Copy field values from other sites

CHANGELOG-WIP.md

@@ -1,6 +1,7 @@
 # Release notes for Craft CMS 5.6 (WIP)
 
 ### Content Management
+- It’s now possible to copy custom field values from other sites. ([#14056](https://github.com/craftcms/cms/pull/14056))
 - “Related To”, “Not Related To”, “Author”, and relational field condition rules now allow multiple elements to be specified. ([#16121](https://github.com/craftcms/cms/discussions/16121))
 - Improved the styling of inline code fragments. ([#16141](https://github.com/craftcms/cms/pull/16141))
 - Improved the styling of attribute previews in card view. ([#16324](https://github.com/craftcms/cms/pull/16324))
@@ -13,7 +14,7 @@
 - Entry indexes now only show table column options and sort options for custom fields associated with the selected sections/entry types within custom entry sources’ conditions.
 - Structure views are now available to element indexes on mobile browsers. ([#16190](https://github.com/craftcms/cms/discussions/16190))
 - Datepickers now include a dropdown menu for selecting the year. ([#16376](https://github.com/craftcms/cms/pull/16376))
-- Custom fields within element edit pages can now have action menus with “Edit field” and “Copy field handle” items. ([#16415](https://github.com/craftcms/cms/pull/16415))
+- Custom fields within element edit pages can now have action menus with “Copy value from site…”, “Edit field” and “Copy field handle” items. ([#16415](https://github.com/craftcms/cms/pull/16415), [#14056](https://github.com/craftcms/cms/pull/14056))
 - Heads-up displays now reposition themselves on window scroll.
 
 ### Accessibility
@@ -24,6 +25,7 @@
 - Improved the accessibility of action menus on the Plugins index page.
 - Improved the accessibility of “More” and “Advanced” toggle triggers. ([#16293]](https://github.com/craftcms/cms/pull/16293))
 - Improved the accessibility of the Craft Support widget. ([#16293]](https://github.com/craftcms/cms/pull/16293))
+- Improved the accessibility of field translatable indicators and tooltips.
 
 ### Administration
 - Added the “Affiliated Site” native user field. ([#16174](https://github.com/craftcms/cms/pull/16174))
@@ -121,6 +123,10 @@
 - Added `craft\web\User::setImpersonatorId()`.
 - Added `craft\web\View::setTwig()`.
 - Added `craft\web\twig\variables\Cp::EVENT_REGISTER_READ_ONLY_CP_SETTINGS`. ([#16265](https://github.com/craftcms/cms/pull/16265))
+- Added `craft\base\CrossSiteCopyableFieldInterface`. ([#14056](https://github.com/craftcms/cms/pull/14056))
+- Added `craft\base\ElementInterface::getIsCrossSiteCopyable()`. ([#14056](https://github.com/craftcms/cms/pull/14056))
+- Added `craft\base\Field::copyCrossSiteValue()`. ([#14056](https://github.com/craftcms/cms/pull/14056))
+- Added `craft\fieldlayoutelements\BaseField::isCrossSiteCopyable()`.
 - `GuzzleHttp\Client` is now instantiated via `Craft::createObject()`. ([#16366](https://github.com/craftcms/cms/pull/16366))
 - `craft\elements\NestedElementManager::getIndexHtml()` now supports passing `defaultSort` in the `$config` array. ([#16236](https://github.com/craftcms/cms/discussions/16236))
 - `craft\elements\conditions\entries\MatrixFieldConditionRule` is now an alias of `FieldConditionRule`.

packages/craftcms-sass/_mixins.scss

@@ -190,10 +190,10 @@ $menuBorderRadius: $mediumBorderRadius;
     sans-serif;
 }
 
-@mixin fixed-width-font {
+@mixin fixed-width-font($size: 0.9em) {
   font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier,
     monospace;
-  font-size: 0.9em !important;
+  font-size: $size !important;
 }
 
