Polishing.

Add author tags. Let VaultConfigLocation accept PropertyTransformer. Extract prefix computation into its own method. Tweak documentation wording.

See gh-488
Original pull request: gh-582.

docs/src/main/asciidoc/config-data.adoc

@@ -38,6 +38,22 @@ spring.config.import: vault://first/context/path, vault://other/path, vault://
 ----
 ====
 
+Property names within a Spring `Environment` must be unique to avoid shadowing.
+If you use the same secret names in different context paths and you want to expose these as individual properties you can distinguish them by adding a `prefix` query parameter to the location.
+
+.application.yml
+====
+[source,yaml]
+----
+spring.config.import: vault://my/path?prefix=foo., vault://my/other/path?prefix=bar.
+secret: ${foo.secret}
+other.secret: ${bar.secret}
+----
+
+NOTE: Prefixes are added as-is to all property names returned by Vault. If you want key names to be separated with a dot between the prefix and key name, make sure to add a trailing dot to the prefix.
+
+====
+
 [[vault.configdata.location.optional]]
 === Conditionally enable/disable Vault Configuration
 
@@ -50,18 +66,6 @@ Optional locations are skipped during application startup if Vault support was d
 
 NOTE: Vault context paths that cannot be found (HTTP Status 404) are skipped regardless of whether the config location is marked optional. <<vault.config.fail-fast>> allows failing on start if a Vault context path cannot be found because of HTTP Status 404.
 
-If you have the same secret names in different paths, you can distinguish them by using a prefix on the path.
-
-.application.yml
-====
-[source,yaml]
-----
-spring.config.import: vault://my/prefixed/path?prefix=prefix1, vault://my/other/path?prefix=prefix2
-secret: ${prefix1.secret}
-other.secret: ${prefix2.secret}
-----
-
-====
 
 [[vault.configdata.customization]]
 === Infrastructure Customization

spring-cloud-vault-config/src/main/java/org/springframework/cloud/vault/config/VaultConfigDataLocationResolver.java

@@ -77,6 +77,7 @@ import org.springframework.web.util.UriComponentsBuilder;
  * required later on by {@link VaultConfigDataLoader}.
  *
  * @author Mark Paluch
+ * @author Jeffrey van der Laan
  * @since 3.0
  * @see VaultConfigurer
  * @see BootstrapRegistry
@@ -118,17 +119,20 @@ public class VaultConfigDataLocationResolver implements ConfigDataLocationResolv
 			contextPath = contextPath.substring(1);
 		}
 
+		return Collections.singletonList(
+				new VaultConfigLocation(contextPath, getPropertyTransformer(contextPath), location.isOptional()));
+	}
+
+	private static PropertyTransformer getPropertyTransformer(String contextPath) {
+
 		UriComponents uriComponents = UriComponentsBuilder.fromUriString(contextPath).build();
 		String prefix = uriComponents.getQueryParams().getFirst("prefix");
-		String path = uriComponents.getPath();
-		if (StringUtils.hasLength(prefix) && StringUtils.hasLength(path)) {
-			PropertyTransformer keyPrefixPropertyTransformer = PropertyTransformers.propertyNamePrefix(prefix);
-			SecretBackendMetadata secretBackendMetadata = KeyValueSecretBackendMetadata.create(path, keyPrefixPropertyTransformer);
-			return Collections.singletonList(new VaultConfigLocation(secretBackendMetadata, location.isOptional()));
-		}
-		else {
-			return Collections.singletonList(new VaultConfigLocation(contextPath, location.isOptional()));
+
+		if (StringUtils.hasText(prefix) && StringUtils.hasText(uriComponents.getPath())) {
+			return PropertyTransformers.propertyNamePrefix(prefix);
 		}
+
+		return PropertyTransformers.noop();
 	}
 
 	private static void registerVaultProperties(ConfigDataLocationResolverContext context) {

spring-cloud-vault-config/src/main/java/org/springframework/cloud/vault/config/VaultConfigLocation.java

@@ -20,6 +20,8 @@ import org.springframework.boot.context.config.ConfigDataLocation;
 import org.springframework.boot.context.config.ConfigDataResource;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
+import org.springframework.vault.core.util.PropertyTransformer;
+import org.springframework.vault.core.util.PropertyTransformers;
 
