upd: rip out AiService

3 files changed, 4 insertions, 246 deletions

diff --git a/packages/backend/src/core/AiService.ts b/packages/backend/src/core/AiService.ts
deleted file mode 100644
index 4e876495a6..0000000000
--- a/packages/backend/src/core/AiService.ts
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and other misskey contributors
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import * as fs from 'node:fs';
-import { fileURLToPath } from 'node:url';
-import { dirname } from 'node:path';
-import { Injectable } from '@nestjs/common';
-import * as nsfw from 'nsfwjs';
-import si from 'systeminformation';
-import { Mutex } from 'async-mutex';
-import { bindThis } from '@/decorators.js';
-
-const _filename = fileURLToPath(import.meta.url);
-const _dirname = dirname(_filename);
-
-const REQUIRED_CPU_FLAGS = ['avx2', 'fma'];
-let isSupportedCpu: undefined | boolean = undefined;
-
-@Injectable()
-export class AiService {
-	private model: nsfw.NSFWJS;
-	private modelLoadMutex: Mutex = new Mutex();
-
-	constructor(
-	) {
-	}
-
-	@bindThis
-	public async detectSensitive(path: string): Promise<nsfw.predictionType[] | null> {
-		try {
-			if (isSupportedCpu === undefined) {
-				const cpuFlags = await this.getCpuFlags();
-				isSupportedCpu = REQUIRED_CPU_FLAGS.every(required => cpuFlags.includes(required));
-			}
-
-			if (!isSupportedCpu) {
-				console.error('This CPU cannot use TensorFlow.');
-				return null;
-			}
-
-			const tf = await import('@tensorflow/tfjs-node');
-
-			if (this.model == null) {
-				await this.modelLoadMutex.runExclusive(async () => {
-					if (this.model == null) {
-						this.model = await nsfw.load(`file://${_dirname}/../../nsfw-model/`, { size: 299 });
-					}
-				});
-			}
-
-			const buffer = await fs.promises.readFile(path);
-			const image = await tf.node.decodeImage(buffer, 3) as any;
-			try {
-				const predictions = await this.model.classify(image);
-				return predictions;
-			} finally {
-				image.dispose();
-			}
-		} catch (err) {
-			console.error(err);
-			return null;
-		}
-	}
-
-	@bindThis
-	private async getCpuFlags(): Promise<string[]> {
-		const str = await si.cpuFlags();
-		return str.split(/\s+/);
-	}
-}
diff --git a/packages/backend/src/core/CoreModule.ts b/packages/backend/src/core/CoreModule.ts
index 47091af216..cb32a31952 100644
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@@ -6,7 +6,6 @@
 import { Module } from '@nestjs/common';
 import { AccountMoveService } from './AccountMoveService.js';
 import { AccountUpdateService } from './AccountUpdateService.js';
-import { AiService } from './AiService.js';
 import { AnnouncementService } from './AnnouncementService.js';
 import { AntennaService } from './AntennaService.js';
 import { AppLockService } from './AppLockService.js';
@@ -138,7 +137,6 @@ import type { Provider } from '@nestjs/common';
 const $LoggerService: Provider = { provide: 'LoggerService', useExisting: LoggerService };
 const $AccountMoveService: Provider = { provide: 'AccountMoveService', useExisting: AccountMoveService };
 const $AccountUpdateService: Provider = { provide: 'AccountUpdateService', useExisting: AccountUpdateService };
-const $AiService: Provider = { provide: 'AiService', useExisting: AiService };
 const $AnnouncementService: Provider = { provide: 'AnnouncementService', useExisting: AnnouncementService };
 const $AntennaService: Provider = { provide: 'AntennaService', useExisting: AntennaService };
 const $AppLockService: Provider = { provide: 'AppLockService', useExisting: AppLockService };
@@ -274,7 +272,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		LoggerService,
 		AccountMoveService,
 		AccountUpdateService,
-		AiService,
 		AnnouncementService,
 		AntennaService,
 		AppLockService,
@@ -403,7 +400,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$LoggerService,
 		$AccountMoveService,
 		$AccountUpdateService,
-		$AiService,
 		$AnnouncementService,
 		$AntennaService,
 		$AppLockService,
@@ -533,7 +529,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		LoggerService,
 		AccountMoveService,
 		AccountUpdateService,
-		AiService,
 		AnnouncementService,
 		AntennaService,
 		AppLockService,
@@ -661,7 +656,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$LoggerService,
 		$AccountMoveService,
 		$AccountUpdateService,
-		$AiService,
 		$AnnouncementService,
 		$AntennaService,
 		$AppLockService,
diff --git a/packages/backend/src/core/FileInfoService.ts b/packages/backend/src/core/FileInfoService.ts
index fdea59a8ad..25487fa0fa 100644
--- a/packages/backend/src/core/FileInfoService.ts
+++ b/packages/backend/src/core/FileInfoService.ts
@@ -5,19 +5,13 @@
 
