mastodonpp/examples/example04_post_with_attachment.cpp

100 lines
3.5 KiB
C++

/* This file is part of mastodonpp.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// Post a status (/api/v1/status) with an attachment (/api/v1/media).
#include "mastodonpp.hpp"
#include <iostream>
#include <string>
#include <string_view>
#include <vector>
namespace masto = mastodonpp;
using std::cout;
using std::cerr;
using std::endl;
using std::string;
using std::to_string;
using std::string_view;
using std::vector;
int main(int argc, char *argv[])
{
const vector<string_view> args(argv, argv + argc);
if (args.size() <= 3)
{
cerr << "Usage: " << args[0] << " <instance hostname> <access token> <file>\n";
return 1;
}
try
{
// Initialize an Instance and a Connection.
masto::Instance instance{args[1], args[2]};
masto::Connection connection{instance};
const string_view filename{args[3]};
// Create attachment.
auto answer{connection.post(masto::API::v1::media,
{
{"file", string("@file:") += filename},
{"description", "Test."}
})};
// Get the ID of the attachment.
// You normally would use a JSON parser, of course. I don't use one
// because I don't want to add a dependency just for an example.
const auto pos{answer.body.find(R"("id":")") + 6};
const auto endpos{answer.body.find(R"(",)", pos)};
const auto media_id{answer.body.substr(pos, endpos - pos)};
cout << "Attachment has ID: " << media_id << endl;
// Post the status. Note that “media_ids” always has to be a vector.
answer = connection.post(masto::API::v1::statuses,
{
{"status", "Attachment test."},
{"media_ids",
vector<string_view>{media_id}}
});
if (answer)
{
cout << "Successfully posted " << filename << ".\n";
}
else
{
if (answer.curl_error_code == 0)
{
// If it is no libcurl error, it must be an HTTP error.
cerr << "HTTP status: " << answer.http_status << endl;
}
else
{
// Network errors like “Couldn't resolve host.”.
cerr << "libcurl error " << to_string(answer.curl_error_code)
<< ": " << answer.error_message << endl;
}
}
}
catch (const masto::CURLException &e)
{
// Only libcurl errors that are not network errors will be thrown.
// There went probably something wrong with the initialization.
cerr << e.what() << endl;
}
return 0;
}