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login.go
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login.go
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package github
import (
"errors"
"fmt"
"net/http"
"net/url"
"github.com/dghubble/gologin"
oauth2Login "github.com/dghubble/gologin/oauth2"
"github.com/google/go-github/github"
"golang.org/x/oauth2"
)
// Github login errors
var (
ErrUnableToGetGithubUser = errors.New("github: unable to get Github User")
)
// StateHandler checks for a state cookie. If found, the state value is read
// and added to the ctx. Otherwise, a non-guessable value is added to the ctx
// and to a (short-lived) state cookie issued to the requester.
//
// Implements OAuth 2 RFC 6749 10.12 CSRF Protection. If you wish to issue
// state params differently, write a http.Handler which sets the ctx state,
// using oauth2 WithState(ctx, state) since it is required by LoginHandler
// and CallbackHandler.
func StateHandler(config gologin.CookieConfig, success http.Handler) http.Handler {
return oauth2Login.StateHandler(config, success)
}
// LoginHandler handles Github login requests by reading the state value from
// the ctx and redirecting requests to the AuthURL with that state value.
func LoginHandler(config *oauth2.Config, failure http.Handler) http.Handler {
return oauth2Login.LoginHandler(config, failure)
}
// CallbackHandler handles Github redirection URI requests and adds the Github
// access token and User to the ctx. If authentication succeeds, handling
// delegates to the success handler, otherwise to the failure handler.
func CallbackHandler(config *oauth2.Config, success, failure http.Handler) http.Handler {
success = githubHandler(config, false, success, failure)
return oauth2Login.CallbackHandler(config, success, failure)
}
// EnterpriseCallbackHandler handles Github Enterprise redirection URI requests
// and adds the Github access token and User to the ctx. If authentication
// succeeds,handling delegates to the success handler, otherwise to the failure
// handler. The Github Enterprise API URL is inferred from the OAuth2 config's
// AuthURL endpoint.
func EnterpriseCallbackHandler(config *oauth2.Config, success, failure http.Handler) http.Handler {
success = githubHandler(config, true, success, failure)
return oauth2Login.CallbackHandler(config, success, failure)
}
// githubHandler is a http.Handler that gets the OAuth2 Token from the ctx to
// get the corresponding Github User. If successful, the User is added to the
// ctx and the success handler is called. Otherwise, the failure handler is
// called.
func githubHandler(config *oauth2.Config, isEnterprise bool, success, failure http.Handler) http.Handler {
if failure == nil {
failure = gologin.DefaultFailureHandler
}
fn := func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
token, err := oauth2Login.TokenFromContext(ctx)
if err != nil {
ctx = gologin.WithError(ctx, err)
failure.ServeHTTP(w, req.WithContext(ctx))
return
}
httpClient := config.Client(ctx, token)
var githubClient *github.Client
if isEnterprise {
githubClient, err = enterpriseGithubClientFromAuthURL(config.Endpoint.AuthURL, httpClient)
if err != nil {
ctx = gologin.WithError(ctx, fmt.Errorf("github: error creating Client: %v", err))
failure.ServeHTTP(w, req.WithContext(ctx))
return
}
} else {
githubClient = github.NewClient(httpClient)
}
user, resp, err := githubClient.Users.Get(ctx, "")
err = validateResponse(user, resp, err)
if err != nil {
ctx = gologin.WithError(ctx, err)
failure.ServeHTTP(w, req.WithContext(ctx))
return
}
ctx = WithUser(ctx, user)
success.ServeHTTP(w, req.WithContext(ctx))
}
return http.HandlerFunc(fn)
}
// validateResponse returns an error if the given Github user, raw
// http.Response, or error are unexpected. Returns nil if they are valid.
func validateResponse(user *github.User, resp *github.Response, err error) error {
if err != nil || resp.StatusCode != http.StatusOK {
return ErrUnableToGetGithubUser
}
if user == nil || user.ID == nil {
return ErrUnableToGetGithubUser
}
return nil
}
// enterpriseGithubClientFromAuthURL returns a Github client that targets a GHE instance.
func enterpriseGithubClientFromAuthURL(authURL string, httpClient *http.Client) (*github.Client, error) {
client := github.NewClient(httpClient)
// convert authURL to GHE baseURL https://<mygithub>.com/api/v3/
baseURL, err := url.Parse(authURL)
if err != nil {
return nil, fmt.Errorf("github: error parsing Endoint.AuthURL: %s", authURL)
}
baseURL.Path = "/api/v3/"
client.BaseURL = baseURL
client.UploadURL = baseURL
return client, nil
}