Added API endpoint for generating labels (#1234)

* init API endpoint for generating labels

* Improved API docs for label endpoint

* Improved LabelGenerationProcessor

---------

Co-authored-by: Jan Böhmer <mail@jan-boehmer.de>

src/ApiResource/LabelGenerationRequest.php

@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2026 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiProperty;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\OpenApi\Model\Operation;
+use ApiPlatform\OpenApi\Model\RequestBody;
+use ApiPlatform\OpenApi\Model\Response;
+use App\Entity\LabelSystem\LabelSupportedElement;
+use App\State\LabelGenerationProcessor;
+use App\Validator\Constraints\Misc\ValidRange;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * API Resource for generating PDF labels for parts, part lots, or storage locations.
+ * This endpoint allows generating labels using saved label profiles.
+ */
+#[ApiResource(
+    uriTemplate: '/labels/generate',
+    description: 'Generate PDF labels for parts, part lots, or storage locations using label profiles.',
+    operations: [
+        new Post(
+            inputFormats: ['json' => ['application/json']],
+            outputFormats: [],
+            openapi: new Operation(
+                responses: [
+                    "200" => new Response(description: "PDF file containing the generated labels"),
+                ],
+                summary: 'Generate PDF labels',
+                description: 'Generate PDF labels for one or more elements using a label profile. Returns a PDF file.',
+                requestBody: new RequestBody(
+                    description: 'Label generation request',
+                    required: true,
+                ),
+            ),
+        )
+    ],
+    processor: LabelGenerationProcessor::class,
+)]
+class LabelGenerationRequest
+{
+    /**
+     * @var int The ID of the label profile to use for generation
+     */
+    #[Assert\NotBlank(message: 'Profile ID is required')]
+    #[Assert\Positive(message: 'Profile ID must be a positive integer')]
+    public int $profileId = 0;
+
+    /**
+     * @var string Comma-separated list of element IDs or ranges (e.g., "1,2,5-10,15")
+     */
+    #[Assert\NotBlank(message: 'Element IDs are required')]
+    #[ValidRange()]
+    #[ApiProperty(example: "1,2,5-10,15")]
+    public string $elementIds = '';
+
+    /**
+     * @var LabelSupportedElement|null Optional: Override the element type. If not provided, uses profile's default.
+     */
+    public ?LabelSupportedElement $elementType = null;
+}

src/Entity/LabelSystem/LabelProfile.php

@@ -41,6 +41,12 @@ declare(strict_types=1);
 
 namespace App\Entity\LabelSystem;
 
+use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
+use ApiPlatform\Metadata\ApiFilter;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\OpenApi\Model\Operation;
 use Doctrine\Common\Collections\Criteria;
 use App\Entity\Attachments\Attachment;
 use App\Repository\LabelProfileRepository;
@@ -58,6 +64,22 @@ use Symfony\Component\Validator\Constraints as Assert;
 /**
  * @extends AttachmentContainingDBElement<LabelAttachment>
  */
+#[ApiResource(
+    operations: [
+        new Get(
+            normalizationContext: ['groups' => ['label_profile:read', 'simple']],
+            security: "is_granted('read', object)",
+            openapi: new Operation(summary: 'Get a label profile by ID')
+        ),
+        new GetCollection(
+            normalizationContext: ['groups' => ['label_profile:read', 'simple']],
+            security: "is_granted('@labels.create_labels')",
+            openapi: new Operation(summary: 'List all available label profiles')
+        ),
+    ],
+    paginationEnabled: false,
+)]
+#[ApiFilter(SearchFilter::class, properties: ['options.supported_element' => 'exact', 'show_in_dropdown' => 'exact'])]
 #[UniqueEntity(['name', 'options.supported_element'])]
 #[ORM\Entity(repositoryClass: LabelProfileRepository::class)]
 #[ORM\EntityListeners([TreeCacheInvalidationListener::class])]
@@ -80,20 +102,21 @@ class LabelProfile extends AttachmentContainingDBElement
      */
     #[Assert\Valid]
     #[ORM\Embedded(class: 'LabelOptions')]
-    #[Groups(["extended", "full", "import"])]
+    #[Groups(["extended", "full", "import", "label_profile:read"])]
     protected LabelOptions $options;
 
     /**
      * @var string The comment info for this element
      */
     #[ORM\Column(type: Types::TEXT)]
+    #[Groups(["extended", "full", "import", "label_profile:read"])]
     protected string $comment = '';
 
