/
jsonp.go
98 lines (90 loc) · 2.45 KB
/
jsonp.go
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package sockjs
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
)
func (h *Handler) jsonp(rw http.ResponseWriter, req *http.Request) {
rw.Header().Set("content-type", "application/javascript; charset=UTF-8")
if err := req.ParseForm(); err != nil {
http.Error(rw, err.Error(), http.StatusBadRequest)
return
}
callback := req.Form.Get("c")
if callback == "" {
http.Error(rw, `"callback" parameter required`, http.StatusInternalServerError)
return
} else if invalidCallback.MatchString(callback) {
http.Error(rw, `invalid character in "callback" parameter`, http.StatusBadRequest)
return
}
rw.WriteHeader(http.StatusOK)
rw.(http.Flusher).Flush()
sess, err := h.sessionByRequest(req)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
recv := newHTTPReceiver(rw, req, 1, &jsonpFrameWriter{callback}, ReceiverTypeJSONP)
if err := sess.attachReceiver(recv); err != nil {
if err := recv.sendFrame(cFrame); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
recv.close()
return
}
sess.startHandlerOnce.Do(func() { go h.handlerFunc(Session{sess}) })
select {
case <-recv.doneNotify():
case <-recv.interruptedNotify():
}
}
func (h *Handler) jsonpSend(rw http.ResponseWriter, req *http.Request) {
if err := req.ParseForm(); err != nil {
http.Error(rw, err.Error(), http.StatusBadRequest)
return
}
var data io.Reader
data = req.Body
formReader := strings.NewReader(req.PostFormValue("d"))
if formReader.Len() != 0 {
data = formReader
}
if data == nil {
http.Error(rw, "Payload expected.", http.StatusBadRequest)
return
}
var messages []string
err := json.NewDecoder(data).Decode(&messages)
if err == io.EOF {
http.Error(rw, "Payload expected.", http.StatusBadRequest)
return
}
if err != nil {
http.Error(rw, "Broken JSON encoding.", http.StatusBadRequest)
return
}
sessionID, _ := h.parseSessionID(req.URL)
h.sessionsMux.Lock()
sess, ok := h.sessions[sessionID]
h.sessionsMux.Unlock()
if !ok {
http.NotFound(rw, req)
} else {
if err := sess.accept(messages...); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
rw.Header().Set("content-type", "text/plain; charset=UTF-8")
_, _ = rw.Write([]byte("ok"))
}
}
type jsonpFrameWriter struct {
callback string
}
func (j *jsonpFrameWriter) write(w io.Writer, frame string) (int, error) {
return fmt.Fprintf(w, "%s(%s);\r\n", j.callback, quote(frame))
}