main.ts

import './setup-logger'; // This should be first
import { Realm, VirtualNetwork, logger } from '@cardstack/runtime-common';
import { NodeAdapter } from './node-realm';
import yargs from 'yargs';
import { RealmServer } from './server';
import { resolve, join } from 'path';
import { makeFastBootIndexRunner } from './fastboot';
import { RunnerOptionsManager } from '@cardstack/runtime-common/search-index';
import { readFileSync } from 'fs-extra';
import { shimExternals } from './lib/externals';
import { type RealmPermissions as RealmPermissionsInterface } from '@cardstack/runtime-common/realm';
import * as Sentry from '@sentry/node';
import { setErrorReporter } from '@cardstack/runtime-common/realm';

import fs from 'fs';

let log = logger('main');

if (process.env.REALM_SENTRY_DSN) {
  log.info('Setting up Sentry.');
  Sentry.init({
    dsn: process.env.REALM_SENTRY_DSN,
    environment: process.env.REALM_SENTRY_ENVIRONMENT || 'development',
  });

  setErrorReporter(Sentry.captureException);
} else {
  log.warn(
    `No REALM_SENTRY_DSN environment variable found, skipping Sentry setup.`,
  );
}

const REALM_SECRET_SEED = process.env.REALM_SECRET_SEED;
if (!REALM_SECRET_SEED) {
  console.error(
    `The REALM_SECRET_SEED environment variable is not set. Please make sure this env var has a value`,
  );
  process.exit(-1);
}

let {
  port,
  distDir = join(__dirname, '..', 'host', 'dist'),
  distURL,
  path: paths,
  fromUrl: fromUrls,
  toUrl: toUrls,
  useTestingDomain,
  username: usernames,
  password: passwords,
  matrixURL: matrixURLs,
} = yargs(process.argv.slice(2))
  .usage('Start realm server')
  .options({
    port: {
      description: 'port number',
      demandOption: true,
      type: 'number',
    },
    fromUrl: {
      description: 'the source of the realm URL proxy',
      demandOption: true,
      type: 'array',
    },
    toUrl: {
      description: 'the target of the realm URL proxy',
      demandOption: true,
      type: 'array',
    },
    path: {
      description: 'realm directory path',
      demandOption: true,
      type: 'array',
    },
    distDir: {
      description:
        "the dist/ folder of the host app. Defaults to '../host/dist'",
      type: 'string',
    },
    distURL: {
      description:
        'the URL of a deployed host app. (This can be provided instead of the --distPath)',
      type: 'string',
    },
    useTestingDomain: {
      description:
        'relaxes document domain rules so that cross origin scripting can be used for test assertions across iframe boundaries',
      type: 'boolean',
    },
    matrixURL: {
      description: 'The matrix homeserver for the realm',
      demandOption: true,
      type: 'array',
    },
    username: {
      description: 'The matrix username for the realm user',
      demandOption: true,
      type: 'array',
    },
    password: {
      description: 'The matrix password for the realm user',
      demandOption: true,
      type: 'array',
    },
  })
  .parseSync();

if (fromUrls.length !== toUrls.length) {
  console.error(
    `Mismatched number of URLs, the --fromUrl params must be matched to the --toUrl params`,
  );
  process.exit(-1);
}
if (fromUrls.length < paths.length) {
  console.error(
    `not enough url pairs were provided to satisfy the paths provided. There must be at least one --fromUrl/--toUrl pair for each --path parameter`,
  );
  process.exit(-1);
}

if (
  paths.length !== usernames.length ||
  usernames.length !== passwords.length ||
  paths.length !== matrixURLs.length
) {
  console.error(
    `not enough username/password pairs were provided to satisfy the paths provided. There must be at least one --username/--password/--matrixURL set for each --path parameter`,
  );
  process.exit(-1);
}

let virtualNetwork = new VirtualNetwork();
let loader = virtualNetwork.createLoader();
shimExternals(virtualNetwork);

let urlMappings = fromUrls.map((fromUrl, i) => [
  new URL(String(fromUrl), `http://localhost:${port}`),
  new URL(String(toUrls[i]), `http://localhost:${port}`),
]);
for (let [from, to] of urlMappings) {
  loader.addURLMapping(from, to);
}
let hrefs = urlMappings.map(([from, to]) => [from.href, to.href]);
let dist: string | URL;
if (distURL) {
  dist = new URL(distURL);
} else {
  dist = resolve(distDir);
}

