WIP Allow users to zap photos

Working, basic implementation of zaps for photos. No fetching or
rendering of receipts yet.

tests/helpers/mock-nostr.js

@@ -100,10 +100,76 @@ export class MockNostrRelayService extends Service {
   }
 }
 
+export class MockNostrZapService extends Service {
+  @tracked _lightningAddress = 'user@example.com';
+  @tracked _endpoint = {
+    callback: 'https://example.com/callback',
+    minSendable: 1000,
+    maxSendable: 100_000_000,
+    allowsNostr: true,
+    nostrPubkey: 'c'.repeat(64),
+  };
+  @tracked _webLNAvailable = false;
+  @tracked _zapResult = {
+    invoice: 'lnbc1u1pjtestinvoice1234567890',
+    zapRequest: { id: 'zap-req-1' },
+  };
+  @tracked _parsedInvoice = {
+    amount: 1_000_000,
+    expiry: 9_999_999_999,
+    description: 'test zap',
+  };
+
+  @tracked recipientRelays = null;
+
+  getLightningAddress() {
+    return this._lightningAddress;
+  }
+
+  async resolveLnurl() {
+    if (!this._endpoint.allowsNostr) {
+      throw new Error('This lightning address does not support Nostr zaps');
+    }
+    return this._endpoint;
+  }
+
+  async loadRecipientRelays() {
+    this.recipientRelays = ['wss://relay.test'];
+    return this.recipientRelays;
+  }
+
+  getZapRelays() {
+    return (
+      this.recipientRelays || [
+        'wss://relay.damus.io',
+        'wss://nos.lol',
+        'wss://relay.primal.net',
+      ]
+    );
+  }
+
+  hasWebLN() {
+    return this._webLNAvailable;
+  }
+
+  async zap() {
+    return this._zapResult;
+  }
+
+  parseInvoice() {
+    return this._parsedInvoice;
+  }
+
+  async payWithWebln() {
+    return {};
+  }
+}
+
 export function setupNostrMocks(hooks) {
   hooks.beforeEach(function () {
     this.owner.register('service:nostrAuth', MockNostrAuthService);
     this.owner.register('service:nostrData', MockNostrDataService);
     this.owner.register('service:nostrRelay', MockNostrRelayService);
+    this.owner.register('service:nostrZap', MockNostrZapService);
   });
 }