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lovebird.lua
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--
-- lovebird
--
-- Copyright (c) 2017 rxi
--
-- This library is free software; you can redistribute it and/or modify it
-- under the terms of the MIT license. See LICENSE for details.
--
local socket = require "socket"
local lovebird = { _version = "0.4.2" }
lovebird.loadstring = loadstring or load
lovebird.inited = false
lovebird.host = "*"
lovebird.buffer = ""
lovebird.lines = {}
lovebird.connections = {}
lovebird.pages = {}
lovebird.wrapprint = true
lovebird.timestamp = true
lovebird.allowhtml = false
lovebird.echoinput = true
lovebird.port = 8000
lovebird.whitelist = { "127.0.0.1" }
lovebird.maxlines = 200
lovebird.updateinterval = .5
lovebird.pages["index"] = [[
<?lua
-- Handle console input
if req.parsedbody.input then
local str = req.parsedbody.input
if lovebird.echoinput then
lovebird.pushline({ type = 'input', str = str })
end
if str:find("^=") then
str = "print(" .. str:sub(2) .. ")"
end
xpcall(function() assert(lovebird.loadstring(str, "input"))() end,
lovebird.onerror)
end
?>
<!doctype html>
<html>
<head>
<meta http-equiv="x-ua-compatible" content="IE=Edge"/>
<title>lovebird</title>
<style>
body {
margin: 0px;
font-size: 14px;
font-family: helvetica, verdana, sans;
background: #FFFFFF;
}
form {
margin-bottom: 0px;
}
.timestamp {
color: #909090;
padding-right: 4px;
}
.repeatcount {
color: #F0F0F0;
background: #505050;
font-size: 11px;
font-weight: bold;
text-align: center;
padding-left: 4px;
padding-right: 4px;
padding-top: 0px;
padding-bottom: 0px;
border-radius: 7px;
display: inline-block;
}
.errormarker {
color: #F0F0F0;
background: #8E0000;
font-size: 11px;
font-weight: bold;
text-align: center;
border-radius: 8px;
width: 17px;
padding-top: 0px;
padding-bottom: 0px;
display: inline-block;
}
.greybordered {
margin: 12px;
background: #F0F0F0;
border: 1px solid #E0E0E0;
border-radius: 3px;
}
.inputline {
font-family: mono, courier;
font-size: 13px;
color: #606060;
}
.inputline:before {
content: '\00B7\00B7\00B7';
padding-right: 5px;
}
.errorline {
color: #8E0000;
}
#header {
background: #101010;
height: 25px;
color: #F0F0F0;
padding: 9px
}
#title {
float: left;
font-size: 20px;
}
#title a {
color: #F0F0F0;
text-decoration: none;
}
#title a:hover {
color: #FFFFFF;
}
#version {
font-size: 10px;
}
#status {
float: right;
font-size: 14px;
padding-top: 4px;
}
#main a {
color: #000000;
text-decoration: none;
background: #E0E0E0;
border: 1px solid #D0D0D0;
border-radius: 3px;
padding-left: 2px;
padding-right: 2px;
display: inline-block;
}
#main a:hover {
background: #D0D0D0;
border: 1px solid #C0C0C0;
}
#console {
position: absolute;
top: 40px; bottom: 0px; left: 0px; right: 312px;
}
#input {
position: absolute;
margin: 10px;
bottom: 0px; left: 0px; right: 0px;
}
#inputbox {
width: 100%;
font-family: mono, courier;
font-size: 13px;
}
#output {
overflow-y: scroll;
position: absolute;
margin: 10px;
line-height: 17px;
top: 0px; bottom: 36px; left: 0px; right: 0px;
}
#env {
position: absolute;
top: 40px; bottom: 0px; right: 0px;
width: 300px;
}
#envheader {
padding: 5px;
background: #E0E0E0;
}
#envvars {
position: absolute;
left: 0px; right: 0px; top: 25px; bottom: 0px;
margin: 10px;
overflow-y: scroll;
font-size: 12px;
}
</style>
</head>
<body>
<div id="header">
<div id="title">
<a href="https://github.com/rxi/lovebird">lovebird</a>
<span id="version"><?lua echo(lovebird._version) ?></span>
</div>
<div id="status"></div>
</div>
<div id="main">
<div id="console" class="greybordered">
<div id="output"> <?lua echo(lovebird.buffer) ?> </div>
<div id="input">
<form method="post"
onkeydown="return onInputKeyDown(event);"
onsubmit="onInputSubmit(); return false;">
