6 files changed, 448 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
+}
diff --git a/modules/web/middleware/cookie.go b/modules/web/middleware/cookie.go
new file mode 100644
index 0000000..f2d25f5
--- /dev/null
+++ b/modules/web/middleware/cookie.go
@@ -0,0 +1,85 @@
+// Copyright 2020 The Macaron Authors
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/gitea/modules/session"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// SetRedirectToCookie convenience function to set the RedirectTo cookie consistently
+func SetRedirectToCookie(resp http.ResponseWriter, value string) {
+	SetSiteCookie(resp, "redirect_to", value, 0)
+}
+
+// DeleteRedirectToCookie convenience function to delete most cookies consistently
+func DeleteRedirectToCookie(resp http.ResponseWriter) {
+	SetSiteCookie(resp, "redirect_to", "", -1)
+}
+
+// GetSiteCookie returns given cookie value from request header.
+func GetSiteCookie(req *http.Request, name string) string {
+	cookie, err := req.Cookie(name)
+	if err != nil {
+		return ""
+	}
+	val, _ := url.QueryUnescape(cookie.Value)
+	return val
+}
+
+// SetSiteCookie returns given cookie value from request header.
+func SetSiteCookie(resp http.ResponseWriter, name, value string, maxAge int) {
+	// Previous versions would use a cookie path with a trailing /.
+	// These are more specific than cookies without a trailing /, so
+	// we need to delete these if they exist.
+	deleteLegacySiteCookie(resp, name)
+	cookie := &http.Cookie{
+		Name:     name,
+		Value:    url.QueryEscape(value),
+		MaxAge:   maxAge,
+		Path:     setting.SessionConfig.CookiePath,
+		Domain:   setting.SessionConfig.Domain,
+		Secure:   setting.SessionConfig.Secure,
+		HttpOnly: true,
+		SameSite: setting.SessionConfig.SameSite,
+	}
+	resp.Header().Add("Set-Cookie", cookie.String())
+}
+
+// deleteLegacySiteCookie deletes the cookie with the given name at the cookie
+// path with a trailing /, which would unintentionally override the cookie.
+func deleteLegacySiteCookie(resp http.ResponseWriter, name string) {
+	if setting.SessionConfig.CookiePath == "" || strings.HasSuffix(setting.SessionConfig.CookiePath, "/") {
+		// If the cookie path ends with /, no legacy cookies will take
+		// precedence, so do nothing.  The exception is that cookies with no
+		// path could override other cookies, but it's complicated and we don't
+		// currently handle that.
+		return
+	}
+
+	cookie := &http.Cookie{
+		Name:     name,
+		Value:    "",
+		MaxAge:   -1,
+		Path:     setting.SessionConfig.CookiePath + "/",
+		Domain:   setting.SessionConfig.Domain,
+		Secure:   setting.SessionConfig.Secure,
+		HttpOnly: true,
+		SameSite: setting.SessionConfig.SameSite,
+	}
+	resp.Header().Add("Set-Cookie", cookie.String())
+}
+
+func init() {
+	session.BeforeRegenerateSession = append(session.BeforeRegenerateSession, func(resp http.ResponseWriter, _ *http.Request) {
+		// Ensure that a cookie with a trailing slash does not take precedence over
+		// the cookie written by the middleware.
+		deleteLegacySiteCookie(resp, setting.SessionConfig.CookieName)
+	})
+}
diff --git a/modules/web/middleware/data.go b/modules/web/middleware/data.go
new file mode 100644
index 0000000..08d83f9
--- /dev/null
+++ b/modules/web/middleware/data.go
@@ -0,0 +1,63 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"context"
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// ContextDataStore represents a data store
+type ContextDataStore interface {
+	GetData() ContextData
+}
+
+type ContextData map[string]any
+
+func (ds ContextData) GetData() ContextData {
+	return ds
+}
+
+func (ds ContextData) MergeFrom(other ContextData) ContextData {
+	for k, v := range other {
+		ds[k] = v
+	}
+	return ds
+}
+
+const ContextDataKeySignedUser = "SignedUser"
+
+type contextDataKeyType struct{}
+
+var contextDataKey contextDataKeyType
+
+func WithContextData(c context.Context) context.Context {
+	return context.WithValue(c, contextDataKey, make(ContextData, 10))
+}
+
+func GetContextData(c context.Context) ContextData {
+	if ds, ok := c.Value(contextDataKey).(ContextData); ok {
+		return ds
+	}
+	return nil
+}
+
+func CommonTemplateContextData() ContextData {
+	return ContextData{
+		"IsLandingPageOrganizations": setting.LandingPageURL == setting.LandingPageOrganizations,
+
+		"ShowRegistrationButton":        setting.Service.ShowRegistrationButton,
+		"ShowMilestonesDashboardPage":   setting.Service.ShowMilestonesDashboardPage,
+		"ShowFooterVersion":             setting.Other.ShowFooterVersion,
+		"DisableDownloadSourceArchives": setting.Repository.DisableDownloadSourceArchives,
+
+		"EnableSwagger":      setting.API.EnableSwagger,
+		"EnableOpenIDSignIn": setting.Service.EnableOpenIDSignIn,
+		"PageStartTime":      time.Now(),
+
+		"RunModeIsProd": setting.IsProd,
+	}
+}
diff --git a/modules/web/middleware/flash.go b/modules/web/middleware/flash.go
new file mode 100644
index 0000000..88da204
--- /dev/null
+++ b/modules/web/middleware/flash.go
@@ -0,0 +1,65 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"fmt"
+	"html/template"
+	"net/url"
+)
+
+// Flash represents a one time data transfer between two requests.
