nip19: add kind to naddr & nevent

Add support for type KIND for bech32-encoded entities naddr and nevent
as specified in NIP-19.

LNURL1DP68GURN8GHJ7EM9W3SKCCNE9E3K7MF0D3H82UNVWQHKWUN9V4HXGCTHDC6RZVGR8SW3G

Signed-off-by: kernelkind <[email protected]>
Reviewed-by: William Casarin <[email protected]>
Signed-off-by: William Casarin <[email protected]>

Author: kernelkind

damus-c/nostr_bech32.c

@@ -7,8 +7,10 @@
 
 #include "nostr_bech32.h"
 #include <stdlib.h>
+#include "endian.h"
 #include "cursor.h"
 #include "bech32.h"
+#include <stdbool.h>
 
 #define MAX_TLVS 16
 
@@ -145,6 +147,11 @@ static int tlvs_to_relays(struct nostr_tlvs *tlvs, struct relays *relays) {
     return 1;
 }
 
+static uint32_t decode_tlv_u32(const uint8_t *bytes) {
+    beint32_t *be32_bytes = (beint32_t*)bytes;
+    return be32_to_cpu(*be32_bytes);
+}
+
 static int parse_nostr_bech32_nevent(struct cursor *cur, struct bech32_nevent *nevent) {
     struct nostr_tlvs tlvs;
     struct nostr_tlv *tlv;
@@ -166,6 +173,13 @@ static int parse_nostr_bech32_nevent(struct cursor *cur, struct bech32_nevent *n
         nevent->pubkey = NULL;
     }
 
+    if(find_tlv(&tlvs, TLV_KIND, &tlv)) {
+        nevent->kind = decode_tlv_u32(tlv->value);
+        nevent->has_kind = true;
+    } else {
+        nevent->has_kind = false;
+    }
+    
     return tlvs_to_relays(&tlvs, &nevent->relays);
 }
 
@@ -187,6 +201,11 @@ static int parse_nostr_bech32_naddr(struct cursor *cur, struct bech32_naddr *nad
 
     naddr->pubkey = tlv->value;
 
+    if(!find_tlv(&tlvs, TLV_KIND, &tlv)) {
+        return 0;
+    }
+    naddr->kind = decode_tlv_u32(tlv->value);
+    
     return tlvs_to_relays(&tlvs, &naddr->relays);
 }
 

damus-c/nostr_bech32.h

@@ -11,6 +11,8 @@
 #include <stdio.h>
 #include "str_block.h"
 #include "cursor.h"
+#include <stdbool.h>
+
 typedef unsigned char u8;
 #define MAX_RELAYS 10
 
@@ -45,6 +47,8 @@ struct bech32_nevent {
     struct relays relays;
     const u8 *event_id;
     const u8 *pubkey; // optional
+    uint32_t kind;
+    bool has_kind;
 };
 
 struct bech32_nprofile {
@@ -56,6 +60,7 @@ struct bech32_naddr {
     struct relays relays;
     struct str_block identifier;
     const u8 *pubkey;
+    uint32_t kind;
 };
 
 struct bech32_nrelay {