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61 lines
1.7 KiB
61 lines
1.7 KiB
// Copyright (c) 2020 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 |
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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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