From b590ed40aeea0facb2d66988bf12cc6b5022e5fa Mon Sep 17 00:00:00 2001
From: Bauke Scholtz <balusc@gmail.com>
Date: Sun, 9 Jul 2023 11:58:42 -0400
Subject: [PATCH] https://github.com/eclipse-ee4j/mojarra/issues/5272 Extract
 Faces spec version from manifest

---
 .../main/java/com/sun/faces/config/WebConfiguration.java  | 8 ++++++++
 .../java/com/sun/faces/context/ExternalContextImpl.java   | 8 +++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/impl/src/main/java/com/sun/faces/config/WebConfiguration.java b/impl/src/main/java/com/sun/faces/config/WebConfiguration.java
index 012bb5cd16..f66dd7d28a 100644
--- a/impl/src/main/java/com/sun/faces/config/WebConfiguration.java
+++ b/impl/src/main/java/com/sun/faces/config/WebConfiguration.java
@@ -114,6 +114,8 @@ public class WebConfiguration {
     private FaceletsConfiguration faceletsConfig;
 
     private boolean hasFlows;
+    
+    private String specificationVersion;
 
     // ------------------------------------------------------------ Constructors
 
@@ -134,6 +136,8 @@ private WebConfiguration(ServletContext servletContext) {
         getOptionValue(WebContextInitParameter.ResourceExcludes, " ");
         getOptionValue(WebContextInitParameter.FaceletsViewMappings, ";");
         getOptionValue(WebContextInitParameter.FaceletsSuffix, " ");
+        
+        specificationVersion = getClass().getPackage().getSpecificationVersion();
     }
 
     // ---------------------------------------------------------- Public Methods
@@ -200,6 +204,10 @@ public void setHasFlows(boolean hasFlows) {
         this.hasFlows = hasFlows;
     }
 
+    public String getSpecificationVersion() {
+        return specificationVersion;
+    }
+
     /**
      * Obtain the value of the specified boolean parameter
      *
diff --git a/impl/src/main/java/com/sun/faces/context/ExternalContextImpl.java b/impl/src/main/java/com/sun/faces/context/ExternalContextImpl.java
index bc5e77f3cb..13e505874b 100644
--- a/impl/src/main/java/com/sun/faces/context/ExternalContextImpl.java
+++ b/impl/src/main/java/com/sun/faces/context/ExternalContextImpl.java
@@ -43,6 +43,7 @@
 import java.util.logging.Logger;
 
 import com.sun.faces.RIConstants;
+import com.sun.faces.config.WebConfiguration;
 import com.sun.faces.context.flash.ELFlash;
 import com.sun.faces.renderkit.html_basic.ScriptRenderer;
 import com.sun.faces.renderkit.html_basic.StylesheetRenderer;
@@ -130,7 +131,12 @@ public ExternalContextImpl(ServletContext sc, ServletRequest request, ServletRes
 
         boolean enabled = ContextParamUtils.getValue(servletContext, SendPoweredByHeader, Boolean.class);
         if (enabled) {
-            ((HttpServletResponse) response).addHeader("X-Powered-By", "Faces/3.0");
+            String poweredBy = "Faces";
+            String specificationVersion = WebConfiguration.getInstance(sc).getSpecificationVersion();
+            if (specificationVersion != null) {
+                poweredBy += "/" + specificationVersion;
+            }
+            ((HttpServletResponse) response).addHeader("X-Powered-By", poweredBy);
         }
 
         distributable = ContextParamUtils.getValue(servletContext, ContextParam.EnableDistributable, Boolean.class);