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syntax = "proto3";

package remoteu2f;

// Generic empty message, for RPCs that don't need one.
message Void {
}

// Generic message containing a request key and URL.
message Url {
	string key = 1;
	string url = 2;
}

// Prepare an operation.
message Prepare {
	// Generic json content to return.
	// This is a marshalled version of u2f.WebRegisterRequest or
	// u2f.WebSignRequest, depending on the operation.
	// We don't need to access this directly in the proxy, so we keep this
	// opaque and decode it again at javascript.
	bytes json = 1;

	// User-readable message to show on the web page.
	string msg = 2;

	// Request type, used only for selecting the web page template (no
	// functional behaviour difference from an RPC perspective).
	enum RType {
		UNKNOWN = 0;
		REGISTER = 1;
		AUTHENTICATE = 2;
	}
	RType rtype = 3;
}

// Operation response.
message Response {
	bytes json = 1;
}


service RemoteU2F {
	rpc PrepareOp(Prepare) returns (Url);
	rpc GetOpResponse(Url) returns (Response);
	rpc GetAppID(Void) returns (Url);
}