node.js - 使用 Firebase 函数验证购买

Question

我想使用 Firebase 函数和 Purchases.products: get 在我的应用中验证购买但我不知道如何使用链接中的授权范围或如何在 Firebase Functions 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;
    });

我已经设置了几乎所有东西，但我的 JavaScript 知识非常有限，不知道如何构建请求并在 Firebase 函数中获取结果

Answer 1

我对 JavaScript 知之甚少，我得到这个函数的部分原因是从我读过的所有内容中猜测出来的，我将不胜感激，我知道还有改进的余地，但它会进行验证。

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:我刚刚发现使用 Promo Codes 时会失败，因为 Promo Codes 的 orderId 为空。

使用 promise

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 保存来自 purchase 的数据 Schema$ProductPurchase，您可以在其中检查来自 Purchase 的其他值。如果您使用“许可测试”或“促销代码”，我会觉得这很有趣。在此示例中，我使用 axiosResponse.data.purchaseState 来检查购买是否仍然有效(可能是不必要的......)