178 lines
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178 lines
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<title>mastodonpp: example04_post_with_attachment.cpp</title>
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<div id="projectname">mastodonpp
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 <span id="projectnumber">0.5.7</span>
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<div id="projectbrief">C++ wrapper for the Mastodon and Pleroma APIs.</div>
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<div class="header">
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<div class="title">example04_post_with_attachment.cpp</div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="fragment"><div class="line"><span class="comment">/* This file is part of mastodonpp.</span></div>
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<div class="line"><span class="comment"> * Copyright © 2020 tastytea <tastytea@tastytea.de></span></div>
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<div class="line"><span class="comment"> *</span></div>
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<div class="line"><span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><span class="comment"> * purpose with or without fee is hereby granted.</span></div>
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<div class="line"><span class="comment"> *</span></div>
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<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><span class="comment"> * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><span class="comment"> * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span></div>
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<div class="line"><span class="comment"> * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><span class="comment"> * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION</span></div>
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<div class="line"><span class="comment"> * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>
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<div class="line"><span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><span class="comment"> */</span></div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Post a status (/api/v1/status) with an attachment (/api/v1/media).</span></div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor">#if __has_include("mastodonpp.hpp"</span>)</div>
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<div class="line"><span class="preprocessor"># include "mastodonpp.hpp"</span> <span class="comment">// We're building mastodonpp.</span></div>
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<div class="line"><span class="preprocessor">#else</span></div>
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<div class="line"><span class="preprocessor"># include <mastodonpp/mastodonpp.hpp></span> <span class="comment">// We're building outside mastodonpp.</span></div>
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<div class="line"><span class="preprocessor">#endif</span></div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><span class="preprocessor">#include <string></span></div>
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<div class="line"><span class="preprocessor">#include <string_view></span></div>
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<div class="line"><span class="preprocessor">#include <vector></span></div>
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<div class="line"> </div>
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<div class="line"><span class="keyword">namespace </span>masto = <a class="code" href="namespacemastodonpp.html">mastodonpp</a>;</div>
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<div class="line"><span class="keyword">using</span> std::cerr;</div>
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<div class="line"><span class="keyword">using</span> std::cout;</div>
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<div class="line"><span class="keyword">using</span> std::endl;</div>
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<div class="line"><span class="keyword">using</span> std::string;</div>
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<div class="line"><span class="keyword">using</span> std::string_view;</div>
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<div class="line"><span class="keyword">using</span> std::to_string;</div>
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<div class="line"><span class="keyword">using</span> std::vector;</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
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<div class="line">{</div>
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<div class="line"> <span class="keyword">const</span> vector<string_view> args(argv, argv + argc);</div>
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<div class="line"> <span class="keywordflow">if</span> (args.size() <= 3)</div>
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<div class="line"> {</div>
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<div class="line"> cerr << <span class="stringliteral">"Usage: "</span> << args[0]</div>
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<div class="line"> << <span class="stringliteral">" <instance hostname> <access token> <file>\n"</span>;</div>
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<div class="line"> <span class="keywordflow">return</span> 1;</div>
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<div class="line"> }</div>
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<div class="line"> </div>
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<div class="line"> <span class="keywordflow">try</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Initialize an Instance and a Connection.</span></div>
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<div class="line"> masto::Instance instance{args[1], args[2]};</div>
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<div class="line"> masto::Connection connection{instance};</div>
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<div class="line"> <span class="keyword">const</span> string_view filename{args[3]};</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Create attachment.</span></div>
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<div class="line"> <span class="keyword">auto</span> answer{connection.post(masto::API::v1::media,</div>
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<div class="line"> {{<span class="stringliteral">"file"</span>, string(<span class="stringliteral">"@file:"</span>) += filename},</div>
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<div class="line"> {<span class="stringliteral">"description"</span>, <span class="stringliteral">"Test."</span>}})};</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Get the ID of the attachment.</span></div>
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<div class="line"> <span class="comment">// You normally would use a JSON parser, of course. I don't use one</span></div>
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<div class="line"> <span class="comment">// because I don't want to add a dependency just for an example.</span></div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> pos{answer.body.find(R<span class="stringliteral">"("id":")") + 6};</span></div>
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<div class="line"><span class="stringliteral"> </span><span class="keyword">const</span> <span class="keyword">auto</span> endpos{answer.body.find(R<span class="stringliteral">"(",)", pos)};</span></div>
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<div class="line"><span class="stringliteral"> </span><span class="keyword">const</span> <span class="keyword">auto</span> media_id{answer.body.substr(pos, endpos - pos)};</div>
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<div class="line"> cout << <span class="stringliteral">"Attachment has ID: "</span> << media_id << endl;</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Post the status. Note that “media_ids” always has to be a vector.</span></div>
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<div class="line"> answer = connection.post(masto::API::v1::statuses,</div>
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<div class="line"> {{<span class="stringliteral">"status"</span>, <span class="stringliteral">"Attachment test."</span>},</div>
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<div class="line"> {<span class="stringliteral">"media_ids"</span>,</div>
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<div class="line"> vector<string_view>{media_id}}});</div>
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<div class="line"> <span class="keywordflow">if</span> (answer)</div>
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<div class="line"> {</div>
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<div class="line"> cout << <span class="stringliteral">"Successfully posted "</span> << filename << <span class="stringliteral">".\n"</span>;</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">else</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="keywordflow">if</span> (answer.curl_error_code == 0)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// If it is no libcurl error, it must be an HTTP error.</span></div>
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<div class="line"> cerr << <span class="stringliteral">"HTTP status: "</span> << answer.http_status << endl;</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">else</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Network errors like “Couldn't resolve host.”.</span></div>
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<div class="line"> cerr << <span class="stringliteral">"libcurl error "</span> << to_string(answer.curl_error_code)</div>
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<div class="line"> << <span class="stringliteral">": "</span> << answer.error_message << endl;</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> masto::CURLException &e)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Only libcurl errors that are not network errors will be thrown.</span></div>
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<div class="line"> <span class="comment">// There went probably something wrong with the initialization.</span></div>
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<div class="line"> cerr << e.what() << endl;</div>
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<div class="line"> }</div>
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<div class="line"> </div>
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<div class="line"> <span class="keywordflow">return</span> 0;</div>
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<div class="line">}</div>
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<div class="ttc" id="anamespacemastodonpp_html"><div class="ttname"><a href="namespacemastodonpp.html">mastodonpp</a></div><div class="ttdoc">C++ wrapper for the Mastodon API.</div><div class="ttdef"><b>Definition:</b> api.hpp:25</div></div>
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