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dex/connector/github/github.go

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// Package github provides authentication strategies using GitHub.
package github
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"strconv"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/github"
"github.com/coreos/poke/connector"
)
const baseURL = "https://api.github.com"
// Config holds configuration options for github logins.
type Config struct {
ClientID string `yaml:"clientID"`
ClientSecret string `yaml:"clientSecret"`
RedirectURI string `yaml:"redirectURI"`
Org string `yaml:"org"`
}
// Open returns a strategy for logging in through GitHub.
func (c *Config) Open() (connector.Connector, error) {
return &githubConnector{
redirectURI: c.RedirectURI,
org: c.Org,
oauth2Config: &oauth2.Config{
ClientID: os.ExpandEnv(c.ClientID),
ClientSecret: os.ExpandEnv(c.ClientSecret),
Endpoint: github.Endpoint,
Scopes: []string{
"user:email", // View user's email
"read:org", // View user's org teams.
},
},
}, nil
}
type connectorData struct {
// GitHub's OAuth2 tokens never expire. We don't need a refresh token.
AccessToken string `json:"accessToken"`
}
var (
_ connector.CallbackConnector = (*githubConnector)(nil)
_ connector.GroupsConnector = (*githubConnector)(nil)
)
type githubConnector struct {
redirectURI string
org string
oauth2Config *oauth2.Config
ctx context.Context
cancel context.CancelFunc
}
func (c *githubConnector) Close() error {
return nil
}
func (c *githubConnector) LoginURL(callbackURL, state string) (string, error) {
if c.redirectURI != callbackURL {
return "", fmt.Errorf("expected callback URL did not match the URL in the config")
}
return c.oauth2Config.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 *githubConnector) HandleCallback(r *http.Request) (identity connector.Identity, state string, err error) {
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q := r.URL.Query()
if errType := q.Get("error"); errType != "" {
return identity, "", &oauth2Error{errType, q.Get("error_description")}
}
token, err := c.oauth2Config.Exchange(c.ctx, q.Get("code"))
if err != nil {
return identity, "", fmt.Errorf("github: failed to get token: %v", err)
}
resp, err := c.oauth2Config.Client(c.ctx, token).Get(baseURL + "/user")
if err != nil {
return identity, "", fmt.Errorf("github: get URL %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return identity, "", fmt.Errorf("github: read body: %v", err)
}
return identity, "", fmt.Errorf("%s: %s", resp.Status, body)
}
var user struct {
Name string `json:"name"`
Login string `json:"login"`
ID int `json:"id"`
Email string `json:"email"`
}
if err := json.NewDecoder(resp.Body).Decode(&user); err != nil {
return identity, "", fmt.Errorf("failed to decode response: %v", err)
}
data := connectorData{AccessToken: token.AccessToken}
connData, err := json.Marshal(data)
if err != nil {
return identity, "", fmt.Errorf("marshal connector data: %v", err)
}
username := user.Name
if username == "" {
username = user.Login
}
identity = connector.Identity{
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UserID: strconv.Itoa(user.ID),
Username: username,
Email: user.Email,
EmailVerified: true,
ConnectorData: connData,
}
return identity, q.Get("state"), nil
}
func (c *githubConnector) Groups(identity connector.Identity) ([]string, error) {
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var data connectorData
if err := json.Unmarshal(identity.ConnectorData, &data); err != nil {
return nil, fmt.Errorf("decode connector data: %v", err)
}
token := &oauth2.Token{AccessToken: data.AccessToken}
resp, err := c.oauth2Config.Client(c.ctx, token).Get(baseURL + "/user/teams")
if err != nil {
return nil, fmt.Errorf("github: get teams: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("github: read body: %v", err)
}
return nil, fmt.Errorf("%s: %s", resp.Status, body)
}
// https://developer.github.com/v3/orgs/teams/#response-12
var teams []struct {
Name string `json:"name"`
Org struct {
Login string `json:"login"`
} `json:"organization"`
}
if err := json.NewDecoder(resp.Body).Decode(&teams); err != nil {
return nil, fmt.Errorf("github: unmarshal groups: %v", err)
}
groups := []string{}
for _, team := range teams {
if team.Org.Login == c.org {
groups = append(groups, team.Name)
}
}
return groups, nil
}