/
auth.go
57 lines (49 loc) · 1.21 KB
/
auth.go
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package bootstrap
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
type secretChecker struct {
cfg Config
}
func newSecretChecker(cfg Config) *secretChecker {
return &secretChecker{cfg: cfg}
}
func (c *secretChecker) check(ctx context.Context, full string) error {
if c.cfg.GetSecret() == "" {
return nil
}
for _, v := range c.cfg.GetSecretWhitelist() {
if v == full {
return nil
}
}
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return status.Errorf(codes.InvalidArgument, "Retrieving metadata is failed")
}
return c.checkMD(md)
}
func (c *secretChecker) checkMD(md metadata.MD) error {
authHeader, ok := md["secret"]
if !ok {
return status.Errorf(codes.Unauthenticated, "secret is not supplied")
}
token := authHeader[0]
if token != c.cfg.GetSecret() {
return status.Errorf(codes.Unauthenticated, "secret does not match")
}
return nil
}
func (c *secretChecker) Intercept(ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler) (interface{}, error) {
if err := c.check(ctx, info.FullMethod); err != nil {
return nil, err
}
return handler(ctx, req)
}