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src/modules/auth/auth-service.ts

@@ -0,0 +1,76 @@
+import { auth } from "@/auth";
+import {
+    ServiceInputSignUp,
+    ServiceInputSignIn,
+    ServiceOutputSignUp,
+    ServiceOutputSignIn
+} from "./auth-service-dto";
+
+/**
+ * Sign up a new user
+ * Calls better-auth's signUp.email with username support
+ */
+export async function serviceSignUp(dto: ServiceInputSignUp): Promise<ServiceOutputSignUp> {
+    try {
+        await auth.api.signUpEmail({
+            body: {
+                email: dto.email,
+                password: dto.password,
+                username: dto.username,
+                name: dto.name,
+            }
+        });
+
+        return {
+            success: true,
+            email: dto.email,
+            username: dto.username,
+        };
+    } catch (error) {
+        // better-auth handles duplicates and validation errors
+        return {
+            success: false,
+        };
+    }
+}
+
+/**
+ * Sign in user
+ * Uses better-auth's signIn.username for username-based authentication
+ */
+export async function serviceSignIn(dto: ServiceInputSignIn): Promise<ServiceOutputSignIn> {
+    try {
+        // Determine if identifier is email or username
+        const isEmail = /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(dto.identifier);
+
+        let session;
+
+        if (isEmail) {
+            // Use email sign in
+            session = await auth.api.signInEmail({
+                body: {
+                    email: dto.identifier,
+                    password: dto.password,
+                }
+            });
+        } else {
+            // Use username sign in (requires username plugin)
+            session = await auth.api.signInUsername({
+                body: {
+                    username: dto.identifier,
+                    password: dto.password,
+                }
+            });
+        }
+
+        return {
+            success: true,
+            sessionToken: session?.token,
+        };
+    } catch (error) {
+        // better-auth throws on invalid credentials
+        return {
+            success: false,
+        };
+    }
+}