Validate vault location path.

Vault locations must not end with a trailing slash as that location points to a directory and not a valid secret.

Closes gh-601.

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

@@ -44,7 +44,8 @@ public class VaultConfigLocation extends ConfigDataResource {
 
 		super(optional);
 
-		Assert.hasText(contextPath, "Context path must not be empty");
+		Assert.hasText(contextPath, "Location must not be empty");
+		validatePath(contextPath);
 
 		this.secretBackendMetadata = KeyValueSecretBackendMetadata.create(contextPath);
 		this.optional = optional;
@@ -54,6 +55,7 @@ public class VaultConfigLocation extends ConfigDataResource {
 
 		Assert.notNull(secretBackendMetadata, "SecretBackendMetadata must not be null");
 
+		validatePath(secretBackendMetadata.getPath());
 		this.secretBackendMetadata = secretBackendMetadata;
 		this.optional = optional;
 	}
@@ -101,4 +103,9 @@ public class VaultConfigLocation extends ConfigDataResource {
 		return sb.toString();
 	}
 
+	private static void validatePath(String contextPath) {
+		Assert.isTrue(!contextPath.endsWith("/"),
+				() -> String.format("Location 'vault://%s' must not end with a trailing slash", contextPath));
+	}
+
 }

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

@@ -30,6 +30,7 @@ import org.springframework.cloud.vault.util.Settings;
 import org.springframework.context.ConfigurableApplicationContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
 /**
  * Integration tests for {@link VaultConfigDataLoader}.
@@ -62,6 +63,25 @@ public class VaultConfigDataLoaderIntegrationTests extends IntegrationTestSuppor
 		}
 	}
 
+	@Test
+	public void vaultLocationEndingWithSlashShouldFail() {
+
+		SpringApplication application = new SpringApplication(Config.class);
+		application.setWebApplicationType(WebApplicationType.NONE);
+		application.setAdditionalProfiles("cloud");
+
+		try (ConfigurableApplicationContext context = application.run("--spring.application.name=my-config-loader",
+				"--spring.config.import=vault://secret/my-config-loader/cloud/",
+				"--spring.cloud.vault.token=" + Settings.token().getToken())) {
+
+			fail("expected exception");
+		}
+		catch (IllegalArgumentException e) {
+			assertThat(e).hasMessageContaining(
+					"Location 'vault://secret/my-config-loader/cloud/' must not end with a trailing slash");
+		}
+	}
+
 	@Test
 	public void shouldConsiderDisabledVault() {
 

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

@@ -29,6 +29,7 @@ import org.springframework.boot.context.config.Profiles;
 import org.springframework.boot.context.properties.bind.Binder;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -67,6 +68,17 @@ public class VaultConfigDataLocationResolverUnitTests {
 						.hasSize(3);
 	}
 
+	@Test
+	public void shouldRejectLocationWithTrailingSlash() {
+
+		VaultConfigDataLocationResolver resolver = new VaultConfigDataLocationResolver();
+
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> resolver.resolveProfileSpecific(this.contextMock,
+						ConfigDataLocation.of("vault://foo/"), this.profilesMock))
+				.withMessage("Location 'vault://foo/' must not end with a trailing slash");
+	}
+
 	@Test
 	public void shouldDiscoverContextualLocations() {