522 lines
21 KiB
C++
522 lines
21 KiB
C++
#include <memory>
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#include <exception>
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#include <stdexcept>
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#include <FastHash.h>
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#include <curl/curl.h>
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#include "font_awesome.h"
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#include "config.h"
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#include "settings.h"
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#include "models.h"
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#include "timeutils.h"
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#include "servehelper.h"
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#include "lxb_wrapper.h"
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#include "curlu_wrapper.h"
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#include "routes/routes.h"
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#include "blankie/escape.h"
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static inline void preprocess_html(const httplib::Request& req, const std::string& domain_name, const std::vector<Emoji>& emojis, lxb_dom_element_t* element);
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static inline void preprocess_link(const httplib::Request& req, const std::string& domain_name, lxb_dom_element_t* element);
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static inline bool should_fix_link(lxb_dom_element_t* element, const std::string& element_cls);
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static inline lxb_dom_node_t* emojify(lxb_dom_node_t* child, const std::vector<Emoji>& emojis);
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static inline std::vector<lxb_dom_node*> emojify(lxb_dom_document_t* document, std::string str, const std::vector<Emoji>& emojis);
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struct PostStatus {
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const char* icon_html;
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Node info_node;
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};
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static Element serialize_post(const httplib::Request& req, const std::string& server, const Post& post, bool main_post, const std::optional<PostStatus>& post_status);
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static inline Element serialize_media(const Media& media);
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static inline Element serialize_poll(const httplib::Request& req, const Poll& poll);
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void serve(const httplib::Request& req, httplib::Response& res, std::string title, Element element, Nodes extra_head) {
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using namespace std::string_literals;
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std::string css_url = get_origin(req) + "/style.css";
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res.set_header("Content-Security-Policy", "default-src 'none'; img-src https:; media-src https:; style-src "s + css_url);
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Element head("head", {
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Element("meta", {{"charset", "utf-8"}}, {}),
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Element("title", {std::move(title)}),
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Element("link", {{"rel", "stylesheet"}, {"href", std::move(css_url) + "?v=" + std::to_string(css_hash)}}, {}),
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Element("meta", {{"name", "viewport"}, {"content", "width=device-width,initial-scale=1"}}, {})
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});
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head.nodes.reserve(head.nodes.size() + extra_head.size());
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head.nodes.insert(head.nodes.end(), extra_head.begin(), extra_head.end());
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std::string html = "<!DOCTYPE html>"s + Element("html", {
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std::move(head),
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std::move(element)
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}).serialize();
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uint64_t hash = FastHash(html.data(), html.size(), 0);
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res.set_header("ETag", std::string(1, '"') + std::to_string(hash) + '"');
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if (should_send_304(req, hash)) {
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res.status = 304;
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res.set_header("Content-Length", std::to_string(html.size()));
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res.set_header("Content-Type", "text/html");
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} else {
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res.set_content(std::move(html), "text/html");
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}
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}
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void serve_error(const httplib::Request& req, httplib::Response& res,
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std::string title, std::optional<std::string> subtitle, std::optional<std::string> info) {
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Element error_div("div", {{"class", "error"}}, {
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Element("h2", {title})
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});
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if (subtitle) {
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error_div.nodes.push_back(Element("p", {
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std::move(*subtitle)
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}));
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}
