IBX-9594: Describe creating a custom DAM connector

code_samples/back_office/images/config/packages/views.yaml

@@ -0,0 +1,10 @@
+parameters:
+    ibexa.site_access.config.<scope>.image_asset_view_defaults:
+        full:
+            commons:
+                template: '@@ibexadesign/commons_asset_view.html.twig'
+                match:
+                    SourceBasedViewMatcher: commons
+            default:
+                template: '@@ibexadesign/ui/field_type/image_asset_view.html.twig'
+                match: []

code_samples/back_office/images/config/services.yaml

@@ -6,3 +6,28 @@ services:
             - '@ibexa.api.service.content'
             - '@ibexa.field_type.ezbinaryfile.io_service'
             - '@Ibexa\Core\Helper\TranslationHelper'
+
+    App\Connector\Dam\Handler\WikimediaCommonsHandler:
+        tags:
+            - { name: 'ibexa.platform.connector.dam.handler', source: 'commons' }
+
+    App\Connector\Dam\Transformation\WikimediaCommonsTransformationFactory:
+        tags:
+            - { name: 'ibexa.platform.connector.dam.transformation_factory', source: 'commons' }
+
+    commons_asset_variation_generator:
+        class: Ibexa\Connector\Dam\Variation\URLBasedVariationGenerator
+        tags:
+            - { name: 'ibexa.platform.connector.dam.variation_generator', source: 'commons' }
+
+    commons_search_tab:
+        class: Ibexa\Connector\Dam\View\Search\Tab\GenericSearchTab
+        public: false
+        arguments:
+            $identifier: 'commons'
+            $source: 'commons'
+            $name: 'Wikimedia Commons'
+            $searchFormType: 'Ibexa\Connector\Dam\Form\Search\GenericSearchType'
+            $formFactory: '@form.factory'
+        tags:
+            - { name: 'ibexa.admin_ui.tab', group: 'connector-dam-search' }

code_samples/back_office/images/src/Connector/Dam/Handler/WikimediaCommonsHandler.php

@@ -0,0 +1,82 @@
+<?php declare(strict_types=1);
+
+namespace App\Connector\Dam\Handler;
+
+use Ibexa\Contracts\Connector\Dam\Asset;
+use Ibexa\Contracts\Connector\Dam\AssetCollection;
+use Ibexa\Contracts\Connector\Dam\AssetIdentifier;
+use Ibexa\Contracts\Connector\Dam\AssetMetadata;
+use Ibexa\Contracts\Connector\Dam\AssetSource;
+use Ibexa\Contracts\Connector\Dam\AssetUri;
+use Ibexa\Contracts\Connector\Dam\Handler\Handler as HandlerInterface;
+use Ibexa\Contracts\Connector\Dam\Search\AssetSearchResult;
+use Ibexa\Contracts\Connector\Dam\Search\Query;
+
+class WikimediaCommonsHandler implements HandlerInterface
+{
+    public function search(Query $query, int $offset = 0, int $limit = 20): AssetSearchResult
+    {
+        $searchUrl = 'https://commons.wikimedia.org/w/api.php?action=query&list=search&format=json&srnamespace=6'
+            . '&srsearch=' . urlencode($query->getPhrase())
+            . '&sroffset=' . $offset
+            . '&srlimit=' . $limit
+        ;
+
+        $jsonResponse = file_get_contents($searchUrl);
+        if ($jsonResponse === false) {
+            return new AssetSearchResult(0, new AssetCollection([]));
+        }
+
+        $response = json_decode($jsonResponse, true);
+        if (!isset($response['query']['search'])) {
+            return new AssetSearchResult(0, new AssetCollection([]));
+        }
+
+        $assets = [];
+        foreach ($response['query']['search'] as $result) {
+            $identifier = str_replace('File:', '', $result['title']);
+            $assets[] = $this->fetchAsset($identifier);
+        }
+
+        return new AssetSearchResult(
+            (int) ($response['query']['searchinfo']['totalhits'] ?? 0),
+            new AssetCollection($assets)
+        );
+    }
+
+    public function fetchAsset(string $id): Asset
+    {
+        $metadataUrl = 'https://commons.wikimedia.org/w/api.php?action=query&prop=imageinfo&iiprop=extmetadata&format=json'
+            . '&titles=File%3a' . urlencode($id)
+        ;
+
+        $jsonResponse = file_get_contents($metadataUrl);
+        if ($jsonResponse === false) {
+            throw new \RuntimeException('Couldn\'t retrieve asset metadata');
+        }
+
+        $response = json_decode($jsonResponse, true);
+        if (!isset($response['query']['pages'])) {
+            throw new \RuntimeException('Couldn\'t parse asset metadata');
+        }
+
+        $pageData = array_values($response['query']['pages'])[0] ?? null;
+        if (!isset($pageData['imageinfo'][0]['extmetadata'])) {
+            throw new \RuntimeException('Couldn\'t parse image asset metadata');
+        }
+
+        $imageInfo = $pageData['imageinfo'][0]['extmetadata'];
+
+        return new Asset(
+            new AssetIdentifier($id),
+            new AssetSource('commons'),
+            new AssetUri('https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/' . urlencode($id)),
+            new AssetMetadata([
+                'page_url' => "https://commons.wikimedia.org/wiki/File:$id",
+                'author' => $imageInfo['Artist']['value'] ?? null,
+                'license' => $imageInfo['LicenseShortName']['value'] ?? null,
+                'license_url' => $imageInfo['LicenseUrl']['value'] ?? null,
+            ])
+        );
+    }
+}

