CalDAV support (#15)

vendor/github.com/labstack/echo/middleware/middleware.go

@@ -1,13 +1,37 @@
 package middleware
 
-import "github.com/labstack/echo"
+import (
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/labstack/echo"
+)
 
 type (
 	// Skipper defines a function to skip middleware. Returning true skips processing
 	// the middleware.
-	Skipper func(c echo.Context) bool
+	Skipper func(echo.Context) bool
+
+	// BeforeFunc defines a function which is executed just before the middleware.
+	BeforeFunc func(echo.Context)
 )
 
+func captureTokens(pattern *regexp.Regexp, input string) *strings.Replacer {
+	groups := pattern.FindAllStringSubmatch(input, -1)
+	if groups == nil {
+		return nil
+	}
+	values := groups[0][1:]
+	replace := make([]string, 2*len(values))
+	for i, v := range values {
+		j := 2 * i
+		replace[j] = "$" + strconv.Itoa(i+1)
+		replace[j+1] = v
+	}
+	return strings.NewReplacer(replace...)
+}
+
 // DefaultSkipper returns false which processes the middleware.
 func DefaultSkipper(echo.Context) bool {
 	return false