From c318a10c14eba2eab616ab875a23722ef7655185 Mon Sep 17 00:00:00 2001
From: Paul Spooren <mail@aparcar.org>
Date: Sun, 24 Feb 2019 22:24:24 +0100
Subject: [PATCH] luci-app-attendedsysupgrade: refactor and format

* Reuse `request_dict` between requests.
* used vim Autoformat plugin to make the javascript code nice.
* add board_name as it eventually replaces board/model in requests

Signed-off-by: Paul Spooren <mail@aparcar.org>
---
 .../resources/attendedsysupgrade.js           | 680 +++++++++---------
 1 file changed, 358 insertions(+), 322 deletions(-)

diff --git a/applications/luci-app-attendedsysupgrade/root/www/luci-static/resources/attendedsysupgrade.js b/applications/luci-app-attendedsysupgrade/root/www/luci-static/resources/attendedsysupgrade.js
index e23414f70..a5fb0a1cb 100644
--- a/applications/luci-app-attendedsysupgrade/root/www/luci-static/resources/attendedsysupgrade.js
+++ b/applications/luci-app-attendedsysupgrade/root/www/luci-static/resources/attendedsysupgrade.js
@@ -1,382 +1,418 @@
-function $(s) { return document.getElementById(s.substring(1)); }
+function $(s) {
+    return document.getElementById(s.substring(1));
+}
 
-function show(s) { $(s).style.display = 'block'; }
+function show(s) {
+    $(s).style.display = 'block';
+}
 
-function hide(s) { $(s).style.display = 'none'; }
+function hide(s) {
+    $(s).style.display = 'none';
+}
 
 function set_server() {
-	hide("#status_box");
-	data.url = $("#server").value;
-	ubus_call("uci", "set", { "config": "attendedsysupgrade", "section": "server", values: { "url": data.url } })
-	ubus_call("uci", "commit", { "config": "attendedsysupgrade" })
-	var server_button = $("#server")
-	server_button.type = 'button';
-	server_button.className = 'cbi-button cbi-button-edit';
-	server_button.parentElement.removeChild($("#button_set"));
-	server_button.onclick = edit_server;
+    hide("#status_box");
+    data.url = $("#server").value;
+    ubus_call("uci", "set", {
+        "config": "attendedsysupgrade",
+        "section": "server",
+        values: {
+            "url": data.url
+        }
+    })
+    ubus_call("uci", "commit", {
+        "config": "attendedsysupgrade"
+    })
+    var server_button = $("#server")
+    server_button.type = 'button';
+    server_button.className = 'cbi-button cbi-button-edit';
+    server_button.parentElement.removeChild($("#button_set"));
+    server_button.onclick = edit_server;
 }
 
 function edit_server() {
-	$("#server").type = 'text';
-	$("#server").onkeydown = function(event) {
-		if(event.key === 'Enter') {
-			set_server();
-			return false;
-		}
-	}
-	$("#server").className = '';
-	$("#server").onclick = null;
-
-	var button_set = document.createElement("input");
-	button_set.type = "button";
-	button_set.value = "Save";
-	button_set.name = "button_set";
-	button_set.id = "button_set";
-	button_set.className = 'cbi-button cbi-button-save';
-	button_set.onclick = set_server
-	$("#server").parentElement.appendChild(button_set);
+    $("#server").type = 'text';
+    $("#server").onkeydown = function(event) {
+        if (event.key === 'Enter') {
+            set_server();
+            return false;
+        }
+    }
+    $("#server").className = '';
+    $("#server").onclick = null;
+
+    var button_set = document.createElement("input");
+    button_set.type = "button";
+    button_set.value = "Save";
+    button_set.name = "button_set";
+    button_set.id = "button_set";
+    button_set.className = 'cbi-button cbi-button-save';
+    button_set.onclick = set_server
+    $("#server").parentElement.appendChild(button_set);
 }
 
 function edit_packages() {
-	data.edit_packages = true
-	hide("#edit_button");
-	$("#edit_packages").value = data.packages.join("\n");
-	show("#edit_packages");
+    data.edit_packages = true
+    hide("#edit_button");
+    $("#edit_packages").value = data.packages.join("\n");
+    show("#edit_packages");
 }
 