code_samples/back_office/images/src/Connector/Dam/Transformation/WikimediaCommonsTransformationFactory.php

@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace App\Connector\Dam\Transformation;
+
+use Ibexa\Contracts\Connector\Dam\Variation\Transformation;
+use Ibexa\Contracts\Connector\Dam\Variation\TransformationFactory as TransformationFactoryInterface;
+
+class WikimediaCommonsTransformationFactory implements TransformationFactoryInterface
+{
+    /** @param array<string, scalar> $transformationParameters */
+    public function build(?string $transformationName = null, array $transformationParameters = []): Transformation
+    {
+        if (null === $transformationName) {
+            return new Transformation(null, array_map('strval', $transformationParameters));
+        }
+
+        $transformations = $this->buildAll();
+
+        if (array_key_exists($transformationName, $transformations)) {
+            return $transformations[$transformationName];
+        }
+
+        throw new \InvalidArgumentException(sprintf('Unknown transformation "%s".', $transformationName));
+    }
+
+    public function buildAll(): array
+    {
+        return [
+            'reference' => new Transformation('reference', []),
+            'tiny' => new Transformation('tiny', ['width' => '30']),
+            'small' => new Transformation('small', ['width' => '100']),
+            'medium' => new Transformation('medium', ['width' => '200']),
+            'large' => new Transformation('large', ['width' => '300']),
+        ];
+    }
+}

code_samples/back_office/images/templates/themes/standard/commons_asset_view.html.twig

@@ -0,0 +1,12 @@
+{% extends '@ibexadesign/ui/field_type/image_asset_view.html.twig' %}
+
+{% block asset_preview %}
+    {{ parent() }}
+    <div>
+        <a href="{{ asset.assetMetadata.page_url }}">Image</a>
+        {% if asset.assetMetadata.author %} by {{ asset.assetMetadata.author }}{% endif %}
+        {% if asset.assetMetadata.license and asset.assetMetadata.license_url %}
+            under <a href="{{ asset.assetMetadata.license_url }}">{{ asset.assetMetadata.license }}</a>
+        {% endif %}.
+    </div>
+{% endblock %}

code_samples/back_office/images/translations/ibexa_fieldtypes_preview.en.yaml

@@ -0,0 +1,4 @@
+ezimageasset.dam_asset.page_url: Image page
+ezimageasset.dam_asset.author: Image author
+ezimageasset.dam_asset.license: License
+ezimageasset.dam_asset.license_url: License page

composer.json

@@ -66,7 +66,8 @@
         "ibexa/solr": "5.0.x-dev",
         "ibexa/version-comparison": "5.0.x-dev",
         "league/oauth2-google": "^4.0",
-        "ibexa/core-search": "~5.0.x-dev"
+        "ibexa/core-search": "~5.0.x-dev",
+        "ibexa/connector-dam": "~5.0.x-dev"
     },
     "scripts": {
         "fix-cs": "php-cs-fixer fix --config=.php-cs-fixer.php -v --show-progress=dots",

docs/administration/back_office/add_user_setting.md

@@ -27,7 +27,7 @@ You can order the settings in the **User** menu by setting their `priority`.
 `group` indicates the group that the setting is placed in.
 It can be one of the built-in groups, or a custom one.
 
