FEAT: Allow users to view pending follow requests they sent

This commit implements the `following/requests/sent` interface firstly
implemented on Firefish, and provides a UI interface to view the pending
follow requests users sent.

packages/backend/src/server/api/endpoints/following/requests/sent.ts

@@ -0,0 +1,77 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { QueryService } from '@/core/QueryService.js';
+import type { FollowRequestsRepository } from '@/models/_.js';
+import { FollowRequestEntityService } from '@/core/entities/FollowRequestEntityService.js';
+import { DI } from '@/di-symbols.js';
+
+export const meta = {
+	tags: ['following', 'account'],
+
+	requireCredential: true,
+
+	kind: 'read:following',
+
+	res: {
+		type: 'array',
+		optional: false, nullable: false,
+		items: {
+			type: 'object',
+			optional: false, nullable: false,
+			properties: {
+				id: {
+					type: 'string',
+					optional: false, nullable: false,
+					format: 'id',
+				},
+				follower: {
+					type: 'object',
+					optional: false, nullable: false,
+					ref: 'UserLite',
+				},
+				followee: {
+					type: 'object',
+					optional: false, nullable: false,
+					ref: 'UserLite',
+				},
+			},
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+	},
+	required: [],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.followRequestsRepository)
+		private followRequestsRepository: FollowRequestsRepository,
+
+		private followRequestEntityService: FollowRequestEntityService,
+		private queryService: QueryService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const query = this.queryService.makePaginationQuery(this.followRequestsRepository.createQueryBuilder('request'), ps.sinceId, ps.untilId)
+				.andWhere('request.followerId = :meId', { meId: me.id });
+
+			const requests = await query
+				.limit(ps.limit)
+				.getMany();
+
+			return await this.followRequestEntityService.packMany(requests, me);
+		});
+	}
+}