Add component-neutral encode option in UriUtils

Issue: SPR-12750, SPR-12942

spring-web/src/main/java/org/springframework/web/util/HierarchicalUriComponents.java

@@ -61,7 +61,6 @@ final class HierarchicalUriComponents extends UriComponents {
 
 	private final boolean encoded;
 
-
 	/**
 	 * Package-private constructor. All arguments are optional, and can be {@code null}.
 	 * @param scheme the scheme
@@ -479,7 +478,7 @@ final class HierarchicalUriComponents extends UriComponents {
 	// inner types
 
 	/**
-	 * Enumeration used to identify the parts of a URI.
+	 * Enumeration used to identify the allowed characters per URI component.
 	 * <p>Contains methods to indicate whether a given character is valid in a specific URI component.
 	 * @see <a href="http://www.ietf.org/rfc/rfc3986.txt">RFC 3986</a>
 	 */
@@ -555,6 +554,12 @@ final class HierarchicalUriComponents extends UriComponents {
 			public boolean isAllowed(int c) {
 				return isPchar(c) || '/' == c || '?' == c;
 			}
+		},
+		URI {
+			@Override
+			public boolean isAllowed(int c) {
+				return isUnreserved(c);
+			}
 		};
 
 		/**
@@ -600,7 +605,7 @@ final class HierarchicalUriComponents extends UriComponents {
 		 * Indicates whether the given character is in the {@code reserved} set.
 		 * @see <a href="http://www.ietf.org/rfc/rfc3986.txt">RFC 3986, appendix A</a>
 		 */
-		protected boolean isReserved(char c) {
+		protected boolean isReserved(int c) {
 			return isGenericDelimiter(c) || isSubDelimiter(c);
 		}
 

spring-web/src/main/java/org/springframework/web/util/UriUtils.java

@@ -177,6 +177,20 @@ public abstract class UriUtils {
 		return HierarchicalUriComponents.encodeUriComponent(fragment, encoding, HierarchicalUriComponents.Type.FRAGMENT);
 	}
 
+	/**
+	 * Encode characters outside the unreserved character set as defined in
+	 * <a href="https://tools.ietf.org/html/rfc3986#section-2">RFC 3986 Section 2</a>.
+	 * <p>This can be used to ensure the given String will not contain any
+	 * characters with reserved URI meaning regardless of URI component.
+	 * @param source the string to be encoded
+	 * @param encoding the character encoding to encode to
+	 * @return the encoded string
+	 * @throws UnsupportedEncodingException when the given encoding parameter is not supported
+	 */
+	public static String encode(String source, String encoding) throws UnsupportedEncodingException {
+		HierarchicalUriComponents.Type type = HierarchicalUriComponents.Type.URI;
+		return HierarchicalUriComponents.encodeUriComponent(source, encoding, type);
+	}
 
 	// decoding