Add JWT auth

api/src/auth/AuthenticationModule.kt

@@ -0,0 +1,21 @@
+package be.vandewalleh.auth
+
+import be.vandewalleh.kodein
+import io.ktor.application.Application
+import io.ktor.application.install
+import io.ktor.auth.Authentication
+import io.ktor.auth.UserIdPrincipal
+import io.ktor.auth.jwt.jwt
+import org.kodein.di.generic.instance
+
+fun Application.authenticationModule() {
+    install(Authentication) {
+        jwt {
+            val simpleJwt: SimpleJWT by kodein.instance()
+            verifier(simpleJwt.verifier)
+            validate {
+                UserIdPrincipal(it.payload.getClaim("name").asString())
+            }
+        }
+    }
+}

api/src/auth/SimpleJWT.kt

@@ -0,0 +1,19 @@
+package be.vandewalleh.auth
+
+import com.auth0.jwt.JWT
+import com.auth0.jwt.JWTVerifier
+import com.auth0.jwt.algorithms.Algorithm
+import java.util.*
+
+class SimpleJWT(secret: String) {
+    private val validityInMs = 36_000_00 * 1
+    private val algorithm = Algorithm.HMAC256(secret)
+
+    val verifier: JWTVerifier = JWT.require(algorithm).build()
+    fun sign(name: String): String = JWT.create()
+        .withClaim("name", name)
+        .withExpiresAt(getExpiration())
+        .sign(algorithm)
+
+    private fun getExpiration() = Date(System.currentTimeMillis() + validityInMs)
+}