259 lines
8.2 KiB
JavaScript
259 lines
8.2 KiB
JavaScript
const cloud = require('wx-server-sdk')
|
|
|
|
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
|
|
const db = cloud.database()
|
|
const _ = db.command
|
|
|
|
// Query a collection that may not exist yet (created lazily on first write).
|
|
// Returns an empty result instead of throwing "collection not exists".
|
|
async function safeGet(collection, where, limit = 200) {
|
|
try {
|
|
return await db.collection(collection).where(where).limit(limit).get()
|
|
} catch (e) {
|
|
return { data: [] }
|
|
}
|
|
}
|
|
|
|
function formatTimeText(ts) {
|
|
const diff = Date.now() - ts
|
|
const mins = Math.floor(diff / 60000)
|
|
if (mins < 1) return '刚刚'
|
|
if (mins < 60) return `${mins} 分钟前`
|
|
const hours = Math.floor(mins / 60)
|
|
if (hours < 24) return `${hours} 小时前`
|
|
const days = Math.floor(hours / 24)
|
|
if (days === 1) return '昨天'
|
|
if (days < 7) return `${days} 天前`
|
|
const d = new Date(ts)
|
|
return `${d.getMonth() + 1}月${d.getDate()}日`
|
|
}
|
|
|
|
function normalizeKeyword(keyword) {
|
|
return String(keyword || '').trim().toLowerCase()
|
|
}
|
|
|
|
function postMatchesKeyword(post, keyword) {
|
|
if (!keyword) return true
|
|
|
|
return [
|
|
post.content,
|
|
post.locationText,
|
|
post.authorSnapshot && post.authorSnapshot.name,
|
|
post.petSnapshot && post.petSnapshot.name,
|
|
post.petSnapshot && post.petSnapshot.breed,
|
|
...(Array.isArray(post.topics) ? post.topics : [])
|
|
]
|
|
.filter(Boolean)
|
|
.join(' ')
|
|
.toLowerCase()
|
|
.includes(keyword)
|
|
}
|
|
|
|
function isCloudFileId(value) {
|
|
return typeof value === 'string' && value.startsWith('cloud://')
|
|
}
|
|
|
|
function extractMediaUrl(media) {
|
|
if (!media) return ''
|
|
if (typeof media === 'string') return media
|
|
return media.url || media.fileId || media.fileID || ''
|
|
}
|
|
|
|
async function resolveTempUrlMap(urls) {
|
|
const fileIds = [...new Set(urls.filter(isCloudFileId))]
|
|
if (!fileIds.length) return new Map()
|
|
|
|
try {
|
|
const result = await cloud.getTempFileURL({ fileList: fileIds })
|
|
const fileList = Array.isArray(result.fileList) ? result.fileList : []
|
|
return new Map(fileList.map(file => [
|
|
file.fileID || file.fileId,
|
|
file.tempFileURL || file.tempFileUrl || ''
|
|
]).filter(([fileId, tempUrl]) => fileId && tempUrl))
|
|
} catch (e) {
|
|
return new Map()
|
|
}
|
|
}
|
|
|
|
function readableUrl(url, tempUrlMap) {
|
|
if (!url) return ''
|
|
if (!isCloudFileId(url)) return url
|
|
return tempUrlMap.get(url) || ''
|
|
}
|
|
|
|
async function queryPosts(query, limit, cursor) {
|
|
const nextQuery = { ...query }
|
|
if (cursor) nextQuery.createdAt = _.lt(Number(cursor))
|
|
|
|
return db.collection('posts')
|
|
.where(nextQuery)
|
|
.orderBy('createdAt', 'desc')
|
|
.limit(limit)
|
|
.get()
|
|
}
|
|
|
|
async function loadTopicOptions(query) {
|
|
try {
|
|
const topicQuery = { ...query }
|
|
delete topicQuery.topics
|
|
delete topicQuery.createdAt
|
|
|
|
const res = await db.collection('posts')
|
|
.where(topicQuery)
|
|
.orderBy('createdAt', 'desc')
|
|
.limit(100)
|
|
.get()
|
|
|
|
const counts = new Map()
|
|
res.data.forEach(post => {
|
|
const postTopics = post.topics || []
|
|
postTopics.forEach(topic => {
|
|
if (!topic) return
|
|
counts.set(topic, (counts.get(topic) || 0) + 1)
|
|
})
|
|
})
|
|
|
|
return [...counts.entries()]
|
|
.sort((a, b) => b[1] - a[1])
|
|
.slice(0, 12)
|
|
.map(([topic]) => topic)
|
|
} catch (e) {
|
|
return []
|
|
}
|
|
}
|
|
|
|
exports.main = async event => {
|
|
const { OPENID } = cloud.getWXContext()
|
|
const pageSize = Math.min(event.pageSize || 20, 50)
|
|
const keyword = normalizeKeyword(event.keyword)
|
|
const query = { visibility: 'public' }
|
|
|
|
if (event.topic) query.topics = event.topic
|
|
|
|
// Follow channel: only posts from users I follow (plus my own).
