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storage.go
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storage.go
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package storage
import (
"context"
"crypto/rand"
"crypto/rsa"
"errors"
"fmt"
"math/big"
"strings"
"sync"
"time"
jose "github.com/go-jose/go-jose/v3"
"github.com/google/uuid"
"github.com/zitadel/oidc/v3/pkg/oidc"
"github.com/zitadel/oidc/v3/pkg/op"
)
// serviceKey1 is a public key which will be used for the JWT Profile
// Authorization Grant the corresponding private key is in the service-key1.json
// (for demonstration purposes)
var serviceKey1 = &rsa.PublicKey{
N: func() *big.Int {
n, _ := new(
big.Int,
).SetString("00f6d44fb5f34ac2033a75e73cb65ff24e6181edc58845e75a560ac21378284977bb055b1a75b714874e2a2641806205681c09abec76efd52cf40984edcf4c8ca09717355d11ac338f280d3e4c905b00543bdb8ee5a417496cb50cb0e29afc5a0d0471fd5a2fa625bd5281f61e6b02067d4fe7a5349eeae6d6a4300bcd86eef331", 16)
return n
}(),
E: 65537,
}
var (
_ op.Storage = &Storage{}
_ op.ClientCredentialsStorage = &Storage{}
)
// storage implements the op.Storage interface
// typically you would implement this as a layer on top of your database
// for simplicity this example keeps everything in-memory
type Storage struct {
lock sync.Mutex
authRequests map[string]*AuthRequest
codes map[string]string
tokens map[string]*Token
clients map[string]*Client
userStore UserStore
services map[string]Service
refreshTokens map[string]*RefreshToken
signingKey signingKey
deviceCodes map[string]deviceAuthorizationEntry
userCodes map[string]string
serviceUsers map[string]*Client
}
type signingKey struct {
id string
algorithm jose.SignatureAlgorithm
key *rsa.PrivateKey
}
func (s *signingKey) SignatureAlgorithm() jose.SignatureAlgorithm {
return s.algorithm
}
func (s *signingKey) Key() any {
return s.key
}
func (s *signingKey) ID() string {
return s.id
}
type publicKey struct {
signingKey
}
func (s *publicKey) ID() string {
return s.id
}
func (s *publicKey) Algorithm() jose.SignatureAlgorithm {
return s.algorithm
}
func (s *publicKey) Use() string {
return "sig"
}
func (s *publicKey) Key() any {
return &s.key.PublicKey
}
func NewStorage(userStore UserStore) *Storage {
return NewStorageWithClients(userStore, clients)
}
func NewStorageWithClients(
userStore UserStore,
clients map[string]*Client,
) *Storage {
key, _ := rsa.GenerateKey(rand.Reader, 2048)
return &Storage{
authRequests: make(map[string]*AuthRequest),
codes: make(map[string]string),
tokens: make(map[string]*Token),
refreshTokens: make(map[string]*RefreshToken),
clients: clients,
userStore: userStore,
services: map[string]Service{
userStore.ExampleClientID(): {
keys: map[string]*rsa.PublicKey{
"key1": serviceKey1,
},
},
},
signingKey: signingKey{
id: uuid.NewString(),
algorithm: jose.RS256,
key: key,
},
deviceCodes: make(map[string]deviceAuthorizationEntry),
userCodes: make(map[string]string),
serviceUsers: map[string]*Client{
"sid1": {
id: "sid1",
secret: "verysecret",
grantTypes: []oidc.GrantType{
oidc.GrantTypeClientCredentials,
},
accessTokenType: op.AccessTokenTypeBearer,
},
},
}
}
// CheckUsernamePassword implements the `authenticate` interface of the login
func (s *Storage) CheckUsernamePassword(username, password, id string) error {
s.lock.Lock()
defer s.lock.Unlock()
request, ok := s.authRequests[id]
if !ok {
return fmt.Errorf("request not found")
}
// for demonstration purposes we'll check we'll have a simple user store and
// a plain text password. For real world scenarios, be sure to have the
// password
// hashed and salted (e.g. using bcrypt)
user := s.userStore.GetUserByUsername(username)
if user != nil && user.Password == password {
// be sure to set user id into the auth request after the user was
// checked, so that you'll be able to get more information about the
// user after the login
request.UserID = user.ID
// you will have to change some state on the request to guide the user
// through possible multiple steps of the login process in this example
// we'll simply check the username / password and set a boolean to true
// therefore we will also just check this boolean if the request / login
// has been finished
request.done = true
return nil
}
return fmt.Errorf("username or password wrong")
}
func (s *Storage) CheckUsernamePasswordSimple(username, password string) error {
s.lock.Lock()
defer s.lock.Unlock()
user := s.userStore.GetUserByUsername(username)
if user != nil && user.Password == password {
return nil
}
return fmt.Errorf("username or password wrong")
}
// CreateAuthRequest implements the op.Storage interface
// it will be called after parsing and validation of the authentication request
func (s *Storage) CreateAuthRequest(
ctx context.Context,
authReq *oidc.AuthRequest,
userID string,
) (op.AuthRequest, error) {
s.lock.Lock()
defer s.lock.Unlock()
if len(authReq.Prompt) == 1 && authReq.Prompt[0] == "none" {
// With prompt=none, there is no way for the user to log in
// so return error right away.
