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

/*  Fluent Bit

 *  ==========

 *  Copyright (C) 2015-2022 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 <stdlib.h>

#include <monkey/mk_core.h>

#include <fluent-bit/flb_info.h>

#include <fluent-bit/flb_mem.h>

#include <fluent-bit/flb_str.h>

#include <fluent-bit/flb_uri.h>

#include <fluent-bit/flb_utils.h>

/*

 * Perform URI encoding for the given string. Always returns a new sds buffer,

 * if it fails it returns NULL.

 */

flb_sds_t flb_uri_encode(const char *uri, size_t len)

{

    int i;

    flb_sds_t buf = NULL;

    flb_sds_t tmp = NULL;

    buf = flb_sds_create_size(len * 2);

    if (!buf) {

        flb_error("[uri] cannot allocate buffer for URI encoding");

        return NULL;

    }

    for (i = 0; i < len; i++) {

        if (flb_uri_to_encode(uri[i]) == FLB_TRUE) {

            tmp = flb_sds_printf(&buf, "%%%02X", (unsigned char) *(uri + i));

            if (!tmp) {

                flb_error("[uri] error formatting special character");

                flb_sds_destroy(buf);

                return NULL;

            }

            continue;

        }

        /* Direct assignment, just copy the character */

        if (buf) {

            tmp = flb_sds_cat(buf, uri + i, 1);

            if (!tmp) {

                flb_error("[uri] error composing outgoing buffer");

                flb_sds_destroy(buf);

                return NULL;

            }

            buf = tmp;

        }

    }

    return buf;

}

/* Retrieve a given field based on it expected position in the URI */

struct flb_uri_field *flb_uri_get(struct flb_uri *uri, int pos)

{

    if (pos >= FLB_URI_MAX || pos > uri->count) {

        flb_trace("[uri] requested position > FLB_URI_MAX");

        return NULL;

    }

    return &uri->map[pos];

}

/*

 * Given a 'URI' string, split the strings separated by a slash and create a

 * context.

 */

struct flb_uri *flb_uri_create(const char *full_uri)

{

    int end;

    unsigned int len;

    unsigned int val_len;

    unsigned int i = 0;

    char *val;

    size_t uri_size;

    void *p;

    struct flb_uri_field *field;

    struct flb_uri *uri;

    /* Set the required memory space */

    uri_size  = sizeof(struct flb_uri);

    uri_size += (sizeof(struct flb_uri_field) * FLB_URI_MAX);

    p  = flb_calloc(1, uri_size);

    if (!p) {

        perror("malloc");

        return NULL;

    }

    /* Link the 'map' */

    uri = p;

    p = ((char *) p) + sizeof(struct flb_uri);

    uri->map = p;

    /* Initialize fields list */

    mk_list_init(&uri->list);

    uri->count = 0;

    len = strlen(full_uri);

    while (i < len && uri->count < FLB_URI_MAX) {

        end = mk_string_char_search(full_uri + i, '/', len - i);

        if (end >= 0 && end + i < len) {

            end += i;

            if (i == (unsigned int) end) {

                i++;

                continue;

            }

            val = mk_string_copy_substr(full_uri, i, end);

            val_len = end - i;

        }

        else {

            val = mk_string_copy_substr(full_uri, i, len);

            val_len = len - i;

            end = len;

        }

        /* Alloc node */

        field = &uri->map[uri->count];

        field->value         = flb_strdup(val);

        field->length        = val_len;

        mk_list_add(&field->_head, &uri->list);

        i = end + 1;

        uri->count++;

        mk_mem_free(val);

    }

    uri->full = flb_strdup(full_uri);

    return uri;

}

/* Destroy an URI context and it resources associated */

void flb_uri_destroy(struct flb_uri *uri)

{

    struct mk_list *tmp;

    struct mk_list *head;

    struct flb_uri_field *field;

    mk_list_foreach_safe(head, tmp, &uri->list) {

        field = mk_list_entry(head, struct flb_uri_field, _head);

        mk_list_del(&field->_head);

        flb_free(field->value);

    }

    flb_free(uri->full);

    flb_free(uri);

}

void flb_uri_dump(struct flb_uri *uri)

{

    int i;

    struct flb_uri_field *f;

    for (i = 0; i < uri->count; i++) {

        f = &uri->map[i];

        printf("[%i] length=%lu value='%s'\n",

               i, f->length, f->value);

    }

}