Refactor context out of API packages (#8755)

* Refactor context out of API packages

* Update function names per feedback

* Move webhook handlers to web and fix web tests

* Move more webhook tests out of api package

* Fix static handler

api4/handlers.go

@@ -0,0 +1,67 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api4
+
+import (
+	"net/http"
+
+	"github.com/mattermost/mattermost-server/web"
+)
+
+type Context = web.Context
+
+func (api *API) ApiHandler(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
+	return &web.Handler{
+		App:            api.App,
+		HandleFunc:     h,
+		RequireSession: false,
+		TrustRequester: false,
+		RequireMfa:     false,
+		IsStatic:       false,
+	}
+}
+
+func (api *API) ApiSessionRequired(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
+	return &web.Handler{
+		App:            api.App,
+		HandleFunc:     h,
+		RequireSession: true,
+		TrustRequester: false,
+		RequireMfa:     true,
+		IsStatic:       false,
+	}
+}
+
+func (api *API) ApiSessionRequiredMfa(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
+	return &web.Handler{
+		App:            api.App,
+		HandleFunc:     h,
+		RequireSession: true,
+		TrustRequester: false,
+		RequireMfa:     false,
+		IsStatic:       false,
+	}
+}
+
+func (api *API) ApiHandlerTrustRequester(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
+	return &web.Handler{
+		App:            api.App,
+		HandleFunc:     h,
+		RequireSession: false,
+		TrustRequester: true,
+		RequireMfa:     false,
+		IsStatic:       false,
+	}
+}
+
+func (api *API) ApiSessionRequiredTrustRequester(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
+	return &web.Handler{
+		App:            api.App,
+		HandleFunc:     h,
+		RequireSession: true,
+		TrustRequester: true,
+		RequireMfa:     true,
+		IsStatic:       false,
+	}
+}