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package koushin
import (
"fmt"
"html/template"
"io"
"io/ioutil"
"os"
"github.com/labstack/echo/v4"
)
const themesDir = "themes"
// GlobalRenderData contains data available in all templates.
type GlobalRenderData struct {
LoggedIn bool
// if logged in
Username string
// TODO: list of mailboxes
// additional plugin-specific data
Extra map[string]interface{}
}
// BaseRenderData is the base type for templates. It should be extended with
// additional template-specific fields:
//
// type MyRenderData struct {
// BaseRenderData
// // add additional fields here
// }
type BaseRenderData struct {
GlobalData GlobalRenderData
// additional plugin-specific data
Extra map[string]interface{}
}
// Global implements RenderData.
func (brd *BaseRenderData) Global() *GlobalRenderData {
return &brd.GlobalData
}
// RenderData is implemented by template data structs. It can be used to inject
// additional data to all templates.
type RenderData interface {
// GlobalData returns a pointer to the global render data.
Global() *GlobalRenderData
}
// NewBaseRenderData initializes a new BaseRenderData.
//
// It can be used by routes to pre-fill the base data:
//
// type MyRenderData struct {
// BaseRenderData
// // add additional fields here
// }
//
// data := &MyRenderData{
// BaseRenderData: *koushin.NewBaseRenderData(ctx),
// // other fields...
// }
func NewBaseRenderData(ctx *Context) *BaseRenderData {
global := GlobalRenderData{Extra: make(map[string]interface{})}
if ctx.Session != nil {
global.LoggedIn = true
global.Username = ctx.Session.username
}
return &BaseRenderData{
GlobalData: global,
Extra: make(map[string]interface{}),
}
}
type renderer struct {
base *template.Template
themes map[string]*template.Template
defaultTheme string
}
func (r *renderer) Render(w io.Writer, name string, data interface{}, ectx echo.Context) error {
// ectx is the raw *echo.context, not our own *Context
ctx := ectx.Get("context").(*Context)
for _, plugin := range ctx.Server.Plugins {
if err := plugin.Inject(ctx, name, data.(RenderData)); err != nil {
return fmt.Errorf("failed to run plugin '%v': %v", plugin.Name(), err)
}
}
// TODO: per-user theme selection
t := r.base
if r.defaultTheme != "" {
t = r.themes[r.defaultTheme]
}
return t.ExecuteTemplate(w, name, data)
}
func loadTheme(name string, base *template.Template) (*template.Template, error) {
theme, err := base.Clone()
if err != nil {
return nil, err
}
theme, err = theme.ParseGlob(themesDir + "/" + name + "/*.html")
if err != nil {
return nil, err
}
return theme, nil
}
func loadTemplates(logger echo.Logger, defaultTheme string, plugins []Plugin) (*renderer, error) {
base := template.New("")
for _, p := range plugins {
if err := p.LoadTemplate(base); err != nil {
return nil, fmt.Errorf("failed to load template for plugin '%v': %v", p.Name(), err)
}
}
themes := make(map[string]*template.Template)
files, err := ioutil.ReadDir(themesDir)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
for _, fi := range files {
if !fi.IsDir() {
continue
}
logger.Printf("Loading theme '%v'", fi.Name())
var err error
if themes[fi.Name()], err = loadTheme(fi.Name(), base); err != nil {
return nil, fmt.Errorf("failed to load theme '%v': %v", fi.Name(), err)
}
}
if defaultTheme != "" {
if _, ok := themes[defaultTheme]; !ok {
return nil, fmt.Errorf("failed to find default theme '%v'", defaultTheme)
}
}
return &renderer{
base: base,
themes: themes,
defaultTheme: defaultTheme,
}, nil
}
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