github.com/kyma-incubator/compass/components/director@v0.0.0-20230623144113-d764f56ff805/pkg/normalizer/normalizer.go (about)

     1  /*
     2   * Copyright 2020 The Compass Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package normalizer
    18  
    19  import (
    20  	"regexp"
    21  	"strings"
    22  )
    23  
    24  // defaultNormalizationPrefix is a fixed string used as prefix during default normalization
    25  const defaultNormalizationPrefix = "mp-"
    26  
    27  // DefaultNormalizator missing godoc
    28  type DefaultNormalizator struct{}
    29  
    30  // Normalize is the default normalization function used as normalization function;
    31  // It attempts to validate if the input is already normalized so it doesn't apply normalization again.
    32  func (dn *DefaultNormalizator) Normalize(name string) string {
    33  	if dn.isNormalized(name) {
    34  		return name
    35  	}
    36  
    37  	prefixedName := defaultNormalizationPrefix + name
    38  	return dn.normalize(prefixedName)
    39  }
    40  
    41  func (dn *DefaultNormalizator) normalize(name string) string {
    42  	normalizedName := strings.ToLower(name)
    43  	normalizedName = regexp.MustCompile("[^-a-z0-9]").ReplaceAllString(normalizedName, "-")
    44  	normalizedName = regexp.MustCompile("-{2,}").ReplaceAllString(normalizedName, "-")
    45  	normalizedName = regexp.MustCompile("-$").ReplaceAllString(normalizedName, "")
    46  
    47  	return normalizedName
    48  }
    49  
    50  func (dn *DefaultNormalizator) isNormalized(name string) bool {
    51  	if !strings.HasPrefix(name, defaultNormalizationPrefix) {
    52  		return false
    53  	}
    54  	normalizedName := dn.normalize(name)
    55  	return name == normalizedName
    56  }