return nil, oidc.ErrLoginRequired()
}
// typically, you'll fill your storage / storage model with the information
// of the passed object
request := authRequestToInternal(authReq, userID)
// you'll also have to create a unique id for the request (this might be
// done by your database; we'll use a uuid)
request.ID = uuid.NewString()
// and save it in your database (for demonstration purposed we will use a
// simple map)
s.authRequests[request.ID] = request
// finally, return the request (which implements the AuthRequest interface
// of the OP
return request, nil
}
// AuthRequestByID implements the op.Storage interface
// it will be called after the Login UI redirects back to the OIDC endpoint
func (s *Storage) AuthRequestByID(
ctx context.Context,
id string,
) (op.AuthRequest, error) {
s.lock.Lock()
defer s.lock.Unlock()
request, ok := s.authRequests[id]
if !ok {
return nil, fmt.Errorf("request not found")
}
return request, nil
}
// AuthRequestByCode implements the op.Storage interface
// it will be called after parsing and validation of the token request (in an
// authorization code flow)
func (s *Storage) AuthRequestByCode(
ctx context.Context,
code string,
) (op.AuthRequest, error) {
// for this example we read the id by code and then get the request by id
requestID, ok := func() (string, bool) {
s.lock.Lock()
defer s.lock.Unlock()
requestID, ok := s.codes[code]
return requestID, ok
}()
if !ok {
return nil, fmt.Errorf("code invalid or expired")
}
return s.AuthRequestByID(ctx, requestID)
}
// SaveAuthCode implements the op.Storage interface
// it will be called after the authentication has been successful and before
// redirecting the user agent to the redirect_uri
// (in an authorization code flow)
func (s *Storage) SaveAuthCode(
ctx context.Context,
id string,
code string,
) error {
// for this example we'll just save the authRequestID to the code
s.lock.Lock()
defer s.lock.Unlock()
s.codes[code] = id
return nil
}
// DeleteAuthRequest implements the op.Storage interface
// it will be called after creating the token response (id and access tokens)
// for a valid
// - authentication request (in an implicit flow)
// - token request (in an authorization code flow)
func (s *Storage) DeleteAuthRequest(ctx context.Context, id string) error {
// you can simply delete all reference to the auth request
s.lock.Lock()
defer s.lock.Unlock()
delete(s.authRequests, id)
for code, requestID := range s.codes {
if id == requestID {
delete(s.codes, code)
return nil
}
}
return nil
}
// CreateAccessToken implements the op.Storage interface
// it will be called for all requests able to return an access token
// (Authorization Code Flow, Implicit Flow, JWT Profile, ...)
