insomnia-template-tag.js

/**
 * See: https://support.insomnia.rest/article/26-plugins#template-tags
 */
const fs = require('fs')
const jwt = require('jsonwebtoken')
//
const createApp = function ({id, cert}) {
  return function () {
    const payload = {
      iat: Math.floor(new Date() / 1000), // Issued at time
      exp: Math.floor(new Date() / 1000) + 60, // JWT expiration time
      iss: id // GitHub App ID
    }

    // Sign with RSA SHA256
    return jwt.sign(payload, cert, {algorithm: 'RS256'})
  }
}

// module.exports.requestHooks = [
//   context => {
//     context.request.setHeader('Authorization', `bearer ${app()}`);
//     context.request.setHeader('Accept', 'application/vnd.github.machine-man-preview+json');
//   }
// ];


module.exports.templateTags = [{
    name: 'jwt',
    displayName: 'JSON Web Token',
    description: 'https://developer.github.com/apps/building-github-apps/authentication-options-for-github-apps/#authenticating-as-a-github-app',
    args: [
        {
          displayName: 'ID',
          description: 'ID of GitHub App',
          type: 'number'
        },
        {
            displayName: 'Private key file',
            description: 'Path to private key file',
            type: 'string'
        }
    ],
    async run (context, id, path) {
      const cert = fs.readFileSync(path)
      const app = createApp({
        id: id,
        cert: cert
      })

      return app()
    }
}];