99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
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/*
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* LURE - Linux User REpository
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* Copyright (C) 2023 Elara Musayelyan
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"io"
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"net/http"
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"os"
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"strings"
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"go.elara.ws/logger/log"
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"go.elara.ws/lure/pkg/repos"
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)
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func handleWebhook(sigCh chan<- struct{}) http.HandlerFunc {
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return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
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if req.Header.Get("X-GitHub-Event") != "push" {
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http.Error(res, "Only push events are accepted by this bot", http.StatusBadRequest)
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return
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}
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err := verifySecure(req)
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if err != nil {
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http.Error(res, err.Error(), http.StatusForbidden)
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return
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}
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sigCh <- struct{}{}
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return
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})
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}
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func verifySecure(req *http.Request) error {
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sigStr := req.Header.Get("X-Hub-Signature-256")
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sig, err := hex.DecodeString(strings.TrimPrefix(sigStr, "sha256="))
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if err != nil {
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return err
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}
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secretStr, ok := os.LookupEnv("LURE_API_GITHUB_SECRET")
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if !ok {
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return errors.New("LURE_API_GITHUB_SECRET must be set to the secret used for setting up the github webhook\n\n")
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}
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secret := []byte(secretStr)
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h := hmac.New(sha256.New, secret)
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_, err = io.Copy(h, req.Body)
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if err != nil {
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return err
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}
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if !hmac.Equal(h.Sum(nil), sig) {
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log.Warn("Insecure webhook request").
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Str("from", req.RemoteAddr).
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Bytes("sig", sig).
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Bytes("hmac", h.Sum(nil)).
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Send()
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return errors.New("webhook signature mismatch")
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}
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return nil
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}
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func repoPullWorker(ctx context.Context, sigCh <-chan struct{}) {
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for {
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select {
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case <-sigCh:
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err := repos.Pull(ctx, nil)
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if err != nil {
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log.Warn("Error while pulling repositories").Err(err).Send()
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}
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case <-ctx.Done():
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return
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}
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}
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}
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