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github.go
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github.go
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package github
import (
"context"
"fmt"
"io"
"net/http"
"golang.org/x/oauth2"
"github.com/ovh/cds/engine/api/authentication"
"github.com/ovh/cds/sdk"
)
var _ sdk.DriverWithRedirect = new(githubDriver)
var _ sdk.DriverWithSigninStateToken = new(githubDriver)
// NewGithubDriver returns a new Github driver for given config.
func NewGithubDriver(cdsURL, url, urlAPI, clientID, clientSecret string) sdk.Driver {
return &githubDriver{
cdsURL: cdsURL,
url: url,
urlAPI: urlAPI,
clientID: clientID,
clientSecret: clientSecret,
}
}
type githubDriver struct {
cdsURL string
url string
urlAPI string
clientID string
clientSecret string
}
func (gd githubDriver) GetSigninURI(signinState sdk.AuthSigninConsumerToken) (sdk.AuthDriverSigningRedirect, error) {
// Generate a new state value for the auth signin request
jws, err := authentication.NewDefaultSigninStateToken(signinState)
if err != nil {
return sdk.AuthDriverSigningRedirect{}, err
}
var result = sdk.AuthDriverSigningRedirect{
Method: http.MethodGet,
URL: fmt.Sprintf("%s/login/oauth/authorize?client_id=%s&scope=user&state=%s&redirect_uri=%s", gd.url, gd.clientID, jws, gd.cdsURL+"/auth/callback/github"),
}
return result, nil
}
func (gd githubDriver) CheckSigninRequest(req sdk.AuthConsumerSigninRequest) error {
code, err := req.StringE("code")
if err != nil || code == "" {
return sdk.NewErrorFrom(sdk.ErrWrongRequest, "missing or invalid gitlab code")
}
return nil
}
func (d githubDriver) CheckSigninStateToken(req sdk.AuthConsumerSigninRequest) error {
// Check if state is given and if its valid
state, err := req.StringE("state")
if err != nil {
return sdk.NewErrorFrom(sdk.ErrWrongRequest, "missing or invalid state value")
}
return authentication.CheckDefaultSigninStateToken(state)
}
func (gd githubDriver) GetUserInfoFromDriver(ctx context.Context, req sdk.AuthConsumerSigninRequest) (sdk.AuthDriverUserInfo, error) {
var info sdk.AuthDriverUserInfo
config := &oauth2.Config{
Endpoint: oauth2.Endpoint{
TokenURL: fmt.Sprintf("%s/login/oauth/access_token", gd.url),
},
}
ctx2 := context.WithValue(context.Background(), oauth2.HTTPClient, http.DefaultClient)
t, err := config.Exchange(ctx2, req.String("code"),
oauth2.SetAuthURLParam("client_id", gd.clientID),
oauth2.SetAuthURLParam("client_secret", gd.clientSecret),
oauth2.SetAuthURLParam("state", req.String("state")),
oauth2.SetAuthURLParam("redirect_uri", gd.cdsURL+"/auth/callback/github"),
)
if err != nil {
return info, sdk.WrapError(err, "cannot get github token with given code")
}
request, err := http.NewRequest(http.MethodGet, gd.urlAPI+"/user", nil)
if err != nil {
return info, sdk.WithStack(err)
}
request.Header.Set("Authorization", "token "+t.AccessToken)
res, err := http.DefaultClient.Do(request)
if err != nil {
return info, sdk.WithStack(err)
}
if res.StatusCode != 200 {
return info, sdk.NewErrorFrom(sdk.ErrUnknownError, "cannot get current user from github")
}
defer res.Body.Close()
resBody, err := io.ReadAll(res.Body)
if err != nil {
return info, sdk.WithStack(err)
}
var githubUser struct {
ID int `json:"id"`
Login string `json:"login"`
Email string `json:"email"`
Name string `json:"name"`
}
if err := sdk.JSONUnmarshal(resBody, &githubUser); err != nil {
return info, sdk.WithStack(err)
}
info.ExternalID = fmt.Sprintf("%d", githubUser.ID)
info.Username = githubUser.Login
info.Fullname = githubUser.Name
info.Email = githubUser.Email
return info, nil
}