Implement event deletion logic with relay handling in App.svelte and add connectToRelay method in NostrClient

This commit enhances the event deletion process by introducing conditional publishing to external relays based on user roles and ownership. It also adds a new method in the NostrClient class to connect to a single relay, improving the flexibility of relay management. The version is bumped to v0.12.3 to reflect these changes.

app/web/src/nostr.js

@@ -73,6 +73,61 @@ class NostrClient {
     await new Promise((resolve) => setTimeout(resolve, 1000));
   }
 
+  async connectToRelay(relayUrl) {
+    console.log(`Connecting to single relay: ${relayUrl}`);
+
+    return new Promise((resolve) => {
+      try {
+        console.log(`Attempting to connect to ${relayUrl}`);
+        const ws = new WebSocket(relayUrl);
+
+        ws.onopen = () => {
+          console.log(`✓ Successfully connected to ${relayUrl}`);
+          resolve(true);
+        };
+
+        ws.onerror = (error) => {
+          console.error(`✗ Error connecting to ${relayUrl}:`, error);
+          resolve(false);
+        };
+
+        ws.onclose = (event) => {
+          console.warn(
+            `Connection closed to ${relayUrl}:`,
+            event.code,
+            event.reason,
+          );
+        };
+
+        ws.onmessage = (event) => {
+          console.log(`Message from ${relayUrl}:`, event.data);
+          try {
+            this.handleMessage(relayUrl, JSON.parse(event.data));
+          } catch (error) {
+            console.error(
+              `Failed to parse message from ${relayUrl}:`,
+              error,
+              event.data,
+            );
+          }
+        };
+
+        this.relays.set(relayUrl, ws);
+
+        // Timeout after 5 seconds
+        setTimeout(() => {
+          if (ws.readyState !== WebSocket.OPEN) {
+            console.warn(`Connection timeout for ${relayUrl}`);
+            resolve(false);
+          }
+        }, 5000);
+      } catch (error) {
+        console.error(`Failed to create WebSocket for ${relayUrl}:`, error);
+        resolve(false);
+      }
+    });
+  }
+
   handleMessage(relayUrl, message) {
     console.log(`Processing message from ${relayUrl}:`, message);
     const [type, subscriptionId, event, ...rest] = message;
@@ -238,6 +293,9 @@ class NostrClient {
 // Create a global client instance
 export const nostrClient = new NostrClient();
 
+// Export the class for creating new instances
+export { NostrClient };
+
 // IndexedDB helpers for caching events (kind 0 profiles)
 const DB_NAME = "nostrCache";
 const DB_VERSION = 1;