From 0986301788a40663ced0aa9d6d8a97b099b622b1 Mon Sep 17 00:00:00 2001
From: mei23 <m@m544.net>
Date: Tue, 14 Aug 2018 20:13:32 +0900
Subject: [PATCH] Implement ActivityPub Followers/Following/Outbox

---
 .../activitypub/renderer/follow-user.ts       | 16 ++++
 .../renderer/ordered-collection-page.ts       | 23 +++++
 .../renderer/ordered-collection.ts            | 25 +++--
 src/server/activitypub.ts                     | 71 ++------------
 src/server/activitypub/followers.ts           | 80 ++++++++++++++++
 src/server/activitypub/following.ts           | 80 ++++++++++++++++
 src/server/activitypub/outbox.ts              | 96 +++++++++++++++++++
 7 files changed, 321 insertions(+), 70 deletions(-)
 create mode 100644 src/remote/activitypub/renderer/follow-user.ts
 create mode 100644 src/remote/activitypub/renderer/ordered-collection-page.ts
 create mode 100644 src/server/activitypub/followers.ts
 create mode 100644 src/server/activitypub/following.ts
 create mode 100644 src/server/activitypub/outbox.ts

diff --git a/src/remote/activitypub/renderer/follow-user.ts b/src/remote/activitypub/renderer/follow-user.ts
new file mode 100644
index 000000000..9a488d392
--- /dev/null
+++ b/src/remote/activitypub/renderer/follow-user.ts
@@ -0,0 +1,16 @@
+import config from '../../../config';
+import * as mongo from 'mongodb';
+import User, { isLocalUser } from '../../../models/user';
+
+/**
+ * Convert (local|remote)(Follower|Followee)ID to URL
+ * @param id Follower|Followee ID
+ */
+export default async function renderFollowUser(id: mongo.ObjectID): Promise<any> {
+
+	const user = await User.findOne({
+		_id: id
+	});
+
+	return isLocalUser(user) ? `${config.url}/users/${user._id}` : user.uri;
+}
diff --git a/src/remote/activitypub/renderer/ordered-collection-page.ts b/src/remote/activitypub/renderer/ordered-collection-page.ts
new file mode 100644
index 000000000..83af07870
--- /dev/null
+++ b/src/remote/activitypub/renderer/ordered-collection-page.ts
@@ -0,0 +1,23 @@
+/**
+ * Render OrderedCollectionPage
+ * @param id URL of self
+ * @param totalItems Number of total items
+ * @param orderedItems Items
+ * @param partOf URL of base
+ * @param prev URL of prev page (optional)
+ * @param next URL of next page (optional)
+ */
+export default function(id: string, totalItems: any, orderedItems: any, partOf: string, prev: string, next: string) {
+	const page = {
+		id,
+		partOf,
+		type: 'OrderedCollectionPage',
+		totalItems,
+		orderedItems
+	} as any;
+
+	if (prev) page.prev = prev;
+	if (next) page.next = next;
+
+	return page;
+}
diff --git a/src/remote/activitypub/renderer/ordered-collection.ts b/src/remote/activitypub/renderer/ordered-collection.ts
index 9d543b1e1..3c448cf87 100644
--- a/src/remote/activitypub/renderer/ordered-collection.ts
+++ b/src/remote/activitypub/renderer/ordered-collection.ts
@@ -1,6 +1,19 @@
-export default (id: string, totalItems: any, orderedItems: any) => ({
-	id,
-	type: 'OrderedCollection',
-	totalItems,
-	orderedItems
-});
+/**
+ * Render OrderedCollection
+ * @param id URL of self
+ * @param totalItems Total number of items
+ * @param first URL of first page (optional)
+ * @param last URL of last page (optional)
+ */
+export default function(id: string, totalItems: any, first: string, last: string) {
+	const page: any = {
+		id,
+		type: 'OrderedCollection',
+		totalItems,
+	};
+
+	if (first) page.first = first;
+	if (last) page.last = last;
+
+	return page;
+}
diff --git a/src/server/activitypub.ts b/src/server/activitypub.ts
index 7d6fe0926..c2dec2b99 100644
--- a/src/server/activitypub.ts
+++ b/src/server/activitypub.ts
@@ -10,8 +10,9 @@ import User, { isLocalUser, ILocalUser, IUser } from '../models/user';
 import renderNote from '../remote/activitypub/renderer/note';
 import renderKey from '../remote/activitypub/renderer/key';
 import renderPerson from '../remote/activitypub/renderer/person';
-import renderOrderedCollection from '../remote/activitypub/renderer/ordered-collection';
-import config from '../config';
+import Outbox from './activitypub/outbox';
+import Followers from './activitypub/followers';
+import Following from './activitypub/following';
 
