101 lines
2.0 KiB
TypeScript
101 lines
2.0 KiB
TypeScript
/**
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* Module dependencies
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*/
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import $ from 'cafy';
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import Post from '../../models/post';
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import User from '../../models/user';
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import serialize from '../../serializers/user';
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module.exports = (params, me) => new Promise(async (res, rej) => {
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// Get 'user_id' parameter
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const [userId, userIdErr] = $(params.user_id).id().$;
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if (userIdErr) return rej('invalid user_id param');
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// Get 'limit' parameter
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const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
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if (limitErr) return rej('invalid limit param');
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// Lookup user
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const user = await User.findOne({
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_id: userId
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}, {
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fields: {
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_id: true
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}
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});
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if (user === null) {
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return rej('user not found');
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}
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// Fetch recent posts
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const recentPosts = await Post.find({
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user_id: user._id,
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reply_id: {
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$exists: true,
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$ne: null
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}
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}, {
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sort: {
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_id: -1
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},
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limit: 1000,
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fields: {
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_id: false,
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reply_id: true
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}
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});
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// 投稿が少なかったら中断
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if (recentPosts.length === 0) {
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return res([]);
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}
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const replyTargetPosts = await Post.find({
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_id: {
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$in: recentPosts.map(p => p.reply_id)
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},
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user_id: {
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$ne: user._id
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}
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}, {
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fields: {
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_id: false,
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user_id: true
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}
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});
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const repliedUsers = {};
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// Extract replies from recent posts
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replyTargetPosts.forEach(post => {
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const userId = post.user_id.toString();
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if (repliedUsers[userId]) {
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repliedUsers[userId]++;
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} else {
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repliedUsers[userId] = 1;
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}
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});
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// Calc peak
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let peak = 0;
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Object.keys(repliedUsers).forEach(user => {
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if (repliedUsers[user] > peak) peak = repliedUsers[user];
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});
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// Sort replies by frequency
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const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
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// Extract top replied users
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const topRepliedUsers = repliedUsersSorted.slice(0, limit);
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// Make replies object (includes weights)
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const repliesObj = await Promise.all(topRepliedUsers.map(async (user) => ({
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user: await serialize(user, me, { detail: true }),
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weight: repliedUsers[user] / peak
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})));
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// Response
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res(repliesObj);
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});
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