|
|
if (event.channel === 'follow') {
|
|
if (!OPENID) return { list: [], nextCursor: '' }
|
|
const meRes = await db.collection('users').where({ openid: OPENID }).limit(1).get()
|
|
if (!meRes.data.length) return { list: [], nextCursor: '' }
|
|
const meId = meRes.data[0]._id
|
|
const followRes = await safeGet('follows', { followerId: meId }, 500)
|
|
const authorOpenids = followRes.data.map(f => f.followeeOpenid).filter(Boolean)
|
|
authorOpenids.push(OPENID)
|
|
query.authorOpenid = _.in(authorOpenids)
|
|
query.visibility = _.in(['public', 'friends'])
|
|
}
|
|
|
|
const topics = event.cursor ? [] : await loadTopicOptions(query)
|
|
const fetchLimit = keyword ? 50 : pageSize
|
|
const matchedPosts = []
|
|
let scanCursor = event.cursor || ''
|
|
let nextCursor = ''
|
|
|
|
while (matchedPosts.length < pageSize) {
|
|
const res = await queryPosts(query, fetchLimit, scanCursor)
|
|
if (!res.data.length) break
|
|
|
|
for (const post of res.data) {
|
|
scanCursor = String(post.createdAt || '')
|
|
if (!postMatchesKeyword(post, keyword)) continue
|
|
|
|
matchedPosts.push(post)
|
|
if (matchedPosts.length >= pageSize) {
|
|
nextCursor = scanCursor
|
|
break
|
|
}
|
|
}
|
|
|
|
if (matchedPosts.length >= pageSize || res.data.length < fetchLimit) break
|
|
scanCursor = String(res.data[res.data.length - 1].createdAt || '')
|
|
}
|
|
|
|
if (!matchedPosts.length) return { list: [], nextCursor: '', topics }
|
|
|
|
const postIds = matchedPosts.map(p => p._id)
|
|
|
|
// Batch-check liked status, skip if no valid OPENID (non-WeChat context).
|
|
let likedSet = new Set()
|
|
if (OPENID) {
|
|
const likedRes = await safeGet('postLikes', { openid: OPENID, postId: _.in(postIds) })
|
|
likedSet = new Set(likedRes.data.map(l => l.postId))
|
|
}
|
|
|
|
// Resolve authors' current profile (real avatar image) so feed avatars load
|
|
// and stay fresh, even for posts whose snapshot predates avatar upload.
|
|
const authorIds = [...new Set(matchedPosts.map(p => p.authorId).filter(Boolean))]
|
|
const authorMap = new Map()
|
|
for (let i = 0; i < authorIds.length; i += 100) {
|
|
const chunk = authorIds.slice(i, i + 100)
|
|
const usersRes = await safeGet('users', { _id: _.in(chunk) }, 100)
|
|
usersRes.data.forEach(u => authorMap.set(u._id, u))
|
|
}
|
|
|
|
const authorOpenids = [...new Set(matchedPosts.map(p => p.authorOpenid).filter(Boolean))]
|
|
const authorOpenidMap = new Map()
|
|
for (let i = 0; i < authorOpenids.length; i += 100) {
|
|
const chunk = authorOpenids.slice(i, i + 100)
|
|
const usersRes = await safeGet('users', { openid: _.in(chunk) }, 100)
|
|
usersRes.data.forEach(u => authorOpenidMap.set(u.openid, u))
|
|
}
|
|
const findAuthor = post => authorMap.get(post.authorId) || authorOpenidMap.get(post.authorOpenid)
|
|
|
|
// Real presence per author: a recent, visible location (same signal as 附近).
|
|
const ONLINE_WINDOW_MS = 5 * 60 * 1000
|
|
const onlineNow = Date.now()
|
|
const onlineSet = new Set()
|
|
for (let i = 0; i < authorOpenids.length; i += 100) {
|
|
const chunk = authorOpenids.slice(i, i + 100)
|
|
const locRes = await safeGet('locations', { openid: _.in(chunk) }, 100)
|
|
locRes.data.forEach(loc => {
|
|
if (loc.visible && loc.updatedAt && onlineNow - loc.updatedAt < ONLINE_WINDOW_MS) onlineSet.add(loc.openid)
|
|
})
|
|
}
|
|
|
|
const assetUrls = []
|
|
matchedPosts.forEach(post => {
|
|
const author = findAuthor(post)
|
|
assetUrls.push((author && author.avatarUrl) || post.authorSnapshot?.avatarUrl || '')
|
|
if (Array.isArray(post.media)) {
|
|
post.media.forEach(media => assetUrls.push(extractMediaUrl(media)))
|
|
}
|
|
})
|
|
const tempUrlMap = await resolveTempUrlMap(assetUrls)
|
|
|
|
const list = matchedPosts.map(post => {
|
|
const author = findAuthor(post)
|
|
const media = Array.isArray(post.media)
|
|
? post.media
|
|
.map(extractMediaUrl)
|
|
.map(url => readableUrl(url, tempUrlMap))
|
|
.filter(Boolean)
|
|
: []
|
|
|
|
return {
|
|
_id: post._id,
|
|
author: {
|
|
id: (author && author._id) || post.authorId || '',
|
|
name: (author && author.nickname) || post.authorSnapshot?.name || '用户',
|
|
avatarKey: (author && author.avatarKey) || post.authorSnapshot?.avatarKey || 'gradient-avatar-1',
|
|
avatarUrl: readableUrl((author && author.avatarUrl) || post.authorSnapshot?.avatarUrl || '', tempUrlMap),
|
|
online: onlineSet.has(post.authorOpenid)
|
|
},
|
|
pet: post.petSnapshot || { name: '', breed: '' },
|
|
body: post.content || '',
|
|
topics: post.topics || [],
|
|
media,
|
|
mediaTone: post.mediaTone || 'pet-1',
|
|
sticker: post.sticker || undefined,
|
|
locationText: post.locationText || '',
|
|
timeText: formatTimeText(post.createdAt || Date.now()),
|
|
counts: {
|
|
likes: post.counts?.likes || 0,
|
|
comments: post.counts?.comments || 0
|
|
},
|
|
likedByMe: likedSet.has(post._id)
|
|
}
|
|
})
|
|
|
|
return { list, nextCursor, topics }
|
|
}
|