v0.3.5: Private blob encryption, blob prefetch, intent-based filtering, crypto refactoring

Private blob encryption:
- Encrypted posts (Friends/Circle/Direct) now encrypt attachment blobs with same CEK
- Public blobs unchanged, CID computed on ciphertext for private
- decrypt_blob_for_post/get_blob_for_post for transparent decryption on retrieval

Blob prefetch:
- Pull cycle and sync_with eagerly fetch missing blobs after post sync
- prefetch_blobs_from_peer scans for missing attachments, fetches via fallback chain
- Runs outside conn_mgr lock at Node level

Crypto refactoring:
- Extracted: encrypt/decrypt_bytes_with_cek, wrap/unwrap_cek_for_recipients
- unwrap_cek_for_recipient, unwrap_group_cek, random_cek
- encrypt_post_with_cek, encrypt_post_for_group_with_cek variants
- All existing functions refactored to delegate, 19 crypto tests pass

Intent-based filtering:
- intent_kind field on PostDto ("public"/"friends"/"circle"/"direct"/"unknown")
- Feed/MyPosts filter on intentKind !== 'direct' instead of visibility
- Messages filter with backward-compatible fallback for pre-intent posts
- get_post_intent storage method

IPC updates:
- resolve_blob_data helper using get_blob_for_post with network fallback
- sanitize_download_filename prevents path traversal
- get_blob_path accepts optional post_id_hex

Website:
- Mobile hamburger nav on all pages
- Mesh/Non-mesh N1 labels in network diagnostics

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -2746,7 +2746,7 @@ dependencies = [
 
 [[package]]
 name = "itsgoin-desktop"
-version = "0.3.4"
+version = "0.3.5"
 dependencies = [
  "anyhow",
  "base64 0.22.1",

crates/core/src/crypto.rs

@@ -37,40 +37,55 @@ fn derive_wrapping_key(shared_secret: &[u8; 32]) -> [u8; 32] {
     blake3::derive_key(CEK_WRAP_CONTEXT, shared_secret)
 }
 
-/// Encrypt a post's plaintext content for the given recipients.
-///
-/// Returns `(base64_ciphertext, Vec<WrappedKey>)` where:
-/// - base64_ciphertext is `base64(nonce(12) || ciphertext || tag(16))` for the content
-/// - Each WrappedKey contains the CEK encrypted for one recipient
-///
-/// The author (our_seed's corresponding NodeId) is always included as a recipient.
-pub fn encrypt_post(
-    plaintext: &str,
+// --- Crypto primitives ---
+
+/// Generate a random 32-byte Content Encryption Key (CEK).
+fn random_cek() -> [u8; 32] {
+    let mut cek = [0u8; 32];
+    rand::rng().fill_bytes(&mut cek);
+    cek
+}
+
+/// Encrypt arbitrary bytes with a CEK using ChaCha20-Poly1305.
+/// Returns `nonce(12) || ciphertext || tag(16)`.
+pub fn encrypt_bytes_with_cek(bytes: &[u8], cek: &[u8; 32]) -> Result<Vec<u8>> {
+    let cipher = ChaCha20Poly1305::new_from_slice(cek)
+        .map_err(|e| anyhow::anyhow!("cipher init: {}", e))?;
+    let mut nonce_bytes = [0u8; 12];
+    rand::rng().fill_bytes(&mut nonce_bytes);
+    let nonce = Nonce::from_slice(&nonce_bytes);
+    let ciphertext = cipher
+        .encrypt(nonce, bytes)
+        .map_err(|e| anyhow::anyhow!("encrypt: {}", e))?;
+    let mut payload = Vec::with_capacity(12 + ciphertext.len());
+    payload.extend_from_slice(&nonce_bytes);
+    payload.extend_from_slice(&ciphertext);
+    Ok(payload)
+}
+
+/// Decrypt bytes that were encrypted with `encrypt_bytes_with_cek`.
+/// Expects `nonce(12) || ciphertext || tag(16)`.
+pub fn decrypt_bytes_with_cek(payload: &[u8], cek: &[u8; 32]) -> Result<Vec<u8>> {
+    if payload.len() < 12 + 16 {
+        bail!("encrypted payload too short");
+    }
+    let nonce = Nonce::from_slice(&payload[..12]);
+    let cipher = ChaCha20Poly1305::new_from_slice(cek)
+        .map_err(|e| anyhow::anyhow!("cipher init: {}", e))?;
+    let plaintext = cipher
+        .decrypt(nonce, &payload[12..])
+        .map_err(|e| anyhow::anyhow!("decrypt: {}", e))?;
+    Ok(plaintext)
+}
+
+/// Wrap a CEK for a set of recipients using X25519 DH.
+/// The author (our_node_id) is always included.
+fn wrap_cek_for_recipients(
+    cek: &[u8; 32],
     our_seed: &[u8; 32],
     our_node_id: &NodeId,
     recipients: &[NodeId],
-) -> Result<(String, Vec<WrappedKey>)> {
-    // Generate random 32-byte Content Encryption Key
-    let mut cek = [0u8; 32];
-    rand::rng().fill_bytes(&mut cek);
-
-    // Encrypt content with CEK using ChaCha20-Poly1305
-    let content_cipher = ChaCha20Poly1305::new_from_slice(&cek)
-        .map_err(|e| anyhow::anyhow!("cipher init: {}", e))?;
-    let mut content_nonce_bytes = [0u8; 12];
-    rand::rng().fill_bytes(&mut content_nonce_bytes);
-    let content_nonce = Nonce::from_slice(&content_nonce_bytes);
-    let ciphertext = content_cipher
-        .encrypt(content_nonce, plaintext.as_bytes())
-        .map_err(|e| anyhow::anyhow!("encrypt: {}", e))?;
-
-    // base64(nonce || ciphertext_with_tag)
-    let mut payload = Vec::with_capacity(12 + ciphertext.len());
-    payload.extend_from_slice(&content_nonce_bytes);
-    payload.extend_from_slice(&ciphertext);
-    let encoded = base64::engine::general_purpose::STANDARD.encode(&payload);
-
-    // Get our X25519 private key
+) -> Result<Vec<WrappedKey>> {
     let our_x25519_private = ed25519_seed_to_x25519_private(our_seed);
 
     // Build recipient set (always include ourselves)
@@ -79,7 +94,6 @@ pub fn encrypt_post(
         all_recipients.push(*our_node_id);
     }
 
-    // Wrap CEK for each recipient
     let mut wrapped_keys = Vec::with_capacity(all_recipients.len());
     for recipient in &all_recipients {
         let their_x25519_pub = ed25519_pubkey_to_x25519_public(recipient)?;
@@ -106,20 +120,17 @@ pub fn encrypt_post(
         });
     }
 
-    Ok((encoded, wrapped_keys))
+    Ok(wrapped_keys)
 }
 
-/// Decrypt a post's content if we are among the recipients.
-///
-/// Returns `Ok(Some(plaintext))` if we can decrypt, `Ok(None)` if we're not a recipient.
-pub fn decrypt_post(
-    encrypted_content_b64: &str,
+/// Unwrap a CEK from wrapped keys if we are a recipient.
+/// Returns `Ok(Some(cek))` if we can unwrap, `Ok(None)` if we're not a recipient.
+pub fn unwrap_cek_for_recipient(
     our_seed: &[u8; 32],
     our_node_id: &NodeId,
     sender_pubkey: &NodeId,
     wrapped_keys: &[WrappedKey],
-) -> Result<Option<String>> {
-    // Find our wrapped key
+) -> Result<Option<[u8; 32]>> {
     let our_wk = match wrapped_keys.iter().find(|wk| &wk.recipient == our_node_id) {
         Some(wk) => wk,
         None => return Ok(None),
@@ -132,40 +143,142 @@ pub fn decrypt_post(
         );
     }
 
-    // DH with sender to get wrapping key
     let our_x25519_private = ed25519_seed_to_x25519_private(our_seed);
     let sender_x25519_pub = ed25519_pubkey_to_x25519_public(sender_pubkey)?;
     let shared_secret = x25519_dh(&our_x25519_private, &sender_x25519_pub);
     let wrapping_key = derive_wrapping_key(&shared_secret);
 
-    // Unwrap CEK
     let wrap_nonce = Nonce::from_slice(&our_wk.wrapped_cek[..12]);
     let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
         .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
-    let cek = wrap_cipher
+    let cek_vec = wrap_cipher
         .decrypt(wrap_nonce, &our_wk.wrapped_cek[12..])
         .map_err(|e| anyhow::anyhow!("unwrap CEK: {}", e))?;
 
