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// 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 (
"encoding/json"
"io"
"net/http"
"path/filepath"
"github.com/thousandeyes/shoelaces/internal/utils"
)
// TemplateHandler handles templated config files
type TemplateHandler struct{}
// TemplateHandler is the dynamic configuration provider endpoint. It
// receives a key and maybe an environment.
func (t *TemplateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
variablesMap := map[string]interface{}{}
configName := filepath.Clean(r.URL.Path)
if configName == "" {
http.Error(w, "No template name provided", http.StatusNotFound)
return
}
for key, val := range r.URL.Query() {
variablesMap[key] = val[0]
}
env := envFromRequest(r)
envName := envNameFromRequest(r)
variablesMap["baseURL"] = utils.BaseURLforEnvName(env.BaseURL, envName)
configString, err := env.Templates.RenderTemplate(env.Logger, configName, variablesMap, envName)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
} else {
io.WriteString(w, configString)
}
}
// TemplateHandler returns a TemplateHandler instance implementing http.Handler
func TemplateServer() *TemplateHandler {
return &TemplateHandler{}
}
// GetTemplateParams receives a script name and returns the parameters
// required for completing that template.
func GetTemplateParams(w http.ResponseWriter, r *http.Request) {
var vars []string
env := envFromRequest(r)
filterBlacklist := func(s string) bool {
return !utils.StringInSlice(s, env.ParamsBlacklist)
}
script := r.URL.Query().Get("script")
if script == "" {
http.Error(w, "Required script parameter", http.StatusInternalServerError)
return
}
envName := r.URL.Query().Get("environment")
if envName == "" {
envName = "default"
}
vars = utils.Filter(env.Templates.ListVariables(script, envName), filterBlacklist)
marshaled, err := json.Marshal(vars)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(marshaled)
}
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