 // requests to the upgrade server
-function server_request(request_dict, path, callback) {
-	request_dict.distro = data.release.distribution;
-	request_dict.target = data.release.target;
-	var request = new XMLHttpRequest();
-	request.open("POST", data.url + "/" + path, true);
-	request.setRequestHeader("Content-type", "application/json");
-	request.send(JSON.stringify(request_dict));
-	request.onerror = function(e) {
-		set_status("danger", "upgrade server down")
-		show("#server_div");
-	}
-	request.addEventListener('load', function(event) {
-		callback(request)
-	});
+function server_request(path, callback) {
+    var request = new XMLHttpRequest();
+    request.open("POST", data.url + "/" + path, true);
+    request.setRequestHeader("Content-type", "application/json");
+    request.send(JSON.stringify(request_dict));
+    request.onerror = function(e) {
+        set_status("danger", "upgrade server down")
+        show("#server_div");
+    }
+    request.addEventListener('load', function(event) {
+        callback(request)
+    });
 }
 
 // initial setup, get system information
 function setup() {
-	ubus_call("rpc-sys", "packagelist", {}, "packages");
-	ubus_call("system", "board", {}, "release");
-	ubus_call("system", "board", {}, "board_name");
-	ubus_call("system", "board", {}, "model");
-	ubus_call("system", "info", {}, "memory");
-	uci_get({ "config": "attendedsysupgrade", "section": "server", "option": "url" })
-	uci_get({ "config": "attendedsysupgrade", "section": "client", "option": "upgrade_packages" })
-	uci_get({ "config": "attendedsysupgrade", "section": "client", "option": "advanced_mode" })
-	uci_get({ "config": "attendedsysupgrade", "section": "client", "option": "auto_search" })
-	setup_ready();
+    ubus_call("rpc-sys", "packagelist", {}, "packages");
+    ubus_call("system", "board", {}, "release");
+    ubus_call("system", "board", {}, "board_name");
+    ubus_call("system", "board", {}, "model");
+    ubus_call("system", "info", {}, "memory");
+    uci_get({
+        "config": "attendedsysupgrade",
+        "section": "server",
+        "option": "url"
+    })
+    uci_get({
+        "config": "attendedsysupgrade",
+        "section": "client",
+        "option": "upgrade_packages"
+    })
+    uci_get({
+        "config": "attendedsysupgrade",
+        "section": "client",
+        "option": "advanced_mode"
+    })
+    uci_get({
+        "config": "attendedsysupgrade",
+        "section": "client",
+        "option": "auto_search"
+    })
+    setup_ready();
 }
 
 function setup_ready() {
-	// checks if a async ubus calls have finished
-	if(ubus_counter != ubus_closed) {
-		setTimeout(setup_ready, 300)
-	} else {
-		if(data.auto_search == 1) {
-			upgrade_check();
-		} else {
-			show("#upgrade_button");
-			show("#server_div");
-			$("#server").value = data.url;
-		}
-	}
+    // checks if a async ubus calls have finished
+    if (ubus_counter != ubus_closed) {
+        setTimeout(setup_ready, 300)
+    } else {
+        if (data.auto_search == 1) {
+            upgrade_check();
+        } else {
+            show("#upgrade_button");
+            show("#server_div");
+            $("#server").value = data.url;
+        }
+    }
 }
 
 function uci_get(option) {
-	// simple wrapper to get a uci value store in data.<option>
-	ubus_call("uci", "get", option, option["option"])
+    // simple wrapper to get a uci value store in data.<option>
+    ubus_call("uci", "get", option, option["option"])
 }
 
