2016-11-04 06:16:01 +08:00
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// Copyright 2013 com authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package com
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"errors"
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r "math/rand"
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"strconv"
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"strings"
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"time"
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"unicode"
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"unicode/utf8"
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)
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2017-11-28 17:43:51 +08:00
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// AESGCMEncrypt encrypts plaintext with the given key using AES in GCM mode.
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func AESGCMEncrypt(key, plaintext []byte) ([]byte, error) {
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2016-11-04 06:16:01 +08:00
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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2017-11-28 17:43:51 +08:00
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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2016-11-04 06:16:01 +08:00
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return nil, err
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}
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2017-11-28 17:43:51 +08:00
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nonce := make([]byte, gcm.NonceSize())
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if _, err := rand.Read(nonce); err != nil {
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return nil, err
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}
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ciphertext := gcm.Seal(nil, nonce, plaintext, nil)
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return append(nonce, ciphertext...), nil
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2016-11-04 06:16:01 +08:00
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}
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2017-11-28 17:43:51 +08:00
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// AESGCMDecrypt decrypts ciphertext with the given key using AES in GCM mode.
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func AESGCMDecrypt(key, ciphertext []byte) ([]byte, error) {
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2016-11-04 06:16:01 +08:00
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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2017-11-28 17:43:51 +08:00
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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size := gcm.NonceSize()
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if len(ciphertext)-size <= 0 {
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return nil, errors.New("Ciphertext is empty")
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2016-11-04 06:16:01 +08:00
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}
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2017-11-28 17:43:51 +08:00
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nonce := ciphertext[:size]
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ciphertext = ciphertext[size:]
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plainText, err := gcm.Open(nil, nonce, ciphertext, nil)
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2016-11-04 06:16:01 +08:00
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if err != nil {
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return nil, err
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}
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2017-11-28 17:43:51 +08:00
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return plainText, nil
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2016-11-04 06:16:01 +08:00
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}
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// IsLetter returns true if the 'l' is an English letter.
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func IsLetter(l uint8) bool {
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n := (l | 0x20) - 'a'
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if n >= 0 && n < 26 {
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return true
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}
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return false
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}
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// Expand replaces {k} in template with match[k] or subs[atoi(k)] if k is not in match.
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func Expand(template string, match map[string]string, subs ...string) string {
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var p []byte
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var i int
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for {
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i = strings.Index(template, "{")
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if i < 0 {
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break
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}
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p = append(p, template[:i]...)
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template = template[i+1:]
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i = strings.Index(template, "}")
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if s, ok := match[template[:i]]; ok {
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p = append(p, s...)
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} else {
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j, _ := strconv.Atoi(template[:i])
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if j >= len(subs) {
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p = append(p, []byte("Missing")...)
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} else {
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p = append(p, subs[j]...)
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}
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}
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template = template[i+1:]
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}
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p = append(p, template...)
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return string(p)
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}
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// Reverse s string, support unicode
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func Reverse(s string) string {
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n := len(s)
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runes := make([]rune, n)
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for _, rune := range s {
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n--
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runes[n] = rune
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}
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return string(runes[n:])
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}
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// RandomCreateBytes generate random []byte by specify chars.
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func RandomCreateBytes(n int, alphabets ...byte) []byte {
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var bytes = make([]byte, n)
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var randby bool
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if num, err := rand.Read(bytes); num != n || err != nil {
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r.Seed(time.Now().UnixNano())
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randby = true
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}
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for i, b := range bytes {
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if len(alphabets) == 0 {
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if randby {
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bytes[i] = alphanum[r.Intn(len(alphanum))]
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} else {
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bytes[i] = alphanum[b%byte(len(alphanum))]
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}
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} else {
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if randby {
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bytes[i] = alphabets[r.Intn(len(alphabets))]
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} else {
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bytes[i] = alphabets[b%byte(len(alphabets))]
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}
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}
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}
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return bytes
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}
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// ToSnakeCase can convert all upper case characters in a string to
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// underscore format.
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//
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// Some samples.
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// "FirstName" => "first_name"
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// "HTTPServer" => "http_server"
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// "NoHTTPS" => "no_https"
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// "GO_PATH" => "go_path"
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// "GO PATH" => "go_path" // space is converted to underscore.
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// "GO-PATH" => "go_path" // hyphen is converted to underscore.
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//
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// From https://github.com/huandu/xstrings
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func ToSnakeCase(str string) string {
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if len(str) == 0 {
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return ""
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}
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buf := &bytes.Buffer{}
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var prev, r0, r1 rune
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var size int
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r0 = '_'
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for len(str) > 0 {
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prev = r0
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r0, size = utf8.DecodeRuneInString(str)
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str = str[size:]
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switch {
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case r0 == utf8.RuneError:
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buf.WriteByte(byte(str[0]))
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case unicode.IsUpper(r0):
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if prev != '_' {
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buf.WriteRune('_')
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}
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buf.WriteRune(unicode.ToLower(r0))
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if len(str) == 0 {
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break
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}
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r0, size = utf8.DecodeRuneInString(str)
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str = str[size:]
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if !unicode.IsUpper(r0) {
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buf.WriteRune(r0)
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break
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}
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// find next non-upper-case character and insert `_` properly.
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// it's designed to convert `HTTPServer` to `http_server`.
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// if there are more than 2 adjacent upper case characters in a word,
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// treat them as an abbreviation plus a normal word.
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for len(str) > 0 {
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r1 = r0
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r0, size = utf8.DecodeRuneInString(str)
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str = str[size:]
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if r0 == utf8.RuneError {
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buf.WriteRune(unicode.ToLower(r1))
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buf.WriteByte(byte(str[0]))
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break
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}
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if !unicode.IsUpper(r0) {
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if r0 == '_' || r0 == ' ' || r0 == '-' {
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r0 = '_'
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buf.WriteRune(unicode.ToLower(r1))
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} else {
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buf.WriteRune('_')
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buf.WriteRune(unicode.ToLower(r1))
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buf.WriteRune(r0)
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}
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break
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}
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buf.WriteRune(unicode.ToLower(r1))
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}
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if len(str) == 0 || r0 == '_' {
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buf.WriteRune(unicode.ToLower(r0))
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break
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}
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default:
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if r0 == ' ' || r0 == '-' {
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r0 = '_'
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}
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buf.WriteRune(r0)
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}
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}
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return buf.String()
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}
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