如何从 ARM 模板中检索 Azure Function App 的默认主机密钥？

您将能够在您的函数代码中使用函数宿主键，而且该函数会将您的函数键输出为 ARM 模板兼容字符串，因此您将能够在主 ARM 模板中引用它。

这里是函数代码，并适用于从 ARM 模板获取输入。

[FunctionName("GetKeys")]
public static async System.Threading.Tasks.Task<HttpResponseMessage> RunAsync([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequest req, TraceWriter log, ExecutionContext context)
{
  //get the publishing profile information from function argument
  var queryStrings=req.GetQueryParameterDictionary();
  string publishingUserName = "";
  string publishingPassword = "";  
  string hostKey = "";  
  queryStrings.TryGetValue("publishingUserName", out publishingUserName);
  queryStrings.TryGetValue("publishingPassword", out publishingPassword);
  //get the JWT token to call the KUDU Api
  var base64Auth = Convert.ToBase64String(Encoding.Default.GetBytes($"{publishingUserName}:{publishingPassword}"));
  var apiUrl = new Uri($"https://{Environment.GetEnvironmentVariable("WEBSITE_CONTENTSHARE")}.scm.azurewebsites.net/api");
  string JWT;
  using (var client = new HttpClient())
  {
    client.DefaultRequestHeaders.Add("Authorization", $"Basic {base64Auth}");
    var result = client.GetAsync($"{apiUrl}/functions/admin/token").Result;
    JWT = result.Content.ReadAsStringAsync().Result.Trim('"'); //get  JWT for call funtion key
  }
  //get the key from KUDU
  var siteUrl = new Uri($"https://{Environment.GetEnvironmentVariable("WEBSITE_CONTENTSHARE")}.azurewebsites.net");
  using (var client = new HttpClient())
  {
    client.DefaultRequestHeaders.Add("Authorization", "Bearer " + JWT);
    string jsonResult = client.GetAsync($"{siteUrl}/admin/host/keys").Result.Content.ReadAsStringAsync().Result;
    dynamic resObject = JsonConvert.DeserializeObject(jsonResult);
    hostKey = resObject.keys[0].value;
  }
  var template = @"{'$schema': 'https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#', 'contentVersion': '1.0.0.0', 'parameters': {}, 'variables': {}, 'resources': [],
   'outputs': {
      'HostKey':{
            'value': {hostKey},
            'type' : 'string'
          }
        }
}";
  HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
  response.Content = new StringContent(template, System.Text.Encoding.UTF8, "application/json");
  return response; 
}

更详细的代码可以参考这篇文章。