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if (info) {
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error_div.nodes.push_back(Element("pre", {
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Element("code", {std::move(*info)})
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}));
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}
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Element body("body", {std::move(error_div)});
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serve(req, res, std::move(title), std::move(body));
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}
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void serve_redirect(const httplib::Request& req, httplib::Response& res, std::string url, bool permanent) {
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using namespace std::string_literals;
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Element body("body", {
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"Redirecting to ",
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Element("a", {{"href", url}}, {url}),
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"…"
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});
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res.set_redirect(url, permanent ? 301 : 302);
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serve(req, res, "Redirecting to "s + std::move(url) + "…", std::move(body));
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}
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bool starts_with(const CurlUrl& url, const CurlUrl& base) {
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if (strcmp(url.get(CURLUPART_SCHEME).get(), base.get(CURLUPART_SCHEME).get()) != 0) {
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return false;
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}
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if (strcmp(url.get(CURLUPART_HOST).get(), base.get(CURLUPART_HOST).get()) != 0) {
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return false;
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}
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CurlStr url_path = url.get(CURLUPART_PATH);
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CurlStr base_path = base.get(CURLUPART_PATH);
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size_t base_path_len = strlen(base_path.get());
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return memcmp(url_path.get(), base_path.get(), base_path_len) == 0
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&& (base_path.get()[base_path_len - 1] == '/' || url_path.get()[base_path_len] == '/' || url_path.get()[base_path_len] == '\0');
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}
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std::string get_origin(const httplib::Request& req) {
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if (req.has_header("X-Canonical-Origin")) {
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return req.get_header_value("X-Canonical-Origin");
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}
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if (config.canonical_origin) {
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return *config.canonical_origin;
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}
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std::string origin = "http://";
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if (req.has_header("Host")) {
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origin += req.get_header_value("Host");
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} else {
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origin += config.bind_host;
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if (config.bind_port != 80) {
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origin += ':' + std::to_string(config.bind_port);
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}
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}
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return origin;
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}
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std::string proxy_mastodon_url(const httplib::Request& req, const std::string& url_str) {
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CurlUrl url;
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url.set(CURLUPART_URL, url_str.c_str());
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std::string new_url = get_origin(req) + '/' + url.get(CURLUPART_HOST).get() + url.get(CURLUPART_PATH).get();
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try {
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CurlStr query = url.get(CURLUPART_QUERY);
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new_url += '?';
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new_url += query.get();
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} catch (const CurlUrlException& e) {
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if (e.code != CURLUE_NO_QUERY) {
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throw;
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}
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}
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try {
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CurlStr fragment = url.get(CURLUPART_FRAGMENT);
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new_url += '#';
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new_url += fragment.get();
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} catch (const CurlUrlException& e) {
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if (e.code != CURLUE_NO_FRAGMENT) {
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throw;
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}
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}
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return new_url;
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}
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bool should_send_304(const httplib::Request& req, uint64_t hash) {