func (s *Storage) CreateAccessToken(
ctx context.Context,
request op.TokenRequest,
) (string, time.Time, error) {
var applicationID string
switch req := request.(type) {
case *AuthRequest:
// if authenticated for an app (auth code / implicit flow) we must save
// the client_id to the token
applicationID = req.ApplicationID
case op.TokenExchangeRequest:
applicationID = req.GetClientID()
}
token, err := s.accessToken(
applicationID,
"",
request.GetSubject(),
request.GetAudience(),
request.GetScopes(),
)
if err != nil {
return "", time.Time{}, err
}
return token.ID, token.Expiration, nil
}
// CreateAccessAndRefreshTokens implements the op.Storage interface
// it will be called for all requests able to return an access and refresh token
// (Authorization Code Flow, Refresh Token Request)
func (s *Storage) CreateAccessAndRefreshTokens(
ctx context.Context,
request op.TokenRequest,
currentRefreshToken string,
) (accessTokenID, newRefreshToken string, expiration time.Time, err error) {
// generate tokens via token exchange flow if request is relevant
if teReq, ok := request.(op.TokenExchangeRequest); ok {
return s.exchangeRefreshToken(ctx, teReq)
}
// get the information depending on the request type / implementation
applicationID, authTime, amr := getInfoFromRequest(request)
// if currentRefreshToken is empty (Code Flow) we will have to create a new
// refresh token
if currentRefreshToken == "" {
refreshTokenID := uuid.NewString()
accessToken, err := s.accessToken(
applicationID,
refreshTokenID,
request.GetSubject(),
request.GetAudience(),
request.GetScopes(),
)
if err != nil {
return "", "", time.Time{}, err
}
refreshToken, err := s.createRefreshToken(accessToken, amr, authTime)
if err != nil {
return "", "", time.Time{}, err
}
return accessToken.ID, refreshToken, accessToken.Expiration, nil
}
// if we get here, the currentRefreshToken was not empty, so the call is a
// refresh token request we therefore will have to check the
// currentRefreshToken and renew the refresh token
refreshToken, refreshTokenID, err := s.renewRefreshToken(
currentRefreshToken,
)
if err != nil {
return "", "", time.Time{}, err
}
accessToken, err := s.accessToken(
applicationID,
refreshTokenID,
request.GetSubject(),
request.GetAudience(),
request.GetScopes(),
)
if err != nil {
return "", "", time.Time{}, err
}
return accessToken.ID, refreshToken, accessToken.Expiration, nil
}
func (s *Storage) exchangeRefreshToken(
ctx context.Context,
request op.TokenExchangeRequest,
) (accessTokenID, newRefreshToken string, expiration time.Time, err error) {
applicationID := request.GetClientID()
authTime := request.GetAuthTime()
refreshTokenID := uuid.NewString()
accessToken, err := s.accessToken(
applicationID,
refreshTokenID,
request.GetSubject(),
request.GetAudience(),
request.GetScopes(),
)
if err != nil {
return "", "", time.Time{}, err
}
refreshToken, err := s.createRefreshToken(accessToken, nil, authTime)
if err != nil {
return "", "", time.Time{}, err
}
return accessToken.ID, refreshToken, accessToken.Expiration, nil
}
// TokenRequestByRefreshToken implements the op.Storage interface
// it will be called after parsing and validation of the refresh token request
func (s *Storage) TokenRequestByRefreshToken(
ctx context.Context,
refreshToken string,
) (op.RefreshTokenRequest, error) {
s.lock.Lock()
defer s.lock.Unlock()
token, ok := s.refreshTokens[refreshToken]
if !ok {
return nil, fmt.Errorf("invalid refresh_token")
}
return RefreshTokenRequestFromBusiness(token), nil
}
// TerminateSession implements the op.Storage interface
// it will be called after the user signed out, therefore the access and refresh
// token of the user of this client must be removed
func (s *Storage) TerminateSession(
ctx context.Context,
userID string,
clientID string,
) error {
s.lock.Lock()
defer s.lock.Unlock()
for _, token := range s.tokens {
if token.ApplicationID == clientID && token.Subject == userID {
delete(s.tokens, token.ID)
delete(s.refreshTokens, token.RefreshTokenID)
}
}
return nil
}
// GetRefreshTokenInfo looks up a refresh token and returns the token id and
// user id.
