypeImage extends FieldtypeFile implements FieldtypeHasFiles {
 	
 	/**
 	 * File schema is configured to store dimensions for image files 'width', 'height', 'ratio' (flag)
@@ -228,6 +228,41 @@ class FieldtypeImage extends FieldtypeFile {
 		return $value; 	
 	}
 	
+	/**
+	 * Get array of full path/file for all files managed by given page and field (also includes image variations)
+	 *
+	 * #pw-internal For FieldtypeHasFiles interface
+	 *
+	 * @param Page $page
+	 * @param Field $field
+	 * @return array
+	 * @since 3.0.181
+	 *
+	 */
+	public function getFiles(Page $page, Field $field) {
+		
+		$value = $page->get($field->name);
+		$files = array();
+		
+		if($value instanceof Pageimage) {
+			$value = array($value);
+		} else if(!$value instanceof Pageimages) {
+			return array();
+		}
+		
+		foreach($value as $pageimage) {
+			$file = $pageimage->filename();
+			$path = dirname($file) . '/';
+			$files[] = $file;
+			$variations = $pageimage->getVariations(array('info' => true, 'verbose' => false));
+			foreach($variations as $basename) {
+				$files[] = $path . $basename;
+			}
+		}
+		
+		return $files;
+	}
+	
 	/**
 	 * Get Inputfields to configure fields using this Fieldtype
 	 *