enhance(backend): ファイル種別が判定できない場合、拡張子を参照するように

packages/backend/src/core/DriveService.ts

@@ -469,6 +469,7 @@ export class DriveService {
 		if (user && this.meta.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;
 
 		const info = await this.fileInfoService.getFileInfo(path, {
+			fileName: name,
 			skipSensitiveDetection: skipNsfwCheck,
 			sensitiveThreshold: // 感度が高いほどしきい値は低くすることになる
 				this.meta.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :

packages/backend/src/core/FileInfoService.ts

@@ -64,6 +64,7 @@ export class FileInfoService {
 	 */
 	@bindThis
 	public async getFileInfo(path: string, opts: {
+		fileName?: string | null;
 		skipSensitiveDetection: boolean;
 		sensitiveThreshold?: number;
 		sensitiveThresholdForPorn?: number;
@@ -76,6 +77,26 @@ export class FileInfoService {
 
 		let type = await this.detectType(path);
 
+		if (type.mime === TYPE_OCTET_STREAM.mime && opts.fileName != null) {
+			const ext = opts.fileName.split('.').pop();
+			if (ext === 'txt') {
+				type = {
+					mime: 'text/plain',
+					ext: 'txt',
+				};
+			} else if (ext === 'csv') {
+				type = {
+					mime: 'text/csv',
+					ext: 'csv',
+				};
+			} else if (ext === 'json') {
+				type = {
+					mime: 'application/json',
+					ext: 'json',
+				};
+			}
+		}
+
 		// image dimensions
 		let width: number | undefined;
 		let height: number | undefined;