[FIXED JENKINS-13640] Allow file parameters to be viewed as plain text.

changelog.html

@@ -60,6 +60,9 @@ Upcoming changes</a>
   <li class=bug>
     Fixed nested view not showing up with just read perm for View
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13429">issue 13429</a>)
+  <li class=rfe>
+    Allow file parameters to be viewed as plain text.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13640">issue 13640</a>)
   <li class=rfe>
     Improve the low disk space warning message.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13826">issue 13826</a>)

core/src/main/java/hudson/model/FileParameterValue.java

@@ -181,7 +181,14 @@ public class FileParameterValue extends ParameterValue {
             AbstractBuild build = (AbstractBuild)request.findAncestor(AbstractBuild.class).getObject();
             File fileParameter = getLocationUnderBuild(build);
             if (fileParameter.isFile()) {
-                response.serveFile(request, fileParameter.toURI().toURL());
+                InputStream data = new FileInputStream(fileParameter);
+                long lastModified = fileParameter.lastModified();
+                long contentLength = fileParameter.length();
+                if (request.hasParameter("view")) {
+                    response.serveFile(request, data, lastModified, contentLength, "plain.txt");
+                } else {
+                    response.serveFile(request, data, lastModified, contentLength, originalFileName);
+                }
             }
         }
     }

core/src/main/resources/hudson/model/FileParameterValue/value.jelly

@@ -31,7 +31,10 @@ THE SOFTWARE.
             <j:invokeStatic var="encodedName" className="hudson.Util" method="rawEncode">
                 <j:arg value="${it.name}" />
             </j:invokeStatic>
-            <a href="parameter/${encodedName}/${it.originalFileName}">${it.originalFileName}</a>
+            <j:set var="path" value="parameter/${encodedName}/${it.originalFileName}"/>
+            <a href="${path}">${it.originalFileName}</a>
+            <st:nbsp/>
+            <a href="${path}?view">${%view}</a>
         </j:if>
     </f:entry>
 </j:jelly>
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