botpress/lib/skills/index.js

The world's first CMS for bots. Easily create, manage and extend chatbots.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _lodash = require('lodash');

var _lodash2 = _interopRequireDefault(_lodash);

var _util = require('../util');

var _util2 = _interopRequireDefault(_util);

var _validator = require('../dialog/validator');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }

const SKILLS_PREFIX = 'skill-';
const SKILLS_PREFIX_REGEX = new RegExp('^' + SKILLS_PREFIX);

class SkillsManager {
  constructor({ logger }) {
    this._log = (level, msg) => {
      this.logger && this.logger[level] && this.logger[level](msg);
    };

    this.logger = logger;
    this._log('info', `[Skills] Initiated`);
  }

  registerSkillsFromModules(modules) {
    this._skills = modules.filter(mod => {
      const shortName = _util2.default.getModuleShortname(mod.name);
      return SKILLS_PREFIX_REGEX.test(shortName);
    }).reduce((acc, curr) => {
      const shortName = _util2.default.getModuleShortname(curr.name);
      if (!curr.handlers.generate) {
        this._log('warn', `Skill "${shortName}" has no flow generator ("generate" method exposed)`);
        return acc;
      }

      if (!_lodash2.default.isFunction(curr.handlers.generate)) {
        this._log('warn', `Skill "${shortName}" generator is not a valid function`);
        return acc;
      }

      acc[shortName] = curr.handlers.generate;
      return acc;
    }, {});

    this._log('info', `[Skills] Loaded ${_lodash2.default.keys(this._skills).length} skills`);
  }

  generateFlow(skillId, data) {
    var _this = this;

    return _asyncToGenerator(function* () {
      if (!_this._skills) {
        throw new Error("Skills haven't been initialized yet");
      }

      //vv Backward compatible with old skills, just making sure there's no @botpress or botpress-
      skillId = _util2.default.getModuleShortname(skillId);

      if (!SKILLS_PREFIX_REGEX.test(skillId)) {
        skillId = SKILLS_PREFIX + skillId;
      }

      const generator = _this._skills[skillId];
      if (!generator) {
        throw new Error(`Skill "${skillId}" not found`);
      }

      const generatedFlow = yield generator(data);
      const validationError = (0, _validator.validateFlowSchema)(generatedFlow.flow);

      if (validationError) {
        throw new Error(`Skill "${skillId}" generated an invalid flow: ${validationError}`);
      }

      if (!generatedFlow.transitions || !_lodash2.default.isArray(generatedFlow.transitions)) {
        throw new Error(`Skill "${skillId}" didn't generate valid "transitions"`);
      }

      return generatedFlow;
    })();
  }
}
exports.default = SkillsManager;
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