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// Copyright 2021 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package frontend
import (
"encoding/json"
"go.chromium.org/luci/auth/identity"
"go.chromium.org/luci/common/errors"
"go.chromium.org/luci/grpc/grpcutil"
"go.chromium.org/luci/server/auth"
"go.chromium.org/luci/server/router"
)
type authState struct {
// Identity string of the user (anonymous:anonymous if the user is not
// logged in).
Identity string `json:"identity,omitempty"`
// The email of the user. Optional, default "".
Email string `json:"email,omitempty"`
// The URL of the user avatar. Optional, default "".
Picture string `son:"picture,omitempty"`
// The token that authorizes and authenticates the requests.
AccessToken string `json:"accessToken,omitempty"`
// Expiration time (unix timestamp) of the access token.
//
// If zero, the access token does not expire.
AccessTokenExpiry int64 `json:"accessTokenExpiry,omitempty"`
}
// getAuthState returns data about the current user and the access token
// associated with the current session.
func getAuthState(c *router.Context) error {
user := auth.CurrentUser(c.Context)
var state *authState
if user.Identity == identity.AnonymousIdentity {
state = &authState{
Identity: string(user.Identity),
}
} else {
session := auth.GetState(c.Context).Session()
if session == nil {
return errors.New("request not authenticated via secure cookies", grpcutil.UnauthenticatedTag)
}
token, err := session.AccessToken(c.Context)
if err != nil {
return err
}
state = &authState{
Identity: string(user.Identity),
Email: user.Email,
Picture: user.Picture,
AccessToken: token.AccessToken,
AccessTokenExpiry: token.Expiry.Unix(),
}
}
c.Writer.Header().Add("Content-Type", "application/json")
err := json.NewEncoder(c.Writer).Encode(state)
return errors.Annotate(err, "failed to JSON encode output").Tag(grpcutil.InternalTag).Err()
}