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'use strict'
const path = require('path')
const Koa = require('koa')
const serve = require('koa-static')
const convert = require('koa-convert')
const serveIndex = require('koa-serve-index')
const morgan = require('koa-morgan')
const compress = require('koa-compress')
const streamLogStats = require('stream-log-stats')
const cors = require('kcors')
/**
* @module local-web-server
*/
module.exports = getApp
process.on('unhandledRejection', (reason, p) => {
throw reason
})
function getApp (options) {
options = Object.assign({
static: {},
serveIndex: {},
log: {},
compress: false
}, options)
const log = options.log
log.options = log.options || {}
const app = new Koa()
/* CORS: allow from any origin */
app.use(convert(cors()))
if (options.mime) {
app.use((ctx, next) => {
return next().then(() => {
const reqPathExtension = path.extname(ctx.path).slice(1)
Object.keys(options.mime).forEach(mimeType => {
const extsToOverride = options.mime[mimeType]
if (extsToOverride.indexOf(reqPathExtension) > -1) ctx.type = mimeType
})
})
})
}
if (options.compress) {
app.use(convert(compress()))
}
/* special case log formats */
if (log.format) {
if (log.format === 'none'){
log.format = undefined
} else if (log.format === 'logstalgia') {
morgan.token('date', logstalgiaDate)
log.format = 'combined'
}
/* if no specific log format was requested, show log stats */
} else {
log.format = 'common'
log.options.stream = streamLogStats({ refreshRate: 500 })
}
if (log.format) app.use(convert(morgan.middleware(log.format, log.options)))
if (options.static.root) {
app.use(convert(serve(options.static.root, options.static.options)))
}
if (options.serveIndex.path) {
app.use(convert(serveIndex(options.serveIndex.path, options.serveIndex.options)))
}
return app
}
function logstalgiaDate () {
var d = new Date()
return (`${d.getDate()}/${d.getUTCMonth()}/${d.getFullYear()}:${d.toTimeString()}`)
.replace('GMT', '')
.replace(' (BST)', '')
}