misskey/src/server/activitypub/followers.ts

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import { ObjectID } from 'mongodb';
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import * as Router from 'koa-router';
import config from '../../config';
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import $ from 'cafy';
import ID, { transform } from '../../misc/cafy-id';
import User from '../../models/user';
import Following from '../../models/following';
import { renderActivity } 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';
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import { setResponseType } from '../activitypub';
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export default async (ctx: Router.IRouterContext) => {
if (!ObjectID.isValid(ctx.params.user)) {
ctx.status = 404;
return;
}
const userId = new ObjectID(ctx.params.user);
// Get 'cursor' parameter
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const [cursor = null, cursorErr] = $.optional.type(ID).get(ctx.request.query.cursor);
// Get 'page' parameter
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const pageErr = !$.optional.str.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 = {
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$lt: transform(cursor)
};
}
// Get followers
const followings = await Following
.find(query, {
limit: limit + 1,
sort: { _id: -1 }
});
// 「次のページ」があるかどうか
const inStock = followings.length === limit + 1;
if (inStock) followings.pop();
const renderedFollowers = await Promise.all(followings.map(following => renderFollowUser(following.followerId)));
const rendered = renderOrderedCollectionPage(
`${partOf}?page=true${cursor ? `&cursor=${cursor}` : ''}`,
user.followersCount, renderedFollowers, partOf,
null,
inStock ? `${partOf}?page=true&cursor=${followings[followings.length - 1]._id}` : null
);
ctx.body = renderActivity(rendered);
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setResponseType(ctx);
} else {
// index page
const rendered = renderOrderedCollection(partOf, user.followersCount, `${partOf}?page=true`, null);
ctx.body = renderActivity(rendered);
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ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
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setResponseType(ctx);
}
};