// If given something that is not a refresh token, it must return error.
func (s *Storage) GetRefreshTokenInfo(
ctx context.Context,
clientID string,
token string,
) (userID, tokenID string, err error) {
refreshToken, ok := s.refreshTokens[token]
if !ok {
return "", "", op.ErrInvalidRefreshToken
}
return refreshToken.UserID, refreshToken.ID, nil
}
// RevokeToken implements the op.Storage interface
// it will be called after parsing and validation of the token revocation
// request
func (s *Storage) RevokeToken(
ctx context.Context,
tokenIDOrToken string,
userID string,
clientID string,
) *oidc.Error {
// a single token was requested to be removed
s.lock.Lock()
defer s.lock.Unlock()
accessToken, ok := s.tokens[tokenIDOrToken] // tokenID
if ok {
if accessToken.ApplicationID != clientID {
return oidc.ErrInvalidClient().
WithDescription("token was not issued for this client")
}
// if it is an access token, just remove it
// you could also remove the corresponding refresh token if really
// necessary
delete(s.tokens, accessToken.ID)
return nil
}
refreshToken, ok := s.refreshTokens[tokenIDOrToken] // token
if !ok {
// if the token is neither an access nor a refresh token, just ignore
// it, the expected behaviour of
// being not valid (anymore) is achieved
return nil
}
if refreshToken.ApplicationID != clientID {
return oidc.ErrInvalidClient().
WithDescription("token was not issued for this client")
}
// if it is a refresh token, you will have to remove the access token as
// well
delete(s.refreshTokens, refreshToken.ID)
for _, accessToken := range s.tokens {
if accessToken.RefreshTokenID == refreshToken.ID {
delete(s.tokens, accessToken.ID)
return nil
}
}
return nil
}
// SigningKey implements the op.Storage interface
// it will be called when creating the OpenID Provider
func (s *Storage) SigningKey(ctx context.Context) (op.SigningKey, error) {
// in this example the signing key is a static rsa.PrivateKey and the
// algorithm used is RS256 you would obviously have a more complex
// implementation and store / retrieve the key from your database as well
return &s.signingKey, nil
}
// SignatureAlgorithms implements the op.Storage interface
// it will be called to get the sign
func (s *Storage) SignatureAlgorithms(
context.Context,
) ([]jose.SignatureAlgorithm, error) {
return []jose.SignatureAlgorithm{s.signingKey.algorithm}, nil
}
// KeySet implements the op.Storage interface
// it will be called to get the current (public) keys, among others for the
// keys_endpoint or for validating access_tokens on the userinfo_endpoint, ...
func (s *Storage) KeySet(ctx context.Context) ([]op.Key, error) {
// as mentioned above, this example only has a single signing key without
// key rotation,
// so it will directly use its public key
//
// when using key rotation you typically would store the public keys
// alongside the private keys in your database and give both of them an
// expiration date, with the public key having a longer lifetime
return []op.Key{&publicKey{s.signingKey}}, nil
}
// GetClientByClientID implements the op.Storage interface
// it will be called whenever information (type, redirect_uris, ...) about the
// client behind the client_id is needed
func (s *Storage) GetClientByClientID(
ctx context.Context,
clientID string,
) (op.Client, error) {
s.lock.Lock()
defer s.lock.Unlock()
client, ok := s.clients[clientID]
if !ok {
return nil, fmt.Errorf("client not found")
}
return RedirectGlobsClient(client), nil
}
// AuthorizeClientIDSecret implements the op.Storage interface
// it will be called for validating the client_id, client_secret on token or
// introspection requests
func (s *Storage) AuthorizeClientIDSecret(
ctx context.Context,
clientID, clientSecret string,
) error {
s.lock.Lock()
defer s.lock.Unlock()
client, ok := s.clients[clientID]
if !ok {
return fmt.Errorf("client not found")
}
// for this example we directly check the secret
// obviously you would not have the secret in plain text, but rather hashed
// and salted (e.g. using bcrypt)
if client.secret != clientSecret {
return fmt.Errorf("invalid secret")
}
return nil
}
// SetUserinfoFromScopes implements the op.Storage interface.
// Provide an empty implementation and use SetUserinfoFromRequest instead.
func (s *Storage) SetUserinfoFromScopes(
ctx context.Context,
userinfo *oidc.UserInfo,
userID, clientID string,
scopes []string,
) error {
return nil
}
// SetUserinfoFromRequests implements the op.CanSetUserinfoFromRequest
// interface. In the
// next major release, it will be required for op.Storage.
