✨ Account validation endpoint

DysonNetwork.Pass/Account/AccountController.cs

@@ -34,7 +34,7 @@ public class AccountController(
             .Include(e => e.Badges)
             .Include(e => e.Profile)
             .Include(e => e.Contacts.Where(c => c.IsPublic))
-            .Where(a => a.Name == name)
+            .Where(a => EF.Functions.Like(a.Name, name))
             .FirstOrDefaultAsync();
         if (account is null) return NotFound(ApiError.NotFound(name, traceId: HttpContext.TraceIdentifier));
 
@@ -105,6 +105,44 @@ public class AccountController(
         [Required] public string CaptchaToken { get; set; } = string.Empty;
     }
 
+    public class AccountCreateValidateRequest
+    {
+        [Required]
+        [MinLength(2)]
+        [MaxLength(256)]
+        [RegularExpression(@"^[A-Za-z0-9_-]+$",
+            ErrorMessage = "Name can only contain letters, numbers, underscores, and hyphens.")
+        ]
+        public string? Name { get; set; }
+
+        [EmailAddress]
+        [RegularExpression(@"^[^+]+@[^@]+\.[^@]+$", ErrorMessage = "Email address cannot contain '+' symbol.")]
+        [Required]
+        [MaxLength(1024)]
+        public string? Email { get; set; }
+    }
+
+    [HttpPost("validate")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<string>> ValidateCreateAccountRequest(
+        [FromBody] AccountCreateValidateRequest request)
+    {
+        if (request.Name is not null)
+        {
+            if (await accounts.CheckAccountNameHasTaken(request.Name))
+                return BadRequest("Account name has already been taken.");
+        }
+
+        if (request.Email is not null)
+        {
+            if (await accounts.CheckEmailHasBeenUsed(request.Email))
+                return BadRequest("Email has already been used.");
+        }
+
+        return Ok("Everything seems good.");
+    }
+
     [HttpPost]
     [ProducesResponseType<SnAccount>(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]

DysonNetwork.Pass/Account/AccountService.cs

@@ -54,7 +54,7 @@ public class AccountService(
 
     public async Task<SnAccount?> LookupAccount(string probe)
     {
-        var account = await db.Accounts.Where(a => a.Name == probe).FirstOrDefaultAsync();
+        var account = await db.Accounts.Where(a => EF.Functions.ILike(a.Name, probe)).FirstOrDefaultAsync();
         if (account is not null) return account;
 
         var contact = await db.AccountContacts
@@ -81,6 +81,17 @@ public class AccountService(
         return profile?.Level;
     }
 
+    public async Task<bool> CheckAccountNameHasTaken(string name)
+    {
+        return await db.Accounts.AnyAsync(a => EF.Functions.ILike(a.Name, name));
+    }
+
+    public async Task<bool> CheckEmailHasBeenUsed(string email)
+    {
+        return await db.AccountContacts.AnyAsync(c =>
+            c.Type == Shared.Models.AccountContactType.Email && EF.Functions.ILike(c.Content, email));
+    }
+
     public async Task<SnAccount> CreateAccount(
         string name,
         string nick,
@@ -92,8 +103,7 @@ public class AccountService(
         bool isActivated = false
     )
     {
-        var dupeNameCount = await db.Accounts.Where(a => a.Name == name).CountAsync();
-        if (dupeNameCount > 0)
+        if (await CheckAccountNameHasTaken(name))
             throw new InvalidOperationException("Account name has already been taken.");
 
         var dupeEmailCount = await db.AccountContacts
@@ -274,7 +284,8 @@ public class AccountService(
         return isExists;
     }
 
-    public async Task<SnAccountAuthFactor?> CreateAuthFactor(SnAccount account, Shared.Models.AccountAuthFactorType type, string? secret)
+    public async Task<SnAccountAuthFactor?> CreateAuthFactor(SnAccount account,
+        Shared.Models.AccountAuthFactorType type, string? secret)
     {
         SnAccountAuthFactor? factor = null;
         switch (type)
@@ -352,7 +363,8 @@ public class AccountService(
     public async Task<SnAccountAuthFactor> EnableAuthFactor(SnAccountAuthFactor factor, string? code)
     {
         if (factor.EnabledAt is not null) throw new ArgumentException("The factor has been enabled.");
-        if (factor.Type is Shared.Models.AccountAuthFactorType.Password or Shared.Models.AccountAuthFactorType.TimedCode)
+        if (factor.Type is Shared.Models.AccountAuthFactorType.Password
+            or Shared.Models.AccountAuthFactorType.TimedCode)
         {
             if (code is null || !factor.VerifyPassword(code))
                 throw new InvalidOperationException(
@@ -577,7 +589,8 @@ public class AccountService(
             await cache.RemoveAsync($"{AuthService.AuthCachePrefix}{item.Id}");
     }
 
-    public async Task<SnAccountContact> CreateContactMethod(SnAccount account, Shared.Models.AccountContactType type, string content)
+    public async Task<SnAccountContact> CreateContactMethod(SnAccount account, Shared.Models.AccountContactType type,
+        string content)
     {
         var isExists = await db.AccountContacts
             .Where(x => x.AccountId == account.Id && x.Type == type && x.Content == content)
@@ -639,7 +652,8 @@ public class AccountService(
         }
     }
 
-    public async Task<SnAccountContact> SetContactMethodPublic(SnAccount account, SnAccountContact contact, bool isPublic)
+    public async Task<SnAccountContact> SetContactMethodPublic(SnAccount account, SnAccountContact contact,
+        bool isPublic)
     {
         contact.IsPublic = isPublic;
         db.AccountContacts.Update(contact);