blob: a20d2fdefa5f7316a9f2d46aaaaeb7563fff03bd [file] [log] [blame]
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"html/template"
"io"
"log"
"mime"
"net/http"
"os"
"path"
"path/filepath"
"github.com/golang/protobuf/proto"
reluipb "golang.org/x/build/cmd/relui/protos"
)
// fileServerHandler returns a http.Handler rooted at root. It will call the next handler provided for requests to "/".
//
// The returned handler sets the appropriate Content-Type and Cache-Control headers for the returned file.
func fileServerHandler(root string, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
next.ServeHTTP(w, r)
return
}
// http.FileServer would correctly return a 404, but we need to check that the file exists
// before calculating the Content-Type header.
if _, err := os.Stat(path.Join(root, r.URL.Path)); os.IsNotExist(err) {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", mime.TypeByExtension(path.Ext(r.URL.Path)))
w.Header().Set("Cache-Control", "no-cache, private, max-age=0")
fs := http.FileServer(http.Dir(root))
fs.ServeHTTP(w, r)
})
}
var (
homeTmpl = template.Must(template.Must(layoutTmpl.Clone()).ParseFiles(relativeFile("templates/home.html")))
layoutTmpl = template.Must(template.ParseFiles(relativeFile("templates/layout.html")))
newWorkflowTmpl = template.Must(template.Must(layoutTmpl.Clone()).ParseFiles(relativeFile("templates/new_workflow.html")))
)
// server implements the http handlers for relui.
type server struct {
// configs are all configured release workflows.
configs []*reluipb.Workflow
// store is for persisting application state.
store store
}
type homeResponse struct {
Workflows []*reluipb.Workflow
}
// homeHandler renders the homepage.
func (s *server) homeHandler(w http.ResponseWriter, _ *http.Request) {
out := bytes.Buffer{}
if err := homeTmpl.Execute(&out, homeResponse{Workflows: s.store.Workflows()}); err != nil {
log.Printf("homeHandler: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
io.Copy(w, &out)
}
// newWorkflowHandler presents a form for creating a new workflow.
func (s *server) newWorkflowHandler(w http.ResponseWriter, _ *http.Request) {
out := bytes.Buffer{}
if err := newWorkflowTmpl.Execute(&out, nil); err != nil {
log.Printf("newWorkflowHandler: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
io.Copy(w, &out)
}
// createWorkflowHandler persists a new workflow in the datastore.
func (s *server) createWorkflowHandler(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
return
}
ref := r.Form.Get("workflow.revision")
if ref == "" {
// TODO(golang.org/issue/40279) - render a better error in the form.
http.Error(w, "workflow revision is required", http.StatusBadRequest)
return
}
if len(s.configs) == 0 {
http.Error(w, "Unable to create workflow: no workflows configured", http.StatusInternalServerError)
return
}
// Always create the first workflow for now, until we have more.
wf := proto.Clone(s.configs[0]).(*reluipb.Workflow)
if wf.GetParams() == nil {
wf.Params = map[string]string{}
}
wf.Params["GitObject"] = ref
if err := s.store.AddWorkflow(wf); err != nil {
log.Printf("Error adding workflow: s.store.AddWorkflow(%v) = %v", wf, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/", http.StatusSeeOther)
}
// relativeFile returns the path to the provided file or directory,
// conditionally prepending a relative path depending on the environment.
//
// In tests the current directory is ".", but the command may be running from the module root.
func relativeFile(base string) string {
// Check to see if it is in "." first.
if _, err := os.Stat(base); err == nil {
return base
}
return filepath.Join("cmd/relui", base)
}