Initial commit

cloudfunctions/sendGreeting/index.js

@@ -0,0 +1,53 @@
+const cloud = require('wx-server-sdk')
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+
+exports.main = async (event, context) => {
+  const { OPENID } = cloud.getWXContext()
+  const { toUserId, petId } = event
+
+  if (!toUserId) return { code: -1, message: '缺少目标用户' }
+  if (toUserId === OPENID) return { code: -1, message: '不能给自己打招呼' }
+
+  try {
+    // 防刷：5分钟内同一对用户只能打一次招呼
+    const cooldownMs = 5 * 60 * 1000
+    const recent = await db.collection('messages')
+      .where({
+        fromId: OPENID,
+        toId: toUserId,
+        type: 'greeting',
+        createdAt: db.command.gt(new Date(Date.now() - cooldownMs).toISOString()),
+      })
+      .count()
+
+    if (recent.total > 0) {
+      return { code: -1, message: '打招呼太频繁了，稍后再试' }
+    }
+
+    // 获取发送者信息
+    const senderRes = await db.collection('users')
+      .where({ openid: OPENID })
+      .field({ nickName: true, pets: true })
+      .get()
+    const sender = senderRes.data[0]
+    const pet = sender?.pets?.find(p => p._id === petId) || sender?.pets?.[0]
+
+    const greeting = `${sender?.nickName || '小伙伴'} 想认识你的宠物！${pet ? `TA 的 ${pet.name} 向你打了个招呼 🐾` : '来聊聊吧 🐾'}`
+
+    await db.collection('messages').add({
+      data: {
+        fromId: OPENID,
+        toId: toUserId,
+        content: greeting,
+        type: 'greeting',
+        isRead: false,
+        createdAt: db.serverDate(),
+      },
+    })
+
+    return { code: 0, data: null }
+  } catch (e) {
+    return { code: -1, message: e.message }
+  }
+}