-    if cek.len() != 32 {
-        bail!("unwrapped CEK wrong length: {}", cek.len());
+    if cek_vec.len() != 32 {
+        bail!("unwrapped CEK wrong length: {}", cek_vec.len());
     }
+    let mut cek = [0u8; 32];
+    cek.copy_from_slice(&cek_vec);
+    Ok(Some(cek))
+}
+
+/// Unwrap a group-encrypted CEK using the group seed and public key.
+pub fn unwrap_group_cek(
+    group_seed: &[u8; 32],
+    group_public_key: &[u8; 32],
+    wrapped_cek: &[u8],
+) -> Result<[u8; 32]> {
+    if wrapped_cek.len() != 60 {
+        bail!("invalid wrapped_cek length: expected 60, got {}", wrapped_cek.len());
+    }
+
+    let group_x25519_private = ed25519_seed_to_x25519_private(group_seed);
+    let group_x25519_public = ed25519_pubkey_to_x25519_public(group_public_key)?;
+    let shared_secret = x25519_dh(&group_x25519_private, &group_x25519_public);
+    let wrapping_key = derive_group_cek_wrapping_key(&shared_secret);
+
+    let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
+        .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
+    let wrap_nonce = Nonce::from_slice(&wrapped_cek[..12]);
+    let cek_vec = wrap_cipher
+        .decrypt(wrap_nonce, &wrapped_cek[12..])
+        .map_err(|e| anyhow::anyhow!("unwrap CEK: {}", e))?;
+
+    if cek_vec.len() != 32 {
+        bail!("unwrapped CEK wrong length: {}", cek_vec.len());
+    }
+    let mut cek = [0u8; 32];
+    cek.copy_from_slice(&cek_vec);
+    Ok(cek)
+}
+
+/// Encrypt a post with a provided CEK, wrapping for recipients.
+/// Returns `(base64_ciphertext, Vec<WrappedKey>)`.
+pub fn encrypt_post_with_cek(
+    plaintext: &str,
+    cek: &[u8; 32],
+    our_seed: &[u8; 32],
+    our_node_id: &NodeId,
+    recipients: &[NodeId],
+) -> Result<(String, Vec<WrappedKey>)> {
+    let payload = encrypt_bytes_with_cek(plaintext.as_bytes(), cek)?;
+    let encoded = base64::engine::general_purpose::STANDARD.encode(&payload);
+    let wrapped_keys = wrap_cek_for_recipients(cek, our_seed, our_node_id, recipients)?;
+    Ok((encoded, wrapped_keys))
+}
+
+/// Encrypt a post for a group with a provided CEK.
+/// Returns `(base64_ciphertext, wrapped_cek_bytes)`.
+pub fn encrypt_post_for_group_with_cek(
+    plaintext: &str,
+    cek: &[u8; 32],
+    group_seed: &[u8; 32],
+    group_public_key: &[u8; 32],
+) -> Result<(String, Vec<u8>)> {
+    let payload = encrypt_bytes_with_cek(plaintext.as_bytes(), cek)?;
+    let encoded = base64::engine::general_purpose::STANDARD.encode(&payload);
+
+    // Wrap CEK using group DH
+    let group_x25519_private = ed25519_seed_to_x25519_private(group_seed);
+    let group_x25519_public = ed25519_pubkey_to_x25519_public(group_public_key)?;
+    let shared_secret = x25519_dh(&group_x25519_private, &group_x25519_public);
+    let wrapping_key = derive_group_cek_wrapping_key(&shared_secret);
+
+    let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
+        .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
+    let mut wrap_nonce_bytes = [0u8; 12];
+    rand::rng().fill_bytes(&mut wrap_nonce_bytes);
+    let wrap_nonce = Nonce::from_slice(&wrap_nonce_bytes);
+    let wrapped = wrap_cipher
+        .encrypt(wrap_nonce, cek.as_slice())
+        .map_err(|e| anyhow::anyhow!("wrap CEK: {}", e))?;
+
+    let mut wrapped_cek = Vec::with_capacity(60);
+    wrapped_cek.extend_from_slice(&wrap_nonce_bytes);
+    wrapped_cek.extend_from_slice(&wrapped);
+
+    Ok((encoded, wrapped_cek))
+}
+
+/// Encrypt a post's plaintext content for the given recipients.
+///
+/// Returns `(base64_ciphertext, Vec<WrappedKey>)` where:
+/// - base64_ciphertext is `base64(nonce(12) || ciphertext || tag(16))` for the content
+/// - Each WrappedKey contains the CEK encrypted for one recipient
+///
+/// The author (our_seed's corresponding NodeId) is always included as a recipient.
+pub fn encrypt_post(
+    plaintext: &str,
+    our_seed: &[u8; 32],
+    our_node_id: &NodeId,
+    recipients: &[NodeId],
+) -> Result<(String, Vec<WrappedKey>)> {
+    let cek = random_cek();
+    encrypt_post_with_cek(plaintext, &cek, our_seed, our_node_id, recipients)
+}
+
+/// Decrypt a post's content if we are among the recipients.
+///
+/// Returns `Ok(Some(plaintext))` if we can decrypt, `Ok(None)` if we're not a recipient.
+pub fn decrypt_post(
+    encrypted_content_b64: &str,
+    our_seed: &[u8; 32],
+    our_node_id: &NodeId,
+    sender_pubkey: &NodeId,
+    wrapped_keys: &[WrappedKey],
+) -> Result<Option<String>> {
+    let cek = match unwrap_cek_for_recipient(our_seed, our_node_id, sender_pubkey, wrapped_keys)? {
+        Some(cek) => cek,
+        None => return Ok(None),
+    };
 
     // Decode base64 content
     let payload = base64::engine::general_purpose::STANDARD
         .decode(encrypted_content_b64)
         .map_err(|e| anyhow::anyhow!("base64 decode: {}", e))?;
-    if payload.len() < 12 + 16 {
-        bail!("encrypted payload too short");
-    }
-
-    // Decrypt content
-    let content_nonce = Nonce::from_slice(&payload[..12]);
-    let content_cipher = ChaCha20Poly1305::new_from_slice(&cek)
-        .map_err(|e| anyhow::anyhow!("content cipher init: {}", e))?;
-    let plaintext = content_cipher
-        .decrypt(content_nonce, &payload[12..])
-        .map_err(|e| anyhow::anyhow!("decrypt content: {}", e))?;
 
+    let plaintext = decrypt_bytes_with_cek(&payload, &cek)?;
     Ok(Some(String::from_utf8(plaintext)?))
 }
 
@@ -202,63 +315,12 @@ pub fn rewrap_visibility(
     existing_recipients: &[WrappedKey],
     new_recipient_ids: &[NodeId],
 ) -> Result<Vec<WrappedKey>> {
-    // Find our wrapped key
-    let our_wk = existing_recipients
-        .iter()
-        .find(|wk| &wk.recipient == our_node_id)
+    // Unwrap CEK using DH with ourselves (we are both sender and recipient here)
+    let cek = unwrap_cek_for_recipient(our_seed, our_node_id, our_node_id, existing_recipients)?
         .ok_or_else(|| anyhow::anyhow!("we are not a recipient of this post"))?;
 
