Address review comments

ts/receiver/receiver.ts

@@ -151,13 +151,6 @@ async function handleRequestDetail(
     envelope.senderIdentity = senderIdentity;
   }
 
-  // TODO: 'source' is almost certainly undefined here (sealed sender),
-  // so this check is not appropriate here
-  const blocked = await isBlocked(envelope.source);
-  if (blocked) {
-    return;
-  }
-
   envelope.id = envelope.serverGuid || window.getGuid();
   envelope.serverTimestamp = envelope.serverTimestamp
     ? envelope.serverTimestamp.toNumber()

ts/session/snode_api/swarmPolling.ts

@@ -56,11 +56,13 @@ export class SwarmPolling {
     this.groupPubkeys.push(pubkey);
   }
 
-  public addPubkey(pubkey: PubKey) {
+  public addPubkey(pk: PubKey | string) {
+    const pubkey = PubKey.cast(pk);
     this.pubkeys.push(pubkey);
   }
 
-  public removePubkey(pubkey: PubKey) {
+  public removePubkey(pk: PubKey | string) {
+    const pubkey = PubKey.cast(pk);
     this.pubkeys = this.pubkeys.filter(key => !pubkey.isEqual(key));
     this.groupPubkeys = this.groupPubkeys.filter(key => !pubkey.isEqual(key));
   }
@@ -68,9 +70,9 @@ export class SwarmPolling {
   protected async pollOnceForKey(pubkey: PubKey, isGroup: boolean) {
     // NOTE: sometimes pubkey is string, sometimes it is object, so
     // accept both until this is fixed:
-    const pk = (pubkey.key ? pubkey.key : pubkey) as string;
+    const pkStr = pubkey.key;
 
-    const snodes = await getSnodesFor(pk);
+    const snodes = await getSnodesFor(pkStr);
 
     // Select nodes for which we already have lastHashes
     const alreadyPolled = snodes.filter(
@@ -106,7 +108,7 @@ export class SwarmPolling {
     const newMessages = await this.handleSeenMessages(messages);
 
     newMessages.forEach((m: Message) => {
-      const options = isGroup ? { conversationId: pk } : {};
+      const options = isGroup ? { conversationId: pkStr } : {};
       processMessage(m.data, options);
     });
   }
@@ -119,7 +121,7 @@ export class SwarmPolling {
   ): Promise<Array<any>> {
     const edkey = node.pubkey_ed25519;
 
-    const pkStr = (pubkey.key ? pubkey.key : pubkey) as string;
+    const pkStr = pubkey.key;
 
     const prevHash = await this.getLastHash(edkey, pkStr);
 
@@ -197,7 +199,7 @@ export class SwarmPolling {
     hash: string,
     expiration: number
   ): Promise<void> {
-    const pkStr = (pubkey.key ? pubkey.key : pubkey) as string;
+    const pkStr = pubkey.key;
 
     await Data.updateLastHash({
       convoId: pkStr,