feat: add templates delete command (#1443)

coderd/httpmw/templateparam.go

@@ -45,6 +45,13 @@ func ExtractTemplateParam(db database.Store) func(http.Handler) http.Handler {
 				return
 			}
 
+			if template.Deleted {
+				httpapi.Write(rw, http.StatusNotFound, httpapi.Response{
+					Message: fmt.Sprintf("template %q does not exist", templateID),
+				})
+				return
+			}
+
 			ctx := context.WithValue(r.Context(), templateParamContextKey{}, template)
 			chi.RouteContext(ctx).URLParams.Add("organization", template.OrganizationID.String())
 			next.ServeHTTP(rw, r.WithContext(ctx))

coderd/templates.go

@@ -18,6 +18,7 @@ import (
 // Returns a single template.
 func (api *api) template(rw http.ResponseWriter, r *http.Request) {
 	template := httpmw.TemplateParam(r)
+
 	workspaceCounts, err := api.Database.GetWorkspaceOwnerCountsByTemplateIDs(r.Context(), []uuid.UUID{template.ID})
 	if errors.Is(err, sql.ErrNoRows) {
 		err = nil