1 files changed, 111 insertions, 0 deletions
diff --git a/packages/backend/src/server/api/endpoints/users/relation.ts b/packages/backend/src/server/api/endpoints/users/relation.ts
new file mode 100644
index 0000000000..32d76a5322
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/users/relation.ts
@@ -0,0 +1,111 @@
+import $ from 'cafy';
+import define from '../../define';
+import { ID } from '@/misc/cafy-id';
+import { Users } from '@/models/index';
+
+export const meta = {
+	tags: ['users'],
+
+	requireCredential: true as const,
+
+	params: {
+		userId: {
+			validator: $.either($.type(ID), $.arr($.type(ID)).unique()),
+		}
+	},
+
+	res: {
+		oneOf: [
+			{
+				type: 'object' as const,
+				optional: false as const, nullable: false as const,
+				properties: {
+					id: {
+						type: 'string' as const,
+						optional: false as const, nullable: false as const,
+						format: 'id'
+					},
+					isFollowing: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					hasPendingFollowRequestFromYou: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					hasPendingFollowRequestToYou: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					isFollowed: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					isBlocking: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					isBlocked: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					},
+					isMuted: {
+						type: 'boolean' as const,
+						optional: false as const, nullable: false as const
+					}
+				}
+			},
+			{
+				type: 'array' as const,
+				optional: false as const, nullable: false as const,
+				items: {
+					type: 'object' as const,
+					optional: false as const, nullable: false as const,
+					properties: {
+						id: {
+							type: 'string' as const,
+							optional: false as const, nullable: false as const,
+							format: 'id'
+						},
+						isFollowing: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						hasPendingFollowRequestFromYou: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						hasPendingFollowRequestToYou: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						isFollowed: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						isBlocking: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						isBlocked: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						},
+						isMuted: {
+							type: 'boolean' as const,
+							optional: false as const, nullable: false as const
+						}
+					}
+				}
+			}
+		]
+	}
+};
+
+export default define(meta, async (ps, me) => {
+	const ids = Array.isArray(ps.userId) ? ps.userId : [ps.userId];
+
+	const relations = await Promise.all(ids.map(id => Users.getRelation(me.id, id)));
+
+	return Array.isArray(ps.userId) ? relations : relations[0];
+});