使用 Firebase 函数验证购买

Question

我想使用 Firebase Functions 和 Purchases.products: get 在我的应用中验证购买但我不知道如何使用 link 中的授权范围或如何在 Firebase 函数中构建请求。这是我目前所拥有的：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const google = require("googleapis");
const publisher = google.androidpublisher('v2');
admin.initializeApp(functions.config().firebase);

exports.validatePurchases = functions.database
    .ref('/purchases/{uId}/{orderId}')
    .onWrite((event) => {
        const purchase = event.data.val();
        const token = purchase.token;
        const packageName = purchase.package_name;
        const sku = purchase.sku;
        const signature = purchase.signature;
        const uri = "https://www.googleapis.com/androidpublisher/v2/applications/" + packageName + "/purchases/products/" + sku + "/tokens/" + token;

        return TODO;
    });

我已经设置了大部分内容，但我的 JavaScript 知识非常有限，不知道如何在 Firebase 函数中构建请求和获取结果

Answer 1

我对 JavaScript 了解不多，我部分地从我所读的所有内容中猜测了这个函数，我将不胜感激更正，我知道还有改进的余地，但它确实进行了验证。

这是我用来验证购买的功能：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {google} = require("googleapis");
const publisher = google.androidpublisher('v2');
const authClient = new google.auth.JWT({
    email: 'Service Account Email',
    key: '-----BEGIN PRIVATE KEY-----\n**********************************************************************************==\n-----END PRIVATE KEY-----\n',
    scopes: ['https://www.googleapis.com/auth/androidpublisher']
});
admin.initializeApp();

exports.validatePurchases = functions.database
    .ref('/purchases/{uId}/{orderId}')
    .onCreate((event, context) => {
        const purchase = event.val();
        if (purchase.is_processed === true) {
            console.log('Purchase already processed!, exiting');
            return null;
        }
        const orderId = context.params.orderId;
        const dbRoot = event.ref.root;
        const package_name = purchase.package_name;
        const sku = purchase.sku;
        const my_token = purchase.token;

        authClient.authorize((err, result) => {
            if (err) {
                console.log(err);
            }
            publisher.purchases.products.get({
                auth: authClient,
                packageName: package_name,
                productId: sku,
                token: my_token
            }, (err, response) => {
                if (err) {
                    console.log(err);
                }
                // Result Status must be equals to 200 so that the purchase is valid
                if (response.status === 200) {
                    return event.ref.child('is_validated').set(true);
                } else {
                    return event.ref.child('is_validated').set(false);
                }
            });
        });
        return null;
    });

更新： 我刚刚发现，当使用 促销代码 时，这将失败，因为 orderId 对于促销代码是空的。

使用承诺

return authClient.authorize()
        // authClient.authorize() returns a credentials Object
        .then(credentials => {
            return publisher.purchases.products.get({
                auth: authClient,
                packageName: packageName,
                productId: sku,
                token: token
            });
        })
        // publisher.purchases.products.get() Returns a axiosResponse object with Purchase data within and the status that should be enough for the validation
        .then(axiosResponse => {
                if (axiosResponse.status === 200 && axiosResponse.data.purchaseState === 0) {
                // Your purchase is valid, do your thing
                } else {
                    return event.ref.set(null);
                }
            })
            .catch(reason => {
                console.log(`Rejection Code: ${reason.code}`);
                console.log(`Rejection Message: ${reason.message}`);
                return event.ref.set(null);
            });

据我了解，axiosResponse.status === 200 应该足以验证购买，但请注意，axiosResponse.data 包含来自 purchase Schema$ProductPurchase 的数据，您可以在其中查看采购的其他价值。如果您使用 "Licensing Testing" 或 "Promo Codes"，我觉得这很有趣。在此示例中，我使用 axiosResponse.data.purchaseState 来检查购买是否仍然有效（可能不需要...）

使用 Firebase 函数验证购买

Verify a Purchase using Firebase Functions

in-app-purchase

node.js

firebase

google-play-developer-api

google-cloud-functions