leon/scripts/generate-pkgs-endpoints.js

import dotenv from 'dotenv'
import fs from 'fs'
import path from 'path'

import log from '@/helpers/log'

import { langs } from '@@/core/langs.json'

dotenv.config()

/**
 * Generate packages endpoints script
 * Parse and convert packages configuration into a JSON file understandable by Fastify
 * to dynamically generate endpoints so packages can be accessible over HTTP
 */
export default () => new Promise(async (resolve, reject) => {
  const supportedMethods = ['DELETE', 'GET', 'HEAD', 'PATCH', 'POST', 'PUT', 'OPTIONS']
  const packagesDir = 'packages'
  const outputFile = '/core/pkgs-endpoints.json'
  const outputFilePath = path.join(__dirname, `..${outputFile}`)
  const lang = langs[process.env.LEON_LANG].short.toLowerCase().substr(0, 2)

  try {
    const packages = fs.readdirSync(packagesDir)
      .filter((entity) => fs.statSync(path.join(packagesDir, entity)).isDirectory())
    const finalObj = {
      endpoints: []
    }
    let isFileNeedToBeGenerated = true
    let pkgObj = { }

    // Check if a new routing generation is necessary
    if (fs.existsSync(outputFilePath)) {
      const mtimeEndpoints = fs.statSync(outputFilePath).mtime.getTime()

      for (let i = 0; i < packages.length; i += 1) {
        const pkg = packages[i]
        const fileInfo = fs.statSync(`${packagesDir}/${pkg}/data/expressions/${lang}.json`)
        const mtime = fileInfo.mtime.getTime()

        if (mtime > mtimeEndpoints) {
          break
        }

        if ((i + 1) === packages.length) {
          isFileNeedToBeGenerated = false
        }
      }
    }

    if (isFileNeedToBeGenerated) {
      log.info('Parsing packages configuration...')

      for (let i = 0; i < packages.length; i += 1) {
        const pkg = packages[i]

        pkgObj = JSON.parse(fs.readFileSync(`${packagesDir}/${pkg}/data/expressions/${lang}.json`, 'utf8'))

        const modules = Object.keys(pkgObj)
        for (let j = 0; j < modules.length; j += 1) {
          const module = modules[j]
          const actions = Object.keys(pkgObj[module])

          for (let k = 0; k < actions.length; k += 1) {
            const action = actions[k]
            const actionObj = pkgObj[module][action]
            const { entities, http_api } = actionObj // eslint-disable-line camelcase
            let finalMethod = entities || http_api?.entities ? 'POST' : 'GET'

            if (http_api?.method) {
              finalMethod = http_api.method.toUpperCase()
            }

            if (!supportedMethods.includes(finalMethod)) {
              reject(`The "${finalMethod}" HTTP method of the ${pkg}/${module}/${action} action is not supported`)
            }

            const endpoint = {
              method: finalMethod.toUpperCase(),
              route: `/p/${pkg}/${module}/${action}`,
              params: []
            }

            if (http_api?.timeout) {
              endpoint.timeout = http_api.timeout
            }
            if (entities) {
              endpoint.params = entities.map((entity) => entity.name)
            } else if (http_api?.entities) {
              endpoint.params = http_api.entities.map((entity) => entity.name)
            }

            finalObj.endpoints.push(endpoint)
          }
        }
      }

      log.info(`Writing ${outputFile} file...`)
      try {
        fs.writeFileSync(outputFilePath, JSON.stringify(finalObj, null, 2))
        log.success(`${outputFile} file generated`)
        resolve()
      } catch (e) {
        reject(`Failed to generate ${outputFile} file: ${e.message}`)
      }
    }
  } catch (e) {
    log.error(e.message)
    reject(e)
  }
})