 import * as fs from 'node:fs';
 import * as crypto from 'node:crypto';
-import { join } from 'node:path';
 import * as stream from 'node:stream/promises';
 import { Injectable } from '@nestjs/common';
-import { FSWatcher } from 'chokidar';
 import * as fileType from 'file-type';
-import FFmpeg from 'fluent-ffmpeg';
 import isSvg from 'is-svg';
 import probeImageSize from 'probe-image-size';
-import { type predictionType } from 'nsfwjs';
 import sharp from 'sharp';
 import { encode } from 'blurhash';
-import { createTempDir } from '@/misc/create-temp.js';
-import { AiService } from '@/core/AiService.js';
 import { bindThis } from '@/decorators.js';
 
 export type FileInfo = {
@@ -49,7 +43,6 @@ const TYPE_SVG = {
 @Injectable()
 export class FileInfoService {
 	constructor(
-		private aiService: AiService,
 	) {
 	}
 
@@ -57,7 +50,8 @@ export class FileInfoService {
 	 * Get file information
 	 */
 	@bindThis
-	public async getFileInfo(path: string, opts: {
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
+	public async getFileInfo(path: string, _opts: {
 		skipSensitiveDetection: boolean;
 		sensitiveThreshold?: number;
 		sensitiveThresholdForPorn?: number;
@@ -128,22 +122,8 @@ export class FileInfoService {
 			});
 		}
 
-		let sensitive = false;
-		let porn = false;
-
-		if (!opts.skipSensitiveDetection) {
-			await this.detectSensitivity(
-				path,
-				type.mime,
-				opts.sensitiveThreshold ?? 0.5,
-				opts.sensitiveThresholdForPorn ?? 0.75,
-				opts.enableSensitiveMediaDetectionForVideos ?? false,
-			).then(value => {
-				[sensitive, porn] = value;
-			}, error => {
-				warnings.push(`detectSensitivity failed: ${error}`);
-			});
-		}
+		const sensitive = false;
+		const porn = false;
 
