feat: used sendDM method in contact form

src/controllers/NostrController.ts

@@ -0,0 +1,205 @@
+import {
+  Event,
+  EventTemplate,
+  SimplePool,
+  UnsignedEvent,
+  finalizeEvent,
+  nip04,
+  nip19,
+  verifyEvent,
+  generateSecretKey,
+  getPublicKey
+} from 'nostr-tools'
+import { EventEmitter } from 'tseep'
+import { SignedEvent, Keys } from '../types'
+
+export class NostrController extends EventEmitter {
+  private static instance: NostrController
+
+  private generatedKeys: Keys | undefined
+
+  private constructor() {
+    super()
+
+    this.generatedKeys = this.generateKeys()
+  }
+
+  public static getInstance(): NostrController {
+    if (!NostrController.instance) {
+      NostrController.instance = new NostrController()
+    }
+    return NostrController.instance
+  }
+
+  /**
+   * Function will publish provided event to the provided relays
+   */
+  publishEvent = async (event: Event, relays: string[]) => {
+    const simplePool = new SimplePool()
+    const promises = simplePool.publish(relays, event)
+
+    const results = await Promise.allSettled(promises)
+
+    const publishedRelays: string[] = []
+
+    results.forEach((result, index) => {
+      if (result.status === 'fulfilled') publishedRelays.push(relays[index])
+    })
+
+    if (publishedRelays.length === 0) {
+      const failedPublishes: any[] = []
+      const fallbackRejectionReason =
+        'Attempt to publish an event has been rejected with unknown reason.'
+
+      results.forEach((res, index) => {
+        if (res.status === 'rejected') {
+          failedPublishes.push({
+            relay: relays[index],
+            error: res.reason
+              ? res.reason.message || fallbackRejectionReason
+              : fallbackRejectionReason
+          })
+        }
+      })
+
+      throw failedPublishes
+    }
+
+    return publishedRelays
+  }
+
+  /**
+   * Signs an event with private key (if it is present in local storage) or
+   * with browser extension (if it is present) or
+   * with nSecBunker instance.
+   * @param event - unsigned nostr event.
+   * @returns - a promised that is resolved with signed nostr event.
+   */
+  signEvent = async (
+    event: UnsignedEvent | EventTemplate
+  ): Promise<SignedEvent> => {
+    if (!this.generatedKeys) {
+      throw new Error(`Private & public key pair is not found.`)
+    }
+
+    const { private: nsec } = this.generatedKeys
+    const privateKey = nip19.decode(nsec).data as Uint8Array
+
+    const signedEvent = finalizeEvent(event, privateKey)
+
+    this.verifySignedEvent(signedEvent)
+
+    return Promise.resolve(signedEvent)
+  }
+
+  nip04Encrypt = async (receiver: string, content: string) => {
+    if (!this.generatedKeys) {
+      throw new Error(`Private & public key pair is not found.`)
+    }
+
+    const { private: nsec } = this.generatedKeys
+    const privateKey = nip19.decode(nsec).data as Uint8Array
+
+    const encrypted = await nip04.encrypt(privateKey, receiver, content)
+
+    return encrypted
+  }
+
+  /**
+   * Sends a Direct Message (DM) to a recipient, encrypting the content and handling authentication.
+   * @param fileUrl The URL of the encrypted zip file to be included in the DM.
+   * @param encryptionKey The encryption key used to decrypt the zip file to be included in the DM.
+   * @param pubkey The public key of the recipient.
+   * @param isSigner Boolean indicating whether the recipient is a signer or viewer.
+   * @param setAuthUrl Function to set the authentication URL in the component state.
+   */
+  sendDM = async (pubkey: string, message: string) => {
+    // Set up timeout promise to handle encryption timeout
+    const timeoutPromise = new Promise<never>((_, reject) => {
+      setTimeout(() => {
+        reject(new Error('Timeout occurred'))
+      }, 60000) // Timeout duration = 60 seconds
+    })
+
+    // Encrypt the DM content, with timeout
+    const encrypted = await Promise.race([
+      this.nip04Encrypt(this.npubToHex(pubkey) as string, message),
+      timeoutPromise
+    ])
+
+    // Return if encryption failed
+    if (!encrypted) throw new Error('Message was not encrypted.')
+
+    // Construct event metadata for the DM
+    const event: EventTemplate = {
+      kind: 4, // DM event type
+      content: encrypted, // Encrypted DM content
+      created_at: Math.floor(Date.now() / 1000), // Current timestamp
+      tags: [['p', this.npubToHex(pubkey) as string]] // Tag with recipient's public key
+    }
+
+    // Sign the DM event
+    const signedEvent = await this.signEvent(event)
+
+    // Return if event signing failed
+    if (!signedEvent) throw new Error('Message was not signed.')
+
+    // These relay will be used to send a DM. Recipient has to read from these relays to receive a DM.
+    const relays = [
+      'wss://relay.damus.io/',
+      'wss://nos.lol/',
+      'wss://relay.snort.social'
+    ]
+
+    // Publish the signed DM event to the recipient's read relays
+    return await this.publishEvent(signedEvent, relays)
+  }
+
+  /**
+   * @param hexKey hex private or public key
+   * @returns whether or not is key valid
+   */
+  validateHex = (hexKey: string) => {
+    return hexKey.match(/^[a-f0-9]{64}$/)
+  }
+
+  /**
+   * NPUB provided - it will convert NPUB to HEX
+   * HEX provided - it will return HEX
+   *
+   * @param pubKey in NPUB, HEX format
+   * @returns HEX format
+   */
+  npubToHex = (pubKey: string): string | null => {
+    // If key is NPUB
+    if (pubKey.startsWith('npub1')) {
+      try {
+        return nip19.decode(pubKey).data as string
+      } catch (error) {
+        return null
+      }
+    }
+
+    // valid hex key
+    if (this.validateHex(pubKey)) return pubKey
+
+    // Not a valid hex key
+    return null
+  }
+
+  generateKeys = (): Keys => {
+    const nsec = generateSecretKey()
+
+    return { private: nip19.nsecEncode(nsec), public: getPublicKey(nsec) }
+  }
+
+  verifySignedEvent = (event: SignedEvent) => {
+    const isGood = verifyEvent(event)
+
+    if (!isGood) {
+      throw new Error(
+        'Signed event did not pass verification. Check sig, id and pubkey.'
+      )
+    }
+  }
+}