Created
February 10, 2014 20:45
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4chan image downloader in Go
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package main | |
import ( | |
"code.google.com/p/go.net/html" | |
"flag" | |
"fmt" | |
"github.com/ziutek/mymysql/mysql" | |
_ "github.com/ziutek/mymysql/native" | |
"io" | |
"io/ioutil" | |
"log" | |
"net/http" | |
"os" | |
"strings" | |
) | |
var SUB = "/b/" | |
func main() { | |
flag.Parse() | |
SUB = "/" + flag.Args()[0] + "/" | |
// connects to db | |
db := mysql.New("tcp", "", "localhost:3306", "user", "pw", "db") | |
err := db.Connect() | |
if err != nil { | |
panic(err) | |
} | |
// get filenames | |
imageUrls := getImageSrcFromPage("http://4chan.org" + SUB) | |
filenames := make([]string, 0) | |
for _, ur := range imageUrls { | |
filenames = append(filenames, strings.Replace(ur, "//", "http://", -1)) | |
} | |
stmt, _ := db.Prepare("insert into files values (?)") | |
// download files if not in db | |
for _, fn := range filenames { | |
rows, _, _ := db.Query("select * from files where name = '%s'", fn) | |
if len(rows) < 1 { | |
_, _ = stmt.Run(fn) | |
fmt.Println("Processing " + fn) | |
response, _ := http.Get(fn) | |
// check if directory exists | |
_, err := os.Stat("./pics" + SUB) | |
if err != nil { | |
// create path | |
os.Mkdir("./pics"+SUB, 0777) | |
} | |
out, err := os.Create("./pics" + SUB + strings.Split(fn, "/")[5]) | |
if err != nil { | |
fmt.Println(err) | |
} | |
io.Copy(out, response.Body) | |
out.Close() | |
response.Body.Close() | |
} | |
} | |
db.Close() | |
} | |
func getImageSrcFromPage(url string) []string { | |
response, err := http.Get(url) | |
if err != nil { | |
return nil | |
} | |
defer response.Body.Close() | |
bodyString, _ := ioutil.ReadAll(response.Body) | |
body := string(bodyString) | |
return collectUrls(body) | |
} | |
func collectUrls(body string) []string { | |
document, err := html.Parse(strings.NewReader(body)) | |
if err != nil { | |
log.Printf("Error parsing urls for %s\n", body) | |
} | |
urls := make([]string, 0) | |
var f func(*html.Node) | |
f = func(n *html.Node) { | |
if n.Type == html.ElementNode && (n.Data == "a" || n.Data == "A") { | |
for _, a := range n.Attr { | |
if a.Key == "href" || a.Key == "HREF" { | |
if strings.Contains(a.Val, "//i.4cdn.org"+SUB+"src/") { | |
urls = append(urls, a.Val) | |
break | |
} | |
} | |
} | |
} | |
for c := n.FirstChild; c != nil; c = c.NextSibling { | |
f(c) | |
} | |
} | |
f(document) | |
return urls | |
} |
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run with:
go run 4chanloader.go
example:
go run 4chanloader.go b
go run 4chanloader.go ck