tildefriends/src/ssb.rpc.c

#include "ssb.rpc.h"

#include "mem.h"
#include "ssb.h"
#include "ssb.db.h"
#include "util.js.h"

#include "sqlite3.h"

#include <inttypes.h>
#include <string.h>
#include <time.h>

#if !defined(_countof)
#define _countof(a) ((int)(sizeof((a)) / sizeof(*(a))))
#endif

static void _tf_ssb_connection_send_history_stream(tf_ssb_connection_t* connection, int32_t request_number, const char* author, int64_t sequence, bool keys, bool live);
static void _tf_ssb_connection_send_history_stream_internal(tf_ssb_connection_t* connection, int32_t request_number, const char* author, int64_t sequence, bool keys, bool live);

static void _tf_ssb_rpc_gossip_ping_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	char buffer[256];
	snprintf(buffer, sizeof(buffer), "%" PRId64, (int64_t)time(NULL) * 1000);
	tf_ssb_connection_rpc_send(
		connection,
		flags,
		-request_number,
		(const uint8_t*)buffer,
		strlen(buffer),
		NULL,
		NULL,
		NULL);
	if (flags & k_ssb_rpc_flag_end_error)
	{
		tf_ssb_connection_remove_request(connection, request_number);
	}
}

static void _tf_ssb_rpc_gossip_ping(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_connection_add_request(connection, -request_number, _tf_ssb_rpc_gossip_ping_callback, NULL, NULL, NULL);
}

static void _tf_ssb_rpc_blobs_get(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	if (flags & k_ssb_rpc_flag_end_error)
	{
		return;
	}

	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_connection_get_context(connection);
	JSValue ids = JS_GetPropertyStr(context, args, "args");
	int length = tf_util_get_length(context, ids);
	bool success = false;
	for (int i = 0; i < length; i++)
	{
		JSValue arg = JS_GetPropertyUint32(context, ids, i);
		const char* id = NULL;
		if (JS_IsString(arg))
		{
			id = JS_ToCString(context, arg);
		}
		else
		{
			JSValue key = JS_GetPropertyStr(context, arg, "key");
			id = JS_ToCString(context, key);
			JS_FreeValue(context, key);
		}
		uint8_t* blob = NULL;
		size_t size = 0;
		const size_t k_send_max = 8192;
		if (tf_ssb_db_blob_get(ssb, id, &blob, &size))
		{
			for (size_t offset = 0; offset < size; offset += k_send_max)
			{
				tf_ssb_connection_rpc_send(
					connection,
					k_ssb_rpc_flag_binary | k_ssb_rpc_flag_stream,
					-request_number,
					blob + offset,
					offset + k_send_max <= size ? k_send_max : (size - offset),
					NULL,
					NULL,
					NULL);
			}
			success = true;
			tf_free(blob);
		}
		JS_FreeCString(context, id);
		JS_FreeValue(context, arg);
	}
	JS_FreeValue(context, ids);
	tf_ssb_connection_rpc_send(
		connection,
		k_ssb_rpc_flag_json | k_ssb_rpc_flag_end_error | k_ssb_rpc_flag_stream,
		-request_number,
		(const uint8_t*)(success ? "true" : "false"),
		strlen(success ? "true" : "false"),
		NULL,
		NULL,
		NULL);
}

static void _tf_ssb_rpc_blobs_has(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_connection_get_context(connection);
	JSValue ids = JS_GetPropertyStr(context, args, "args");
	JSValue id = JS_GetPropertyUint32(context, ids, 0);
	const char* id_str = JS_ToCString(context, id);
	bool has = tf_ssb_db_blob_has(ssb, id_str);
	JS_FreeCString(context, id_str);
	JS_FreeValue(context, id);
	JS_FreeValue(context, ids);
	tf_ssb_connection_rpc_send(
		connection,
		k_ssb_rpc_flag_json,
		-request_number,
		(const uint8_t*)(has ? "true" : "false"),
		strlen(has ? "true" : "false"),
		NULL,
		NULL,
		NULL);
}

static void _tf_ssb_rpc_blob_wants_added_callback(tf_ssb_t* ssb, const char* id, void* user_data)
{
	tf_ssb_connection_t* connection = user_data;
	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue message = JS_NewObject(context);
	JS_SetPropertyStr(context, message, id, JS_NewInt64(context, -1));
	tf_ssb_connection_rpc_send_json(connection, k_ssb_rpc_flag_stream, -blob_wants->request_number, message, NULL, NULL, NULL);
	JS_FreeValue(context, message);
}

