[+] User registration endpoint

src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt

@@ -0,0 +1,45 @@
+package icu.samnyan.aqua.net
+
+import ext.*
+import icu.samnyan.aqua.net.db.AquaNetUser
+import icu.samnyan.aqua.net.db.AquaNetUserRepo
+import icu.samnyan.aqua.net.utils.TurnstileService
+import io.ktor.client.request.*
+import jakarta.servlet.http.HttpServletRequest
+import org.springframework.security.crypto.password.PasswordEncoder
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("/api/v2/user")
+class UserRegistrar(
+    val userRepo: AquaNetUserRepo,
+    val hasher: PasswordEncoder,
+    val turnstileService: TurnstileService
+) {
+    /**
+     * Register a new user
+     */
+    @PostMapping("/register")
+    fun register(@RP email: Str, @RP pass: Str, @RP captcha: Str?, request: HttpServletRequest) {
+        request.ip
+
+        // Check captcha
+        if (!turnstileService.validate(captcha,
+
+        // Check if email is valid
+        if (!email.isValidEmail()) 400 > "Invalid email"
+
+        // Check if user with the same email exists
+        if (userRepo.existsByEmail(email)) 400 > "User already exists"
+
+        // Validate password
+        if (pass.length < 8) 400 > "Password too short"
+
+        val u = AquaNetUser(email = email, pwHash = hasher.encode(pass), regTime = millis(), lastLogin = millis())
+        userRepo.save(u)
+
+        200 > "User created"
+    }
+}