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/*
* Copyright (c) 2016-2024 Free Software Foundation, Inc.
*
* This file is part of libwget.
*
* Libwget is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Libwget is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libwget. If not, see <https://www.gnu.org/licenses/>.
*
*
* Demo how to create a diagram from a text using www.websequencediagrams.com
* Using low-level API.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wget.h>
int main(int argc WGET_GCC_UNUSED, const char *const *argv WGET_GCC_UNUSED)
{
wget_http_connection *conn = NULL;
wget_http_request *req;
wget_http_response *resp;
wget_iri *iri;
// set up libwget global configuration
wget_global_init(
// WGET_DEBUG_STREAM, stderr,
WGET_ERROR_STREAM, stderr,
WGET_INFO_STREAM, stdout,
0);
// This is the text that we want to convert into a GFX
const char *text = "alice->bob: authentication request\nbob-->alice: response";
const char *style = "qsd";
wget_buffer *url = wget_buffer_alloc(128);
wget_buffer *body = wget_buffer_alloc(128);
wget_buffer_strcpy(body, "message=");
wget_iri_escape_query(text, body);
wget_buffer_printf_append(body, "&style=%s&apiVersion=1", style);
iri = wget_iri_parse("https://www.websequencediagrams.com", NULL);
req = wget_http_create_request(iri, "POST");
wget_http_add_header(req, "Connection", "keepalive");
wget_http_request_set_body(req, "application/x-www-form-urlencoded", wget_memdup(body->data, body->length), body->length);
wget_http_open(&conn, iri);
if (conn) {
if (wget_http_send_request(conn, req))
goto out;
resp = wget_http_get_response(conn);
if (!resp)
goto out;
// wget_info_printf("answer=%s\n", resp->body->data);
// extract image URL using a hack. Using a JSON parser would be correct.
const char *p, *e;
if (!(p = strstr(resp->body->data, "\"img\": \"")))
goto out;
if (!(e = strchr(p + 8, '\"')))
goto out;
p += 8;
wget_buffer_printf(url, "https://www.websequencediagrams.com/%.*s", (int) (e - p), p);
wget_http_free_response(&resp);
wget_http_free_request(&req);
wget_iri_free(&iri);
iri = wget_iri_parse(url->data, NULL);
req = wget_http_create_request(iri, "GET");
wget_http_add_header(req, "Accept-Encoding", "gzip");
if (wget_http_send_request(conn, req))
goto out;
resp = wget_http_get_response(conn);
if (!resp)
goto out;
FILE *fp;
if ((fp = fopen("out.png", "wb"))) {
fwrite(resp->body->data, 1, resp->body->length, fp);
fclose(fp);
wget_info_printf("Saved out.png\n");
}
}
out:
// The following cleanup code is just for demonstration and not needed before return/exit from an application
wget_http_free_response(&resp);
wget_http_free_request(&req);
wget_http_close(&conn);
wget_iri_free(&iri);
wget_buffer_free(&body);
wget_buffer_free(&url);
// free resources - needed for valgrind testing
wget_global_deinit();
return 0;
}
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