86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package httpconn
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import (
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"bufio"
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"context"
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"crypto/tls"
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"errors"
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"io"
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"git.crumpington.com/public/jldb/lib/errs"
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"net"
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"net/http"
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"net/url"
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"time"
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)
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var ErrInvalidStatus = errors.New("invalid status")
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func Dial(rawURL string) (net.Conn, error) {
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u, err := url.Parse(rawURL)
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if err != nil {
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return nil, errs.Unexpected.WithErr(err)
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}
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switch u.Scheme {
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case "https":
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return DialHTTPS(u.Host+":443", u.Path)
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case "http":
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return DialHTTP(u.Host, u.Path)
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default:
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return nil, errs.Unexpected.WithMsg("Unknown scheme: " + u.Scheme)
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}
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}
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func DialHTTPS(host, path string) (net.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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d := tls.Dialer{}
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conn, err := d.DialContext(ctx, "tcp", host)
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cancel()
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if err != nil {
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return nil, errs.IO.WithErr(err)
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}
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return finishDialing(conn, host, path)
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}
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func DialHTTPSWithIP(ip, host, path string) (net.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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d := tls.Dialer{Config: &tls.Config{ServerName: host}}
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conn, err := d.DialContext(ctx, "tcp", ip)
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cancel()
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if err != nil {
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return nil, errs.IO.WithErr(err)
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}
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return finishDialing(conn, host, path)
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}
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func DialHTTP(host, path string) (net.Conn, error) {
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conn, err := net.Dial("tcp", host)
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if err != nil {
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return nil, errs.IO.WithErr(err)
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}
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return finishDialing(conn, host, path)
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}
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func finishDialing(conn net.Conn, host, path string) (net.Conn, error) {
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conn.SetDeadline(time.Now().Add(10 * time.Second))
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io.WriteString(conn, "CONNECT "+path+" HTTP/1.0\n")
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io.WriteString(conn, "Host: "+host+"\n\n")
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// Require successful HTTP response before using the conn.
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resp, err := http.ReadResponse(bufio.NewReader(conn), &http.Request{Method: "CONNECT"})
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if err != nil {
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conn.Close()
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return nil, errs.IO.WithErr(err)
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}
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if resp.Status != "200 OK" {
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conn.Close()
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return nil, errs.IO.WithMsg("invalid status: %s", resp.Status)
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}
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conn.SetDeadline(time.Time{})
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return conn, nil
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}
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