ITブログ時々なんでもブログ

using System.Linq;
using System.Net.Http;
using Newtonsoft.Json.Linq;
・・・
public async Task CheckSubscriptionValidAsync()
{
    try
    {
        NSUrl nsURL = NSBundle.MainBundle.AppStoreReceiptUrl;
        NSData receipt = NSData.FromUrl(nsURL);
        string r = receipt?.GetBase64EncodedString(NSDataBase64EncodingOptions.None);
        bool isSandBox = false; //初回本番用レシート受信
        for (int i = 0; i <= 2; i++)
        {
            string result = await VerifyStoreReceiptAsync(r, isSandBox);
            if (!String.IsNullOrEmpty(result))
            {
                var jresult = JObject.Parse(result);
                if (jresult != null)
                {
                    long status = -1;
                    long.TryParse(jresult["status"].ToString(), out status);
                    if (status == 0)
                    {
                        //ここで定期購入の期限が取得できます。
                        var maxMs = (from rec in jresult["latest_receipt_info"]
                                     where (string)rec["product_id"] == this._productId
                                     select (double)rec["expires_date_ms"]).Max();
                        DateTime origin = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
                        var subscriptionExpirationDate = origin.AddMilliseconds(maxMs).ToLocalTime();
                        Console.WriteLine("CORRECT MAXIMUM EXPIRATION DATE = " + subscriptionExpirationDate);
                        return;
                    }
                    else if (status == 21007)
                        //status == 21007の場合、Snadbox環境へ接続
                        isSandBox = true;
                        continue;
                    }
                    //ここに他のステータスの場合の処理を記述します。
                }
                return;
            }
        }
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message + System.Environment.NewLine +
                                           ex.StackTrace);
    }
}
private async Task<string> VerifyStoreReceiptAsync(string receiptData, bool isSandBox)
{
    const string url1 = "https://buy.itunes.apple.com/verifyReceipt";
    const string url2 = "https://sandbox.itunes.apple.com/verifyReceipt";
    string url = url1;    //デフォルト本番環境に接続する。
    if (isSandBox)
    {
        url = url2;    //SandBox環境に接続する
    }
    var json = new JObject(new JProperty("receipt-data", receiptData),
                           new JProperty("password", "iTunesConnectSharedSecret")).ToString();
    using (var httpClient = new HttpClient())
    {
        HttpContent content = new StringContent(json);
        try
        {
            HttpResponseMessage response = await httpClient.PostAsync(url, content);
            return await response.Content.ReadAsStringAsync();
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine(ex.Message + System.Environment.NewLine +
                                               ex.StackTrace);
            return String.Empty;
        }
    }
}