added handle column to provide case insensitive constraint

net/server/internal/api_addAccount.go

@@ -80,6 +80,7 @@ func AddAccount(w http.ResponseWriter, r *http.Request) {
   // create new account
   account := store.Account{
     Username: username,
+    Handle: strings.ToLower(username),
     Password: password,
     Guid: fingerprint,
   }

net/server/internal/api_getAccountUsername.go

@@ -41,17 +41,27 @@ func GetAccountUsername(w http.ResponseWriter, r *http.Request) {
   }
 
   var accounts []accountUsername;
-  err := store.DB.Model(&store.Account{}).Where("username = ?", username).Find(&accounts).Error
-  if err != nil {
+  if err := store.DB.Model(&store.Account{}).Where("username = ?", username).Find(&accounts).Error; err != nil {
     LogMsg("failed to query accounts")
     w.WriteHeader(http.StatusInternalServerError)
     return
   }
-
-  if len(accounts) == 0 {
-    WriteResponse(w, true)
-  } else {
+  if len(accounts) != 0 {
     WriteResponse(w, false)
+    return
   }
+
+  handle := strings.ToLower(username);
+  if err := store.DB.Model(&store.Account{}).Where("handle = ?", handle).Find(&accounts).Error; err != nil {
+    LogMsg("failed to query accounts")
+    w.WriteHeader(http.StatusInternalServerError)
+    return
+  }
+  if len(accounts) != 0 {
+    WriteResponse(w, false)
+    return
+  }
+
+  WriteResponse(w, true)
 }
 

net/server/internal/api_setAccountAuthentication.go

@@ -2,6 +2,7 @@ package databag
 
 import (
   "errors"
+  "strings"
   "net/http"
   "gorm.io/gorm"
   "databag/internal/store"
@@ -26,6 +27,7 @@ func SetAccountAuthentication(w http.ResponseWriter, r *http.Request) {
   }
 
   token.Account.Username = username;
+  token.Account.Handle = strings.ToLower(username);
   token.Account.Password = password;
   err := store.DB.Transaction(func(tx *gorm.DB) error {
     if res := tx.Save(token.Account).Error; res != nil {

net/server/internal/store/schema.go

@@ -57,6 +57,7 @@ type Account struct {
   AccountDetailID   uint            `gorm:"not null"`
   Guid              string          `gorm:"not null;uniqueIndex"`
   Username          string          `gorm:"not null;uniqueIndex"`
+  Handle            string          `gorm:"uniqueIndex"`
   Password          []byte          `gorm:"not null"`
   AccountRevision   int64           `gorm:"not null;default:1"`
   ProfileRevision   int64           `gorm:"not null;default:1"`