enhance: Proxy custom emojis to reduce image size and accelerate the frontend (#9431)

* fix(server): /emoji to accept `@.` host expression

* fix(client): use MkEmoji for custom emoji in MkEmojiPicker

* change convertToWebp

* nanka iroiro

* remove

* fix

* nearLosslessは労多くして益少なしなのでやめる

* do not cleanup tmp for development

* update sharp.js to 0.31.3

* mixed: true

* fix MkAutocomplete of 912791b3ab

* clean up

* https://github.com/misskey-dev/misskey/pull/9431#discussion_r1059215943

3 files changed, 16 insertions, 13 deletions

diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index ff52ad27d6..61cf811192 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -2,12 +2,10 @@ import { Inject, Injectable } from '@nestjs/common';
 import { DataSource, In, IsNull } from 'typeorm';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { DI } from '@/di-symbols.js';
-import type { Config } from '@/config.js';
 import { IdService } from '@/core/IdService.js';
 import type { DriveFile } from '@/models/entities/DriveFile.js';
 import type { Emoji } from '@/models/entities/Emoji.js';
 import { Cache } from '@/misc/cache.js';
-import { query } from '@/misc/prelude/url.js';
 import type { Note } from '@/models/entities/Note.js';
 import type { EmojisRepository } from '@/models/index.js';
 import { UtilityService } from '@/core/UtilityService.js';
@@ -27,9 +25,6 @@ export class CustomEmojiService {
 	private cache: Cache<Emoji | null>;
 
 	constructor(
-		@Inject(DI.config)
-		private config: Config,
-
 		@Inject(DI.db)
 		private db: DataSource,
 
@@ -117,7 +112,7 @@ export class CustomEmojiService {
 
 		const isLocal = emoji.host == null;
 		const emojiUrl = emoji.publicUrl || emoji.originalUrl; // || emoji.originalUrl してるのは後方互換性のため
-		const url = isLocal ? emojiUrl : `${this.config.url}/proxy/${encodeURIComponent((new URL(emojiUrl)).pathname)}?${query({ url: emojiUrl })}`;
+		const url = emojiUrl;
 
 		return {
 			name: emojiName,
diff --git a/packages/backend/src/core/DownloadService.ts b/packages/backend/src/core/DownloadService.ts
index 9097bb08e0..62123246a7 100644
--- a/packages/backend/src/core/DownloadService.ts
+++ b/packages/backend/src/core/DownloadService.ts
@@ -33,7 +33,7 @@ export class DownloadService {
 
 	@bindThis
 	public async downloadUrl(url: string, path: string): Promise<void> {
-		this.logger.info(`Downloading ${chalk.cyan(url)} ...`);
+		this.logger.info(`Downloading ${chalk.cyan(url)} to ${chalk.cyanBright(path)} ...`);
 	
 		const timeout = 30 * 1000;
 		const operationTimeout = 60 * 1000;
diff --git a/packages/backend/src/core/ImageProcessingService.ts b/packages/backend/src/core/ImageProcessingService.ts
index 3a61873044..312189eea4 100644
--- a/packages/backend/src/core/ImageProcessingService.ts
+++ b/packages/backend/src/core/ImageProcessingService.ts
@@ -8,6 +8,16 @@ export type IImage = {
 	ext: string | null;
 	type: string;
 };
+
+export const webpDefault: sharp.WebpOptions = {
+	quality: 85,
+	alphaQuality: 95,
+	lossless: false,
+	nearLossless: false,
+	smartSubsample: true,
+	mixed: true,
+};
+
 import { bindThis } from '@/decorators.js';
 
 @Injectable()
@@ -53,21 +63,19 @@ export class ImageProcessingService {
 	 *   with resize, remove metadata, resolve orientation, stop animation
 	 */
 	@bindThis
-	public async convertToWebp(path: string, width: number, height: number, quality = 85): Promise<IImage> {
-		return this.convertSharpToWebp(await sharp(path), width, height, quality);
+	public async convertToWebp(path: string, width: number, height: number, options: sharp.WebpOptions = webpDefault): Promise<IImage> {
+		return this.convertSharpToWebp(await sharp(path), width, height, options);
 	}
 
 	@bindThis
-	public async convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number, quality = 85): Promise<IImage> {
+	public async convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number, options: sharp.WebpOptions = webpDefault): Promise<IImage> {
 		const data = await sharp
 			.resize(width, height, {
 				fit: 'inside',
 				withoutEnlargement: true,
 			})
 			.rotate()
-			.webp({
-				quality,
-			})
+			.webp(options)
 			.toBuffer();
 
 		return {