First public commit

1 files changed, 75 insertions, 0 deletions

diff --git a/internal/handlers/common.go b/internal/handlers/common.go
new file mode 100644
index 0000000..99511e2
--- /dev/null
+++ b/internal/handlers/common.go
@@ -0,0 +1,75 @@
+// Copyright 2018 ThousandEyes Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package handlers
+
+import (
+	"html/template"
+	"net/http"
+
+	"github.com/thousandeyes/shoelaces/internal/environment"
+	"github.com/thousandeyes/shoelaces/internal/ipxe"
+	"github.com/thousandeyes/shoelaces/internal/mappings"
+)
+
+// DefaultTemplateRenderer holds information for rendering a template based
+// on its name. It implements the http.Handler interface.
+type DefaultTemplateRenderer struct {
+	templateName string
+}
+
+// RenderDefaultTemplate renders a template by the given name
+func RenderDefaultTemplate(name string) *DefaultTemplateRenderer {
+	return &DefaultTemplateRenderer{templateName: name}
+}
+
+func (t *DefaultTemplateRenderer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	env := envFromRequest(r)
+	tpl := env.StaticTemplates
+	// XXX: Probably not ideal as it's doing the directory listing on every request
+	ipxeScripts := ipxe.ScriptList(env)
+	tplVars := struct {
+		BaseURL      string
+		HostnameMaps *[]mappings.HostnameMap
+		NetworkMaps  *[]mappings.NetworkMap
+		Scripts      *[]ipxe.Script
+	}{
+		env.BaseURL,
+		&env.HostnameMaps,
+		&env.NetworkMaps,
+		&ipxeScripts,
+	}
+	renderTemplate(w, tpl, "header", tplVars)
+	renderTemplate(w, tpl, t.templateName, tplVars)
+	renderTemplate(w, tpl, "footer", tplVars)
+}
+
+func renderTemplate(w http.ResponseWriter, tpl *template.Template, tmpl string, d interface{}) {
+	err := tpl.ExecuteTemplate(w, tmpl, d)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func envFromRequest(r *http.Request) *environment.Environment {
+	return r.Context().Value(ShoelacesEnvCtxID).(*environment.Environment)
+}
+
+func envNameFromRequest(r *http.Request) string {
+	e := r.Context().Value(ShoelacesEnvNameCtxID)
+	if e != nil {
+		return e.(string)
+	}
+	return ""
+}