Initial commit

backend/pkgs/server/response.go

@@ -0,0 +1,61 @@
+package server
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+)
+
+// Respond converts a Go value to JSON and sends it to the client.
+// Adapted from https://github.com/ardanlabs/service/tree/master/foundation/web
+func Respond(w http.ResponseWriter, statusCode int, data interface{}) error {
+	// If there is nothing to marshal then set status code and return.
+	if statusCode == http.StatusNoContent {
+		w.WriteHeader(statusCode)
+		return nil
+	}
+
+	// Convert the response value to JSON.
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	// Set the content type and headers once we know marshaling has succeeded.
+	w.Header().Set("Content-Type", "application/json")
+
+	// Write the status code to the response.
+	w.WriteHeader(statusCode)
+
+	// Send the result back to the client.
+	if _, err := w.Write(jsonData); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// ResponseError is a helper function that sends a JSON response of an error message
+func RespondError(w http.ResponseWriter, statusCode int, err error) {
+	eb := ErrorBuilder{}
+	eb.AddError(err)
+	eb.Respond(w, statusCode)
+}
+
+// RespondInternalServerError is a wrapper around RespondError that sends a 500 internal server error. Useful for
+// Sending generic errors when everything went wrong.
+func RespondInternalServerError(w http.ResponseWriter) {
+	RespondError(w, http.StatusInternalServerError, errors.New("internal server error"))
+}
+
+// RespondNotFound is a helper utility for responding with a generic
+// "unauthorized" error.
+func RespondUnauthorized(w http.ResponseWriter) {
+	RespondError(w, http.StatusUnauthorized, errors.New("unauthorized"))
+}
+
+// RespondForbidden is a helper utility for responding with a generic
+// "forbidden" error.
+func RespondForbidden(w http.ResponseWriter) {
+	RespondError(w, http.StatusForbidden, errors.New("forbidden"))
+}