From 7942f76acb5363e065b681f70f91fe785480a298 Mon Sep 17 00:00:00 2001
From: Akihiko Odaki <nekomanma@pixiv.co.jp>
Date: Mon, 2 Apr 2018 19:50:40 +0900
Subject: Implement Follow activity

---
 src/remote/activitypub/act/follow.ts | 51 ++++++++++++++++++++++++++++++++++++
 src/remote/activitypub/act/index.ts  |  4 +++
 2 files changed, 55 insertions(+)
 create mode 100644 src/remote/activitypub/act/follow.ts

(limited to 'src/remote')

diff --git a/src/remote/activitypub/act/follow.ts b/src/remote/activitypub/act/follow.ts
new file mode 100644
index 0000000000..ec9e080dfc
--- /dev/null
+++ b/src/remote/activitypub/act/follow.ts
@@ -0,0 +1,51 @@
+import { MongoError } from 'mongodb';
+import parseAcct from '../../../acct/parse';
+import Following from '../../../models/following';
+import User from '../../../models/user';
+import config from '../../../config';
+import queue from '../../../queue';
+
+export default async (actor, activity) => {
+	const prefix = config.url + '/@';
+	const id = activity.object.id || activity.object;
+	let following;
+
+	if (!id.startsWith(prefix)) {
+		return null;
+	}
+
+	const { username, host } = parseAcct(id.slice(prefix.length));
+	if (host !== null) {
+		throw new Error();
+	}
+
+	const followee = await User.findOne({ username, host });
+	if (followee === null) {
+		throw new Error();
+	}
+
+	try {
+		following = await Following.insert({
+			createdAt: new Date(),
+			followerId: actor._id,
+			followeeId: followee._id
+		});
+	} catch (exception) {
+		// duplicate key error
+		if (exception instanceof MongoError && exception.code === 11000) {
+			return null;
+		}
+
+		throw exception;
+	}
+
+	await new Promise((resolve, reject) => {
+		queue.create('http', { type: 'follow', following: following._id }).save(error => {
+			if (error) {
+				reject(error);
+			} else {
+				resolve(null);
+			}
+		});
+	});
+};
diff --git a/src/remote/activitypub/act/index.ts b/src/remote/activitypub/act/index.ts
index 06d662c191..24320dcb1d 100644
--- a/src/remote/activitypub/act/index.ts
+++ b/src/remote/activitypub/act/index.ts
@@ -1,4 +1,5 @@
 import create from './create';
+import follow from './follow';
 import createObject from '../create';
 import Resolver from '../resolver';
 
@@ -15,6 +16,9 @@ export default (actor, value, distribute) => {
 		case 'Create':
 			return create(resolver, actor, object, distribute);
 
+		case 'Follow':
+			return follow(actor, object);
+
 		default:
 			return null;
 		}
-- 
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