-    if our_wk.wrapped_cek.len() != 60 {
-        bail!(
-            "invalid wrapped_cek length: expected 60, got {}",
-            our_wk.wrapped_cek.len()
-        );
-    }
-
-    // DH with ourselves (author DH with self) to unwrap CEK
-    let our_x25519_private = ed25519_seed_to_x25519_private(our_seed);
-    let our_x25519_pub = ed25519_pubkey_to_x25519_public(our_node_id)?;
-    let shared_secret = x25519_dh(&our_x25519_private, &our_x25519_pub);
-    let wrapping_key = derive_wrapping_key(&shared_secret);
-
-    let wrap_nonce = Nonce::from_slice(&our_wk.wrapped_cek[..12]);
-    let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
-        .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
-    let cek = wrap_cipher
-        .decrypt(wrap_nonce, &our_wk.wrapped_cek[12..])
-        .map_err(|e| anyhow::anyhow!("unwrap CEK: {}", e))?;
-
-    if cek.len() != 32 {
-        bail!("unwrapped CEK wrong length: {}", cek.len());
-    }
-
-    // Re-wrap for each new recipient
-    let mut wrapped_keys = Vec::with_capacity(new_recipient_ids.len());
-    for recipient in new_recipient_ids {
-        let their_x25519_pub = ed25519_pubkey_to_x25519_public(recipient)?;
-        let shared_secret = x25519_dh(&our_x25519_private, &their_x25519_pub);
-        let wrapping_key = derive_wrapping_key(&shared_secret);
-
-        let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
-            .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
-        let mut wrap_nonce_bytes = [0u8; 12];
-        rand::rng().fill_bytes(&mut wrap_nonce_bytes);
-        let wrap_nonce = Nonce::from_slice(&wrap_nonce_bytes);
-        let wrapped = wrap_cipher
-            .encrypt(wrap_nonce, cek.as_slice())
-            .map_err(|e| anyhow::anyhow!("wrap: {}", e))?;
-
-        let mut wrapped_cek = Vec::with_capacity(60);
-        wrapped_cek.extend_from_slice(&wrap_nonce_bytes);
-        wrapped_cek.extend_from_slice(&wrapped);
-
-        wrapped_keys.push(WrappedKey {
-            recipient: *recipient,
-            wrapped_cek,
-        });
-    }
-
-    Ok(wrapped_keys)
+    // Re-wrap for each new recipient (don't auto-add ourselves — caller controls the list)
+    wrap_cek_for_recipients(&cek, our_seed, our_node_id, new_recipient_ids)
 }
 
 // --- Group Key Encryption ---
@@ -352,45 +414,8 @@ pub fn encrypt_post_for_group(
     group_seed: &[u8; 32],
     group_public_key: &[u8; 32],
 ) -> Result<(String, Vec<u8>)> {
-    // Generate random CEK
-    let mut cek = [0u8; 32];
-    rand::rng().fill_bytes(&mut cek);
-
-    // Encrypt content with CEK
-    let content_cipher = ChaCha20Poly1305::new_from_slice(&cek)
-        .map_err(|e| anyhow::anyhow!("cipher init: {}", e))?;
-    let mut content_nonce_bytes = [0u8; 12];
-    rand::rng().fill_bytes(&mut content_nonce_bytes);
-    let content_nonce = Nonce::from_slice(&content_nonce_bytes);
-    let ciphertext = content_cipher
-        .encrypt(content_nonce, plaintext.as_bytes())
-        .map_err(|e| anyhow::anyhow!("encrypt: {}", e))?;
-
-    let mut payload = Vec::with_capacity(12 + ciphertext.len());
-    payload.extend_from_slice(&content_nonce_bytes);
-    payload.extend_from_slice(&ciphertext);
-    let encoded = base64::engine::general_purpose::STANDARD.encode(&payload);
-
-    // Wrap CEK using group DH: group_seed (as X25519 private) × group_public_key (as X25519 public)
-    let group_x25519_private = ed25519_seed_to_x25519_private(group_seed);
-    let group_x25519_public = ed25519_pubkey_to_x25519_public(group_public_key)?;
-    let shared_secret = x25519_dh(&group_x25519_private, &group_x25519_public);
-    let wrapping_key = derive_group_cek_wrapping_key(&shared_secret);
-
-    let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
-        .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
-    let mut wrap_nonce_bytes = [0u8; 12];
-    rand::rng().fill_bytes(&mut wrap_nonce_bytes);
-    let wrap_nonce = Nonce::from_slice(&wrap_nonce_bytes);
-    let wrapped = wrap_cipher
-        .encrypt(wrap_nonce, cek.as_slice())
-        .map_err(|e| anyhow::anyhow!("wrap CEK: {}", e))?;
-
-    let mut wrapped_cek = Vec::with_capacity(60);
-    wrapped_cek.extend_from_slice(&wrap_nonce_bytes);
-    wrapped_cek.extend_from_slice(&wrapped);
-
-    Ok((encoded, wrapped_cek))
+    let cek = random_cek();
+    encrypt_post_for_group_with_cek(plaintext, &cek, group_seed, group_public_key)
 }
 
 /// Decrypt a group-encrypted post using the group seed and public key.
@@ -400,42 +425,14 @@ pub fn decrypt_group_post(
     group_public_key: &[u8; 32],
     wrapped_cek: &[u8],
 ) -> Result<String> {
-    if wrapped_cek.len() != 60 {
-        bail!("invalid wrapped_cek length: expected 60, got {}", wrapped_cek.len());
-    }
-
-    // Unwrap CEK using group DH
-    let group_x25519_private = ed25519_seed_to_x25519_private(group_seed);
-    let group_x25519_public = ed25519_pubkey_to_x25519_public(group_public_key)?;
-    let shared_secret = x25519_dh(&group_x25519_private, &group_x25519_public);
-    let wrapping_key = derive_group_cek_wrapping_key(&shared_secret);
-
-    let wrap_cipher = ChaCha20Poly1305::new_from_slice(&wrapping_key)
-        .map_err(|e| anyhow::anyhow!("wrap cipher init: {}", e))?;
-    let wrap_nonce = Nonce::from_slice(&wrapped_cek[..12]);
-    let cek = wrap_cipher
-        .decrypt(wrap_nonce, &wrapped_cek[12..])
-        .map_err(|e| anyhow::anyhow!("unwrap CEK: {}", e))?;
-
-    if cek.len() != 32 {
-        bail!("unwrapped CEK wrong length: {}", cek.len());
-    }
+    let cek = unwrap_group_cek(group_seed, group_public_key, wrapped_cek)?;
 
     // Decode and decrypt content
     let payload = base64::engine::general_purpose::STANDARD
         .decode(encrypted_b64)
         .map_err(|e| anyhow::anyhow!("base64 decode: {}", e))?;
-    if payload.len() < 12 + 16 {
-        bail!("encrypted payload too short");
-    }
-
-    let content_nonce = Nonce::from_slice(&payload[..12]);
-    let content_cipher = ChaCha20Poly1305::new_from_slice(&cek)
-        .map_err(|e| anyhow::anyhow!("content cipher init: {}", e))?;
-    let plaintext = content_cipher
-        .decrypt(content_nonce, &payload[12..])
-        .map_err(|e| anyhow::anyhow!("decrypt content: {}", e))?;
 
+    let plaintext = decrypt_bytes_with_cek(&payload, &cek)?;
     Ok(String::from_utf8(plaintext)?)
 }
 

crates/core/src/node.rs

@@ -522,24 +522,20 @@ impl Node {
             }
         }
 
-        // Store blob files and build attachment metadata (DB records deferred until post_id known)
-        let mut attachments = Vec::with_capacity(attachment_data.len());
-        for (data, mime) in &attachment_data {
-            let cid = crate::blob::compute_blob_id(data);
-            self.blob_store.store(&cid, data)?;
-            attachments.push(Attachment {
-                cid,
-                mime_type: mime.clone(),
-                size_bytes: data.len() as u64,
-            });
-        }
-
         let now = std::time::SystemTime::now()
             .duration_since(std::time::UNIX_EPOCH)?
             .as_millis() as u64;
 
