forked from Silverfish/proton-bridge
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
// Copyright (c) 2021 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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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"github.com/ProtonMail/gopenpgp/v2/crypto"
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)
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// DownloadAndVerify downloads a file and its signature from the given locations `file` and `sig`.
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// The file and its signature are verified using the given keyring `kr`.
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// If the file is verified successfully, it can be read from the returned reader.
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// TLS fingerprinting is used to verify that connections are only made to known servers.
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func (c *client) DownloadAndVerify(file, sig string, kr *crypto.KeyRing) (io.Reader, error) {
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var fb, sb []byte
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if err := c.fetchFile(file, func(r io.Reader) (err error) {
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fb, err = ioutil.ReadAll(r)
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return err
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}); err != nil {
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return nil, err
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}
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if err := c.fetchFile(sig, func(r io.Reader) (err error) {
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sb, err = ioutil.ReadAll(r)
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return err
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}); err != nil {
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return nil, err
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}
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if err := kr.VerifyDetached(
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crypto.NewPlainMessage(fb),
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crypto.NewPGPSignature(sb),
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crypto.GetUnixTime(),
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); err != nil {
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return nil, err
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}
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return bytes.NewReader(fb), nil
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}
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func (c *client) fetchFile(file string, fn func(io.Reader) error) error {
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res, err := c.hc.Get(file)
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if err != nil {
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return err
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}
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defer func() { _ = res.Body.Close() }()
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if res.StatusCode != http.StatusOK {
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return fmt.Errorf("failed to get file: http error %v", res.StatusCode)
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}
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return fn(res.Body)
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}
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