Use gitea forked macaron (#7933)

Signed-off-by: Tamal Saha <tamal@appscode.com>

vendor/github.com/unknwon/com/string.go

@@ -0,0 +1,253 @@
+// Copyright 2013 com authors
+//
+// 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 com
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"errors"
+	r "math/rand"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+)
+
+// AESGCMEncrypt encrypts plaintext with the given key using AES in GCM mode.
+func AESGCMEncrypt(key, plaintext []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := rand.Read(nonce); err != nil {
+		return nil, err
+	}
+
+	ciphertext := gcm.Seal(nil, nonce, plaintext, nil)
+	return append(nonce, ciphertext...), nil
+}
+
+// AESGCMDecrypt decrypts ciphertext with the given key using AES in GCM mode.
+func AESGCMDecrypt(key, ciphertext []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	size := gcm.NonceSize()
+	if len(ciphertext)-size <= 0 {
+		return nil, errors.New("Ciphertext is empty")
+	}
+
+	nonce := ciphertext[:size]
+	ciphertext = ciphertext[size:]
+
+	plainText, err := gcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return plainText, nil
+}
+
+// IsLetter returns true if the 'l' is an English letter.
+func IsLetter(l uint8) bool {
+	n := (l | 0x20) - 'a'
+	if n >= 0 && n < 26 {
+		return true
+	}
+	return false
+}
+
+// Expand replaces {k} in template with match[k] or subs[atoi(k)] if k is not in match.
+func Expand(template string, match map[string]string, subs ...string) string {
+	var p []byte
+	var i int
+	for {
+		i = strings.Index(template, "{")
+		if i < 0 {
+			break
+		}
+		p = append(p, template[:i]...)
+		template = template[i+1:]
+		i = strings.Index(template, "}")
+		if s, ok := match[template[:i]]; ok {
+			p = append(p, s...)
+		} else {
+			j, _ := strconv.Atoi(template[:i])
+			if j >= len(subs) {
+				p = append(p, []byte("Missing")...)
+			} else {
+				p = append(p, subs[j]...)
+			}
+		}
+		template = template[i+1:]
+	}
+	p = append(p, template...)
+	return string(p)
+}
+
+// Reverse s string, support unicode
+func Reverse(s string) string {
+	n := len(s)
+	runes := make([]rune, n)
+	for _, rune := range s {
+		n--
+		runes[n] = rune
+	}
+	return string(runes[n:])
+}
+
+// RandomCreateBytes generate random []byte by specify chars.
+func RandomCreateBytes(n int, alphabets ...byte) []byte {
+	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	var bytes = make([]byte, n)
+	var randby bool
+	if num, err := rand.Read(bytes); num != n || err != nil {
+		r.Seed(time.Now().UnixNano())
+		randby = true
+	}
+	for i, b := range bytes {
+		if len(alphabets) == 0 {
+			if randby {
+				bytes[i] = alphanum[r.Intn(len(alphanum))]
+			} else {
+				bytes[i] = alphanum[b%byte(len(alphanum))]
+			}
+		} else {
+			if randby {
+				bytes[i] = alphabets[r.Intn(len(alphabets))]
+			} else {
+				bytes[i] = alphabets[b%byte(len(alphabets))]
+			}
+		}
+	}
+	return bytes
+}
+
+// ToSnakeCase can convert all upper case characters in a string to
+// underscore format.
+//
+// Some samples.
+//     "FirstName"  => "first_name"
+//     "HTTPServer" => "http_server"
+//     "NoHTTPS"    => "no_https"
+//     "GO_PATH"    => "go_path"
+//     "GO PATH"    => "go_path"      // space is converted to underscore.
+//     "GO-PATH"    => "go_path"      // hyphen is converted to underscore.
+//
+// From https://github.com/huandu/xstrings
+func ToSnakeCase(str string) string {
+	if len(str) == 0 {
+		return ""
+	}
+
+	buf := &bytes.Buffer{}
+	var prev, r0, r1 rune
+	var size int
+
+	r0 = '_'
+
+	for len(str) > 0 {
+		prev = r0
+		r0, size = utf8.DecodeRuneInString(str)
+		str = str[size:]
+
+		switch {
+		case r0 == utf8.RuneError:
+			buf.WriteByte(byte(str[0]))
+
+		case unicode.IsUpper(r0):
+			if prev != '_' {
+				buf.WriteRune('_')
+			}
+
+			buf.WriteRune(unicode.ToLower(r0))
+
+			if len(str) == 0 {
+				break
+			}
+
+			r0, size = utf8.DecodeRuneInString(str)
+			str = str[size:]
+
+			if !unicode.IsUpper(r0) {
+				buf.WriteRune(r0)
+				break
+			}
+
+			// find next non-upper-case character and insert `_` properly.
+			// it's designed to convert `HTTPServer` to `http_server`.
+			// if there are more than 2 adjacent upper case characters in a word,
+			// treat them as an abbreviation plus a normal word.
+			for len(str) > 0 {
+				r1 = r0
+				r0, size = utf8.DecodeRuneInString(str)
+				str = str[size:]
+
+				if r0 == utf8.RuneError {
+					buf.WriteRune(unicode.ToLower(r1))
+					buf.WriteByte(byte(str[0]))
+					break
+				}
+
+				if !unicode.IsUpper(r0) {
+					if r0 == '_' || r0 == ' ' || r0 == '-' {
+						r0 = '_'
+
+						buf.WriteRune(unicode.ToLower(r1))
+					} else {
+						buf.WriteRune('_')
+						buf.WriteRune(unicode.ToLower(r1))
+						buf.WriteRune(r0)
+					}
+
+					break
+				}
+
+				buf.WriteRune(unicode.ToLower(r1))
+			}
+
+			if len(str) == 0 || r0 == '_' {
+				buf.WriteRune(unicode.ToLower(r0))
+				break
+			}
+
+		default:
+			if r0 == ' ' || r0 == '-' {
+				r0 = '_'
+			}
+
+			buf.WriteRune(r0)
+		}
+	}
+
+	return buf.String()
+}