-        let (final_content, visibility) = match &intent {
-            VisibilityIntent::Public => (content, PostVisibility::Public),
+        // Determine encryption parameters and generate CEK if needed.
+        // The CEK is generated BEFORE both content and blob encryption so they share the same key.
+        enum EncryptionMode {
+            Public,
+            Recipient { cek: [u8; 32], recipients: Vec<NodeId> },
+            Group { cek: [u8; 32], group_id: [u8; 32], epoch: u64, group_seed: [u8; 32], group_pubkey: [u8; 32] },
+        }
+
+        let mode = match &intent {
+            VisibilityIntent::Public => EncryptionMode::Public,
             VisibilityIntent::Circle(circle_name) => {
                 // Try group encryption first
                 let group_info = {
@@ -551,30 +547,17 @@ impl Node {
                         })
                 };
                 if let Some((group_id, epoch, group_seed, group_pubkey)) = group_info {
-                    let (encrypted, wrapped_cek) =
-                        crypto::encrypt_post_for_group(&content, &group_seed, &group_pubkey)?;
-                    (
-                        encrypted,
-                        PostVisibility::GroupEncrypted {
-                            group_id,
-                            epoch,
-                            wrapped_cek,
-                        },
-                    )
+                    let mut cek = [0u8; 32];
+                    rand::RngCore::fill_bytes(&mut rand::rng(), &mut cek);
+                    EncryptionMode::Group { cek, group_id, epoch, group_seed, group_pubkey }
                 } else {
-                    // Fallback to per-recipient encryption
                     let recipients = self.resolve_recipients(&intent).await?;
                     if recipients.is_empty() {
                         anyhow::bail!("no recipients resolved for this visibility");
                     }
-                    let (encrypted, wrapped_keys) =
-                        crypto::encrypt_post(&content, &self.secret_seed, &self.node_id, &recipients)?;
-                    (
-                        encrypted,
-                        PostVisibility::Encrypted {
-                            recipients: wrapped_keys,
-                        },
-                    )
+                    let mut cek = [0u8; 32];
+                    rand::RngCore::fill_bytes(&mut rand::rng(), &mut cek);
+                    EncryptionMode::Recipient { cek, recipients }
                 }
             }
             _ => {
@@ -582,8 +565,41 @@ impl Node {
                 if recipients.is_empty() {
                     anyhow::bail!("no recipients resolved for this visibility");
                 }
+                let mut cek = [0u8; 32];
+                rand::RngCore::fill_bytes(&mut rand::rng(), &mut cek);
+                EncryptionMode::Recipient { cek, recipients }
+            }
+        };
+
+        // Store blob files — for encrypted posts, encrypt each blob with the shared CEK.
+        // CID is computed on the ciphertext so peers can verify what they store.
+        let mut attachments = Vec::with_capacity(attachment_data.len());
+        for (data, mime) in &attachment_data {
+            let (store_data, size) = match &mode {
+                EncryptionMode::Public => {
+                    (data.clone(), data.len() as u64)
+                }
+                EncryptionMode::Recipient { cek, .. } | EncryptionMode::Group { cek, .. } => {
+                    let encrypted = crypto::encrypt_bytes_with_cek(data, cek)?;
+                    let sz = encrypted.len() as u64;
+                    (encrypted, sz)
+                }
+            };
+            let cid = crate::blob::compute_blob_id(&store_data);
+            self.blob_store.store(&cid, &store_data)?;
+            attachments.push(Attachment {
+                cid,
+                mime_type: mime.clone(),
+                size_bytes: size,
+            });
+        }
+
+        // Encrypt content and build visibility
+        let (final_content, visibility) = match mode {
+            EncryptionMode::Public => (content, PostVisibility::Public),
+            EncryptionMode::Recipient { cek, recipients } => {
                 let (encrypted, wrapped_keys) =
-                    crypto::encrypt_post(&content, &self.secret_seed, &self.node_id, &recipients)?;
+                    crypto::encrypt_post_with_cek(&content, &cek, &self.secret_seed, &self.node_id, &recipients)?;
                 (
                     encrypted,
                     PostVisibility::Encrypted {
@@ -591,6 +607,18 @@ impl Node {
                     },
                 )
             }
+            EncryptionMode::Group { cek, group_id, epoch, group_seed, group_pubkey } => {
+                let (encrypted, wrapped_cek) =
+                    crypto::encrypt_post_for_group_with_cek(&content, &cek, &group_seed, &group_pubkey)?;
+                (
+                    encrypted,
+                    PostVisibility::GroupEncrypted {
+                        group_id,
+                        epoch,
+                        wrapped_cek,
+                    },
+                )
+            }
         };
 
         let post = Post {
@@ -969,6 +997,136 @@ impl Node {
         Ok(data)
     }
 
+    /// Decrypt a blob in the context of a post's visibility.
+    /// Public posts pass through unchanged. Encrypted/group-encrypted posts decrypt with the CEK.
+    fn decrypt_blob_for_post(
+        &self,
+        data: Vec<u8>,
+        post: &Post,
+        visibility: &PostVisibility,
+        group_seeds: &std::collections::HashMap<([u8; 32], u64), ([u8; 32], [u8; 32])>,
+    ) -> anyhow::Result<Option<Vec<u8>>> {
+        match visibility {
+            PostVisibility::Public => Ok(Some(data)),
+            PostVisibility::Encrypted { recipients } => {
+                let cek = crypto::unwrap_cek_for_recipient(
+                    &self.secret_seed,
+                    &self.node_id,
+                    &post.author,
+                    recipients,
+                )?;
+                match cek {
+                    Some(cek) => {
+                        let plaintext = crypto::decrypt_bytes_with_cek(&data, &cek)?;
+                        Ok(Some(plaintext))
+                    }
+                    None => Ok(None),
+                }
+            }
+            PostVisibility::GroupEncrypted { group_id, epoch, wrapped_cek } => {
+                if let Some((seed, pubkey)) = group_seeds.get(&(*group_id, *epoch)) {
+                    let cek = crypto::unwrap_group_cek(seed, pubkey, wrapped_cek)?;
+                    let plaintext = crypto::decrypt_bytes_with_cek(&data, &cek)?;
+                    Ok(Some(plaintext))
+                } else {
+                    Ok(None)
+                }
+            }
+        }
+    }
+
+    /// Get a blob by CID, decrypting it in the context of the given post.
+    /// For public posts, returns raw blob data. For encrypted posts, decrypts with the post's CEK.
+    pub async fn get_blob_for_post(
+        &self,
+        cid: &[u8; 32],
+        post_id: &PostId,
+    ) -> anyhow::Result<Option<Vec<u8>>> {
+        // Get raw blob data (local)
+        let raw_data = match self.blob_store.get(cid)? {
+            Some(d) => d,
+            None => return Ok(None),
+        };
+        {
+            let storage = self.storage.lock().await;
+            let _ = storage.touch_blob_access(cid);
+        }
+
+        // Get post + visibility
+        let (post, visibility) = {
+            let storage = self.storage.lock().await;
+            match storage.get_post_with_visibility(post_id)? {
+                Some(pv) => pv,
+                None => return Ok(Some(raw_data)), // No post context — return raw
+            }
+        };
+
+        match &visibility {
+            PostVisibility::Public => Ok(Some(raw_data)),
+            PostVisibility::Encrypted { .. } => {
+                let empty_map = std::collections::HashMap::new();
+                self.decrypt_blob_for_post(raw_data, &post, &visibility, &empty_map)
+            }
+            PostVisibility::GroupEncrypted { .. } => {
+                let group_seeds = {
+                    let storage = self.storage.lock().await;
+                    storage.get_all_group_seeds_map().unwrap_or_default()
+                };
+                self.decrypt_blob_for_post(raw_data, &post, &visibility, &group_seeds)
+            }
+        }
+    }
+
+    /// Prefetch blobs for recently synced posts from a peer.
+    /// Queries storage for posts with attachments missing from the local blob store,
+    /// then fetches each missing blob. Runs outside any locks.
+    pub async fn prefetch_blobs_from_peer(&self, peer_id: &NodeId) {
+        // Gather posts with missing blobs
+        let missing: Vec<(PostId, NodeId, Vec<crate::types::Attachment>)> = {
+            let storage = self.storage.lock().await;
+            let post_ids = storage.list_post_ids().unwrap_or_default();
+            let mut result = Vec::new();
+            for pid in post_ids {
+                if let Ok(Some(post)) = storage.get_post(&pid) {
+                    let missing_atts: Vec<_> = post.attachments.iter()
+                        .filter(|a| !self.blob_store.has(&a.cid))
+                        .cloned()
+                        .collect();
+                    if !missing_atts.is_empty() {
+                        result.push((pid, post.author, missing_atts));
+                    }
+                }
+            }
+            result
+        };
+
+        if missing.is_empty() {
+            return;
+        }
+
+        let mut fetched = 0usize;
+        for (post_id, author, attachments) in &missing {
+            for att in attachments {
+                match self.fetch_blob_with_fallback(
+                    &att.cid, post_id, author, &att.mime_type, 0,
+                ).await {
+                    Ok(Some(_)) => { fetched += 1; }
+                    Ok(None) => {}
+                    Err(e) => {
+                        tracing::debug!(
+                            cid = hex::encode(att.cid),
+                            error = %e,
+                            "Blob prefetch failed"
+                        );
+                    }
+                }
+            }
+        }
+        if fetched > 0 {
+            tracing::info!(fetched, peer = hex::encode(peer_id), "Prefetched blobs after sync");
+        }
+    }
+
     /// Check if a blob exists locally.
     pub fn has_blob(&self, cid: &[u8; 32]) -> bool {
         self.blob_store.has(cid)
@@ -2049,6 +2207,10 @@ impl Node {
             engagement_headers = engagement,
             "Sync complete"
         );
+        // Prefetch blobs for posts we just received
+        if stats.posts_received > 0 {
+            self.prefetch_blobs_from_peer(&peer_id).await;
+        }
         Ok(())
     }
 
