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connector.go
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connector.go
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package bluesnap
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"reflect"
)
type Serializer interface {
ToJSON() ([]byte, error)
Method() string
}
type Deserializer interface {
FromJSON(data []byte) error
Method() string
}
type Connector struct {
Client *http.Client
url string
}
type Opts struct {
Credentials Credentials
}
type Credentials struct {
Username string
Password string
}
func New(client *http.Client, url string) Connector {
return Connector{
Client: client,
url: url,
}
}
func (c Connector) do(method, endpoint string, input Serializer, output Deserializer, opts Opts) (Errors, error) {
if reflect.ValueOf(output).Kind() != reflect.Ptr {
return emptyErrors(), errors.New("output must be a pointer")
}
var buf *bytes.Buffer = nil
if input != nil {
body, err := input.ToJSON()
if err != nil {
return emptyErrors(), err
}
buf = bytes.NewBuffer(body)
}
req, err := http.NewRequest(method, c.getURL(endpoint), buf)
if err != nil {
return emptyErrors(), err
}
req.Header.Add("Authorization", "Basic "+opts.Credentials.Parse())
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
resp, err := c.Client.Do(req)
if err != nil {
return emptyErrors(), err
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return emptyErrors(), err
}
if resp.StatusCode > 399 {
var errs Errors
if err := json.Unmarshal(respBody, &errs); err != nil {
return emptyErrors(), err
}
errs.StatusCode = resp.StatusCode
return errs, nil
}
if output != nil {
return emptyErrors(), output.FromJSON(respBody)
}
return emptyErrors(), nil
}
func (c Connector) getURL(endpoint string) string {
return c.url + endpoint
}
func (c Credentials) Parse() string {
return base64.StdEncoding.EncodeToString([]byte(c.Username + ":" + c.Password))
}