47 lines
1.8 KiB
C#
47 lines
1.8 KiB
C#
using System;
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using System.Collections.Generic;
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using UnityEngine.Purchasing;
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using System.Security.Cryptography;
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namespace UnityEngine.Purchasing.Security
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{
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internal class GooglePlayValidator
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{
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private RSAKey key;
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public GooglePlayValidator(byte[] rsaKey)
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{
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key = new RSAKey(rsaKey);
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}
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public GooglePlayReceipt Validate(string receipt, string signature)
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{
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var rawReceipt = System.Text.Encoding.UTF8.GetBytes(receipt); // "{\"orderId\":\"G...
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var rawSignature = System.Convert.FromBase64String(signature);
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if (!key.VerifySha1(rawReceipt, rawSignature))
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{
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throw new InvalidSignatureException();
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}
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var dic = (Dictionary<string, object>)MiniJson.JsonDecode(receipt);
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object orderID, packageName, productId, purchaseToken, purchaseTime, purchaseState;
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dic.TryGetValue("orderId", out orderID);
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dic.TryGetValue("packageName", out packageName);
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dic.TryGetValue("productId", out productId);
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dic.TryGetValue("purchaseToken", out purchaseToken);
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dic.TryGetValue("purchaseTime", out purchaseTime);
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dic.TryGetValue("purchaseState", out purchaseState);
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// Google specifies times in milliseconds since 1970.
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var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
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// NOTE: to safely handle null values for these fields, using Convert.ToDouble & ToInt32 in place of casts
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var time = epoch.AddMilliseconds(Convert.ToDouble(purchaseTime));
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var state = (GooglePurchaseState)Convert.ToInt32(purchaseState);
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return new GooglePlayReceipt((string)productId, (string)orderID, (string)packageName,
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(string)purchaseToken, time, state);
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}
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}
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}
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