<input id="inputbox" name="input" type="text"
autocomplete="off"></input>
</form>
</div>
</div>
<div id="env" class="greybordered">
<div id="envheader"></div>
<div id="envvars"></div>
</div>
</div>
<script>
document.getElementById("inputbox").focus();
var changeFavicon = function(href) {
var old = document.getElementById("favicon");
if (old) document.head.removeChild(old);
var link = document.createElement("link");
link.id = "favicon";
link.rel = "shortcut icon";
link.href = href;
document.head.appendChild(link);
}
var truncate = function(str, len) {
if (str.length <= len) return str;
return str.substring(0, len - 3) + "...";
}
var geturl = function(url, onComplete, onFail) {
var req = new XMLHttpRequest();
req.onreadystatechange = function() {
if (req.readyState != 4) return;
if (req.status == 200) {
if (onComplete) onComplete(req.responseText);
} else {
if (onFail) onFail(req.responseText);
}
}
url += (url.indexOf("?") > -1 ? "&_=" : "?_=") + Math.random();
req.open("GET", url, true);
req.send();
}
var divContentCache = {}
var updateDivContent = function(id, content) {
if (divContentCache[id] != content) {
document.getElementById(id).innerHTML = content;
divContentCache[id] = content
return true;
}
return false;
}
var onInputSubmit = function() {
var b = document.getElementById("inputbox");
var req = new XMLHttpRequest();
req.open("POST", "/", true);
req.send("input=" + encodeURIComponent(b.value));
/* Do input history */
if (b.value && inputHistory[0] != b.value) {
inputHistory.unshift(b.value);
}
inputHistory.index = -1;
/* Reset */
b.value = "";
refreshOutput();
}
/* Input box history */
var inputHistory = [];
inputHistory.index = 0;
var onInputKeyDown = function(e) {
var key = e.which || e.keyCode;
if (key != 38 && key != 40) return true;
var b = document.getElementById("inputbox");
if (key == 38 && inputHistory.index < inputHistory.length - 1) {
/* Up key */
inputHistory.index++;
}
if (key == 40 && inputHistory.index >= 0) {
/* Down key */
inputHistory.index--;
}
b.value = inputHistory[inputHistory.index] || "";
b.selectionStart = b.value.length;
return false;
}
/* Output buffer and status */
var refreshOutput = function() {
geturl("/buffer", function(text) {
updateDivContent("status", "connected ●");
if (updateDivContent("output", text)) {
var div = document.getElementById("output");
div.scrollTop = div.scrollHeight;
}
/* Update favicon */
changeFavicon("data:image/png;base64," +
"iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAP1BMVEUAAAAAAAAAAAD////19fUO"+
"Dg7v7+/h4eGzs7MlJSUeHh7n5+fY2NjJycnGxsa3t7eioqKfn5+QkJCHh4d+fn7zU+b5AAAAAnRS"+
"TlPlAFWaypEAAABRSURBVBjTfc9HDoAwDERRQ+w0ern/WQkZaUBC4e/mrWzppH9VJjbjZg1Ii2rM"+
"DyR1JZ8J0dVWggIGggcEwgbYCRbuPRqgyjHNpzUP+39GPu9fgloC5L9DO0sAAAAASUVORK5CYII="
);
},
function(text) {
updateDivContent("status", "disconnected ○");
/* Update favicon */
changeFavicon("data:image/png;base64," +
"iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAYFBMVEUAAAAAAAAAAADZ2dm4uLgM"+
"DAz29vbz8/Pv7+/h4eHIyMiwsLBtbW0lJSUeHh4QEBDn5+fS0tLDw8O0tLSioqKfn5+QkJCHh4d+"+
"fn5ycnJmZmZgYGBXV1dLS0tFRUUGBgZ0He44AAAAAnRSTlPlAFWaypEAAABeSURBVBjTfY9HDoAw"+
"DAQD6Z3ey/9/iXMxkVDYw0g7F3tJReosUKHnwY4pCM+EtOEVXrb7wVRA0dMbaAcUwiVeDQq1Jp4a"+
"xUg5kE0ooqZu68Di2Tgbs/DiY/9jyGf+AyFKBAK7KD2TAAAAAElFTkSuQmCC"
);
});
}
setInterval(refreshOutput,
<?lua echo(lovebird.updateinterval) ?> * 1000);
/* Environment variable view */
var envPath = "";
var refreshEnv = function() {
geturl("/env.json?p=" + envPath, function(text) {
var json = eval("(" + text + ")");
/* Header */
var html = "<a href='#' onclick=\"setEnvPath('')\">env</a>";
var acc = "";
var p = json.path != "" ? json.path.split(".") : [];
for (var i = 0; i < p.length; i++) {
acc += "." + p[i];
