通过 Azure NotificationHub REST Api 从设备发送推送通知

Question

我正在尝试通过 Azure NotificationHub REST Api 从 iOS 设备 (iPhone) 发送推送通知。我正在按照我在网上找到的 Azure 文档从 Xamarin.iOS 解决方案中尝试此操作。

响应返回以下信息：

Error: '50002: Provider Internal Error' Status code: 500

用于调用 NotificationHub REST Api 的代码（来自 iOS 客户端应用程序）：

var hubUtil = new NotificationHubUtility("Endpoint=sb://company-name.servicebus.windows.net/;SharedAccessKeyName=DefaultFullSharedAccessSignature;SharedAccessKey=00000000000000011111111111111122222222222222");
hubUtil.SendNotificationMessage("This is a TEST Notification!").ConfigureAwait(false);

public class NotificationHubUtility
{
    public string Endpoint { get; private set; }
    public string SasKeyName { get; private set; }
    public string SasKeyValue { get; private set; }
    public string HubName { get; private set; }
    public string ApiVersion { get; private set; }

    public NotificationHubUtility(string connectionString)
    {
        //Parse Connectionstring
        string[] parts = connectionString.Split(new char[] {';'});
        for (int i = 0; i < parts.Length; i++)
        {
            if (parts[i].StartsWith("Endpoint", StringComparison.CurrentCulture))
                Endpoint = "https" + parts[i].Substring(11);
            if (parts[i].StartsWith("SharedAccessKeyName", StringComparison.CurrentCulture))
                SasKeyName = parts[i].Substring(20);
            if (parts[i].StartsWith("SharedAccessKey", StringComparison.CurrentCulture))
                SasKeyValue = parts[i].Substring(16);
        }

        HubName = "my-hub";
        ApiVersion = "?api-version=2014-09-01";
    }

    public string GetSaSToken(string uri, int minUntilExpire)
    {
        string targetUri = Uri.EscapeDataString(uri.ToLower()).ToLower();

        // Add an expiration in seconds to it.
        long expiresOnDate = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
        expiresOnDate += minUntilExpire * 60 * 1000;
        long expires_seconds = expiresOnDate / 1000;
        var toSign = targetUri + "\n" + expires_seconds;

        // Generate a HMAC-SHA256 hash or the uri and expiration using your secret key.
        IMacAlgorithmProvider hasher = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha256);
        var messageBuffer = WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(toSign, Encoding.UTF8);
        var keyBuffer = WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(SasKeyValue, Encoding.UTF8);
        var hmacKey = hasher.CreateKey(keyBuffer);
        var signedMessage = WinRTCrypto.CryptographicEngine.Sign(hmacKey, messageBuffer);

        string signature = Uri.EscapeDataString(WinRTCrypto.CryptographicBuffer.EncodeToBase64String(signedMessage));

        var token = "SharedAccessSignature sig=" + signature + "&se=" + expires_seconds + "&skn=" + SasKeyName + "&sr=" + targetUri;

        return token;
    }

    public async Task SendNotificationMessage(string message)
    {
        try
        {
            // basic http client (if needed)
            var httpClient = new HttpClient();
            httpClient.MaxResponseContentBufferSize = 1024000;

            var notificationPayload = "{\"aps\":{\"alert\":\"" + message + "\"}}";
            var notificationHubUrl = $"{Endpoint}{HubName}/messages/{ApiVersion}";
            var authToken = GetSaSToken(notificationHubUrl, 10);

            var request = new HttpRequestMessage(HttpMethod.Post, notificationHubUrl);
            //request.Headers.Add("Content-Type", "application/json;charset=utf-8");
            request.Headers.Add("ServiceBusNotification-Format", "apple");
            request.Headers.Add("ServiceBusNotification-Apns-Expiry", DateTime.UtcNow.AddYears(1).ToString("YYYY-MM-DDThh:mmTZD"));
            request.Headers.Add("Authorization", authToken);
            var requestBody = new StringContent(notificationPayload, Encoding.UTF8, "application/json");
            request.Content = requestBody;

            var response = await httpClient.SendAsync(request, HttpCompletionOption.ResponseContentRead);

        }
        catch (Exception ex)
        {
            Console.Error.WriteLine(@"ERROR - Sending Notification {0}", ex.Message);
        }
    }
}

连接字符串示例：

Endpoint=sb://company-name.servicebus.windows.net/;SharedAccessKeyName=DefaultFullSharedAccessSignature;SharedAccessKey=00000000000000011111111111111122222222222222

环境和假设：

• 使用 C# 的 Xamarin.iOS 解决方案
• 使用PCLCrypto库进行加密
• 我正在尝试重新创建在 Azure 示例 github 存储库中的 Example 中演示的解决方案，但使用 Xamarin.iOS
• 连接字符串直接取自 Azure 门户
• 生成SaS令牌的代码改编自Azure NotificationHub REST Api Documentation
• 通知中心工作，我能够通过中心 UI 发送测试推送通知，我看到它进入设备

我在这里缺少什么？我无法在线找到与此错误有关的很多相关文档。任何帮助将不胜感激。

使用修复更新：

对上面代码的以下 2 处更改为我解决了这个问题：

已更改

ApiVersion = "?api-version=2014-09-01";

到

ApiVersion = "?api-version=2016-07";

已更改

request.Headers.Add("ServiceBusNotification-Apns-Expiry", DateTime.UtcNow.AddYears(1).ToString("YYYY-MM-DDThh:mmTZD"));

到

request.Headers.Add("ServiceBusNotification-Apns-Expiry", DateTime.UtcNow.AddYears(1).ToString("yyyy-MM-ddTHH:mm:sszzz"));

Answer 1

Api 版本 2014-09-01 不正确。请使用 2016-07 作为 Api 版本，你应该很好。

谢谢

苏拉布

Answer 2

我已经解决了问题：

1. +1 给 Sohrab 指出 Api 版本，我将其更新为 ApiVersion = "?api-version=2016-07";
2. ServiceBusNotification-Apns-Expiry 标头值格式存在错误，日期未正确格式化为字符串。更正的格式字符串是这个ToString("yyyy-MM-ddTHH:mm:sszzz")