ssb: Work in progress invite support. We can generate them. We can connect using an invite code. We can't yet invite.use().

src/ssb.db.c

@@ -9,6 +9,8 @@
 #include "ow-crypt.h"
 #include "sodium/crypto_hash_sha256.h"
 #include "sodium/crypto_sign.h"
+#include "sodium/crypto_sign_ed25519.h"
+#include "sodium/randombytes.h"
 #include "sqlite3.h"
 #include "uv.h"
 
@@ -168,6 +170,14 @@ void tf_ssb_db_init(tf_ssb_t* ssb)
 	_tf_ssb_db_exec(db, "CREATE INDEX IF NOT EXISTS identities_user ON identities (user, public_key)");
 	_tf_ssb_db_exec(db, "DELETE FROM identities WHERE user = ':auth'");
 
+	_tf_ssb_db_exec(db,
+		"CREATE TABLE IF NOT EXISTS invites ("
+		"  invite_public_key TEXT PRIMARY KEY,"
+		"  account TEXT,"
+		"  use_count INTEGER,"
+		"  expires INTEGER"
+		")");
+
 	bool populate_fts = false;
 	if (!_tf_ssb_db_has_rows(db, "PRAGMA table_list('messages_fts')"))
 	{
@@ -2137,3 +2147,44 @@ const char* tf_ssb_db_get_profile_name(sqlite3* db, const char* id)
 	}
 	return result;
 }
+
+bool tf_ssb_db_generate_invite(sqlite3* db, const char* id, const char* host, int port, int use_count, int expires_seconds, char* out_invite, size_t size)
+{
+	if (use_count < -1 || use_count == 0)
+	{
+		return false;
+	}
+
+	uint8_t public_key[crypto_sign_ed25519_PUBLICKEYBYTES] = { 0 };
+	uint8_t secret_key[crypto_sign_ed25519_SECRETKEYBYTES] = { 0 };
+	uint8_t seed[crypto_sign_ed25519_SEEDBYTES] = { 0 };
+
+	randombytes_buf(seed, sizeof(seed));
+	crypto_sign_ed25519_seed_keypair(public_key, secret_key, seed);
+
+	char public[k_id_base64_len];
+	tf_ssb_id_bin_to_str(public, sizeof(public), public_key);
+	tf_printf("invite is for public key %s\n", public);
+
+	char seed_b64[64];
+	tf_base64_encode(seed, sizeof(seed), seed_b64, sizeof(seed_b64));
+
+	bool inserted = false;
+	sqlite3_stmt* statement;
+	if (sqlite3_prepare(db,
+		"INSERT INTO invites (invite_public_key, account, use_count, expires) VALUES (?, ?, ?, ?)",
+		-1, &statement, NULL) == SQLITE_OK)
+	{
+		if (sqlite3_bind_text(statement, 1, public, -1, NULL) == SQLITE_OK &&
+			sqlite3_bind_text(statement, 2, id, -1, NULL) == SQLITE_OK &&
+			sqlite3_bind_int(statement, 3, use_count) == SQLITE_OK &&
+			sqlite3_bind_int64(statement, 4, (int64_t)time(NULL) + expires_seconds) == SQLITE_OK)
+		{
+			inserted = sqlite3_step(statement) == SQLITE_DONE;
+		}
+		sqlite3_finalize(statement);
+	}
+
+	snprintf(out_invite, size, "%s:%d:%s~%s", host, port, id, seed_b64);
+	return inserted;
+}