damus

commit 92e1e4b08f359ff7004dc253230ee2cfe926eda9
parent ffc50bb2c1dec6e84ba68dc516e0c3feb2fceefe
Author: William Casarin <jb55@jb55.com>
Date:   Tue, 30 Apr 2024 23:19:05 +0200

nostrdb: api: add ndb_note_json

add a way to write an ndb note as json to a buffer

Signed-off-by: William Casarin <jb55@jb55.com>

Diffstat:
M
nostrdb/src/nostrdb.c
 | 
48
++++++++++++++++++++++++++++++++++++++++++++++++
M
nostrdb/src/nostrdb.h
 | 
3
+++

2 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/nostrdb/src/nostrdb.c b/nostrdb/src/nostrdb.c
@@ -4726,6 +4726,54 @@ static int ndb_event_commitment(struct ndb_note *ev, unsigned char *buf, int buf
 	return cur.p - cur.start;
 }
 
+static int cursor_push_hex(struct cursor *c, unsigned char *bytes, int len)
+{
+	int i;
+	unsigned char chr;
+	if (c->p + (len * 2) >= c->end)
+		return 0;
+
+	for (i = 0; i < len; i++) {
+		chr = bytes[i];
+
+		*(c->p++) = hexchar(chr >> 4);
+		*(c->p++) = hexchar(chr & 0xF);
+	}
+
+	return 1;
+}
+
+static int cursor_push_int_str(struct cursor *c, int num)
+{
+	char timebuf[16] = {0};
+	snprintf(timebuf, sizeof(timebuf), "%d", num);
+	return cursor_push_str(c, timebuf);
+}
+
+int ndb_note_json(struct ndb_note *note, char *buf, int buflen)
+{
+	struct cursor cur, *c = &cur;
+
+	make_cursor((unsigned char *)buf, (unsigned char*)buf + buflen, &cur);
+
+	return cursor_push_str(c, "{\"id\":\"") &&
+	       cursor_push_hex(c, ndb_note_id(note), 32) &&
+	       cursor_push_str(c, "\",\"pubkey\":\"") &&
+	       cursor_push_hex(c, ndb_note_pubkey(note), 32) &&
+	       cursor_push_str(c, "\",\"created_at\":") &&
+	       cursor_push_int_str(c, ndb_note_created_at(note)) &&
+	       cursor_push_str(c, ",\"kind\":") &&
+	       cursor_push_int_str(c, ndb_note_kind(note)) &&
+	       cursor_push_str(c, ",\"tags\":") &&
+	       cursor_push_json_tags(c, note) &&
+	       cursor_push_str(c, ",\"content\":") &&
+	       cursor_push_jsonstr(c, ndb_note_content(note)) &&
+	       cursor_push_str(c, ",\"sig\":\"") &&
+	       cursor_push_hex(c, ndb_note_sig(note), 64) &&
+	       cursor_push_c_str(c, "\"}");
+
+}
+
 int ndb_calculate_id(struct ndb_note *note, unsigned char *buf, int buflen) {
 	int len;
 
diff --git a/nostrdb/src/nostrdb.h b/nostrdb/src/nostrdb.h
@@ -532,6 +532,9 @@ void _ndb_note_set_kind(struct ndb_note *note, uint32_t kind);
 struct ndb_tags *ndb_note_tags(struct ndb_note *note);
 int ndb_str_len(struct ndb_str *str);
 
+/// write the note as json to a buffer
+int ndb_note_json(struct ndb_note *, char *buf, int buflen);
+
 // TAGS
 void ndb_tags_iterate_start(struct ndb_note *note, struct ndb_iterator *iter);
 uint16_t ndb_tags_count(struct ndb_tags *);