html += " <a href='#' onclick=\"setEnvPath('" + acc + "')\">" +
truncate(p[i], 10) + "</a>";
}
updateDivContent("envheader", html);
/* Handle invalid table path */
if (!json.valid) {
updateDivContent("envvars", "Bad path");
return;
}
/* Variables */
var html = "<table>";
for (var i = 0; json.vars[i]; i++) {
var x = json.vars[i];
var fullpath = (json.path + "." + x.key).replace(/^\./, "");
var k = truncate(x.key, 15);
if (x.type == "table") {
k = "<a href='#' onclick=\"setEnvPath('" + fullpath + "')\">" +
k + "</a>";
}
var v = "<a href='#' onclick=\"insertVar('" +
fullpath.replace(/\.(-?[0-9]+)/g, "[$1]") +
"');\">" + x.value + "</a>"
html += "<tr><td>" + k + "</td><td>" + v + "</td></tr>";
}
html += "</table>";
updateDivContent("envvars", html);
});
}
var setEnvPath = function(p) {
envPath = p;
refreshEnv();
}
var insertVar = function(p) {
var b = document.getElementById("inputbox");
b.value += p;
b.focus();
}
setInterval(refreshEnv, <?lua echo(lovebird.updateinterval) ?> * 1000);
</script>
</body>
</html>
]]
lovebird.pages["buffer"] = [[ <?lua echo(lovebird.buffer) ?> ]]
lovebird.pages["env.json"] = [[
<?lua
local t = _G
local p = req.parsedurl.query.p or ""
p = p:gsub("%.+", "."):match("^[%.]*(.*)[%.]*$")
if p ~= "" then
for x in p:gmatch("[^%.]+") do
t = t[x] or t[tonumber(x)]
-- Return early if path does not exist
if type(t) ~= "table" then
echo('{ "valid": false, "path": ' .. string.format("%q", p) .. ' }')
return
end
end
end
?>
{
"valid": true,
"path": "<?lua echo(p) ?>",
"vars": [
<?lua
local keys = {}
for k in pairs(t) do
if type(k) == "number" or type(k) == "string" then
table.insert(keys, k)
end
end
table.sort(keys, lovebird.compare)
for _, k in pairs(keys) do
local v = t[k]
?>
{
"key": "<?lua echo(k) ?>",
"value": <?lua echo(
string.format("%q",
lovebird.truncate(
lovebird.htmlescape(
tostring(v)), 26))) ?>,
"type": "<?lua echo(type(v)) ?>",
},
<?lua end ?>
]
}
]]
function lovebird.init()
-- Init server
lovebird.server = assert(socket.bind(lovebird.host, lovebird.port))
lovebird.addr, lovebird.port = lovebird.server:getsockname()
lovebird.server:settimeout(0)
-- Wrap print
lovebird.origprint = print
if lovebird.wrapprint then
local oldprint = print
print = function(...)
oldprint(...)
lovebird.print(...)
end
end
-- Compile page templates
for k, page in pairs(lovebird.pages) do
lovebird.pages[k] = lovebird.template(page, "lovebird, req",
"pages." .. k)
end
lovebird.inited = true
end
function lovebird.template(str, params, chunkname)
params = params and ("," .. params) or ""
local f = function(x) return string.format(" echo(%q)", x) end
str = ("?>"..str.."<?lua"):gsub("%?>(.-)<%?lua", f)
str = "local echo " .. params .. " = ..." .. str
local fn = assert(lovebird.loadstring(str, chunkname))
return function(...)
local output = {}
local echo = function(str) table.insert(output, str) end
fn(echo, ...)
return table.concat(lovebird.map(output, tostring))
end
end
function lovebird.map(t, fn)
local res = {}
for k, v in pairs(t) do res[k] = fn(v) end
return res
end
function lovebird.trace(...)
local str = "[lovebird] " .. table.concat(lovebird.map({...}, tostring), " ")
print(str)
if not lovebird.wrapprint then lovebird.print(str) end
end
function lovebird.unescape(str)
local f = function(x) return string.char(tonumber("0x"..x)) end
return (str:gsub("%+", " "):gsub("%%(..)", f))
end
function lovebird.parseurl(url)
local res = {}
res.path, res.search = url:match("/([^%?]*)%??(.*)")
res.query = {}
for k, v in res.search:gmatch("([^&^?]-)=([^&^#]*)") do
res.query[k] = lovebird.unescape(v)
end
return res
end
function lovebird.htmlescape(str)
return str:gsub("<", "<")
end
function lovebird.truncate(str, len)
if #str <= len then
return str
end
return str:sub(1, len - 3) .. "..."