 // Init router
 const router = new Router();
@@ -64,72 +65,14 @@ router.get('/notes/:note', async (ctx, next) => {
 	ctx.body = pack(await renderNote(note));
 });
 
-// outbot
-router.get('/users/:user/outbox', async ctx => {
-	const userId = new mongo.ObjectID(ctx.params.user);
-
-	const user = await User.findOne({
-		_id: userId,
-		host: null
-	});
-
-	if (user === null) {
-		ctx.status = 404;
-		return;
-	}
-
-	const notes = await Note.find({ userId: user._id }, {
-		limit: 10,
-		sort: { _id: -1 }
-	});
-
-	const renderedNotes = await Promise.all(notes.map(note => renderNote(note)));
-	const rendered = renderOrderedCollection(`${config.url}/users/${userId}/inbox`, user.notesCount, renderedNotes);
-
-	ctx.body = pack(rendered);
-});
+// outbox
+router.get('/users/:user/outbox', Outbox);
 
 // followers
-router.get('/users/:user/followers', async ctx => {
-	const userId = new mongo.ObjectID(ctx.params.user);
-
-	const user = await User.findOne({
-		_id: userId,
-		host: null
-	});
-
-	if (user === null) {
-		ctx.status = 404;
-		return;
-	}
-
-	// TODO: Implement fetch and render
-
-	const rendered = renderOrderedCollection(`${config.url}/users/${userId}/followers`, 0, []);
-
-	ctx.body = pack(rendered);
-});
+router.get('/users/:user/followers', Followers);
 
 // following
-router.get('/users/:user/following', async ctx => {
-	const userId = new mongo.ObjectID(ctx.params.user);
-
-	const user = await User.findOne({
-		_id: userId,
-		host: null
-	});
-
-	if (user === null) {
-		ctx.status = 404;
-		return;
-	}
-
-	// TODO: Implement fetch and render
-
-	const rendered = renderOrderedCollection(`${config.url}/users/${userId}/following`, 0, []);
-
-	ctx.body = pack(rendered);
-});
+router.get('/users/:user/following', Following);
 