@@ -2115,15 +2277,15 @@ impl Node {
         tokio::spawn(async move { network.run_accept_loop().await })
     }
 
-    /// Start pull cycle: every interval_secs, pull from connected peers.
-    pub fn start_pull_cycle(&self, interval_secs: u64) -> tokio::task::JoinHandle<()> {
-        let network = Arc::clone(&self.network);
+    /// Start pull cycle: every interval_secs, pull from connected peers + prefetch blobs.
+    pub fn start_pull_cycle(self: &Arc<Self>, interval_secs: u64) -> tokio::task::JoinHandle<()> {
+        let node = Arc::clone(self);
         tokio::spawn(async move {
             let mut interval =
                 tokio::time::interval(std::time::Duration::from_secs(interval_secs));
             loop {
                 interval.tick().await;
-                match network.pull_from_all().await {
+                match node.network.pull_from_all().await {
                     Ok(stats) => {
                         if stats.posts_received > 0 {
                             tracing::debug!(
@@ -2131,6 +2293,11 @@ impl Node {
                                 peers = stats.peers_pulled,
                                 "Pull cycle complete"
                             );
+                            // Prefetch blobs for newly received posts
+                            let peers = node.network.conn_handle().connected_peers().await;
+                            for peer_id in peers {
+                                node.prefetch_blobs_from_peer(&peer_id).await;
+                            }
                         }
                     }
                     Err(e) => {

crates/core/src/storage.rs

@@ -644,6 +644,23 @@ impl Storage {
         }
     }
 
+    /// Get the visibility intent for a post (if stored).
+    pub fn get_post_intent(&self, id: &PostId) -> anyhow::Result<Option<VisibilityIntent>> {
+        let mut stmt = self.conn.prepare(
+            "SELECT visibility_intent FROM posts WHERE id = ?1",
+        )?;
+        let mut rows = stmt.query(params![id.as_slice()])?;
+        if let Some(row) = rows.next()? {
+            let intent_json: Option<String> = row.get(0)?;
+            match intent_json {
+                Some(json) => Ok(serde_json::from_str(&json).ok()),
+                None => Ok(None),
+            }
+        } else {
+            Ok(None)
+        }
+    }
+
     pub fn list_post_ids(&self) -> anyhow::Result<Vec<PostId>> {
         let mut stmt = self.conn.prepare("SELECT id FROM posts")?;
         let rows = stmt.query_map([], |row| {

crates/tauri-app/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "itsgoin-desktop"
-version = "0.3.4"
+version = "0.3.5"
 edition = "2021"
 
 [lib]

crates/tauri-app/src/lib.rs

@@ -30,6 +30,8 @@ struct PostDto {
     is_me: bool,
     /// "public", "encrypted", or "encrypted-for-me"
     visibility: String,
+    /// The original intent: "public", "friends", "circle", "direct", or "unknown"
+    intent_kind: String,
     /// Decrypted plaintext if we can decrypt; None for public or if we're not a recipient
     decrypted_content: Option<String>,
     attachments: Vec<AttachmentDto>,
@@ -158,13 +160,32 @@ async fn post_to_dto(
     decrypted: Option<&str>,
     node: &Node,
 ) -> PostDto {
+    let is_me = &post.author == &node.node_id;
     let author_name = match node.resolve_display_name(&post.author).await {
         Ok((name, _, _)) if !name.is_empty() => Some(name),
         _ => None,
     };
+
+    // Resolve intent kind from storage
+    let intent_kind = {
+        let storage = node.storage.lock().await;
+        match storage.get_post_intent(id) {
+            Ok(Some(intent)) => match intent {
+                VisibilityIntent::Public => "public".to_string(),
+                VisibilityIntent::Friends => "friends".to_string(),
+                VisibilityIntent::Circle(_) => "circle".to_string(),
+                VisibilityIntent::Direct(_) => "direct".to_string(),
+            },
+            _ => "unknown".to_string(),
+        }
+    };
+
+    // For own encrypted posts, show "encrypted" not "encrypted-for-me"
+    // since intent_kind handles DM filtering now
     let (visibility, decrypted_content) = match vis {
         PostVisibility::Public => ("public".to_string(), None),
         PostVisibility::Encrypted { .. } | PostVisibility::GroupEncrypted { .. } => match decrypted {
+            Some(text) if is_me => ("encrypted".to_string(), Some(text.to_string())),
             Some(text) => ("encrypted-for-me".to_string(), Some(text.to_string())),
             None => ("encrypted".to_string(), None),
         },
@@ -203,8 +224,9 @@ async fn post_to_dto(
         author_name,
         content: post.content.clone(),
         timestamp_ms: post.timestamp_ms,
-        is_me: &post.author == &node.node_id,
+        is_me,
         visibility,
+        intent_kind,
         decrypted_content,
         attachments,
         recipients,
@@ -394,16 +416,95 @@ async fn create_post_with_files(
 }
 
 /// Return the filesystem path of a blob if it exists locally (for streaming video/media).
+/// For non-public (encrypted) posts, returns None since raw encrypted blobs can't be served
+/// via the asset protocol — the frontend must use IPC-based get_blob instead.
 #[tauri::command]
 async fn get_blob_path(
     state: State<'_, AppState>,
     cid_hex: String,
+    post_id_hex: Option<String>,
 ) -> Result<Option<String>, String> {
+    let node = state.inner();
     let cid_bytes = hex::decode(&cid_hex).map_err(|e| e.to_string())?;
     let cid: [u8; 32] = cid_bytes
         .try_into()
         .map_err(|_| "CID must be 32 bytes".to_string())?;
-    Ok(state.blob_store.file_path(&cid).map(|p| p.to_string_lossy().to_string()))
+
+    // If a post_id is provided, check if the post is encrypted — if so, can't serve raw file
+    if let Some(ref pid_hex) = post_id_hex {
+        if let Ok(pid_bytes) = hex::decode(pid_hex) {
+            if let Ok(post_id) = <[u8; 32]>::try_from(pid_bytes.as_slice()) {
+                let storage = node.storage.lock().await;
+                if let Ok(Some((_post, vis))) = storage.get_post_with_visibility(&post_id) {
+                    if !matches!(vis, PostVisibility::Public) {
+                        return Ok(None);
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(node.blob_store.file_path(&cid).map(|p| p.to_string_lossy().to_string()))
+}
+
+/// Sanitize a filename for safe download: strip path separators and control characters.
+fn sanitize_download_filename(filename: &str) -> String {
+    filename
+        .replace(['/', '\\', '\0'], "_")
+        .chars()
+        .filter(|c| !c.is_control())
+        .collect::<String>()
+}
+
+/// Helper: resolve a blob with optional decryption via post context.
+/// First tries local (with post-based decryption), then falls back to network fetch + decrypt.
+async fn resolve_blob_data(
+    node: &Node,
+    cid: &[u8; 32],
+    post_id_hex: Option<&str>,
+) -> Result<Vec<u8>, String> {
+    // Parse post_id if provided
+    let post_id = if let Some(pid_hex) = post_id_hex {
+        let pid_bytes = hex::decode(pid_hex).map_err(|e| e.to_string())?;
+        Some(<[u8; 32]>::try_from(pid_bytes.as_slice()).map_err(|_| "bad post_id".to_string())?)
+    } else {
+        None
+    };
+
+    // Try local blob with decryption
+    if let Some(ref pid) = post_id {
+        if let Some(data) = node.get_blob_for_post(cid, pid).await.map_err(|e| e.to_string())? {
+            return Ok(data);
+        }
+    } else if let Some(data) = node.get_blob(cid).await.map_err(|e| e.to_string())? {
+        return Ok(data);
+    }
+
+    // Try fetching from network if post_id provided
+    if let Some(pid) = post_id {
+        let post = {
+            let storage = node.storage.lock().await;
+            storage.get_post(&pid).map_err(|e| e.to_string())?
+        };
+        if let Some(post) = post {
+            let mime = post.attachments.iter()
+                .find(|a| a.cid == *cid)
+                .map(|a| a.mime_type.as_str())
+                .unwrap_or("application/octet-stream");
+            if let Some(_fetched) = node
+                .fetch_blob_with_fallback(cid, &pid, &post.author, mime, post.timestamp_ms)
+                .await
+                .map_err(|e| e.to_string())?
+            {
+                // Re-read with decryption
+                if let Some(data) = node.get_blob_for_post(cid, &pid).await.map_err(|e| e.to_string())? {
+                    return Ok(data);
+                }
+            }
+        }
+    }
+
+    Err("blob not found".to_string())
 }
 
