forgejo-federation/modules/base/tool.go
2016-08-30 02:08:38 -07:00

531 lines
12 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package base
import (
"crypto/hmac"
"crypto/md5"
"crypto/rand"
"crypto/sha1"
"encoding/base64"
"encoding/hex"
"fmt"
"hash"
"html/template"
"math"
"net/http"
"strings"
"time"
"unicode"
"unicode/utf8"
"github.com/Unknwon/com"
"github.com/Unknwon/i18n"
"github.com/gogits/chardet"
"github.com/gogits/gogs/modules/log"
"github.com/gogits/gogs/modules/setting"
)
// EncodeMD5 encodes string to md5 hex value.
func EncodeMD5(str string) string {
m := md5.New()
m.Write([]byte(str))
return hex.EncodeToString(m.Sum(nil))
}
// Encode string to sha1 hex value.
func EncodeSha1(str string) string {
h := sha1.New()
h.Write([]byte(str))
return hex.EncodeToString(h.Sum(nil))
}
func ShortSha(sha1 string) string {
if len(sha1) > 10 {
return sha1[:10]
}
return sha1
}
func DetectEncoding(content []byte) (string, error) {
if utf8.Valid(content) {
log.Debug("Detected encoding: utf-8 (fast)")
return "UTF-8", nil
}
result, err := chardet.NewTextDetector().DetectBest(content)
if result.Charset != "UTF-8" && len(setting.Repository.AnsiCharset) > 0 {
log.Debug("Using default AnsiCharset: %s", setting.Repository.AnsiCharset)
return setting.Repository.AnsiCharset, err
}
log.Debug("Detected encoding: %s", result.Charset)
return result.Charset, err
}
func BasicAuthDecode(encoded string) (string, string, error) {
s, err := base64.StdEncoding.DecodeString(encoded)
if err != nil {
return "", "", err
}
auth := strings.SplitN(string(s), ":", 2)
return auth[0], auth[1], nil
}
func BasicAuthEncode(username, password string) string {
return base64.StdEncoding.EncodeToString([]byte(username + ":" + password))
}
// GetRandomString generate random string by specify chars.
func GetRandomString(n int, alphabets ...byte) string {
const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
var bytes = make([]byte, n)
rand.Read(bytes)
for i, b := range bytes {
if len(alphabets) == 0 {
bytes[i] = alphanum[b%byte(len(alphanum))]
} else {
bytes[i] = alphabets[b%byte(len(alphabets))]
}
}
return string(bytes)
}
// http://code.google.com/p/go/source/browse/pbkdf2/pbkdf2.go?repo=crypto
// FIXME: use https://godoc.org/golang.org/x/crypto/pbkdf2?
func PBKDF2(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
prf := hmac.New(h, password)
hashLen := prf.Size()
numBlocks := (keyLen + hashLen - 1) / hashLen
var buf [4]byte
dk := make([]byte, 0, numBlocks*hashLen)
U := make([]byte, hashLen)
for block := 1; block <= numBlocks; block++ {
// N.B.: || means concatenation, ^ means XOR
// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
// U_1 = PRF(password, salt || uint(i))
prf.Reset()
prf.Write(salt)
buf[0] = byte(block >> 24)
buf[1] = byte(block >> 16)
buf[2] = byte(block >> 8)
buf[3] = byte(block)
prf.Write(buf[:4])
dk = prf.Sum(dk)
T := dk[len(dk)-hashLen:]
copy(U, T)
// U_n = PRF(password, U_(n-1))
for n := 2; n <= iter; n++ {
prf.Reset()
prf.Write(U)
U = U[:0]
U = prf.Sum(U)
for x := range U {
T[x] ^= U[x]
}
}
}
return dk[:keyLen]
}
// verify time limit code
func VerifyTimeLimitCode(data string, minutes int, code string) bool {
if len(code) <= 18 {
return false
}
// split code
start := code[:12]
lives := code[12:18]
if d, err := com.StrTo(lives).Int(); err == nil {
minutes = d
}
// right active code
retCode := CreateTimeLimitCode(data, minutes, start)
if retCode == code && minutes > 0 {
// check time is expired or not
before, _ := time.ParseInLocation("200601021504", start, time.Local)
now := time.Now()
if before.Add(time.Minute*time.Duration(minutes)).Unix() > now.Unix() {
return true
}
}
return false
}
const TimeLimitCodeLength = 12 + 6 + 40
// create a time limit code
// code format: 12 length date time string + 6 minutes string + 40 sha1 encoded string
func CreateTimeLimitCode(data string, minutes int, startInf interface{}) string {
format := "200601021504"
var start, end time.Time
var startStr, endStr string
if startInf == nil {
// Use now time create code
start = time.Now()
startStr = start.Format(format)
} else {
// use start string create code
startStr = startInf.(string)
start, _ = time.ParseInLocation(format, startStr, time.Local)
startStr = start.Format(format)
}
end = start.Add(time.Minute * time.Duration(minutes))
endStr = end.Format(format)
// create sha1 encode string
sh := sha1.New()
sh.Write([]byte(data + setting.SecretKey + startStr + endStr + com.ToStr(minutes)))
encoded := hex.EncodeToString(sh.Sum(nil))
code := fmt.Sprintf("%s%06d%s", startStr, minutes, encoded)
return code
}
// HashEmail hashes email address to MD5 string.
