// Extract services webhooks from github.com
func (p *WebHook) Extract(buildCfg *api.BuildConfig, secret, path string, req *http.Request) (revision *api.SourceRevision, proceed bool, err error) {
	trigger, ok := webhook.FindTriggerPolicy(api.GitHubWebHookBuildTriggerType, buildCfg)
	if !ok {
		err = webhook.ErrHookNotEnabled
		return
	}
	glog.V(4).Infof("Checking if the provided secret for BuildConfig %s/%s matches", buildCfg.Namespace, buildCfg.Name)
	if trigger.GitHubWebHook.Secret != secret {
		err = webhook.ErrSecretMismatch
		return
	}
	glog.V(4).Infof("Verifying build request for BuildConfig %s/%s", buildCfg.Namespace, buildCfg.Name)
	if err = verifyRequest(req); err != nil {
		return
	}
	method := getEvent(req.Header)
	if method != "ping" && method != "push" {
		err = fmt.Errorf("Unknown X-GitHub-Event or X-Gogs-Event %s", method)
		return
	}
	if method == "ping" {
		proceed = false
		return
	}
	body, err := ioutil.ReadAll(req.Body)
	if err != nil {
		return
	}
	var event pushEvent
	if err = json.Unmarshal(body, &event); err != nil {
		return
	}
	proceed = webhook.GitRefMatches(event.Ref, buildCfg.Parameters.Source.Git.Ref)
	if !proceed {
		glog.V(2).Infof("Skipping build for BuildConfig %s/%s.  Branch reference from '%s' does not match configuration", buildCfg.Namespace, buildCfg, event)
	}

	revision = &api.SourceRevision{
		Type: api.BuildSourceGit,
		Git: &api.GitSourceRevision{
			Commit:    event.HeadCommit.ID,
			Author:    event.HeadCommit.Author,
			Committer: event.HeadCommit.Committer,
			Message:   event.HeadCommit.Message,
		},
	}

	return
}
// Extract services generic webhooks.
func (p *WebHookPlugin) Extract(buildCfg *api.BuildConfig, secret, path string, req *http.Request) (revision *api.SourceRevision, proceed bool, err error) {
	trigger, ok := webhook.FindTriggerPolicy(api.GenericWebHookBuildTriggerType, buildCfg)
	if !ok {
		err = webhook.ErrHookNotEnabled
		return
	}
	glog.V(4).Infof("Checking if the provided secret for BuildConfig %s/%s matches", buildCfg.Namespace, buildCfg.Name)
	if trigger.GenericWebHook.Secret != secret {
		err = webhook.ErrSecretMismatch
		return
	}
	glog.V(4).Infof("Verifying build request for BuildConfig %s/%s", buildCfg.Namespace, buildCfg.Name)
	if err = verifyRequest(req); err != nil {
		return
	}

	git := buildCfg.Parameters.Source.Git
	if git == nil {
		glog.V(4).Infof("No source defined for BuildConfig %s/%s, but triggering anyway", buildCfg.Namespace, buildCfg.Name)
		return nil, true, nil
	}

	if req.Body != nil && req.Header.Get("Content-Type") == "application/json" {
		body, err := ioutil.ReadAll(req.Body)
		if err != nil {
			return nil, false, err
		}
		if len(body) == 0 {
			return nil, true, nil
		}
		var data api.GenericWebHookEvent
		if err = json.Unmarshal(body, &data); err != nil {
			glog.V(4).Infof("Error unmarshaling json %v, but continuing", err)
			return nil, true, nil
		}
		if data.Git == nil {
			glog.V(4).Infof("No git information for the generic webhook found in %s/%s", buildCfg.Namespace, buildCfg.Name)
			return nil, true, nil
		}

		if data.Git.Refs != nil {
			for _, ref := range data.Git.Refs {
				if webhook.GitRefMatches(ref.Ref, git.Ref) {
					revision = &api.SourceRevision{
						Type: api.BuildSourceGit,
						Git:  &ref.GitSourceRevision,
					}
					return revision, true, nil
				}
			}
			glog.V(2).Infof("Skipping build for BuildConfig %s/%s. None of the supplied refs matched %q", buildCfg.Namespace, buildCfg, git.Ref)
			return nil, false, nil
		}
		if !webhook.GitRefMatches(data.Git.Ref, git.Ref) {
			glog.V(2).Infof("Skipping build for BuildConfig %s/%s. Branch reference from %q does not match configuration", buildCfg.Namespace, buildCfg.Name, data.Git.Ref)
			return nil, false, nil
		}
		revision = &api.SourceRevision{
			Type: api.BuildSourceGit,
			Git:  &data.Git.GitSourceRevision,
		}
	}
	return revision, true, nil
}