From 361fbbdb019bbacd33c4dbd5a31f643c94186c90 Mon Sep 17 00:00:00 2001
From: kkolinko <kkolinko@13f79535-47bb-0310-9956-ffa450edef68>
Date: Wed, 15 Jun 2011 13:51:03 +0000
Subject: [PATCH] Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50677
 Allow ANT style variables in the common.loader and other *.loader properties
 in conf/catalina.properties

I do not implement the substitution for any property as suggested by BZ 50677,
but only for the class loader ones. I think this is sufficient for the use case
and does not break backwards compatibility.
Most of the code is copied from ClassLoaderLogManager.replace().

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1136043 13f79535-47bb-0310-9956-ffa450edef68
---
 java/org/apache/catalina/startup/Bootstrap.java | 84 +++++++++++++++----------
 webapps/docs/changelog.xml                      |  5 ++
 2 files changed, 56 insertions(+), 33 deletions(-)

diff --git a/java/org/apache/catalina/startup/Bootstrap.java b/java/org/apache/catalina/startup/Bootstrap.java
index 6457dcef6..c7e477492 100644
--- a/java/org/apache/catalina/startup/Bootstrap.java
+++ b/java/org/apache/catalina/startup/Bootstrap.java
@@ -59,12 +59,6 @@ public final class Bootstrap {
 
     private static final Log log = LogFactory.getLog(Bootstrap.class);
 
-    // -------------------------------------------------------------- Constants
-
-
-    protected static final String CATALINA_HOME_TOKEN = "${" + Globals.CATALINA_HOME_PROP + "}";
-    protected static final String CATALINA_BASE_TOKEN = "${" + Globals.CATALINA_BASE_PROP + "}";
-
 
     // ------------------------------------------------------- Static Variables
 
@@ -116,38 +110,16 @@ public final class Bootstrap {
         if ((value == null) || (value.equals("")))
             return parent;
 
+        value = replace(value);
+
         List<Repository> repositories = new ArrayList<Repository>();
-        int i;
 
         StringTokenizer tokenizer = new StringTokenizer(value, ",");
         while (tokenizer.hasMoreElements()) {
-            String repository = tokenizer.nextToken();
-
-            // Local repository
-            boolean replace = false;
-            String before = repository;
-            while ((i=repository.indexOf(CATALINA_HOME_TOKEN))>=0) {
-                replace=true;
-                if (i>0) {
-                repository = repository.substring(0,i) + getCatalinaHome()
-                    + repository.substring(i+CATALINA_HOME_TOKEN.length());
-                } else {
-                    repository = getCatalinaHome()
-                        + repository.substring(CATALINA_HOME_TOKEN.length());
-                }
-            }
-            while ((i=repository.indexOf(CATALINA_BASE_TOKEN))>=0) {
-                replace=true;
-                if (i>0) {
-                repository = repository.substring(0,i) + getCatalinaBase()
-                    + repository.substring(i+CATALINA_BASE_TOKEN.length());
-                } else {
-                    repository = getCatalinaBase()
-                        + repository.substring(CATALINA_BASE_TOKEN.length());
-                }
+            String repository = tokenizer.nextToken().trim();
+            if (repository.length() == 0) {
+                continue;
             }
-            if (replace && log.isDebugEnabled())
-                log.debug("Expanded " + before + " to " + repository);
 
             // Check for a JAR URL repository
             try {
@@ -159,6 +131,7 @@ public final class Bootstrap {
                 // Ignore
             }
 
+            // Local repository
             if (repository.endsWith("*.jar")) {
                 repository = repository.substring
                     (0, repository.length() - "*.jar".length());
@@ -193,6 +166,51 @@ public final class Bootstrap {
 
     }
 
+    /**
+     * System property replacement in the given string.
+     * 
+     * @param str The original string
+     * @return the modified string
+     */
+    protected String replace(String str) {
+        // Implementation is copied from ClassLoaderLogManager.replace(),
+        // but added special processing for catalina.home and catalina.base.
+        String result = str;
+        int pos_start = str.indexOf("${");
+        if (pos_start >= 0) {
+            StringBuilder builder = new StringBuilder();
+            int pos_end = -1;
+            while (pos_start >= 0) {
+                builder.append(str, pos_end + 1, pos_start);
+                pos_end = str.indexOf('}', pos_start + 2);
+                if (pos_end < 0) {
+                    pos_end = pos_start - 1;
+                    break;
+                }
+                String propName = str.substring(pos_start + 2, pos_end);
+                String replacement;
+                if (propName.length() == 0) {
+                    replacement = null;
+                } else if (Globals.CATALINA_HOME_PROP.equals(propName)) {
+                    replacement = getCatalinaHome();
+                } else if (Globals.CATALINA_BASE_PROP.equals(propName)) {
+                    replacement = getCatalinaBase();
+                } else {
+                    replacement = System.getProperty(propName);
+                }
+                if (replacement != null) {
+                    builder.append(replacement);
+                } else {
+                    builder.append(str, pos_start, pos_end + 1);
+                }
+                pos_start = str.indexOf("${", pos_end + 1);
+            }
+            builder.append(str, pos_end + 1, str.length());
+            result = builder.toString();
+        }
+        return result;
+    }
+
 
     /**
      * Initialize daemon.
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 04a0f05fa..60e206827 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -45,6 +45,11 @@
 <section name="Tomcat 7.0.17 (markt)">
   <subsection name="Catalina">
     <changelog>
+      <add>
+        <bug>50677</bug>: Allow system property variables to be used in the
+        values of "common.loader" and other "*.loader" properties in the
+        <code>catalina.properties</code> file. (kkolinko)
+      </add>
       <fix>
         <bug>51376</bug>: When adding a Servlet via
         ServletContext#addServlet(String, Servlet), the Servlet was not
-- 
2.11.0