diff --git a/src/main/java/ext/Ext.kt b/src/main/java/ext/Ext.kt
index 6aba3310..6df696da 100644
--- a/src/main/java/ext/Ext.kt
+++ b/src/main/java/ext/Ext.kt
@@ -1,7 +1,34 @@
 package ext
 
 import org.springframework.http.HttpStatus
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestHeader
+import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.server.ResponseStatusException
+import io.ktor.client.*
+import io.ktor.client.engine.cio.*
+import io.ktor.client.plugins.contentnegotiation.*
+import io.ktor.serialization.kotlinx.json.*
+
+typealias RP = RequestParam
+typealias RB = RequestBody
+typealias RH = RequestHeader
+typealias Str = String
+typealias Bool = Boolean
 
 // Make it easier to throw a ResponseStatusException
-operator fun HttpStatus.invoke(message: String? = null): Nothing = throw ResponseStatusException(this, message ?: this.reasonPhrase)
\ No newline at end of file
+operator fun HttpStatus.invoke(message: String? = null): Nothing = throw ResponseStatusException(this, message ?: this.reasonPhrase)
+operator fun Int.compareTo(message: String): Int = throw ResponseStatusException(HttpStatus.valueOf(this), message)
+
+// Email validation
+// https://www.baeldung.com/java-email-validation-regex
+val emailRegex = "^(?=.{1,64}@)[\\p{L}0-9_-]+(\\.[\\p{L}0-9_-]+)*@[^-][\\p{L}0-9-]+(\\.[\\p{L}0-9-]+)*(\\.[\\p{L}]{2,})$".toRegex()
+fun Str.isValidEmail(): Bool = emailRegex.matches(this)
+
+fun millis() = System.currentTimeMillis()
+
+val HTTP = HttpClient(CIO) {
+    install(ContentNegotiation) {
+        json()
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/icu/samnyan/aqua/api/controller/sega/game/maimai2/Maimai2New.kt b/src/main/java/icu/samnyan/aqua/api/controller/sega/game/maimai2/Maimai2New.kt
index c2023aee..6f5f59de 100644
--- a/src/main/java/icu/samnyan/aqua/api/controller/sega/game/maimai2/Maimai2New.kt
+++ b/src/main/java/icu/samnyan/aqua/api/controller/sega/game/maimai2/Maimai2New.kt
@@ -1,5 +1,6 @@
 package icu.samnyan.aqua.api.controller.sega.game.maimai2
 
+import ext.RP
 import ext.invoke
 import icu.samnyan.aqua.sega.maimai2.dao.userdata.UserDataRepository
 import icu.samnyan.aqua.sega.maimai2.dao.userdata.UserGeneralDataRepository
@@ -22,7 +23,7 @@ class Maimai2New(
     data class TrendOut(val date: String, val rating: Int, val plays: Int)
 
     @GetMapping("trend")
-    fun trend(@RequestParam userId: Long): List<TrendOut> {
+    fun trend(@RP userId: Long): List<TrendOut> {
         // O(n log n) sort
         val d = userPlaylogRepository.findByUser_Card_ExtId(userId).sortedBy { it.playDate }.toList()
 
@@ -44,7 +45,7 @@ class Maimai2New(
         97.0  to "S").map { (k, v) -> (k * 10000).toInt() to v }
 
     @GetMapping("user-summary")
-    fun userSummary(@RequestParam userId: Long): Map<String, Any> {
+    fun userSummary(@RP userId: Long): Map<String, Any> {
         // Summary values: total plays, player rating, server-wide ranking
         // number of each rank, max combo, number of full combo, number of all perfect
         val user = userDataRepository.findByCard_ExtId(userId).getOrNull() ?: NOT_FOUND()