Polishing.

Introduce convenience methods for Policy and VaultEndpoint creation.

See gh-816

spring-vault-core/src/main/java/org/springframework/vault/client/VaultEndpoint.java

@@ -75,6 +75,18 @@ public class VaultEndpoint implements Serializable {
 		return vaultEndpoint;
 	}
 
+	/**
+	 * Create a {@link VaultEndpoint} given a {@link String URI}.
+	 * @param uri must contain hostname, port and scheme, must not be empty or
+	 * {@literal null}.
+	 * @return a new {@link VaultEndpoint}.
+	 * @see #from(URI)
+	 * @since 3.1
+	 */
+	public static VaultEndpoint from(String uri) {
+		return from(URI.create(uri));
+	}
+
 	/**
 	 * Create a {@link VaultEndpoint} given a {@link URI}.
 	 * @param uri must contain hostname, port and scheme, must not be empty or

spring-vault-core/src/main/java/org/springframework/vault/support/Policy.java

@@ -19,6 +19,7 @@ import java.io.IOException;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
@@ -59,9 +60,9 @@ import org.springframework.vault.support.Policy.PolicySerializer;
  * {@link Policy} support JSON serialization and deserialization using Jackson.
  *
  * @author Mark Paluch
- * @since 2.0
  * @see Rule
  * @see com.fasterxml.jackson.databind.ObjectMapper
+ * @since 2.0
  */
 @JsonSerialize(using = PolicySerializer.class)
 @JsonDeserialize(using = PolicyDeserializer.class)
@@ -356,7 +357,7 @@ public class Policy {
 			}
 
 			/**
-			 * Configure capabilities. apabilities are added when calling this method and
+			 * Configure capabilities. Capabilities are added when calling this method and
 			 * do not replace already configured capabilities.
 			 * @param capabilities must not be {@literal null}.
 			 * @return {@code this} {@link RuleBuilder}.
@@ -369,6 +370,25 @@ public class Policy {
 				return capabilities(Arrays.asList(capabilities));
 			}
 
+			/**
+			 * Configure capabilities. Capabilities are added when calling this method and
+			 * do not replace already configured capabilities.
+			 * @param capabilities must not be {@literal null}.
+			 * @return {@code this} {@link RuleBuilder}.
+			 * @since 3.1
+			 */
+			public RuleBuilder capabilities(Collection<? extends Capability> capabilities) {
+
+				Assert.notNull(capabilities, "Capabilities must not be null");
+				Assert.noNullElements(capabilities, "Capabilities must not contain null elements");
+
+				for (Capability capability : capabilities) {
+					this.capabilities.add(capability);
+				}
+
+				return this;
+			}
+
 			/**
 			 * Configure capabilities represented as {@link String} literals. This method
 			 * resolves capabilities using {@link BuiltinCapabilities}. Capabilities are
@@ -397,15 +417,6 @@ public class Policy {
 				return capabilities(mapped);
 			}
 
-			private RuleBuilder capabilities(Iterable<Capability> capabilities) {
-
-				for (Capability capability : capabilities) {
-					this.capabilities.add(capability);
-				}
-
-				return this;
-			}
-
 			/**
 			 * Configure a min TTL for response wrapping.
 			 * @param ttl must not be {@literal null}.
@@ -749,7 +760,9 @@ public class Policy {
 	static class StringToDurationConverter implements Converter<String, Duration> {
 
 		static Pattern SECONDS = Pattern.compile("(\\d+)s");
+
 		static Pattern MINUTES = Pattern.compile("(\\d+)m");
+
 		static Pattern HOURS = Pattern.compile("(\\d+)h");
 
 		@Override

spring-vault-core/src/test/java/org/springframework/vault/core/lease/TokenExpiryRotatingSecretsIntegrationTests.java

@@ -81,8 +81,7 @@ class TokenExpiryRotatingSecretsIntegrationTests extends IntegrationTestSupport
 
 		VaultOperations vaultOperations = prepare.getVaultOperations();
 
-		Policy policy = Policy
-			.of(Rule.builder().capabilities(BuiltinCapabilities.crud().toArray(new Capability[0])).path("/*").build());
+		Policy policy = Policy.of(Rule.builder().capabilities(BuiltinCapabilities.crud()).path("/*").build());
 		vaultOperations.opsForSys().createOrUpdatePolicy("TokenExpiryRotatingSecretsIntegrationTests", policy);
 
 		vaultOperations.write("auth/userpass/users/token-expiry", Map.of("password", "token-expiry", "token_ttl", 8,