static void _tf_ssb_rpc_request_more_blobs(tf_ssb_connection_t* connection)
{
	JSContext* context = tf_ssb_connection_get_context(connection);
	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	sqlite3* db = tf_ssb_acquire_db_reader(ssb);
	sqlite3_stmt* statement;
	if (sqlite3_prepare(db, "SELECT id FROM blob_wants_view WHERE id > ? ORDER BY id LIMIT 32", -1, &statement, NULL) == SQLITE_OK)
	{
		if (sqlite3_bind_text(statement, 1, blob_wants->last_id, -1, NULL) == SQLITE_OK)
		{
			while (sqlite3_step(statement) == SQLITE_ROW)
			{
				const char* blob = (const char*)sqlite3_column_text(statement, 0);
				JSValue message = JS_NewObject(context);
				JS_SetPropertyStr(context, message, blob, JS_NewInt32(context, -1));
				tf_ssb_connection_rpc_send_json(connection, k_ssb_rpc_flag_stream, -blob_wants->request_number, message, NULL, NULL, NULL);
				JS_FreeValue(context, message);
				snprintf(blob_wants->last_id, sizeof(blob_wants->last_id), "%s", blob);
				blob_wants->wants_sent++;
			}
		}
		sqlite3_finalize(statement);
	}
	tf_ssb_release_db_reader(ssb, db);
}

static void _tf_ssb_rpc_blobs_createWants(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	tf_ssb_add_blob_want_added_callback(ssb, _tf_ssb_rpc_blob_wants_added_callback, NULL, connection);
	blob_wants->request_number = request_number;
	_tf_ssb_rpc_request_more_blobs(connection);
}

typedef struct tunnel_t
{
	tf_ssb_connection_t* connection;
	int32_t request_number;
} tunnel_t;

void _tf_ssb_rpc_tunnel_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tunnel_t* tun = user_data;
	tf_ssb_connection_rpc_send(tun->connection, flags, tun->request_number, message, size, NULL, NULL, NULL);
}

void _tf_ssb_rpc_tunnel_cleanup(tf_ssb_t* ssb, void* user_data)
{
	tf_free(user_data);
}

static bool _get_global_setting_bool(tf_ssb_t* ssb, const char* name, bool default_value)
{
	bool result = default_value;
	JSContext* context = tf_ssb_get_context(ssb);
	sqlite3* db = tf_ssb_acquire_db_reader(ssb);
	sqlite3_stmt* statement;
	if (sqlite3_prepare(db, "SELECT value FROM properties WHERE id = 'core' AND key = 'settings'", -1, &statement, NULL) == SQLITE_OK)
	{
		if (sqlite3_step(statement) == SQLITE_ROW)
		{
			JSValue value = JS_ParseJSON(context, (const char*)sqlite3_column_text(statement, 0), sqlite3_column_bytes(statement, 0), NULL);
			JSValue property = JS_GetPropertyStr(context, value,  name);
			if (JS_IsBool(property))
			{
				result = JS_ToBool(context, property);
			}
			JS_FreeValue(context, property);
			JS_FreeValue(context, value);
		}
		sqlite3_finalize(statement);
	}
	tf_ssb_release_db_reader(ssb, db);
	return result;
}

static bool _get_global_setting_string(tf_ssb_t* ssb, const char* name, char* out_value, size_t size)
{
	bool result = false;
	JSContext* context = tf_ssb_get_context(ssb);
	sqlite3* db = tf_ssb_acquire_db_reader(ssb);
	sqlite3_stmt* statement;
	if (sqlite3_prepare(db, "SELECT value FROM properties WHERE id = 'core' AND key = 'settings'", -1, &statement, NULL) == SQLITE_OK)
	{
		if (sqlite3_step(statement) == SQLITE_ROW)
		{
			JSValue value = JS_ParseJSON(context, (const char*)sqlite3_column_text(statement, 0), sqlite3_column_bytes(statement, 0), NULL);
			JSValue property = JS_GetPropertyStr(context, value, name);
			const char* value_string = JS_ToCString(context, property);
			if (value_string)
			{
				snprintf(out_value, size, "%s", value_string);
				result = true;
				JS_FreeCString(context, value_string);
			}
			JS_FreeValue(context, property);
			JS_FreeValue(context, value);
		}
		sqlite3_finalize(statement);
	}
	tf_ssb_release_db_reader(ssb, db);
	return result;
}

static void _tf_ssb_rpc_tunnel_connect(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	if (!_get_global_setting_bool(ssb, "room", true))
	{
		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "tunnel.connect");
		return;
	}

	JSContext* context = tf_ssb_connection_get_context(connection);
	JSValue arg_array = JS_GetPropertyStr(context, args, "args");
	JSValue arg = JS_GetPropertyUint32(context, arg_array, 0);
	JSValue origin = JS_GetPropertyStr(context, arg, "origin");
	JSValue portal = JS_GetPropertyStr(context, arg, "portal");
	JSValue target = JS_GetPropertyStr(context, arg, "target");

	if (JS_IsUndefined(origin) &&
		!JS_IsUndefined(portal) && 
		!JS_IsUndefined(target))
	{
		const char* target_str = JS_ToCString(context, target);

		tf_ssb_connection_t* target_connection = tf_ssb_connection_get(ssb, target_str);
		if (target_connection)
		{
			int32_t tunnel_request_number = tf_ssb_connection_next_request_number(target_connection);
			const char* portal_str = JS_ToCString(context, portal);