 ubus_counter = 0;
 ubus_closed = 0;
+
 function ubus_call(command, argument, params, variable) {
-	var request_data = {};
-	request_data.jsonrpc = "2.0";
-	request_data.id = ubus_counter;
-	request_data.method = "call";
-	request_data.params = [ data.ubus_rpc_session, command, argument, params ]
-	var request_json = JSON.stringify(request_data)
-	ubus_counter++;
-	var request = new XMLHttpRequest();
-	request.open("POST", ubus_url, true);
-	request.setRequestHeader("Content-type", "application/json");
-	request.onload = function(event) {
-		if(request.status === 200) {
-			var response = JSON.parse(request.responseText)
-			if(!("error" in response) && "result" in response) {
-				if(response.result.length === 2) {
-					if(command === "uci") {
-						data[variable] = response.result[1].value
-					} else {
-						data[variable] = response.result[1][variable]
-					}
-				}
-			} else {
-				set_status("danger", "<b>Ubus call failed:</b><br />Request: " + request_json + "<br />Response: " + JSON.stringify(response))
-			}
-			ubus_closed++;
-		}
-	}
-	request.send(request_json);
+    var request_data = {};
+    request_data.jsonrpc = "2.0";
+    request_data.id = ubus_counter;
+    request_data.method = "call";
+    request_data.params = [data.ubus_rpc_session, command, argument, params]
+    var request_json = JSON.stringify(request_data)
+    ubus_counter++;
+    var request = new XMLHttpRequest();
+    request.open("POST", ubus_url, true);
+    request.setRequestHeader("Content-type", "application/json");
+    request.onload = function(event) {
+        if (request.status === 200) {
+            var response = JSON.parse(request.responseText)
+            if (!("error" in response) && "result" in response) {
+                if (response.result.length === 2) {
+                    if (command === "uci") {
+                        data[variable] = response.result[1].value
+                    } else {
+                        data[variable] = response.result[1][variable]
+                    }
+                }
+            } else {
+                set_status("danger", "<b>Ubus call failed:</b><br />Request: " + request_json + "<br />Response: " + JSON.stringify(response))
+            }
+            ubus_closed++;
+        }
+    }
+    request.send(request_json);
 }
 
 function set_status(type, message, loading) {
-	$("#status_box").className = "alert-message " + type;
-	var loading_image = '';
-	if(loading) {
-		loading_image = '<img src="/luci-static/resources/icons/loading.gif" alt="Loading" style="vertical-align:middle"> ';
-	}
-	$("#status_box").innerHTML = loading_image + message;
-	show("#status_box")
+    $("#status_box").className = "alert-message " + type;
+    var loading_image = '';
+    if (loading) {
+        loading_image = '<img src="/luci-static/resources/icons/loading.gif" alt="Loading" style="vertical-align:middle"> ';
+    }
+    $("#status_box").innerHTML = loading_image + message;
+    show("#status_box")
 }
 
 function upgrade_check() {
-	// Asks server for new firmware
-	// If data.upgrade_packages is set to true search for new package versions as well
-	hide("#status_box");
-	hide("#server_div");
-	set_status("info", "Searching for upgrades", true);
-	var request_dict = {}
-	request_dict.version = data.release.version;
-	request_dict.revision = data.release.revision;
-	request_dict.installed = data.packages;
-	request_dict.upgrade_packages = data.upgrade_packages
-	server_request(request_dict, "api/upgrade-check", upgrade_check_callback)
+    // Asks server for new firmware
+    // If data.upgrade_packages is set to true search for new package versions as well
+    hide("#status_box");
+    hide("#server_div");
+    set_status("info", "Searching for upgrades", true);
+    request_dict.distro = data.release.distribution;
+    request_dict.version = data.release.version;
+    request_dict.target = data.release.target;
+    request_dict.revision = data.release.revision;
+    request_dict.installed = data.packages;
+    request_dict.upgrade_packages = data.upgrade_packages
+    server_request("api/upgrade-check", upgrade_check_callback)
 }
 
