通过HTTP添加Azure Service Bus规则

Question

我正在改变我的代码从Azure Service Bus订阅接收消息的方式。

以前我使用的是SDK类，现在我正在改为http REST调用。

为了创建订阅规则并在此规则上设置过滤器，我总是收到http 400作为返回。

看来我创建身体的方式不正确：

            var rule = $"https://{serviceBusNamespace}.servicebus.windows.net/{topicPath}/subscriptions/{subscriptionName}/rules/{ruleName}";

            var content = new StringContent(@"<RuleDescription xmlns:i=""http://www.w3.org/2001/XMLSchema-instance"" xmlns=""http://schemas.microsoft.com/netservices/2010/10/servicebus/connect"">
             < Filter i: type = ""SqlFilter"" >
              < SqlExpression > type = 'REPLY' AND username = '[email protected]' </ SqlExpression >
             </ Filter >
            </ RuleDescription >
            ", Encoding.UTF8, "application/xml");

            var requestResponse = await _httpClient.PutAsync(rule, content, new System.Threading.CancellationToken());

我还设置了以下标题：

_httpClient.DefaultRequestHeaders.Add("Authorization", _token);
                _httpClient.DefaultRequestHeaders.Add("ContentType", "application/atom+xml");
                _httpClient.DefaultRequestHeaders.Add("Accept", "application/atom+xml");

关于什么缺失的任何想法？

Answer 1

根据错误信息，它意味着请求参数错误。我不熟悉提到的api，如果可能的话你可以分享链接。

但我建议你可以使用Rules - Create Or Update。我们很容易使用。有关服务总线api的更多信息，请参阅此document。

PUT https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ServiceBus/namespaces/{namespaceName}/topics/{topicName}/subscriptions/{subscriptionName}/rules/{ruleName}?api-version=2017-04-01

我也为它做了一个演示。

1）获取访问令牌

private static async Task<string> GetToken(string tenantId, string clientId, string secretKey)
        {
            var context = new AuthenticationContext("https://login.windows.net/" + tenantId);
            ClientCredential clientCredential = new ClientCredential(clientId, secretKey);
            var tokenResponse = await context.AcquireTokenAsync("https://management.azure.com/", clientCredential);
            var accessToken = tokenResponse.AccessToken;
            return accessToken;
        }

2）关于如何获取tenantId，clientId和密钥请参考这个tutorial。并且不要忘记为应用程序分配角色。

var tenantId = "tenantId";
var clientId = "clientId";
var secretkey = "sercret Key";
var subscriptionId = "subscription Id";
var resurceGroup = "resourceGroup";
var nameSpace = "servicebus namespace";
var topicName = "topicName";
var subscription = "service subscription name";
var ruleName = "rule name";
var token = GetToken(tenantId,clientId,secretkey).Result;
using (var httpClient = new HttpClient())
{
   httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
   httpClient.DefaultRequestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json"));
   var body = "{\"properties\": { \"filterType\": \"SqlFilter\"},\"sqlExpression\": { \"sqlExpression\": \"myproperty=test\"}}";
   HttpContent content = new StringContent(body);
   var url = $"https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resurceGroup}/providers/Microsoft.ServiceBus/namespaces/{nameSpace}/topics/{topicName}/subscriptions/{subscription}/rules/{ruleName}?api-version=2017-04-01";
   var response = httpClient.PutAsync(url, content).Result;
 }

测试结果

更新：

看来我创建身体的方式不正确：

是的，你是对的。根据你提到的API document，我们可以知道正文是xml格式。但是你的xml代码字符串不是xml格式，你可以在线使用xml验证器。 charater < / >和标签之间应该没有空格。例如< Filter i: type = ""SqlFilter"">应该是<Filter i: type = ""SqlFilter"">

但这是一个经典的休息api。

我们不再定期更新此内容。有关如何支持此产品，服务，技术或API的信息，请查看Microsoft产品生命周期。

我建议您可以使用Azure管理API，我们也可以使用api获取访问令牌。

public static string GenerateAccessToken(string resource, string tenantId, string clientId,string secretKey)
        {
            var url = $"https://login.microsoftonline.com/{tenantId}/oauth2/token";
            var body = $"grant_type=client_credentials&client_id={clientId}&client_secret={secretKey}&resource={resource}";
            HttpClient client = new HttpClient
            {
                BaseAddress = new Uri(url)
            };
            StringContent content = new StringContent(body);
            content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
            var result = client.PostAsync(url, content).Result;
            var json = JObject.Parse (result.Content.ReadAsStringAsync().Result);
            return json["access_token"].ToString();
        }

如果您仍想使用classic api，我也会做一个演示。请尝试使用以下代码。

1.获取sastoken代码

public static string GetSasToken(string resourceUri, string keyName, string key, TimeSpan ttl)
  {
         var expiry = GetExpiry(ttl);
         string stringToSign = HttpUtility.UrlEncode(resourceUri) + "\n" + expiry;
         HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key));
         var signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
         var sasToken = string.Format(CultureInfo.InvariantCulture, "SharedAccessSignature sr={0}&sig={1}&se={2}&skn={3}",
         HttpUtility.UrlEncode(resourceUri), HttpUtility.UrlEncode(signature), expiry, keyName);
         return sasToken;
 }

private static string GetExpiry(TimeSpan ttl)
{
  TimeSpan expirySinceEpoch = DateTime.UtcNow - new DateTime(1970, 1, 1) + ttl;
   return Convert.ToString((int)expirySinceEpoch.TotalSeconds);
 }

2.用c＃代码创建规则。

var serviceBusNamespace = "serviceBusNameSpace";
var topicPath = "topicPath";
var subscriptionName = "subscription name";
var ruleName = "testrule2"; // rule name
var sharedAccessKeyName = "xxxSharedAccessKey",
var key = "xxxxxxM2Xf8uTRcphtbY=";
var queueUrl = $"https://{serviceBusNamespace}.servicebus.windows.net/{topicPath}/subscriptions/{subscriptionName}/rules/{ruleName}";
var token = GetSasToken(queueUrl, sharedAccessKeyName,key ,TimeSpan.FromDays(1));
            var body = @"<entry xmlns=""http://www.w3.org/2005/Atom"">
   <content type =""application/xml"" >
   <RuleDescription xmlns:i=""http://www.w3.org/2001/XMLSchema-instance"" xmlns=""http://schemas.microsoft.com/netservices/2010/10/servicebus/connect"">
           <Filter i:type=""SqlFilter"">
               <SqlExpression> type = 'REPLY' AND username = '[email protected]' </SqlExpression>
             </Filter>
           </RuleDescription>
         </content>
       </entry>";
            var length = body.Length.ToString();
            var content = new StringContent(body, Encoding.UTF8, "application/xml");
            var _httpClient = new HttpClient();
            _httpClient.DefaultRequestHeaders.Add("Authorization", token);
            _httpClient.DefaultRequestHeaders.Add("ContentType", "application/atom+xml");
            _httpClient.DefaultRequestHeaders.Add("Accept", "application/atom+xml");
            content.Headers.Add("Content-Length", length);
            var requestResponse =  _httpClient.PutAsync(queueUrl, content, new System.Threading.CancellationToken()).Result;

测试结果：