Username password JWT with Salesforce Named Credentials

0 votes

I need to integrate with a service that uses an authentication flow I'm not familiar with and wondering can I use Named Credentials with it?

The flow requires that I first get a JWT token by passing a username & password in a JSON body. Then I can use that as a regular bearer token.

  1. Get token, which returns {"securityToken": "TOKEN"}
curl --request POST \
  --url https://SERVICE_URL/token \
  --header 'Content-Type: application/json' \
  --data '{
    "Username": "USERNAME",
    "Password": "PASSWORD"
}'
  1. Call secured endpoint
curl --request GET \
  --url https://SERVICE_URL/record \
  --header 'Authorization: Bearer TOKEN'

Is this a common authentication flow and, if so, is there a common name for it?

Can I Use Salesforce Named Credentials with this kind of flow or will I need to manually call out for the token?

Mar 2, 2022 in SalesForce by surbhi
• 3,820 points
2,109 views

1 answer to this question.

0 votes

Although Named Credentials cannot be used to manage this authentication flow, it can be used to obtain the token without needing to utilise Custom Settings to store the username and password.

Create a Named Credential that will only be used to obtain the token.

Property Value Notes
Label
SERVICE Token Request
Naming intends to specify that this is only for the token.
URL https://SERVICE_URL/token Again, very specific to just the token call.
Identity Type Named Principal This particular example uses the same username/password for all users.
Authentication Protocol
Password Authentication
 
Username USERNAME The username required for the token request.
Password PASSWORD The password required for the token request.
Generate Authorization Header false If enabled, Salesforce will generate an authorization header, but the external service does not want it. The external service expects the username and password as separate properties in JSON.
Allow Merge Fields in HTTP Body true Enabling this will allow usage of the username & password fields in apex.

Anonymous Apex

HttpRequest req = new HttpRequest();
req.setEndpoint('callout:SERVICE_Token_Request');
req.setMethod('POST');
req.setHeader('Content-Type', 'application/json');
req.setBody('{"Username":"{!HTMLENCODE($Credential.Username)}",' +
            '"Password":"{!HTMLENCODE($Credential.Password)}"}');


Http http = new Http();
HTTPResponse res = http.send(req);
Map<String, Object> response = (Map<String, Object>)JSON.deserializeUntyped(res.getBody());
String securityToken = (String)response.get('securityToken');
System.debug(securityToken); // TOKEN

Hope this helps!

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answered Mar 2, 2022 by surbhi
• 3,820 points

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