package auth import ( "context" "google.golang.org/grpc/metadata" ) type Credential struct { App string Token string } func (c *Credential) GetRequestMetadata(context.Context, ...string) (map[string]string, error) { return map[string]string{ appKey: c.App, tokenKey: c.Token, }, nil } func (c *Credential) RequireTransportSecurity() bool { return false } func ParseCredential(ctx context.Context) Credential { var credential Credential md, ok := metadata.FromIncomingContext(ctx) if !ok { return credential } apps, tokens := md[appKey], md[tokenKey] if len(apps) == 0 || len(tokens) == 0 { return credential } app, token := apps[0], tokens[0] if len(app) == 0 || len(token) == 0 { return credential } credential.App = app credential.Token = token return credential }