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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"bytes"
"errors"
"fmt"
"html/template"
"io"
"path/filepath"
"reflect"
"sync/atomic"
"github.com/fsnotify/fsnotify"
"github.com/mattermost/mattermost-server/mlog"
"github.com/nicksnyder/go-i18n/i18n"
)
type HTMLTemplateWatcher struct {
templates atomic.Value
stop chan struct{}
stopped chan struct{}
}
func NewHTMLTemplateWatcher(directory string) (*HTMLTemplateWatcher, error) {
templatesDir, _ := FindDir(directory)
mlog.Debug(fmt.Sprintf("Parsing server templates at %v", templatesDir))
ret := &HTMLTemplateWatcher{
stop: make(chan struct{}),
stopped: make(chan struct{}),
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
if err = watcher.Add(templatesDir); err != nil {
return nil, err
}
if htmlTemplates, err := template.ParseGlob(filepath.Join(templatesDir, "*.html")); err != nil {
return nil, err
} else {
ret.templates.Store(htmlTemplates)
}
go func() {
defer close(ret.stopped)
defer watcher.Close()
for {
select {
case <-ret.stop:
return
case event := <-watcher.Events:
if event.Op&fsnotify.Write == fsnotify.Write {
mlog.Info(fmt.Sprintf("Re-parsing templates because of modified file %v", event.Name))
if htmlTemplates, err := template.ParseGlob(filepath.Join(templatesDir, "*.html")); err != nil {
mlog.Error(fmt.Sprintf("Failed to parse templates %v", err))
} else {
ret.templates.Store(htmlTemplates)
}
}
case err := <-watcher.Errors:
mlog.Error(fmt.Sprintf("Failed in directory watcher %s", err))
}
}
}()
return ret, nil
}
func (w *HTMLTemplateWatcher) Templates() *template.Template {
return w.templates.Load().(*template.Template)
}
func (w *HTMLTemplateWatcher) Close() {
close(w.stop)
<-w.stopped
}
type HTMLTemplate struct {
Templates *template.Template
TemplateName string
Props map[string]interface{}
Html map[string]template.HTML
}
func NewHTMLTemplate(templates *template.Template, templateName string) *HTMLTemplate {
return &HTMLTemplate{
Templates: templates,
TemplateName: templateName,
Props: make(map[string]interface{}),
Html: make(map[string]template.HTML),
}
}
func (t *HTMLTemplate) Render() string {
var text bytes.Buffer
t.RenderToWriter(&text)
return text.String()
}
func (t *HTMLTemplate) RenderToWriter(w io.Writer) error {
if t.Templates == nil {
return errors.New("no html templates")
}
if err := t.Templates.ExecuteTemplate(w, t.TemplateName, t); err != nil {
mlog.Error(fmt.Sprintf("Error rendering template %v err=%v", t.TemplateName, err))
return err
}
return nil
}
func TranslateAsHtml(t i18n.TranslateFunc, translationID string, args map[string]interface{}) template.HTML {
return template.HTML(t(translationID, escapeForHtml(args)))
}
func escapeForHtml(arg interface{}) interface{} {
switch typedArg := arg.(type) {
case string:
return template.HTMLEscapeString(typedArg)
case *string:
return template.HTMLEscapeString(*typedArg)
case map[string]interface{}:
safeArg := make(map[string]interface{}, len(typedArg))
for key, value := range typedArg {
safeArg[key] = escapeForHtml(value)
}
return safeArg
default:
mlog.Warn(fmt.Sprintf("Unable to escape value for HTML template %v of type %v", arg, reflect.ValueOf(arg).Type()))
return ""
}
}
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