リモートのカスタム絵文字リアクションを表示できるように (#6239)

* リモートのカスタム絵文字リアクションを表示できるように

* AP

* DBマイグレーション

* ローカルのリアクションの.

* fix

* fix

* fix

* space

src/misc/reaction-lib.ts

@@ -1,6 +1,7 @@
 import { emojiRegex } from './emoji-regex';
 import { fetchMeta } from './fetch-meta';
 import { Emojis } from '../models';
+import { toPunyNullable } from './convert-host';
 
 const legacies: Record<string, string> = {
 	'like':     '👍',
@@ -40,12 +41,20 @@ export function convertLegacyReactions(reactions: Record<string, number>) {
 		}
 	}
 
-	return _reactions;
+	const _reactions2 = {} as Record<string, number>;
+
+	for (const reaction of Object.keys(_reactions)) {
+		_reactions2[decodeReaction(reaction).reaction] = _reactions[reaction];
+	}
+
+	return _reactions2;
 }
 
-export async function toDbReaction(reaction?: string | null): Promise<string> {
+export async function toDbReaction(reaction?: string | null, reacterHost?: string | null): Promise<string> {
 	if (reaction == null) return await getFallbackReaction();
 
+	reacterHost = toPunyNullable(reacterHost);
+
 	// 文字列タイプのリアクションを絵文字に変換
 	if (Object.keys(legacies).includes(reaction)) return legacies[reaction];
 
@@ -61,18 +70,58 @@ export async function toDbReaction(reaction?: string | null): Promise<string> {
 
 	const custom = reaction.match(/^:([\w+-]+):$/);
 	if (custom) {
+		const name = custom[1];
 		const emoji = await Emojis.findOne({
-			host: null,
-			name: custom[1],
+			host: reacterHost || null,
+			name,
 		});
 
-		if (emoji) return reaction;
+		if (emoji) return reacterHost ? `:${name}@${reacterHost}:` : `:${name}:`
 	}
 
 	return await getFallbackReaction();
 }
 
+type DecodedReaction = {
+	/**
+	 * リアクション名 (Unicode Emoji or ':name@hostname' or ':name@.')
+	 */
+	reaction: string;
+
+	/**
+	 * name (カスタム絵文字の場合name, Emojiクエリに使う)
+	 */
+	name?: string;
+
+	/**
+	 * host (カスタム絵文字の場合host, Emojiクエリに使う)
+	 */
+	host?: string | null;
+};
+
+export function decodeReaction(str: string): DecodedReaction {
+	const custom = str.match(/^:([\w+-]+)(?:@([\w.-]+))?:$/);
+
+	if (custom) {
+		const name = custom[1];
+		const host = custom[2] || null;
+
+		return {
+			reaction: `:${name}@${host || '.'}:`,	// ローカル分は@以降を省略するのではなく.にする
+			name,
+			host
+		};
+	}
+
+	return {
+		reaction: str,
+		name: undefined,
+		host: undefined
+	};
+}
+
 export function convertLegacyReaction(reaction: string): string {
+	reaction = decodeReaction(reaction).reaction;
 	if (Object.keys(legacies).includes(reaction)) return legacies[reaction];
 	return reaction;
 }