Initial checkin of code

library.properties

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+# https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#source-code
+name=ESP32-OTA
+version=0.1.0
+author=Scott Baker <scott.baker@gmail.com>
+maintainer=Scott Baker <scott.baker@gmail.com>
+sentence=Easily add a OTA via web to an existing project
+paragraph=Easily add a OTA via web to an existing project
+category=Communication
+url=https://github.com/scottchiefbaker/ESP-WebOTA
+architectures=esp32
+includes=WebOTA.h

src/WebOTA.cpp

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+// Arduino build process info: https://github.com/arduino/Arduino/wiki/Build-Process
+
+const char *WEBOTA_VERSION = "0.1.0";
+
+#include <Arduino.h>
+#include <WiFi.h>
+#include <WiFiClient.h>
+#include <ESPmDNS.h>
+#include <Update.h>
+#include <WebServer.h>
+
+// Index page
+const char* indexPage = "<h1>ESP32 Index</h1>";
+
+// WebOTA Page
+String get_ota_html() {
+	String ota_html = "";
+
+	ota_html += "<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js\"></script>\n";
+	ota_html += "\n";
+	ota_html += "<h1>WebOTA Version: " + (String) WEBOTA_VERSION + "</h1>\n";
+	ota_html += "\n";
+	ota_html += "<form method=\"POST\" action=\"#\" enctype=\"multipart/form-data\" id=\"upload_form\">\n";
+	ota_html += "    <input type=\"file\" name=\"update\">\n";
+	ota_html += "    <input type=\"submit\" value=\"Update\">\n";
+	ota_html += "</form>\n";
+	ota_html += "\n";
+	ota_html += "<div id=\"prg_wrap\" style=\"border: 0px solid; width: 100%;\">\n";
+	ota_html += "   <div id=\"prg\" style=\"display: none; border: 1px solid #008aff; background: #002180; text-align: center; color: white;\"></div>\n";
+	ota_html += "</div>\n";
+	ota_html += "\n";
+	ota_html += "<script>\n";
+	ota_html += "$(\"form\").submit(function(e){\n";
+	ota_html += "    e.preventDefault();\n";
+	ota_html += "    var form = $(\"#upload_form\")[0];\n";
+	ota_html += "    var data = new FormData(form);\n";
+	ota_html += "\n";
+	ota_html += "    $.ajax({\n";
+	ota_html += "        url: \"/update\",\n";
+	ota_html += "        type: \"POST\",\n";
+	ota_html += "        data: data,\n";
+	ota_html += "        contentType: false,\n";
+	ota_html += "        processData:false,\n";
+	ota_html += "        xhr: function() {\n";
+	ota_html += "            var xhr = new window.XMLHttpRequest();\n";
+	ota_html += "            xhr.upload.addEventListener(\"progress\", function(evt) {\n";
+	ota_html += "                if (evt.lengthComputable) {\n";
+	ota_html += "                    var per = Math.round((evt.loaded / evt.total) * 100);\n";
+	ota_html += "                    $(\"#prg\").html(per + \"%\").css(\"width\", per + \"%\").show();\n";
+	ota_html += "                }\n";
+	ota_html += "            }, false);\n";
+	ota_html += "\n";
+	ota_html += "            return xhr;\n";
+	ota_html += "        },\n";
+	ota_html += "        success:function(d, s) {\n";
+	ota_html += "            console.log(\"success!\")\n";
+	ota_html += "        },\n";
+	ota_html += "        error: function (a, b, c) {}\n";
+	ota_html += "    });\n";
+	ota_html += "});\n";
+	ota_html += "</script>\n";
+
+	return ota_html;
+}
+
+String ip2string(IPAddress ip) {
+	String ret = String(ip[0]) + "." +  String(ip[1]) + "." + String(ip[2]) + "." + String(ip[3]);
+
+	return ret;
+}
+
+int init_mdns(const char *host) {
+	/*use mdns for host name resolution*/
+	if (!MDNS.begin(host)) { //http://esp32.local
+		Serial.println("Error setting up MDNS responder!");
+		while (1) {
+			delay(1000);
+		}
+	}
+
+	Serial.printf("mDNS started : %s\r\n", host);
+}
+
+int init_wifi(const char *ssid, const char *password, const char *mdns_hostname) {
+	// Connect to WiFi network
+	WiFi.begin(ssid, password);
+
+	Serial.println("");
+	Serial.print("Connecting to Wifi");
+
+	// Wait for connection
+	while (WiFi.status() != WL_CONNECTED) {
+		delay(500);
+		Serial.print(".");
+	}
+
+	Serial.println("");
+
+	Serial.printf("Connected to '%s'\r\n\r\n",ssid);
+
+	String ipaddr = ip2string(WiFi.localIP());
+	Serial.printf("IP address   : %s\r\n", ipaddr.c_str());
+
+	//String macAddr = mac2string(WiFi.macAddress());
+	Serial.printf("MAC address  : %s \r\n", WiFi.macAddress().c_str());
+
+	init_mdns(mdns_hostname);
+
+	Serial.printf("WebOTA url   : http://%s.local:%d/webota\r\n\r\n", mdns_hostname, 8080);
+}
+
+int init_web_ota(WebServer *server) {
+	// Login page
+	server->on("/", HTTP_GET, [server]() {
+		server->sendHeader("Connection", "close");
+		server->send(200, "text/html", indexPage);
+	});
+
+	// Upload firmware page
+	server->on("/webota", HTTP_GET, [server]() {
+		server->sendHeader("Connection", "close");
+		String ota_html = get_ota_html();
+		server->send(200, "text/html", ota_html.c_str());
+	});
+
+	// Handling uploading firmware file
+	server->on("/update", HTTP_POST, [server]() {
+		server->sendHeader("Connection", "close");
+		server->send(200, "text/plain", (Update.hasError()) ? "FAIL" : "OK");
+		ESP.restart();
+	}, [server]() {
+		HTTPUpload& upload = server->upload();
+		if (upload.status == UPLOAD_FILE_START) {
+			Serial.printf("Firmware update initiated: %s\r\n", upload.filename.c_str());
+			if (!Update.begin(UPDATE_SIZE_UNKNOWN)) { //start with max available size
+				Update.printError(Serial);
+			}
+		} else if (upload.status == UPLOAD_FILE_WRITE) {
+			/* flashing firmware to ESP*/
+			if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
+				Update.printError(Serial);
+			}
+		} else if (upload.status == UPLOAD_FILE_END) {
+			if (Update.end(true)) { //true to set the size to the current progress
+				Serial.printf("Firmware update successful: %u bytes\r\nRebooting...\r\n", upload.totalSize);
+			} else {
+				Update.printError(Serial);
+			}
+		}
+	});
+
+	server->begin();
+}

src/WebOTA.h

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+#include <WebServer.h>
+
+int init_wifi(const char *ssid, const char *password, const char *mdns_hostname);
+String ip2string(IPAddress ip);
+int init_mdns(const char *host);
+int init_web_ota(WebServer *server);