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#include "mcp/tools/common/registry.h"
#include "mcp/tools/common/common.h"
#include "mcp/tools/common/context.h"
#include "mjson.h"
#include <stdlib.h>
#include <string.h>
#include "base/allocator.h"
static bool
metadata_has_only_known_fields(const char *json, int length)
{
int offset = 0, key_offset, key_length, value_offset, value_length, value_type;
while ((offset = mjson_next(json,
length,
offset,
&key_offset,
&key_length,
&value_offset,
&value_length,
&value_type))
!= 0)
{
char key[32];
int decoded = mjson_get_string(json + key_offset, key_length, "$", key, sizeof(key));
(void)value_offset;
(void)value_length;
(void)value_type;
if (decoded <= 0 || decoded >= (int)sizeof(key))
{
return false;
}
key[decoded] = '\0';
if (strcmp(key, "tool_call_id") != 0 && strcmp(key, "tags") != 0
&& strcmp(key, "memory_tier") != 0)
{
return false;
}
}
return true;
}
static bool
parse_metadata(const char *json, tiny_message_t *message)
{
const char *tool_call = NULL, *tier = NULL, *tags = NULL;
int tool_call_len = 0, tier_len = 0, tags_len = 0;
int offset = 0, key_offset, key_length, value_offset, value_length, value_type;
int length = (int)strlen(json);
int tool_call_type, tier_type, tags_type;
if (strcmp(json, "{}") == 0)
{
return true;
}
if (mjson_find(json, length, "$", NULL, NULL) != MJSON_TOK_OBJECT
|| !metadata_has_only_known_fields(json, length))
{
return false;
}
tool_call_type = mjson_find(json, length, "$.tool_call_id", &tool_call, &tool_call_len);
tier_type = mjson_find(json, length, "$.memory_tier", &tier, &tier_len);
tags_type = mjson_find(json, length, "$.tags", &tags, &tags_len);
if ((tool_call_type != MJSON_TOK_INVALID && tool_call_type != MJSON_TOK_STRING)
|| (tier_type != MJSON_TOK_INVALID && tier_type != MJSON_TOK_STRING)
|| (tags_type != MJSON_TOK_INVALID && tags_type != MJSON_TOK_ARRAY))
{
return false;
}
if (tool_call_type == MJSON_TOK_STRING)
{
int decoded;
message->metadata.tool_call_id = malloc(TINY_TOOL_CALL_ID_MAX + 1);
if (!message->metadata.tool_call_id)
{
return false;
}
decoded = mjson_get_string(json,
length,
"$.tool_call_id",
message->metadata.tool_call_id,
TINY_TOOL_CALL_ID_MAX + 1);
if (decoded < 0 || decoded > TINY_TOOL_CALL_ID_MAX
|| !tiny_utf8_valid(message->metadata.tool_call_id, (size_t)decoded))
{
return false;
}
message->metadata.tool_call_id[decoded] = '\0';
}
if (tier_type == MJSON_TOK_STRING)
{
char tier_value[16];
int decoded = mjson_get_string(json, length, "$.memory_tier", tier_value, sizeof(tier_value));
if (decoded < 0 || decoded >= (int)sizeof(tier_value))
{
return false;
}
tier_value[decoded] = '\0';
if (!tiny_tier_parse(tier_value, &message->metadata.memory_tier))
{
return false;
}
}
if (tags_type == MJSON_TOK_ARRAY)
{
while ((offset = mjson_next(tags,
tags_len,
offset,
&key_offset,
&key_length,
&value_offset,
&value_length,
&value_type))
!= 0)
{
char *tag;
char **resized;
int decoded;
if (value_type != MJSON_TOK_STRING || message->metadata.tag_count >= TINY_TAG_COUNT_MAX)
{
return false;
}
tag = malloc(TINY_TAG_MAX + 1);
if (!tag)
{
return false;
}
decoded = mjson_get_string(tags + value_offset, value_length, "$", tag, TINY_TAG_MAX + 1);
if (decoded <= 0 || decoded > TINY_TAG_MAX || !tiny_utf8_valid(tag, (size_t)decoded))
{
free(tag);
return false;
}
tag[decoded] = '\0';
resized = realloc(message->metadata.tags,
(message->metadata.tag_count + 1) * sizeof(*message->metadata.tags));
if (!resized)
{
free(tag);
return false;
}
message->metadata.tags = resized;
message->metadata.tags[message->metadata.tag_count++] = tag;
}
}
return true;
}
static void
call_write_message(const mcpc_tool_t *tool, mcpc_ucbr_t *result)
{
tiny_mcp_tools_context_t *context = tiny_mcp_tools_context_current();
tiny_message_t input, written;
tiny_store_status_t status;
char *role = NULL, *metadata = NULL;
tiny_json_buffer_t json;
tiny_message_init(&input);
tiny_message_init(&written);
input.session_id = tiny_mcp_tool_get_string(tool, "session_id", TINY_SESSION_ID_MAX);
role = tiny_mcp_tool_get_string(tool, "role", 16);
input.content = tiny_mcp_tool_get_string(tool, "content", TINY_CONTENT_MAX);
metadata = tiny_mcp_tool_get_string(tool, "metadata_json", TINY_CONTENT_MAX);
bool valid = context && input.session_id && input.session_id[0] && role && input.content
&& input.content[0] && metadata && tiny_role_parse(role, &input.role)
&& parse_metadata(metadata, &input);
if (!valid)
{
tiny_mcp_tool_add_error(result, "VALIDATION_ERROR", "invalid write_message arguments");
}
else
{
status = tiny_store_write(context->store, &input, &written);
if (status != TINY_STORE_OK)
{
tiny_mcp_tool_add_error(
result, tiny_store_status_name(status), "message was not written");
}
else
{
if (context->search_index
&& !tiny_search_index_add(
context->search_index, &written, tiny_store_entry_count(context->store) - 1))
{
tiny_search_index_free(context->search_index);
context->search_index = NULL;
}
tiny_json_init(&json);
tiny_json_raw(&json, "{\"status\":\"OK\",\"message\":");
tiny_mcp_tool_append_message(&json, &written);
tiny_json_raw(&json, "}");
tiny_mcp_tool_add_json(result, &json);
tiny_json_free(&json);
}
}
free(role);
free(metadata);
tiny_message_free(&input);
tiny_message_free(&written);
}
bool
tiny_mcp_register_write_message(mcpc_server_t *server)
{
mcpc_tool_t *tool
= tiny_mcp_tool_new("write_message", "Append a conversation message", call_write_message);
return tool && tiny_mcp_tool_add_property(tool, "session_id", "Session ID", MCPC_U8STR)
&& tiny_mcp_tool_add_property(tool, "role", "user, assistant, or system", MCPC_U8STR)
&& tiny_mcp_tool_add_property(tool, "content", "Message text", MCPC_U8STR)
&& tiny_mcp_tool_add_property(
tool, "metadata_json", "Metadata object JSON; use {} when empty", MCPC_U8STR)
&& mcpc_server_add_tool(server, tool) == MCPC_EC_0;
}
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