98 lines
2 KiB
Go
98 lines
2 KiB
Go
// Copyright 2019 Drone.IO Inc. All rights reserved.
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// Use of this source code is governed by the Drone Non-Commercial License
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// that can be found in the LICENSE file.
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package webhook
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"net/http"
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"time"
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"github.com/drone/drone/core"
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"github.com/99designs/httpsignatures-go"
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)
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// required http headers
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var headers = []string{
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"date",
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"digest",
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}
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var signer = httpsignatures.NewSigner(
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httpsignatures.AlgorithmHmacSha256,
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headers...,
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)
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// New returns a new Webhook sender.
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func New(endpoints []string, secret string) core.WebhookSender {
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return &sender{
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Endpoints: endpoints,
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Secret: secret,
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}
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}
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type sender struct {
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Client *http.Client
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Endpoints []string
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Secret string
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}
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// Send sends the JSON encoded webhook to the global
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// HTTP endpoints.
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func (s *sender) Send(ctx context.Context, payload *core.WebhookData) error {
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if len(s.Endpoints) == 0 {
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return nil
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}
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data, _ := json.Marshal(payload)
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for _, endpoint := range s.Endpoints {
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err := s.send(endpoint, s.Secret, payload.Event, data)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (s *sender) send(endpoint, secret, event string, data []byte) error {
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ctx := context.Background()
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ctx, cancel := context.WithTimeout(ctx, time.Minute)
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defer cancel()
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buf := bytes.NewBuffer(data)
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req, err := http.NewRequest("POST", endpoint, buf)
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if err != nil {
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return err
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}
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req = req.WithContext(ctx)
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req.Header.Add("X-Drone-Event", event)
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req.Header.Add("Content-Type", "application/json")
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req.Header.Add("Digest", "SHA-256="+digest(data))
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req.Header.Add("Date", time.Now().UTC().Format(http.TimeFormat))
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err = signer.SignRequest("hmac-key", s.Secret, req)
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res, err := s.client().Do(req)
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if res != nil {
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res.Body.Close()
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}
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return err
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}
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func (s *sender) client() *http.Client {
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if s.Client == nil {
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return http.DefaultClient
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}
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return s.Client
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}
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func digest(data []byte) string {
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h := sha256.New()
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h.Write(data)
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return base64.StdEncoding.EncodeToString(h.Sum(nil))
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}
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