refactor: add option to check preview availability for a specific format

Signed-off-by: Anderson Entwistle <46688047+aentwist@users.noreply.github.com>

lib/private/PreviewManager.php

@@ -243,13 +243,15 @@ public function isMimeSupported($mimeType = '*') {
 	/**
 	 * Check if a preview can be generated for a file
 	 */
-	public function isAvailable(\OCP\Files\FileInfo $file): bool {
+	public function isAvailable(\OCP\Files\FileInfo $file, ?string $previewMimeType = null): bool {
+		if (!$previewMimeType) $previewMimeType = $file->getMimeType();
+
 		if (!$this->config->getSystemValue('enable_previews', true)) {
 			return false;
 		}
 
 		$this->registerCoreProviders();
-		if (!$this->isMimeSupported($file->getMimetype())) {
+		if (!$this->isMimeSupported($previewMimeType)) {
 			return false;
 		}
 
@@ -259,7 +261,7 @@ public function isAvailable(\OCP\Files\FileInfo $file): bool {
 		}
 
 		foreach ($this->providers as $supportedMimeType => $providers) {
-			if (preg_match($supportedMimeType, $file->getMimetype())) {
+			if (preg_match($supportedMimeType, $previewMimeType)) {
 				foreach ($providers as $providerClosure) {
 					$provider = $this->helper->getProvider($providerClosure);
 					if (!($provider instanceof IProviderV2)) {

lib/public/IPreview.php

@@ -108,10 +108,11 @@ public function isMimeSupported($mimeType = '*');
 	 * Check if a preview can be generated for a file
 	 *
 	 * @param \OCP\Files\FileInfo $file
+	 * @param ?string $previewMimeType MIME type of the preview to be generated
 	 * @return bool
 	 * @since 8.0.0
 	 */
-	public function isAvailable(\OCP\Files\FileInfo $file);
+	public function isAvailable(\OCP\Files\FileInfo $file, string $previewMimeType);
 
 	/**
 	 * Generates previews of a file