 /// Save a blob to the Downloads folder and open it with the system handler.
@@ -420,36 +521,14 @@ async fn save_and_open_blob(
         .try_into()
         .map_err(|_| "CID must be 32 bytes".to_string())?;
 
-    // Get blob data (local or fetch from network)
-    let data = if let Some(d) = node.get_blob(&cid).await.map_err(|e| e.to_string())? {
-        d
-    } else if let Some(pid_hex) = post_id_hex {
-        let pid_bytes = hex::decode(&pid_hex).map_err(|e| e.to_string())?;
-        let post_id: [u8; 32] = pid_bytes.try_into().map_err(|_| "bad post_id".to_string())?;
-        let post = {
-            let storage = node.storage.lock().await;
-            storage.get_post(&post_id).map_err(|e| e.to_string())?
-        };
-        if let Some(post) = post {
-            let mime = post.attachments.iter()
-                .find(|a| a.cid == cid)
-                .map(|a| a.mime_type.as_str())
-                .unwrap_or("application/octet-stream");
-            node.fetch_blob_with_fallback(&cid, &post_id, &post.author, mime, post.timestamp_ms)
-                .await.map_err(|e| e.to_string())?
-                .ok_or_else(|| "blob not found".to_string())?
-        } else {
-            return Err("post not found".to_string());
-        }
-    } else {
-        return Err("blob not found".to_string());
-    };
+    let data = resolve_blob_data(node, &cid, post_id_hex.as_deref()).await?;
+    let safe_name = sanitize_download_filename(&filename);
 
     // Save to Downloads
     let downloads = dirs::download_dir()
         .or_else(|| dirs::home_dir().map(|h| h.join("Downloads")))
         .unwrap_or_else(|| std::path::PathBuf::from("/tmp"));
-    let dest = downloads.join(&filename);
+    let dest = downloads.join(&safe_name);
     tokio::fs::write(&dest, &data).await.map_err(|e| e.to_string())?;
 
     // Open with system handler
@@ -472,34 +551,13 @@ async fn save_blob(
         .try_into()
         .map_err(|_| "CID must be 32 bytes".to_string())?;
 
-    let data = if let Some(d) = node.get_blob(&cid).await.map_err(|e| e.to_string())? {
-        d
-    } else if let Some(pid_hex) = post_id_hex {
-        let pid_bytes = hex::decode(&pid_hex).map_err(|e| e.to_string())?;
-        let post_id: [u8; 32] = pid_bytes.try_into().map_err(|_| "bad post_id".to_string())?;
-        let post = {
-            let storage = node.storage.lock().await;
-            storage.get_post(&post_id).map_err(|e| e.to_string())?
-        };
-        if let Some(post) = post {
-            let mime = post.attachments.iter()
-                .find(|a| a.cid == cid)
-                .map(|a| a.mime_type.as_str())
-                .unwrap_or("application/octet-stream");
-            node.fetch_blob_with_fallback(&cid, &post_id, &post.author, mime, post.timestamp_ms)
-                .await.map_err(|e| e.to_string())?
-                .ok_or_else(|| "blob not found".to_string())?
-        } else {
-            return Err("post not found".to_string());
-        }
-    } else {
-        return Err("blob not found".to_string());
-    };
+    let data = resolve_blob_data(node, &cid, post_id_hex.as_deref()).await?;
+    let safe_name = sanitize_download_filename(&filename);
 
     let downloads = dirs::download_dir()
         .or_else(|| dirs::home_dir().map(|h| h.join("Downloads")))
         .unwrap_or_else(|| std::path::PathBuf::from("/tmp"));
-    let dest = downloads.join(&filename);
+    let dest = downloads.join(&safe_name);
     tokio::fs::write(&dest, &data).await.map_err(|e| e.to_string())?;
 
     Ok(dest.to_string_lossy().to_string())
@@ -517,41 +575,9 @@ async fn get_blob(
         .try_into()
         .map_err(|_| "CID must be 32 bytes".to_string())?;
 
-    // Check local first (also touches last_accessed_at)
-    if let Some(data) = node.get_blob(&cid).await.map_err(|e| e.to_string())? {
+    let data = resolve_blob_data(node, &cid, post_id_hex.as_deref()).await?;
     use base64::Engine;
-        return Ok(base64::engine::general_purpose::STANDARD.encode(&data));
-    }
-
-    // Try fetching from author → replica peers if post_id provided
-    if let Some(pid_hex) = post_id_hex {
-        let pid_bytes = hex::decode(&pid_hex).map_err(|e| e.to_string())?;
-        let post_id: [u8; 32] = pid_bytes
-            .try_into()
-            .map_err(|_| "post_id must be 32 bytes".to_string())?;
-        let post = {
-            let storage = node.storage.lock().await;
-            storage.get_post(&post_id).map_err(|e| e.to_string())?
-        };
-        if let Some(post) = post {
-            // Find the mime type from the post's attachments
-            let mime_type = post.attachments.iter()
-                .find(|a| a.cid == cid)
-                .map(|a| a.mime_type.as_str())
-                .unwrap_or("application/octet-stream");
-
-            if let Some(data) = node
-                .fetch_blob_with_fallback(&cid, &post_id, &post.author, mime_type, post.timestamp_ms)
-                .await
-                .map_err(|e| e.to_string())?
-            {
-                use base64::Engine;
-                return Ok(base64::engine::general_purpose::STANDARD.encode(&data));
-            }
-        }
-    }
-
-    Err("blob not found".to_string())
+    Ok(base64::engine::general_purpose::STANDARD.encode(&data))
 }
 
 #[tauri::command]

crates/tauri-app/tauri.conf.json

@@ -1,6 +1,6 @@
 {
   "productName": "itsgoin",
-  "version": "0.3.4",
+  "version": "0.3.5",
   "identifier": "com.itsgoin.app",
   "build": {
     "frontendDist": "../../frontend",

frontend/app.js

@@ -628,7 +628,7 @@ async function loadStats() {
 async function loadFeed(force) {
     try {
         const allPosts = await invoke('get_feed');
-        const posts = allPosts.filter(p => p.visibility !== 'encrypted-for-me');
+        const posts = allPosts.filter(p => p.intentKind !== 'direct');
         // Fingerprint: post IDs + reaction counts + comment counts
         const fp = posts.map(p => `${p.id}:${(p.reactionCounts||[]).map(r=>r.emoji+r.count).join(',')}:${p.commentCount||0}`).join('|');
         if (!force && fp === _feedFingerprint) return;
@@ -705,7 +705,7 @@ async function loadFeed(force) {
 async function loadMyPosts(force) {
     try {
         const posts = await invoke('get_all_posts');
-        const mine = posts.filter(p => p.isMe && p.visibility !== 'encrypted-for-me' && !(p.recipients && p.recipients.length > 0));
+        const mine = posts.filter(p => p.isMe && p.intentKind !== 'direct');
         const fp = mine.map(p => `${p.id}:${(p.reactionCounts||[]).map(r=>r.emoji+r.count).join(',')}:${p.commentCount||0}`).join('|');
         if (!force && fp === _myPostsFingerprint) return;
         _myPostsFingerprint = fp;
@@ -743,10 +743,12 @@ async function loadMessages(force) {
         ]);
         const followSet = new Set(follows.map(f => f.nodeId));
 
-        // Collect DMs: received encrypted-for-me OR my sent encrypted with recipients
+        // Collect DMs: intent-based with fallback for old posts without intentKind
         const dms = posts.filter(p => {
-            if (!p.isMe && p.visibility === 'encrypted-for-me') return true;
-            if (p.isMe && p.recipients && p.recipients.length > 0) return true;
+            if (p.intentKind === 'direct') return true;
+            // Fallback for pre-intent posts
+            if (p.intentKind === 'unknown' && !p.isMe && p.visibility === 'encrypted-for-me') return true;
+            if (p.intentKind === 'unknown' && p.isMe && p.recipients && p.recipients.length > 0) return true;
             return false;
         });
 
