Enhance lifecycle of temporary files used by partial PUT

Delete temporary file right after finishing request processing.
Simplify using createTempFile.

Author: rmaucher

java/org/apache/catalina/servlets/DefaultServlet.java

@@ -602,7 +602,7 @@ protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws Se
         }
 
         InputStream resourceInputStream = null;
-
+        File tempContentFile = null;
         try {
             // Append data specified in ranges to existing content for this
             // resource - create a temp. file on the local filesystem to
@@ -611,8 +611,8 @@ protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws Se
             if (range == IGNORE) {
                 resourceInputStream = req.getInputStream();
             } else {
-                File contentFile = executePartialPut(req, range, path);
-                resourceInputStream = new FileInputStream(contentFile);
+                tempContentFile = executePartialPut(req, range, path);
+                resourceInputStream = new FileInputStream(tempContentFile);
             }
 
             if (resources.write(path, resourceInputStream, true)) {
@@ -636,6 +636,9 @@ protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws Se
                     // Ignore
                 }
             }
+            if (tempContentFile != null) {
+                tempContentFile.delete();
+            }
         }
     }
 
@@ -658,13 +661,7 @@ protected File executePartialPut(HttpServletRequest req, ContentRange range, Str
         // resource - create a temp. file on the local filesystem to
         // perform this operation
         File tempDir = (File) getServletContext().getAttribute(ServletContext.TEMPDIR);
-        // Convert all '/' characters to '.' in resourcePath
-        String convertedResourcePath = path.replace('/', '.');
-        File contentFile = new File(tempDir, convertedResourcePath);
-        if (contentFile.createNewFile()) {
-            // Clean up contentFile when Tomcat is terminated
-            contentFile.deleteOnExit();
-        }
+        File contentFile = File.createTempFile("put-part-", null, tempDir);
 
         try (RandomAccessFile randAccessContentFile = new RandomAccessFile(contentFile, "rw")) {
 

webapps/docs/changelog.xml

@@ -204,6 +204,9 @@
         <code>IOException</code> occurs on a non-container thread during
         asynchronous processing. (markt)
       </fix>
+      <fix>
+        Enhance lifecycle of temporary files used by partial PUT. (remm)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Coyote">