-To create a custom setting group, create an `App\Setting\Group\MyGroup.php` file:
+To create a custom setting group, create an `App/Setting/Group/MyGroup.php` file:
 
 ``` php
 [[= include_file('code_samples/back_office/settings/src/Setting/Group/MyGroup.php') =]]

docs/administration/back_office/back_office_elements/formatting_date_and_time.md

@@ -17,7 +17,7 @@ You can format date and time by using the following services:
 - `@ibexa.user.settings.full_date_format.formatter`
 - `@ibexa.user.settings.full_time_format.formatter`
 
-To use them, create an `src\Service\MyService.php` file containing:
+To use them, create an `src/Service/MyService.php` file containing:
 
 ``` php
 <?php

docs/commerce/storefront/extend_storefront.md

@@ -7,7 +7,7 @@ edition: commerce
 
 ## Built-in menus
 
-With the `ibexa\storefront` package come the following built-in menus:
+With the `ibexa/storefront` package come the following built-in menus:
 
 | Item   | Value     | Description |
 |------------|----------|---------|

docs/content_management/images/add_image_asset_from_dam.md

@@ -20,9 +20,9 @@
 
 The configuration for each connector depends on the requirements of the specific DAM system.
 
-You can create your own connectors, or use the provided example DAM connector for [Unsplash](https://unsplash.com/).
+You can use the provided example DAM connector for [Unsplash](https://unsplash.com/), or [extend DAM support by creating a connector of your choice](#extend-dam-support-by-adding-custom-connector).
 
-To add the Unsplash connector to your system add the `ibexa/connector-unsplash` bundle to your installation.
+To add the Unsplash connector to your system, add the `ibexa/connector-unsplash` bundle to your installation.
 
 ## Add Image Asset in Page Builder [[% include 'snippets/experience_badge.md' %]] [[% include 'snippets/commerce_badge.md' %]]
 
@@ -83,3 +83,123 @@
 Now, when you use the Embed block in the Page Builder, you should see a DAM Image.
 
