eecs448-project-4/app/routing/middleware/util/Config.middleware.js

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2020-11-01 18:50:03 +00:00
const { Middleware } = require('libflitter')
/*
* Config Middleware
* -------------------------------------------------------------
* Checks the specified configuration key (and optionally the value).
* If the configuration matches the required value, the request can
* proceed. Otherwise, a 404 will be returned.
*
* To use, add the call to your route's middleware:
*
* ['middleware::util:Config', {key: 'server.ssl.test', value: true}],
*
* In this case, the request would be allowed to proceed in the case:
* services.configs.get('server.ssl.test') === true
*
* The 'value' attribute is optional. If none is provided, the request
* can proceed if the config value is truthy.
*/
class Config extends Middleware {
static get services() {
return [...super.services, 'configs', 'output']
}
/*
* Run the middleware test.
*/
test(req, res, next, args = {}){
if ( !args.key ) return res.error(500)
const config = this.configs.get(args.key)
if ( !args.value && !config ) {
if ( !config && typeof config === 'undefined' )
this.output.warn(`util:Config middleware check failed because it tried to access a config that doesn't exist. (${key})`)
return res.error(404)
}
else if ( args.value && args.value !== config ) return res.error(404)
else return next()
}
}
module.exports = Config