 function upgrade_check_callback(request_text) {
-	var request_json = JSON.parse(request_text)
-
-	// create simple output to tell user what's going to be upgrade (release/packages)
-	var info_output = ""
-	if(request_json.version != undefined) {
-		info_output += "<h3>New firmware release available</h3>"
-		info_output += data.release.version + " to " + request_json.version
-		data.latest_version = request_json.version;
-	}
-	if(request_json.upgrades != undefined) {
-		info_output += "<h3>Package upgrades available</h3>"
-		for (var upgrade in request_json.upgrades) {
-			info_output += "<b>" + upgrade + "</b>: " + request_json.upgrades[upgrade][1] + " to " + request_json.upgrades[upgrade][0] + "<br />"
-		}
-	}
-	data.packages = request_json.packages
-	set_status("success", info_output)
-
-	if(data.advanced_mode == 1) {
-		show("#edit_button");
-	}
-	var upgrade_button = $("#upgrade_button")
-	upgrade_button.value = "Request firmware";
-	upgrade_button.style.display = "block";
-	upgrade_button.disabled = false;
-	upgrade_button.onclick = upgrade_request;
-
+    var request_json = JSON.parse(request_text)
+
+    // create simple output to tell user what's going to be upgrade (release/packages)
+    var info_output = ""
+    if (request_json.version) {
+        info_output += "<h3>New release <b>" + request_json.version + "</b> available</h3>"
+        info_output += "Installed version: " + data.release.version
+        request_dict.version = request_json.version;
+    }
+    if (request_json.upgrades) {
+        if (request_json.upgrades != {}) {
+            info_output += "<h3>Package upgrades available</h3>"
+            for (var upgrade in request_json.upgrades) {
+                info_output += "<b>" + upgrade + "</b>: " + request_json.upgrades[upgrade][1] + " to " + request_json.upgrades[upgrade][0] + "<br />"
+            }
+        }
+    }
+    data.packages = request_json.packages
+    set_status("success", info_output)
+
+    if (data.advanced_mode == 1) {
+        show("#edit_button");
+    }
+    var upgrade_button = $("#upgrade_button")
+    upgrade_button.value = "Request firmware";
+    upgrade_button.style.display = "block";
+    upgrade_button.disabled = false;
+    upgrade_button.onclick = upgrade_request;
 }
 
 function upgrade_request() {
-	// Request the image
-	// Needed values
-	// version/release
-	// board_name or model (server tries to find the correct profile)
-	// packages
-	// The rest is added by server_request()
-	$("#upgrade_button").disabled = true;
-	hide("#edit_packages");
-	hide("#edit_button");
-	hide("#keep_container");
-
-	var request_dict = {}
-	request_dict.version = data.latest_version;
-	request_dict.board = data.board_name
-	request_dict.model = data.model
-
-	if(data.edit_packages == true) {
-		request_dict.packages = $("#edit_packages").value.split("\n")
-	} else {
-		request_dict.packages = data.packages;
-	}
-
-	server_request(request_dict, "api/upgrade-request", upgrade_request_callback)
+    // Request firmware using the following parameters
+    // distro, version, target, board_name/model, packages
+    $("#upgrade_button").disabled = true;
+    hide("#edit_packages");
+    hide("#edit_button");
+    hide("#keep_container");
+
+    // remove "installed" entry as unused by build requests
+    delete request_dict.installed
+    // add board info to let server determine profile
+    request_dict.board_name = data.board_name
+    request_dict.board = data.board_name
+    request_dict.model = data.model
+
+    if (data.edit_packages == true) {
+        request_dict.packages = $("#edit_packages").value.split("\n")
+    } else {
+        request_dict.packages = data.packages;
+    }
+    server_request("api/upgrade-request", upgrade_request_callback)
 }
 