// It will be called for the creation of an id_token, so we'll just pass it to
// the private function without any further check
func (s *Storage) SetUserinfoFromRequest(
ctx context.Context,
userinfo *oidc.UserInfo,
token op.IDTokenRequest,
scopes []string,
) error {
return s.setUserinfo(
ctx,
userinfo,
token.GetSubject(),
token.GetClientID(),
scopes,
)
}
// SetUserinfoFromToken implements the op.Storage interface
// it will be called for the userinfo endpoint, so we read the token and pass
// the information from that to the private function
func (s *Storage) SetUserinfoFromToken(
ctx context.Context,
userinfo *oidc.UserInfo,
tokenID, subject, origin string,
) error {
token, ok := func() (*Token, bool) {
s.lock.Lock()
defer s.lock.Unlock()
token, ok := s.tokens[tokenID]
return token, ok
}()
if !ok {
return fmt.Errorf("token is invalid or has expired")
}
// the userinfo endpoint should support CORS. If it's not possible to
// specify a specific origin in the CORS handler, and you have to specify a
// wildcard (*) origin, then you could also check here if the origin which
// called the userinfo endpoint here directly
// note that the origin can be empty (if called by a web client)
//
// if origin != "" {
// client, ok := s.clients[token.ApplicationID]
// if !ok {
// return fmt.Errorf("client not found")
// }
// if err := checkAllowedOrigins(client.allowedOrigins, origin); err != nil
// {
// return err
// }
//}
return s.setUserinfo(
ctx,
userinfo,
token.Subject,
token.ApplicationID,
token.Scopes,
)
}
// SetIntrospectionFromToken implements the op.Storage interface
// it will be called for the introspection endpoint, so we read the token and
// pass the information from that to the private function
func (s *Storage) SetIntrospectionFromToken(
ctx context.Context,
introspection *oidc.IntrospectionResponse,
tokenID, subject, clientID string,
) error {
token, ok := func() (*Token, bool) {
s.lock.Lock()
defer s.lock.Unlock()
token, ok := s.tokens[tokenID]
return token, ok
}()
if !ok {
return fmt.Errorf("token is invalid or has expired")
}
// check if the client is part of the requested audience
for _, aud := range token.Audience {
if aud == clientID {
// the introspection response only has to return a boolean (active)
// if the token is active this will automatically be done by the
// library if you don't return an error you can also return further
// information about the user / associated token
// e.g. the userinfo (equivalent to userinfo endpoint)
userInfo := new(oidc.UserInfo)
err := s.setUserinfo(ctx, userInfo, subject, clientID, token.Scopes)
if err != nil {
return err
}
introspection.SetUserInfo(userInfo)
//...and also the requested scopes...
introspection.Scope = token.Scopes
//...and the client the token was issued to
introspection.ClientID = token.ApplicationID
return nil
}
}
return fmt.Errorf("token is not valid for this client")
}
// GetPrivateClaimsFromScopes implements the op.Storage interface
// it will be called for the creation of a JWT access token to assert claims for
// custom scopes
func (s *Storage) GetPrivateClaimsFromScopes(
ctx context.Context,
userID, clientID string,
scopes []string,
) (claims map[string]any, err error) {
return s.getPrivateClaimsFromScopes(ctx, userID, clientID, scopes)
}
func (s *Storage) getPrivateClaimsFromScopes(
ctx context.Context,
userID, clientID string,
scopes []string,
) (claims map[string]any, err error) {
for _, scope := range scopes {
switch scope {
case CustomScope:
claims = appendClaim(claims, CustomClaim, customClaim(clientID))
}
}
return claims, nil
}
// GetKeyByIDAndClientID implements the op.Storage interface
// it will be called to validate the signatures of a JWT (JWT Profile Grant and
// Authentication)
func (s *Storage) GetKeyByIDAndClientID(
ctx context.Context,
keyID, clientID string,
) (*jose.JSONWebKey, error) {
s.lock.Lock()
defer s.lock.Unlock()