 		return {
 			size,
@@ -160,150 +140,6 @@ export class FileInfoService {
 	}
 
 	@bindThis
-	private async detectSensitivity(source: string, mime: string, sensitiveThreshold: number, sensitiveThresholdForPorn: number, analyzeVideo: boolean): Promise<[sensitive: boolean, porn: boolean]> {
-		let sensitive = false;
-		let porn = false;
-
-		function judgePrediction(result: readonly predictionType[]): [sensitive: boolean, porn: boolean] {
-			let sensitive = false;
-			let porn = false;
-
-			if ((result.find(x => x.className === 'Sexy')?.probability ?? 0) > sensitiveThreshold) sensitive = true;
-			if ((result.find(x => x.className === 'Hentai')?.probability ?? 0) > sensitiveThreshold) sensitive = true;
-			if ((result.find(x => x.className === 'Porn')?.probability ?? 0) > sensitiveThreshold) sensitive = true;
-
-			if ((result.find(x => x.className === 'Porn')?.probability ?? 0) > sensitiveThresholdForPorn) porn = true;
-
-			return [sensitive, porn];
-		}
-
-		if ([
-			'image/jpeg',
-			'image/png',
-			'image/webp',
-		].includes(mime)) {
-			const result = await this.aiService.detectSensitive(source);
-			if (result) {
-				[sensitive, porn] = judgePrediction(result);
-			}
-		} else if (analyzeVideo && (mime === 'image/apng' || mime.startsWith('video/'))) {
-			const [outDir, disposeOutDir] = await createTempDir();
-			try {
-				const command = FFmpeg()
-					.input(source)
-					.inputOptions([
-						'-skip_frame', 'nokey', // 可能ならキーフレームのみを取得してほしいとする（そうなるとは限らない）
-						'-lowres', '3', // 元の画質でデコードする必要はないので 1/8 画質でデコードしてもよいとする（そうなるとは限らない）
-					])
-					.noAudio()
-					.videoFilters([
-						{
-							filter: 'select', // フレームのフィルタリング
-							options: {
-								e: 'eq(pict_type,PICT_TYPE_I)', // I-Frame のみをフィルタする（VP9 とかはデコードしてみないとわからないっぽい）
-							},
-						},
-						{
-							filter: 'blackframe', // 暗いフレームの検出
-							options: {
-								amount: '0', // 暗さに関わらず全てのフレームで測定値を取る
-							},
-						},
-						{
-							filter: 'metadata',
-							options: {
-								mode: 'select', // フレーム選択モード
-								key: 'lavfi.blackframe.pblack', // フレームにおける暗部の百分率（前のフィルタからのメタデータを参照する）
-								value: '50',
-								function: 'less', // 50% 未満のフレームを選択する（50% 以上暗部があるフレームだと誤検知を招くかもしれないので）
-							},
-						},
-						{
-							filter: 'scale',
-							options: {
-								w: 299,
-								h: 299,
-							},
-						},
-					])
-					.format('image2')
-					.output(join(outDir, '%d.png'))
-					.outputOptions(['-vsync', '0']); // 可変フレームレートにすることで穴埋めをさせない
-				const results: ReturnType<typeof judgePrediction>[] = [];
-				let frameIndex = 0;
-				let targetIndex = 0;
-				let nextIndex = 1;
-				for await (const path of this.asyncIterateFrames(outDir, command)) {
-					try {
-						const index = frameIndex++;
-						if (index !== targetIndex) {
-							continue;
-						}
-						targetIndex = nextIndex;
-						nextIndex += index; // fibonacci sequence によってフレーム数制限を掛ける
-						const result = await this.aiService.detectSensitive(path);
-						if (result) {
-							results.push(judgePrediction(result));
-						}
-					} finally {
-						fs.promises.unlink(path);
-					}
-				}
-				sensitive = results.filter(x => x[0]).length >= Math.ceil(results.length * sensitiveThreshold);
-				porn = results.filter(x => x[1]).length >= Math.ceil(results.length * sensitiveThresholdForPorn);
-			} finally {
-				disposeOutDir();
-			}
-		}
-
-		return [sensitive, porn];
-	}
-
-	private async *asyncIterateFrames(cwd: string, command: FFmpeg.FfmpegCommand): AsyncGenerator<string, void> {
-		const watcher = new FSWatcher({
-			cwd,
-			disableGlobbing: true,
-		});
-		let finished = false;
-		command.once('end', () => {
-			finished = true;
-			watcher.close();
-		});
-		command.run();
-		for (let i = 1; true; i++) { // eslint-disable-line @typescript-eslint/no-unnecessary-condition
-			const current = `${i}.png`;
-			const next = `${i + 1}.png`;
-			const framePath = join(cwd, current);
-			if (await this.exists(join(cwd, next))) {
-				yield framePath;
-			} else if (!finished) { // eslint-disable-line @typescript-eslint/no-unnecessary-condition
-				watcher.add(next);
-				await new Promise<void>((resolve, reject) => {
-					watcher.on('add', function onAdd(path) {
-						if (path === next) { // 次フレームの書き出しが始まっているなら、現在フレームの書き出しは終わっている
-							watcher.unwatch(current);
-							watcher.off('add', onAdd);
-							resolve();
-						}
-					});
-					command.once('end', resolve); // 全てのフレームを処理し終わったなら、最終フレームである現在フレームの書き出しは終わっている
-					command.once('error', reject);
-				});
-				yield framePath;
-			} else if (await this.exists(framePath)) {
-				yield framePath;
-			} else {
-				return;
-			}
-		}
-	}
-
-	@bindThis
-	private exists(path: string): Promise<boolean> {
-		return fs.promises.access(path).then(() => true, () => false);
-	}
-
-	@bindThis
 	public fixMime(mime: string | fileType.MimeType): string {
 		// see https://github.com/misskey-dev/misskey/pull/10686
 		if (mime === 'audio/x-flac') {