Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/web/static.go

@@ -0,0 +1,174 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package web
+
+import (
+	"bytes"
+	"fmt"
+	"html"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/mattermost/gziphandler"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils"
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils/fileutils"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/templates"
+)
+
+var robotsTxt = []byte("User-agent: *\nDisallow: /\n")
+
+func (w *Web) InitStatic() {
+	if *w.srv.Config().ServiceSettings.WebserverMode != "disabled" {
+		if err := utils.UpdateAssetsSubpathFromConfig(w.srv.Config()); err != nil {
+			mlog.Error("Failed to update assets subpath from config", mlog.Err(err))
+		}
+
+		staticDir, _ := fileutils.FindDir(model.ClientDir)
+		mlog.Debug("Using client directory", mlog.String("clientDir", staticDir))
+
+		subpath, _ := utils.GetSubpathFromConfig(w.srv.Config())
+
+		staticHandler := staticFilesHandler(http.StripPrefix(path.Join(subpath, "static"), http.FileServer(http.Dir(staticDir))))
+		pluginHandler := staticFilesHandler(http.StripPrefix(path.Join(subpath, "static", "plugins"), http.FileServer(http.Dir(*w.srv.Config().PluginSettings.ClientDirectory))))
+
+		if *w.srv.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("/robots.txt", http.HandlerFunc(robotsHandler))
+		w.MainRouter.Handle("/unsupported_browser.js", http.HandlerFunc(unsupportedBrowserScriptHandler))
+		w.MainRouter.Handle("/{anything:.*}", w.NewStaticHandler(root)).Methods("GET")
+
+		// When a subpath is defined, it's necessary to handle redirects without a
+		// trailing slash. We don't want to use StrictSlash on the w.MainRouter and affect
+		// all routes, just /subpath -> /subpath/.
+		w.MainRouter.HandleFunc("", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			r.URL.Path += "/"
+			http.Redirect(w, r, r.URL.String(), http.StatusFound)
+		}))
+	}
+}
+
+func root(c *Context, w http.ResponseWriter, r *http.Request) {
+
+	if !CheckClientCompatibility(r.UserAgent()) {
+		w.Header().Set("Cache-Control", "no-store")
+		data := renderUnsupportedBrowser(c.AppContext, r)
+
+		c.App.Srv().TemplatesContainer().Render(w, "unsupported_browser", data)
+		return
+	}
+
+	if IsAPICall(c.App, r) {
+		Handle404(c.App, w, r)
+		return
+	}
+
+	w.Header().Set("Cache-Control", "no-cache, max-age=31556926, public")
+
+	staticDir, _ := fileutils.FindDir(model.ClientDir)
+	contents, err := os.ReadFile(filepath.Join(staticDir, "root.html"))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusNotFound)
+		return
+	}
+
+	titleTemplate := "<title>%s</title>"
+	originalHTML := fmt.Sprintf(titleTemplate, html.EscapeString(model.TeamSettingsDefaultSiteName))
+	modifiedHTML := getOpenGraphMetaTags(c)
+	if originalHTML != modifiedHTML {
+		contents = bytes.ReplaceAll(contents, []byte(originalHTML), []byte(modifiedHTML))
+	}
+
+	w.Header().Set("Content-Type", "text/html")
+	w.Write(contents)
+}
+
+func staticFilesHandler(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		//wrap our ResponseWriter with our no-cache 404-handler
+		w = &notFoundNoCacheResponseWriter{ResponseWriter: w}
+
+		if path.Base(r.URL.Path) == "remote_entry.js" {
+			w.Header().Set("Cache-Control", "no-cache, max-age=31556926, public")
+		} else {
+			w.Header().Set("Cache-Control", "max-age=31556926, public")
+		}
+
+		// Hardcoded sensible default values for these security headers. Feel free to override in proxy or ingress
+		w.Header().Set("Permissions-Policy", "")
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+		w.Header().Set("Referrer-Policy", "no-referrer")
+
+		if strings.HasSuffix(r.URL.Path, "/") {
+			http.NotFound(w, r)
+			return
+		}
+
+		handler.ServeHTTP(w, r)
+	})
+}
+
+type notFoundNoCacheResponseWriter struct {
+	http.ResponseWriter
+}
+
+func (w *notFoundNoCacheResponseWriter) WriteHeader(statusCode int) {
+	if statusCode == http.StatusNotFound {
+		// we have a 404, update our cache header first then fall through
+		w.Header().Set("Cache-Control", "no-cache, public")
+	}
+	w.ResponseWriter.WriteHeader(statusCode)
+}
+
+func robotsHandler(w http.ResponseWriter, r *http.Request) {
+	if strings.HasSuffix(r.URL.Path, "/") {
+		http.NotFound(w, r)
+		return
+	}
+	w.Write(robotsTxt)
+}
+
+func unsupportedBrowserScriptHandler(w http.ResponseWriter, r *http.Request) {
+	if strings.HasSuffix(r.URL.Path, "/") {
+		http.NotFound(w, r)
+		return
+	}
+
+	templatesDir, _ := templates.GetTemplateDirectory()
+	http.ServeFile(w, r, filepath.Join(templatesDir, "unsupported_browser.js"))
+}
+
+func getOpenGraphMetaTags(c *Context) string {
+	siteName := model.TeamSettingsDefaultSiteName
+	customSiteName := c.App.Srv().Config().TeamSettings.SiteName
+	if customSiteName != nil && *customSiteName != "" {
+		siteName = *customSiteName
+	}
+
+	siteDescription := model.TeamSettingsDefaultCustomDescriptionText
+	customSiteDescription := c.App.Srv().Config().TeamSettings.CustomDescriptionText
+	if customSiteDescription != nil && *customSiteDescription != "" {
+		siteDescription = *customSiteDescription
+	}
+
+	titleTemplate := "<title>%s</title>"
+	titleHTML := fmt.Sprintf(titleTemplate, html.EscapeString(siteName))
+	descriptionHTML := ""
+	if siteDescription != "" {
+		descriptionTemplate := "<meta property=\"og:description\" content=\"%s\" />"
+		descriptionHTML = fmt.Sprintf(descriptionTemplate, html.EscapeString(siteDescription))
+	}
+
+	return titleHTML + descriptionHTML
+}