			JSValue message = JS_NewObject(context);
			JSValue name = JS_NewArray(context);
			JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "tunnel"));
			JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "connect"));
			JS_SetPropertyStr(context, message, "name", name);
			JSValue arg_obj = JS_NewObject(context);
			char origin_str[k_id_base64_len] = "";
			tf_ssb_connection_get_id(connection, origin_str, sizeof(origin_str));
			JS_SetPropertyStr(context, arg_obj, "origin", JS_NewString(context, origin_str));
			JS_SetPropertyStr(context, arg_obj, "portal", JS_NewString(context, portal_str));
			JS_SetPropertyStr(context, arg_obj, "target", JS_NewString(context, target_str));
			JSValue arg_array = JS_NewArray(context);
			JS_SetPropertyUint32(context, arg_array, 0, arg_obj);
			JS_SetPropertyStr(context, message, "args", arg_array);
			JS_SetPropertyStr(context, message, "type", JS_NewString(context, "duplex"));

			tf_ssb_connection_rpc_send_json(
				target_connection,
				k_ssb_rpc_flag_stream,
				tunnel_request_number,
				message,
				NULL,
				NULL,
				NULL);

			tunnel_t* data0 = tf_malloc(sizeof(tunnel_t));
			*data0 = (tunnel_t)
			{
				.connection = target_connection,
				.request_number = tunnel_request_number,
			};
			tunnel_t* data1 = tf_malloc(sizeof(tunnel_t));
			*data1 = (tunnel_t)
			{
				.connection = connection,
				.request_number = -request_number,
			};
			tf_ssb_connection_add_request(connection, -request_number, _tf_ssb_rpc_tunnel_callback, _tf_ssb_rpc_tunnel_cleanup, data0, target_connection);
			tf_ssb_connection_add_request(target_connection, tunnel_request_number, _tf_ssb_rpc_tunnel_callback, _tf_ssb_rpc_tunnel_cleanup, data1, connection);

			JS_FreeValue(context, message);
			JS_FreeCString(context, portal_str);
		}
		JS_FreeCString(context, target_str);
	}
	else if (!JS_IsUndefined(origin) &&
		!JS_IsUndefined(portal) && 
		!JS_IsUndefined(target))
	{
		const char* origin_str = JS_ToCString(context, origin);
		const char* portal_str = JS_ToCString(context, portal);
		const char* target_str = JS_ToCString(context, target);
		tf_ssb_connection_tunnel_create(ssb, portal_str, -request_number, origin_str);
		JS_FreeCString(context, origin_str);
		JS_FreeCString(context, portal_str);
		JS_FreeCString(context, target_str);
	}

	JS_FreeValue(context, origin);
	JS_FreeValue(context, portal);
	JS_FreeValue(context, target);
	JS_FreeValue(context, arg);
	JS_FreeValue(context, arg_array);
}

static void _tf_ssb_rpc_room_meta(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue response = JS_FALSE;
	if (_get_global_setting_bool(ssb, "room", true))
	{
		char room_name[1024] = "tilde friends tunnel";
		_get_global_setting_string(ssb, "room_name", room_name, sizeof(room_name));
		response = JS_NewObject(context);
		JS_SetPropertyStr(context, response, "name", JS_NewString(context, room_name));
		JS_SetPropertyStr(context, response, "membership", JS_FALSE);
		JSValue features = JS_NewArray(context);
		JS_SetPropertyUint32(context, features, 0, JS_NewString(context, "tunnel"));
		JS_SetPropertyUint32(context, features, 1, JS_NewString(context, "room1"));
		JS_SetPropertyUint32(context, features, 2, JS_NewString(context, "room2"));
		JS_SetPropertyStr(context, response, "features", features);
	}
	tf_ssb_connection_rpc_send_json(
		connection,
		flags,
		-request_number,
		response,
		NULL,
		NULL,
		NULL);
	JS_FreeValue(context, response);
}

static void _tf_ssb_rpc_room_attendants(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	if (!_get_global_setting_bool(ssb, "room", true))
	{
		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "room.attendants");
		return;
	}

	JSContext* context = tf_ssb_get_context(ssb);
	JSValue joined = JS_NewObject(context);
	JS_SetPropertyStr(context, joined, "type", JS_NewString(context, "joined"));
	char my_id[k_id_base64_len] = "";
	if (tf_ssb_connection_get_id(connection, my_id, sizeof(my_id)))
	{
		JS_SetPropertyStr(context, joined, "id", JS_NewString(context, my_id));
	}

	JSValue state = JS_NewObject(context);
	JS_SetPropertyStr(context, state, "type", JS_NewString(context, "state"));
	JSValue ids = JS_NewArray(context);
	int id_count = 0;
	tf_ssb_connection_t* connections[1024];
	int count = tf_ssb_get_connections(ssb, connections, _countof(connections));

	for (int i = 0; i < count; i++)
	{
		char id[k_id_base64_len] = { 0 };
		if (tf_ssb_connection_is_attendant(connections[i]) &&
			tf_ssb_connection_get_id(connections[i], id, sizeof(id)))
		{
			JS_SetPropertyUint32(context, ids, id_count++, JS_NewString(context, id));

			tf_ssb_connection_rpc_send_json(
				connections[i],
				flags,
				-tf_ssb_connection_get_attendant_request_number(connections[i]),
				joined,
				NULL,
				NULL,
				NULL);
		}
	}
	JS_SetPropertyStr(context, state, "ids", ids);
	tf_ssb_connection_rpc_send_json(connection, flags, -request_number, state, NULL, NULL, NULL);
	JS_FreeValue(context, joined);
	JS_FreeValue(context, state);