+type Flash struct {
+	DataStore ContextDataStore
+	url.Values
+	ErrorMsg, WarningMsg, InfoMsg, SuccessMsg string
+}
+
+func (f *Flash) set(name, msg string, current ...bool) {
+	if f.Values == nil {
+		f.Values = make(map[string][]string)
+	}
+	showInCurrentPage := len(current) > 0 && current[0]
+	if showInCurrentPage {
+		// assign it to the context data, then the template can use ".Flash.XxxMsg" to render the message
+		f.DataStore.GetData()["Flash"] = f
+	} else {
+		// the message map will be saved into the cookie and be shown in next response (a new page response which decodes the cookie)
+		f.Set(name, msg)
+	}
+}
+
+func flashMsgStringOrHTML(msg any) string {
+	switch v := msg.(type) {
+	case string:
+		return v
+	case template.HTML:
+		return string(v)
+	}
+	panic(fmt.Sprintf("unknown type: %T", msg))
+}
+
+// Error sets error message
+func (f *Flash) Error(msg any, current ...bool) {
+	f.ErrorMsg = flashMsgStringOrHTML(msg)
+	f.set("error", f.ErrorMsg, current...)
+}
+
+// Warning sets warning message
+func (f *Flash) Warning(msg any, current ...bool) {
+	f.WarningMsg = flashMsgStringOrHTML(msg)
+	f.set("warning", f.WarningMsg, current...)
+}
+
+// Info sets info message
+func (f *Flash) Info(msg any, current ...bool) {
+	f.InfoMsg = flashMsgStringOrHTML(msg)
+	f.set("info", f.InfoMsg, current...)
+}
+
+// Success sets success message
+func (f *Flash) Success(msg any, current ...bool) {
+	f.SuccessMsg = flashMsgStringOrHTML(msg)
+	f.set("success", f.SuccessMsg, current...)
+}
diff --git a/modules/web/middleware/locale.go b/modules/web/middleware/locale.go
new file mode 100644
index 0000000..34a16f0
--- /dev/null
+++ b/modules/web/middleware/locale.go
@@ -0,0 +1,59 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/modules/translation"
+	"code.gitea.io/gitea/modules/translation/i18n"
+
+	"golang.org/x/text/language"
+)
+
+// Locale handle locale
+func Locale(resp http.ResponseWriter, req *http.Request) translation.Locale {
+	// 1. Check URL arguments.
+	lang := req.URL.Query().Get("lang")
+	changeLang := lang != ""
+
+	// 2. Get language information from cookies.
+	if len(lang) == 0 {
+		ck, _ := req.Cookie("lang")
+		if ck != nil {
+			lang = ck.Value
+		}
+	}
+
+	// Check again in case someone changes the supported language list.
+	if lang != "" && !i18n.DefaultLocales.HasLang(lang) {
+		lang = ""
+		changeLang = false
+	}
+
+	// 3. Get language information from 'Accept-Language'.
+	// The first element in the list is chosen to be the default language automatically.
+	if len(lang) == 0 {
+		tags, _, _ := language.ParseAcceptLanguage(req.Header.Get("Accept-Language"))
+		tag := translation.Match(tags...)
+		lang = tag.String()
+	}
+
+	if changeLang {
+		SetLocaleCookie(resp, lang, 1<<31-1)
+	}
+
+	return translation.NewLocale(lang)
+}
+
+// SetLocaleCookie convenience function to set the locale cookie consistently
+func SetLocaleCookie(resp http.ResponseWriter, lang string, maxAge int) {
+	SetSiteCookie(resp, "lang", lang, maxAge)
+}
+
+// DeleteLocaleCookie convenience function to delete the locale cookie consistently
+// Setting the lang cookie will trigger the middleware to reset the language to previous state.
+func DeleteLocaleCookie(resp http.ResponseWriter) {
+	SetSiteCookie(resp, "lang", "", -1)
+}
diff --git a/modules/web/middleware/request.go b/modules/web/middleware/request.go
new file mode 100644
index 0000000..0bb155d
--- /dev/null
+++ b/modules/web/middleware/request.go
@@ -0,0 +1,14 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+	"net/http"
+	"strings"
+)
+
+// IsAPIPath returns true if the specified URL is an API path
+func IsAPIPath(req *http.Request) bool {
+	return strings.HasPrefix(req.URL.Path, "/api/")
+}