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mp-sdk.go
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mp-sdk.go
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package mercadopago
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
"strings"
)
// General API configuration values
const (
MPVersion string = "0.1"
MPUserAgent string = "MercadoPago Go SDK v" + MPVersion
APIBaseURL string = "https://api.mercadopago.com"
MIMEJSON string = "application/json"
MIMEForm string = "application/x-www-form-urlencoded"
)
// MP is the implementation to consume Mercado Pago API services
type MP struct {
CustomAccessToken string
BasicAccessToken string
ClientID string
clientSecret string
Sandbox bool
Debug bool
}
// TokenResponse is the structure of data obtained from the MP Auth Token service
type TokenResponse struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
LiveMode bool `json:"live_mode"`
UserID int32 `json:"user_id"`
TokenType string `json:"token_type"`
ExpiresIn int32 `json:"expires_in"`
Scope string `json:"scope"`
}
// NewMP returns a new instance of the MP service library
func NewMP(clientID string, clientSecret string, customAccessToken string, sandbox bool, debug bool) MP {
mp := MP{}
mp.BasicAccessToken = ""
mp.CustomAccessToken = customAccessToken
mp.ClientID = clientID
mp.clientSecret = clientSecret
mp.Sandbox = sandbox
mp.Debug = debug
return mp
}
// GetAccessToken returns an Access Token obtained from MP API
func (mp *MP) GetAccessToken() (string, error) {
if mp.BasicAccessToken == "" {
err := mp.obtainAccessToken()
if err != nil {
return "", err
}
}
return mp.BasicAccessToken, nil
}
func (mp *MP) obtainAccessToken() error {
data := &url.Values{}
data.Set("client_id", mp.ClientID)
data.Add("client_secret", mp.clientSecret)
data.Add("grant_type", "client_credentials")
r, err := mp.restFormCall("POST", "/oauth/token", data, 0)
if err != nil {
return err
}
// Check response status
if r.StatusCode != 200 && r.StatusCode != 201 {
return fmt.Errorf("Bad status received in HTTP response: %v", r.Status)
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
var token TokenResponse
if err = json.Unmarshal(body, &token); err != nil {
return err
}
mp.BasicAccessToken = token.AccessToken
return nil
}
// GET HTTP method wrapper for authentication (Form)
func (mp *MP) get(resource string, values *url.Values, auth int) (*http.Response, error) {
return mp.restFormCall("GET", resource, values, auth)
}
// JGET HTTP method wrapper for authentication (JSON)
func (mp *MP) jget(resource string, data interface{}, auth int) (*http.Response, error) {
dataBuffer := new(bytes.Buffer)
if data != nil {
json.NewEncoder(dataBuffer).Encode(data)
}
return mp.restJSONCall("GET", resource, dataBuffer, auth)
}
// POST HTTP method wrapper for authentication (JSON)
func (mp *MP) post(resource string, data interface{}, auth int) (*http.Response, error) {
dataBuffer := new(bytes.Buffer)
if data != nil {
json.NewEncoder(dataBuffer).Encode(data)
}
return mp.restJSONCall("POST", resource, dataBuffer, auth)
}
// PUT HTTP method wrapper for authentication (JSON)
func (mp *MP) put(resource string, data interface{}, auth int) (*http.Response, error) {
dataBuffer := new(bytes.Buffer)
if data != nil {
json.NewEncoder(dataBuffer).Encode(data)
}
return mp.restJSONCall("PUT", resource, dataBuffer, auth)
}
// generic API REST call with Mercado Pago preferences
func (mp *MP) restFormCall(method string, resource string, values *url.Values, auth int) (*http.Response, error) {
// Build resource URL
u, err := url.ParseRequestURI(APIBaseURL)
if err != nil {
return nil, err
}
u.Path = resource
urlStr := fmt.Sprintf("%v", u)
// If no values passed, then initialize an empty object
if values == nil {
values = &url.Values{}
}
// If authed method, then add a form entry for the MP Access Token (Basic Workflow)
if auth == 1 {
if mp.BasicAccessToken == "" {
err := mp.obtainAccessToken()
if err != nil {
return nil, err
}
}
values.Add("access_token", mp.BasicAccessToken)
}
// If authed method, then add a form entry for the MP Access Token (Custom Workflow)
if auth == 2 {
values.Add("access_token", mp.CustomAccessToken)
}
// Create HTTP Request
r, _ := http.NewRequest(method, urlStr, bytes.NewBufferString(values.Encode()))
if err == nil {
r.Header.Add("Content-Length", strconv.Itoa(len(values.Encode())))
r.Header.Set("User-Agent", MPUserAgent)
r.Header.Add("accept", MIMEJSON)
r.Header.Add("content-type", MIMEForm)
// DEBUG only - Print full request
if mp.Debug {
debug(httputil.DumpRequestOut(r, true))
}
}
client := &http.Client{}
resp, respErr := client.Do(r)
if respErr == nil {
// DEBUG only - Print full response
if mp.Debug {
debug(httputil.DumpResponse(resp, true))
}
}
return resp, respErr
}
// generic API REST call with Mercado Pago preferences
func (mp *MP) restJSONCall(method string, resource string, data *bytes.Buffer, auth int) (*http.Response, error) {
// Build resource URL
u, err := url.ParseRequestURI(APIBaseURL)
if err != nil {
return nil, err
}
u.Path = resource
urlStr := fmt.Sprintf("%v", u)
// If authed method, then add a form entry for the MP Access Token (Basic Workflow)
if auth == 1 {
if mp.BasicAccessToken == "" {
err := mp.obtainAccessToken()
if err != nil {
return nil, err
}
}
if strings.Contains(urlStr, "?") {
urlStr += "&access_token=" + mp.BasicAccessToken
} else {
urlStr += "?access_token=" + mp.BasicAccessToken
}
}
// If authed method, then add a form entry for the MP Access Token (Custom Workflow)
if auth == 2 {
if strings.Contains(urlStr, "?") {
urlStr += "&access_token=" + mp.CustomAccessToken
} else {
urlStr += "?access_token=" + mp.CustomAccessToken
}
}
// Create HTTP Request
r, err := http.NewRequest(method, urlStr, data)
if err == nil {
r.Header.Add("Content-Length", strconv.Itoa(data.Len()))
r.Header.Set("User-Agent", MPUserAgent)
r.Header.Set("Content-Type", MIMEJSON)
r.Header.Add("Accept", MIMEJSON)
// DEBUG only - Print full request
if mp.Debug {
debug(httputil.DumpRequestOut(r, true))
}
}
client := &http.Client{}
resp, respErr := client.Do(r)
if respErr == nil {
// DEBUG only - Print full response
if mp.Debug {
debug(httputil.DumpResponse(resp, true))
}
}
return resp, respErr
}
func debug(data []byte, err error) {
if err == nil {
fmt.Printf("%s\n\n", data)
} else {
log.Fatalf("%s\n\n", err)
}
}