	tf_ssb_connection_set_attendant(connection, true, request_number);
}

typedef struct _blobs_get_t
{
	char id[k_blob_id_len];
	size_t received;
	size_t expected_size;
	char buffer[];
} blobs_get_t;

static void _tf_ssb_rpc_connection_blobs_get_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	blobs_get_t* get = user_data;
	if ((flags & k_ssb_rpc_mask_type) == k_ssb_rpc_flag_binary && size > 0 && get->received + size <= get->expected_size)
	{
		memcpy(get->buffer + get->received, message, size);
		get->received += size;
	}
	else if ((flags & k_ssb_rpc_mask_type) == k_ssb_rpc_flag_json)
	{
		bool stored = false;
		if (JS_ToBool(context, args))
		{
			char id[256];
			stored = tf_ssb_db_blob_store(ssb, (uint8_t*)get->buffer, get->expected_size, id, sizeof(id), NULL);
		}
		tf_ssb_connection_rpc_send(
			connection,
			k_ssb_rpc_flag_json | k_ssb_rpc_flag_stream | k_ssb_rpc_flag_end_error,
			-request_number,
			(const uint8_t*)(stored ? "true" : "false"),
			strlen(stored ? "true" : "false"),
			NULL,
			NULL,
			NULL);
	}
}

static void _tf_ssb_rpc_connection_blobs_get_cleanup(tf_ssb_t* ssb, void* user_data)
{
	tf_free(user_data);
}

static void _tf_ssb_rpc_connection_blobs_get(tf_ssb_connection_t* connection, const char* blob_id, size_t size)
{
	blobs_get_t* get = tf_malloc(sizeof(blobs_get_t) + size);
	*get = (blobs_get_t) { .expected_size = size };
	snprintf(get->id, sizeof(get->id), "%s", blob_id);
	memset(get->buffer, 0, size);

	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue message = JS_NewObject(context);
	JSValue name = JS_NewArray(context);
	JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "blobs"));
	JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "get"));
	JS_SetPropertyStr(context, message, "name", name);
	JS_SetPropertyStr(context, message, "type", JS_NewString(context, "source"));
	JSValue args = JS_NewArray(context);
	JS_SetPropertyUint32(context, args, 0, JS_NewString(context, blob_id));
	JS_SetPropertyStr(context, message, "args", args);

	tf_ssb_connection_rpc_send_json(
		connection,
		k_ssb_rpc_flag_stream,
		tf_ssb_connection_next_request_number(connection),
		message,
		_tf_ssb_rpc_connection_blobs_get_callback,
		_tf_ssb_rpc_connection_blobs_get_cleanup,
		get);

	JS_FreeValue(context, message);
}

static void _tf_ssb_rpc_connection_blobs_createWants_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
	if (!blob_wants)
	{
		return;
	}

	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_connection_get_context(connection);

	JSValue name = JS_GetPropertyStr(context, args, "name");
	if (!JS_IsUndefined(name))
	{
		/* { name: "Error" } */
		JS_FreeValue(context, name);
		return;
	}

	JSPropertyEnum* ptab;
	uint32_t plen;
	JS_GetOwnPropertyNames(context, &ptab, &plen, args, JS_GPN_STRING_MASK);
	for (uint32_t i = 0; i < plen; ++i)
	{
		JSValue key = JS_AtomToString(context, ptab[i].atom);
		JSPropertyDescriptor desc;
		JSValue key_value = JS_NULL;
		if (JS_GetOwnProperty(context, &desc, args, ptab[i].atom) == 1)
		{
			key_value = desc.value;
			JS_FreeValue(context, desc.setter);
			JS_FreeValue(context, desc.getter);
		}
		const char* blob_id = JS_ToCString(context, key);
		int64_t size = 0;
		JS_ToInt64(context, &size, key_value);
		if (--blob_wants->wants_sent == 0)
		{
			_tf_ssb_rpc_request_more_blobs(connection);
		}
		if (size < 0)
		{
			size_t blob_size = 0;
			if (tf_ssb_db_blob_get(ssb, blob_id, NULL, &blob_size))
			{
				JSValue message = JS_NewObject(context);
				JS_SetPropertyStr(context, message, blob_id, JS_NewInt64(context, blob_size));
				tf_ssb_connection_rpc_send_json(
					connection,
					k_ssb_rpc_flag_stream,
					-blob_wants->request_number,
					message,
					NULL,
					NULL,
					NULL);
				JS_FreeValue(context, message);
			}
			else if (size == -1LL)
			{
				JSValue message = JS_NewObject(context);
				JS_SetPropertyStr(context, message, blob_id, JS_NewInt64(context, -2));
				tf_ssb_connection_rpc_send_json(
					connection,
					k_ssb_rpc_flag_stream,
					-blob_wants->request_number,
					message,
					NULL,
					NULL,
					NULL);
				JS_FreeValue(context, message);
			}
		}
		else
		{
			_tf_ssb_rpc_connection_blobs_get(connection, blob_id, size);
		}
		JS_FreeCString(context, blob_id);
		JS_FreeValue(context, key);
		JS_FreeValue(context, key_value);
	}
	for (uint32_t i = 0; i < plen; ++i)
	{
		JS_FreeAtom(context, ptab[i].atom);
	}
	js_free(context, ptab);
}

