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render.go
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render.go
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package render
import (
"errors"
"fmt"
"github.com/CloudyKit/jet/v6"
"github.com/alexedwards/scs/v2"
"github.com/justinas/nosurf"
"github.com/kataras/blocks"
"html/template"
"log"
"net/http"
"strings"
"time"
)
type Render struct {
Renderer string
RootPath string
Secure bool
Port string
ServerName string
JetViews *jet.Set
BlocksViews *blocks.Blocks
Session *scs.SessionManager
}
type TemplateData struct {
IsAuthenticated bool
IntMap map[string]int
StringMap map[string]string
FloatMap map[string]float64
Data map[string]interface{}
CSRFToken string
Port string
ServerName string
Secure bool
Error string
Flash string
}
func (r *Render) DefaultData(templateData *TemplateData, request *http.Request) *TemplateData {
templateData.Secure = r.Secure
templateData.ServerName = r.ServerName
templateData.Port = r.Port
templateData.CSRFToken = nosurf.Token(request)
if r.Session.Exists(request.Context(), "userID") {
templateData.IsAuthenticated = true
}
templateData.Error = r.Session.PopString(request.Context(), "error")
templateData.Flash = r.Session.PopString(request.Context(), "flash")
return templateData
}
// Page The page render function. You can use it to render pages using go or jet templates.
func (r *Render) Page(writer http.ResponseWriter, request *http.Request, view, layout string, variables, data interface{}) error {
switch strings.ToLower(r.Renderer) {
case "go":
return r.GoPage(writer, request, view, data)
case "jet":
return r.JetPage(writer, request, view, variables, data)
case "blocks":
data := data.(map[string]interface{})
return r.BlocksPage(writer, request, view, layout, nil, data)
default:
}
return errors.New("No rendering engine available. Please fill the required value (go or jet) in .env file ")
}
// GoPage The default go template engine renderer function.
func (r *Render) GoPage(writer http.ResponseWriter, request *http.Request, view string, data interface{}) error {
tmpl, err := template.ParseFiles(fmt.Sprintf("%s/views/%s.page.tmpl", r.RootPath, view))
if err != nil {
return err
}
td := &TemplateData{}
if data != nil {
td = data.(*TemplateData)
}
td = r.DefaultData(td, request)
err = tmpl.Execute(writer, &td)
if err != nil {
return err
}
return nil
}
//JetPage The jet engine template renderer function.
func (r *Render) JetPage(writer http.ResponseWriter, request *http.Request, view string, variables, data interface{}) error {
var vars jet.VarMap
if variables == nil {
vars = make(jet.VarMap)
} else {
vars = variables.(jet.VarMap)
}
td := &TemplateData{}
if data != nil {
td = data.(*TemplateData)
}
td = r.DefaultData(td, request)
t, err := r.JetViews.GetTemplate(fmt.Sprintf("%s.jet", view))
if err != nil {
log.Println(err)
return err
}
if err = t.Execute(writer, vars, td); err != nil {
log.Println(err)
return err
}
return nil
}
//BlocksPage The Blocks' engine template renderer function.
func (r *Render) BlocksPage(writer http.ResponseWriter, request *http.Request, view, layout string, variables interface{}, data map[string]interface{}) error {
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
r.BlocksViews = blocks.New("./views").
Reload(true).
Funcs(map[string]interface{}{
"year": func() int {
return time.Now().Year()
},
})
err := r.BlocksViews.Load()
if err != nil {
return err
}
td := &TemplateData{}
if data != nil {
data["data"] = r.DefaultData(td, request)
}
err = r.BlocksViews.ExecuteTemplate(writer, view, layout, data)
if err != nil {
return err
}
return nil
}