 function upgrade_request_callback(request) {
-	// ready to download
-	var request_json = JSON.parse(request);
-	data.files = request_json.files;
-	data.sysupgrade = request_json.sysupgrade;
-
-	var info_output = 'Firmware created: <a href="' + data.url + data.files + data.sysupgrade + '"><b>' + data.sysupgrade+ '</b></a>'
-	info_output += ' <a target="_blank" href="'  + data.url + request_json.log + '">Build log</a>'
-	set_status("info", info_output);
-
-	show("#keep_container");
-	var upgrade_button = $("#upgrade_button")
-	upgrade_button.disabled = false;
-	upgrade_button.style.display = "block";
-	upgrade_button.value = "Flash firmware";
-	upgrade_button.onclick = download_image;
+    // ready to download
+    var request_json = JSON.parse(request);
+    data.files = request_json.files;
+    data.sysupgrade = request_json.sysupgrade;
+
+    var info_output = 'Firmware created: <a href="' + data.url + data.files + data.sysupgrade + '"><b>' + data.sysupgrade + '</b></a>'
+    info_output += ' <a target="_blank" href="' + data.url + request_json.log + '">Build log</a>'
+    set_status("info", info_output);
+
+    show("#keep_container");
+    var upgrade_button = $("#upgrade_button")
+    upgrade_button.disabled = false;
+    upgrade_button.style.display = "block";
+    upgrade_button.value = "Flash firmware";
+    upgrade_button.onclick = download_image;
 }
 
 function flash_image() {
-	// Flash image via rpc-sys upgrade_start
-	set_status("warning", "Flashing firmware. Don't unpower device", true)
-	ubus_call("rpc-sys", "upgrade_start", { "keep": $("#keep").checked }, 'message');
-	ping_max = 3600; // in seconds
-	setTimeout(ping_ubus, 10000)
+    // Flash image via rpc-sys upgrade_start
+    set_status("warning", "Flashing firmware. Don't unpower device", true)
+    ubus_call("rpc-sys", "upgrade_start", {
+        "keep": $("#keep").checked
+    }, 'message');
+    ping_max = 3600; // in seconds
+    setTimeout(ping_ubus, 10000)
 }
 
 function ping_ubus() {
-	// Tries to connect to ubus. If the connection fails the device is likely still rebooting.
-	// If more time than ping_max passes update may failed
-	if(ping_max > 0) {
-		ping_max--;
-		var request = new XMLHttpRequest();
-		request.open("GET", ubus_url, true);
-		request.addEventListener('error', function(event) {
-			set_status("warning", "Rebooting device - please wait!", true);
-			setTimeout(ping_ubus, 5000)
-		});
-		request.addEventListener('load', function(event) {
-			set_status("success", "Success! Please reload web interface");
-			$("#upgrade_button").value = "Reload page";
-			show("#upgrade_button");
-			$("#upgrade_button").disabled = false;
-			$("#upgrade_button").onclick = function() { location.reload(); }
-		});
-		request.send();
-	} else {
-		set_status("danger", "Web interface could not reconnect to your device. Please reload web interface or check device manually")
-	}
+    // Tries to connect to ubus. If the connection fails the device is likely still rebooting.
+    // If more time than ping_max passes update may failed
+    if (ping_max > 0) {
+        ping_max--;
+        var request = new XMLHttpRequest();
+        request.open("GET", ubus_url, true);
+        request.addEventListener('error', function(event) {
+            set_status("warning", "Rebooting device - please wait!", true);
+            setTimeout(ping_ubus, 5000)
+        });
+        request.addEventListener('load', function(event) {
+            set_status("success", "Success! Please reload web interface");
+            $("#upgrade_button").value = "Reload page";
+            show("#upgrade_button");
+            $("#upgrade_button").disabled = false;
+            $("#upgrade_button").onclick = function() {
+                location.reload();
+            }
+        });
+        request.send();
+    } else {
+        set_status("danger", "Web interface could not reconnect to your device. Please reload web interface or check device manually")
+    }
 }
 
