/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*  Fluent Bit

 *  ==========

 *  Copyright (C) 2015-2026 The Fluent Bit Authors

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.

 *  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 *  Unless required by applicable law or agreed to in writing, software

 *  distributed under the License is distributed on an "AS IS" BASIS,

 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 *  See the License for the specific language governing permissions and

 *  limitations under the License.

 */

#include <fluent-bit/flb_input_plugin.h>

#include <fluent-bit/flb_network.h>

#include <fluent-bit/flb_config.h>

#include "splunk.h"

#include "splunk_prot.h"

#include "splunk_config.h"

static int in_splunk_init(struct flb_input_instance *ins,

                          struct flb_config *config, void *data)

{

    int ret;

    struct flb_splunk *ctx;

    struct flb_http_server_options http_server_options;

    (void) config;

    (void) data;

    /* Create context and basic conf */

    ctx = splunk_config_create(ins);

    if (!ctx) {

        return -1;

    }

    /* Populate context with config map defaults and incoming properties */

    ret = flb_input_config_map_set(ins, (void *) ctx);

    if (ret == -1) {

        flb_plg_error(ctx->ins, "configuration error");

        splunk_config_destroy(ctx);

        return -1;

    }

    /* Set the context */

    flb_input_set_context(ins, ctx);

    ret = flb_input_http_server_options_init(

            &http_server_options,

            ins,

            (FLB_HTTP_SERVER_FLAG_KEEPALIVE | FLB_HTTP_SERVER_FLAG_AUTO_INFLATE),

            splunk_prot_handle_ng,

            ctx);

    if (ret == 0) {

        if (http_server_options.workers > 1) {

            ret = flb_input_ingress_enable(ins);

        }

    }

    if (ret == 0) {

        ret = flb_http_server_init_with_options(&ctx->http_server,

                                                &http_server_options);

        if (ret == 0) {

            ret = flb_http_server_start(&ctx->http_server);

        }

        if (ret == 0 && ctx->http_server.downstream != NULL) {

            ret = flb_input_downstream_set(ctx->http_server.downstream, ins);

        }

    }

    if (ret != 0) {

        flb_plg_error(ctx->ins,

                      "could not start http server on %s:%u. Aborting",

                      ins->host.listen, ins->host.port);

        splunk_config_destroy(ctx);

        return -1;

    }

    flb_plg_info(ctx->ins, "listening on %s:%u with %i worker%s",

                 ins->host.listen,

                 ins->host.port,

                 ctx->http_server.workers,

                 ctx->http_server.workers == 1 ? "" : "s");

    return 0;

}

static int in_splunk_exit(void *data, struct flb_config *config)

{

    struct flb_splunk *ctx;

    (void) config;

    ctx = data;

    if (ctx != NULL) {

        splunk_config_destroy(ctx);

    }

    return 0;

}

/* Configuration properties map */

static struct flb_config_map config_map[] = {

    {

     FLB_CONFIG_MAP_SLIST_1, "success_header", NULL,

     FLB_CONFIG_MAP_MULT, FLB_TRUE, offsetof(struct flb_splunk, success_headers),

     "Add an HTTP header key/value pair on success. Multiple headers can be set"

    },

    {

     FLB_CONFIG_MAP_STR, "splunk_token", NULL,

     0, FLB_FALSE, 0,

     "Set valid Splunk HEC tokens for the requests"

    },

    {

     FLB_CONFIG_MAP_BOOL, "store_token_in_metadata", "true",

     0, FLB_TRUE, offsetof(struct flb_splunk, store_token_in_metadata),

     "Store Splunk HEC tokens in metadata. If set as false, they will be stored into records."

    },

    {

     FLB_CONFIG_MAP_STR, "splunk_token_key", "@splunk_token",

     0, FLB_TRUE, offsetof(struct flb_splunk, store_token_key),

     "Set a record key for storing Splunk HEC token for the request"

    },

    {

     FLB_CONFIG_MAP_STR, "tag_key", NULL,

     0, FLB_TRUE, offsetof(struct flb_splunk, tag_key),

     "Set a record key to specify the tag of the record"

    },

    {

     FLB_CONFIG_MAP_BOOL, "add_remote_addr", "false",

     0, FLB_TRUE, offsetof(struct flb_splunk, add_remote_addr),

     "Inject a remote address using the X-Forwarded-For header or connection address"

    },

    {

     FLB_CONFIG_MAP_STR, "remote_addr_key", "remote_addr",

     0, FLB_TRUE, offsetof(struct flb_splunk, remote_addr_key),

     "Set a record key for storing the remote address"

    },

    /* EOF */

    {0}

};

/* Plugin reference */

struct flb_input_plugin in_splunk_plugin = {

    .name         = "splunk",

    .description  = "Input plugin for Splunk HEC payloads",

    .cb_init      = in_splunk_init,

    .cb_pre_run   = NULL,

    .cb_collect   = NULL,

    .cb_flush_buf = NULL,

    .cb_pause     = NULL,

    .cb_resume    = NULL,

    .cb_exit      = in_splunk_exit,

    .config_map   = config_map,

    .flags        = FLB_INPUT_NET_SERVER | FLB_INPUT_HTTP_SERVER | FLB_IO_OPT_TLS

};