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response_writer.go
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/
response_writer.go
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package v2
import (
"encoding/json"
"net/http"
"github.com/elysiumstation/fury/libs/jsonrpc"
)
// responseWriter is a wrapper used to easily track response information written
// to the HTTP response writer, without polluting the handler's code.
type responseWriter struct {
writer http.ResponseWriter
// traceID holds a unique identifier of the incoming request. It's used to
// trace everything related to that request. It's used on a "technical"
// level for tracing the request through multiple components, and services.
// It shouldn't be confused with the requestID that is an optional
// identifier set by the client.
traceID string
// statusCode holds the latest status code set on the writer.
statusCode int
// internalError holds the error that came up during processing of the
// request or the response.
internalError error
// response holds the body of the response.
response []byte
// requestID is the identifier the client set in the request. It's used by
// the client to track its requests. This identifier can be empty. It
// shouldn't be confused with the traceID.
requestID string
}
func (lw *responseWriter) SetStatusCode(statusCode int) {
lw.statusCode = statusCode
lw.writer.WriteHeader(statusCode)
if lw.statusCode == 401 {
lw.writer.Header().Set("WWW-Authenticate", "VWT")
}
}
func (lw *responseWriter) SetAuthorization(vwt VWT) {
lw.writer.Header().Set("Authorization", vwt.String())
lw.writer.Header().Set("Access-Control-Allow-Headers", "Authorization")
lw.writer.Header().Set("Access-Control-Expose-Headers", "Authorization")
}
func (lw *responseWriter) WriteHTTPResponse(response *Response) {
lw.writer.Header().Set("Content-Type", "application/json")
marshaledResponse, err := json.Marshal(response)
if err != nil {
lw.SetStatusCode(http.StatusInternalServerError)
lw.response = nil
lw.internalError = err
return
}
if _, err = lw.writer.Write(marshaledResponse); err != nil {
lw.SetStatusCode(http.StatusInternalServerError)
lw.response = nil
lw.internalError = err
return
}
}
func (lw *responseWriter) WriteJSONRPCResponse(response *jsonrpc.Response) {
lw.requestID = response.ID
lw.writer.Header().Set("Content-Type", "application/json-rpc")
marshaledResponse, err := json.Marshal(response)
if err != nil {
lw.SetStatusCode(http.StatusInternalServerError)
lw.response = nil
lw.internalError = err
return
}
if _, err = lw.writer.Write(marshaledResponse); err != nil {
lw.SetStatusCode(http.StatusInternalServerError)
lw.response = nil
lw.internalError = err
return
}
}
func newResponseWriter(writer http.ResponseWriter, traceID string) *responseWriter {
writer.Header().Set("Content-Type", "application/json")
return &responseWriter{
writer: writer,
traceID: traceID,
}
}