Azure API Management Policy(Rewrite URI policy)- Template and Query Parameters - azure

Question

I require some help on doing a rewrite uri policy. I was able to extract information from payload and change the initial request URL. Have extracted the insurer_id from body and passed it to my backend -> mybackend.com/api/relationship/deny/{insurer_id}
I was able to extract it and send it to my backend, I have a bit of a trouble formatting once the request has been posted
I have a current payload:
{
"insurer_id": "22112",
"insurer_name": "Steve Rogers",
"status_code: [ " "Deny\",",
],
"additionalComments": "This is a test"
}
This is my Current code:
<policies>
<inbound>
<base />
<set-variable name="insurerId" value="#{
var body = context.Request.Body.As<JObject>(true);
return body["insurer_id"].Value<string>();
}" />
<set-variable name="status_code" value="#{
return context.Request.Body.As<JObject>(preserveContent:true)["status_code"].ToString(Newtonsoft.Json.Formatting.None);
}" />
<rewrite-uri template="#("/api/relationship/deny/" + context.Variables.GetValueOrDefault<string>("insurerId") + "?denyReason=" + context.Variables.GetValueOrDefault<string>("status_code"))" copy-unmatched-params="false" />
<set-backend-service base-url="https://testbackend.azure-api.net" />
</inbound>
<backend>
<base />
</backend>
<outbound>
<base />
</outbound>
<on-error>
<base />
</on-error>
</policies>
What I am trying to achieve works, but when I do a post, the payload doesn't look what is to be expected.
Expected Payload:
{
"insurer_id": "22112",
"insurer_name": "Steve Rogers",
"status_code": "Deny",
"additionalComments": "This is a test"
}
Unformatted payload:
{
"insurer_id": "22112",
"insurer_name": "Steve Rogers",
"status_code": "[\"Deny\"]",
"additionalComments": "This is a test"
}

Answer 1

You have to read the first value of your JArray and assign it to the variable:
<set-variable name="status_code" value="#{
var body = context.Request.Body.As<JObject>(true);
var statusCode = body["status_code"] as JArray;
if(statusCode != null && statusCode.Count > 0)
{
return statusCode.FirstOrDefault();
}
return null;
}" />
But therefore you have to fix your invalid JSON:
{
"insurer_id": "22112",
"insurer_name": "Steve Rogers",
"status_code": [ "Deny"],
"additionalComments": "This is a test"
}
A query string consists of a key-value pair:
https://example.com/over/there?name=ferret
name is the key
ferret is the value for it
In your example, there's no key:
? + denyReason=context.Variables.GetValueOrDefault<string>("status_code")
and also the ? is a string. So it has to be put between quotation marks.
Fixed with sample query-key status_code:
<rewrite-uri template="#("/api/relationship/deny/" + context.Variables.GetValueOrDefault<string>("insurerId") + "?statuscode=" + context.Variables.GetValueOrDefault<string>("status_code"))" copy-unmatched-params="false" />
Complete policy:
<policies>
<inbound>
<base />
<set-variable name="insurerId" value="#{
var body = context.Request.Body.As<JObject>(true);
return body["insurer_id"].Value<string>();
}" />
<set-variable name="status_code" value="#{
var body = context.Request.Body.As<JObject>(true);
var statusCode = body["status_code"] as JArray;
if(statusCode != null && statusCode.Count > 0)
{
return statusCode.FirstOrDefault();
}
return null;
}" />
<rewrite-uri template="#("/api/relationship/deny/" + context.Variables.GetValueOrDefault<string>("insurerId") + "?statuscode=" + context.Variables.GetValueOrDefault<string>("status_code"))" copy-unmatched-params="false" />
<set-backend-service base-url="https://testbackend.azure-api.net" />
</inbound>
<backend>
<base />
</backend>
<outbound>
<base />
</outbound>
<on-error>
<base />
</on-error>
</policies>