...

Source file src/github.com/GoogleCloudPlatform/k8s-config-connector/pkg/test/resourcefixture/variable/variables.go

Documentation: github.com/GoogleCloudPlatform/k8s-config-connector/pkg/test/resourcefixture/variable

     1  // Copyright 2022 Google LLC
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package testvariable
    16  
    17  import (
    18  	"crypto/rand"
    19  	"encoding/base64"
    20  	"fmt"
    21  	"log"
    22  	"regexp"
    23  	"strings"
    24  
    25  	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/randomid"
    26  )
    27  
    28  func NewUniqueId() string {
    29  	var id string
    30  	for i := 0; i < 3; i++ {
    31  		// generate a globally unique ID
    32  		id = randomid.New().String()
    33  		if isValidId(id) {
    34  			return id
    35  		}
    36  	}
    37  	panic(fmt.Sprintf("unable to generate a valid id, last attempt resulted in value: %v", id))
    38  }
    39  
    40  func isValidId(id string) bool {
    41  	// ssl and google are reserved words and cannot be used in project ids, a valid lookbehind regex would be
    42  	// "((?!ssl|google).*)", but golang does not support lookbehinds. For that reason, just throw out any id
    43  	// that contains these reserved words
    44  	return !strings.Contains(id, "google") && !strings.Contains(id, "ssl")
    45  }
    46  
    47  // RandomIdGenerator generates a randomized string of a given length and
    48  // contains only the characters defined in the given regex
    49  // the IDs returned by this are NOT globally unique so this should only be used in locations where there cannot be
    50  // collisions across tests
    51  func RandomIdGenerator(reg *regexp.Regexp, length uint) string {
    52  	var stringBuffer strings.Builder
    53  
    54  	// Keep generating and appending randomized characters until the length is hit
    55  	for uint(len(stringBuffer.String())) < length {
    56  		b := make([]byte, length*5) // Add more to account for filtering out unwanted chars
    57  		_, err := rand.Read(b)
    58  		if err != nil {
    59  			log.Fatalf("Could not read random bytes: %v", err)
    60  		}
    61  
    62  		s := base64.URLEncoding.EncodeToString(b)
    63  		allowedChars := reg.FindAllString(s, -1)
    64  		stringBuffer.WriteString(strings.Join(allowedChars, ""))
    65  	}
    66  	return stringBuffer.String()[0:length]
    67  }
    68  

View as plain text