Deno Refactor TLS Certs Reading

Last update

Dec 1, 2024

This codemod updates the usage of TLS certificate loading in Deno by replacing deprecated properties with their new counterparts. In Deno V2, loading certificates directly from files is now deprecated. Instead, you should read the certificates yourself.

Before

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
const conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
  certChain: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

After

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
const conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
  cert: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

Before

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
const conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
  certChain: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

After

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
const conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
  cert: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

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