server-config.js

'use strict'

// This file should only be required by server.js. To simplify testing, config
// should be injected into other components needing it.

const url = require('url')
const envFlag = require('node-env-flag')

function envArray(envVar, defaultValue, delimiter) {
  delimiter = delimiter || ','
  if (envVar) {
    return envVar.split(delimiter)
  } else {
    return Array.isArray(defaultValue)
      ? defaultValue
      : defaultValue.split(delimiter)
  }
}

const isSecure = envFlag(process.env.HTTPS, false)
const port = +process.env.PORT || +process.argv[2] || (isSecure ? 443 : 80)
const address = process.env.BIND_ADDRESS || process.argv[3] || '::'
const baseUri = url.format({
  protocol: isSecure ? 'https' : 'http',
  hostname: address,
  port,
  pathname: '/',
})

// The base URI provides a suitable value for development. Production should
// configure this.
const allowedOrigin = envArray(
  process.env.ALLOWED_ORIGIN,
  baseUri.replace(/\/$/, ''),
  ','
)

const config = {
  bind: {
    port,
    address,
  },
  metrics: {
    prometheus: {
      enabled: envFlag(process.env.METRICS_PROMETHEUS_ENABLED, false),
      allowedIps: process.env.METRICS_PROMETHEUS_ALLOWED_IPS,
    },
  },
  ssl: {
    isSecure,
    key: process.env.HTTPS_KEY,
    cert: process.env.HTTPS_CRT,
  },
  baseUri,
  redirectUrl: process.env.REDIRECT_URI || process.env.INFOSITE,
  cors: {
    allowedOrigin,
  },
  persistence: {
    dir: process.env.PERSISTENCE_DIR || './private',
    redisUrl: process.env.REDIS_URL || process.env.REDISTOGO_URL,
  },
  services: {
    github: {
      baseUri: process.env.GITHUB_URL || 'https://api.github.com',
      debug: {
        enabled: envFlag(process.env.GITHUB_DEBUG_ENABLED, false),
        intervalSeconds:
          parseInt(process.env.GITHUB_DEBUG_INTERVAL_SECONDS) || 300,
      },
    },
    trace: envFlag(process.env.TRACE_SERVICES),
  },
  profiling: {
    makeBadge: envFlag(process.env.PROFILE_MAKE_BADGE),
  },
  cacheHeaders: {
    defaultCacheLengthSeconds:
      parseInt(process.env.BADGE_MAX_AGE_SECONDS) || 120,
  },
  rateLimit: envFlag(process.env.RATE_LIMIT, true),
  handleInternalErrors: envFlag(process.env.HANDLE_INTERNAL_ERRORS, true),
}

module.exports = config