Add the sprig functions in the template engine

provider/provider.go

@@ -12,6 +12,7 @@ import (
 	"unicode"
 
 	"github.com/BurntSushi/toml"
+	"github.com/Masterminds/sprig"
 	"github.com/containous/traefik/autogen"
 	"github.com/containous/traefik/log"
 	"github.com/containous/traefik/safe"
@@ -59,14 +60,12 @@ func (p *BaseProvider) GetConfiguration(defaultTemplateFile string, funcMap temp
 		err error
 	)
 	configuration := new(types.Configuration)
-	var defaultFuncMap = template.FuncMap{
-		"replace":   Replace,
-		"tolower":   strings.ToLower,
-		"normalize": Normalize,
-		"split":     split,
-		"contains":  contains,
-	}
 
+	var defaultFuncMap = sprig.TxtFuncMap()
+	// tolower is deprecated in favor of sprig's lower function
+	defaultFuncMap["tolower"] = strings.ToLower
+	defaultFuncMap["normalize"] = Normalize
+	defaultFuncMap["split"] = split
 	for funcID, funcElement := range funcMap {
 		defaultFuncMap[funcID] = funcElement
 	}
@@ -102,15 +101,6 @@ func (p *BaseProvider) GetConfiguration(defaultTemplateFile string, funcMap temp
 	return configuration, nil
 }
 
-// Replace is an alias for strings.Replace
-func Replace(s1 string, s2 string, s3 string) string {
-	return strings.Replace(s3, s1, s2, -1)
-}
-
-func contains(substr, s string) bool {
-	return strings.Contains(s, substr)
-}
-
 func split(sep, s string) []string {
 	return strings.Split(s, sep)
 }