如何使用 Google Firebase Cloud Functions 检查位置是否在服务器上的地图范围内

Question

我想做什么：

• Function on Firebase Functions 创建地址地理编码
• 我想验证一组结果是否在地图范围内

导入FB Functions和Admin，初始化

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

在测试期间处理 CORS

const cors = require('cors');
const corsHandler = cors({origin: true});

Google 地图客户端 - google-maps-services-js

const googleMapsClient = require('@google/maps').createClient({
  key: 'xxxxxxx'
});

主要问题是我想查询数据库并让后端检查结果是否在地图范围内，过滤结果并做出响应。 我不想获取所有结果并在前端过滤它们。

exports.myFunction = functions.https.onRequest((request, response) => {


  // CORS Container - allow all request origins
  corsHandler(request, response, () => {

    // Retrieve listings data from DB
    return admin.database().ref('/listings').once('value').then(snapshots => {

      // Geocode an address.
      return googleMapsClient.geocode({
        address: '1600 Amphitheatre Parkway, Mountain View, CA'

      }, function(err, response) {

        if (!err) {

          let res = response.json.results;
          let lat = res[0]["geometry"]["location"]["lat"];
          let lng = res[0]["geometry"]["location"]["lng"];

          // Want to get the bounds here
          // let bounds = ???

          let results = [];

          // Filter snapshot results
          snapshots.forEach(snapshot => {

            // Get snapshot's position
            const position = snapshot.val().position;

            // Check if snapshot position is within map's bounds
            if (bounds.contains(position)) {
              results.push(snapshot);
            }

          });

          return response.status(200).send({
            "data": bounds
          });

        }
      });


    }).catch(e => {

      return response.status(422).send({
        "data": e
      });

    });

  });

});

获取地图的边界并检查位置对象是否在前端的边界内很容易：

map.getBounds().contains(marker.getPosition());

努力通过 Firebase Functions 使它在后端运行。

Answer 1

可以试试

  return response.status(200).send({
    "data": results
  });

反而

  return response.status(200).send({
    "data": bounds
  });