static void _tf_ssb_rpc_connection_room_attendants_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue type = JS_GetPropertyStr(context, args, "type");
	const char* type_string = JS_ToCString(context, type);
	if (!type_string)
	{
		tf_ssb_connection_rpc_send_error(connection, flags, -request_number, "Missing type.");
	}
	else if (strcmp(type_string, "state") == 0)
	{
		tf_ssb_connection_clear_room_attendants(connection);
		JSValue ids = JS_GetPropertyStr(context, args, "ids");
		int length = tf_util_get_length(context, ids);
		for (int i = 0; i < length; i++)
		{
			JSValue id = JS_GetPropertyUint32(context, ids, i);
			const char* id_string = JS_ToCString(context, id);
			if (id_string)
			{
				tf_ssb_connection_add_room_attendant(connection, id_string);
			}
			JS_FreeCString(context, id_string);
			JS_FreeValue(context, id);
		}
		JS_FreeValue(context, ids);
	}
	else if (strcmp(type_string, "joined") == 0)
	{
		JSValue id = JS_GetPropertyStr(context, args, "id");
		const char* id_string = JS_ToCString(context, id);
		if (id_string)
		{
			tf_ssb_connection_add_room_attendant(connection, id_string);
		}
		JS_FreeCString(context, id_string);
		JS_FreeValue(context, id);
	}
	else if (strcmp(type_string, "left") == 0)
	{
		JSValue id = JS_GetPropertyStr(context, args, "id");
		const char* id_string = JS_ToCString(context, id);
		if (id_string)
		{
			tf_ssb_connection_remove_room_attendant(connection, id_string);
		}
		JS_FreeCString(context, id_string);
		JS_FreeValue(context, id);
	}
	else
	{
		tf_ssb_connection_rpc_send_error(connection, flags, -request_number, "Unexpected room.attendants response type.");
	}
	JS_FreeCString(context, type_string);
	JS_FreeValue(context, type);
}

static bool _is_error(JSContext* context, JSValue message)
{
	JSValue name = JS_GetPropertyStr(context, message, "name");
	const char* name_string = JS_ToCString(context, name);
	bool is_error = false;
	if (name_string && strcmp(name_string, "Error") == 0)
	{
		is_error = true;
	}
	JS_FreeCString(context, name_string);
	JS_FreeValue(context, name);
	return is_error;
}

static void _tf_ssb_rpc_connection_tunnel_isRoom_callback(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	if (_is_error(context, args))
	{
		return;
	}

	if (JS_IsObject(args))
	{
		JSValue message = JS_NewObject(context);
		JSValue name = JS_NewArray(context);
		JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "room"));
		JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "attendants"));
		JS_SetPropertyStr(context, message, "name", name);
		JS_SetPropertyStr(context, message, "type", JS_NewString(context, "source"));
		JS_SetPropertyStr(context, message, "args", JS_NewArray(context));
		tf_ssb_connection_rpc_send_json(
			connection,
			k_ssb_rpc_flag_stream,
			tf_ssb_connection_next_request_number(connection),
			message,
			_tf_ssb_rpc_connection_room_attendants_callback,
			NULL,
			NULL);
		JS_FreeValue(context, message);
	}
}

typedef struct _tf_ssb_connection_send_history_stream_t
{
	int32_t request_number;
	char author[k_id_base64_len];
	int64_t sequence;
	bool keys;
	bool live;
} tf_ssb_connection_send_history_stream_t;

static void _tf_ssb_connection_send_history_stream_callback(tf_ssb_connection_t* connection, void* user_data)
{
	tf_ssb_connection_send_history_stream_t* request = user_data;
	if (tf_ssb_connection_is_connected(connection))
	{
		_tf_ssb_connection_send_history_stream_internal(connection, request->request_number, request->author, request->sequence, request->keys, request->live);
	}
	tf_free(request);
}

static void _tf_ssb_connection_send_history_stream_internal(tf_ssb_connection_t* connection, int32_t request_number, const char* author, int64_t sequence, bool keys, bool live)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	sqlite3* db = tf_ssb_acquire_db_reader(ssb);
	sqlite3_stmt* statement;
	const int k_max = 32;
	int64_t max_sequence_seen = 0;
	if (sqlite3_prepare(db, "SELECT previous, author, id, sequence, timestamp, hash, content, signature, sequence_before_author FROM messages WHERE author = ?1 AND sequence >= ?2 AND sequence < ?3 ORDER BY sequence", -1, &statement, NULL) == SQLITE_OK)
	{
		if (sqlite3_bind_text(statement, 1, author, -1, NULL) == SQLITE_OK &&
			sqlite3_bind_int64(statement, 2, sequence) == SQLITE_OK &&
			sqlite3_bind_int64(statement, 3, sequence + k_max) == SQLITE_OK)
		{
			while (sqlite3_step(statement) == SQLITE_ROW)
			{
				JSValue message = JS_UNDEFINED;
				max_sequence_seen = sqlite3_column_int64(statement, 3);

