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api_response.go
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api_response.go
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package util
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
)
type HTTPError struct {
Code int
Text string
}
func (e HTTPError) Error() string {
return e.Text
}
func acceptVersion(req *http.Request) int {
if req.Header.Get("accept") == "application/vnd.nsq; version=1.0" {
return 1
}
return 0
}
func POSTRequired(req *http.Request, f func() (interface{}, error)) func() (interface{}, error) {
if req.Method != "POST" {
return func() (interface{}, error) {
return nil, HTTPError{405, "INVALID_REQUEST"}
}
}
return f
}
func NegotiateAPIResponseWrapper(w http.ResponseWriter, req *http.Request, f func() (interface{}, error)) {
data, err := f()
if err != nil {
if acceptVersion(req) == 1 {
V1ApiResponse(w, err.(HTTPError).Code, err)
} else {
// this handler always returns 500 for backwards compatibility
ApiResponse(w, 500, err.Error(), nil)
}
return
}
if acceptVersion(req) == 1 {
V1ApiResponse(w, 200, data)
} else {
ApiResponse(w, 200, "OK", data)
}
}
func V1APIResponseWrapper(w http.ResponseWriter, req *http.Request, f func() (interface{}, error)) {
data, err := f()
if err != nil {
V1ApiResponse(w, err.(HTTPError).Code, err)
return
}
V1ApiResponse(w, 200, data)
}
func ApiResponse(w http.ResponseWriter, statusCode int, statusTxt string, data interface{}) {
var response []byte
var err error
switch data.(type) {
case string:
response = []byte(data.(string))
case []byte:
response = data.([]byte)
default:
w.Header().Set("Content-Type", "application/json; charset=utf-8")
response, err = json.Marshal(struct {
StatusCode int `json:"status_code"`
StatusTxt string `json:"status_txt"`
Data interface{} `json:"data"`
}{
statusCode,
statusTxt,
data,
})
if err != nil {
response = []byte(fmt.Sprintf(`{"status_code":500, "status_txt":"%s", "data":null}`, err))
}
}
w.Header().Set("Content-Length", strconv.Itoa(len(response)))
w.WriteHeader(statusCode)
w.Write(response)
}
func V1ApiResponse(w http.ResponseWriter, code int, data interface{}) {
var response []byte
var err error
var isJson bool
if code == 200 {
switch data.(type) {
case string:
response = []byte(data.(string))
case []byte:
response = data.([]byte)
case nil:
response = []byte{}
default:
isJson = true
response, err = json.Marshal(data)
if err != nil {
code = 500
data = err
}
}
}
if code != 200 {
isJson = true
response = []byte(fmt.Sprintf(`{"message":"%s"}`, data))
}
if isJson {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
}
w.Header().Set("X-NSQ-Content-Type", "nsq; version=1.0")
w.Header().Set("Content-Length", strconv.Itoa(len(response)))
w.WriteHeader(code)
w.Write(response)
}