feat(webhooks): add support for service update webhooks (#2161)

* Initial pass at adding webhook controller and routes

* Moving some objects around

* Cleaning up comments

* Fixing syntax, switching to using the docker sdk over building an http client

* Adding delete and list functionality

* Updating the handler to use the correct permissions. Updating some comments

* Fixing some comments

* Code cleanup per pull request comments

* Cleanup per PR feedback. Syntax error fix

* Initial creation of webhook app code

* Moving ClientFactory creation out of handler code and instead using the one created by the main process. Removing webhookInspect method and updating the list function to use json filters

* Delete now works on the webhook ID vs service ID

* WIP - Service creates a webhook. Display will show an existing webhook URL.

* Adding the webhook field to the service view. There is now the ability to add or remove a webhook from a service

* Moving all api calls to be webhooks vs webhook

* Code cleanup. Moving all api calls to be webhooks vs webhook

* More conversion of webhook to webhooks?

* Moving UI elements around. Starting function for copying to clipboard

* Finalizing function for copying to clipboard. Adding button that calls function and copies webhook to clipboard.

* Fixing UI issues. Hiding field entirely when there is no webhook

* Moving URL crafting to a helper method. The edit pane for service now creates/deletes webhooks immidiately.

* style(service-details): update webhook line

* feat(api): strip sha when updating an image via the update webhook

* Fixing up some copy. Only displying the port if it is not http or https

* Fixing tooltip copy. Setting the forceupdate to be true to require an update to occur

* Fixing code climate errors

* Adding WebhookType field and setting to ServiceWebhook for new webhooks. Renaming ServiceID to resourceID so future work can add new types of webhooks in other resource areas.

* Adding the webhook type to the payload to support more types of webhooks in the future. Setting the type correctly when creating one for a service

* feat(webhooks): changes related to webhook management

* API code cleanup, removing unneeded functions, and updating validation logic

* Incorrectly ignoring the error that the webhook did not exist

* Re-adding missing error handling. Changing error response to be a 404 vs 500 when token can't find an object

* fix(webhooks): close Docker client after service webhook execution

api/http/handler/webhooks/handler.go

@@ -0,0 +1,35 @@
+package webhooks
+
+import (
+	"net/http"
+
+	"github.com/gorilla/mux"
+	portainer "github.com/portainer/portainer"
+	"github.com/portainer/portainer/docker"
+	httperror "github.com/portainer/portainer/http/error"
+	"github.com/portainer/portainer/http/security"
+)
+
+// Handler is the HTTP handler used to handle webhook operations.
+type Handler struct {
+	*mux.Router
+	WebhookService      portainer.WebhookService
+	EndpointService     portainer.EndpointService
+	DockerClientFactory *docker.ClientFactory
+}
+
+// NewHandler creates a handler to manage settings operations.
+func NewHandler(bouncer *security.RequestBouncer) *Handler {
+	h := &Handler{
+		Router: mux.NewRouter(),
+	}
+	h.Handle("/webhooks",
+		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.webhookCreate))).Methods(http.MethodPost)
+	h.Handle("/webhooks",
+		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.webhookList))).Methods(http.MethodGet)
+	h.Handle("/webhooks/{id}",
+		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.webhookDelete))).Methods(http.MethodDelete)
+	h.Handle("/webhooks/{token}",
+		bouncer.PublicAccess(httperror.LoggerHandler(h.webhookExecute))).Methods(http.MethodPost)
+	return h
+}