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main.ts
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// Copyright (c) 2023 Diego de Alcântara
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
const AUTH = "YOUR_AUTH_KEY"; // Bearer Token
const ZONE = "YOUR_ZONE";
const SUBDOMAIN = "login";
const r = await fetch("https://api.ipify.org");
const ip = await r.text();
console.log("Public Address:", ip);
let ipv4_regex = /^(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:\.(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}$/gm;
if (!ipv4_regex.test(ip)) {
console.log("%cINVALID IP ADDRESS", "color: red; font-weight: bold");
Deno.exit(1);
}
const listDns: string =
`https://api.cloudflare.com/client/v4/zones/${ZONE}/dns_records`;
const listDnsReq = await fetch(listDns, {
headers: {
Authorization: `Bearer ${AUTH}`,
},
});
const list = await listDnsReq.json();
if (!("result" in list)) {
throw "error";
}
const result = list.result.filter((x: object) =>
"name" in x && (x['name'] as string).startsWith(SUBDOMAIN + ".");
);
if (result.length === 0) {
throw "result length is 0";
}
const identifier = result[0].id;
const currentCfIp = result[0].content;
if (currentCfIp === ip) {
console.log("%cUPDATE SKIPPED", "color: yellow; font-weight: bold");
Deno.exit(0);
}
const updateUrl: string =
`https://api.cloudflare.com/client/v4/zones/${ZONE}/dns_records/${identifier}`;
const updateResult = await fetch(updateUrl, {
method: "PUT",
headers: {
Authorization: `Bearer ${AUTH}`,
},
body: JSON.stringify({
content: ip,
name: SUBDOMAIN,
proxied: false,
type: "A",
comment: "",
tags: [],
ttl: 3600,
}),
});
if (updateResult.status === 200) {
console.log("%cUPDATE OK", "color: green; font-weight: bold");
} else {
console.log("%cUPDATE FAILED", "color: red; font-weight: bold");
}