Restyle file uploads to fit in with modern forms UI

core/src/main/resources/hudson/PluginManager/advanced.jelly

@@ -61,7 +61,7 @@ THE SOFTWARE.
                             ${%deploytext}
                         </div>
                         <f:entry title="${%File}">
-                            <input type="file" name="name" class="jenkins-input" accept=".hpi,.jpi"/>
+                            <input type="file" name="name" class="jenkins-file-upload" accept=".hpi,.jpi"/>
                         </f:entry>
                         <p>${%Or}</p>
                         <f:entry title="${%URL}">

core/src/main/resources/hudson/model/FileParameterDefinition/index.jelly

@@ -30,7 +30,7 @@ THE SOFTWARE.
         <f:entry title="${h.escape(it.name)}" description="${it.formattedDescription}">
 		<div name="parameter">
 			<input type="hidden" name="name" value="${it.name}" />
-			<input name="file" type="file" jsonAware="true" />
+			<input name="file" type="file" jsonAware="true" class="jenkins-file-upload" />
 		</div>
 	</f:entry>
-</j:jelly>
+</j:jelly>

core/src/main/resources/jenkins/model/Jenkins/fingerprintCheck.jelly

@@ -40,7 +40,7 @@ THE SOFTWARE.
           </div>
         </f:block>
         <f:entry title="${%File to check}">
-          <input type="file" name="name" class="jenkins-input" />
+          <input type="file" name="name" class="jenkins-file-upload" />
         </f:entry>
         <f:block>
           <f:submit value="${%Check}" />

war/src/main/less/base/style.less

@@ -301,7 +301,7 @@ pre.console {
 }
 
 .setting-name,
-.setting-main > input,
+.setting-main > input:not([type="file"]),
 .setting-main > textarea {
   vertical-align: middle;
   margin-top: 0;

war/src/main/less/form/file-upload.less

@@ -0,0 +1,56 @@
+.jenkins-file-upload {
+  position: relative;
+  margin: -10px 0 0 -10px;
+  padding: 10px 0 10px 10px;
+  outline: none;
+  background: transparent;
+
+  &::before {
+    content: "";
+    position: absolute;
+    display: block;
+    left: calc(10px + 0.9rem);
+    width: 1rem;
+    height: 36px;
+    background: currentColor;
+    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M320 367.79h76c55 0 100-29.21 100-83.6s-53-81.47-96-83.6c-8.89-85.06-71-136.8-144-136.8-69 0-113.44 45.79-128 91.2-60 5.7-112 43.88-112 106.4s54 106.4 120 106.4h56' fill='none' stroke='currentColor' stroke-linecap='round' stroke-linejoin='round' stroke-width='40'/%3E%3Cpath fill='none' stroke='currentColor' stroke-linecap='round' stroke-linejoin='round' stroke-width='40' d='M320 255.79l-64-64-64 64M256 448.21V207.79'/%3E%3C/svg%3E");
+    mask-position: center;
+    mask-repeat: no-repeat;
+    pointer-events: none;
+  }
+
+  &::file-selector-button {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    border: none;
+    outline: none;
+    margin: 0;
+    padding: 0.5rem 0.85rem 0.5rem 2.5rem;
+    font-size: 0.8rem;
+    font-weight: 500;
+    color: var(--text-color);
+    border-radius: 0.66rem;
+    cursor: pointer;
+    min-height: 36px;
+    white-space: nowrap;
+    background: var(--button-background);
+    transition: var(--standard-transition);
+    box-shadow: 0 0 0 10px transparent;
+
+    &:hover {
+      background: var(--button-background--hover);
+    }
+
+    &:active {
+      background: var(--button-background--active);
+      box-shadow: 0 0 0 5px var(--button-box-shadow--focus);
+    }
+  }
+
+  &:focus-visible {
+    &::file-selector-button {
+      box-shadow: 0 0 0 0.2rem var(--text-color) !important;
+    }
+  }
+}

war/src/main/less/styles.less

@@ -9,6 +9,7 @@
 @import url("./base/yui-compatibility");
 @import url("./form/checkbox");
 @import url("./form/codemirror");
+@import url("./form/file-upload");
 @import url("./form/input");
 @import url("./form/layout");
 @import url("./form/radio");