118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
package identification
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import (
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"context"
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"io"
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"net/http"
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"git.coopgo.io/coopgo-apps/parcoursmob/services"
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"github.com/coreos/go-oidc"
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"github.com/gorilla/sessions"
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"github.com/spf13/viper"
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"golang.org/x/oauth2"
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)
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type ContextKey string
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const IdtokenKey ContextKey = "idtoken"
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const ClaimsKey ContextKey = "claims"
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type IdentificationProvider struct {
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SessionsStore sessions.Store
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Provider *oidc.Provider
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OAuth2Config oauth2.Config
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TokenVerifier *oidc.IDTokenVerifier
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Services *services.ServicesHandler
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}
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func NewIdentificationProvider(cfg *viper.Viper, services *services.ServicesHandler) (*IdentificationProvider, error) {
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var (
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providerURL = cfg.GetString("identification.oidc.provider")
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clientID = cfg.GetString("identification.oidc.client_id")
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clientSecret = cfg.GetString("identification.oidc.client_secret")
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redirectURL = cfg.GetString("identification.oidc.redirect_url")
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sessionsSecret = cfg.GetString("identification.sessions.secret")
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)
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provider, err := oidc.NewProvider(context.Background(), providerURL)
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if err != nil {
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return nil, err
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}
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oauth2Config := oauth2.Config{
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ClientID: clientID,
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ClientSecret: clientSecret,
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RedirectURL: redirectURL,
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// Discovery returns the OAuth2 endpoints.
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Endpoint: provider.Endpoint(),
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// "openid" is a required scope for OpenID Connect flows.
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Scopes: []string{oidc.ScopeOpenID, "groups", "first_name", "last_name", "display_name", "email"},
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}
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var store = sessions.NewCookieStore([]byte(sessionsSecret))
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verifier := provider.Verifier(&oidc.Config{ClientID: oauth2Config.ClientID})
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return &IdentificationProvider{
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SessionsStore: store,
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Provider: provider,
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OAuth2Config: oauth2Config,
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TokenVerifier: verifier,
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Services: services,
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}, nil
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}
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func (p *IdentificationProvider) Middleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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session, _ := p.SessionsStore.Get(r, "parcoursmob_session")
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if session.Values["idtoken"] == nil || session.Values["idtoken"] == "" {
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state, err := newState()
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if err != nil {
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panic(err)
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}
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session.Values["state"] = state
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session.Save(r, w)
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http.Redirect(w, r, p.OAuth2Config.AuthCodeURL(state), http.StatusFound)
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return
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}
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idtoken, err := p.TokenVerifier.Verify(context.Background(), session.Values["idtoken"].(string))
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if err != nil {
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state, err := newState()
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if err != nil {
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panic(err)
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}
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session.Values["state"] = state
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delete(session.Values, "idtoken")
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http.Redirect(w, r, p.OAuth2Config.AuthCodeURL(state), http.StatusFound)
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return
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}
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var claims map[string]any
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err = idtoken.Claims(&claims)
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if err != nil {
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fmt.Println(err)
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}
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ctx := context.WithValue(r.Context(), IdtokenKey, idtoken)
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ctx = context.WithValue(ctx, ClaimsKey, claims)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func newState() (string, error) {
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b := make([]byte, 16)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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