forked from Silverfish/proton-bridge
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Copyright (c) 2021 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package pmapi
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import (
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"net"
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)
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// ProxyTLSDialer wraps a TLSDialer to switch to a proxy if the initial dial fails.
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type ProxyTLSDialer struct {
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dialer TLSDialer
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cm *ClientManager
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}
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// NewProxyTLSDialer constructs a dialer which provides a proxy-managing layer on top of an underlying dialer.
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func NewProxyTLSDialer(dialer TLSDialer, cm *ClientManager) *ProxyTLSDialer {
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return &ProxyTLSDialer{
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dialer: dialer,
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cm: cm,
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}
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}
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// DialTLS dials the given network/address. If it fails, it retries using a proxy.
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func (d *ProxyTLSDialer) DialTLS(network, address string) (conn net.Conn, err error) {
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if conn, err = d.dialer.DialTLS(network, address); err == nil {
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return conn, nil
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}
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if !d.cm.allowProxy {
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return
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}
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var proxy string
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if proxy, err = d.cm.switchToReachableServer(); err != nil {
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return
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}
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_, port, err := net.SplitHostPort(address)
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if err != nil {
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return
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}
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return d.dialer.DialTLS(network, net.JoinHostPort(proxy, port))
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}
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