 function upload_image(blob) {
-	// Uploads received blob data to the server using cgi-io
-	set_status("info", "Uploading firmware to device", true);
-	var request = new XMLHttpRequest();
-	var form_data  = new FormData();
-
-	form_data.append("sessionid", data.ubus_rpc_session)
-	form_data.append("filename", "/tmp/firmware.bin")
-	form_data.append("filemode", 755) // insecure?
-	form_data.append("filedata", blob)
-
-	request.addEventListener('load', function(event) {
-		request_json = JSON.parse(request.responseText)
-		flash_image();
-	});
-
-	request.addEventListener('error', function(event) {
-		set_status("danger", "Upload of firmware failed, please retry by reloading web interface")
-	});
-
-	request.open('POST', origin + '/cgi-bin/cgi-upload');
-	request.send(form_data);
+    // Uploads received blob data to the server using cgi-io
+    set_status("info", "Uploading firmware to device", true);
+    var request = new XMLHttpRequest();
+    var form_data = new FormData();
+
+    form_data.append("sessionid", data.ubus_rpc_session)
+    form_data.append("filename", "/tmp/firmware.bin")
+    form_data.append("filemode", 755) // insecure?
+    form_data.append("filedata", blob)
+
+    request.addEventListener('load', function(event) {
+        request_json = JSON.parse(request.responseText)
+        flash_image();
+    });
+
+    request.addEventListener('error', function(event) {
+        set_status("danger", "Upload of firmware failed, please retry by reloading web interface")
+    });
+
+    request.open('POST', origin + '/cgi-bin/cgi-upload');
+    request.send(form_data);
 }
 
 
 function download_image() {
-	// Download image from server once the url was received by upgrade_request
-	hide("#keep_container");
-	hide("#upgrade_button");
-	var download_request = new XMLHttpRequest();
-	download_request.open("GET", data.url + data.files + data.sysupgrade);
-	download_request.responseType = "arraybuffer";
-
-	download_request.onload = function () {
-		if (this.status === 200) {
-			var blob = new Blob([download_request.response], {type: "application/octet-stream"});
-			upload_image(blob)
-		}
-	};
-	set_status("info", "Downloading firmware to web browser memory", true);
-	download_request.send();
+    // Download image from server once the url was received by upgrade_request
+    hide("#keep_container");
+    hide("#upgrade_button");
+    var download_request = new XMLHttpRequest();
+    download_request.open("GET", data.url + data.files + data.sysupgrade);
+    download_request.responseType = "arraybuffer";
+
+    download_request.onload = function() {
+        if (this.status === 200) {
+            var blob = new Blob([download_request.response], {
+                type: "application/octet-stream"
+            });
+            upload_image(blob)
+        }
+    };
+    set_status("info", "Downloading firmware to web browser memory", true);
+    download_request.send();
 }
 
