// WriteResponseObject writes the status code and response object to the HttpResponseWriter in
// the specified context, in the format best suited based on the request.
//
// Goweb uses the WebCodecService to decide which codec to use when responding
// see http://godoc.org/github.com/stretchrcom/codecs/services#WebCodecService for more information.
//
// This method should be used when the Goweb Standard Response Object does not satisfy the needs of
// the API, but other Respond* methods are recommended.
func (a *GowebAPIResponder) WriteResponseObject(ctx context.Context, status int, responseObject interface{}) error {
service := a.GetCodecService()
acceptHeader := ctx.HttpRequest().Header.Get("Accept")
extension := ctx.FileExtension()
hasCallback := len(ctx.QueryValue("callback")) > 0
codec, codecError := service.GetCodecForResponding(acceptHeader, extension, hasCallback)
if codecError != nil {
return codecError
}
var options map[string]interface{}
// do we need to add some options?
if hasCallback {
options = map[string]interface{}{constants.OptionKeyClientCallback: ctx.QueryValue("callback")}
}
output, marshalErr := codec.Marshal(responseObject, options)
if marshalErr != nil {
return marshalErr
}
// use the HTTP responder to respond
ctx.HttpResponseWriter().Header().Set("Content-Type", codec.ContentType()) // TODO: test me
a.httpResponder.With(ctx, status, output)
return nil
}
// Handle writes the error from the context into the HttpResponseWriter with a
// 500 http.StatusInternalServerError status code.
func (h *DefaultErrorHandler) Handle(ctx context.Context) (stop bool, err error) {
var handlerError HandlerError = ctx.Data().Get(DataKeyForError).(HandlerError)
hostname, _ := os.Hostname()
w := ctx.HttpResponseWriter()
// write the error out
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("<!DOCTYPE html><html><head>"))
w.Write([]byte("<style>"))
w.Write([]byte("h1 { font-size: 17px }"))
w.Write([]byte("h1 strong {text-decoration:underline}"))
w.Write([]byte("h2 { background-color: #ffd; padding: 20px }"))
w.Write([]byte("footer { margin-top: 20px; border-top:1px solid black; padding:10px; font-size:0.9em }"))
w.Write([]byte("</style>"))
w.Write([]byte("</head><body>"))
w.Write([]byte(fmt.Sprintf("<h1>Error in <code>%s</code></h1><h2>%s</h2>", handlerError.Handler, handlerError)))
w.Write([]byte(fmt.Sprintf("<h3><code>%s</code> error in Handler <code>%v</code></h3> <code><pre>%s</pre></code>", reflect.TypeOf(handlerError.OriginalError), &handlerError.Handler, handlerError.Handler)))
w.Write([]byte(fmt.Sprintf("on %s", hostname)))
w.Write([]byte("<footer>Learn more about <a href='http://github.com/stretchrcom/goweb' target='_blank'>Goweb</a></footer>"))
w.Write([]byte("</body></html>"))
// responses are actually ignored
return false, nil
}
// Before gets called before any other method.
func (r *ThingsController) Before(ctx context.Context) error {
// set a Things specific header
ctx.HttpResponseWriter().Header().Set("X-Things-Controller", "true")
return nil
}
// With writes a response to the request in the specified context.
func (r *GowebHTTPResponder) With(ctx context.Context, httpStatus int, body []byte) error {
r.WithStatus(ctx, httpStatus)
_, writeErr := ctx.HttpResponseWriter().Write(body)
return writeErr
}
// WithPermanentRedirect responds with a redirection to the specific path or URL with the
// http.StatusMovedPermanently status.
func (r *GowebHTTPResponder) WithPermanentRedirect(ctx context.Context, pathOrURLSegments ...interface{}) error {
ctx.HttpResponseWriter().Header().Set("Location", paths.PathFromSegments(pathOrURLSegments...))
return r.WithStatus(ctx, http.StatusMovedPermanently)
}
// WithStatus writes the specified HTTP Status Code to the Context's ResponseWriter.
func (r *GowebHTTPResponder) WithStatus(ctx context.Context, httpStatus int) error {
ctx.HttpResponseWriter().WriteHeader(httpStatus)
return nil
}