service, ok := s.services[clientID]
if !ok {
return nil, fmt.Errorf("clientID not found")
}
key, ok := service.keys[keyID]
if !ok {
return nil, fmt.Errorf("key not found")
}
return &jose.JSONWebKey{
KeyID: keyID,
Use: "sig",
Key: key,
}, nil
}
// ValidateJWTProfileScopes implements the op.Storage interface
// it will be called to validate the scopes of a JWT Profile Authorization Grant
// request
func (s *Storage) ValidateJWTProfileScopes(
ctx context.Context,
userID string,
scopes []string,
) ([]string, error) {
allowedScopes := make([]string, 0)
for _, scope := range scopes {
if scope == oidc.ScopeOpenID {
allowedScopes = append(allowedScopes, scope)
}
}
return allowedScopes, nil
}
// Health implements the op.Storage interface
func (s *Storage) Health(ctx context.Context) error {
return nil
}
// createRefreshToken will store a refresh_token in-memory based on the provided
// information
func (s *Storage) createRefreshToken(
accessToken *Token,
amr []string,
authTime time.Time,
) (string, error) {
s.lock.Lock()
defer s.lock.Unlock()
token := &RefreshToken{
ID: accessToken.RefreshTokenID,
Token: accessToken.RefreshTokenID,
AuthTime: authTime,
AMR: amr,
ApplicationID: accessToken.ApplicationID,
UserID: accessToken.Subject,
Audience: accessToken.Audience,
Expiration: time.Now().Add(5 * time.Hour),
Scopes: accessToken.Scopes,
}
s.refreshTokens[token.ID] = token
return token.Token, nil
}
// renewRefreshToken checks the provided refresh_token and creates a new one
// based on the current
func (s *Storage) renewRefreshToken(
currentRefreshToken string,
) (string, string, error) {
s.lock.Lock()
defer s.lock.Unlock()
refreshToken, ok := s.refreshTokens[currentRefreshToken]
if !ok {
return "", "", fmt.Errorf("invalid refresh token")
}
// deletes the refresh token and all access tokens which were issued based
// on this refresh token
delete(s.refreshTokens, currentRefreshToken)
for _, token := range s.tokens {
if token.RefreshTokenID == currentRefreshToken {
delete(s.tokens, token.ID)
break
}
}
// creates a new refresh token based on the current one
token := uuid.NewString()
refreshToken.Token = token
refreshToken.ID = token
s.refreshTokens[token] = refreshToken
return token, refreshToken.ID, nil
}
// accessToken will store an access_token in-memory based on the provided
// information
func (s *Storage) accessToken(
applicationID, refreshTokenID, subject string,
audience, scopes []string,
) (*Token, error) {
s.lock.Lock()
defer s.lock.Unlock()
token := &Token{
ID: uuid.NewString(),
ApplicationID: applicationID,
RefreshTokenID: refreshTokenID,
Subject: subject,
Audience: audience,
Expiration: time.Now().Add(5 * time.Minute),
Scopes: scopes,
}
s.tokens[token.ID] = token
return token, nil
}
// setUserinfo sets the info based on the user, scopes and if necessary the
// clientID
func (s *Storage) setUserinfo(
ctx context.Context,
userInfo *oidc.UserInfo,
userID, clientID string,
scopes []string,
) (err error) {
s.lock.Lock()
defer s.lock.Unlock()
user := s.userStore.GetUserByID(userID)
if user == nil {
return fmt.Errorf("user not found")
}
for _, scope := range scopes {
switch scope {
case oidc.ScopeOpenID:
userInfo.Subject = user.ID
case oidc.ScopeEmail:
userInfo.Email = user.Email
userInfo.EmailVerified = oidc.Bool(user.EmailVerified)
case oidc.ScopeProfile:
userInfo.PreferredUsername = user.Username
userInfo.Name = user.FirstName + " " + user.LastName
userInfo.FamilyName = user.LastName
userInfo.GivenName = user.FirstName
userInfo.Locale = oidc.NewLocale(user.PreferredLanguage)
userInfo.AppendClaims("groups", user.Groups)
case oidc.ScopePhone:
userInfo.PhoneNumber = user.Phone
userInfo.PhoneNumberVerified = user.PhoneVerified
case CustomScope:
// you can also have a custom scope and assert public or custom
// claims based on that
userInfo.AppendClaims(CustomClaim, customClaim(clientID))
}
}
return nil
}
