func DBLog(db ab.DB, ec *ab.EntityController, logtype, message string) error {
l := &Log{
Type: logtype,
Message: message,
Created: time.Now(),
}
return ec.Insert(db, l)
}
func screeningService(ec *ab.EntityController) ab.Service {
res := ab.EntityResource(ec, &Screening{}, ab.EntityResourceConfig{
DisablePost: true,
DisableList: true,
DisableGet: true,
DisablePut: true,
DisableDelete: true,
})
res.ExtraEndpoints = func(srv *ab.Server) error {
srv.Post("/api/walkthrough/:id/screening", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
wid := ab.GetParams(r).ByName("id")
data := []string{}
ab.MustDecode(r, &data)
db := ab.GetDB(r)
uid := ab.GetSession(r)["uid"]
userEntity, err := ec.Load(db, "user", uid)
ab.MaybeFail(http.StatusInternalServerError, err)
user := userEntity.(*User)
wt, err := LoadActualRevision(db, ec, wid)
ab.MaybeFail(http.StatusBadRequest, err)
if wt.UID != uid && !user.Admin {
ab.Fail(http.StatusForbidden, nil)
}
if len(data) == 0 || len(data) != len(wt.Steps)-1 {
ab.Fail(http.StatusBadRequest, fmt.Errorf("got %d images, expected: %d", len(data), len(wt.Steps)-1))
}
screening := &Screening{
WID: wid,
UID: uid,
Steps: uint(len(wt.Steps) - 1),
Created: time.Now(),
Published: true,
}
err = ec.Insert(db, screening)
ab.MaybeFail(http.StatusInternalServerError, err)
images := map[string][]byte{}
for i, d := range data {
if d == "" {
continue
}
dataurl, err := dataurl.DecodeString(d)
if err != nil {
ab.LogTrace(r).Printf("data url error: %s", dataurl)
ab.Fail(http.StatusBadRequest, err)
}
if dataurl.ContentType() != "image/png" {
ab.Fail(http.StatusBadRequest, errors.New("not a png"))
}
fn := screening.ScreenshotPath(uint(i))
images[fn] = dataurl.Data
}
if len(images) == 0 {
ab.Fail(http.StatusBadRequest, errors.New("no images sent"))
}
for name, content := range images {
if err := ioutil.WriteFile(name, content, 0644); err != nil {
ab.LogUser(r).Println(err)
}
}
ab.Render(r).
SetCode(http.StatusCreated).
JSON(screening)
}), userLoggedInMiddleware)
lock := map[string]chan struct{}{}
var mtx sync.Mutex
srv.Get("/api/walkthrough/:id/screening", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
wid := ab.GetParams(r).ByName("id")
db := ab.GetDB(r)
screening, err := LoadActualScreeningForWalkthrough(db, ec, wid)
ab.MaybeFail(http.StatusInternalServerError, err)
if screening == nil {
ab.Fail(http.StatusNotFound, nil)
}
fn := screening.GIFPath()
reply := func() {
filelist := make([]string, int(screening.Steps))
for i := uint(0); i < screening.Steps; i++ {
filelist[i] = "/" + screening.ScreenshotPath(i)
}
ab.Render(r).AddOffer("image/gif", func(w http.ResponseWriter) {
f, err := os.Open(fn)
ab.MaybeFail(http.StatusInternalServerError, err)
defer f.Close()
io.Copy(w, f)
}).JSON(filelist)
}
if _, err := os.Stat(fn); err == nil {
reply()
return
}
// Short-circuits the gif generation process.
// If the client wants JSON, there is no need
// to go through the GIF generation, which is
// an expensive process.
if r.Header.Get("Accept") == "application/json" {
reply()
return
}
mtx.Lock()
l, ok := lock[fn]
if ok {
mtx.Unlock()
select {
case <-l:
reply()
case <-time.After(5 * time.Second):
w.Header().Set("Retry-After", "30")
ab.Render(r).SetCode(http.StatusServiceUnavailable)
}
return
}
l = make(chan struct{})
lock[fn] = l
mtx.Unlock()
err = screening.createGIF(false)
defer func() {
mtx.Lock()
delete(lock, fn)
mtx.Unlock()
}()
if err != nil {
if _, ok := err.(*os.PathError); ok {
ab.Fail(http.StatusNotFound, err)
} else {
ab.Fail(http.StatusInternalServerError, err)
}
}
close(l)
reply()
}))
return nil
}
return res
}