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// Package dropbox implements the OAuth2 protocol for authenticating users through Dropbox.
package dropbox
import (
"encoding/json"
"errors"
"io"
"net/http"
"strings"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
const (
authURL = "https://www.dropbox.com/1/oauth2/authorize"
tokenURL = "https://api.dropbox.com/1/oauth2/token"
accountURL = "https://api.dropbox.com/1/account/info"
)
// Provider is the implementation of `goth.Provider` for accessing Dropbox.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// Session stores data during the auth process with Dropbox.
type Session struct {
AuthURL string
Token string
}
// New creates a new Dropbox provider and sets up important connection details.
// You should always call `dropbox.New` to get a new provider. Never try to
// create one manually.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "dropbox",
}
p.config = newConfig(p, scopes)
return p
}
// Name is the name used to retrieve this provider later.
func (p *Provider) Name() string {
return p.providerName
}
// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
func (p *Provider) SetName(name string) {
p.providerName = name
}
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug is a no-op for the dropbox package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Dropbox for an authentication end-point.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
return &Session{
AuthURL: p.config.AuthCodeURL(state),
}, nil
}
// FetchUser will go to Dropbox and access basic information about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
s := session.(*Session)
user := goth.User{
AccessToken: s.Token,
Provider: p.Name(),
}
if user.AccessToken == "" {
// data is not yet retrieved since accessToken is still empty
return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
}
req, err := http.NewRequest("GET", accountURL, nil)
if err != nil {
return user, err
}
req.Header.Set("Authorization", "Bearer "+s.Token)
resp, err := p.Client().Do(req)
if err != nil {
return user, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, resp.StatusCode)
}
err = userFromReader(resp.Body, &user)
return user, err
}
// UnmarshalSession wil unmarshal a JSON string into a session.
func (p *Provider) UnmarshalSession(data string) (goth.Session, error) {
s := &Session{}
err := json.NewDecoder(strings.NewReader(data)).Decode(s)
return s, err
}
// GetAuthURL gets the URL set by calling the `BeginAuth` function on the Dropbox provider.
func (s *Session) GetAuthURL() (string, error) {
if s.AuthURL == "" {
return "", errors.New("dropbox: missing AuthURL")
}
return s.AuthURL, nil
}
// Authorize the session with Dropbox and return the access token to be stored for future use.
func (s *Session) Authorize(provider goth.Provider, params goth.Params) (string, error) {
p := provider.(*Provider)
token, err := p.config.Exchange(goth.ContextForClient(p.Client()), params.Get("code"))
if err != nil {
return "", err
}
if !token.Valid() {
return "", errors.New("Invalid token received from provider")
}
s.Token = token.AccessToken
return token.AccessToken, nil
}
// Marshal the session into a string
func (s *Session) Marshal() string {
b, _ := json.Marshal(s)
return string(b)
}
func (s Session) String() string {
return s.Marshal()
}
func newConfig(p *Provider, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: p.ClientKey,
ClientSecret: p.Secret,
RedirectURL: p.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: authURL,
TokenURL: tokenURL,
},
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"display_name"`
NameDetails struct {
NickName string `json:"familiar_name"`
} `json:"name_details"`
Location string `json:"country"`
Email string `json:"email"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Email = u.Email
user.Name = u.Name
user.NickName = u.NameDetails.NickName
user.UserID = u.Email // Dropbox doesn't provide a separate user ID
user.Location = u.Location
return nil
}
//RefreshToken refresh token is not provided by dropbox
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by dropbox")
}
//RefreshTokenAvailable refresh token is not provided by dropbox
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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