#992 - Remove URI restriction in HAL-FORMS implementation.

Prior to this commit the HAL-FORMS implementation verified the URIs of the affordances to match the self link of the representation model. This prevents the implementation of the HAL-FORMS metadata lookup protocol as defined in the HAL-FORMS specification [0].

We removed the verification to allow alternate URIs to be used for the afforances.

[0] https://rwcbook.github.io/hal-forms/#_suggested_process_flow_for_hal_forms_documents

Author: odrotbohm

src/main/java/org/springframework/hateoas/mediatype/hal/forms/HalFormsSerializers.java

@@ -280,7 +280,6 @@ private static Map<String, HalFormsTemplate> findTemplates(RepresentationModel<?
 				.map(it -> it.getAffordanceModel(MediaTypes.HAL_FORMS_JSON)) //
 				.map(HalFormsAffordanceModel.class::cast) //
 				.filter(it -> !it.hasHttpMethod(HttpMethod.GET)) //
-				.peek(it -> validate(resource, it)) //
 				.forEach(it -> {
 
 					Class<?> type = it.getInputType().resolve(Object.class);
@@ -388,21 +387,4 @@ public String[] getCodes() {
 			return new String[] { qualifiedCode, localCode, globalCode };
 		}
 	}
-
-	/**
-	 * Verify that the resource's self link and the affordance's URI have the same relative path.
-	 *
-	 * @param resource
-	 * @param model
-	 */
-	private static void validate(RepresentationModel<?> resource, HalFormsAffordanceModel model) {
-
-		String affordanceUri = model.getURI();
-		String selfLinkUri = resource.getRequiredLink(IanaLinkRelations.SELF.value()).expand().getHref();
-
-		if (!affordanceUri.equals(selfLinkUri)) {
-			throw new IllegalStateException("Affordance's URI " + affordanceUri + " doesn't match self link " + selfLinkUri
-					+ " as expected in HAL-FORMS");
-		}
-	}
 }