forgejo-federation/vendor/github.com/markbates/goth/providers/nextcloud/nextcloud.go
2020-03-02 22:11:45 -05:00

208 lines
5.8 KiB
Go

// Package nextcloud implements the OAuth2 protocol for authenticating users through nextcloud.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package nextcloud
import (
"bytes"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"fmt"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
// These vars define the Authentication, Token, and Profile URLS for Nextcloud.
// You have to set these values to something useful, because nextcloud is always
// hosted somewhere.
//
var (
AuthURL = "https://<own-server>/apps/oauth2/authorize"
TokenURL = "https://<own-server>/apps/oauth2/api/v1/token"
ProfileURL = "https://<own-server>/ocs/v2.php/cloud/user?format=json"
)
// Provider is the implementation of `goth.Provider` for accessing Nextcloud.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
authURL string
tokenURL string
profileURL string
}
// New is only here to fulfill the interface requirements and does not work properly without
// setting your own Nextcloud connect parameters, more precisely AuthURL, TokenURL and ProfileURL.
// Please use NewCustomisedDNS with the beginning of your URL or NewCustomiseURL.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
return NewCustomisedURL(clientKey, secret, callbackURL, AuthURL, TokenURL, ProfileURL, scopes...)
}
// NewCustomisedURL create a working connection to your Nextcloud server given by the values
// authURL, tokenURL and profileURL.
// If you want to use a simpler method, please have a look at NewCustomisedDNS, which gets only
// on parameter instead of three.
func NewCustomisedURL(clientKey, secret, callbackURL, authURL, tokenURL, profileURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "nextcloud",
profileURL: profileURL,
}
p.config = newConfig(p, authURL, tokenURL, scopes)
return p
}
// NewCustomisedDNS is the simplest method to create a provider based only on your key/secret
// and the beginning of the URL to your server, e.g. https://my.server.name/
func NewCustomisedDNS(clientKey, secret, callbackURL, nextcloudURL string, scopes ...string) *Provider {
return NewCustomisedURL(
clientKey,
secret,
callbackURL,
nextcloudURL+"/apps/oauth2/authorize",
nextcloudURL+"/apps/oauth2/api/v1/token",
nextcloudURL+"/ocs/v2.php/cloud/user?format=json",
scopes...,
)
}
// 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 nextcloud package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Nextcloud 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 Nextcloud and access basic information about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
sess := session.(*Session)
user := goth.User{
AccessToken: sess.AccessToken,
Provider: p.Name(),
RefreshToken: sess.RefreshToken,
ExpiresAt: sess.ExpiresAt,
}
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", p.profileURL, nil)
if err != nil {
return user, err
}
req.Header.Set("Authorization", "Bearer "+sess.AccessToken)
response, err := p.Client().Do(req)
if err != nil {
if response != nil {
response.Body.Close()
}
return user, err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
}
bits, err := ioutil.ReadAll(response.Body)
if err != nil {
return user, err
}
err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
if err != nil {
return user, err
}
err = userFromReader(bytes.NewReader(bits), &user)
return user, err
}
func newConfig(provider *Provider, authURL, tokenURL string, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: provider.ClientKey,
ClientSecret: provider.Secret,
RedirectURL: provider.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: authURL,
TokenURL: tokenURL,
},
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Ocs struct {
Data struct {
EMail string `json:"email"`
DisplayName string `json:"display-name"`
ID string `json:"id"`
Address string `json:"address"`
}
} `json:"ocs"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Email = u.Ocs.Data.EMail
user.Name = u.Ocs.Data.DisplayName
user.UserID = u.Ocs.Data.ID
user.Location = u.Ocs.Data.Address
return nil
}
//RefreshTokenAvailable refresh token is provided by auth provider or not
func (p *Provider) RefreshTokenAvailable() bool {
return true
}
//RefreshToken get new access token based on the refresh token
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
token := &oauth2.Token{RefreshToken: refreshToken}
ts := p.config.TokenSource(goth.ContextForClient(p.Client()), token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}