chore: import upstream snapshot with attribution

pkg/checker/password.go

@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package checker
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+const (
+	levelD = iota
+	LevelC
+	LevelB
+	LevelA
+	LevelS
+)
+
+const (
+	PasswordCannotContainSpaces = "error.password.space_invalid"
+)
+
+// CheckPassword checks the password strength
+func CheckPassword(password string) error {
+	if strings.Contains(password, " ") {
+		return errors.New(PasswordCannotContainSpaces)
+	}
+
+	// TODO Currently there is no requirement for password strength
+	minLevel := 0
+
+	// The password strength level is initialized to D.
+	// The regular is used to verify the password strength.
+	// If the matching is successful, the password strength increases by 1
+	level := levelD
+	patternList := []string{`[0-9]+`, `[a-z]+`, `[A-Z]+`, `[~!@#$%^&*?_-]+`}
+	for _, pattern := range patternList {
+		match, _ := regexp.MatchString(pattern, password)
+		if match {
+			level++
+		}
+	}
+
+	// If the final password strength falls below the required minimum strength, return with an error
+	if level < minLevel {
+		return fmt.Errorf("the password does not satisfy the current policy requirements")
+	}
+	return nil
+}