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std::string header = req.get_header_value("If-None-Match");
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if (header == "*") {
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return true;
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}
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size_t pos = header.find(std::string(1, '"') + std::to_string(hash) + '"');
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return pos != std::string::npos && (pos == 0 || header[pos - 1] != '/');
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}
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Element serialize_post(const httplib::Request& req, const std::string& server, const Post& post, bool pinned, bool main_post) {
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using namespace std::string_literals;
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if (post.reblog) {
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PostStatus post_status = {
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fa_retweet,
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preprocess_html(req, post.account.emojis, post.account.display_name + " boosted"),
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};
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return serialize_post(req, server, *post.reblog, main_post, post_status);
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} else if (pinned) {
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PostStatus post_status = {
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fa_thumbtack,
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blankie::html::HTMLString("Pinned post"),
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};
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return serialize_post(req, server, post, main_post, post_status);
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} else if (post.in_reply_to_id && post.in_reply_to_account_id && post.account.id == *post.in_reply_to_account_id) {
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PostStatus post_status = {
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fa_reply,
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preprocess_html(req, post.account.emojis, "Replied to "s + post.account.display_name),
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};
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return serialize_post(req, server, post, main_post, post_status);
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} else {
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return serialize_post(req, server, post, main_post, std::nullopt);
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}
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}
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blankie::html::HTMLString preprocess_html(const httplib::Request& req, const std::string& domain_name, const std::vector<Emoji>& emojis, const blankie::html::HTMLString& str) {
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LXB::HTML::Document document(str.str);
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preprocess_html(req, domain_name, emojis, document.body_element());
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return blankie::html::HTMLString(document.serialize());
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}
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blankie::html::HTMLString preprocess_html(const httplib::Request& req, const std::vector<Emoji>& emojis, const std::string& str) {
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return preprocess_html(req, "", emojis, blankie::html::HTMLString(blankie::html::escape(str)));
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}
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static inline void preprocess_html(const httplib::Request& req, const std::string& domain_name, const std::vector<Emoji>& emojis, lxb_dom_element_t* element) {
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const char* tag_name = reinterpret_cast<const char*>(lxb_dom_element_tag_name(element, nullptr));
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if (strncmp(tag_name, "A", 2) == 0) {
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// Proprocess links
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preprocess_link(req, domain_name, element);
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}
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// Walk through the element's children
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lxb_dom_node_t* child = lxb_dom_node_first_child(lxb_dom_interface_node(element));
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while (child) {
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if (child->type == LXB_DOM_NODE_TYPE_ELEMENT) {
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preprocess_html(req, domain_name, emojis, lxb_dom_interface_element(child));
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} else if (child->type == LXB_DOM_NODE_TYPE_TEXT) {
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child = emojify(child, emojis);
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}
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child = lxb_dom_node_next(child);
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}
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}
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static std::regex mention_class_re("\\bmention\\b");
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static inline void preprocess_link(const httplib::Request& req, const std::string& domain_name, lxb_dom_element_t* element) {
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using namespace std::string_literals;
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size_t href_c_len;
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const lxb_char_t* href_c = lxb_dom_element_get_attribute(element, reinterpret_cast<const lxb_char_t*>("href"), 4, &href_c_len);
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if (!href_c) {
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return;
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}
