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dex/connector/gitea/gitea.go
techknowlogick 0a9f56527e
Add Gitea connector (#1715)
* Add Gitea connector

* Add details to readme

* resolve lint issue
2020-05-26 13:54:40 +02:00

266 lines
7 KiB
Go

// Package gitea provides authentication strategies using Gitea.
package gitea
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"sync"
"time"
"golang.org/x/oauth2"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/pkg/log"
)
// Config holds configuration options for gitea logins.
type Config struct {
BaseURL string `json:"baseURL"`
ClientID string `json:"clientID"`
ClientSecret string `json:"clientSecret"`
RedirectURI string `json:"redirectURI"`
UseLoginAsID bool `json:"useLoginAsID"`
}
type giteaUser struct {
ID int `json:"id"`
Name string `json:"full_name"`
Username string `json:"login"`
Email string `json:"email"`
IsAdmin bool `json:"is_admin"`
}
// Open returns a strategy for logging in through GitLab.
func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
if c.BaseURL == "" {
c.BaseURL = "https://gitea.com"
}
return &giteaConnector{
baseURL: c.BaseURL,
redirectURI: c.RedirectURI,
clientID: c.ClientID,
clientSecret: c.ClientSecret,
logger: logger,
useLoginAsID: c.UseLoginAsID,
}, nil
}
type connectorData struct {
AccessToken string `json:"accessToken"`
RefreshToken string `json:"refreshToken"`
Expiry time.Time `json:"expiry"`
}
var (
_ connector.CallbackConnector = (*giteaConnector)(nil)
_ connector.RefreshConnector = (*giteaConnector)(nil)
)
type giteaConnector struct {
baseURL string
redirectURI string
clientID string
clientSecret string
logger log.Logger
httpClient *http.Client
// if set to true will use the user's handle rather than their numeric id as the ID
useLoginAsID bool
}
func (c *giteaConnector) oauth2Config(scopes connector.Scopes) *oauth2.Config {
giteaEndpoint := oauth2.Endpoint{AuthURL: c.baseURL + "/login/oauth/authorize", TokenURL: c.baseURL + "/login/oauth/access_token"}
return &oauth2.Config{
ClientID: c.clientID,
ClientSecret: c.clientSecret,
Endpoint: giteaEndpoint,
RedirectURL: c.redirectURI,
}
}
func (c *giteaConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) {
if c.redirectURI != callbackURL {
return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", c.redirectURI, callbackURL)
}
return c.oauth2Config(scopes).AuthCodeURL(state), nil
}
type oauth2Error struct {
error string
errorDescription string
}
func (e *oauth2Error) Error() string {
if e.errorDescription == "" {
return e.error
}
return e.error + ": " + e.errorDescription
}
func (c *giteaConnector) HandleCallback(s connector.Scopes, r *http.Request) (identity connector.Identity, err error) {
q := r.URL.Query()
if errType := q.Get("error"); errType != "" {
return identity, &oauth2Error{errType, q.Get("error_description")}
}
oauth2Config := c.oauth2Config(s)
ctx := r.Context()
if c.httpClient != nil {
ctx = context.WithValue(r.Context(), oauth2.HTTPClient, c.httpClient)
}
token, err := oauth2Config.Exchange(ctx, q.Get("code"))
if err != nil {
return identity, fmt.Errorf("gitea: failed to get token: %v", err)
}
client := oauth2Config.Client(ctx, token)
user, err := c.user(ctx, client)
if err != nil {
return identity, fmt.Errorf("gitea: get user: %v", err)
}
username := user.Name
if username == "" {
username = user.Email
}
identity = connector.Identity{
UserID: strconv.Itoa(user.ID),
Username: username,
PreferredUsername: user.Username,
Email: user.Email,
EmailVerified: true,
}
if c.useLoginAsID {
identity.UserID = user.Username
}
if s.OfflineAccess {
data := connectorData{
AccessToken: token.AccessToken,
RefreshToken: token.RefreshToken,
Expiry: token.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return identity, fmt.Errorf("gitea: marshal connector data: %v", err)
}
identity.ConnectorData = connData
}
return identity, nil
}
// Refreshing tokens
// https://github.com/golang/oauth2/issues/84#issuecomment-332860871
type tokenNotifyFunc func(*oauth2.Token) error
// notifyRefreshTokenSource is essentially `oauth2.ReuseTokenSource` with `TokenNotifyFunc` added.
type notifyRefreshTokenSource struct {
new oauth2.TokenSource
mu sync.Mutex // guards t
t *oauth2.Token
f tokenNotifyFunc // called when token refreshed so new refresh token can be persisted
}
// Token returns the current token if it's still valid, else will
// refresh the current token (using r.Context for HTTP client
// information) and return the new one.
func (s *notifyRefreshTokenSource) Token() (*oauth2.Token, error) {
s.mu.Lock()
defer s.mu.Unlock()
if s.t.Valid() {
return s.t, nil
}
t, err := s.new.Token()
if err != nil {
return nil, err
}
s.t = t
return t, s.f(t)
}
func (c *giteaConnector) Refresh(ctx context.Context, s connector.Scopes, ident connector.Identity) (connector.Identity, error) {
if len(ident.ConnectorData) == 0 {
return ident, errors.New("gitea: no upstream access token found")
}
var data connectorData
if err := json.Unmarshal(ident.ConnectorData, &data); err != nil {
return ident, fmt.Errorf("gitea: unmarshal access token: %v", err)
}
tok := &oauth2.Token{
AccessToken: data.AccessToken,
RefreshToken: data.RefreshToken,
Expiry: data.Expiry,
}
client := oauth2.NewClient(ctx, &notifyRefreshTokenSource{
new: c.oauth2Config(s).TokenSource(ctx, tok),
t: tok,
f: func(tok *oauth2.Token) error {
data := connectorData{
AccessToken: tok.AccessToken,
RefreshToken: tok.RefreshToken,
Expiry: tok.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return fmt.Errorf("gitea: marshal connector data: %v", err)
}
ident.ConnectorData = connData
return nil
},
})
user, err := c.user(ctx, client)
if err != nil {
return ident, fmt.Errorf("gitea: get user: %v", err)
}
username := user.Name
if username == "" {
username = user.Email
}
ident.Username = username
ident.PreferredUsername = user.Username
ident.Email = user.Email
return ident, nil
}
// user queries the Gitea API for profile information using the provided client. The HTTP
// client is expected to be constructed by the golang.org/x/oauth2 package, which inserts
// a bearer token as part of the request.
func (c *giteaConnector) user(ctx context.Context, client *http.Client) (giteaUser, error) {
var u giteaUser
req, err := http.NewRequest("GET", c.baseURL+"/api/v1/user", nil)
if err != nil {
return u, fmt.Errorf("gitea: new req: %v", err)
}
req = req.WithContext(ctx)
resp, err := client.Do(req)
if err != nil {
return u, fmt.Errorf("gitea: get URL %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return u, fmt.Errorf("gitea: read body: %v", err)
}
return u, fmt.Errorf("%s: %s", resp.Status, body)
}
if err := json.NewDecoder(resp.Body).Decode(&u); err != nil {
return u, fmt.Errorf("failed to decode response: %v", err)
}
return u, nil
}