Get access token in Postman from the Salesforce cli via a node server

postman-sf-auth-collection.json

{
  "info": {
    "_postman_id": "35d1388c-2a10-4698-9cd6-6fb250c2b458",
    "name": "Local SF Auth",
    "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json",
    "_exporter_id": "1474473",
    "_collection_link": "https://team-sf.postman.co/workspace/Salesforce~e589a405-8419-4e78-9608-343f0d307f55/collection/1474473-35d1388c-2a10-4698-9cd6-6fb250c2b458?action=share&source=collection_link&creator=1474473"
  },
  "item": [
    {
      "name": "Get Token From CLI",
      "event": [
        {
          "listen": "test",
          "script": {
            "exec": [
              "pm.test(\"Set Access Token\", function () {",
              "    var jsonData = pm.response.json();",
              "    pm.expect(jsonData.accessToken).to.not.be.undefined;",
              "    pm.environment.set(\"_accessToken\", jsonData.accessToken);",
              "    pm.environment.set(\"_endpoint\",jsonData.instanceUrl);",
              "});"
            ],
            "type": "text/javascript",
            "packages": {}
          }
        }
      ],
      "protocolProfileBehavior": {
        "disabledSystemHeaders": {
          "accept": true
        }
      },
      "request": {
        "auth": {
          "type": "bearer",
          "bearer": [
            {
              "key": "token",
              "value": "someauthtoken",
              "type": "string"
            }
          ]
        },
        "method": "GET",
        "header": [
          {
            "key": "Accept",
            "value": "application/json",
            "type": "text"
          }
        ],
        "url": {
          "raw": "http://localhost:{{port}}?username={{username}}",
          "protocol": "http",
          "host": [
            "localhost"
          ],
          "port": "{{port}}",
          "query": [
            {
              "key": "username",
              "value": "{{username}}"
            }
          ]
        }
      },
      "response": []
    }
  ],
  "variable": [
    {
      "key": "port",
      "value": "",
      "type": "default"
    }
  ]
}

server.mjs

import { exec } from "child_process";
import http from "http";

http
  .createServer((req, res) => {
    if (req.headers.authorization !== "Bearer someauthtoken") {
      res.writeHead(401).end();
      return;
    }
    const username = new URL(req.url, "http://localhost").searchParams.get(
      "username",
    );

    exec(`sf org display -o ${username} --json`, (err, stdout) => {
      if (err)
        return res
          .writeHead(500)
          .end(JSON.stringify({ error: "CLI execution failed" }));

      try {
        const result = JSON.parse(stdout);
        res.setHeader("Content-Type", "application/json");
        res.writeHead(200).end(JSON.stringify(result.result));
      } catch (e) {
        res.writeHead(500).end(JSON.stringify({ error: "JSON parse error" }));
      }
    });
  })
  .listen(process.env.PORT || 8787, () => {
    console.log("Server is listening on port " + (process.env.PORT || 8787));
  });