如何通过dialogflow聊天机器人从Firebase存储中检索图像？

Question

我需要通过我的dialogflow chatbot Google助手从Firebase存储中检索图像。我已经将映像上传到存储，并将http链接添加到firebase云数据库。如果我向Google助手（测试应用程序）询问“显示我的照片”，它应该会收到来自Firebase的图像响应。我已经在dialogflow中启用了webhook并使用index.js文件进行编码。 请帮助我添加用于图像检索的代码。 在此处填写代码

案例“ photo.database”：     请在此处填写代码。 休息;

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现有代码

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const functions = require('firebase-functions');
var admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
var firestore = admin.firestore();
// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
exports.MyInformation = functions.https.onRequest((request, response) => {

console.log("request.body.result.parameters: ", 
request.body.result.parameters);
let params = request.body.result.parameters;

switch (request.body.result.action) {
case 'write.database':
firestore.collection(${params.name}).doc(${params.document}).set(params)
.then(() => {
if((params.name) === Riyas Elliyas){
response.send({
speech:Your database has been updated with ${params.document} - 
${params.content}
});
}
else{
response.send({
speech:Database of ${params.name} has been updated with ${params.document} - 
${params.content}
});
} 
})
.catch((e => {
console.log("error: ", e);
response.send({
speech: "something went wrong when writing on database"
});
}))
break;

case 'photo.database':
*** Imaging retrieving code is here ***
break;

default:
response.send({
speech: "no action matched in webhook"
});
}
});