     /**
      * @var bool determines, if this label profile should be shown in the dropdown quick menu
      */
     #[ORM\Column(type: Types::BOOLEAN)]
-    #[Groups(["extended", "full", "import"])]
+    #[Groups(["extended", "full", "import", "label_profile:read"])]
     protected bool $show_in_dropdown = true;
 
     public function __construct()

src/State/LabelGenerationProcessor.php

@@ -0,0 +1,141 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2026 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use App\ApiResource\LabelGenerationRequest;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\LabelSystem\LabelProfile;
+use App\Repository\DBElementRepository;
+use App\Repository\LabelProfileRepository;
+use App\Services\ElementTypeNameGenerator;
+use App\Services\LabelSystem\LabelGenerator;
+use App\Services\Misc\RangeParser;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class LabelGenerationProcessor implements ProcessorInterface
+{
+    public function __construct(
+        private readonly EntityManagerInterface $entityManager,
+        private readonly LabelGenerator $labelGenerator,
+        private readonly RangeParser $rangeParser,
+        private readonly ElementTypeNameGenerator $elementTypeNameGenerator,
+        private readonly Security $security,
+    ) {
+    }
+
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): Response
+    {
+        // Check if user has permission to create labels
+        if (!$this->security->isGranted('@labels.create_labels')) {
+            throw new AccessDeniedHttpException('You do not have permission to generate labels.');
+        }
+
+        if (!$data instanceof LabelGenerationRequest) {
+            throw new BadRequestHttpException('Invalid request data for label generation.');
+        }
+
+        /** @var LabelGenerationRequest $request */
+        $request = $data;
+
+        // Fetch the label profile
+        /** @var LabelProfileRepository<LabelProfile> $profileRepo */
+        $profileRepo = $this->entityManager->getRepository(LabelProfile::class);
+        $profile = $profileRepo->find($request->profileId);
+        if (!$profile instanceof LabelProfile) {
+            throw new NotFoundHttpException(sprintf('Label profile with ID %d not found.', $request->profileId));
+        }
+
+        // Check if user has read permission for the profile
+        if (!$this->security->isGranted('read', $profile)) {
+            throw new AccessDeniedHttpException('You do not have permission to access this label profile.');
+        }
+
+        // Get label options from profile
+        $options = $profile->getOptions();
+
+        // Override element type if provided, otherwise use profile's default
+        if ($request->elementType !== null) {
+            $options->setSupportedElement($request->elementType);
+        }
+
+        // Parse element IDs from the range string
+        try {
+            $idArray = $this->rangeParser->parse($request->elementIds);
+        } catch (\InvalidArgumentException $e) {
+            throw new BadRequestHttpException('Invalid element IDs format: ' . $e->getMessage());
+        }
+
+        if (empty($idArray)) {
+            throw new BadRequestHttpException('No valid element IDs provided.');
+        }
+
+        // Fetch the target entities
+        /** @var DBElementRepository<AbstractDBElement> $repo */
+        $repo = $this->entityManager->getRepository($options->getSupportedElement()->getEntityClass());
+
+        $elements = $repo->getElementsFromIDArray($idArray);
+
+        if (empty($elements)) {
+            throw new NotFoundHttpException('No elements found with the provided IDs.');
+        }
+
+        // Generate the PDF
+        try {
+            $pdfContent = $this->labelGenerator->generateLabel($options, $elements);
+        } catch (\Exception $e) {
+            throw new BadRequestHttpException('Failed to generate label: ' . $e->getMessage());
+        }
+
+        // Generate filename
+        $filename = $this->generateFilename($elements[0], $profile);
+
+
+        // Return PDF as response
+        return new Response(
+            $pdfContent,
+            Response::HTTP_OK,
+            [
+                'Content-Type' => 'application/pdf',
+                'Content-Disposition' => sprintf('attachment; filename="%s"', $filename),
+                'Content-Length' => (string) strlen($pdfContent),
+            ]
+        );
+    }
+
+    private function generateFilename(AbstractDBElement $element, LabelProfile $profile): string
+    {
+        $ret = 'label_' . $this->elementTypeNameGenerator->typeLabel($element);
+        $ret .= $element->getID();
+        $ret .= '_' . preg_replace('/[^a-z0-9_\-]/i', '_', $profile->getName());
+
+        return $ret . '.pdf';
+    }
+}