 // publickey
 router.get('/users/:user/publickey', async ctx => {
diff --git a/src/server/activitypub/followers.ts b/src/server/activitypub/followers.ts
new file mode 100644
index 000000000..d51d45b1c
--- /dev/null
+++ b/src/server/activitypub/followers.ts
@@ -0,0 +1,80 @@
+import * as mongo from 'mongodb';
+import * as Koa from 'koa';
+import config from '../../config';
+import $ from 'cafy'; import ID from '../../misc/cafy-id';
+import User from '../../models/user';
+import Following from '../../models/following';
+import pack from '../../remote/activitypub/renderer';
+import renderOrderedCollection from '../../remote/activitypub/renderer/ordered-collection';
+import renderOrderedCollectionPage from '../../remote/activitypub/renderer/ordered-collection-page';
+import renderFollowUser from '../../remote/activitypub/renderer/follow-user';
+
+export default async (ctx: Koa.Context) => {
+	const userId = new mongo.ObjectID(ctx.params.user);
+
+	// Get 'cursor' parameter
+	const [cursor = null, cursorErr] = $.type(ID).optional.get(ctx.request.query.cursor);
+
+	// Get 'page' parameter
+	const pageErr = !$.str.optional.or(['true', 'false']).ok(ctx.request.query.page);
+	const page: boolean = ctx.request.query.page === 'true';
+
+	// Validate parameters
+	if (cursorErr || pageErr) {
+		ctx.status = 400;
+		return;
+	}
+
+	// Verify user
+	const user = await User.findOne({
+		_id: userId,
+		host: null
+	});
+
+	if (user === null) {
+		ctx.status = 404;
+		return;
+	}
+
+	const limit = 10;
+	const partOf = `${config.url}/users/${userId}/followers`;
+
+	if (page) {
+		// Construct query
+		const query = {
+			followeeId: user._id
+		} as any;
+
+		// カーソルが指定されている場合
+		if (cursor) {
+			query._id = {
+				$lt: cursor
+			};
+		}
+
+		// Get followers
+		const followings = await Following
+			.find(query, {
+				limit: limit + 1,
+				sort: { _id: -1 }
+			});
+
+		// 「次のページ」があるかどうか
+		const inStock = followings.length === limit + 1;
+		if (inStock) followings.pop();
+
+		const renderedFollowers = await Promise.all(followings.map(following => renderFollowUser(following.followerId)));
+		const rendered = renderOrderedCollectionPage(
+			`${partOf}?page=true${cursor ? `&cursor=${cursor}` : ''}`,
+			user.followersCount, renderedFollowers, partOf,
+			null,
+			inStock ? `${partOf}?page=true&cursor=${followings[followings.length - 1]._id}` : null
+		);
+
+		ctx.body = pack(rendered);
+	} else {
+		// index page
+		const rendered = renderOrderedCollection(partOf, user.followersCount, `${partOf}?page=true`, null);
+		ctx.body = pack(rendered);
+	}
+};
diff --git a/src/server/activitypub/following.ts b/src/server/activitypub/following.ts
new file mode 100644
index 000000000..7e496f590
--- /dev/null
+++ b/src/server/activitypub/following.ts
@@ -0,0 +1,80 @@
+import * as mongo from 'mongodb';
+import * as Koa from 'koa';
+import config from '../../config';
+import $ from 'cafy'; import ID from '../../misc/cafy-id';
+import User from '../../models/user';
+import Following from '../../models/following';
+import pack from '../../remote/activitypub/renderer';
+import renderOrderedCollection from '../../remote/activitypub/renderer/ordered-collection';
+import renderOrderedCollectionPage from '../../remote/activitypub/renderer/ordered-collection-page';
+import renderFollowUser from '../../remote/activitypub/renderer/follow-user';
+
+export default async (ctx: Koa.Context) => {
+	const userId = new mongo.ObjectID(ctx.params.user);
+
+	// Get 'cursor' parameter
+	const [cursor = null, cursorErr] = $.type(ID).optional.get(ctx.request.query.cursor);
+
+	// Get 'page' parameter
+	const pageErr = !$.str.optional.or(['true', 'false']).ok(ctx.request.query.page);
+	const page: boolean = ctx.request.query.page === 'true';
+
+	// Validate parameters
+	if (cursorErr || pageErr) {
+		ctx.status = 400;
+		return;
+	}
+
+	// Verify user
+	const user = await User.findOne({
+		_id: userId,
+		host: null
+	});
+
+	if (user === null) {
+		ctx.status = 404;
+		return;
+	}
+
+	const limit = 10;
