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

web/static.go

@@ -0,0 +1,84 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package web
+
+import (
+	"fmt"
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	"github.com/NYTimes/gziphandler"
+
+	"github.com/mattermost/mattermost-server/mlog"
+	"github.com/mattermost/mattermost-server/model"
+	"github.com/mattermost/mattermost-server/utils"
+)
+
+func (w *Web) InitStatic() {
+	if *w.App.Config().ServiceSettings.WebserverMode != "disabled" {
+		staticDir, _ := utils.FindDir(model.CLIENT_DIR)
+		mlog.Debug(fmt.Sprintf("Using client directory at %v", staticDir))
+
+		staticHandler := staticHandler(http.StripPrefix("/static/", http.FileServer(http.Dir(staticDir))))
+		pluginHandler := pluginHandler(w.App.Config, http.StripPrefix("/static/plugins/", http.FileServer(http.Dir(*w.App.Config().PluginSettings.ClientDirectory))))
+
+		if *w.App.Config().ServiceSettings.WebserverMode == "gzip" {
+			staticHandler = gziphandler.GzipHandler(staticHandler)
+			pluginHandler = gziphandler.GzipHandler(pluginHandler)
+		}
+
+		w.MainRouter.PathPrefix("/static/plugins/").Handler(pluginHandler)
+		w.MainRouter.PathPrefix("/static/").Handler(staticHandler)
+		w.MainRouter.Handle("/{anything:.*}", w.NewStaticHandler(root)).Methods("GET")
+	}
+}
+
+func root(c *Context, w http.ResponseWriter, r *http.Request) {
+
+	if !CheckClientCompatability(r.UserAgent()) {
+		w.Header().Set("Cache-Control", "no-store")
+		page := utils.NewHTMLTemplate(c.App.HTMLTemplates(), "unsupported_browser")
+		page.Props["Title"] = c.T("web.error.unsupported_browser.title")
+		page.Props["Message"] = c.T("web.error.unsupported_browser.message")
+		page.RenderToWriter(w)
+		return
+	}
+
+	if IsApiCall(r) {
+		Handle404(c.App, w, r)
+		return
+	}
+
+	w.Header().Set("Cache-Control", "no-cache, max-age=31556926, public")
+
+	staticDir, _ := utils.FindDir(model.CLIENT_DIR)
+	http.ServeFile(w, r, filepath.Join(staticDir, "root.html"))
+}
+
+func staticHandler(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Cache-Control", "max-age=31556926, public")
+		if strings.HasSuffix(r.URL.Path, "/") {
+			http.NotFound(w, r)
+			return
+		}
+		handler.ServeHTTP(w, r)
+	})
+}
+
+func pluginHandler(config model.ConfigFunc, handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if *config().ServiceSettings.EnableDeveloper {
+			w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+		} else {
+			w.Header().Set("Cache-Control", "max-age=31556926, public")
+		}
+		if strings.HasSuffix(r.URL.Path, "/") {
+			http.NotFound(w, r)
+			return
+		}
+		handler.ServeHTTP(w, r)
+	})
+}