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dialer_basic.go
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dialer_basic.go
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// Copyright (c) 2023 Proton AG
//
// This file is part of Proton Mail Bridge.Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package dialer
import (
"context"
"crypto/tls"
"net"
"net/http"
"time"
)
type TLSDialer interface {
DialTLSContext(ctx context.Context, network, address string) (conn net.Conn, err error)
}
// CreateTransportWithDialer creates an http.Transport that uses the given dialer to make TLS connections.
func CreateTransportWithDialer(dialer TLSDialer) *http.Transport {
return &http.Transport{
DialTLSContext: dialer.DialTLSContext,
Proxy: http.ProxyFromEnvironment,
MaxIdleConns: 100,
MaxIdleConnsPerHost: 100,
IdleConnTimeout: 5 * time.Minute,
ExpectContinueTimeout: 500 * time.Millisecond,
// GODT-126: this was initially 10s but logs from users showed a significant number
// were hitting this timeout, possibly due to flaky wifi taking >10s to reconnect.
// Bumping to 30s for now to avoid this problem.
ResponseHeaderTimeout: 30 * time.Second,
// If we allow up to 30 seconds for response headers, it is reasonable to allow up
// to 30 seconds for the TLS handshake to take place.
TLSHandshakeTimeout: 30 * time.Second,
}
}
// BasicTLSDialer implements TLSDialer.
type BasicTLSDialer struct {
hostURL string
}
// NewBasicTLSDialer returns a new BasicTLSDialer.
func NewBasicTLSDialer(hostURL string) *BasicTLSDialer {
return &BasicTLSDialer{
hostURL: hostURL,
}
}
// DialTLSContext returns a connection to the given address using the given network.
func (d *BasicTLSDialer) DialTLSContext(ctx context.Context, network, address string) (conn net.Conn, err error) {
return (&tls.Dialer{
NetDialer: &net.Dialer{
Timeout: 30 * time.Second,
},
Config: &tls.Config{
InsecureSkipVerify: address != d.hostURL, //nolint:gosec
},
}).DialContext(ctx, network, address)
}