+	const partOf = `${config.url}/users/${userId}/following`;
+
+	if (page) {
+		// Construct query
+		const query = {
+			followerId: user._id
+		} as any;
+
+		// カーソルが指定されている場合
+		if (cursor) {
+			query._id = {
+				$lt: cursor
+			};
+		}
+
+		// Get followings
+		const followings = await Following
+			.find(query, {
+				limit: limit + 1,
+				sort: { _id: -1 }
+			});
+
+		// 「次のページ」があるかどうか
+		const inStock = followings.length === limit + 1;
+		if (inStock) followings.pop();
+
+		const renderedFollowees = await Promise.all(followings.map(following => renderFollowUser(following.followeeId)));
+		const rendered = renderOrderedCollectionPage(
+			`${partOf}?page=true${cursor ? `&cursor=${cursor}` : ''}`,
+			user.followingCount, renderedFollowees, partOf,
+			null,
+			inStock ? `${partOf}?page=true&cursor=${followings[followings.length - 1]._id}` : null
+		);
+
+		ctx.body = pack(rendered);
+	} else {
+		// index page
+		const rendered = renderOrderedCollection(partOf, user.followingCount, `${partOf}?page=true`, null);
+		ctx.body = pack(rendered);
+	}
+};
diff --git a/src/server/activitypub/outbox.ts b/src/server/activitypub/outbox.ts
new file mode 100644
index 000000000..e441e3dc4
--- /dev/null
+++ b/src/server/activitypub/outbox.ts
@@ -0,0 +1,96 @@
+import * as mongo from 'mongodb';
+import * as Koa from 'koa';
+import config from '../../config';
+import $ from 'cafy'; import ID from '../../misc/cafy-id';
+import User from '../../models/user';
+import pack from '../../remote/activitypub/renderer';
+import renderOrderedCollection from '../../remote/activitypub/renderer/ordered-collection';
+import renderOrderedCollectionPage from '../../remote/activitypub/renderer/ordered-collection-page';
+
+import Note from '../../models/note';
+import renderNote from '../../remote/activitypub/renderer/note';
+
+export default async (ctx: Koa.Context) => {
+	const userId = new mongo.ObjectID(ctx.params.user);
+
+	// Get 'sinceId' parameter
+	const [sinceId, sinceIdErr] = $.type(ID).optional.get(ctx.request.query.since_id);
+
+	// Get 'untilId' parameter
+	const [untilId, untilIdErr] = $.type(ID).optional.get(ctx.request.query.until_id);
+
+	// Get 'page' parameter
+	const pageErr = !$.str.optional.or(['true', 'false']).ok(ctx.request.query.page);
+	const page: boolean = ctx.request.query.page === 'true';
+
+	// Validate parameters
+	if (sinceIdErr || untilIdErr || pageErr || [sinceId, untilId].filter(x => x != null).length > 1) {
+		ctx.status = 400;
+		return;
+	}
+
+	// Verify user
+	const user = await User.findOne({
+		_id: userId,
+		host: null
+	});
+
+	if (user === null) {
+		ctx.status = 404;
+		return;
+	}
+
+	const limit = 20;
+	const partOf = `${config.url}/users/${userId}/outbox`;
+
+	if (page) {
+		//#region Construct query
+		const sort = {
+			_id: -1
+		};
+
+		const query = {
+			userId: user._id,
+			$or: [ { visibility: 'public' }, { visibility: 'home' } ],
+			text: { $ne: null }	// exclude renote, but include quote
+		} as any;
+
+		if (sinceId) {
+			sort._id = 1;
+			query._id = {
+				$gt: sinceId
+			};
+		} else if (untilId) {
+			query._id = {
+				$lt: untilId
+			};
+		}
+		//#endregion
+
+		// Issue query
+		const notes = await Note
+			.find(query, {
+				limit: limit,
+				sort: sort
+			});
+
+		if (sinceId) notes.reverse();
+
+		const renderedNotes = await Promise.all(notes.map(note => renderNote(note)));
+		const rendered = renderOrderedCollectionPage(
+			`${partOf}?page=true${sinceId ? `&since_id=${sinceId}` : ''}${untilId ? `&until_id=${untilId}` : ''}`,
+			user.notesCount, renderedNotes, partOf,
+			notes.length > 0 ? `${partOf}?page=true&since_id=${notes[0]._id}` : null,
+			notes.length > 0 ? `${partOf}?page=true&until_id=${notes[notes.length - 1]._id}` : null
+		);
+
+		ctx.body = pack(rendered);
+	} else {
+		// index page
+		const rendered = renderOrderedCollection(partOf, user.notesCount,
+			`${partOf}?page=true`,
+			`${partOf}?page=true&since_id=000000000000000000000000`
+		);
+		ctx.body = pack(rendered);
+	}
+};