Add KeygenStep, only show ExtensionStep when window.nostr is present

src/features/nostr/NKeyStorage.ts

@@ -77,10 +77,11 @@ export class NKeyStorage implements ReadonlyMap<string, NostrSigner> {
     return this.#keypairs.has(pubkey);
   }
 
-  add(secretKey: Uint8Array): void {
+  add(secretKey: Uint8Array): NostrSigner {
     const pubkey = getPublicKey(secretKey);
     this.#keypairs.set(pubkey, secretKey);
     this.#syncStorage();
+    return this.get(pubkey)!;
   }
 
   *entries(): IterableIterator<[string, NostrSigner]> {

src/features/ui/components/modals/nostr-signin-modal/components/emoji-graphic.tsx

@@ -10,7 +10,7 @@ interface IEmojiGraphic {
 const EmojiGraphic: React.FC<IEmojiGraphic> = ({ emoji }) => {
   return (
     <div className='flex items-center justify-center'>
-      <div className='my-6 rounded-full bg-gray-100 p-8 dark:bg-gray-800'>
+      <div className='rounded-full bg-gray-100 p-8 dark:bg-gray-800'>
         <Emoji className='h-24 w-24' emoji={emoji} />
       </div>
     </div>

src/features/ui/components/modals/nostr-signin-modal/nostr-signin-modal.tsx

@@ -1,9 +1,11 @@
+import { NostrSigner } from 'nspec';
 import React, { useState } from 'react';
 
 import AccountStep from './steps/account-step';
 import ExtensionStep from './steps/extension-step';
 import IdentityStep from './steps/identity-step';
 import KeyStep from './steps/key-step';
+import KeygenStep from './steps/keygen-step';
 import RegisterStep from './steps/register-step';
 
 interface INostrSigninModal {
@@ -11,8 +13,9 @@ interface INostrSigninModal {
 }
 
 const NostrSigninModal: React.FC<INostrSigninModal> = ({ onClose }) => {
-  const [step, setStep] = useState(0);
+  const [step, setStep] = useState(window.nostr ? 0 : 1);
 
+  const [, setSigner] = useState<NostrSigner | undefined>();
   const [accountId, setAccountId] = useState<string | undefined>();
 
   const handleClose = () => onClose('NOSTR_SIGNIN');
@@ -28,6 +31,8 @@ const NostrSigninModal: React.FC<INostrSigninModal> = ({ onClose }) => {
       return <AccountStep accountId={accountId!} setStep={setStep}  onClose={handleClose} />;
     case 4:
       return <RegisterStep onClose={handleClose} />;
+    case 5:
+      return <KeygenStep setSigner={setSigner} setStep={setStep} onClose={handleClose} />;
     default:
       return null;
   }

src/features/ui/components/modals/nostr-signin-modal/steps/identity-step.tsx

@@ -53,7 +53,9 @@ const IdentityStep: React.FC<IIdentityStep> = ({ setAccountId, setStep, onClose
     <Modal title={<FormattedMessage id='nostr_signin.identity.title' defaultMessage='Who are you?' />} onClose={onClose}>
       <Form>
         <Stack className='mt-3' space={3}>
+          <div className='my-3'>
             <NostrExtensionIndicator />
+          </div>
 
           <EmojiGraphic emoji='🕵️' />
 

src/features/ui/components/modals/nostr-signin-modal/steps/key-step.tsx

@@ -14,13 +14,13 @@ interface IKeyStep {
 const KeyStep: React.FC<IKeyStep> = ({ setStep, onClose }) => {
   return (
     <Modal title={<FormattedMessage id='nostr_signin.key.title' defaultMessage='You need a key to continue' />} onClose={onClose}>
-      <Stack className='my-3' space={6} justifyContent='center'>
+      <Stack className='my-3' space={6}>
         <NostrExtensionIndicator />
 
         <EmojiGraphic emoji='🔑' />
 
         <Stack space={3} alignItems='center'>
-          <Button theme='accent' size='lg'>
+          <Button theme='accent' size='lg' onClick={() => setStep(5)}>
             Generate key
           </Button>
 

src/features/ui/components/modals/nostr-signin-modal/steps/keygen-step.tsx

@@ -0,0 +1,62 @@
+import { generateSecretKey, getPublicKey, nip19 } from 'nostr-tools';
+import { NostrSigner } from 'nspec';
+import React, { useMemo, useState } from 'react';
+import { FormattedMessage } from 'react-intl';
+
+import { Button, Stack, Modal } from 'soapbox/components/ui';
+import { NKeys } from 'soapbox/features/nostr/keys';
+import { useInstance } from 'soapbox/hooks';
+import { download } from 'soapbox/utils/download';
+import { slugify } from 'soapbox/utils/input';
+
+import EmojiGraphic from '../components/emoji-graphic';
+
+interface IKeygenStep {
+  setSigner(signer: NostrSigner): void;
+  setStep(step: number): void;
+  onClose(): void;
+}
+
+const KeygenStep: React.FC<IKeygenStep> = ({ setSigner, setStep, onClose }) => {
+  const instance = useInstance();
+
+  const secretKey = useMemo(() => generateSecretKey(), []);
+  const pubkey = useMemo(() => getPublicKey(secretKey), [secretKey]);
+
+  const nsec = useMemo(() => nip19.nsecEncode(secretKey), [secretKey]);
+  const npub = useMemo(() => nip19.npubEncode(pubkey), [pubkey]);
+
+  const [downloaded, setDownloaded] = useState(false);
+
+  const handleDownload = () => {
+    download(nsec, `${slugify(instance.title)}-${npub.slice(5, 9)}.nsec`);
+    setDownloaded(true);
+  };
+
+  const handleNext = () => {
+    const signer = NKeys.add(secretKey);
+    setSigner(signer);
+  };
+
+  return (
+    <Modal title={<FormattedMessage id='nostr_signin.keygen.title' defaultMessage='Your new key' />} onClose={onClose}>
+      <Stack className='my-3' space={6}>
+        <EmojiGraphic emoji='🔑' />
+
+        <Stack alignItems='center'>
+          <Button theme='primary' size='lg' icon={require('@tabler/icons/download.svg')} onClick={handleDownload}>
+            Download key
+          </Button>
+        </Stack>
+
+        <Stack space={3} alignItems='end'>
+          <Button theme='accent' disabled={!downloaded} size='lg' onClick={handleNext}>
+            Next
+          </Button>
+        </Stack>
+      </Stack>
+    </Modal>
+  );
+};
+
+export default KeygenStep;

src/utils/input.ts

@@ -8,6 +8,15 @@ const normalizeUsername = (username: string): string => {
   }
 };
 
+function slugify(text: string): string {
+  return text
+    .trim()
+    .toLowerCase()
+    .replace(/[^\w]/g, '-') // replace non-word characters with a hyphen
+    .replace(/-+/g, '-'); // replace multiple hyphens with a single hyphen
+}
+
 export {
   normalizeUsername,
+  slugify,
 };