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/*
* Copyright (c) 2017-present Robert Jaros
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package pl.treksoft.kvision.remote
import kotlinx.coroutines.experimental.Deferred
import kotlinx.coroutines.experimental.asDeferred
import kotlinx.serialization.Serializable
import pl.treksoft.kvision.utils.obj
/**
* A security exception.
*/
class SecurityException(message: String) : Exception(message)
/**
* Username and password credentials.
*/
@Serializable
data class Credentials(val username: String? = null, val password: String? = null)
/**
* Pac4j form login dispatcher.
*/
class LoginService {
val loginAgent = CallAgent()
/**
* Login with Pac4j FormClient.
* @param credentials username and password credentials
*/
fun login(credentials: Credentials?): Deferred<Boolean> =
if (credentials?.username != null) {
loginAgent.remoteCall("callback?client_name=FormClient", obj {
this.username = credentials.username
this.password = credentials.password
}, HttpMethod.POST, "application/x-www-form-urlencoded").then { _: dynamic -> true }.asDeferred()
} else {
throw SecurityException("Credentials cannot be empty")
}
}
/**
* Pac4j form login dispatcher.
*/
@Suppress("EXPERIMENTAL_FEATURE_WARNING")
abstract class SecurityMgr {
private var isLoggedIn = false
/**
* Executes given block of code after successful authentication.
* @param block a block of code
*/
@Suppress("NestedBlockDepth", "TooGenericExceptionCaught")
suspend fun <T> withAuth(block: suspend () -> T): T {
return try {
block().also {
if (!isLoggedIn) {
isLoggedIn = true
afterLogin()
}
}
} catch (e: Exception) {
if (e is SecurityException || !isLoggedIn) {
afterError()
isLoggedIn = false
while (!isLoggedIn) {
try {
login()
isLoggedIn = true
afterLogin()
} catch (e: Throwable) {
console.log(e)
}
}
block()
} else {
throw e
}
}
}
/**
* Login user.
* @return true if login is successful
* @throws SecurityException if login is not successful
*/
abstract suspend fun login(): Boolean
/**
* Method called after successful login.
*/
open suspend fun afterLogin() {}
/**
* Method called after error.
*/
open suspend fun afterError() {}
}
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