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google_public_key_cache.go
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google_public_key_cache.go
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package secure_backend
import (
"errors"
"fmt"
"sync"
"github.com/golang-jwt/jwt"
)
type googlePublicKeyCache struct {
logger *Logger
/*
Metadata server URL.
*/
metadataUrl string
lock *sync.Mutex
latestKey *googlePublicKey
offlineKeys map[string]*googlePublicKey
allKeys map[string]*googlePublicKey
}
func (it *googlePublicKeyCache) addOfflineKey(key *googlePublicKey) {
it.offlineKeys[key.kid] = key
if it.latestKey == nil {
it.latestKey = key
}
}
func (it *googlePublicKeyCache) refreshKeys() error {
it.lock.Lock()
defer it.lock.Unlock()
keys, err := getGooglePublicKeys(it.metadataUrl)
if err != nil {
return fmt.Errorf("Public key cache refresh failed: %w", err)
}
it.allKeys = make(map[string]*googlePublicKey)
for _, key := range it.offlineKeys {
it.allKeys[key.kid] = key
}
for _, key := range keys {
it.allKeys[key.kid] = key
}
return nil
}
func (it *googlePublicKeyCache) parseJwt(token string) (*googlePublicKey, *jwt.Token, error) {
// check latest
latest := it.latestKey
if latest != nil {
if parsed, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return latest.publicKey, nil
}); err == nil {
return latest, parsed, nil
}
}
// Try local cache.
keys := it.allKeys
for _, key := range keys {
parsedToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return key.publicKey, nil
})
if err == nil {
it.latestKey = key
return key, parsedToken, nil
}
}
it.logger.logError("public key not found on memory cache. refresh start.")
// Not found, refresh
err := it.refreshKeys()
if err != nil {
return nil, nil, err
} else {
keys = it.allKeys
}
// Try new local cache.
for _, key := range keys {
parsedToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return key.publicKey, nil
})
if err == nil {
it.latestKey = key
return key, parsedToken, nil
}
}
it.logger.logError("fatal, Public key not found on google repository")
// Not found public key.
return nil, nil, errors.New("signature validation failed in all public keys")
}
func newGooglePublicKeyCache(metadataUrl string, logger *Logger) *googlePublicKeyCache {
return &googlePublicKeyCache{
metadataUrl: metadataUrl,
logger: logger,
lock: new(sync.Mutex),
offlineKeys: make(map[string]*googlePublicKey),
}
}