Select oauth provider

This commit is contained in:
Meutel 2017-09-08 20:29:01 +02:00
parent 893daeab71
commit 93a1de6452
4 changed files with 104 additions and 45 deletions

View File

@ -12,12 +12,68 @@ import (
)
const (
alphanums = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
sessionName = "bouquins"
sessionOAuthState = "oauthState"
sessionUser = "username"
alphanums = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
sessionName = "bouquins"
sessionOAuthState = "oauthState"
sessionOAuthProvider = "provider"
sessionUser = "username"
pProvider = "provider"
)
var (
Providers = [1]OAuth2Provider{GithubProvider("github")}
)
type OAuth2Provider interface {
GetUser(token *oauth2.Token) (string, error)
Name() string
}
type GithubProvider string
func (p GithubProvider) Name() string {
return string(p)
}
func (p GithubProvider) GetUser(token *oauth2.Token) (string, error) {
apiReq, err := http.NewRequest("GET", "https://api.github.com/user/emails", nil)
apiReq.Header.Add("Accept", "application/vnd.github.v3+json")
apiReq.Header.Add("Authorization", "token "+token.AccessToken)
client := &http.Client{}
response, err := client.Do(apiReq)
defer response.Body.Close()
if err != nil {
log.Println("Auth error", err)
return "", fmt.Errorf("Authentification error")
}
dec := json.NewDecoder(response.Body)
var emails []GitHubEmail
err = dec.Decode(&emails)
if err != nil {
log.Println("Error reading github API response", err)
return "", fmt.Errorf("Error reading github API response")
}
fmt.Printf("Content: %s\n", emails)
var userEmail string
for _, email := range emails {
if email.Primary && email.Verified {
userEmail = email.Email
}
}
log.Println("User email:", userEmail)
return userEmail, nil
}
func findProvider(name string) OAuth2Provider {
for _, p := range Providers {
if p.Name() == name {
return p
}
}
return nil
}
// generates a 16 characters long random string
func securedRandString() string {
b := make([]byte, 16)
@ -51,12 +107,18 @@ func (app *Bouquins) SessionSet(name string, value string, res http.ResponseWrit
// LoginPage redirects to OAuth login page (github)
func (app *Bouquins) LoginPage(res http.ResponseWriter, req *http.Request) error {
// TODO choose provider
state := securedRandString()
app.SessionSet(sessionOAuthState, state, res, req)
url := app.OAuthConf.AuthCodeURL(state)
http.Redirect(res, req, url, http.StatusTemporaryRedirect)
return nil
provider := req.URL.Query().Get(pProvider)
oauth := app.OAuthConf[provider]
if oauth != nil {
app.SessionSet(sessionOAuthProvider, provider, res, req)
state := securedRandString()
app.SessionSet(sessionOAuthState, state, res, req)
url := oauth.AuthCodeURL(state)
http.Redirect(res, req, url, http.StatusTemporaryRedirect)
return nil
}
// choose provider
return app.render(res, tplProvider, app.NewModel("Authentification", "provider", req))
}
// LogoutPage logout connected user
@ -68,45 +130,31 @@ func (app *Bouquins) LogoutPage(res http.ResponseWriter, req *http.Request) erro
// CallbackPage handle OAuth 2 callback
func (app *Bouquins) CallbackPage(res http.ResponseWriter, req *http.Request) error {
savedState := app.Session(req).Values[sessionOAuthState]
if savedState == "" {
return fmt.Errorf("missing saved oauth state")
providerParam := app.Session(req).Values[sessionOAuthProvider]
if savedState == "" || providerParam == "" {
return fmt.Errorf("missing oauth data")
}
providerName := providerParam.(string)
oauth := app.OAuthConf[providerName]
provider := findProvider(providerName)
if oauth == nil || provider == nil {
return fmt.Errorf("missing oauth configuration")
}
app.SessionSet(sessionOAuthState, "", res, req)
app.SessionSet(sessionOAuthProvider, "", res, req)
state := req.FormValue("state")
if state != savedState {
return fmt.Errorf("invalid oauth state, expected '%s', got '%s'", "state", state)
}
code := req.FormValue("code")
token, err := app.OAuthConf.Exchange(oauth2.NoContext, code)
token, err := oauth.Exchange(oauth2.NoContext, code)
if err != nil {
return fmt.Errorf("Code exchange failed with '%s'", err)
}
apiReq, err := http.NewRequest("GET", "https://api.github.com/user/emails", nil)
apiReq.Header.Add("Accept", "application/vnd.github.v3+json")
apiReq.Header.Add("Authorization", "token "+token.AccessToken)
client := &http.Client{}
response, err := client.Do(apiReq)
defer response.Body.Close()
userEmail, err := provider.GetUser(token)
if err != nil {
log.Println("Auth error", err)
return fmt.Errorf("Authentification error")
return err
}
dec := json.NewDecoder(response.Body)
var emails []GitHubEmail
err = dec.Decode(&emails)
if err != nil {
log.Println("Error reading github API response", err)
return fmt.Errorf("Error reading github API response")
}
fmt.Printf("Content: %s\n", emails)
var userEmail string
for _, email := range emails {
if email.Primary && email.Verified {
userEmail = email.Email
}
}
log.Println("User email:", userEmail)
// FIXME list allowed users
if userEmail == "meutel+github@meutel.net" {
app.SessionSet(sessionUser, "Meutel", res, req)

View File

@ -21,12 +21,13 @@ import (
const (
Version = "master"
tplBooks = "book.html"
tplAuthors = "author.html"
tplSeries = "series.html"
tplIndex = "index.html"
tplSearch = "search.html"
tplAbout = "about.html"
tplBooks = "book.html"
tplAuthors = "author.html"
tplSeries = "series.html"
tplIndex = "index.html"
tplSearch = "search.html"
tplAbout = "about.html"
tplProvider = "provider.html"
pList = "list"
pOrder = "order"
@ -74,7 +75,7 @@ type GitHubEmail struct {
type Bouquins struct {
Tpl *template.Template
DB *sql.DB
OAuthConf *oauth2.Config
OAuthConf map[string]*oauth2.Config
Cookies *sessions.CookieStore
}

View File

@ -71,7 +71,8 @@ func initApp() *BouquinsConf {
}
// TODO conf by provider, client ID and secret in conf file
oauthConf := &oauth2.Config{
oauthConf := make(map[string]*oauth2.Config)
oauthConf["github"] = &oauth2.Config{
ClientID: "8b0aedf07828f06918a0",
ClientSecret: "eb26ec9c986fc28bd169bdddf169b794861e0d65",
Scopes: []string{"user:email"},

9
templates/provider.html Normal file
View File

@ -0,0 +1,9 @@
{{ template "header.html" . }}
<div class="container" id="provider">
<p>Veuillez sélectionner un mode d'authentification:<p>
<ul>
<!-- TODO list providers, icon -->
<li><a href="/login?provider=github">Github</a></li>
</ul>
</div>
{{ template "footer.html" . }}