mirror of
https://gitlab.com/gnuwget/wget2.git
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122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* Copyright(c) 2016-2018 Free Software Foundation, Inc.
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*
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* This file is part of libwget.
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*
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* Libwget is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Libwget is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libwget. If not, see <https://www.gnu.org/licenses/>.
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*
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*
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* Demo how to create a diagram from a text using www.websequencediagrams.com
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* Using low-level API.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wget.h>
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int main(int argc G_GNUC_WGET_UNUSED, const char *const *argv G_GNUC_WGET_UNUSED)
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{
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wget_http_connection_t *conn = NULL;
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wget_http_request_t *req;
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wget_http_response_t *resp;
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wget_iri_t *iri;
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// set up libwget global configuration
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wget_global_init(
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// WGET_DEBUG_STREAM, stderr,
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WGET_ERROR_STREAM, stderr,
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WGET_INFO_STREAM, stdout,
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0);
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// This is the text that we want to convert into a GFX
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const char *text = "alice->bob: authentication request\nbob-->alice: response";
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const char *style = "qsd";
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wget_buffer_t *url = wget_buffer_alloc(128);
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wget_buffer_t *body = wget_buffer_alloc(128);
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wget_buffer_strcpy(body, "message=");
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wget_iri_escape_query(text, body);
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wget_buffer_printf_append(body, "&style=%s&apiVersion=1", style);
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iri = wget_iri_parse("https://www.websequencediagrams.com", NULL);
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req = wget_http_create_request(iri, "POST");
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wget_http_add_header(req, "Connection", "keepalive");
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wget_http_request_set_body(req, "application/x-www-form-urlencoded", wget_memdup(body->data, body->length), body->length);
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wget_http_open(&conn, iri);
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if (conn) {
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if (wget_http_send_request(conn, req))
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goto out;
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resp = wget_http_get_response(conn);
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if (!resp)
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goto out;
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// wget_info_printf("answer=%s\n", resp->body->data);
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// extract image URL using a hack. Using a JSON parser would be correct.
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const char *p, *e;
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if (!(p = strstr(resp->body->data, "\"img\": \"")))
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goto out;
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if (!(e = strchr(p + 8, '\"')))
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goto out;
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p += 8;
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wget_buffer_printf(url, "https://www.websequencediagrams.com/%.*s", (int) (e - p), p);
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wget_http_free_response(&resp);
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wget_http_free_request(&req);
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wget_iri_free(&iri);
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iri = wget_iri_parse(url->data, NULL);
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req = wget_http_create_request(iri, "GET");
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wget_http_add_header(req, "Accept-Encoding", "gzip");
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if (wget_http_send_request(conn, req))
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goto out;
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resp = wget_http_get_response(conn);
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if (!resp)
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goto out;
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FILE *fp;
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if ((fp = fopen("out.png", "wb"))) {
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fwrite(resp->body->data, 1, resp->body->length, fp);
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fclose(fp);
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wget_info_printf("Saved out.png\n");
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}
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}
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out:
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// The following cleanup code is just for demonstration and not needed before return/exit from an application
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wget_http_free_response(&resp);
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wget_http_free_request(&req);
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wget_http_close(&conn);
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wget_iri_free(&iri);
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wget_buffer_free(&body);
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wget_buffer_free(&url);
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// free resources - needed for valgrind testing
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wget_global_deinit();
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return 0;
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}
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