forked from Silverfish/proton-bridge
95 lines
2.8 KiB
Go
95 lines
2.8 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail 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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"errors"
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"fmt"
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"net/http"
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"time"
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)
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const protonStatusURL = "http://protonstatus.com/vpn_status"
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// ErrNoInternetConnection indicates that both protonstatus and the API are unreachable.
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var ErrNoInternetConnection = errors.New("no internet connection")
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// CheckConnection returns an error if there is no internet connection.
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// This should be moved to the ConnectionManager when it is implemented.
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func (cm *ClientManager) CheckConnection() error {
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// We use a normal dialer here which doesn't check tls fingerprints.
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client := &http.Client{Timeout: time.Second * 10}
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// Do not cumulate timeouts, use goroutines.
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retStatus := make(chan error)
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retAPI := make(chan error)
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// vpn_status endpoint is fast and returns only OK. We check the connection only.
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go checkConnection(client, protonStatusURL, retStatus)
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// Check of API reachability also uses a fast endpoint.
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go checkConnection(client, cm.GetRootURL()+"/tests/ping", retAPI)
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errStatus := <-retStatus
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errAPI := <-retAPI
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switch {
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case errStatus == nil && errAPI == nil:
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return nil
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case errStatus == nil && errAPI != nil:
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cm.log.Error("ProtonStatus is reachable but API is not")
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return ErrAPINotReachable
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case errStatus != nil && errAPI == nil:
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cm.log.Warn("API is reachable but protonstatus is not")
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return nil
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case errStatus != nil && errAPI != nil:
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cm.log.Error("Both ProtonStatus and API are unreachable")
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return ErrNoInternetConnection
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}
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return nil
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}
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// CheckConnection returns an error if there is no internet connection.
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func CheckConnection() error {
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client := &http.Client{Timeout: time.Second * 10}
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retStatus := make(chan error)
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go checkConnection(client, protonStatusURL, retStatus)
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return <-retStatus
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}
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func checkConnection(client *http.Client, url string, errorChannel chan error) {
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resp, err := client.Get(url)
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if err != nil {
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errorChannel <- err
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return
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}
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_ = resp.Body.Close()
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if resp.StatusCode != 200 {
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errorChannel <- fmt.Errorf("HTTP status code %d", resp.StatusCode)
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return
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}
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errorChannel <- nil
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}
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