#1070 Clearer error message for illegal characters

models/error.go

@@ -8,6 +8,32 @@ import (
 	"fmt"
 )
 
+type ErrNameReserved struct {
+	Name string
+}
+
+func IsErrNameReserved(err error) bool {
+	_, ok := err.(ErrNameReserved)
+	return ok
+}
+
+func (err ErrNameReserved) Error() string {
+	return fmt.Sprintf("name is reserved: [name: %s]", err.Name)
+}
+
+type ErrNamePatternNotAllowed struct {
+	Pattern string
+}
+
+func IsErrNamePatternNotAllowed(err error) bool {
+	_, ok := err.(ErrNamePatternNotAllowed)
+	return ok
+}
+
+func (err ErrNamePatternNotAllowed) Error() string {
+	return fmt.Sprintf("name pattern is not allowed: [pattern: %s]", err.Pattern)
+}
+
 //  ____ ___
 // |    |   \______ ___________
 // |    |   /  ___// __ \_  __ \
@@ -15,6 +41,32 @@ import (
 // |______//____  >\___  >__|
 //              \/     \/
 
+type ErrUserAlreadyExist struct {
+	Name string
+}
+
+func IsErrUserAlreadyExist(err error) bool {
+	_, ok := err.(ErrUserAlreadyExist)
+	return ok
+}
+
+func (err ErrUserAlreadyExist) Error() string {
+	return fmt.Sprintf("user already exists: [name: %s]", err.Name)
+}
+
+type ErrEmailAlreadyUsed struct {
+	Email string
+}
+
+func IsErrEmailAlreadyUsed(err error) bool {
+	_, ok := err.(ErrEmailAlreadyUsed)
+	return ok
+}
+
+func (err ErrEmailAlreadyUsed) Error() string {
+	return fmt.Sprintf("e-mail has been used: [email: %s]", err.Email)
+}
+
 type ErrUserOwnRepos struct {
 	UID int64
 }