@@ -1402,8 +1404,8 @@ async function loadNetworkSummary() {
         networkSummaryEl.innerHTML = `<div class="diag-grid">
             <div class="diag-item"><span class="diag-value">${s.totalConnections}</span><span class="diag-label">Connections</span></div>
             <div class="diag-item"><span class="diag-value">${s.preferredCount}</span><span class="diag-label">Preferred</span></div>
-            <div class="diag-item"><span class="diag-value">${s.localCount}</span><span class="diag-label">Local</span></div>
-            <div class="diag-item"><span class="diag-value">${s.wideCount}</span><span class="diag-label">Wide</span></div>
+            <div class="diag-item"><span class="diag-value">${s.localCount}</span><span class="diag-label">Mesh</span></div>
+            <div class="diag-item"><span class="diag-value">${s.wideCount}</span><span class="diag-label">Non-mesh N1</span></div>
             <div class="diag-item"><span class="diag-value">${s.n2Distinct}</span><span class="diag-label">N2 Reach</span></div>
             <div class="diag-item"><span class="diag-value">${s.n3Distinct}</span><span class="diag-label">N3 Reach</span></div>
         </div>`;
@@ -1424,9 +1426,11 @@ async function loadConnections() {
                 const icon = generateIdenticon(c.nodeId, 18);
                 const slotClass = c.slotKind === 'Preferred' ? 'slot-preferred'
                     : c.slotKind === 'Wide' ? 'slot-wide' : 'slot-local';
+                const slotLabel = c.slotKind === 'Local' ? 'Mesh'
+                    : c.slotKind === 'Wide' ? 'Non-mesh N1' : c.slotKind;
                 const duration = c.connectedAt ? relativeTime(c.connectedAt) : '';
                 return `<div class="peer-card">
-                    <div class="peer-card-row">${icon} ${label} <span class="slot-badge ${slotClass}">${c.slotKind}</span></div>
+                    <div class="peer-card-row">${icon} ${label} <span class="slot-badge ${slotClass}">${slotLabel}</span></div>
                     <div class="peer-card-meta"><span>${duration}</span></div>
                 </div>`;
             }).join('');
@@ -1707,7 +1711,7 @@ async function loadPostMedia(container) {
         const postId = img.dataset.postId;
         const mime = img.dataset.mime || 'image/jpeg';
         try {
-            const filePath = await invoke('get_blob_path', { cidHex: cid });
+            const filePath = await invoke('get_blob_path', { cidHex: cid, postIdHex: postId });
             if (filePath && window.__TAURI__?.core?.convertFileSrc) {
                 const assetUrl = window.__TAURI__.core.convertFileSrc(filePath);
                 img.onerror = async () => {

website/contribute.html

@@ -10,6 +10,7 @@
 <body>
     <nav>
         <a href="index.html" class="logo">ItsGoin</a>
+        <button class="menu-toggle" onclick="this.parentElement.querySelector('.links').classList.toggle('open')" aria-label="Menu">&#9776;</button>
         <div class="links">
             <a href="index.html">About</a>
             <a href="tech.html">How It Works</a>

website/design.html

@@ -26,6 +26,7 @@
 <body>
     <nav>
         <a href="index.html" class="logo">ItsGoin</a>
+        <button class="menu-toggle" onclick="this.parentElement.querySelector('.links').classList.toggle('open')" aria-label="Menu">&#9776;</button>
         <div class="links">
             <a href="index.html">About</a>
             <a href="tech.html">How It Works</a>
@@ -43,7 +44,9 @@
             <p>This is the canonical technical reference for ItsGoin. It describes the vision, the architecture, and the current state of every subsystem &mdash; with full implementation detail. This document is versioned; each update records what changed.</p>
             <div class="card" style="margin-top: 1rem;">
                 <strong style="font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em;">Changelog</strong>
-                <p style="margin-top: 0.5rem;"><strong>v0.3.3</strong> (2026-03-16): Connection rate limiting &mdash; incoming auth failures rate-limited per source IP (3 attempts, exponential backoff to ~256s). Schema versioning &mdash; PRAGMA user_version tracks DB version with migration framework. N2/N3 freshness &mdash; TTL 7d&rarr;5h, full N1/N2 re-broadcast every 4h, startup sweep clears stale entries. Bootstrap isolation recovery &mdash; 24h check verifies bootstrap is in N1/N2/N3, reconnects + sticky N1 advertisement if absent. IPv6 HTTP address fix &mdash; nodes advertise actual public IPv6 (not 0.0.0.0) for share link redirects. Upstream tracking &mdash; post_upstream table records post source for engagement diff routing toward author. Video preload fix &mdash; share links and in-app videos use preload=auto. Following Online/Offline split. DM filter from My Posts. Any-type file attachments with download prompt + trust warning. Image lightbox. Audio player.</p>
+                <p style="margin-top: 0.5rem;"><strong>v0.3.5</strong> (2026-03-20): Private blob encryption &mdash; attachments on encrypted posts (Friends/Circle/Direct) now encrypted with same CEK as post text; public blobs unchanged; CID on ciphertext. Blob prefetch on sync &mdash; attachments eagerly fetched after post pull for offline availability. Crypto refactoring &mdash; extracted reusable primitives (encrypt/decrypt_bytes_with_cek, unwrap_cek_for_recipient, unwrap_group_cek). Intent-based post filtering &mdash; feed/myposts/messages filter on intentKind instead of encryption state. Blob decryption API (get_blob_for_post). Download filename sanitization.</p>
+                <p><strong>v0.3.4</strong> (2026-03-18): Comment edit &amp; delete with trust-based propagation. Native notifications via Tauri plugin (messages, posts, reactions, comments). Forward-compatible BlobHeaderDiffOp::Unknown variant. Following Online/Offline lightbox. Comment threading scoping fix. Dropdown text legibility fix. Mobile hamburger nav for website.</p>
+                <p><strong>v0.3.3</strong> (2026-03-16): Connection rate limiting &mdash; incoming auth failures rate-limited per source IP (3 attempts, exponential backoff to ~256s). Schema versioning &mdash; PRAGMA user_version tracks DB version with migration framework. N2/N3 freshness &mdash; TTL 7d&rarr;5h, full N1/N2 re-broadcast every 4h, startup sweep clears stale entries. Bootstrap isolation recovery &mdash; 24h check verifies bootstrap is in N1/N2/N3, reconnects + sticky N1 advertisement if absent. IPv6 HTTP address fix &mdash; nodes advertise actual public IPv6 (not 0.0.0.0) for share link redirects. Upstream tracking &mdash; post_upstream table records post source for engagement diff routing toward author. Video preload fix &mdash; share links and in-app videos use preload=auto. Following Online/Offline split. DM filter from My Posts. Any-type file attachments with download prompt + trust warning. Image lightbox. Audio player.</p>
                 <p><strong>v0.3.2</strong> (2026-03-14): Bidirectional engagement propagation &mdash; BlobHeaderDiff flows upstream + downstream through CDN tree. Auto downstream registration on pull sync/push notification. TCP hole punch protocol (TcpPunchRequest/Result 0xD6/0xD7). Tiered web serving (redirect &rarr; TCP punch &rarr; QUIC proxy). Video playback fix (asset protocol + blob URL fallback). On-demand blob fetch for synced posts missing blob data.</p>
                 <p><strong>v0.3.1</strong> (2026-03-13): Share links + QUIC proxy + content search. Share link format: <code>itsgoin.net/p/&lt;postid_hex&gt;/&lt;author_nodeid_hex&gt;</code> &mdash; simple, no host encoding needed. itsgoin.net web handler acts as QUIC proxy: receives browser request, searches the network for the post, fetches it on-demand via PostFetch (0xD4/0xD5), renders HTML, serves to browser. No permanent storage of fetched content. Extended worm search &mdash; <code>WormQuery</code> now carries optional <code>post_id</code> and <code>blob_id</code> fields for unified node/post/blob search. Each peer checks local storage, CDN downstream tree (up to 100 hosts per post), and blob store. <code>WormResponse</code> gains <code>post_holder</code> and <code>blob_holder</code> fields. Nova fan-out pattern &mdash; burst peers include one N2 wide referral; referred peer does its own 101-burst, reaching ~10K nodes with ~202 relay hops. PostFetch (0xD4/0xD5) &mdash; lightweight single-post retrieval after worm finds a holder, much lighter than full PullSync. itsgoin.net node deployed as anchor + web handler (<code>--web 8080</code>). &ldquo;Unavailable&rdquo; page with honest network model explanation + install CTA. Universal Links / App Links planned for native app interception. | Engagement sync &mdash; pull sync now fetches reactions, comments, and policies via BlobHeaderRequest/Response after every sync. Profile push fix &mdash; profile updates now sent to all connected mesh peers (not just audience). Auto-sync on follow &mdash; following a peer triggers immediate post pull + engagement fetch. Popover UI &mdash; notifications settings, network diagnostics, and message threads now open as popovers. Notification settings &mdash; per-key settings table in SQLite, configurable message/post/nearby notifications with JS Notification API. Tiered DM polling &mdash; smart message refresh based on conversation recency. Reaction display &mdash; posts show top 5 most popular emoji + total response count. UI cleanup &mdash; removed Suggested Peers and Find Nearby sections, placeholder text changed to &ldquo;How&rsquo;s it goin?&rdquo;, clickable node IDs in activity log.</p>
                 <p><strong>v0.3.0</strong> (2026-03-12): Full rename distsoc &rarr; ItsGoin. ALPN, crypto contexts, data paths, Android package ID all changed. Clean break &mdash; incompatible with prior versions.</p>

