Add ESP32 bootloader upgrade functionality with JSON API support

Co-authored-by: netmindz <442066+netmindz@users.noreply.github.com>

wled00/data/update.htm

@@ -29,6 +29,13 @@
 					if (data.arch == "esp8266") {
 						toggle('rev');
 					}
+					isESP32 = data.arch && data.arch.startsWith('esp32');
+					if (isESP32) {
+						gId('bootloader-section').style.display = 'block';
+						if (data.bootloaderSHA256) {
+							gId('bootloader-hash').innerText = 'Current bootloader SHA256: ' + data.bootloaderSHA256;
+						}
+					}
 				})
 				.catch(error => {
 					console.log('Could not fetch device info:', error);
@@ -37,6 +44,7 @@
 					document.querySelector('.release-name').textContent = 'Unknown';
 				});
 		}
+		function GetV() {/*injected values here*/}
 	</script>
 	<style>
 		@import url("style.css");
@@ -60,6 +68,16 @@
 		<button id="rev" type="button" onclick="cR()">Revert update</button><br>
 		<button type="button" onclick="B()">Back</button>
 	</form>
+	<div id="bootloader-section" style="display:none;">
+		<hr class="sml">
+		<h2>ESP32 Bootloader Update</h2>
+		<div id="bootloader-hash" class="sip" style="margin-bottom:8px;"></div>
+		<form method='POST' action='./updatebootloader' id='bootupd' enctype='multipart/form-data' onsubmit="toggle('bootupd')">
+			<b>Warning:</b> Only upload verified ESP32 bootloader files!<br>
+			<input type='file' name='update' required><br>
+			<button type="submit">Update Bootloader</button>
+		</form>
+	</div>
 	<div id="Noupd" class="hide"><b>Updating...</b><br>Please do not close or refresh the page :)</div>
 </body>
 </html>