优化

auth/src/main/java/com/baiyue/auth/client/IamOnboardingClient.java

@@ -5,6 +5,7 @@ import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestHeader;
 
@@ -16,6 +17,11 @@ public interface IamOnboardingClient {
             @RequestHeader("X-Internal-Service-Token") String internalToken,
             @RequestBody OnboardingRequest request);
 
+    @GetMapping("/merchant-registrations/{authUserId}")
+    ApiResponse<OnboardingResponse> registration(
+            @RequestHeader("X-Internal-Service-Token") String internalToken,
+            @PathVariable("authUserId") Long authUserId);
+
     @DeleteMapping("/merchant-registrations/{authUserId}/compensation")
     ApiResponse<Void> compensate(
             @RequestHeader("X-Internal-Service-Token") String internalToken,

auth/src/main/java/com/baiyue/auth/dto/MerchantRegisterRequest.java

@@ -12,7 +12,7 @@ public record MerchantRegisterRequest(
         @NotBlank @Size(min = 8, max = 72) String password,
         @NotBlank @Size(max = 64) String displayName,
         @NotBlank @Size(max = 128) String companyName,
-        @NotBlank @Size(max = 64) String legalPerson,
+        @Size(max = 64) String legalPerson,
         @Schema(description = "首个企业管理员的登录手机号；注册时同时初始化企业联系电话，创建后两者独立维护")
         @NotBlank @Pattern(regexp = "^1[3-9]\\d{9}$") String phone,
         @Email @Size(max = 128) String contactEmail,

auth/src/main/java/com/baiyue/auth/service/MerchantRegistrationService.java

@@ -35,11 +35,20 @@ public class MerchantRegistrationService {
     @BusinessAudit(event = "MERCHANT_REGISTER", resourceType = "ACCOUNT",
         resourceId = "#request.username", description = "商户注册", captureAfter = false)
     public MerchantRegisterResponse register(MerchantRegisterRequest request) {
-        if (accountRepository.existsByUsername(request.username())) {
+        AuthAccount usernameAccount = accountRepository.findByUsername(request.username());
+        AuthAccount phoneAccount = accountRepository.findByPhone(request.phone());
+        if (usernameAccount != null && phoneAccount != null
+                && usernameAccount.getId().equals(phoneAccount.getId())
+                && "MERCHANT".equals(usernameAccount.getDefaultAppCode())
+                && "ACTIVE".equals(usernameAccount.getAccountStatus())
+                && passwordEncoder.matches(request.password(), usernameAccount.getPasswordHash())) {
+            return existingRegistration(usernameAccount);
+        }
+        if (usernameAccount != null) {
             throw new BizException(ResultCode.CONFLICT, "用户名已存在");
         }
-        if (accountRepository.existsByPhone(request.phone())) {
-            throw new BizException(ResultCode.CONFLICT, "手机号已存在");
+        if (phoneAccount != null) {
+            throw new BizException(ResultCode.CONFLICT, "该手机号已注册，请直接登录后继续完善企业资质");
         }
         long accountId = IdWorker.getId();
         String passwordHash = passwordEncoder.encode(request.password());
@@ -111,6 +120,24 @@ public class MerchantRegistrationService {
                 "LOGIN_AND_COMPLETE_QUALIFICATIONS");
     }
 
+    private MerchantRegisterResponse existingRegistration(AuthAccount account) {
+        try {
+            var response = onboardingClient.registration(internalToken, account.getId());
+            if (response == null || !response.successful() || response.data() == null) {
+                throw new BizException(ResultCode.SERVICE_UNAVAILABLE, "注册状态暂时无法确认，请直接登录后继续完善企业资质");
+            }
+            var onboarding = response.data();
+            if (!java.util.Set.of("PROFILE_REQUIRED", "REJECTED").contains(onboarding.tenantStatus())) {
+                throw new BizException(ResultCode.CONFLICT, "该账号已注册，请直接登录");
+            }
+            return new MerchantRegisterResponse(account.getId(), onboarding.tenantId(), onboarding.membershipId(),
+                    onboarding.tenantStatus(), onboarding.dimensionInitializationStatus(),
+                    "LOGIN_AND_COMPLETE_QUALIFICATIONS");
+        } catch (FeignException exception) {
+            throw new BizException(ResultCode.SERVICE_UNAVAILABLE, "注册状态暂时无法确认，请直接登录后继续完善企业资质");
+        }
+    }
+
     private void registerRollbackCompensation(long accountId, AtomicBoolean compensationCompleted) {
         if (!TransactionSynchronizationManager.isSynchronizationActive()) {
             return;

auth/src/test/java/com/baiyue/auth/service/MerchantRegistrationServiceTest.java

@@ -23,6 +23,7 @@ import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.never;
 
 @SpringJUnitConfig(MerchantRegistrationService.class)
 @TestPropertySource(properties = "baiyue.security.internal-service-token=internal-token")
@@ -61,6 +62,49 @@ class MerchantRegistrationServiceTest {
         assertEquals("PENDING", result.dimensionInitializationStatus());
     }
 
+    @Test
+    void exactIncompleteRegistrationRetryReturnsTheExistingRegistration() {
+        AuthAccount account = new AuthAccount();
+        account.setId(9001L);
+        account.setUsername("registered_owner");
+        account.setPhone("13800138000");
+        account.setPasswordHash("encoded-password");
+        account.setAccountStatus("ACTIVE");
+        account.setDefaultAppCode("MERCHANT");
+        when(accounts.findByUsername("registered_owner")).thenReturn(account);
+        when(accounts.findByPhone("13800138000")).thenReturn(account);
+        when(encoder.matches("Password123", "encoded-password")).thenReturn(true);
+        when(onboarding.registration("internal-token", 9001L)).thenReturn(ApiResponse.success(
+                new IamOnboardingClient.OnboardingResponse(10001L, 30001L, "PROFILE_REQUIRED", "READY")));
+
+        var result = service.register(new MerchantRegisterRequest(
+                "registered_owner", "Password123", "注册人", "测试企业", null,
+                "13800138000", "owner@example.com", "CN", "深圳市宝安区"));
+
+        assertEquals(9001L, result.accountId());
+        assertEquals(10001L, result.tenantId());
+        assertEquals("READY", result.dimensionInitializationStatus());
+        verify(onboarding, never()).register(eq("internal-token"), any());
+        verify(accounts, never()).insert(any());
+    }
+
+    @Test
+    void phoneOwnedByAnotherUsernameDirectsTheUserBackToLogin() {
+        AuthAccount account = new AuthAccount();
+        account.setId(9001L);
+        account.setUsername("registered_owner");
+        account.setPhone("13800138000");
+        when(accounts.findByPhone("13800138000")).thenReturn(account);
+
+        var failure = assertThrows(com.baiyue.common.core.exception.BizException.class,
+                () -> service.register(new MerchantRegisterRequest(
+                        "another_owner", "Password123", "注册人", "测试企业", null,
+                        "13800138000", "owner@example.com", "CN", "深圳市宝安区")));
+
+        assertEquals("该手机号已注册，请直接登录后继续完善企业资质", failure.getMessage());
+        verify(onboarding, never()).register(eq("internal-token"), any());
+    }
+
     @Test
     void failedAuthInsertCompensatesTheIamRegistration() {
         when(encoder.encode("Password123")).thenReturn("encoded-password");