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authenticator.go
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authenticator.go
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package auth
import (
"errors"
"fmt"
"math/rand"
"net/http"
"strings"
internal_errors "github.com/bricks-cloud/bricksllm/internal/errors"
"github.com/bricks-cloud/bricksllm/internal/hasher"
"github.com/bricks-cloud/bricksllm/internal/telemetry"
metricname "github.com/bricks-cloud/bricksllm/internal/telemetry/metric_name"
"github.com/bricks-cloud/bricksllm/internal/key"
"github.com/bricks-cloud/bricksllm/internal/provider"
"github.com/bricks-cloud/bricksllm/internal/route"
)
type providerSettingsManager interface {
GetSettingViaCache(id string) (*provider.Setting, error)
GetSettingsViaCache(ids []string) ([]*provider.Setting, error)
}
type routesManager interface {
GetRouteFromMemDb(path string) *route.Route
}
type keysCache interface {
GetKeyViaCache(hash string) (*key.ResponseKey, error)
}
type keyStorage interface {
GetKeyByHash(hash string) (*key.ResponseKey, error)
}
type Authenticator struct {
psm providerSettingsManager
kc keysCache
rm routesManager
ks keyStorage
}
func NewAuthenticator(psm providerSettingsManager, kc keysCache, rm routesManager, ks keyStorage) *Authenticator {
return &Authenticator{
psm: psm,
kc: kc,
rm: rm,
ks: ks,
}
}
func getApiKey(req *http.Request) (string, error) {
list := []string{
req.Header.Get("x-api-key"),
req.Header.Get("api-key"),
}
split := strings.Split(req.Header.Get("Authorization"), " ")
if len(split) >= 2 {
list = append(list, split[1])
}
for _, key := range list {
if len(key) != 0 {
return key, nil
}
}
return "", internal_errors.NewAuthError("api key not found in header")
}
func rewriteHttpAuthHeader(req *http.Request, setting *provider.Setting) error {
uri := req.URL.RequestURI()
if strings.HasPrefix(uri, "/api/routes") {
return nil
}
apiKey := setting.GetParam("apikey")
if strings.HasPrefix(uri, "/api/providers/vllm") {
if len(apiKey) != 0 {
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", apiKey))
}
return nil
}
if len(apiKey) == 0 {
return errors.New("api key is empty in provider setting")
}
if strings.HasPrefix(uri, "/api/providers/anthropic") {
req.Header.Set("x-api-key", apiKey)
return nil
}
if strings.HasPrefix(uri, "/api/providers/azure") {
req.Header.Set("api-key", apiKey)
return nil
}
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", apiKey))
return nil
}
func (a *Authenticator) canKeyAccessCustomRoute(path string, keyId string) error {
trimed := strings.TrimPrefix(path, "/api/routes")
rc := a.rm.GetRouteFromMemDb(trimed)
if rc == nil {
return internal_errors.NewNotFoundError("route not found")
}
for _, kid := range rc.KeyIds {
if kid == keyId {
return nil
}
}
return internal_errors.NewAuthError("not authorized")
}
func (a *Authenticator) getProviderSettingsThatCanAccessCustomRoute(path string, settings []*provider.Setting) []*provider.Setting {
trimed := strings.TrimPrefix(path, "/api/routes")
rc := a.rm.GetRouteFromMemDb(trimed)
selected := []*provider.Setting{}
if rc == nil {
return []*provider.Setting{}
}
target := map[string]bool{}
for _, s := range rc.Steps {
target[s.Provider] = true
}
source := map[string]*provider.Setting{}
for _, s := range settings {
source[s.Provider] = s
}
for p := range target {
if source[p] == nil {
return []*provider.Setting{}
}
selected = append(selected, source[p])
}
return selected
}
func canAccessPath(provider string, path string) bool {
if provider == "openai" && !strings.HasPrefix(path, "/api/providers/openai") {
return false
}
if provider == "azure" && !strings.HasPrefix(path, "/api/providers/azure/openai") {
return false
}
if provider == "anthropic" && !strings.HasPrefix(path, "/api/providers/anthropic") {
return false
}
if provider == "vllm" && !strings.HasPrefix(path, "/api/providers/vllm") {
return false
}
return true
}
type notFoundError interface {
Error() string
NotFound()
}
func anonymize(input string) string {
if len(input) == 0 {
return ""
}
if len(input) <= 5 && len(input) >= 1 {
return string(input[0]) + "*****"
}
return string(input[0:5]) + "**********************************************"
}
func (a *Authenticator) AuthenticateHttpRequest(req *http.Request) (*key.ResponseKey, []*provider.Setting, error) {
raw, err := getApiKey(req)
if err != nil {
return nil, nil, err
}
hash := hasher.Hash(raw)
key, err := a.kc.GetKeyViaCache(hash)
if key != nil {
telemetry.Incr(metricname.COUNTER_AUTHENTICATOR_FOUND_KEY_FROM_MEMDB, nil, 1)
}
if key == nil {
key, err = a.kc.GetKeyViaCache(raw)
}
if err != nil {
_, ok := err.(notFoundError)
if ok {
return nil, nil, internal_errors.NewAuthError(fmt.Sprintf("key %s is not found", anonymize(raw)))
}
return nil, nil, err
}
if key == nil {
return nil, nil, internal_errors.NewAuthError(fmt.Sprintf("key %s is not found", anonymize(raw)))
}
if key.Revoked {
return nil, nil, internal_errors.NewAuthError(fmt.Sprintf("key %s has been revoked", anonymize(raw)))
}
if strings.HasPrefix(req.URL.Path, "/api/routes") {
err = a.canKeyAccessCustomRoute(req.URL.Path, key.KeyId)
if err != nil {
return nil, nil, err
}
}
settingIds := key.GetSettingIds()
allSettings := []*provider.Setting{}
selected := []*provider.Setting{}
for _, settingId := range settingIds {
setting, _ := a.psm.GetSettingViaCache(settingId)
if setting == nil {
telemetry.Incr("bricksllm.authenticator.authenticate_http_request.get_setting_error", nil, 1)
continue
}
if canAccessPath(setting.Provider, req.URL.Path) {
selected = append(selected, setting)
}
allSettings = append(allSettings, setting)
}
if strings.HasPrefix(req.URL.Path, "/api/routes") {
selected = a.getProviderSettingsThatCanAccessCustomRoute(req.URL.Path, allSettings)
if len(selected) == 0 {
return nil, nil, internal_errors.NewAuthError(fmt.Sprintf("provider settings associated with the key %s are not compatible with the route", anonymize(raw)))
}
}
if len(selected) != 0 {
used := selected[0]
if key.RotationEnabled {
used = selected[rand.Intn(len(selected))]
}
err := rewriteHttpAuthHeader(req, used)
if err != nil {
return nil, nil, err
}
return key, selected, nil
}
return nil, nil, internal_errors.NewAuthError(fmt.Sprintf("provider setting not found for key %s", raw))
}