				JSValue formatted = tf_ssb_format_message(
					context,
					(const char*)sqlite3_column_text(statement, 0),
					(const char*)sqlite3_column_text(statement, 1),
					sqlite3_column_int64(statement, 3),
					sqlite3_column_double(statement, 4),
					(const char*)sqlite3_column_text(statement, 5),
					(const char*)sqlite3_column_text(statement, 6),
					(const char*)sqlite3_column_text(statement, 7),
					sqlite3_column_int(statement, 8));
				if (keys)
				{
					message = JS_NewObject(context);
					JS_SetPropertyStr(context, message, "key", JS_NewString(context, (const char*)sqlite3_column_text(statement, 2)));
					JS_SetPropertyStr(context, message, "value", formatted);
					JS_SetPropertyStr(context, message, "timestamp", JS_NewString(context, (const char*)sqlite3_column_text(statement, 4)));
				}
				else
				{
					message = formatted;
				}
				tf_ssb_connection_rpc_send_json(connection, k_ssb_rpc_flag_stream, request_number, message, NULL, NULL, NULL);
				JS_FreeValue(context, message);
			}
		}
		sqlite3_finalize(statement);
	}
	tf_ssb_release_db_reader(ssb, db);

	if (max_sequence_seen == sequence + k_max - 1)
	{
		_tf_ssb_connection_send_history_stream(connection, request_number, author, max_sequence_seen + 1, keys, live);
	}
	else if (!live)
	{
		tf_ssb_connection_rpc_send(
			connection,
			k_ssb_rpc_flag_json,
			request_number,
			(const uint8_t*)"false",
			strlen("false"),
			NULL,
			NULL,
			NULL);
	}
}

static void _tf_ssb_connection_send_history_stream(tf_ssb_connection_t* connection, int32_t request_number, const char* author, int64_t sequence, bool keys, bool live)
{
	tf_ssb_connection_send_history_stream_t* async = tf_malloc(sizeof(tf_ssb_connection_send_history_stream_t));
	*async = (tf_ssb_connection_send_history_stream_t)
	{
		.request_number = request_number,
		.sequence = sequence,
		.keys = keys,
		.live = live,
	};
	snprintf(async->author, sizeof(async->author), "%s", author);
	tf_ssb_connection_schedule_idle(connection, _tf_ssb_connection_send_history_stream_callback, async);
}

static void _tf_ssb_rpc_createHistoryStream(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue arg_array = JS_GetPropertyStr(context, args, "args");
	JSValue arg = JS_GetPropertyUint32(context, arg_array, 0);
	if (JS_IsUndefined(arg))
	{
		tf_ssb_connection_rpc_send_error(connection, flags, -request_number, "Missing request.args in createHistoryStream.");
	}
	JSValue id = JS_GetPropertyStr(context, arg, "id");
	JSValue seq = JS_GetPropertyStr(context, arg, "seq");
	JSValue keys = JS_GetPropertyStr(context, arg, "keys");
	JSValue live = JS_GetPropertyStr(context, arg, "live");
	bool is_keys = JS_IsUndefined(keys) || JS_ToBool(context, keys) > 0;
	bool is_live = JS_ToBool(context, live) > 0;
	int64_t sequence = 0;
	JS_ToInt64(context, &sequence, seq);
	const char* author = JS_ToCString(context, id);

	_tf_ssb_connection_send_history_stream(connection, -request_number, author, sequence, is_keys, is_live);

	if (is_live)
	{
		tf_ssb_connection_add_new_message_request(connection, author, -request_number, is_keys);
	}

	JS_FreeCString(context, author);
	JS_FreeValue(context, id);
	JS_FreeValue(context, seq);
	JS_FreeValue(context, keys);
	JS_FreeValue(context, arg);
	JS_FreeValue(context, arg_array);
}

static void _tf_ssb_rpc_ebt_replicate_send_clock(tf_ssb_connection_t* connection, int32_t request_number, JSValue message)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue full_clock = JS_NewObject(context);

	/* Ask for every identity we know is being followed from local accounts. */
	const char** visible = tf_ssb_db_get_all_visible_identities(ssb, 2);
	for (int i = 0; visible[i]; i++)
	{
		int64_t sequence = 0;
		tf_ssb_db_get_latest_message_by_author(ssb, visible[i], &sequence, NULL, 0);
		JS_SetPropertyStr(context, full_clock, visible[i], JS_NewInt64(context, sequence == -1 ? -1 : (sequence << 1)));
	}
	tf_free(visible);

	/* Ask about the incoming connection, too. */
	char id[k_id_base64_len] = "";
	if (tf_ssb_connection_get_id(connection, id, sizeof(id)))
	{
		JSValue in_clock = JS_GetPropertyStr(context, full_clock, id);
		if (JS_IsUndefined(in_clock))
		{
			int64_t sequence = 0;
			tf_ssb_db_get_latest_message_by_author(ssb, id, &sequence, NULL, 0);
			JS_SetPropertyStr(context, full_clock, id, JS_NewInt64(context, sequence == -1 ? -1 : (sequence << 1)));
		}
		JS_FreeValue(context, in_clock);
	}

