Add https option to prependUrl util

packages/url/README.md

@@ -476,6 +476,7 @@ const actualURL = prependHTTP( 'wordpress.org' ); // http://wordpress.org
 _Parameters_
 
 -   _url_ `string`: The URL to test.
+-   _https_ `boolean`: whether or not to use secure https protocol.
 
 _Returns_
 

packages/url/src/prepend-http.js

@@ -8,23 +8,25 @@ const USABLE_HREF_REGEXP = /^(?:[a-z]+:|#|\?|\.|\/)/i;
 /**
  * Prepends "http://" to a url, if it looks like something that is meant to be a TLD.
  *
- * @param {string} url The URL to test.
+ * @param {string}  url   The URL to test.
  *
+ * @param {boolean} https whether or not to use secure https protocol.
  * @example
  * ```js
  * const actualURL = prependHTTP( 'wordpress.org' ); // http://wordpress.org
  * ```
  *
  * @return {string} The updated URL.
  */
-export function prependHTTP( url ) {
+export function prependHTTP( url, https = false ) {
 	if ( ! url ) {
 		return url;
 	}
 
 	url = url.trim();
 	if ( ! USABLE_HREF_REGEXP.test( url ) && ! isEmail( url ) ) {
-		return 'http://' + url;
+		const protocol = https ? 'https://' : 'http://';
+		return `${ protocol }${ url }`;
 	}
 
 	return url;

packages/url/src/test/index.js

@@ -888,6 +888,16 @@ describe( 'prependHTTP', () => {
 
 		expect( prependHTTP( url ) ).toBe( 'http://wordpress.org' );
 	} );
+
+	it( 'should use secure protocol when useHttps option is provided', () => {
+		const url = 'wordpress.org ';
+
+		expect(
+			prependHTTP( url, {
+				https: true,
+			} )
+		).toBe( 'https://wordpress.org' );
+	} );
 } );
 
 describe( 'safeDecodeURI', () => {