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renderer.go
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renderer.go
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package renderer
import (
"errors"
"fmt"
"html/template"
"io"
"io/fs"
"log/slog"
"net/http"
"os"
"strings"
"github.com/Masterminds/sprig/v3"
"github.com/labstack/echo/v4"
"github.com/bdreece/melodeon/pkg/session"
"github.com/bdreece/melodeon/pkg/view"
)
const (
userKey string = "User"
tokenKey string = "Token"
nonceKey string = "Nonce"
)
var (
ErrParseTemplate = errors.New("failed to parse templates")
)
type Renderer struct {
tmpl *template.Template
sessions *session.Store
fs fs.FS
layouts map[string]string
log *slog.Logger
}
// Render implements echo.Renderer.
func (r *Renderer) Render(w io.Writer, name string, data any, c echo.Context) error {
t, err := r.tmpl.Clone()
if err != nil {
return fmt.Errorf("failed to clone templates: %w", err)
}
templates := r.evaulateTemplates(name)
t, err = t.ParseFS(r.fs, templates...)
if err != nil {
return errors.Join(ErrParseTemplate, err)
}
model, ok := data.(view.Model)
if !ok {
return t.ExecuteTemplate(w, name, data)
}
sess, err := r.sessions.Get(c, session.DefaultCookie)
if err != nil {
return echo.NewHTTPError(http.StatusInternalServerError)
}
if user := sess.User(); user != nil {
model[userKey] = user
}
if token := sess.Token(); token != nil {
model[tokenKey] = token
}
nonceSess, err := r.sessions.Get(c, session.NonceCookie)
if err != nil {
return echo.NewHTTPError(http.StatusInternalServerError)
}
if nonce := nonceSess.Nonce(); nonce != nil {
model[nonceKey] = *nonce
}
return t.ExecuteTemplate(w, name, model)
}
func (r Renderer) evaulateTemplates(name string) []string {
templates := []string{}
for prefix, layout := range r.layouts {
if strings.HasPrefix(name, prefix) {
templates = append(templates, layout)
}
}
return append(templates, name)
}
func New(store *session.Store, log *slog.Logger, opts *view.Options) (*Renderer, error) {
fs := os.DirFS(opts.TemplateDirectory)
tmpl, err := template.New("").
Funcs(sprig.FuncMap()).
ParseFS(fs, "*.gotmpl")
if err != nil {
return nil, errors.Join(ErrParseTemplate, err)
}
return &Renderer{tmpl, store, fs, opts.Layouts, log}, nil
}
var _ echo.Renderer = (*Renderer)(nil)