	/* Also respond with what we know about all requested identities. */
	if (!JS_IsUndefined(message))
	{
		JSPropertyEnum* ptab;
		uint32_t plen;
		JS_GetOwnPropertyNames(context, &ptab, &plen, message, JS_GPN_STRING_MASK);
		for (uint32_t i = 0; i < plen; ++i)
		{
			JSValue in_clock = JS_GetProperty(context, full_clock, ptab[i].atom);
			if (JS_IsUndefined(in_clock))
			{
				JSValue key = JS_AtomToString(context, ptab[i].atom);
				const char* key_string = JS_ToCString(context, key);
				if (key_string)
				{
					int64_t sequence = -1;
					tf_ssb_db_get_latest_message_by_author(ssb, key_string, &sequence, NULL, 0);
					JS_SetPropertyStr(context, full_clock, key_string, JS_NewInt64(context, sequence == -1 ? -1 : (sequence << 1)));
				}
				JS_FreeCString(context, key_string);
				JS_FreeValue(context, key);
			}
		}
		for (uint32_t i = 0; i < plen; ++i)
		{
			JS_FreeAtom(context, ptab[i].atom);
		}
		js_free(context, ptab);
	}

	tf_ssb_connection_rpc_send_json(connection, k_ssb_rpc_flag_stream, -request_number, full_clock, NULL, NULL, NULL);
	JS_FreeValue(context, full_clock);
}

static void _tf_ssb_rpc_ebt_replicate_send_messages(tf_ssb_connection_t* connection, JSValue message)
{
	if (JS_IsUndefined(message))
	{
		return;
	}

	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSPropertyEnum* ptab = NULL;
	uint32_t plen = 0;
	JS_GetOwnPropertyNames(context, &ptab, &plen, message, JS_GPN_STRING_MASK);
	for (uint32_t i = 0; i < plen; ++i)
	{
		JSValue in_clock = JS_GetProperty(context, message, ptab[i].atom);
		if (!JS_IsUndefined(in_clock))
		{
			JSValue key = JS_AtomToString(context, ptab[i].atom);
			int64_t sequence = -1;
			JS_ToInt64(context, &sequence, in_clock);
			const char* author = JS_ToCString(context, key);
			if (sequence >= 0 && (sequence & 1) == 0)
			{
				int32_t request_number = tf_ssb_connection_get_ebt_request_number(connection);
				_tf_ssb_connection_send_history_stream(connection, request_number, author, sequence >> 1, false, true);
				tf_ssb_connection_add_new_message_request(connection, author, request_number, false);
			}
			else
			{
				tf_ssb_connection_remove_new_message_request(connection, author);
			}
			JS_FreeCString(context, author);
			JS_FreeValue(context, key);
		}
		JS_FreeValue(context, in_clock);
	}
	for (uint32_t i = 0; i < plen; ++i)
	{
		JS_FreeAtom(context, ptab[i].atom);
	}
	js_free(context, ptab);
}

static void _tf_ssb_rpc_ebt_replicate(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	if (_is_error(context, args))
	{
		/* TODO: Send createHistoryStream. */
		return;
	}

	if (!tf_ssb_connection_get_ebt_request_number(connection))
	{
		tf_ssb_connection_set_ebt_request_number(connection, -request_number);
	}

	JSValue author = JS_GetPropertyStr(context, args, "author");
	JSValue name = JS_GetPropertyStr(context, args, "name");
	JSValue in_clock = JS_IsUndefined(name) ? args : JS_UNDEFINED;

	if (!JS_IsUndefined(author))
	{
		/* Looks like a message. */
		tf_ssb_verify_strip_and_store_message(ssb, args, NULL);
	}
	else
	{
		/* EBT clock. */
		tf_ssb_connection_set_ebt_send_clock(connection, args);
		if (!tf_ssb_connection_get_sent_clock(connection))
		{
			_tf_ssb_rpc_ebt_replicate_send_clock(connection, request_number, in_clock);
			tf_ssb_connection_set_sent_clock(connection, true);
		}
		_tf_ssb_rpc_ebt_replicate_send_messages(connection, in_clock);
	}
	JS_FreeValue(context, name);
	JS_FreeValue(context, author);
}

static void _tf_ssb_rpc_ebt_replicate_client(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	_tf_ssb_rpc_ebt_replicate(connection, flags, request_number, args, message, size, user_data);
}

static void _tf_ssb_rpc_send_ebt_replicate(tf_ssb_connection_t* connection)
{
	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue message = JS_NewObject(context);
	JSValue name = JS_NewArray(context);
	JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "ebt"));
	JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "replicate"));
	JS_SetPropertyStr(context, message, "name", name);
	JSValue arg = JS_NewObject(context);
	JS_SetPropertyStr(context, arg, "version", JS_NewInt32(context, 3));
	JS_SetPropertyStr(context, arg, "format", JS_NewString(context, "classic"));
	JSValue args = JS_NewArray(context);
	JS_SetPropertyUint32(context, args, 0, arg);
	JS_SetPropertyStr(context, message, "args", args);
	JS_SetPropertyStr(context, message, "type", JS_NewString(context, "duplex"));
	int32_t request_number = tf_ssb_connection_next_request_number(connection);
	tf_ssb_connection_rpc_send_json(
		connection,
		k_ssb_rpc_flag_stream,
		request_number,
		message,
		_tf_ssb_rpc_ebt_replicate_client,
		NULL,
		NULL);
	if (!tf_ssb_connection_get_ebt_request_number(connection))
	{
		tf_ssb_connection_set_ebt_request_number(connection, request_number);
	}
	JS_FreeValue(context, message);
}

