Enforce email verification for password-based login + add resend verification endpoint

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Summary

Implements security enhancement to require email verification for password-based authentication while preserving social login functionality. Addresses security review item PR-2 by preventing unverified email addresses from obtaining API tokens via /api/v1/user/login.

Problem

Currently, users implementing MustVerifyEmail can still obtain API tokens via /api/v1/user/login even if email_verified_at is null. This weakens account integrity as unverified email addresses can be used immediately for API access.

Solution

1. Email Verification Enforcement

Modified LoginController::login() to check email verification status after successful credential authentication but before token issuance:

if ($this->attemptLogin($request)) {
    $user = $this->guard()->user();
    if ($user->password !== '' && !$user->hasVerifiedEmail()) {
        $this->guard()->logout();
        return $this->responseError('Email not verified', 403, ['error' => 'email_not_verified']);
    }
    return $this->sendLoginResponse($request);
}

Key Design Decisions:

• Uses strict check $user->password !== '' to exclude social accounts with empty passwords
• Only affects password-based login; social login flows (WeChat/WeApp) remain unchanged
• Returns consistent 403 error with error: 'email_not_verified' identifier for client handling

2. Resend Verification Endpoint

Added authenticated endpoint POST /api/v1/user/email/resend:

Route::post('/email/resend', function (\Illuminate\Http\Request $request) {
    $user = $request->user();
    if ($user->hasVerifiedEmail()) {
        return response()->json(['message' => 'already_verified']);
    }
    $user->sendEmailVerificationNotification();
    return response()->json(['message' => 'verification_link_sent']);
})->name('email-resend');

3. Response Helper Method

Added responseError() method to base Controller for consistent error responses:

public function responseError($message = null, int $httpCode = 500, $data = []) {
    return response()->json([
        'message' => $message ?? 'An error occurred',
        'data' => $data
    ], $httpCode);
}

Testing

Comprehensive test coverage includes:

• ✅ Blocking unverified users with passwords (403 error)
• ✅ Allowing verified users with passwords
• ✅ Allowing social users with empty passwords (no verification required)
• ✅ Resend verification for verified users (already_verified)
• ✅ Resend verification for unverified users (verification_link_sent)

Backward Compatibility

• No breaking changes for existing verified users
• No impact on social login flows (WeChat/WeApp controllers unaffected)
• No schema changes required
• Existing unverified password users will receive 403 until they verify (intended behavior per security policy)

Dependencies

Leverages existing Laravel infrastructure:

• User model already implements MustVerifyEmail interface
• EventServiceProvider already configured with SendEmailVerificationNotification listener
• Uses built-in hasVerifiedEmail() and sendEmailVerificationNotification() methods

Documentation

Added docs/email-verification.md explaining the new behavior and API responses.

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Title: Enforce email verification for password-based login + add resend verification endpoint

Summary:
Implement security enhancement: password (email+password) login must require a verified email (email_verified_at not null). Social (WeChat / WeApp) logins remain unaffected. Add an authenticated endpoint to resend the verification email. Do not modify existing social login flows. Provide consistent error response when email is unverified. Include tests guidance (but actual test files may be added later if testing framework setup is complex). This addresses earlier security review item PR-2.

Details / Rationale:
Currently, users implementing MustVerifyEmail can still obtain API tokens via /api/v1/user/login even if email_verified_at is null. This weakens account integrity (unverified addresses can be used immediately). We enforce verification post successful credential authentication but prior to issuing the new token. Social accounts (which may have blank password field) should continue to function without requiring email verification.

Changes Required:

1. app/Http/Controllers/API/LoginController.php

   • In login() method: after attemptLogin succeeds and before sendLoginResponse, insert check:
     if ($user->password && !$user->hasVerifiedEmail()) { logout and return 403 JSON error }
   • Provide error payload that includes an identifier (error: 'email_not_verified'). Utilize existing response helper (responseError or responseFail) if available; else return standard JSON structure similar to responseSuccess.

   Pseudocode:
   if ($this->attemptLogin($request)) {
   $user = $this->guard()->user();
   if ($user->password && !$user->hasVerifiedEmail()) {
   $this->guard()->logout();
   return $this->responseError('Email not verified', 403, ['error' => 'email_not_verified']);
   }
   return $this->sendLoginResponse($request);
   }

   If responseError signature differs, adapt accordingly. If no helper, fallback to:
   return response()->json(['message' => 'Email not verified', 'error' => 'email_not_verified'], 403);

2. routes/api.php

   • Add a new POST route: /api/v1/user/email/resend (protected by auth:api)
     Route implementation:
     • If verified: return {"message":"already_verified"}
     • Else send verification notification via $user->sendEmailVerificationNotification() and return {"message":"verification_link_sent"}
   • Ensure Request is imported (use Illuminate\Http\Request) if using closure.

3. Ensure that EventServiceProvider already registers the Registered event listener for SendEmailVerificationNotification (if missing, add). If already present, no change required.

4. (Optional small doc) Update README or create docs/email-verification.md referencing: 403 error on /api/v1/user/login means email_not_verified, call resend endpoint then visit email link.

5. Do NOT alter social login controllers (LoginWeAppController, LoginWechatController). They should continue to generate tokens regardless of email verification status. The condition user->password ensures empty password accounts (social) are skipped.

6. Code Style: Follow existing PHP style. Keep naming consistent. Avoid changing unrelated formatting.

7. Backwards Compatibility / Migration:

   • No schema changes. Existing unverified users who relied on password login will now receive 403 until they verify. This is intended per policy update.

8. Testing Guidance (not necessarily implemented in this PR if test suite setup is heavy):

   • Create a user with email_verified_at null -> login returns 403 + error=email_not_verified.
   • Mark email_verified_at=now() -> login returns 200 + access_token.
   • Authenticated unverified user POST /api/v1/user/email/resend returns verification_link_sent.
   • Authenticated verified user calling resend returns already_verified.

Edge Cases Considered:

• Users with a stored hashed password but email_verified_at null.
• Social accounts with empty password string (the condition $user->password checks non-empty string; if empty but not null, we still skip). If repository stores blank string, condition will evaluate truthy; we assume social accounts use ""; to be safe we might refine condition to strlen($user->password) > 0.
  Implement condition using: if ($user->password !== '' && !$user->hasVerifiedEmail())

Implementation Note:

• Use strict check for non-empty password to avoid blocking social accounts inadvertently.

Please implement these changes in a new branch and open a PR targeting master.

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