-function server_request(request_dict, path, callback) {
-	var request_json;
-	request_dict.distro = data.release.distribution;
-	request_dict.target = data.release.target;
-	var request = new XMLHttpRequest();
-	request.open("POST", data.url + "/" + path, true);
-	request.setRequestHeader("Content-type", "application/json");
-	request.send(JSON.stringify(request_dict));
-	request.onerror = function(e) {
-		set_status("danger", "Upgrade server down or could not connect")
-		show("#server_div");
-	}
-	request.addEventListener('load', function(event) {
-		var request_text = request.responseText;
-		if (request.status === 200) {
-			callback(request_text)
-
-		} else if (request.status === 202) {
-			var imagebuilder = request.getResponseHeader("X-Imagebuilder-Status");
-			if(imagebuilder === "queue") {
-				// in queue
-				var queue = request.getResponseHeader("X-Build-Queue-Position");
-				set_status("info", "In build queue position " + queue, true)
-				console.log("queued");
-			} else if(imagebuilder === "initialize") {
-				set_status("info", "Setting up ImageBuilder", true)
-				console.log("Setting up imagebuilder");
-			} else if(imagebuilder === "building") {
-				set_status("info", "Building image", true);
-				console.log("building");
-			} else {
-				// fallback if for some reasons the headers are missing e.g. browser blocks access
-				set_status("info", "Processing request", true);
-				console.log(imagebuilder)
-			}
-			setTimeout(function() { server_request(request_dict, path, callback) }, 5000)
-
-		} else if (request.status === 204) {
-			// no upgrades available
-			set_status("success", "No upgrades available")
-
-		} else if (request.status === 400) {
-			// bad request
-			request_json = JSON.parse(request_text)
-			set_status("danger", request_json.error)
-
-		} else if (request.status === 412) {
-			// this is a bit generic
-			set_status("danger", "Unsupported device, release, target, subtraget or board")
-
-		} else if (request.status === 413) {
-		set_status("danger", "No firmware created due to image size. Try again with less packages selected.")
-
-		} else if (request.status === 422) {
-			var package_missing = request.getResponseHeader("X-Unknown-Package");
-			set_status("danger", "Unknown package in request: <b>" + package_missing + "</b>")
-		} else if (request.status === 500) {
-			request_json = JSON.parse(request_text)
-
-			var error_box_content = "<b>Internal server error</b><br />"
-			error_box_content += request_json.error
-			if(request_json.log != undefined) {
-				data.log_url = request_json.log
-			}
-			set_status("danger", error_box_content)
-
-		} else if (request.status === 501) {
-			set_status("danger", "No sysupgrade file produced, may not supported by model.")
-		} else if (request.status === 502) {
-			// python part offline
-			set_status("danger", "Server down for maintenance")
-			setTimeout(function() { server_request(request_dict, path, callback) }, 30000)
-		} else if (request.status === 503) {
-			set_status("danger", "Server overloaded")
-			setTimeout(function() { server_request(request_dict, path, callback) }, 30000)
-		}
-	});
+function server_request(path, callback) {
+    var request_json;
+    var request = new XMLHttpRequest();
+    request.open("POST", data.url + "/" + path, true);
+    request.setRequestHeader("Content-type", "application/json");
+    request.send(JSON.stringify(request_dict));
+    request.onerror = function(e) {
+        set_status("danger", "Upgrade server down or could not connect")
+        show("#server_div");
+    }
+    request.addEventListener('load', function(event) {
+        var request_text = request.responseText;
+        if (request.status === 200) {
+            callback(request_text)
+
+        } else if (request.status === 202) {
+            var imagebuilder = request.getResponseHeader("X-Imagebuilder-Status");
+            if (imagebuilder === "queue") {
+                // in queue
+                var queue = request.getResponseHeader("X-Build-Queue-Position");
+                set_status("info", "In build queue position " + queue, true)
+                console.log("queued");
+            } else if (imagebuilder === "building") {
+                set_status("info", "Building image", true);
+                console.log("building");
+            } else {
+                // fallback if for some reasons the headers are missing e.g. browser blocks access
+                set_status("info", "Processing request", true);
+                console.log(imagebuilder)
+            }
+            setTimeout(function() {
+                server_request(path, callback)
+            }, 5000)
+
+        } else if (request.status === 204) {
+            // no upgrades available
+            set_status("success", "No upgrades available")
+
+        } else if (request.status === 400) {
+            // bad request
+            request_json = JSON.parse(request_text)
+            set_status("danger", request_json.error)
+
+        } else if (request.status === 412) {
+            // this is a bit generic
+            set_status("danger", "Unsupported device, release, target, subtraget or board")
+
+        } else if (request.status === 413) {
+            set_status("danger", "No firmware created due to image size. Try again with less packages selected.")
+
+        } else if (request.status === 422) {
+            var package_missing = request.getResponseHeader("X-Unknown-Package");
+            set_status("danger", "Unknown package in request: <b>" + package_missing + "</b>")
+        } else if (request.status === 500) {
+            request_json = JSON.parse(request_text)
+
+            var error_box_content = "<b>Internal server error</b><br />"
+            error_box_content += request_json.error
+            if (request_json.log != undefined) {
+                data.log_url = request_json.log
+            }
+            set_status("danger", error_box_content)
+
+        } else if (request.status === 501) {
+            set_status("danger", "No sysupgrade file produced, may not supported by model.")
+        } else if (request.status === 502) {
+            // python part offline
+            set_status("danger", "Server down for maintenance")
+            setTimeout(function() {
+                server_request(path, callback)
+            }, 30000)
+        } else if (request.status === 503) {
+            set_status("danger", "Server overloaded")
+            setTimeout(function() {
+                server_request(path, callback)
+            }, 30000)
+        }
+    });
 }
+request_dict = {}
 document.onload = setup()
-- 
2.25.1