json.go
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package webutility
// TODO(marko): If DecodeJSON() returns io.EOF treat it as if there is no response body, since response content length can sometimes be -1.
import (
"bytes"
"encoding/json"
"io"
"net/http"
"net/url"
)
// DecodeJSON decodes JSON data from r to v.
// Returns an error if it fails.
func DecodeJSON(r io.Reader, v interface{}) error {
return json.NewDecoder(r).Decode(v)
}
func GetJSON(url string, v interface{}, params url.Values, headers http.Header) (status int, err error) {
p := params.Encode()
if p != "" {
url += "?" + p
}
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return 0, err
}
if headers != nil {
for k, head := range headers {
for i, h := range head {
if i == 0 {
req.Header.Set(k, h)
} else {
req.Header.Add(k, h)
}
}
}
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return 0, err
}
defer resp.Body.Close()
status = resp.StatusCode
if err = DecodeJSON(resp.Body, v); err == io.EOF {
err = nil
}
return status, err
}
func PostJSON(url string, v, r interface{}, params url.Values, headers http.Header) (status int, err error) {
buffer := bytes.NewBuffer(make([]byte, 0))
json.NewEncoder(buffer).Encode(v)
p := params.Encode()
if p != "" {
url += "?" + p
}
req, err := http.NewRequest(http.MethodPost, url, buffer)
if err != nil {
return 0, err
}
if headers != nil {
for k, head := range headers {
for i, h := range head {
if i == 0 {
req.Header.Set(k, h)
} else {
req.Header.Add(k, h)
}
}
}
}
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return 0, err
}
status = resp.StatusCode
defer resp.Body.Close()
if err = DecodeJSON(resp.Body, v); err == io.EOF {
err = nil
}
return status, err
}