Manage errors

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/coredata/custom_domain.go

@@ -17,6 +17,7 @@ package coredata
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"maps"
 	"time"
@@ -25,6 +26,7 @@ import (
 	"github.com/getprobo/probo/pkg/gid"
 	"github.com/getprobo/probo/pkg/page"
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 	"go.gearno.de/kit/pg"
 )
 
@@ -49,8 +51,24 @@ type (
 	}
 
 	CustomDomains []*CustomDomain
+
+	ErrCustomDomainNotFound struct {
+		Identifier string
+	}
+
+	ErrCustomDomainAlreadyExists struct {
+		message string
+	}
 )
 
+func (e ErrCustomDomainNotFound) Error() string {
+	return fmt.Sprintf("custom domain not found: %q", e.Identifier)
+}
+
+func (e ErrCustomDomainAlreadyExists) Error() string {
+	return e.message
+}
+
 func NewCustomDomain(tenantID gid.TenantID, domain string) *CustomDomain {
 	now := time.Now()
 	return &CustomDomain{
@@ -357,6 +375,14 @@ INSERT INTO custom_domains (
 
 	_, err := conn.Exec(ctx, q, args)
 	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			if pgErr.Code == "23505" && pgErr.ConstraintName == "custom_domains_domain_key" {
+				return &ErrCustomDomainAlreadyExists{
+					message: fmt.Sprintf("custom domain with domain %q already exists", cd.Domain),
+				}
+			}
+		}
 		return fmt.Errorf("cannot insert custom domain: %w", err)
 	}