feat: ログインユーザー取得部分を共通化

src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/security/LoginUserContextHolder.kt

@@ -0,0 +1,5 @@
+package dev.usbharu.hideout.core.infrastructure.springframework.security
+
+interface LoginUserContextHolder {
+    fun getLoginUserId(): Long
+}

src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/security/OAuth2JwtLoginUserContextHolder.kt

@@ -0,0 +1,14 @@
+package dev.usbharu.hideout.core.infrastructure.springframework.security
+
+import org.springframework.security.core.context.SecurityContextHolder
+import org.springframework.security.oauth2.jwt.Jwt
+import org.springframework.stereotype.Component
+
+@Component
+class OAuth2JwtLoginUserContextHolder : LoginUserContextHolder {
+    override fun getLoginUserId(): Long {
+        val principal = SecurityContextHolder.getContext().getAuthentication().principal as Jwt
+
+        return principal.getClaim<String>("uid").toLong()
+    }
+}