http_utility.go
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package restutility
import (
"net/http"
"encoding/json"
)
var _apiVersion = ""
var _authEndPoint = ""
func SetApiVersion(ver string) string {
_apiVersion = ver
return _apiVersion
}
func SetAuthEndpoint(ep string) {
_authEndPoint = ep
}
////
//// ERROR UTILITY
////
const templateHttpErr500_EN = "An internal server error has occurred."
const templateHttpErr500_RS = "Došlo je do greške na serveru."
const templateHttpErr400_EN = "Bad request: invalid request body."
const templateHttpErr400_RS = "Neispravan zahtev."
type HttpError struct {
Error []HttpErrorDesc `json:"error"`
Request string `json:"request"`
}
type HttpErrorDesc struct {
Lang string `json:"lang"`
Desc string `json:"description"`
}
func RespondWithHttpError(w http.ResponseWriter,
req *http.Request,
code int,
httpErr []HttpErrorDesc) {
err := HttpError{
Error: httpErr,
Request: req.Method + " " + req.URL.Path,
}
w.WriteHeader(code)
json.NewEncoder(w).Encode(err)
}
func RespondWithHttpError400(w http.ResponseWriter, req *http.Request) {
RespondWithHttpError(w, req, http.StatusBadRequest, []HttpErrorDesc{
{Lang: "en", Desc: templateHttpErr400_EN},
{Lang: "rs", Desc: templateHttpErr400_RS},
})
}
func RespondWithHttpError500(w http.ResponseWriter, req *http.Request) {
RespondWithHttpError(w, req, http.StatusInternalServerError, []HttpErrorDesc{
{Lang: "en", Desc: templateHttpErr500_EN},
{Lang: "rs", Desc: templateHttpErr500_RS},
})
}
////
//// HANDLER FUNC WRAPPER
////
//TODO: Add parameters to enable/disable token and roles authorization checks
// Sets common headers and checks for token validity.
func ProcessHeaders(fn http.HandlerFunc, authEnabled bool) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
// @TODO: check Content-type header (must be application/json)
// ctype := w.Header.Get("Content-Type")
// if req.Method != "GET" && ctype != "application/json" {
// replyWithHttpError(w, req, http.StatusBadRequest,
// "Not a supported content type: " + ctype)
// }
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods",
`POST,
GET,
PUT,
DELETE,
OPTIONS`)
w.Header().Set("Access-Control-Allow-Headers",
`Accept,
Content-Type,
Content-Length,
Accept-Encoding,
X-CSRF-Token,
Authorization`)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if req.Method == "OPTIONS" {
return
}
if authEnabled {
if req.URL.Path != _apiVersion + _authEndPoint {
token := req.Header.Get("Authorization")
if _, err := ParseAPIToken(token); err != nil {
RespondWithHttpError(w, req, http.StatusUnauthorized,
[]HttpErrorDesc{
{Lang: "en", Desc: "Unauthorized request."},
{Lang: "rs", Desc: "Neautorizovani zahtev."},
})
return
}
}
}
err := req.ParseForm()
if err != nil {
RespondWithHttpError(w, req, http.StatusBadRequest,
[]HttpErrorDesc{
{Lang: "en", Desc: templateHttpErr400_EN},
{Lang: "rs", Desc: templateHttpErr400_RS},
})
return
}
// execute HandlerFunc
fn(w, req)
}
}
////
//// NOT FOUND HANDLER
////
func NotFoundHandler(w http.ResponseWriter, req *http.Request) {
RespondWithHttpError(w, req, http.StatusNotFound, []HttpErrorDesc{
{Lang: "en", Desc: "Not found."},
{Lang: "rs", Desc: "Traženi resurs ne postoji."},
})
}