From 8e729e7539f47f682d74d11071ef5c86f89f0505 Mon Sep 17 00:00:00 2001
From: Drew DeVault <drew@ddevault.org>
Date: Thu, 6 Mar 2025 10:59:10 +0100
Subject: [PATCH] errors: new module for common GQL errors

This package provides a means of creating GraphQL-aware errors and
a location for common error codes.
---
 errors/errors.go | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 errors/errors.go

diff --git a/errors/errors.go b/errors/errors.go
new file mode 100644
index 0000000000000000000000000000000000000000..89bda63b273c29787d5803f405ecac1558df851f
--- /dev/null
+++ b/errors/errors.go
@@ -0,0 +1,42 @@
+package errors
+
+import (
+	"fmt"
+
+	"github.com/vektah/gqlparser/v2/gqlerror"
+)
+
+type ErrorCode string
+
+// Creates a new GraphQL error with a standard error code.
+func New(code ErrorCode, message string) *gqlerror.Error {
+	return &gqlerror.Error{
+		Message:    message,
+		Extensions: map[string]any{"code": code},
+	}
+}
+
+// Creates a new GraphQL error with a standard error code.
+func Errorf(code ErrorCode, format string, a ...any) *gqlerror.Error {
+	return &gqlerror.Error{
+		Message:    fmt.Sprintf(format, a...),
+		Extensions: map[string]any{"code": code},
+	}
+}
+
+// Sets the field name that caused the error
+func Field(err *gqlerror.Error, field string) {
+	err.Extensions["field"] = field
+}
+
+// Error codes as string constants
+var (
+	AccessDenied ErrorCode = "ERR_ACCESS_DENIED"
+	NotFound     ErrorCode = "ERR_NOT_FOUND"
+)
+
+// Error codes as Go errors
+var (
+	ErrAccessDenied = New(AccessDenied, "Access denied")
+	ErrNotFound     = New(NotFound, "Resource not found")
+)