 @function toRem($values...) {

packages/craftcms-webpack/Craft.d.ts

@@ -13,14 +13,24 @@ interface ProgressBarInterface {
   showProgressBar(): void;
 }
 
+type Site = {
+  handle: string;
+  id: number;
+  name: string;
+  uid: string;
+};
+
 // Declare existing variables, mock the things we'll use.
 declare var Craft: {
+  csrfTokenName?: string;
+  csrfTokenValue?: string;
   ProgressBar: ProgressBarInterface;
   t(category: string, message: string, params?: object): string;
   sendActionRequest(method: string, action: string, options?: object): Promise;
   initUiElements($container: JQuery): void;
   expandPostArray(arr: object): any;
   escapeHtml(str: string);
+  sites: Site[];
   Preview: any;
   cp: any;
 };

src/base/CrossSiteCopyableFieldInterface.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * @link https://craftcms.com/
+ * @copyright Copyright (c) Pixel & Tonic, Inc.
+ * @license https://craftcms.github.io/license/
+ */
+
+namespace craft\base;
+
+/**
+ * CrossSiteCopyableFieldInterface defines the common interface to be implemented by field classes
+ * that wish to support copying their values between sites in a multisite installation.
+ *
+ * @author Pixel & Tonic, Inc. <[email protected]>
+ * @since 5.6.0
+ */
+interface CrossSiteCopyableFieldInterface
+{
+    /**
+     * Copies the field’s value from one site to another.
+     *
+     * @param ElementInterface $from
+     * @param ElementInterface $to
+     */
+    public function copyCrossSiteValue(ElementInterface $from, ElementInterface $to): void;
+}

src/base/Element.php

@@ -2437,6 +2437,12 @@ private static function _indexOrderByColumns(
      */
     private $_serializeFields = false;
 
+    /**
+     * @var bool
+     * @see getIsCrossSiteCopyable()
+     */
+    private bool $_isCrossSiteCopyable;
+
     /**
      * @inheritdoc
      */
@@ -5485,6 +5491,24 @@ public function getCurrentRevision(): ?ElementInterface
         return $this->_currentRevision ?: null;
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function getIsCrossSiteCopyable(): bool
+    {
+        if (!isset($this->_isCrossSiteCopyable)) {
+            $this->_isCrossSiteCopyable = (
+                Craft::$app->getIsMultiSite() &&
+                // check if user can edit this element in other sites
+                count(ElementHelper::editableSiteIdsForElement($this)) > 1 &&
+                // also check if the element exists in other sites
+                !empty(array_diff(array_keys(ElementHelper::siteStatusesForElement($this, true)), [$this->siteId]))
+            );
+        }
+
+        return $this->_isCrossSiteCopyable;
+    }
+
     // Indexes, etc.
     // -------------------------------------------------------------------------
 

src/base/ElementInterface.php

@@ -1670,6 +1670,16 @@ public function setRevisionNotes(?string $notes): void;
      */
     public function getCurrentRevision(): ?self;
 
+    /**
+     * Return if the element is copyable between sites.
+     * Checks if it's a multisite installation, if user can edit the element in other sites,
+     * and if the element actually exists in other sites.
+     *
+     * @return bool
+     * @since 5.6.0
+     */
+    public function getIsCrossSiteCopyable(): bool;
+
     // Indexes, etc.
     // -------------------------------------------------------------------------
 

src/base/Field.php

@@ -961,6 +961,15 @@ public function copyValue(ElementInterface $from, ElementInterface $to): void
         $to->setFieldValue($this->handle, $value);
     }
 
+    /**
+     * @see CrossSiteCopyableFieldInterface::copyCrossSiteValue()
+     * @since 5.6.0
+     */
+    public function copyCrossSiteValue(ElementInterface $from, ElementInterface $to): void
+    {
+        $this->copyValue($from, $to);
+    }
+
     /**
      * @inheritdoc
      */

src/controllers/ElementsController.php

@@ -26,6 +26,7 @@
 use craft\events\DefineElementEditorHtmlEvent;
 use craft\events\DraftEvent;
 use craft\fieldlayoutelements\BaseField;
+use craft\fieldlayoutelements\CustomField;
 use craft\fields\Matrix;
 use craft\helpers\ArrayHelper;
 use craft\helpers\Component;
@@ -483,6 +484,74 @@ public function actionEdit(?ElementInterface $element, ?int $elementId = null):
         return $response;
     }
 
