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  1. Spring Framework
  2. SPR-15764

ExchangeFilterFunctions Explicit Model For Basic Authentication Credentials


    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Complete
    • Affects Version/s: None
    • Fix Version/s: 5.0 RC4
    • Component/s: Web:Client
    • Labels:
    • Last commented by a User:


      Currently ExchangeFilterFunctions provides a USERNAME_ATTRIBUTE and a PASSWORD_ATTRIBUTE and will populate the credentials in a Basic authentication header if the attributes are found.

      I think this will lead to issues if we provide other ways to authenticate. Consider a client that adds both basic authentication and digest authentication (if this is eventually supported). The user wants to specify to use basic authentication so the attributes are provided. However, digest authentication overrides the basic authentication header.

      Instead, it might be better to use a richer domain model for the attributes to ensure the users choice is clear.

      The domain model might even provide a way to add itself to read / write the model to the attributes. For example, something like this:

      public class BasicAuthenticationCredential implements Consumer<Map<String,Object>> {
      	private static String ATTRIBUTE_NAME = BasicAuthenticationCredential.class.getName().concat(".ATTRIBUTE_NAME");
      	private final String username;
      	private final String password;
      	BasicAuthenticationCredential(String username, String password) {
      		this.username = username;
      		this.password = password;
      	public String getUsername() {
      		return username;
      	public String getPassword() {
      		return password;
      	public void accept(Map<String, Object> attributes) {
      		attributes.put(ATTRIBUTE_NAME, this);
      	public static BasicAuthenticationCredential get(Map<String,Object> attributes) {
      		return (BasicAuthenticationCredential) attributes.get(ATTRIBUTE_NAME);

      Consumers would then be able to use:

      		// perhaps add static factory method for BasicAuthenticationCredential
      		.attributes(new BasicAuthenticationCredential("joe", "joe"))

      Comparing that vs:

      	.attribute(ExchangeFilterFunctions.USERNAME_ATTRIBUTE, "rob")
      	.attribute(ExchangeFilterFunctions.PASSWORD_ATTRIBUTE, "rob")

      Plus now we would be able to differentiate between the two credential types because we would add a DigestAuthenticationCredential if we supported it later on.




            • Assignee:
              arjen.poutsma Arjen Poutsma
              rwinch Rob Winch
              Last updater:
              St├ęphane Nicoll
            • Votes:
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              • Created:
                Days since last comment:
                1 year, 2 weeks, 6 days ago