如何在服务器上验证Admob奖励的视频广告?

现在可以使用 Server-Side Verification (SSV) Callbacks.

服务器端验证回调是URL请求,由Google扩展查询参数,由Google发送到外部系统,通知其用户与奖励视频广告交互应获得奖励。奖励视频SSV(服务器端验证)回调提供了额外的一层保护,防止欺骗客户端回调以奖励用户。

不确定这是否与Firebase相关,但以下是一些详细信息,以防有人使用Node/JS。可以使用节点的内置 crypto 图书馆第一 fetch 可用的Google AdMob verifier密钥来自 https://gstatic.com/admob/reward/verifier-keys.json 。

然后需要遍历返回的JSON keys 阵列并抓住 pem 与 req.query.key_id 输入的参数 req.url 一串

然后,我们希望验证签名的“消息”是传入的 需求。url地址 参数之间的子字符串 ? 符号和 &signature... 字符串。

现在我们可以轻松验证:

   const verifier = crypto.createVerify("sha256");
   
   verifier.update(message);
   
   if(verifier.verify(pem, req.query.signature, "base64"))
      console.log("Ad was successfully verified.");
   else
      console.log("Ad could not be verified - quick call the cops !");

需要注意的一点是,您可能需要 unescape(...) 你的 需求。url地址 字符串,因为某些字符可能已转义。我在这件事上纠结了好一两个小时。您可以使用节点的内置 querystring 图书馆

现在不行。根据我最近收集的信息,该功能已经在一段时间内处于封闭测试状态。我能找到的最后一个提及是在链接讨论中,据推测,谷歌的某个人表示,该功能将很快向公众推出。该职位从1月22日开始。

https://groups.google.com/forum/#!topic/google-admob-ads-sdk/weXTAGZfYQ8

如果你们想为Admob SSV在Golang上寻找一种简单的方法。

就用这个 hiyali/go-lib-ssv ,希望挽救您的生命:)

我知道有点晚了,但这里有一段代码帮助了我。它是针对节点用户的javascript。 https://github.com/hypeben/admob-rewarded-ads-ssv

const queryString = require('query-string');
const crypto = require('crypto');
const axios = require('axios');
const GOOGLE_AD_KEY_URL = 'https://gstatic.com/admob/reward/verifier-keys.json';

/**
 * Fetches the google public keys for the admob providers.
 * These keys changes time to time.
 */
 const getGoogleKeysMap = async () => {
 let googleKeyRes = await axios.get(GOOGLE_AD_KEY_URL);
 let {keys} = googleKeyRes.data;
 if (!keys) {
 throw new Error('No keys found from google keys');
 }
 /** For each of the keys array save it base 64 in decoded form in the key map */
 let keyMap = {};
 keys.forEach(k => {
 keyMap[`${k.keyId}`] = crypto.createPublicKey(k.pem);
 console.log(keyMap[`${k.keyId}`]);
 });
 return keyMap;
 };

/**
 * Verifies the callback url query params string,
 * Resolves the promise if verification was successful, else fails.
 * Wanna 'debug' then pass the second parameter as true.
  * @param {String} queryUrl
  * @param {Boolean} debug 
 */
async function verify(queryUrl, debug) {

try {

if (typeof queryUrl !== "string") throw new TypeError("URL needs to be string!");

/**
 * Request coming as callback from admob must contain the 'signature' and the  'user_id'.
 * For more info https://developers.google.com/admob/android/rewarded-video-ssv
 */
const {signature, key_id} = queryString.parse(queryUrl);
if (!signature) {
  throw new Error('No signature value exist in the URL param');
}

if(debug) {
  console.debug('Signature and KeyId ---');
  console.debug(signature, key_id);
//  console.log('Signature and KeyId ---');
//  console.log(signature, key_id);
}

let queryParamsString = queryUrl;
if (queryParamsString.indexOf('?') > -1) {
  queryParamsString = queryUrl.split('?')[1];
}

if(debug) {
  console.debug('Query param string ---');
 // console.log('Query param string ---');
  console.debug(queryParamsString);
 // console.log(queryParamsString);
}

/**
 * As per admob, 
 * The last two query parameters of rewarded video SSV callbacks are always signature and key_id, in that order.
 * The remaining query parameters specify the content to be verified. 
 */
let contentToVerify = queryParamsString.substring(0, queryParamsString.indexOf('signature') -1);

if(debug) {
  console.debug('Content to verify ---');
 // console.log(contentToVerify);
 // console.log('Content to verify ---');
  console.debug(contentToVerify);
}

let keyMap = await getGoogleKeysMap();

if(keyMap[`${key_id}`]) {
  let publicKey = keyMap[`${key_id}`];
  const verifier = crypto.createVerify('RSA-SHA256');
  verifier.update(contentToVerify);
  let result = verifier.verify(publicKey, signature, 'base64');
  if (result) {
    console.debug('Result ---');
     console.debug(result);
    return true;
  } else {
    console.debug('Failure ---');
    console.debug(result);
    throw new Error('Invalid Signature Supplied');
  }
} else {
  console.debug('Key id provided doesn\'t exist ---');
  throw new Error('Key id provided doesn\'t exist in the google public keys');
}


  } catch (error) {

 }

}

module.exports.verify = verify;