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package cfbypass
import (
"context"
"fmt"
"math/rand"
"metachan/utils/browsers"
"net"
"net/http"
"net/http/cookiejar"
"time"
utls "github.com/refraction-networking/utls"
)
func NewCloudflareClient(timeout time.Duration) *CloudflareClient {
selectedProfile := browsers.SelectRandomProfile()
cookieJar, _ := cookiejar.New(nil)
transport := &http.Transport{
DialTLSContext: func(ctx context.Context, network, address string) (net.Conn, error) {
return dialTLSWithFingerprint(ctx, network, address, selectedProfile.TLSFingerprint)
},
DisableKeepAlives: false,
MaxIdleConns: 10,
IdleConnTimeout: 90 * time.Second,
}
return &CloudflareClient{
HttpClient: &http.Client{
Timeout: timeout,
Transport: transport,
Jar: cookieJar,
},
BrowserProfile: selectedProfile,
}
}
func dialTLSWithFingerprint(ctx context.Context, network string, address string, fingerprint utls.ClientHelloID) (net.Conn, error) {
dialer := &net.Dialer{}
rawConnection, err := dialer.DialContext(ctx, network, address)
if err != nil {
return nil, fmt.Errorf("failed to dial %s: %w", address, err)
}
host, _, err := net.SplitHostPort(address)
if err != nil {
rawConnection.Close()
return nil, fmt.Errorf("failed to split host and port from %s: %w", address, err)
}
clientHelloSpec, specErr := utls.UTLSIdToSpec(fingerprint)
if specErr != nil {
rawConnection.Close()
return nil, fmt.Errorf("failed to convert fingerprint to spec: %w", specErr)
}
for _, extension := range clientHelloSpec.Extensions {
if alpnExtension, isALPN := extension.(*utls.ALPNExtension); isALPN {
alpnExtension.AlpnProtocols = []string{"http/1.1"}
break
}
}
utlsConnection := utls.UClient(rawConnection, &utls.Config{
ServerName: host,
}, utls.HelloCustom)
if applyErr := utlsConnection.ApplyPreset(&clientHelloSpec); applyErr != nil {
rawConnection.Close()
return nil, fmt.Errorf("failed to apply TLS preset for %s: %w", address, applyErr)
}
if handshakeErr := utlsConnection.HandshakeContext(ctx); handshakeErr != nil {
rawConnection.Close()
return nil, fmt.Errorf("TLS handshake failed for %s: %w", address, handshakeErr)
}
return utlsConnection, nil
}
func AddJitter(baseDelay time.Duration) time.Duration {
jitterRange := float64(baseDelay) * 0.4
jitterOffset := rand.Float64()*jitterRange - jitterRange/2
return baseDelay + time.Duration(jitterOffset)
}
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