 For more information about block customization (defined templates, variations), see [Create custom block](4_create_a_custom_block.md).
+
+## Extend DAM support by adding custom connector
+
+To extend the DAM support built into [[= product_name =]], you must create a custom handler and transformation factory.
+
+!!! note "Wikimedia Commons licensing"
+
+    Before you use Wikimedia Commons assets in a production environment, ensure that you comply with their [license requirements](https://commons.wikimedia.org/wiki/Commons:Reusing_content_outside_Wikimedia#How_to_comply_with_a_file's_license_requirements).
+
+###  Create DAM handler
+
+This class handles searching through Wikimedia Commons for images and fetching image assets.
+
+In `src/Connector/Dam/Handler` folder, create the `WikimediaCommonsHandler.php` file that resembles the following example,
+which implements [`search()`](/api/php_api/php_api_reference/classes/Ibexa-Contracts-Connector-Dam-Handler-Handler.html#method_search) to query the server
+and [`fetchAsset()`](/api/php_api/php_api_reference/classes/Ibexa-Contracts-Connector-Dam-Handler-Handler.html#method_fetchAsset) to return asset objects:
+
+```php
+[[= include_file('code_samples/back_office/images/src/Connector/Dam/Handler/WikimediaCommonsHandler.php') =]]
+```
+
+Then, in `config/services.yaml`, register the handler as a service:
+
+```yaml
+[[= include_file('code_samples/back_office/images/config/services.yaml', 9, 12) =]]
+```
+
+The `source` parameter passed in the tag is an identifier of this new DAM connector and is used in other places to glue elements together.
+
+### Create transformation factory
+
+The transformation factory maps [[= product_name =]]'s image variations to corresponding variations from Wikimedia Commons.
+
+In `src/Connector/Dam/Transformation` folder, create the `WikimediaCommonsTransformationFactory.php` file that resembles the following example,
+which implements the [`TransformationFactory` interface](/api/php_api/php_api_reference/classes/Ibexa-Contracts-Connector-Dam-Variation-TransformationFactory.html):
+
+```php
+[[= include_file('code_samples/back_office/images/src/Connector/Dam/Transformation/WikimediaCommonsTransformationFactory.php') =]]
+```
+
+Then register the transformation factory as a service:
+
+```yaml
+[[= include_file('code_samples/back_office/images/config/services.yaml', 13, 16) =]]
+```
+
+### Register variations generator
+
+The variation generator applies map parameters coming from the transformation factory to build a fetch request to the DAM.
+The solution uses the built-in `URLBasedVariationGenerator` class, which adds all the map elements as query parameters to the request.
+
+For example, for an asset with the ID `Ibexa_Logo.svg`, the handler generates the Asset with [`AssetUri's URL`](/api/php_api/php_api_reference/classes/Ibexa-Contracts-Connector-Dam-AssetUri.html#method_getPath) equal to:
+
+`https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Ibexa_Logo.svg`
+
+When the user requests a specific variation of the image, for example, "large", the variation generator modifies the URL and returns it in the following form:
+
+`https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Ibexa_Logo.svg&width=300`
+
+For this to happen, register the variations generator as a service available for the custom `commons` connector:
+
+```yaml
+[[= include_file('code_samples/back_office/images/config/services.yaml', 17, 21) =]]
+```
+
+### Configure tab for "Select from DAM" modal
+
+To enable selecting an image from the DAM system, a modal window pops up with tabs and panels that contain different search interfaces.
+
+In this example, the search only uses the main text input.
+The tab and its corresponding panel are a service created by combining existing components, like in the case of other [back office tabs](back_office_tabs.md).
+
+The `commons_search_tab` service uses the `GenericSearchTab` class as a base, and the `GenericSearchType` form for search input.
+It is linked to the `commons` DAM source and uses the identifier `commons`. 
+The DAM search tab is registered in the `connector-dam-search` [tab group](back_office_tabs.md#tab-groups) using the `ibexa.admin_ui.tab` tag.
+
+
+```yaml
+[[= include_file('code_samples/back_office/images/config/services.yaml', 22, 33) =]]
+```
+
+### Create Twig template
+
+The template defines how images that come from Wikimedia Commons are displayed.
+
+In `templates/themes/standard/`, add the `commons_asset_view.html.twig` file that resembles the following example:
+
+```html+twig
+[[= include_file('code_samples/back_office/images/templates/themes/standard/commons_asset_view.html.twig') =]]
+```
+
+Then, register the template and a fallback template in configuration files.
+Replace `<scope>` with an [appropriate value](siteaccess_aware_configuration.md) that designates the SiteAccess or SiteAccess group, for example, `default` to use the template everywhere, including the back office:
+
+```yaml
+[[= include_file('code_samples/back_office/images/config/packages/views.yaml') =]]
+```
+
+### Provide back office translation
+
+When the image asset field is displayed in the back office, a table of metadata follows.
+This example uses new fields, so you need to provide translations for their labels, for example, in `translations/ibexa_fieldtypes_preview.en.yaml`:
+
+```yaml
+[[= include_file('code_samples/back_office/images/translations/ibexa_fieldtypes_preview.en.yaml') =]]
+```
+
+### Add Wikimedia Commons connection to DAM configuration
+
+You can now configure a connection with Wikimedia Commons under the `ibexa.system.<scope>.content.dam` key using the source identifier `commons`:
+
+```yaml
+ibexa:
+    system:
+        default:
+            content:
+                dam: [ commons ]
+```
+
+Once you clear the cache, you can search for images to see whether images from the newly configured DAM are displayed correctly, including their variations.

docs/content_management/images/images.md

@@ -215,7 +215,7 @@ It points to a custom controller that handles the downloading of the SVG file.
 The controller's definition (that you place in the `config/services.yaml` file under `services` key) and implementation are as follows:
 
 ```yaml
-[[= include_file('code_samples/back_office/images/config/services.yaml') =]]
+[[= include_file('code_samples/back_office/images/config/services.yaml', 0, 8) =]]
 ```
 
 ```php

docs/update_and_migration/from_3.3/update_from_3.3.md

@@ -148,7 +148,7 @@ CREATE INDEX idx_workflow_name ON ezeditorialworkflow_workflows(workflow_name);
 #### Enable Commerce features
 
 Commerce features in Experience and Content editions are disabled by default.
-If you use these features, after the update enable Commerce features by going to `config\packages\ecommerce.yaml`
+If you use these features, after the update enable Commerce features by going to `config/packages/ecommerce.yaml`
 and setting the following:
 
 ``` yaml