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208 lines
5.8 KiB
Go
Vendored
208 lines
5.8 KiB
Go
Vendored
// Package nextcloud implements the OAuth2 protocol for authenticating users through nextcloud.
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// This package can be used as a reference implementation of an OAuth2 provider for Goth.
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package nextcloud
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import (
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"bytes"
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"encoding/json"
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"io"
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"io/ioutil"
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"net/http"
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"fmt"
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"github.com/markbates/goth"
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"golang.org/x/oauth2"
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)
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// These vars define the Authentication, Token, and Profile URLS for Nextcloud.
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// You have to set these values to something useful, because nextcloud is always
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// hosted somewhere.
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//
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var (
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AuthURL = "https://<own-server>/apps/oauth2/authorize"
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TokenURL = "https://<own-server>/apps/oauth2/api/v1/token"
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ProfileURL = "https://<own-server>/ocs/v2.php/cloud/user?format=json"
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)
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// Provider is the implementation of `goth.Provider` for accessing Nextcloud.
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type Provider struct {
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ClientKey string
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Secret string
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CallbackURL string
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HTTPClient *http.Client
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config *oauth2.Config
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providerName string
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authURL string
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tokenURL string
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profileURL string
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}
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// New is only here to fulfill the interface requirements and does not work properly without
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// setting your own Nextcloud connect parameters, more precisely AuthURL, TokenURL and ProfileURL.
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// Please use NewCustomisedDNS with the beginning of your URL or NewCustomiseURL.
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func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
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return NewCustomisedURL(clientKey, secret, callbackURL, AuthURL, TokenURL, ProfileURL, scopes...)
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}
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// NewCustomisedURL create a working connection to your Nextcloud server given by the values
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// authURL, tokenURL and profileURL.
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// If you want to use a simpler method, please have a look at NewCustomisedDNS, which gets only
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// on parameter instead of three.
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func NewCustomisedURL(clientKey, secret, callbackURL, authURL, tokenURL, profileURL string, scopes ...string) *Provider {
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p := &Provider{
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ClientKey: clientKey,
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Secret: secret,
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CallbackURL: callbackURL,
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providerName: "nextcloud",
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profileURL: profileURL,
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}
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p.config = newConfig(p, authURL, tokenURL, scopes)
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return p
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}
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// NewCustomisedDNS is the simplest method to create a provider based only on your key/secret
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// and the beginning of the URL to your server, e.g. https://my.server.name/
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func NewCustomisedDNS(clientKey, secret, callbackURL, nextcloudURL string, scopes ...string) *Provider {
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return NewCustomisedURL(
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clientKey,
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secret,
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callbackURL,
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nextcloudURL+"/apps/oauth2/authorize",
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nextcloudURL+"/apps/oauth2/api/v1/token",
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nextcloudURL+"/ocs/v2.php/cloud/user?format=json",
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scopes...,
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)
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}
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// Name is the name used to retrieve this provider later.
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func (p *Provider) Name() string {
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return p.providerName
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}
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// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
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func (p *Provider) SetName(name string) {
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p.providerName = name
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}
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func (p *Provider) Client() *http.Client {
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return goth.HTTPClientWithFallBack(p.HTTPClient)
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}
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// Debug is a no-op for the nextcloud package.
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func (p *Provider) Debug(debug bool) {}
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// BeginAuth asks Nextcloud for an authentication end-point.
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func (p *Provider) BeginAuth(state string) (goth.Session, error) {
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return &Session{
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AuthURL: p.config.AuthCodeURL(state),
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}, nil
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}
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// FetchUser will go to Nextcloud and access basic information about the user.
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func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
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sess := session.(*Session)
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user := goth.User{
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AccessToken: sess.AccessToken,
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Provider: p.Name(),
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RefreshToken: sess.RefreshToken,
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ExpiresAt: sess.ExpiresAt,
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}
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if user.AccessToken == "" {
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// data is not yet retrieved since accessToken is still empty
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return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
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}
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req, err := http.NewRequest("GET", p.profileURL, nil)
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if err != nil {
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return user, err
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}
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req.Header.Set("Authorization", "Bearer "+sess.AccessToken)
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response, err := p.Client().Do(req)
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if err != nil {
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if response != nil {
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response.Body.Close()
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}
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return user, err
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}
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defer response.Body.Close()
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if response.StatusCode != http.StatusOK {
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return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
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}
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bits, err := ioutil.ReadAll(response.Body)
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if err != nil {
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return user, err
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}
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err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
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if err != nil {
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return user, err
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}
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err = userFromReader(bytes.NewReader(bits), &user)
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return user, err
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}
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func newConfig(provider *Provider, authURL, tokenURL string, scopes []string) *oauth2.Config {
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c := &oauth2.Config{
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ClientID: provider.ClientKey,
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ClientSecret: provider.Secret,
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RedirectURL: provider.CallbackURL,
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Endpoint: oauth2.Endpoint{
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AuthURL: authURL,
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TokenURL: tokenURL,
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},
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Scopes: []string{},
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}
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if len(scopes) > 0 {
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for _, scope := range scopes {
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c.Scopes = append(c.Scopes, scope)
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}
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}
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return c
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}
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func userFromReader(r io.Reader, user *goth.User) error {
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u := struct {
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Ocs struct {
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Data struct {
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EMail string `json:"email"`
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DisplayName string `json:"display-name"`
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ID string `json:"id"`
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Address string `json:"address"`
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}
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} `json:"ocs"`
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}{}
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err := json.NewDecoder(r).Decode(&u)
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if err != nil {
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return err
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}
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user.Email = u.Ocs.Data.EMail
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user.Name = u.Ocs.Data.DisplayName
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user.UserID = u.Ocs.Data.ID
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user.Location = u.Ocs.Data.Address
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return nil
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}
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//RefreshTokenAvailable refresh token is provided by auth provider or not
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func (p *Provider) RefreshTokenAvailable() bool {
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return true
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}
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//RefreshToken get new access token based on the refresh token
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func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
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token := &oauth2.Token{RefreshToken: refreshToken}
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ts := p.config.TokenSource(goth.ContextForClient(p.Client()), token)
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newToken, err := ts.Token()
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if err != nil {
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return nil, err
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}
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return newToken, err
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}
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