// ValidateTokenExchangeRequest implements the op.TokenExchangeStorage interface
// it will be called to validate parsed Token Exchange Grant request
func (s *Storage) ValidateTokenExchangeRequest(
ctx context.Context,
request op.TokenExchangeRequest,
) error {
if request.GetRequestedTokenType() == "" {
request.SetRequestedTokenType(oidc.RefreshTokenType)
}
// Just an example, some use cases might need this use case
if request.GetExchangeSubjectTokenType() == oidc.IDTokenType &&
request.GetRequestedTokenType() == oidc.RefreshTokenType {
return errors.New(
"exchanging id_token to refresh_token is not supported",
)
}
// Check impersonation permissions
if request.GetExchangeActor() == "" &&
!s.userStore.GetUserByID(request.GetExchangeSubject()).IsAdmin {
return errors.New("user doesn't have impersonation permission")
}
allowedScopes := make([]string, 0)
for _, scope := range request.GetScopes() {
if scope == oidc.ScopeAddress {
continue
}
if strings.HasPrefix(scope, CustomScopeImpersonatePrefix) {
subject := strings.TrimPrefix(scope, CustomScopeImpersonatePrefix)
request.SetSubject(subject)
}
allowedScopes = append(allowedScopes, scope)
}
request.SetCurrentScopes(allowedScopes)
return nil
}
// ValidateTokenExchangeRequest implements the op.TokenExchangeStorage interface
// Common use case is to store request for audit purposes. For this example we
// skip the storing.
func (s *Storage) CreateTokenExchangeRequest(
ctx context.Context,
request op.TokenExchangeRequest,
) error {
return nil
}
// GetPrivateClaimsFromScopesForTokenExchange implements the
// op.TokenExchangeStorage interface it will be called for the creation of an
// exchanged JWT access token to assert claims for custom scopes plus adding
// token exchange specific claims related to delegation or impersonation
func (s *Storage) GetPrivateClaimsFromTokenExchangeRequest(
ctx context.Context,
request op.TokenExchangeRequest,
) (claims map[string]any, err error) {
claims, err = s.getPrivateClaimsFromScopes(
ctx,
"",
request.GetClientID(),
request.GetScopes(),
)
if err != nil {
return nil, err
}
for k, v := range s.getTokenExchangeClaims(ctx, request) {
claims = appendClaim(claims, k, v)
}
return claims, nil
}
// SetUserinfoFromScopesForTokenExchange implements the op.TokenExchangeStorage
// interface it will be called for the creation of an id_token - we are using
// the same private function as for other flows, plus adding token exchange
// specific claims related to delegation or impersonation
func (s *Storage) SetUserinfoFromTokenExchangeRequest(
ctx context.Context,
userinfo *oidc.UserInfo,
request op.TokenExchangeRequest,
) error {
err := s.setUserinfo(
ctx,
userinfo,
request.GetSubject(),
request.GetClientID(),
request.GetScopes(),
)
if err != nil {
return err
}
for k, v := range s.getTokenExchangeClaims(ctx, request) {
userinfo.AppendClaims(k, v)
}
return nil
}
func (s *Storage) getTokenExchangeClaims(
ctx context.Context,
request op.TokenExchangeRequest,
) (claims map[string]any) {
for _, scope := range request.GetScopes() {
switch {
case strings.HasPrefix(scope, CustomScopeImpersonatePrefix) && request.GetExchangeActor() == "":
// Set actor subject claim for impersonation flow
claims = appendClaim(claims, "act", map[string]any{
"sub": request.GetExchangeSubject(),
})
}
}
// Set actor subject claim for delegation flow
// if request.GetExchangeActor() != "" {
// claims = appendClaim(claims, "act", map[string]any{
// "sub": request.GetExchangeActor(),
// })
// }
return claims
}
// getInfoFromRequest returns the clientID, authTime and amr depending on the
// op.TokenRequest type / implementation
func getInfoFromRequest(
req op.TokenRequest,
) (clientID string, authTime time.Time, amr []string) {
authReq, ok := req.(*AuthRequest) // Code Flow (with scope offline_access)
if ok {
return authReq.ApplicationID, authReq.authTime, authReq.GetAMR()
}