Initial commit

application/Espo/Tools/Attachment/Checker.php

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+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * 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/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Attachment;
+
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Exceptions\ForbiddenSilent;
+use Espo\Core\Utils\File\MimeType;
+use Espo\Core\Utils\Metadata;
+use Espo\Entities\Attachment;
+use Espo\Core\ORM\Type\FieldType;
+
+class Checker
+{
+    public function __construct(
+        private Metadata $metadata,
+        private MimeType $mimeType,
+        private DetailsObtainer $detailsObtainer
+    ) {}
+
+    /**
+     * Check a mine-type for allowance.
+     *
+     * @throws Forbidden
+     */
+    public function checkType(Attachment $attachment): void
+    {
+        $field = $attachment->getTargetField();
+        $entityType = $attachment->getParentType() ?? $attachment->getRelatedType();
+
+        if (!$field || !$entityType) {
+            return;
+        }
+
+        if (
+            $this->detailsObtainer->getFieldType($attachment) === FieldType::IMAGE ||
+            $attachment->getRole() === Attachment::ROLE_INLINE_ATTACHMENT
+        ) {
+            $this->checkTypeImage($attachment);
+
+            return;
+        }
+
+        $extension = strtolower(DetailsObtainer::getFileExtension($attachment) ?? '');
+
+        $mimeType = $this->mimeType->getMimeTypeByExtension($extension) ??
+            $attachment->getType();
+
+        /** @var string[] $accept */
+        $accept = $this->metadata->get(['entityDefs', $entityType, 'fields', $field, 'accept']) ?? [];
+
+        if ($accept === []) {
+            return;
+        }
+
+        $found = false;
+
+        foreach ($accept as $token) {
+            if (strtolower($token) === '.' . $extension) {
+                $found = true;
+
+                break;
+            }
+
+            if ($mimeType && MimeType::matchMimeTypeToAcceptToken($mimeType, $token)) {
+                $found = true;
+
+                break;
+            }
+        }
+
+        if (!$found) {
+            throw new ForbiddenSilent("Not allowed file type.");
+        }
+    }
+
+    /**
+     * Check a mime-time for allowance for an image.
+     *
+     * @throws Forbidden
+     */
+    public function checkTypeImage(Attachment $attachment, ?string $filePath = null): void
+    {
+        $extension = DetailsObtainer::getFileExtension($attachment) ?? '';
+
+        $mimeType = $this->mimeType->getMimeTypeByExtension($extension);
+
+        /** @var string[] $imageTypeList */
+        $imageTypeList = $this->metadata->get(['app', 'image', 'allowedFileTypeList']) ?? [];
+
+        if (!in_array($mimeType, $imageTypeList)) {
+            throw new ForbiddenSilent("Not allowed file type.");
+        }
+
+        $setMimeType = $attachment->getType();
+
+        if (strtolower($setMimeType ?? '') !== $mimeType) {
+            throw new ForbiddenSilent("Passed type does not correspond to extension.");
+        }
+
+        $this->checkDetectedMimeType($attachment, $filePath);
+    }
+
+    /**
+     * @throws Forbidden
+     */
+    private function checkDetectedMimeType(Attachment $attachment, ?string $filePath = null): void
+    {
+        // ext-fileinfo required, otherwise bypass.
+        if (!class_exists('\finfo') || !defined('FILEINFO_MIME_TYPE')) {
+            return;
+        }
+
+        /** @var ?string $contents */
+        $contents = $attachment->get('contents');
+
+        if (!$contents && !$filePath) {
+            return;
+        }
+
+        $extension = DetailsObtainer::getFileExtension($attachment) ?? '';
+
+        $mimeTypeList = $this->mimeType->getMimeTypeListByExtension($extension);
+
+        $fileInfo = new \finfo(FILEINFO_MIME_TYPE);
+
+        $detectedMimeType = $filePath ?
+            $fileInfo->file($filePath) :
+            $fileInfo->buffer($contents);
+
+        if (!in_array($detectedMimeType, $mimeTypeList)) {
+            throw new ForbiddenSilent("Detected mime type does not correspond to extension.");
+        }
+    }
+}