// https://en.gravatar.com/site/implement/hash/
func HashEmail(email string) string {
email = strings.ToLower(strings.TrimSpace(email))
h := md5.New()
h.Write([]byte(email))
return hex.EncodeToString(h.Sum(nil))
}
// AvatarLink returns relative avatar link to the site domain by given email,
// which includes app sub-url as prefix. However, it is possible
// to return full URL if user enables Gravatar-like service.
func AvatarLink(email string) (url string) {
if setting.EnableFederatedAvatar && setting.LibravatarService != nil {
var err error
url, err = setting.LibravatarService.FromEmail(email)
if err != nil {
log.Error(1, "LibravatarService.FromEmail: %v", err)
}
}
if len(url) == 0 && !setting.DisableGravatar {
url = setting.GravatarSource + HashEmail(email)
}
if len(url) == 0 {
url = setting.AppSubUrl + "/img/avatar_default.png"
}
return url
}
// Seconds-based time units
const (
Minute = 60
Hour = 60 * Minute
Day = 24 * Hour
Week = 7 * Day
Month = 30 * Day
Year = 12 * Month
)
func computeTimeDiff(diff int64) (int64, string) {
diffStr := ""
switch {
case diff <= 0:
diff = 0
diffStr = "now"
case diff < 2:
diff = 0
diffStr = "1 second"
case diff < 1*Minute:
diffStr = fmt.Sprintf("%d seconds", diff)
diff = 0
case diff < 2*Minute:
diff -= 1 * Minute
diffStr = "1 minute"
case diff < 1*Hour:
diffStr = fmt.Sprintf("%d minutes", diff/Minute)
diff -= diff / Minute * Minute
case diff < 2*Hour:
diff -= 1 * Hour
diffStr = "1 hour"
case diff < 1*Day:
diffStr = fmt.Sprintf("%d hours", diff/Hour)
diff -= diff / Hour * Hour
case diff < 2*Day:
diff -= 1 * Day
diffStr = "1 day"
case diff < 1*Week:
diffStr = fmt.Sprintf("%d days", diff/Day)
diff -= diff / Day * Day
case diff < 2*Week:
diff -= 1 * Week
diffStr = "1 week"
case diff < 1*Month:
diffStr = fmt.Sprintf("%d weeks", diff/Week)
diff -= diff / Week * Week
case diff < 2*Month:
diff -= 1 * Month
diffStr = "1 month"
case diff < 1*Year:
diffStr = fmt.Sprintf("%d months", diff/Month)
diff -= diff / Month * Month
case diff < 2*Year:
diff -= 1 * Year
diffStr = "1 year"
default:
diffStr = fmt.Sprintf("%d years", diff/Year)
diff = 0
}
return diff, diffStr
}
// TimeSincePro calculates the time interval and generate full user-friendly string.
func TimeSincePro(then time.Time) string {
now := time.Now()
diff := now.Unix() - then.Unix()
if then.After(now) {
return "future"
}
var timeStr, diffStr string
for {
if diff == 0 {
break
}
diff, diffStr = computeTimeDiff(diff)
timeStr += ", " + diffStr
}
return strings.TrimPrefix(timeStr, ", ")
}
func timeSince(then time.Time, lang string) string {
now := time.Now()
lbl := i18n.Tr(lang, "tool.ago")
diff := now.Unix() - then.Unix()
if then.After(now) {
lbl = i18n.Tr(lang, "tool.from_now")
diff = then.Unix() - now.Unix()
}
switch {
case diff <= 0:
return i18n.Tr(lang, "tool.now")
case diff <= 2:
return i18n.Tr(lang, "tool.1s", lbl)
case diff < 1*Minute:
return i18n.Tr(lang, "tool.seconds", diff, lbl)
case diff < 2*Minute:
return i18n.Tr(lang, "tool.1m", lbl)
case diff < 1*Hour:
return i18n.Tr(lang, "tool.minutes", diff/Minute, lbl)
case diff < 2*Hour:
return i18n.Tr(lang, "tool.1h", lbl)
case diff < 1*Day:
return i18n.Tr(lang, "tool.hours", diff/Hour, lbl)
case diff < 2*Day:
return i18n.Tr(lang, "tool.1d", lbl)
case diff < 1*Week:
return i18n.Tr(lang, "tool.days", diff/Day, lbl)
case diff < 2*Week:
return i18n.Tr(lang, "tool.1w", lbl)
case diff < 1*Month:
return i18n.Tr(lang, "tool.weeks", diff/Week, lbl)
case diff < 2*Month:
return i18n.Tr(lang, "tool.1mon", lbl)
case diff < 1*Year:
return i18n.Tr(lang, "tool.months", diff/Month, lbl)
case diff < 2*Year:
return i18n.Tr(lang, "tool.1y", lbl)
default:
return i18n.Tr(lang, "tool.years", diff/Year, lbl)
}
}
func RawTimeSince(t time.Time, lang string) string {
return timeSince(t, lang)
}
// TimeSince calculates the time interval and generate user-friendly string.
