[JENKINS-74832] disable copybutton in insecure context

Copying to clipboard only works in a secure context (https). So instead
of only showing that it doesn't work after pressing the button, the
button is now disabled and a corresponding tooltip is shown.

core/src/main/resources/lib/layout/copyButton.jelly

@@ -53,15 +53,17 @@ THE SOFTWARE.
   </st:documentation>
 
   <!-- 'copy-button' class is for backwards compatability -->
-  <button class="copy-button jenkins-button ${attrs.iconOnly == 'true' ? 'jenkins-button--tertiary' : ''} jenkins-copy-button ${attrs.clazz}"
+  <span data-message-insecure="${%Copying to clipboard requires a secure context.}">
+    <button class="copy-button jenkins-button ${attrs.iconOnly == 'true' ? 'jenkins-button--tertiary' : ''} jenkins-copy-button ${attrs.clazz}"
           text="${attrs.text}"
           ref="${attrs.ref}"
           message="${attrs.message ?: '%Copied'}"
           tooltip="${attrs.label != null ? null : attrs.tooltip ?: '%Copy'}"
           type="button">
-    <span class="jenkins-copy-button__icon" />
-    ${attrs.label}
-  </button>
+      <span class="jenkins-copy-button__icon" />
+      ${attrs.label}
+    </button>
+  </span>
 
   <st:adjunct includes="lib.layout.copyButton.copyButton"/>
 </j:jelly>

core/src/main/resources/lib/layout/copyButton/copyButton.js

@@ -3,8 +3,8 @@ Behaviour.specify(
   "copyButton",
   0,
   function (copyButton) {
-    copyButton.addEventListener("click", () => {
-      if (isSecureContext) {
+    if (isSecureContext) {
+      copyButton.addEventListener("click", () => {
         var text = copyButton.getAttribute("text");
         if (copyButton.hasAttribute("ref")) {
           var ref = copyButton.getAttribute("ref");
@@ -27,12 +27,11 @@ Behaviour.specify(
               copyButton,
             );
           });
-      } else {
-        hoverNotification(
-          "Copy is only supported with a secure (HTTPS) connection",
-          copyButton,
-        );
-      }
-    });
+      });
+    } else {
+      copyButton.disabled = true;
+      const parent = copyButton.parentElement;
+      parent.setAttribute("tooltip", parent.dataset.messageInsecure);
+    }
   },
 );