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responses.go
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responses.go
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package httpadapters
import (
"encoding/json"
"errors"
"log"
"net/http"
"github.com/raulinoneto/transactions-routines/internal/apierror"
)
type Error struct {
Code string `json:"code"`
Message string `json:"message"`
Error string `json:"error,omitempty"`
Errors []string `json:"errors,omitempty"`
Stack []apierror.Stack `json:"stack"`
}
type Payload struct {
*Error `json:"error,omitempty"`
Data interface{} `json:"data,omitempty"`
}
type Response struct {
StatusCode int `json:"status_code"`
Data interface{} `json:"data"`
}
func writeResponse(status int, body []byte, w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Credentials", "true")
w.Header().Set("Access-Control-Allow-Origin-Type", "*")
w.Header().Set("Access-Control-Allow-Headers", "Access-Control-Allow-Headers")
w.WriteHeader(status)
if _, err := w.Write(body); err != nil {
log.Fatalln(err.Error())
}
}
func BuildCreatedResponse(result interface{}, apierr error, w http.ResponseWriter) {
BuildResponse(result, apierr, http.StatusCreated, w)
}
func BuildOkResponse(result interface{}, apierr error, w http.ResponseWriter) {
BuildResponse(result, apierr, http.StatusOK, w)
}
func BuildUnauthorizedResponse(w http.ResponseWriter) {
payload := new(Payload)
payload.Error = &Error{
Code: "not_authorized",
Message: "Not Authorized",
}
payloadJson, err := json.Marshal(payload)
if err != nil {
asError(
errors.New("Something are wrong in your body, please verify "),
http.StatusBadRequest,
w,
)
return
}
writeResponse(
http.StatusUnauthorized,
payloadJson,
w,
)
}
func BuildBadRequestResponse(err error, w http.ResponseWriter) {
payload := new(Payload)
payload.Error = &Error{
Code: "bad_request",
Message: err.Error(),
}
payloadJson, err := json.Marshal(payload)
if err != nil {
asError(
errors.New("Something are wrong in your body, please verify "),
http.StatusBadRequest,
w,
)
return
}
writeResponse(
http.StatusBadRequest,
payloadJson,
w,
)
}
func BuildBadRequestResponseWithErrorArray(apierrs []*apierror.ApiError, code, message string, w http.ResponseWriter) {
payload := new(Payload)
payload.Error = &Error{
Code: code,
Message: message,
Errors: getErrMessages(apierrs),
}
payloadJson, err := json.Marshal(payload)
if err != nil {
asError(
errors.New("Something are wrong in your body, please verify "),
http.StatusBadRequest,
w,
)
return
}
writeResponse(
http.StatusBadRequest,
payloadJson,
w,
)
}
func BuildResponse(result interface{}, apierr error, status int, w http.ResponseWriter) {
if apierr != nil {
asError(apierr, http.StatusInternalServerError, w)
return
}
response := &Response{
StatusCode: status,
Data: result,
}
responseJson, err := json.Marshal(response)
if err != nil {
asError(apierr, status, w)
return
}
writeResponse(status, responseJson, w)
}
func getErrMessages(errs []*apierror.ApiError) []string {
errMessages := make([]string, 0)
for _, err := range errs {
if err != nil {
errMessages = append(errMessages, err.Error())
}
}
return errMessages
}
func asError(err error, status int, w http.ResponseWriter) {
payload := new(Payload)
switch err.(type) {
case *apierror.ApiError:
apierr := err.(*apierror.ApiError)
payload.Error = &Error{
Code: apierr.Code,
Message: apierr.Message,
Error: apierr.Error(),
Stack: apierror.GetStack(apierr),
}
status = apierr.HttpStatusCode
default:
payload.Error = &Error{
Code: "generic.internal_error",
Message: "an internal error occurred",
Error: err.Error(),
Stack: nil,
}
}
payloadJson, err := json.Marshal(payload)
if err != nil {
log.Fatalln(err.Error())
}
writeResponse(status, payloadJson, w)
}