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token.go
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token.go
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package auth
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"sync"
"time"
"buf.build/gen/go/namespace/cloud/grpc/go/proto/namespace/private/sessions/sessionsv1betagrpc"
sessions "buf.build/gen/go/namespace/cloud/protocolbuffers/go/proto/namespace/private/sessions"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/types/known/durationpb"
"namespacelabs.dev/integrations/nsc"
"namespacelabs.dev/integrations/nsc/apienv"
"namespacelabs.dev/integrations/nsc/grpcapi"
)
type loadedToken struct {
BearerToken string
SessionToken string
dir string
debugLog io.Writer
mu sync.Mutex
sessionsClient sessionsv1betagrpc.UserSessionsServiceClient
}
func (t *loadedToken) client(ctx context.Context) (sessionsv1betagrpc.UserSessionsServiceClient, error) {
t.mu.Lock()
defer t.mu.Unlock()
if t.sessionsClient == nil {
conn, err := grpcapi.NewConnectionWithEndpoint(ctx, apienv.IAMEndpoint(), nil)
if err != nil {
return nil, err
}
t.sessionsClient = sessionsv1betagrpc.NewUserSessionsServiceClient(conn)
}
return t.sessionsClient, nil
}
func (t *loadedToken) IssueToken(ctx context.Context, minDur time.Duration, skipCache bool) (string, error) {
if t.SessionToken != "" {
issue := func(dur time.Duration) (string, error) {
cli, err := t.client(ctx)
if err != nil {
return "", err
}
res, err := cli.IssueTenantTokenFromSession(setGrpcBearer(ctx, t.SessionToken), &sessions.IssueTenantTokenFromSessionRequest{
TokenDuration: durationpb.New(dur),
})
if err != nil {
return "", err
}
return res.TenantToken, nil
}
if skipCache {
return issue(minDur)
}
sessionClaims, err := tokenClaims(t.debugLog, t.SessionToken)
if err != nil {
return "", err
}
if t.dir != "" {
cachePath := filepath.Join(t.dir, "token.cache")
cacheContents, err := os.ReadFile(cachePath)
if err != nil {
if !os.IsNotExist(err) {
return "", err
}
} else {
cacheClaims, err := tokenClaims(t.debugLog, string(cacheContents))
if err != nil {
return "", err
}
if cacheClaims.TenantID == sessionClaims.TenantID {
if cacheClaims.VerifyExpiresAt(time.Now().Add(minDur), true) {
return string(cacheContents), nil
}
}
}
}
dur := 2 * minDur
if dur > time.Hour {
dur = time.Hour
}
newToken, err := issue(dur)
if err == nil && t.dir != "" {
cachePath := filepath.Join(t.dir, "token.cache")
if err := os.WriteFile(cachePath, []byte(newToken), 0600); err != nil {
fmt.Fprintf(t.debugLog, "Failed to write token cache: %v\n", err)
}
}
return newToken, err
}
return t.BearerToken, nil
}
func LoadDefaults() (nsc.TokenSource, error) {
if tf := os.Getenv("NSC_TOKEN_FILE"); tf != "" {
return loadFromFile(tf)
}
t, err := loadFromFile("/var/run/nsc/token.json")
if err == nil {
return t, nil
}
if !os.IsNotExist(err) {
return nil, err
}
return LoadUserToken()
}
func LoadUserToken() (nsc.TokenSource, error) {
dir, err := configDir()
if err != nil {
return nil, err
}
token, err := loadFromFile(filepath.Join(dir, "token.json"))
if err != nil {
if os.IsNotExist(err) {
return nil, fmt.Errorf("you are not logged in to Namespace; try running `nsc login`")
}
}
return token, err
}
func LoadWorkloadToken() (nsc.TokenSource, error) {
if tf := os.Getenv("NSC_TOKEN_FILE"); tf != "" {
return loadFromFile(tf)
}
return loadFromFile("/var/run/nsc/token.json")
}
func loadFromFile(tokenFile string) (nsc.TokenSource, error) {
contents, err := os.ReadFile(tokenFile)
if err != nil {
return nil, err
}
var tj struct {
BearerToken string `json:"bearer_token"`
SessionToken string `json:"session_token"`
}
if err := json.Unmarshal(contents, &tj); err != nil {
return nil, fmt.Errorf("failed to parse token file: %w", err)
}
return &loadedToken{
BearerToken: tj.BearerToken,
SessionToken: tj.SessionToken,
dir: filepath.Dir(tokenFile),
debugLog: io.Discard,
}, nil
}
func configDir() (string, error) {
dir, err := os.UserConfigDir()
if err != nil {
return dir, err
}
return filepath.Join(dir, "ns"), nil
}
func setGrpcBearer(ctx context.Context, bearer string) context.Context {
return metadata.AppendToOutgoingContext(ctx, "authorization", fmt.Sprintf("Bearer %s", bearer))
}