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std::string href(reinterpret_cast<const char*>(href_c), href_c_len);
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size_t cls_c_len;
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const lxb_char_t* cls_c = lxb_dom_element_class(element, &cls_c_len);
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std::string cls = cls_c ? std::string(reinterpret_cast<const char*>(cls_c), cls_c_len) : "";
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try {
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CurlUrl href_url;
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href_url.set(CURLUPART_URL, get_origin(req));
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href_url.set(CURLUPART_PATH, std::string(href_url.get(CURLUPART_PATH).get()) + req.path);
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href_url.set(CURLUPART_URL, href);
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CurlUrl instance_url_base;
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instance_url_base.set(CURLUPART_SCHEME, "https");
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instance_url_base.set(CURLUPART_HOST, domain_name);
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// .mention is used in note and posts
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// Instance base is used for link fields
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if (std::regex_search(cls, mention_class_re) || starts_with(href_url, instance_url_base)) {
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// Proxy this instance's URLs to Coyote
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href = proxy_mastodon_url(req, std::move(href));
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lxb_dom_element_set_attribute(element, reinterpret_cast<const lxb_char_t*>("href"), 4, reinterpret_cast<const lxb_char_t*>(href.data()), href.size());
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}
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} catch (const CurlUrlException& e) {
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// example: <a href=""></a> on eldritch.cafe/about
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if (e.code != CURLUE_MALFORMED_INPUT) {
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throw;
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}
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}
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if (should_fix_link(element, cls)) {
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// Set the content of each <a> to its href
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lxb_status_t status = lxb_dom_node_text_content_set(lxb_dom_interface_node(element), reinterpret_cast<const lxb_char_t*>(href.data()), href.size());
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if (status != LXB_STATUS_OK) {
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throw LXB::Exception(status);
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}
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}
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}
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static std::regex unhandled_link_re("\\bunhandled-link\\b");
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static inline bool should_fix_link(lxb_dom_element_t* element, const std::string& element_cls) {
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// https://vt.social/@LucydiaLuminous/111448085044245037
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if (std::regex_search(element_cls, unhandled_link_re)) {
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return true;
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}
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auto expected_element = [](lxb_dom_node_t* node, const char* expected_cls) {
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if (!node || node->type != LXB_DOM_NODE_TYPE_ELEMENT) {
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return false;
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}
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lxb_dom_element_t* span = lxb_dom_interface_element(node);
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const char* tag_name = reinterpret_cast<const char*>(lxb_dom_element_tag_name(span, nullptr));
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if (strncmp(tag_name, "SPAN", 5) != 0) {
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return false;
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}
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const lxb_char_t* cls = lxb_dom_element_get_attribute(span, reinterpret_cast<const lxb_char_t*>("class"), 5, nullptr);
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return cls && strcmp(reinterpret_cast<const char*>(cls), expected_cls) == 0;
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};
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lxb_dom_node_t* child = lxb_dom_node_first_child(lxb_dom_interface_node(element));
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if (!expected_element(child, "invisible")) {
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return false;
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}
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child = lxb_dom_node_next(child);
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if (!expected_element(child, "ellipsis") && !expected_element(child, "")) {
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return false;
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}
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child = lxb_dom_node_next(child);
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if (!expected_element(child, "invisible")) {
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return false;
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}
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child = lxb_dom_node_next(child);
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return child == nullptr;
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}