func TimeSince(t time.Time, lang string) template.HTML {
return template.HTML(fmt.Sprintf(`<span class="time-since" title="%s">%s</span>`, t.Format(setting.TimeFormat), timeSince(t, lang)))
}
const (
Byte = 1
KByte = Byte * 1024
MByte = KByte * 1024
GByte = MByte * 1024
TByte = GByte * 1024
PByte = TByte * 1024
EByte = PByte * 1024
)
var bytesSizeTable = map[string]uint64{
"b": Byte,
"kb": KByte,
"mb": MByte,
"gb": GByte,
"tb": TByte,
"pb": PByte,
"eb": EByte,
}
func logn(n, b float64) float64 {
return math.Log(n) / math.Log(b)
}
func humanateBytes(s uint64, base float64, sizes []string) string {
if s < 10 {
return fmt.Sprintf("%dB", s)
}
e := math.Floor(logn(float64(s), base))
suffix := sizes[int(e)]
val := float64(s) / math.Pow(base, math.Floor(e))
f := "%.0f"
if val < 10 {
f = "%.1f"
}
return fmt.Sprintf(f+"%s", val, suffix)
}
// FileSize calculates the file size and generate user-friendly string.
func FileSize(s int64) string {
sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
return humanateBytes(uint64(s), 1024, sizes)
}
// Subtract deals with subtraction of all types of number.
func Subtract(left interface{}, right interface{}) interface{} {
var rleft, rright int64
var fleft, fright float64
var isInt bool = true
switch left.(type) {
case int:
rleft = int64(left.(int))
case int8:
rleft = int64(left.(int8))
case int16:
rleft = int64(left.(int16))
case int32:
rleft = int64(left.(int32))
case int64:
rleft = left.(int64)
case float32:
fleft = float64(left.(float32))
isInt = false
case float64:
fleft = left.(float64)
isInt = false
}
switch right.(type) {
case int:
rright = int64(right.(int))
case int8:
rright = int64(right.(int8))
case int16:
rright = int64(right.(int16))
case int32:
rright = int64(right.(int32))
case int64:
rright = right.(int64)
case float32:
fright = float64(left.(float32))
isInt = false
case float64:
fleft = left.(float64)
isInt = false
}
if isInt {
return rleft - rright
} else {
return fleft + float64(rleft) - (fright + float64(rright))
}
}
// EllipsisString returns a truncated short string,
// it appends '...' in the end of the length of string is too large.
func EllipsisString(str string, length int) string {
if len(str) < length {
return str
}
return str[:length-3] + "..."
}
// TruncateString returns a truncated string with given limit,
// it returns input string if length is not reached limit.
func TruncateString(str string, limit int) string {
if len(str) < limit {
return str
}
return str[:limit]
}
// StringsToInt64s converts a slice of string to a slice of int64.
func StringsToInt64s(strs []string) []int64 {
ints := make([]int64, len(strs))
for i := range strs {
ints[i] = com.StrTo(strs[i]).MustInt64()
}
return ints
}
// Int64sToStrings converts a slice of int64 to a slice of string.
func Int64sToStrings(ints []int64) []string {
strs := make([]string, len(ints))
for i := range ints {
strs[i] = com.ToStr(ints[i])
}
return strs
}
// Int64sToMap converts a slice of int64 to a int64 map.
func Int64sToMap(ints []int64) map[int64]bool {
m := make(map[int64]bool)
for _, i := range ints {
m[i] = true
}
return m
}
// IsLetter reports whether the rune is a letter (category L).
// https://github.com/golang/go/blob/master/src/go/scanner/scanner.go#L257
func IsLetter(ch rune) bool {
return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_' || ch >= 0x80 && unicode.IsLetter(ch)
}
func IsTextFile(data []byte) bool {
return strings.Index(http.DetectContentType(data), "text/") != -1
}
func IsImageFile(data []byte) bool {
return strings.Index(http.DetectContentType(data), "image/") != -1
}
func IsPDFFile(data []byte) bool {
return strings.Index(http.DetectContentType(data), "application/pdf") != -1
}