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