feat: connection initiated by the client (#364)

src/providers/NostrProvider/nostrConnection.signer.ts

@@ -0,0 +1,73 @@
+import { ISigner, TDraftEvent } from '@/types'
+import { bytesToHex } from '@noble/hashes/utils'
+import { BunkerSigner as NBunkerSigner } from './nip46'
+
+export class NostrConnectionSigner implements ISigner {
+  signer: NBunkerSigner | null = null
+  private clientSecretKey: Uint8Array
+  private pubkey: string | null = null
+  private connectionString: string
+  private bunkerString: string | null = null
+  private readonly CONNECTION_TIMEOUT = 300_000 // 300 seconds
+
+  constructor(clientSecretKey: Uint8Array, connectionString: string) {
+    this.clientSecretKey = clientSecretKey
+    this.connectionString = connectionString
+  }
+
+  async login() {
+    if (this.pubkey) {
+      return {
+        bunkerString: this.bunkerString,
+        pubkey: this.pubkey
+      }
+    }
+
+    this.signer = new NBunkerSigner(this.clientSecretKey, this.connectionString, {
+      onauth: (url) => {
+        window.open(url, '_blank')
+      }
+    })
+    this.bunkerString = await this.signer.connect(this.CONNECTION_TIMEOUT)
+    this.pubkey = await this.signer.getPublicKey()
+    return {
+      bunkerString: this.bunkerString,
+      pubkey: this.pubkey
+    }
+  }
+
+  async getPublicKey() {
+    if (!this.signer) {
+      throw new Error('Not logged in')
+    }
+    if (!this.pubkey) {
+      this.pubkey = await this.signer.getPublicKey()
+    }
+    return this.pubkey
+  }
+
+  async signEvent(draftEvent: TDraftEvent) {
+    if (!this.signer) {
+      throw new Error('Not logged in')
+    }
+    return this.signer.signEvent(draftEvent)
+  }
+
+  async nip04Encrypt(pubkey: string, plainText: string) {
+    if (!this.signer) {
+      throw new Error('Not logged in')
+    }
+    return await this.signer.nip04Encrypt(pubkey, plainText)
+  }
+
+  async nip04Decrypt(pubkey: string, cipherText: string) {
+    if (!this.signer) {
+      throw new Error('Not logged in')
+    }
+    return await this.signer.nip04Decrypt(pubkey, cipherText)
+  }
+
+  getClientSecretKey() {
+    return bytesToHex(this.clientSecretKey)
+  }
+}