Cleanup internalSession params & handle profileURL Bearer case better

`findClaimsFromIDToken` would always have a `nil` access token and not be
able to hit the userinfo endpoint in Bearer case. If access token is nil,
default to legacy `session.Email = claim.Subject` that all JWT bearers used
to have, even if a valid profileURL is present.

providers/oidc.go

@@ -157,7 +157,7 @@ func (p *OIDCProvider) createSessionState(ctx context.Context, token *oauth2.Tok
 		newSession = &sessions.SessionState{}
 	} else {
 		var err error
-		newSession, err = p.createSessionStateInternal(ctx, token.Extra("id_token").(string), idToken, token, false)
+		newSession, err = p.createSessionStateInternal(ctx, idToken, token)
 		if err != nil {
 			return nil, err
 		}
@@ -172,7 +172,7 @@ func (p *OIDCProvider) createSessionState(ctx context.Context, token *oauth2.Tok
 }
 
 func (p *OIDCProvider) CreateSessionStateFromBearerToken(ctx context.Context, rawIDToken string, idToken *oidc.IDToken) (*sessions.SessionState, error) {
-	newSession, err := p.createSessionStateInternal(ctx, rawIDToken, idToken, nil, true)
+	newSession, err := p.createSessionStateInternal(ctx, idToken, nil)
 	if err != nil {
 		return nil, err
 	}
@@ -185,24 +185,22 @@ func (p *OIDCProvider) CreateSessionStateFromBearerToken(ctx context.Context, ra
 	return newSession, nil
 }
 
-func (p *OIDCProvider) createSessionStateInternal(ctx context.Context, rawIDToken string, idToken *oidc.IDToken, token *oauth2.Token, bearer bool) (*sessions.SessionState, error) {
+func (p *OIDCProvider) createSessionStateInternal(ctx context.Context, idToken *oidc.IDToken, token *oauth2.Token) (*sessions.SessionState, error) {
 
 	newSession := &sessions.SessionState{}
 
 	if idToken == nil {
 		return newSession, nil
 	}
-	accessToken := ""
-	if token != nil {
-		accessToken = token.AccessToken
-	}
 
-	claims, err := p.findClaimsFromIDToken(ctx, idToken, accessToken, p.ProfileURL.String(), bearer)
+	claims, err := p.findClaimsFromIDToken(ctx, idToken, token)
 	if err != nil {
 		return nil, fmt.Errorf("couldn't extract claims from id_token (%v)", err)
 	}
 
-	newSession.IDToken = rawIDToken
+	if token != nil {
+		newSession.IDToken = token.Extra("id_token").(string)
+	}
 
 	newSession.Email = claims.UserID // TODO Rename SessionState.Email to .UserID in the near future
 
@@ -230,7 +228,7 @@ func getOIDCHeader(accessToken string) http.Header {
 	return header
 }
 
-func (p *OIDCProvider) findClaimsFromIDToken(ctx context.Context, idToken *oidc.IDToken, accessToken string, profileURL string, bearer bool) (*OIDCClaims, error) {
+func (p *OIDCProvider) findClaimsFromIDToken(ctx context.Context, idToken *oidc.IDToken, token *oauth2.Token) (*OIDCClaims, error) {
 	claims := &OIDCClaims{}
 	// Extract default claims.
 	if err := idToken.Claims(&claims); err != nil {
@@ -248,11 +246,15 @@ func (p *OIDCProvider) findClaimsFromIDToken(ctx context.Context, idToken *oidc.
 
 	// userID claim was not present or was empty in the ID Token
 	if claims.UserID == "" {
-		if profileURL == "" {
+		// BearerToken case, allow empty UserID
-			if bearer {
+		// ProfileURL checks below won't work since we don't have an access token
+		if token == nil {
 			claims.UserID = claims.Subject
 			return claims, nil
 		}
+
+		profileURL := p.ProfileURL.String()
+		if profileURL == "" || token.AccessToken == "" {
 			return nil, fmt.Errorf("id_token did not contain user ID claim (%q)", p.UserIDClaim)
 		}
 
@@ -261,7 +263,7 @@ func (p *OIDCProvider) findClaimsFromIDToken(ctx context.Context, idToken *oidc.
 		// Make a query to the userinfo endpoint, and attempt to locate the email from there.
 		respJSON, err := requests.New(profileURL).
 			WithContext(ctx).
-			WithHeaders(getOIDCHeader(accessToken)).
+			WithHeaders(getOIDCHeader(token.AccessToken)).
 			Do().
 			UnmarshalJSON()
 		if err != nil {

providers/oidc_test.go

@@ -274,23 +274,18 @@ func TestCreateSessionStateFromBearerToken(t *testing.T) {
 
 	testCases := map[string]struct {
 		IDToken       idTokenClaims
-		ProfileURL    bool
+		ExpectedUser  string
 		ExpectedEmail string
 	}{
 		"Default IDToken": {
 			IDToken:       defaultIDToken,
-			ProfileURL:    true,
+			ExpectedUser:  defaultIDToken.Subject,
-			ExpectedEmail: profileURLEmail,
+			ExpectedEmail: defaultIDToken.Email,
 		},
-		"Minimal IDToken with no OIDC Profile URL": {
+		"Minimal IDToken with no email claim": {
 			IDToken:       minimalIDToken,
-			ProfileURL:    false,
+			ExpectedUser:  minimalIDToken.Subject,
-			ExpectedEmail: "",
+			ExpectedEmail: minimalIDToken.Subject,
-		},
-		"Minimal IDToken with OIDC Profile URL": {
-			IDToken:       minimalIDToken,
-			ProfileURL:    true,
-			ExpectedEmail: profileURLEmail,
 		},
 	}
 	for testName, tc := range testCases {
@@ -298,9 +293,6 @@ func TestCreateSessionStateFromBearerToken(t *testing.T) {
 			jsonResp := []byte(fmt.Sprintf(`{"email":"%s"}`, profileURLEmail))
 			server, provider := newTestSetup(jsonResp)
 			defer server.Close()
-			if !tc.ProfileURL {
-				provider.ProfileURL = &url.URL{}
-			}
 
 			rawIDToken, err := newSignedTestIDToken(tc.IDToken)
 			assert.NoError(t, err)
@@ -315,13 +307,8 @@ func TestCreateSessionStateFromBearerToken(t *testing.T) {
 			ss, err := provider.CreateSessionStateFromBearerToken(context.Background(), rawIDToken, idToken)
 			assert.NoError(t, err)
 
-			if tc.ExpectedEmail != "" {
+			assert.Equal(t, tc.ExpectedUser, ss.User)
 			assert.Equal(t, tc.ExpectedEmail, ss.Email)
-				assert.NotEqual(t, ss.Email, ss.User)
-			} else {
-				assert.Equal(t, tc.IDToken.Subject, ss.Email)
-				assert.Equal(t, ss.Email, ss.User)
-			}
 			assert.Equal(t, rawIDToken, ss.IDToken)
 			assert.Equal(t, rawIDToken, ss.AccessToken)
 			assert.Equal(t, "", ss.RefreshToken)