static void _tf_ssb_rpc_ebt_replicate_server(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
{
	if (flags & k_ssb_rpc_flag_end_error)
	{
		return;
	}
	_tf_ssb_rpc_ebt_replicate(connection, flags, request_number, args, message, size, user_data);
	tf_ssb_connection_add_request(connection, -request_number, _tf_ssb_rpc_ebt_replicate, NULL, NULL, NULL);
}

static void _tf_ssb_rpc_connections_changed_callback(tf_ssb_t* ssb, tf_ssb_change_t change, tf_ssb_connection_t* connection, void* user_data)
{
	JSContext* context = tf_ssb_get_context(ssb);
	if (change == k_tf_ssb_change_connect)
	{
		JSValue message = JS_NewObject(context);
		JSValue name = JS_NewArray(context);
		JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "blobs"));
		JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "createWants"));
		JS_SetPropertyStr(context, message, "name", name);
		JS_SetPropertyStr(context, message, "type", JS_NewString(context, "source"));
		JS_SetPropertyStr(context, message, "args", JS_NewArray(context));
		tf_ssb_connection_rpc_send_json(
			connection,
			k_ssb_rpc_flag_stream,
			tf_ssb_connection_next_request_number(connection),
			message,
			_tf_ssb_rpc_connection_blobs_createWants_callback,
			NULL,
			NULL);
		JS_FreeValue(context, message);

		if (tf_ssb_connection_is_client(connection))
		{
			message = JS_NewObject(context);
			name = JS_NewArray(context);
			JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "tunnel"));
			JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "isRoom"));
			JS_SetPropertyStr(context, message, "name", name);
			JS_SetPropertyStr(context, message, "args", JS_NewArray(context));
			tf_ssb_connection_rpc_send_json(
				connection,
				0,
				tf_ssb_connection_next_request_number(connection),
				message,
				_tf_ssb_rpc_connection_tunnel_isRoom_callback,
				NULL,
				NULL);
			JS_FreeValue(context, message);

			_tf_ssb_rpc_send_ebt_replicate(connection);
		}
	}
	else if (change == k_tf_ssb_change_remove)
	{
		tf_ssb_remove_blob_want_added_callback(ssb, _tf_ssb_rpc_blob_wants_added_callback, connection);

		char id[k_id_base64_len] = "";
		if (tf_ssb_connection_get_id(connection, id, sizeof(id)))
		{
			JSValue left = JS_NewObject(context);
			JS_SetPropertyStr(context, left, "type", JS_NewString(context, "left"));
			JS_SetPropertyStr(context, left, "id", JS_NewString(context, id));
			tf_ssb_connection_t* connections[1024];
			int count = tf_ssb_get_connections(ssb, connections, _countof(connections));
			for (int i = 0; i < count; i++)
			{
				if (tf_ssb_connection_is_attendant(connections[i]))
				{
					tf_ssb_connection_rpc_send_json(
						connections[i],
						k_ssb_rpc_flag_stream,
						-tf_ssb_connection_get_attendant_request_number(connections[i]),
						left,
						NULL,
						NULL,
						NULL);
				}
			}
			JS_FreeValue(context, left);
		}
	}
}

void tf_ssb_rpc_register(tf_ssb_t* ssb)
{
	tf_ssb_add_connections_changed_callback(ssb, _tf_ssb_rpc_connections_changed_callback, NULL, NULL);
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "gossip", "ping", NULL }, _tf_ssb_rpc_gossip_ping, NULL, NULL); /* DUPLEX */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "blobs", "get", NULL }, _tf_ssb_rpc_blobs_get, NULL, NULL); /* SOURCE */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "blobs", "has", NULL }, _tf_ssb_rpc_blobs_has, NULL, NULL); /* ASYNC */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "blobs", "createWants", NULL }, _tf_ssb_rpc_blobs_createWants, NULL, NULL); /* SOURCE */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "tunnel", "connect", NULL }, _tf_ssb_rpc_tunnel_connect, NULL, NULL); /* DUPLEX */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "tunnel", "isRoom", NULL }, _tf_ssb_rpc_room_meta, NULL, NULL); /* FAKE-ASYNC */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "room", "metadata", NULL }, _tf_ssb_rpc_room_meta, NULL, NULL); /* ASYNC */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "room", "attendants", NULL }, _tf_ssb_rpc_room_attendants, NULL, NULL); /* SOURCE */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "createHistoryStream", NULL }, _tf_ssb_rpc_createHistoryStream, NULL, NULL); /* SOURCE */
	tf_ssb_add_rpc_callback(ssb, (const char*[]) { "ebt", "replicate", NULL }, _tf_ssb_rpc_ebt_replicate_server, NULL, NULL); /* DUPLEX */
}