website/download.html

@@ -10,6 +10,7 @@
 <body>
     <nav>
         <a href="index.html" class="logo">ItsGoin</a>
+        <button class="menu-toggle" onclick="this.parentElement.querySelector('.links').classList.toggle('open')" aria-label="Menu">&#9776;</button>
         <div class="links">
             <a href="index.html">About</a>
             <a href="tech.html">How It Works</a>
@@ -24,16 +25,16 @@
         <section>
             <h1 style="font-size: 2rem; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 0.25rem;">Download ItsGoin</h1>
             <p>Available for Android and Linux. Free and open source.</p>
-            <p style="color: var(--text-muted); font-size: 0.85rem;">Version 0.3.4 &mdash; March 15, 2026</p>
+            <p style="color: var(--text-muted); font-size: 0.85rem;">Version 0.3.5 &mdash; March 15, 2026</p>
 
             <div class="downloads">
-                <a href="itsgoin-0.3.4.apk" class="download-btn btn-android">
+                <a href="itsgoin-0.3.5.apk" class="download-btn btn-android">
                     Android APK
-                    <span class="sub">v0.3.4</span>
+                    <span class="sub">v0.3.5</span>
                 </a>
-                <a href="itsgoin_0.3.4_amd64.AppImage" class="download-btn btn-linux">
+                <a href="itsgoin_0.3.5_amd64.AppImage" class="download-btn btn-linux">
                     Linux AppImage
-                    <span class="sub">v0.3.4</span>
+                    <span class="sub">v0.3.5</span>
                 </a>
             </div>
         </section>
@@ -45,7 +46,7 @@
                 <h3 style="color: var(--accent);">Android</h3>
                 <ol class="steps">
                     <li><strong>Download the APK</strong> &mdash; Tap the button above. Your browser may warn that this type of file can be harmful &mdash; tap <strong>Download anyway</strong>.</li>
-                    <li><strong>Open the file</strong> &mdash; When the download finishes, tap the notification or find <code>itsgoin-0.3.4.apk</code> in your Downloads folder and tap it.</li>
+                    <li><strong>Open the file</strong> &mdash; When the download finishes, tap the notification or find <code>itsgoin-0.3.5.apk</code> in your Downloads folder and tap it.</li>
                     <li><strong>Allow installation</strong> &mdash; Android will ask you to allow installs from this source. Tap <strong>Settings</strong>, toggle <strong>"Allow from this source"</strong>, then go back and tap <strong>Install</strong>.</li>
                     <li><strong>Launch the app</strong> &mdash; Once installed, tap <strong>Open</strong> or find ItsGoin in your app drawer.</li>
                 </ol>
@@ -58,8 +59,8 @@
                 <h3 style="color: var(--green);">Linux (AppImage)</h3>
                 <ol class="steps">
                     <li><strong>Download the AppImage</strong> &mdash; Click the button above to download.</li>
-                    <li><strong>Make it executable</strong> &mdash; Open a terminal and run:<br><code>chmod +x itsgoin_0.3.4_amd64.AppImage</code></li>
-                    <li><strong>Run it</strong> &mdash; Double-click the file, or from the terminal:<br><code>./itsgoin_0.3.4_amd64.AppImage</code></li>
+                    <li><strong>Make it executable</strong> &mdash; Open a terminal and run:<br><code>chmod +x itsgoin_0.3.5_amd64.AppImage</code></li>
+                    <li><strong>Run it</strong> &mdash; Double-click the file, or from the terminal:<br><code>./itsgoin_0.3.5_amd64.AppImage</code></li>
                 </ol>
                 <div class="note">
                     <strong>Note:</strong> If it doesn't launch, you may need to install FUSE:<br><code>sudo apt install libfuse2</code> (Debian/Ubuntu) or <code>sudo dnf install fuse</code> (Fedora).
@@ -70,6 +71,16 @@
         <section>
             <h2>Changelog</h2>
             <div class="changelog">
+                <div class="changelog-date">v0.3.5 &mdash; March 20, 2026</div>
+                <ul>
+                    <li><strong>Private blob encryption</strong> &mdash; Attachments on encrypted posts (Friends, Circle, Direct) are now encrypted with the same CEK as the post text. Public blobs remain plaintext. CID computed on ciphertext preserves content addressing.</li>
+                    <li><strong>Blob prefetch on sync</strong> &mdash; When posts are pulled from peers, their attachments are eagerly fetched for offline availability. Previously blobs were only fetched on view.</li>
+                    <li><strong>Crypto refactoring</strong> &mdash; Extracted reusable primitives: <code>encrypt_bytes_with_cek</code>, <code>decrypt_bytes_with_cek</code>, <code>unwrap_cek_for_recipient</code>, <code>unwrap_group_cek</code>. Foundation for encrypted blob storage and future chunk-level encryption.</li>
+                    <li><strong>Intent-based post filtering</strong> &mdash; Feed, My Posts, and Messages now filter on the author's original visibility intent (<code>intentKind</code>) rather than encryption state. Direct messages are identified by intent, not by being &ldquo;encrypted-for-me.&rdquo; Backward-compatible with pre-intent posts.</li>
+                    <li><strong>Blob decryption on retrieval</strong> &mdash; New <code>get_blob_for_post</code> API decrypts private blobs in context of their post&rsquo;s visibility. Public blobs pass through unchanged.</li>
+                    <li><strong>Download filename sanitization</strong> &mdash; Prevents path traversal in downloaded file names.</li>
+                </ul>
+
                 <div class="changelog-date">v0.3.4 &mdash; March 18, 2026</div>
                 <ul>
                     <li><strong>Comment edit &amp; delete</strong> &mdash; Edit or delete your own comments. Trust-based: post authors can also delete comments on their posts. Propagates via BlobHeaderDiff to all holders.</li>

website/index.html

@@ -10,6 +10,7 @@
 <body>
     <nav>
         <a href="index.html" class="logo">ItsGoin</a>
+        <button class="menu-toggle" onclick="this.parentElement.querySelector('.links').classList.toggle('open')" aria-label="Menu">&#9776;</button>
         <div class="links">
             <a href="index.html" class="active">About</a>
             <a href="tech.html">How It Works</a>

website/style.css

@@ -51,6 +51,15 @@ nav .links a {
     transition: color 0.15s;
 }
 nav .links a:hover, nav .links a.active { color: var(--text); text-decoration: none; }
+nav .menu-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; padding: 0.2rem; }
+
+@media (max-width: 640px) {
+    nav { padding: 0.75rem 1rem; gap: 0; justify-content: space-between; flex-wrap: wrap; }
+    nav .menu-toggle { display: block; }
+    nav .links { display: none; width: 100%; flex-direction: column; gap: 0; padding-top: 0.5rem; }
+    nav .links.open { display: flex; }
+    nav .links a { padding: 0.5rem 0; border-top: 1px solid var(--border); font-size: 0.95rem; }
+}
 
 /* --- Layout --- */
 .container { max-width: 800px; margin: 0 auto; padding: 3rem 2rem; }

website/tech.html

@@ -10,6 +10,7 @@
 <body>
     <nav>
         <a href="index.html" class="logo">ItsGoin</a>
+        <button class="menu-toggle" onclick="this.parentElement.querySelector('.links').classList.toggle('open')" aria-label="Menu">&#9776;</button>
         <div class="links">
             <a href="index.html">About</a>
             <a href="tech.html" class="active">How It Works</a>