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|
package backend
import (
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"html/template"
"io"
"io/fs"
"log/slog"
"math/rand"
"net/http"
"regexp"
"strings"
)
var (
regexIsHttp = regexp.MustCompile(`^https?://`)
)
type dataUsable interface {
SetData(*data)
}
type data struct {
title string
Article bool
Domain string
URL string
Image string
Description string
Name string
Links []Link
Logo *Logo
Quote string
}
func (d *data) SetData(data *data) {
*d = *data
}
func (d *data) handleGeneric(w http.ResponseWriter, r *http.Request, name string, custom dataUsable) {
cfg := r.Context().Value(configKey).(*Config)
if d.Domain == "" {
d.Domain = cfg.Domain
}
if d.Name == "" {
d.Name = cfg.Name
}
if d.Description == "" {
d.Description = cfg.Description
}
if d.Links == nil {
d.Links = cfg.Links
}
if d.Logo == nil {
d.Logo = &cfg.Logo
}
if d.Quote == "" {
if cfg.Quotes == nil {
d.Quote = "Une citation"
} else {
d.Quote = cfg.Quotes[rand.Intn(len(cfg.Quotes))]
}
}
if d.Image == "" {
d.Image = cfg.DefaultImage
}
if d.URL == "" {
if !strings.HasPrefix(r.URL.Path, "/") {
r.URL.Path = "/" + r.URL.Path
}
d.URL = r.URL.Path
}
t, err := template.New("").Funcs(template.FuncMap{
"static": getStatic,
"fullStatic": func(path string) string {
if regexIsHttp.MatchString(path) {
return path
}
return fmt.Sprintf("https://%s/static/%s", cfg.Domain, path)
},
"asset": func(path string) *assetData {
return getAsset(r.Context(), path)
},
"next": func(i int) int { return i + 1 },
"before": func(i int) int { return i - 1 },
}).ParseFS(templates, "templates/components.html", fmt.Sprintf("templates/%s.html", name), "templates/base.html")
if err != nil {
panic(err)
}
exec := "base.html"
if r.Context().Value(isUpdateKey).(bool) {
exec = "body"
w.Header().Set("Updated-Title", d.Title())
w.Header().Set("Updated-Quote", d.Quote)
}
if custom == nil {
err = t.ExecuteTemplate(w, exec, d)
} else {
custom.SetData(d)
err = t.ExecuteTemplate(w, exec, custom)
}
if err != nil {
panic(err)
}
}
func (d *data) Title() string {
title := d.Name
if d.Article {
title += " - log entry"
}
if len(d.title) != 0 {
title += " - " + d.title
}
return title
}
func (d *data) PubDate() string {
return ""
}
func getStatic(path string) string {
if regexIsHttp.MatchString(path) {
return path
}
return fmt.Sprintf("/static/%s", path)
}
type assetData struct {
Src string
Checksum string
}
var assets = map[string]*assetData{}
func getAsset(ctx context.Context, path string) *assetData {
asset, ok := assets[path]
if ok && !ctx.Value(debugKey).(bool) {
return asset
}
asset = &assetData{}
var b []byte
if regexIsHttp.MatchString(path) {
asset.Src = path
resp, err := http.Get(path)
if err != nil {
slog.Warn("get remote asset", "error", err)
return asset
}
defer resp.Body.Close()
b, err = io.ReadAll(resp.Body)
if err != nil {
slog.Warn("read remote asset", "error", err)
return asset
}
} else {
asset.Src = fmt.Sprintf("/assets/%s", path)
aFS := ctx.Value(assetsFSKey).(fs.FS)
var err error
b, err = fs.ReadFile(aFS, path)
if err != nil {
slog.Warn("read asset", "error", err)
return asset
}
}
sum := sha256.Sum256(b)
checksum := base64.StdEncoding.EncodeToString(sum[:])
asset.Checksum = fmt.Sprintf("sha256-%s", checksum)
assets[path] = asset
return asset
}
|