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static inline lxb_dom_node_t* emojify(lxb_dom_node_t* child, const std::vector<Emoji>& emojis) {
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size_t text_content_len;
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const char* text_content = reinterpret_cast<const char*>(lxb_dom_node_text_content(child, &text_content_len));
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std::vector<lxb_dom_node_t*> nodes = emojify(child->owner_document, std::string(text_content, text_content_len), emojis);
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lxb_dom_node_insert_after(child, nodes[0]);
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lxb_dom_node_destroy(child);
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child = nodes[0];
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for (size_t i = 1; i < nodes.size(); i++) {
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lxb_dom_node_insert_after(child, nodes[i]);
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child = nodes[i];
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}
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return child;
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}
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static std::regex shortcode_re(":([a-zA-Z0-9_]+):");
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static inline std::vector<lxb_dom_node_t*> emojify(lxb_dom_document_t* document, std::string str, const std::vector<Emoji>& emojis) {
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std::string buf;
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std::smatch sm;
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std::vector<lxb_dom_node*> res;
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while (std::regex_search(str, sm, shortcode_re)) {
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buf += sm.prefix();
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std::string group_0 = sm.str(0);
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auto emoji = std::find_if(emojis.begin(), emojis.end(), [&](const Emoji& i) { return i.shortcode == sm.str(1); });
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if (emoji != emojis.end()) {
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res.push_back(lxb_dom_interface_node(lxb_dom_document_create_text_node(document, reinterpret_cast<const lxb_char_t*>(buf.data()), buf.size())));
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buf.clear();
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lxb_dom_element_t* img = lxb_dom_element_create(document, reinterpret_cast<const lxb_char_t*>("IMG"), 3, nullptr, 0, nullptr, 0, nullptr, 0, false);
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lxb_dom_element_set_attribute(img, reinterpret_cast<const lxb_char_t*>("class"), 5, reinterpret_cast<const lxb_char_t*>("custom_emoji"), 12);
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lxb_dom_element_set_attribute(img, reinterpret_cast<const lxb_char_t*>("alt"), 3, reinterpret_cast<const lxb_char_t*>(group_0.data()), group_0.size());
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lxb_dom_element_set_attribute(img, reinterpret_cast<const lxb_char_t*>("title"), 5, reinterpret_cast<const lxb_char_t*>(group_0.data()), group_0.size());
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lxb_dom_element_set_attribute(img, reinterpret_cast<const lxb_char_t*>("src"), 3, reinterpret_cast<const lxb_char_t*>(emoji->url.data()), emoji->url.size());
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res.push_back(lxb_dom_interface_node(img));
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} else {
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buf += group_0;
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}
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str = sm.suffix();
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}
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if (!str.empty()) {
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buf += std::move(str);
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}
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if (!buf.empty()) {
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res.push_back(lxb_dom_interface_node(lxb_dom_document_create_text_node(document, reinterpret_cast<const lxb_char_t*>(buf.data()), buf.size())));
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}
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return res;
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}
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static Element serialize_post(const httplib::Request& req, const std::string& server, const Post& post, bool main_post, const std::optional<PostStatus>& post_status) {
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using namespace std::string_literals;
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std::string time_title = post.edited_at < 0
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? full_time(post.created_at)
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: "Created: "s + full_time(post.created_at) + "\nEdited: " + full_time(post.edited_at);
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const char* time_badge = post.edited_at < 0 ? "" : " (edited)";
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blankie::html::HTMLString preprocessed_html = preprocess_html(req, server, post.emojis, post.content);
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// Workaround for https://vt.social/@a1ba@suya.place/110552480243348878#m
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if (preprocessed_html.str.find("<p>") == std::string::npos) {
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preprocessed_html.str.reserve(preprocessed_html.str.size() + 3 + 4);
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preprocessed_html.str.insert(0, "<p>");
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preprocessed_html.str.append("</p>");
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}
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Element contents("div", {{"class", "post-contents"}}, {std::move(preprocessed_html)});
