forgejo/services/webhook/default.go

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// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
// SPDX-License-Identifier: MIT
package webhook
import (
"context"
"crypto/hmac"
"crypto/sha1"
"crypto/sha256"
"encoding/hex"
"fmt"
"html/template"
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"io"
"net/http"
"net/url"
"strings"
webhook_model "code.gitea.io/gitea/models/webhook"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/svg"
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webhook_module "code.gitea.io/gitea/modules/webhook"
"code.gitea.io/gitea/services/forms"
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)
var _ Handler = defaultHandler{}
type defaultHandler struct {
forgejo bool
}
func (dh defaultHandler) Type() webhook_module.HookType {
if dh.forgejo {
return webhook_module.FORGEJO
}
return webhook_module.GITEA
}
func (dh defaultHandler) Icon(size int) template.HTML {
if dh.forgejo {
// forgejo.svg is not in web_src/svg/, so svg.RenderHTML does not work
return imgIcon("forgejo.svg", size)
}
return svg.RenderHTML("gitea-gitea", size, "img")
}
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func (defaultHandler) Metadata(*webhook_model.Webhook) any { return nil }
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func (defaultHandler) FormFields(bind func(any)) FormFields {
var form struct {
forms.WebhookForm
PayloadURL string `binding:"Required;ValidUrl"`
HTTPMethod string `binding:"Required;In(POST,GET)"`
ContentType int `binding:"Required"`
Secret string
}
bind(&form)
contentType := webhook_model.ContentTypeJSON
if webhook_model.HookContentType(form.ContentType) == webhook_model.ContentTypeForm {
contentType = webhook_model.ContentTypeForm
}
return FormFields{
WebhookForm: form.WebhookForm,
URL: form.PayloadURL,
ContentType: contentType,
Secret: form.Secret,
HTTPMethod: form.HTTPMethod,
Metadata: nil,
}
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}
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func (defaultHandler) NewRequest(ctx context.Context, w *webhook_model.Webhook, t *webhook_model.HookTask) (req *http.Request, body []byte, err error) {
switch w.HTTPMethod {
case "":
log.Info("HTTP Method for %s webhook %s [ID: %d] is not set, defaulting to POST", w.Type, w.URL, w.ID)
fallthrough
case http.MethodPost:
switch w.ContentType {
case webhook_model.ContentTypeJSON:
req, err = http.NewRequest("POST", w.URL, strings.NewReader(t.PayloadContent))
if err != nil {
return nil, nil, err
}
req.Header.Set("Content-Type", "application/json")
case webhook_model.ContentTypeForm:
forms := url.Values{
"payload": []string{t.PayloadContent},
}
req, err = http.NewRequest("POST", w.URL, strings.NewReader(forms.Encode()))
if err != nil {
return nil, nil, err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
default:
return nil, nil, fmt.Errorf("invalid content type: %v", w.ContentType)
}
case http.MethodGet:
u, err := url.Parse(w.URL)
if err != nil {
return nil, nil, fmt.Errorf("invalid URL: %w", err)
}
vals := u.Query()
vals["payload"] = []string{t.PayloadContent}
u.RawQuery = vals.Encode()
req, err = http.NewRequest("GET", u.String(), nil)
if err != nil {
return nil, nil, err
}
case http.MethodPut:
switch w.Type {
case webhook_module.MATRIX: // used when t.Version == 1
txnID, err := getMatrixTxnID([]byte(t.PayloadContent))
if err != nil {
return nil, nil, err
}
url := fmt.Sprintf("%s/%s", w.URL, url.PathEscape(txnID))
req, err = http.NewRequest("PUT", url, strings.NewReader(t.PayloadContent))
if err != nil {
return nil, nil, err
}
default:
return nil, nil, fmt.Errorf("invalid http method: %v", w.HTTPMethod)
}
default:
return nil, nil, fmt.Errorf("invalid http method: %v", w.HTTPMethod)
}
body = []byte(t.PayloadContent)
return req, body, addDefaultHeaders(req, []byte(w.Secret), t, body)
}
func addDefaultHeaders(req *http.Request, secret []byte, t *webhook_model.HookTask, payloadContent []byte) error {
var signatureSHA1 string
var signatureSHA256 string
if len(secret) > 0 {
sig1 := hmac.New(sha1.New, secret)
sig256 := hmac.New(sha256.New, secret)
_, err := io.MultiWriter(sig1, sig256).Write(payloadContent)
if err != nil {
// this error should never happen, since the hashes are writing to []byte and always return a nil error.
return fmt.Errorf("prepareWebhooks.sigWrite: %w", err)
}
signatureSHA1 = hex.EncodeToString(sig1.Sum(nil))
signatureSHA256 = hex.EncodeToString(sig256.Sum(nil))
}
event := t.EventType.Event()
eventType := string(t.EventType)
req.Header.Add("X-Forgejo-Delivery", t.UUID)
req.Header.Add("X-Forgejo-Event", event)
req.Header.Add("X-Forgejo-Event-Type", eventType)
req.Header.Add("X-Forgejo-Signature", signatureSHA256)
req.Header.Add("X-Gitea-Delivery", t.UUID)
req.Header.Add("X-Gitea-Event", event)
req.Header.Add("X-Gitea-Event-Type", eventType)
req.Header.Add("X-Gitea-Signature", signatureSHA256)
req.Header.Add("X-Gogs-Delivery", t.UUID)
req.Header.Add("X-Gogs-Event", event)
req.Header.Add("X-Gogs-Event-Type", eventType)
req.Header.Add("X-Gogs-Signature", signatureSHA256)
req.Header.Add("X-Hub-Signature", "sha1="+signatureSHA1)
req.Header.Add("X-Hub-Signature-256", "sha256="+signatureSHA256)
req.Header["X-GitHub-Delivery"] = []string{t.UUID}
req.Header["X-GitHub-Event"] = []string{event}
req.Header["X-GitHub-Event-Type"] = []string{eventType}
return nil
}