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webterm.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>WebTerm</title>
<style>
body {
font-family: monospace;
background-color: #000000;
color: rgb(255, 255, 255);
padding: 20px;
}
.cmd-line {
display: flex;
font: 1em sans-serif;
}
.cmd-line>span {
margin-right: 5px;
}
.cmd-input {
flex: 1;
border: none;
background: none;
color: inherit;
font: inherit;
outline: none;
white-space: pre;
}
.cmd-warn {
color: #ffff00;
}
.cmd-success {
color: #00ff00;
}
.cmd-error {
color: #ff0000;
}
</style>
</head>
<body>
<div id="cmd-container">
<div class="cmd-line">
<span>欢迎使用WebTerm功能，本终端将在线输入的SQL语句于数据库中执行查询，请注意使用时不要写错语句。</span>
</div>
<div class="cmd-line">
<span>WebTerm为简易实现，并未使用任何库，程序报错返回错误色</span>
<span class="cmd-error">[红色]</span>
<span>警告色</span>
<span class="cmd-warn">[黄色]</span>
<span>正常与成功色</span>
<span class="cmd-success">[绿色]</span>
</div>
<div class="cmd-line">
<span>部分危险语句即使正常执行也会标记为</span> <span class="cmd-warn">[警告色]</span>
</div>
<div class="cmd-line">
<span>WebTerm支持多行输入，只需Shift+Enter即可换行，支持按上下键回溯输入内容。</span>
</div>
<div class="cmd-line">
<span id="pretext"></span>
</div>
<div class="cmd-line">
<span>></span>
<div class="cmd-input" contenteditable="true"></div>
</div>
</div>
<script src="./comweb.js"></script>
<script>
let datetime = new Date();
let year = datetime.getFullYear();
let month = datetime.getMonth() + 1;
let day = datetime.getDate();
let hour = datetime.getHours();
let minute = datetime.getMinutes();
let second = datetime.getSeconds();
document.getElementById('pretext').innerText = "本次启动于" + year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
let inputs = [];
let lastinput = "";
let arrowidx = -1;
let lastnewinput = document.querySelector('.cmd-input');
function wraprawstr() {
lastnewinput.addEventListener('paste', (e) => {
//不带格式的粘贴
e.preventDefault();
const text = e.clipboardData.getData('text/plain');
document.execCommand('insertText', false, text);
});
}
wraprawstr();
document.addEventListener('DOMContentLoaded', () => {
const cmdContainer = document.getElementById('cmd-container');
function setCaretAtEnd(elem) {
const range = document.createRange();
const sel = window.getSelection();
range.selectNodeContents(elem);
range.collapse(false);
sel.removeAllRanges();
sel.addRange(range);
elem.focus();
}
cmdContainer.addEventListener('keydown', (e) => {
if (e.target.classList.contains('cmd-input')) {
if (e.key === 'Enter' && !e.shiftKey) {
e.preventDefault();
const inputLine = e.target.innerText;
executeCommand(inputLine);
} else if (e.key === 'ArrowUp') {
e.preventDefault();
if (inputs.length > 0) {
if (arrowidx == -1) {
lastinput = e.target.innerText || "";
arrowidx = inputs.length;
}
if (arrowidx == 0) { arrowidx = 1; }
arrowidx = arrowidx - 1;
e.target.innerText = inputs[arrowidx];
setCaretAtEnd(e.target);
}
} else if (e.key === 'ArrowDown') {
e.preventDefault();
if (arrowidx != -1 && inputs.length > 0) {
if (arrowidx == inputs.length - 1) {
e.target.innerText = lastinput;
arrowidx = -1;
} else {
arrowidx = arrowidx + 1;
e.target.innerText = inputs[arrowidx];
}
setCaretAtEnd(e.target);
}
}
}
});
lastnewinput.focus();
document.addEventListener('click', (e) => {
lastnewinput.focus();
});
function isDangerousSQL(sql) {
const dangerousKeywords = ['DROP', 'DELETE', 'UPDATE', 'ALTER', 'CREATE', 'TRUNCATE'];
const hasDangerousKeyword = dangerousKeywords.some(keyword => sql.toUpperCase().includes(keyword));
const hasUnsafeInput = sql.includes('--') || sql.includes(';');
return hasDangerousKeyword || hasUnsafeInput;
}
async function sqlRun(query) {
const response = await fetch('/webterm/exec', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
token: getToken(),
query: query
})
});
const result = await response.json();
if (result.status != 1) {
return ['Warn', result.msg];
} else {
if (result.success) {
if (isDangerousSQL(query)) {
return ['Warn', JSON.stringify(result.msg, null, 4)];
} else {
return ['Success', JSON.stringify(result.msg, null, 4)];
}
} else {
return ['Error', result.msg];
}
}
}
async function executeCommand(inputLine) {
inputs.push(inputLine);
const currentInput = document.querySelector('.cmd-input');
currentInput.contentEditable = 'false';
const outputLine = document.createElement('div');
outputLine.classList.add('cmd-line');
const output = await sqlRun(inputLine);
console.log(output);
if (output[0] === 'Warn') {
outputLine.innerHTML = '<div class="cmd-input cmd-warn">' + output[1] + '</div>';
} else if (output[0] === 'Success') {
outputLine.innerHTML = '<div class="cmd-input cmd-success">' + output[1] + '</div>';
} else if (output[0] === 'Error') {
outputLine.innerHTML = '<div class="cmd-input cmd-error">' + output[1] + '</div>';
} else {
outputLine.innerHTML = '<div class="cmd-input">' + output[1] + '</div>';
}
cmdContainer.appendChild(outputLine);
const newCmdLine = document.createElement('div');
newCmdLine.classList.add('cmd-line');
newCmdLine.innerHTML = '<span>></span><div class="cmd-input" contenteditable="true"></div>';
cmdContainer.appendChild(newCmdLine);
lastnewinput = newCmdLine.querySelector('.cmd-input');
lastnewinput.focus();
lastinput = "";
arrowidx = -1;
wraprawstr();
}
});
</script>
</body>
</html>