+    /**
+     * Copies field/attribute values on an element from one site to another.
+     *
+     * @return Response
+     * @since 5.6.0
+     */
+    public function actionCopyValuesFromSite(): Response
+    {
+        $this->requireCpRequest();
+
+        /** @var Element|Response|null $element */
+        $element = $this->_element(checkForProvisionalDraft: true);
+
+        if ($element instanceof Response) {
+            return $element;
+        }
+
+        if (!$element || $element->getIsRevision()) {
+            throw new BadRequestHttpException('No element was identified by the request.');
+        }
+
+        $copyFromSiteId = (int)$this->request->getRequiredBodyParam('fromSiteId');
+        $this->requirePermission("editSite:$copyFromSiteId");
+
+        $layoutElementUid = $this->request->getRequiredBodyParam('layoutElementUid');
+        $namespace = $this->request->getBodyParam('namespace');
+
+        $fromElement = $element::find()
+            ->id($element->id)
+            ->structureId($element->structureId)
+            ->siteId($copyFromSiteId)
+            ->drafts(null)
+            ->provisionalDrafts(null)
+            ->one();
+
+        if (!$fromElement) {
+            throw new UnsupportedSiteException($element, $copyFromSiteId, 'Attempting to copy element content from an unsupported site.');
+        }
+
+        $layoutElement = $element->getFieldLayout()->getElementByUid($layoutElementUid);
+        if (!$layoutElement instanceof BaseField || !$layoutElement->isCrossSiteCopyable($element)) {
+            throw new BadRequestHttpException("Invalid layout element UUID: $layoutElementUid");
+        }
+        if ($layoutElement instanceof CustomField) {
+            $layoutElement->getField()->copyCrossSiteValue($fromElement, $element);
+        } else {
+            $attribute = $layoutElement->attribute();
+            $element->$attribute = $fromElement->$attribute;
+        }
+
+        $view = $this->getView();
+        $html = $view->namespaceInputs(fn() => $layoutElement->formHtml($element), $namespace);
+
+        if ($html) {
+            $html = Html::modifyTagAttributes($html, [
+                'data' => [
+                    'layout-element' => $layoutElement->uid,
+                ],
+            ]);
+        }
+
+        return $this->_asSuccess(Craft::t('app', 'Field value copied.'), $element, [
+            'fieldHtml' => $html,
+            'headHtml' => $view->getHeadHtml(),
+            'bodyHtml' => $view->getBodyHtml(),
+        ]);
+    }
+
     /**
      * Returns an element revisions index screen.
      *
@@ -2279,6 +2348,9 @@ private function _elementById(
                 ->siteId($siteId)
                 ->preferSites($preferSites)
                 ->unique()
+                ->drafts(null)
+                ->provisionalDrafts(null)
+                ->revisions(null)
                 ->status(null)
                 ->one();
 

src/fieldlayoutelements/BaseField.php

@@ -373,6 +373,40 @@ public function formHtml(?ElementInterface $element = null, bool $static = false
         $instructions = $this->instructions($element, $static);
         $tip = $this->tip($element, $static);
         $warning = $this->warning($element, $static);
+        $translatable = $this->translatable($element, $static);
+        $actionMenuItems = $this->actionMenuItems($element, $static);
+
+        if (
+            $this->uid &&
+            $element?->id &&
+            !$static &&
+            $this->isCrossSiteCopyable($element) &&
+            $this->translatable($element, $static) &&
+            $element->getIsCrossSiteCopyable()
+        ) {
+            // prepare namespace for the purpose of copying
+            $namespace = Craft::$app->getView()->getNamespace();
+
+            $actionMenuItems = array_filter([
+                [
+                    'icon' => 'clone',
+                    'label' => Craft::t('app', 'Copy value from site…'),
+                    'attributes' => [
+                        'data' => [
+                            'cross-site-copy' => true,
+                            'element-id' => $element->id,
+                            'layout-element' => $this->uid,
+                            'label' => $label,
+                            'namespace' => ($namespace && $namespace !== 'field')
+                                ? StringHelper::removeRight($namespace, '[fields]')
+                                : null,
+                        ],
+                    ],
+                ],
+                !empty($actionMenuItems) ? ['type' => 'hr'] : null,
+                ...$actionMenuItems,
+            ]);
+        }
 
