improve the case when the path for a jar-file needs to be URL-decoded

it removes the case my.jar!/f%20o.rb which matches the behaviour of
file:f%20o.rb

Sponsored by Lookout Inc.

Author: mkristian

core/src/main/java/org/jruby/util/JarResource.java

@@ -19,20 +19,6 @@ public static JarResource create(String pathname) {
         Matcher matcher = PREFIX_MATCH.matcher(pathname);
         String sanitized = matcher.matches() ? matcher.group(1) : pathname;
 
-        try {
-            // since pathname is actually an uri we need to decode any url decoded characters like %20
-            // which happens when directory names contain spaces
-            // but do not to decode '+' to allow '+' inside a filenames
-            sanitized = sanitized.replace("+", "%2B");
-            sanitized = URLDecoder.decode(sanitized, "UTF-8");
-        } catch (IllegalArgumentException iae) {
-            // something in the path did not decode, so it's probably not a URI
-            // See jruby/jruby#2264.
-            return null;
-        } catch (UnsupportedEncodingException e) {
-            throw new RuntimeException( "hmm - system does not know UTF-8 string encoding :(" );
-        }
-
         int bang = sanitized.indexOf('!');
         String jarPath = sanitized.substring(0, bang);
         String entryPath = sanitized.substring(bang + 1);
@@ -54,7 +40,22 @@ private static JarResource createJarResource(String jarPath, String entryPath, b
 
         if (index == null) {
             // Jar doesn't exist
-            return null;
+            try {
+                jarPath = URLDecoder.decode(jarPath, "UTF-8");
+                entryPath = URLDecoder.decode(entryPath, "UTF-8");
+            } catch (IllegalArgumentException iae) {
+                // something in the path did not decode, so it's probably not a URI
+                // See jruby/jruby#2264.
+                return null;
+            } catch (UnsupportedEncodingException e) {
+                throw new RuntimeException( "hmm - system does not know UTF-8 string encoding :(" );
+            }
+            index = jarCache.getIndex(jarPath);
+
+            if (index == null) {
+                // Jar doesn't exist
+                return null;
+            }
         }
 
         // Try it as directory first, because jars tend to have foo/ entries

core/src/test/java/org/jruby/util/JarResourceTest.java

@@ -10,8 +10,6 @@ public void testCreateJarResource(){
         assertNotNull( resource );
         resource = JarResource.create( jar + "!/f o.rb" );
         assertNotNull( resource );
-        resource = JarResource.create( jar + "!/f%20o.rb" );
-        assertNotNull( resource );
         resource = JarResource.create( jar + "!/doesnotexist.rb" );
         assertNull( resource );
         resource = JarResource.create( jar.replace( ".jar", ".zip" ) + "!/foo.rb" );
@@ -24,8 +22,6 @@ public void testCreateJarResourceWithSpaceCharInPath(){
         assertNotNull( resource );
         resource = JarResource.create( jar + "!/f o.rb" );
         assertNotNull( resource );
-        resource = JarResource.create( jar + "!/f%20o.rb" );
-        assertNotNull( resource );
         resource = JarResource.create( jar + "!/doesnotexist.rb" );
         assertNull( resource );
         resource = JarResource.create( jar.replace( ".jar", ".zip" ) + "!/foo.rb" );