Feature/oauth implementation

examples/apis/oauth/create/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/mercadopago/sdk-go/pkg/config"
+	"github.com/mercadopago/sdk-go/pkg/oauth"
+)
+
+func main() {
+	accessToken := "{{ACCESS_TOKEN}}"
+
+	cfg, err := config.New(accessToken)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	client := oauth.NewClient(cfg)
+	authorizationCode := "{{AUTHORIZATION_CODE}}"
+	redirectURI := "{{REDIRECT_URI}}"
+
+	cred, err := client.Create(context.Background(), authorizationCode, redirectURI)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(cred)
+}

examples/apis/oauth/getauthorizationurl/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/mercadopago/sdk-go/pkg/config"
+	"github.com/mercadopago/sdk-go/pkg/oauth"
+)
+
+func main() {
+	accessToken := "{{ACCESS_TOKEN}}"
+
+	cfg, err := config.New(accessToken)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	client := oauth.NewClient(cfg)
+
+	clientID := "{{CLIENT_ID}}"
+	redirectURI := "{{REDIRECT_URI}}"
+	state := "state"
+
+	url := client.GetAuthorizationURL(clientID, redirectURI, state)
+
+	fmt.Println(url)
+}

examples/apis/oauth/refresh/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/mercadopago/sdk-go/pkg/config"
+	"github.com/mercadopago/sdk-go/pkg/oauth"
+)
+
+func main() {
+	accessToken := "{{ACCESS_TOKEN}}"
+
+	cfg, err := config.New(accessToken)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	client := oauth.NewClient(cfg)
+	authorizationCode := "{{AUTHORIZATION_CODE}}"
+	redirectURI := "{{REDIRECT_URI}}"
+
+	cred, err := client.Create(context.Background(), authorizationCode, redirectURI)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	refreshToken := cred.RefreshToken
+	cred, err = client.Refresh(context.Background(), refreshToken)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(cred)
+}

pkg/oauth/client.go

@@ -0,0 +1,98 @@
+package oauth
+
+import (
+	"context"
+	"net/url"
+
+	"github.com/mercadopago/sdk-go/pkg/config"
+	"github.com/mercadopago/sdk-go/pkg/internal/baseclient"
+)
+
+const (
+	urlBase = "https://api.mercadopago.com/oauth/token"
+	urlAuth = "https://auth.mercadopago.com/authorization"
+)
+
+// Client contains the method to interact with the Oauth API.
+type Client interface {
+
+	// Create oauth credentials to operate on behalf of a seller
+	// It is a post request to the endpoint: "https://api.mercadopago.com/oauth/token"
+	// Reference: https://www.mercadopago.com/developers/en/reference/oauth/_oauth_token/post
+	Create(ctx context.Context, authorizationCode, redirectURI string) (*Response, error)
+
+	// Get url for oauth authorization.
+	GetAuthorizationURL(clientID, redirectURI, state string) string
+
+	// Refresh token received when you create credentials.
+	// It is a post request to the endpoint: "https://api.mercadopago.com/oauth/token"
+	// Reference: https://www.mercadopago.com/developers/en/reference/oauth/_oauth_token/post
+	Refresh(ctx context.Context, refreshToken string) (*Response, error)
+}
+
+// client is the implementation of Client.
+type client struct {
+	cfg *config.Config
+}
+
+// NewClient returns a new Oauth API Client.
+func NewClient(c *config.Config) Client {
+	return &client{
+		cfg: c,
+	}
+}
+
+func (c *client) Create(ctx context.Context, authorizationCode, redirectURI string) (*Response, error) {
+	request := &Request{
+		ClientSecret: c.cfg.AccessToken,
+		Code:         authorizationCode,
+		RedirectURI:  redirectURI,
+		GrantType:    "authorization_code",
+	}
+
+	res, err := baseclient.Post[*Response](ctx, c.cfg, urlBase, request)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+func (c *client) GetAuthorizationURL(clientID, redirectURI, state string) string {
+	params := map[string]string{
+		"client_id":     clientID,
+		"response_type": "code",
+		"platform_id":   "mp",
+		"redirect_uri":  redirectURI,
+	}
+
+	parsedURL, err := url.Parse(urlAuth)
+	if err != nil {
+		return ""
+	}
+
+	queryParams := url.Values{}
+
+	for k, v := range params {
+		queryParams.Add(k, v)
+	}
+
+	parsedURL.RawQuery = queryParams.Encode()
+
+	return parsedURL.String()
+}
+
+func (c *client) Refresh(ctx context.Context, refreshToken string) (*Response, error) {
+	request := &RefreshTokenRequest{
+		ClientSecret: c.cfg.AccessToken,
+		RefreshToken: refreshToken,
+		GrantType:    "refresh_token",
+	}
+
+	res, err := baseclient.Post[*Response](ctx, c.cfg, urlBase, request)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}