Feature: Trusted Types support (#64975)

* Draft: Feature: Trusted Types support

* remove trusted-types package

* Create policy before jQuery and Angular is loaded and add feature flag

* Add trustedTypePolicies

* Sanitize scriptURL

* Add TT meta tag for test env

* Move trusted types into core

* Add DOMParser support for TrustedHTML

* Seperate RSS sanitization and add better TrustedHTML support

* Get test CSP header from config

* Remove dompurify dep from core

* Add documentation for trusted types

* Apply suggestions from code review

Co-authored-by: Kristian Bremberg <114284895+KristianGrafana@users.noreply.github.com>

* Add comment about Github discussion thread and things breaking

* Remove changes from News panel

* Remove TT feature toggle

* Expose TT and CSPReportOnly to frontend

* Log errors in console when CSP report only is enabled

* Log error for reporting and remove test mode

* Only insert CSP header in HTML for dev env

* Update docs

---------

Co-authored-by: Tobias Skarhed <tobias.skarhed@gmail.com>
Co-authored-by: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>

pkg/api/index.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/grafana/grafana/pkg/api/dtos"
+	"github.com/grafana/grafana/pkg/middleware"
 	ac "github.com/grafana/grafana/pkg/services/accesscontrol"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
 	"github.com/grafana/grafana/pkg/services/dashboards"
@@ -139,6 +140,12 @@ func (hs *HTTPServer) setIndexViewData(c *contextmodel.ReqContext) (*dtos.IndexV
 		Nonce:                               c.RequestNonce,
 		ContentDeliveryURL:                  hs.Cfg.GetContentDeliveryURL(hs.License.ContentDeliveryPrefix()),
 		LoadingLogo:                         "public/img/grafana_icon.svg",
+		IsDevelopmentEnv:                    hs.Cfg.Env == setting.Dev,
+	}
+
+	if hs.Cfg.CSPEnabled {
+		data.CSPEnabled = true
+		data.CSPContent = middleware.ReplacePolicyVariables(hs.Cfg.CSPTemplate, appURL, c.RequestNonce)
 	}
 
 	if !hs.AccessControl.IsDisabled() {