(async () => {
  let realms: Realm[] = [];
  for (let [i, path] of paths.entries()) {
    let url = hrefs[i][0];
    let manager = new RunnerOptionsManager();
    let matrixURL = String(matrixURLs[i]);
    if (matrixURL.length === 0) {
      console.error(`missing matrix URL for realm ${url}`);
      process.exit(-1);
    }
    let username = String(usernames[i]);
    if (username.length === 0) {
      console.error(`missing username for realm ${url}`);
      process.exit(-1);
    }
    let password = String(passwords[i]);
    if (password.length === 0) {
      console.error(`missing password for realm ${url}`);
      process.exit(-1);
    }
    let { getRunner, distPath } = await makeFastBootIndexRunner(
      dist,
      manager.getOptions.bind(manager),
    );

    let realmPermissions = getRealmPermissions(url);

    realms.push(
      new Realm(
        {
          url,
          adapter: new NodeAdapter(resolve(String(path))),
          loader,
          indexRunner: getRunner,
          runnerOptsMgr: manager,
          getIndexHTML: async () =>
            readFileSync(join(distPath, 'index.html')).toString(),
          matrix: { url: new URL(matrixURL), username, password },
          realmSecretSeed: REALM_SECRET_SEED,
          permissions: realmPermissions.users,
        },
        {
          deferStartUp: true,
          ...(useTestingDomain
            ? {
                useTestingDomain,
              }
            : {}),
        },
      ),
    );
  }

  let server = new RealmServer(realms, {
    ...(distURL ? { assetsURL: new URL(distURL) } : {}),
  });

  server.listen(port);
  log.info(`Realm server listening on port ${port}:`);
  let additionalMappings = hrefs.slice(paths.length);
  for (let [index, { url }] of realms.entries()) {
    log.info(`    ${url} => ${hrefs[index][1]}, serving path ${paths[index]}`);
  }
  if (additionalMappings.length) {
    log.info('Additional URL mappings:');
    for (let [from, to] of additionalMappings) {
      log.info(`    ${from} => ${to}`);
    }
  }
  log.info(`Using host dist path: '${distDir}' for card pre-rendering`);

  for (let realm of realms) {
    log.info(`Starting realm ${realm.url}...`);
    await realm.start();
    log.info(
      `Realm ${realm.url} has started (${JSON.stringify(
        realm.searchIndex.stats,
        null,
        2,
      )})`,
    );
  }
})().catch((e: any) => {
  console.error(
    `Unexpected error encountered starting realm, stopping server`,
    e,
  );
  process.exit(1);
});

function getRealmPermissions(realmUrl: string) {
  let userPermissions = {} as {
    [realmUrl: string]: { users: RealmPermissionsInterface };
  };
  let userPermissionsjsonContent;

  if (['development', 'test'].includes(process.env.NODE_ENV || '')) {
    userPermissionsjsonContent = fs.readFileSync(
      `.realms.json.${process.env.NODE_ENV}`,
      'utf-8',
    );
  } else {
    userPermissionsjsonContent = process.env.REALM_USER_PERMISSIONS;
    if (!userPermissionsjsonContent) {
      throw new Error(
        `REALM_USER_PERMISSIONS env var is blank. It should have a JSON string value that looks like this:
          {
            "https://realm-url-1/": {
              "users":{
                "*":["read"],
                "@hassan:boxel.ai":["read", "write"],
                ...
              }
            },
            "https://realm-url-2/": { ... }
          }
        `,
      );
    }
  }

  try {
    userPermissions = JSON.parse(userPermissionsjsonContent);
  } catch (error: any) {
    throw new Error(
      `Error while JSON parsing user permissions: ${userPermissionsjsonContent}`,
    );
  }

  if (!userPermissions[realmUrl]) {
    throw new Error(
      `Missing permissions for realm ${realmUrl} in config ${userPermissionsjsonContent}`,
    );
  }

  return userPermissions[realmUrl];
}