@backstage/backend-defaults/dist/entrypoints/auth/DefaultAuthService.cjs.js

Backend defaults used by Backstage backend apps

'use strict';

var errors = require('@backstage/errors');
var jose = require('jose');
var helpers = require('./helpers.cjs.js');

class DefaultAuthService {
  constructor(userTokenHandler, pluginTokenHandler, externalTokenHandler, pluginId, disableDefaultAuthPolicy, pluginKeySource) {
    this.userTokenHandler = userTokenHandler;
    this.pluginTokenHandler = pluginTokenHandler;
    this.externalTokenHandler = externalTokenHandler;
    this.pluginId = pluginId;
    this.disableDefaultAuthPolicy = disableDefaultAuthPolicy;
    this.pluginKeySource = pluginKeySource;
  }
  async authenticate(token, options) {
    const pluginResult = await this.pluginTokenHandler.verifyToken(token);
    if (pluginResult) {
      if (pluginResult.limitedUserToken) {
        const userResult2 = await this.userTokenHandler.verifyToken(
          pluginResult.limitedUserToken
        );
        if (!userResult2) {
          throw new errors.AuthenticationError(
            "Invalid user token in plugin token obo claim"
          );
        }
        return helpers.createCredentialsWithUserPrincipal(
          userResult2.userEntityRef,
          pluginResult.limitedUserToken,
          this.#getJwtExpiration(pluginResult.limitedUserToken),
          pluginResult.subject
        );
      }
      return helpers.createCredentialsWithServicePrincipal(pluginResult.subject);
    }
    const userResult = await this.userTokenHandler.verifyToken(token);
    if (userResult) {
      if (!options?.allowLimitedAccess && this.userTokenHandler.isLimitedUserToken(token)) {
        throw new errors.AuthenticationError("Illegal limited user token");
      }
      return helpers.createCredentialsWithUserPrincipal(
        userResult.userEntityRef,
        token,
        this.#getJwtExpiration(token)
      );
    }
    const externalResult = await this.externalTokenHandler.verifyToken(token);
    if (externalResult) {
      return helpers.createCredentialsWithServicePrincipal(
        externalResult.subject,
        void 0,
        externalResult.accessRestrictions
      );
    }
    throw new errors.AuthenticationError("Illegal token");
  }
  isPrincipal(credentials, type) {
    const principal = credentials.principal;
    if (type === "unknown") {
      return true;
    }
    if (principal.type !== type) {
      return false;
    }
    return true;
  }
  async getNoneCredentials() {
    return helpers.createCredentialsWithNonePrincipal();
  }
  async getOwnServiceCredentials() {
    return helpers.createCredentialsWithServicePrincipal(`plugin:${this.pluginId}`);
  }
  async getPluginRequestToken(options) {
    const { targetPluginId } = options;
    const internalForward = helpers.toInternalBackstageCredentials(options.onBehalfOf);
    const { type } = internalForward.principal;
    if (type === "none" && this.disableDefaultAuthPolicy) {
      return { token: "" };
    }
    switch (type) {
      // TODO: Check whether the principal is ourselves
      case "service":
        return this.pluginTokenHandler.issueToken({
          pluginId: this.pluginId,
          targetPluginId
        });
      case "user": {
        const { token } = internalForward;
        if (!token) {
          throw new Error("User credentials is unexpectedly missing token");
        }
        const onBehalfOf = await this.userTokenHandler.createLimitedUserToken(
          token
        );
        return this.pluginTokenHandler.issueToken({
          pluginId: this.pluginId,
          targetPluginId,
          onBehalfOf: {
            limitedUserToken: onBehalfOf.token,
            expiresAt: onBehalfOf.expiresAt
          }
        });
      }
      default:
        throw new errors.AuthenticationError(
          `Refused to issue service token for credential type '${type}'`
        );
    }
  }
  async getLimitedUserToken(credentials) {
    const { token: backstageToken } = helpers.toInternalBackstageCredentials(credentials);
    if (!backstageToken) {
      throw new errors.AuthenticationError(
        "User credentials is unexpectedly missing token"
      );
    }
    return this.userTokenHandler.createLimitedUserToken(backstageToken);
  }
  async listPublicServiceKeys() {
    const { keys } = await this.pluginKeySource.listKeys();
    return { keys: keys.map(({ key }) => key) };
  }
  #getJwtExpiration(token) {
    const { exp } = jose.decodeJwt(token);
    if (!exp) {
      throw new errors.AuthenticationError("User token is missing expiration");
    }
    return new Date(exp * 1e3);
  }
}

exports.DefaultAuthService = DefaultAuthService;
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