fix: non-ascii project badges (resolve #357)

chore: locally generated badges (resolve #348)

utils/http.go

@@ -4,8 +4,24 @@ import (
 	"encoding/json"
 	"github.com/muety/wakapi/config"
 	"net/http"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
 )
 
+const (
+	cacheMaxAgePattern = `max-age=(\d+)`
+)
+
+var (
+	cacheMaxAgeRe *regexp.Regexp
+)
+
+func init() {
+	cacheMaxAgeRe = regexp.MustCompile(cacheMaxAgePattern)
+}
+
 func RespondJSON(w http.ResponseWriter, r *http.Request, status int, object interface{}) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(status)
@@ -13,3 +29,16 @@ func RespondJSON(w http.ResponseWriter, r *http.Request, status int, object inte
 		config.Log().Request(r).Error("error while writing json response: %v", err)
 	}
 }
+
+func IsNoCache(r *http.Request, cacheTtl time.Duration) bool {
+	cacheControl := r.Header.Get("cache-control")
+	if strings.Contains(cacheControl, "no-cache") {
+		return true
+	}
+	if match := cacheMaxAgeRe.FindStringSubmatch(cacheControl); match != nil && len(match) > 1 {
+		if maxAge, _ := strconv.Atoi(match[1]); time.Duration(maxAge)*time.Second <= cacheTtl {
+			return true
+		}
+	}
+	return false
+}