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util.go
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util.go
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package dl
import (
"bytes"
"compress/zlib"
"encoding/base64"
"math/rand"
"github.com/juju/errors"
"github.com/saintfish/chardet"
)
var userAgents = map[string][]string{
"google": []string{"5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"},
"pc": []string{
"5.0 (X11; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0",
"5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36",
"5.0 (Macintosh; Intel Mac OS X 10.9; rv:29.0) Gecko/20100101 Firefox/29.0",
"5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36",
"Mac / Safari 7: 5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/537.75.14",
"5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0",
"5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36",
"4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)",
"4.0 (compatible; MSIE 7.0; Windows NT 5.1)",
"4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0)",
"5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)",
"5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)",
"5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko"},
"mobile": []string{
"5.0 (Android; Mobile; rv:29.0) Gecko/29.0 Firefox/29.0",
"5.0 (Linux; Android 4.4.2; Nexus 4 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.114 Mobile Safari/537.36",
"5.0 (iPad; CPU OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) CriOS/34.0.1847.18 Mobile/11B554a Safari/9537.53",
"5.0 (iPad; CPU OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53"}}
func GetUserAgent(platform string) string {
if platform != "pc" && platform != "mobile" && platform != "google" {
platform = "pc"
}
agents := userAgents[platform]
return "Mozilla/" + agents[rand.Intn(len(agents))]
}
func GetHeaders(platform string) map[string]string {
if platform == "" {
return nil
}
headers := map[string]string{
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"Accept-Language": "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3",
"Accept-Encoding": "gzip, deflate",
"User-Agent": GetUserAgent(platform),
}
return headers
}
func GuessEncoding(content []byte) (string, error) {
detector := chardet.NewHtmlDetector()
res, err := detector.DetectBest(content)
if err != nil {
return "", errors.Trace(err)
}
return res.Charset, nil
}
func CompressPage(page []byte) string {
var cPage bytes.Buffer
cWriter := zlib.NewWriter(&cPage)
cWriter.Write(page)
cWriter.Close()
b64Page := base64.StdEncoding.EncodeToString(cPage.Bytes())
return b64Page
}