 /**
  * Vault-specific implementation for a {@link ConfigDataLocation}. Consists of a
@@ -40,17 +42,38 @@ public class VaultConfigLocation extends ConfigDataResource {
 
 	private final boolean optional;
 
+	/**
+	 * Create a new {@link VaultConfigLocation} instance.
+	 * @param contextPath the context path
+	 * @param optional if the resource is optional
+	 */
 	public VaultConfigLocation(String contextPath, boolean optional) {
+		this(contextPath, PropertyTransformers.noop(), optional);
+	}
+
+	/**
+	 * Create a new {@link VaultConfigLocation} instance.
+	 * @param contextPath the context path
+	 * @param propertyTransformer the property transformer
+	 * @param optional if the resource is optional
+	 * @since 3.0.4
+	 */
+	public VaultConfigLocation(String contextPath, PropertyTransformer propertyTransformer, boolean optional) {
 
 		super(optional);
 
 		Assert.hasText(contextPath, "Location must not be empty");
 		validatePath(contextPath);
 
-		this.secretBackendMetadata = KeyValueSecretBackendMetadata.create(contextPath);
+		this.secretBackendMetadata = KeyValueSecretBackendMetadata.create(contextPath, propertyTransformer);
 		this.optional = optional;
 	}
 
+	/**
+	 * Create a new {@link VaultConfigLocation} instance.
+	 * @param secretBackendMetadata the backend descriptor.
+	 * @param optional if the resource is optional
+	 */
 	public VaultConfigLocation(SecretBackendMetadata secretBackendMetadata, boolean optional) {
 
 		Assert.notNull(secretBackendMetadata, "SecretBackendMetadata must not be null");

spring-cloud-vault-config/src/test/java/org/springframework/cloud/vault/config/VaultConfigDataLocationResolverUnitTests.java

@@ -16,25 +16,19 @@
 
 package org.springframework.cloud.vault.config;
 
-import java.util.Arrays;
-import java.util.List;
-
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
 import org.junit.Before;
 import org.junit.Test;
+
 import org.springframework.boot.DefaultBootstrapContext;
 import org.springframework.boot.context.config.ConfigDataLocation;
 import org.springframework.boot.context.config.ConfigDataLocationResolverContext;
 import org.springframework.boot.context.config.Profiles;
 import org.springframework.boot.context.properties.bind.Binder;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 import static org.mockito.Mockito.mock;
@@ -44,6 +38,7 @@ import static org.mockito.Mockito.when;
  * Unit tests for {@link VaultConfigDataLocationResolver}.
  *
  * @author Mark Paluch
+ * @author Jeffrey van der Laan
  */
 public class VaultConfigDataLocationResolverUnitTests {
 
@@ -106,10 +101,9 @@ public class VaultConfigDataLocationResolverUnitTests {
 		VaultConfigDataLocationResolver resolver = new VaultConfigDataLocationResolver();
 
 		List<VaultConfigLocation> locations = resolver.resolveProfileSpecific(this.contextMock,
-				ConfigDataLocation.of("vault://my/context/path?prefix=myPrefix"), this.profilesMock);
+				ConfigDataLocation.of("vault://my/context/path?prefix=myPrefix."), this.profilesMock);
 
 		assertThat(locations).hasSize(1);
-		assertThat(locations.get(0)).hasToString("VaultConfigLocation [path='my/context/path', optional=false]");
 		assertThat(locations.get(0).getSecretBackendMetadata().getPropertyTransformer()
 				.transformProperties(Collections.singletonMap("key", "value"))).containsEntry("myPrefix.key", "value");
 	}
@@ -123,7 +117,6 @@ public class VaultConfigDataLocationResolverUnitTests {
 				ConfigDataLocation.of("vault://my/context/path?prefix="), this.profilesMock);
 
 		assertThat(locations).hasSize(1);
-		assertThat(locations.get(0)).hasToString("VaultConfigLocation [path='my/context/path', optional=false]");
 		assertThat(locations.get(0).getSecretBackendMetadata().getPropertyTransformer()
 				.transformProperties(Collections.singletonMap("key", "value"))).containsEntry("key", "value");
 	}