end
function lovebird.compare(a, b)
local na, nb = tonumber(a), tonumber(b)
if na then
if nb then return na < nb end
return false
elseif nb then
return true
end
return tostring(a) < tostring(b)
end
function lovebird.checkwhitelist(addr)
if lovebird.whitelist == nil then return true end
for _, a in pairs(lovebird.whitelist) do
local ptn = "^" .. a:gsub("%.", "%%."):gsub("%*", "%%d*") .. "$"
if addr:match(ptn) then return true end
end
return false
end
function lovebird.clear()
lovebird.lines = {}
lovebird.buffer = ""
end
function lovebird.pushline(line)
line.time = os.time()
line.count = 1
table.insert(lovebird.lines, line)
if #lovebird.lines > lovebird.maxlines then
table.remove(lovebird.lines, 1)
end
lovebird.recalcbuffer()
end
function lovebird.recalcbuffer()
local function doline(line)
local str = line.str
if not lovebird.allowhtml then
str = lovebird.htmlescape(line.str):gsub("\n", "<br>")
end
if line.type == "input" then
str = '<span class="inputline">' .. str .. '</span>'
else
if line.type == "error" then
str = '<span class="errormarker">!</span> ' .. str
str = '<span class="errorline">' .. str .. '</span>'
end
if line.count > 1 then
str = '<span class="repeatcount">' .. line.count .. '</span> ' .. str
end
if lovebird.timestamp then
str = os.date('<span class="timestamp">%H:%M:%S</span> ', line.time) ..
str
end
end
return str
end
lovebird.buffer = table.concat(lovebird.map(lovebird.lines, doline), "<br>")
end
function lovebird.print(...)
local t = {}
for i = 1, select("#", ...) do
table.insert(t, tostring(select(i, ...)))
end
local str = table.concat(t, " ")
local last = lovebird.lines[#lovebird.lines]
if last and str == last.str then
-- Update last line if this line is a duplicate of it
last.time = os.time()
last.count = last.count + 1
lovebird.recalcbuffer()
else
-- Create new line
lovebird.pushline({ type = "output", str = str })
end
end
function lovebird.onerror(err)
lovebird.pushline({ type = "error", str = err })
if lovebird.wrapprint then
lovebird.origprint("[lovebird] ERROR: " .. err)
end
end
function lovebird.onrequest(req, client)
local page = req.parsedurl.path
page = page ~= "" and page or "index"
-- Handle "page not found"
if not lovebird.pages[page] then
return "HTTP/1.1 404\r\nContent-Length: 8\r\n\r\nBad page"
end
-- Handle page
local str
xpcall(function()
local data = lovebird.pages[page](lovebird, req)
str = "HTTP/1.1 200 OK\r\n" ..
"Content-Length: " .. #data .. "\r\n" ..
"\r\n" .. data
end, lovebird.onerror)
return str
end
function lovebird.receive(client, pattern)
while 1 do
local data, msg = client:receive(pattern)
if not data then
if msg == "timeout" then
-- Wait for more data
coroutine.yield(true)
else
-- Disconnected -- yielding nil means we're done
coroutine.yield(nil)
end
else
return data
end
end
end
function lovebird.send(client, data)
local idx = 1
while idx < #data do
local res, msg = client:send(data, idx)
if not res and msg == "closed" then
-- Handle disconnect
coroutine.yield(nil)
else
idx = idx + res
coroutine.yield(true)
end
end
end
function lovebird.onconnect(client)
-- Create request table
local requestptn = "(%S*)%s*(%S*)%s*(%S*)"
local req = {}
req.socket = client
req.addr, req.port = client:getsockname()
req.request = lovebird.receive(client, "*l")
req.method, req.url, req.proto = req.request:match(requestptn)
req.headers = {}
while 1 do
local line, msg = lovebird.receive(client, "*l")
if not line or #line == 0 then break end
local k, v = line:match("(.-):%s*(.*)$")
req.headers[k] = v
end
if req.headers["Content-Length"] then
req.body = lovebird.receive(client, req.headers["Content-Length"])
end
-- Parse body
req.parsedbody = {}
if req.body then
for k, v in req.body:gmatch("([^&]-)=([^&^#]*)") do
req.parsedbody[k] = lovebird.unescape(v)
end
end
-- Parse request line's url
req.parsedurl = lovebird.parseurl(req.url)
-- Handle request; get data to send and send
local data = lovebird.onrequest(req)
lovebird.send(client, data)
-- Clear up
client:close()
end
function lovebird.update()
if not lovebird.inited then lovebird.init() end
-- Handle new connections
while 1 do
-- Accept new connections
local client = lovebird.server:accept()
if not client then break end
client:settimeout(0)
local addr = client:getsockname()
if lovebird.checkwhitelist(addr) then
-- Connection okay -- create and add coroutine to set
local conn = coroutine.wrap(function()
xpcall(function() lovebird.onconnect(client) end, function() end)
end)
lovebird.connections[conn] = true
else
-- Reject connection not on whitelist
lovebird.trace("got non-whitelisted connection attempt: ", addr)
client:close()
end
end
-- Handle existing connections
for conn in pairs(lovebird.connections) do
-- Resume coroutine, remove if it has finished
local status = conn()
if status == nil then
lovebird.connections[conn] = nil
end
end
end
return lovebird