1 files changed, 162 insertions, 0 deletions
diff --git a/modules/web/middleware/binding.go b/modules/web/middleware/binding.go
new file mode 100644
index 0000000..8fa71a8
--- /dev/null
+++ b/modules/web/middleware/binding.go
@@ -0,0 +1,162 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"reflect"
+	"strings"
+
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/translation"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/modules/validation"
+
+	"gitea.com/go-chi/binding"
+)
+
+// Form form binding interface
+type Form interface {
+	binding.Validator
+}
+
+func init() {
+	binding.SetNameMapper(util.ToSnakeCase)
+}
+
+// AssignForm assign form values back to the template data.
+func AssignForm(form any, data map[string]any) {
+	typ := reflect.TypeOf(form)
+	val := reflect.ValueOf(form)
+
+	for typ.Kind() == reflect.Ptr {
+		typ = typ.Elem()
+		val = val.Elem()
+	}
+
+	for i := 0; i < typ.NumField(); i++ {
+		field := typ.Field(i)
+
+		fieldName := field.Tag.Get("form")
+		// Allow ignored fields in the struct
+		if fieldName == "-" {
+			continue
+		} else if len(fieldName) == 0 {
+			fieldName = util.ToSnakeCase(field.Name)
+		}
+
+		data[fieldName] = val.Field(i).Interface()
+	}
+}
+
+func getRuleBody(field reflect.StructField, prefix string) string {
+	for _, rule := range strings.Split(field.Tag.Get("binding"), ";") {
+		if strings.HasPrefix(rule, prefix) {
+			return rule[len(prefix) : len(rule)-1]
+		}
+	}
+	return ""
+}
+
+// GetSize get size int form tag
+func GetSize(field reflect.StructField) string {
+	return getRuleBody(field, "Size(")
+}
+
+// GetMinSize get minimal size in form tag
+func GetMinSize(field reflect.StructField) string {
+	return getRuleBody(field, "MinSize(")
+}
+
+// GetMaxSize get max size in form tag
+func GetMaxSize(field reflect.StructField) string {
+	return getRuleBody(field, "MaxSize(")
+}
+
+// GetInclude get include in form tag
+func GetInclude(field reflect.StructField) string {
+	return getRuleBody(field, "Include(")
+}
+
+// Validate populates the data with validation error (if any).
+func Validate(errs binding.Errors, data map[string]any, f any, l translation.Locale) binding.Errors {
+	if errs.Len() == 0 {
+		return errs
+	}
+
+	data["HasError"] = true
+	// If the field with name errs[0].FieldNames[0] is not found in form
+	// somehow, some code later on will panic on Data["ErrorMsg"].(string).
+	// So initialize it to some default.
+	data["ErrorMsg"] = l.Tr("form.unknown_error")
+	AssignForm(f, data)
+
+	typ := reflect.TypeOf(f)
+
+	if typ.Kind() == reflect.Ptr {
+		typ = typ.Elem()
+	}
+
+	if field, ok := typ.FieldByName(errs[0].FieldNames[0]); ok {
+		fieldName := field.Tag.Get("form")
+		if fieldName != "-" {
+			data["Err_"+field.Name] = true
+
+			trName := field.Tag.Get("locale")
+			if len(trName) == 0 {
+				trName = l.TrString("form." + field.Name)
+			} else {
+				trName = l.TrString(trName)
+			}
+
+			switch errs[0].Classification {
+			case binding.ERR_REQUIRED:
+				data["ErrorMsg"] = trName + l.TrString("form.require_error")
+			case binding.ERR_ALPHA_DASH:
+				data["ErrorMsg"] = trName + l.TrString("form.alpha_dash_error")
+			case binding.ERR_ALPHA_DASH_DOT:
+				data["ErrorMsg"] = trName + l.TrString("form.alpha_dash_dot_error")
+			case validation.ErrGitRefName:
+				data["ErrorMsg"] = trName + l.TrString("form.git_ref_name_error")
+			case binding.ERR_SIZE:
+				data["ErrorMsg"] = trName + l.TrString("form.size_error", GetSize(field))
+			case binding.ERR_MIN_SIZE:
+				data["ErrorMsg"] = trName + l.TrString("form.min_size_error", GetMinSize(field))
+			case binding.ERR_MAX_SIZE:
+				data["ErrorMsg"] = trName + l.TrString("form.max_size_error", GetMaxSize(field))
+			case binding.ERR_EMAIL:
+				data["ErrorMsg"] = trName + l.TrString("form.email_error")
+			case binding.ERR_URL:
+				data["ErrorMsg"] = trName + l.TrString("form.url_error", errs[0].Message)
+			case binding.ERR_INCLUDE:
+				data["ErrorMsg"] = trName + l.TrString("form.include_error", GetInclude(field))
+			case validation.ErrGlobPattern:
+				data["ErrorMsg"] = trName + l.TrString("form.glob_pattern_error", errs[0].Message)
+			case validation.ErrRegexPattern:
+				data["ErrorMsg"] = trName + l.TrString("form.regex_pattern_error", errs[0].Message)
+			case validation.ErrUsername:
+				if setting.Service.AllowDotsInUsernames {
+					data["ErrorMsg"] = trName + l.TrString("form.username_error")
+				} else {
+					data["ErrorMsg"] = trName + l.TrString("form.username_error_no_dots")
+				}
+			case validation.ErrInvalidGroupTeamMap:
+				data["ErrorMsg"] = trName + l.TrString("form.invalid_group_team_map_error", errs[0].Message)
+			default:
+				msg := errs[0].Classification
+				if msg != "" && errs[0].Message != "" {
+					msg += ": "
+				}
+
+				msg += errs[0].Message
+				if msg == "" {
+					msg = l.TrString("form.unknown_error")
+				}
+				data["ErrorMsg"] = trName + ": " + msg
+			}
+			return errs
+		}
+	}
+	return errs
+}