const OIDCRelyingParty = require('@solid/oidc-rp')

const KVPFileStore = require('kvplus-files')

const COLLECTION_NAME = 'clients'

module.exports = class OIDCClientStore {

/**

* @constructor

*

* @param [options={}] {Object}

*

* @param [options.collectionName='clients'] {string}

*

* @param [options.backend] {KVPFileStore} Either pass in a backend store

* @param [options.path] {string} Or initialize the store from path.

*/

constructor (options = {}) {

this.collectionName = options.collectionName || COLLECTION_NAME

this.backend = options.backend ||

new KVPFileStore({

path: options.path,

collections: [ this.collectionName ]

})

this.backend.serialize = (client) => { return client.serialize() }

this.backend.deserialize = (data) => {

let result

try {

result = JSON.parse(data)

} catch (error) {

console.log(`Error parsing JSON at '${this.backend.path}', ` +

`collection '${this.collectionName}': `, error)

}

return result

}

}

del (client) {

if (!this.backend) {

return Promise.reject(new Error('Client store not configured'))

}

if (!client) {

return Promise.reject(new Error('Cannot delete null client'))

}

let issuer = encodeURIComponent(client.provider.url)

return this.backend.del(this.collectionName, issuer)

}

put (client) {

if (!this.backend) {

return Promise.reject(new Error('Client store not configured'))

}

if (!client) {

return Promise.reject(new Error('Cannot store null client'))

}

let issuer = encodeURIComponent(client.provider.url)

return this.backend.put(this.collectionName, issuer, client)

.then(() => {

return client

})

}

get (issuer) {

if (!this.backend) {

return Promise.reject(new Error('Client store not configured'))

}

issuer = encodeURIComponent(issuer)

return this.backend.get(this.collectionName, issuer)

.then(result => {

if (result) {

return OIDCRelyingParty.from(result)

}

return result

})

.catch(error => {

console.error('Error in clientStore.get() while loading a RelyingParty:',

error)

})

}

}