D5885.id19440.diff
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	diff --git a/keyserver/src/responders/siwe-nonce-responders.js b/keyserver/src/responders/siwe-nonce-responders.js
	--- a/keyserver/src/responders/siwe-nonce-responders.js
	+++ b/keyserver/src/responders/siwe-nonce-responders.js
	@@ -1,7 +1,27 @@
	// @flow

	-async function siweNonceResponder(): Promise<string> {
	- return 'UNIMPLEMENTED';
	+import { generateNonce } from 'siwe';
	+import t from 'tcomb';
	+
	+import type {
	+ SIWENonceRequest,
	+ SIWENonceResponse,
	+} from 'lib/types/siwe-types.js';
	+import { tShape } from 'lib/utils/validation-utils';
	+
	+import type { Viewer } from '../session/viewer.js';
	+import { validateInput } from '../utils/validation-utils.js';
	+
	+const siweNonceRequestInputValidator = tShape({
	+ walletAddress: t.String,
	+});
	+async function siweNonceResponder(
	+ viewer: Viewer,
	+ input: any,
	+): Promise<SIWENonceResponse> {
	+ const request: SIWENonceRequest = input;
	+ await validateInput(viewer, siweNonceRequestInputValidator, request);
	+ return { nonce: generateNonce() };
	}

	export { siweNonceResponder };
	diff --git a/lib/types/siwe-types.js b/lib/types/siwe-types.js
	new file mode 100644
	--- /dev/null
	+++ b/lib/types/siwe-types.js
	@@ -0,0 +1,9 @@
	+// @flow
	+
	+export type SIWENonceRequest = {
	+ +walletAddress: string,
	+};
	+
	+export type SIWENonceResponse = {
	+ +nonce: string,
	+};