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Element post_attachments("div", {{"class", "post-attachments"}}, {});
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post_attachments.nodes.reserve(post.media_attachments.size());
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for (const Media& media : post.media_attachments) {
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post_attachments.nodes.push_back(serialize_media(media));
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}
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contents.nodes.push_back(std::move(post_attachments));
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if (post.poll) {
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contents.nodes.push_back(serialize_poll(req, *post.poll));
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}
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if (post.sensitive) {
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std::string spoiler_text = !post.spoiler_text.empty() ? post.spoiler_text : "See more";
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contents = Element("details", {
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Element("summary", {preprocess_html(req, post.emojis, std::move(spoiler_text))}),
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std::move(contents),
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});
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if (UserSettings(req).auto_open_cw) {
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contents.attributes.push_back({"open", ""});
|
|
}
|
|
}
|
|
|
|
Element div("div", {{"class", "post"}}, {
|
|
Element("div", {{"class", "post-header"}}, {
|
|
Element("a", {{"href", get_origin(req) + '/' + server + "/@" + post.account.acct(false)}}, {
|
|
Element("img", {{"class", "post-avatar"}, {"alt", "User profile picture"}, {"loading", "lazy"}, {"src", post.account.avatar_static}}, {}),
|
|
Element("span", {
|
|
Element("b", {preprocess_html(req, post.account.emojis, post.account.display_name)}),
|
|
Element("br"), "@", post.account.acct(),
|
|
}),
|
|
}),
|
|
Element("a", {{"class", "post-time_header"}, {"href", get_origin(req) + '/' + server + "/@" + post.account.acct(false) + '/' + post.id + "#m"}, {"title", time_title}}, {
|
|
Element("time", {{"datetime", to_rfc3339(post.created_at)}}, {relative_time(post.created_at, current_time()), time_badge}),
|
|
}),
|
|
}),
|
|
|
|
contents,
|
|
});
|
|
if (post_status) {
|
|
div.nodes.insert(div.nodes.begin(), Element("p", {
|
|
blankie::html::HTMLString(post_status->icon_html), " ", post_status->info_node,
|
|
}));
|
|
}
|
|
if (main_post) {
|
|
div.attributes = {{"class", "post main_post"}, {"id", "m"}};
|
|
}
|
|
|
|
return div;
|
|
}
|
|
|
|
static inline Element serialize_media(const Media& media) {
|
|
Element element = [&]() {
|
|
if (media.type == "image") {
|
|
return Element("a", {{"href", media.url}}, {
|
|
Element("img", {{"loading", "lazy"}, {"src", media.preview_url.value_or(media.url)}}, {}),
|
|
});
|
|
} else if (media.type == "video") {
|
|
Element video("video", {{"controls", ""}, {"src", media.url}}, {});
|
|
if (media.preview_url) {
|
|
video.attributes.push_back({"poster", *media.preview_url});
|
|
}
|
|
return video;
|
|
} else if (media.type == "audio") {
|
|
return Element("audio", {{"controls", ""}, {"src", media.url}}, {});
|
|
} else if (media.type == "gifv") {
|
|
// https://hachyderm.io/@Impossible_PhD/111444541628207638
|
|
Element video("video", {{"controls", ""}, {"loop", ""}, {"muted", ""}, {"autoplay", ""}, {"src", media.url}}, {});
|
|
if (media.preview_url) {
|
|
video.attributes.push_back({"poster", *media.preview_url});
|
|
}
|
|
return video;
|
|
} else if (media.type == "unknown" && media.remote_url) {
|
|
if (media.remote_url) {
|
|
// https://botsin.space/@lina@vt.social/111053598696451525
|
|
return Element("a", {{"href", *media.remote_url}}, {"Media is not available from this instance, view externally"});
|
|
} else {
|
|
return Element("p", {"Media is not available from this instance"});
|
|
}
|
|
} else {
|
|
return Element("p", {"Unsupported media type: ", media.type});
|
|
}
|
|
}();
|
|
|
|
if (media.description) {
|
|
element.attributes.push_back({"alt", *media.description});
|
|
element.attributes.push_back({"title", *media.description});
|
|
}
|
|
|
|
return element;
|
|
}
|
|
|
|
static inline Element serialize_poll(const httplib::Request& req, const Poll& poll) {
|
|
using namespace std::string_literals;
|
|
|
|
uint64_t voters_count = poll.voters_count >= 0 ? static_cast<uint64_t>(poll.voters_count) : poll.votes_count;
|
|
Element div("div");
|
|
|
|
auto pick_form = [](uint64_t count, const char* singular, const char* plural) {
|
|
return count == 1 ? singular : plural;
|
|
};
|
|
|
|
div.nodes.reserve(poll.options.size() + 1);
|
|
for (const PollOption& option : poll.options) {
|
|
std::string percentage = voters_count
|
|
? std::to_string(option.votes_count * 100 / voters_count) + '%'
|
|
: "0%";
|
|
|
|
div.nodes.push_back(Element("div", {{"class", "poll-option"}, {"title", std::to_string(option.votes_count) + pick_form(option.votes_count, " vote", " votes")}}, {
|
|
Element("b", {{"class", "poll-percentage"}}, {percentage}), " ", preprocess_html(req, poll.emojis, option.title),
|
|
Element("object", {{"class", "poll-bar"}, {"width", percentage}}, {}),
|
|
}));
|
|
}
|
|
|
|
Element p("p", poll.voters_count >= 0
|
|
? std::vector<Node>({std::to_string(voters_count), " ", pick_form(voters_count, "voter", "voters")})
|
|
: std::vector<Node>({std::to_string(poll.votes_count), " ", pick_form(poll.votes_count, "vote", "votes")})
|
|
);
|
|
if (poll.expired) {
|
|
p.nodes.push_back(" / ");
|
|
p.nodes.push_back(Element("time", {{"datetime", to_rfc3339(poll.expires_at)}, {"title", "Expired on "s + full_time(poll.expires_at)}}, {"Expired"}));
|
|
} else if (poll.expires_at >= 0) {
|
|
p.nodes.push_back(" / ");
|
|
p.nodes.push_back(Element("time", {{"datetime", to_rfc3339(poll.expires_at)}, {"title", full_time(poll.expires_at)}}, {
|
|
"Expires in ", relative_time(current_time(), poll.expires_at),
|
|
}));
|
|
}
|
|
div.nodes.push_back(std::move(p));
|
|
|
|
return div;
|
|
}
|