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string.go
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/
string.go
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// Copyright 2023 The casbin Authors. All Rights Reserved.
//
// Licensed 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 util
import (
"encoding/base64"
"errors"
"fmt"
"io/ioutil"
"math/rand"
"strconv"
"strings"
"time"
"github.com/google/uuid"
)
func IndexAt(s, sep string, n int) int {
idx := strings.Index(s[n:], sep)
if idx > -1 {
idx += n
}
return idx
}
func ParseInt(s string) int {
i, err := strconv.Atoi(s)
if err != nil {
panic(err)
}
return i
}
func ParseIntWithError(s string) (int, error) {
i, err := strconv.Atoi(s)
if err != nil {
return -1, err
}
if i < 0 {
return -1, errors.New("negative version number")
}
return i, nil
}
func ParseFloat(s string) float64 {
f, err := strconv.ParseFloat(s, 64)
if err != nil {
panic(err)
}
return f
}
func GetOwnerAndNameFromId(id string) (string, string) {
tokens := strings.Split(id, "/")
if len(tokens) != 2 {
panic(errors.New("GetOwnerAndNameFromId() error, wrong token count for ID: " + id))
}
return tokens[0], tokens[1]
}
func GetOwnerAndNameFromId3(id string) (string, string, string) {
tokens := strings.Split(id, "/")
if len(tokens) != 3 {
panic(errors.New("GetOwnerAndNameFromId3() error, wrong token count for ID: " + id))
}
return tokens[0], fmt.Sprintf("%s/%s", tokens[0], tokens[1]), tokens[2]
}
func GetOwnerAndNameFromId3New(id string) (string, string, string) {
tokens := strings.Split(id, "/")
if len(tokens) != 3 {
panic(errors.New("GetOwnerAndNameFromId3New() error, wrong token count for ID: " + id))
}
return tokens[0], tokens[1], tokens[2]
}
func GetIdFromOwnerAndName(owner string, name string) string {
return fmt.Sprintf("%s/%s", owner, name)
}
func GenerateId() string {
return uuid.NewString()
}
func ReadStringFromPath(path string) string {
data, err := ioutil.ReadFile(path)
if err != nil {
panic(err)
}
return string(data)
}
func WriteStringToPath(s string, path string) {
err := ioutil.WriteFile(path, []byte(s), 0o644)
if err != nil {
panic(err)
}
}
func ReadBytesFromPath(path string) []byte {
data, err := ioutil.ReadFile(path)
if err != nil {
panic(err)
}
return data
}
func WriteBytesToPath(b []byte, path string) {
err := ioutil.WriteFile(path, b, 0o644)
if err != nil {
panic(err)
}
}
func DecodeBase64(s string) string {
res, err := base64.StdEncoding.DecodeString(s)
if err != nil {
panic(err)
}
return string(res)
}
func GetRandomName() string {
rand.Seed(time.Now().UnixNano())
const charset = "0123456789abcdefghijklmnopqrstuvwxyz"
result := make([]byte, 6)
for i := range result {
result[i] = charset[rand.Intn(len(charset))]
}
return string(result)
}
func GetId(owner, name string) string {
if strings.Contains(name, "/") {
return name
}
return fmt.Sprintf("%s/%s", owner, name)
}