         return Cp::fieldHtml($inputHtml, [
             'fieldset' => $this->useFieldset(),
@@ -395,9 +429,9 @@ public function formHtml(?ElementInterface $element = null, bool $static = false
             'tip' => $tip !== null ? Html::encode($tip) : null,
             'warning' => $warning !== null ? Html::encode($warning) : null,
             'orientation' => $this->orientation($element, $static),
-            'translatable' => $this->translatable($element, $static),
+            'translatable' => $translatable,
             'translationDescription' => $this->translationDescription($element, $static),
-            'actionMenuItems' => $this->actionMenuItems(),
+            'actionMenuItems' => $actionMenuItems,
             'errors' => !$static ? $this->errors($element) : [],
         ]);
     }
@@ -780,15 +814,28 @@ protected function translationDescription(?ElementInterface $element = null, boo
         return null;
     }
 
+    /**
+     * Returns whether field supports copying its value across sites.
+     *
+     * @param ElementInterface $element
+     * @return bool
+     */
+    public function isCrossSiteCopyable(ElementInterface $element): bool
+    {
+        return false;
+    }
+
     /**
      * Returns any action menu items that should be shown for the field.
      *
-     *  See [[\craft\helpers\Cp::disclosureMenu()]] for documentation on supported item properties.
+     * See [[\craft\helpers\Cp::disclosureMenu()]] for documentation on supported item properties.
      *
+     * @param ElementInterface|null $element The element the form is being rendered for
+     * @param bool $static Whether the form should be static (non-interactive)
      * @return array
      * @since 5.6.0
      */
-    protected function actionMenuItems(): array
+    protected function actionMenuItems(?ElementInterface $element = null, bool $static = false): array
     {
         return [];
     }

src/fieldlayoutelements/CustomField.php

@@ -9,6 +9,7 @@
 
 use Craft;
 use craft\base\Actionable;
+use craft\base\CrossSiteCopyableFieldInterface;
 use craft\base\ElementInterface;
 use craft\base\FieldInterface;
 use craft\base\PreviewableFieldInterface;
@@ -428,7 +429,15 @@ protected function translationDescription(?ElementInterface $element = null, boo
     /**
      * @inheritdoc
      */
-    protected function actionMenuItems(): array
+    public function isCrossSiteCopyable(ElementInterface $element): bool
+    {
+        return $this->_field instanceof CrossSiteCopyableFieldInterface && $this->_field->getIsTranslatable($element);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function actionMenuItems(?ElementInterface $element = null, bool $static = false): array
     {
         if ($this->_field instanceof Actionable) {
             $items = $this->_field->getActionMenuItems();

src/fieldlayoutelements/TitleField.php

@@ -90,4 +90,12 @@ public function defaultLabel(?ElementInterface $element = null, bool $static = f
     {
         return Craft::t('app', 'Title');
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function isCrossSiteCopyable(ElementInterface $element): bool
+    {
+        return true;
+    }
 }

src/fieldlayoutelements/assets/AltField.php

@@ -128,4 +128,12 @@ protected function translationDescription(?ElementInterface $element = null, boo
 
         return ElementHelper::translationDescription($element->getVolume()->altTranslationMethod);
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function isCrossSiteCopyable(ElementInterface $element): bool
+    {
+        return true;
+    }
 }