Dynamic Configuration Refactoring

middlewares/auth/auth.go

@@ -0,0 +1,65 @@
+package auth
+
+import (
+	"io/ioutil"
+	"strings"
+)
+
+// UserParser Parses a string and return a userName/userHash. An error if the format of the string is incorrect.
+type UserParser func(user string) (string, string, error)
+
+const (
+	defaultRealm        = "traefik"
+	authorizationHeader = "Authorization"
+)
+
+func getUsers(fileName string, appendUsers []string, parser UserParser) (map[string]string, error) {
+	users, err := loadUsers(fileName, appendUsers)
+	if err != nil {
+		return nil, err
+	}
+
+	userMap := make(map[string]string)
+	for _, user := range users {
+		userName, userHash, err := parser(user)
+		if err != nil {
+			return nil, err
+		}
+		userMap[userName] = userHash
+	}
+
+	return userMap, nil
+}
+
+func loadUsers(fileName string, appendUsers []string) ([]string, error) {
+	var users []string
+	var err error
+
+	if fileName != "" {
+		users, err = getLinesFromFile(fileName)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return append(users, appendUsers...), nil
+}
+
+func getLinesFromFile(filename string) ([]string, error) {
+	dat, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	// Trim lines and filter out blanks
+	rawLines := strings.Split(string(dat), "\n")
+	var filteredLines []string
+	for _, rawLine := range rawLines {
+		line := strings.TrimSpace(rawLine)
+		if line != "" {
+			filteredLines = append(filteredLines, line)
+		}
+	}
+
+	return filteredLines, nil
+}