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path: root/src/plugins/Pleroma.cpp
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#include "../../plugins/Pleroma.hpp"
#include "../../include/Json.hpp"
#include "../../include/NetUtils.hpp"
extern "C" {
#include <HtmlParser.h>
}

namespace QuickMedia {
    struct HtmlParseUserdata {
        std::string result;
    };

    static void html_parse_callback(HtmlParser *html_parser, HtmlParseType parse_type, void *userdata) {
        HtmlParseUserdata *parse_userdata = (HtmlParseUserdata*)userdata;
        if(parse_type == HTML_PARSE_TEXT) {
            parse_userdata->result.append(html_parser->text_stripped.data, html_parser->text_stripped.size);
        } else if(parse_type == HTML_PARSE_TAG_END) {
            if(html_parser->tag_name.size == 4 && strncmp(html_parser->tag_name.data, "span", 4) == 0)
                parse_userdata->result += ' ';
            else if(html_parser->tag_name.size == 1 && strncmp(html_parser->tag_name.data, "p", 1) == 0)
                parse_userdata->result += "\n\n";
            else if(html_parser->tag_name.size == 2 && strncmp(html_parser->tag_name.data, "br", 2) == 0)
                parse_userdata->result += '\n';
        }
    }

    std::shared_ptr<BodyItem> post_json_to_body_item(const rapidjson::Value &post_json, const std::string &instance, int &num_favorites, int &num_reblogs, int &num_replies) {
        num_favorites = 0;
        num_reblogs = 0;
        num_replies = 0;

        if(!post_json.IsObject())
            return nullptr;

        const rapidjson::Value &account_json = GetMember(post_json, "account");
        if(!account_json.IsObject())
            return nullptr;

        const rapidjson::Value &acct_json = GetMember(account_json, "acct");
        if(!acct_json.IsString())
            return nullptr;

        std::string username;

        const rapidjson::Value &display_name_json = GetMember(account_json, "display_name");
        if(display_name_json.IsString()) {
            username.append(display_name_json.GetString(), display_name_json.GetStringLength());
            username += ' ';
        }
        username.append(acct_json.GetString(), acct_json.GetStringLength());
        if(!strchr(acct_json.GetString(), '@'))
            username += "@" + instance;

        auto body_item = BodyItem::create("");
        body_item->set_author(std::move(username));

        const rapidjson::Value &content_json = GetMember(post_json, "content");
        if(content_json.IsString()) {
            std::string content(content_json.GetString(), content_json.GetStringLength());

            HtmlParseUserdata parse_userdata;
            HtmlParser html_parser;
            html_parser_init(&html_parser, content.data(), content.size(), html_parse_callback, &parse_userdata);
            html_parser_parse(&html_parser);
            html_parser_deinit(&html_parser);

            while(!parse_userdata.result.empty() && parse_userdata.result.back() == '\n')
                parse_userdata.result.pop_back();
            html_unescape_sequences(parse_userdata.result);
            body_item->set_description(std::move(parse_userdata.result));
        }

        const rapidjson::Value &avatar_json = GetMember(account_json, "avatar");
        if(avatar_json.IsString()) {
            body_item->thumbnail_url = std::string(avatar_json.GetString(), avatar_json.GetStringLength());
            body_item->thumbnail_size = sf::Vector2i(48, 48);
            body_item->thumbnail_mask_type = ThumbnailMaskType::CIRCLE;
        }

        // TODO: Display all attached images by embedded images in Text. Each image in Text should always be on its own line
        const rapidjson::Value &media_attachments_json = GetMember(post_json, "media_attachments");
        if(media_attachments_json.IsArray() && !media_attachments_json.Empty() && media_attachments_json.GetArray()[0].IsObject()) {
            const rapidjson::Value &media_attachment_json = media_attachments_json.GetArray()[0];
            const rapidjson::Value &preview_url = GetMember(media_attachment_json, "preview_url");
            const rapidjson::Value &type_json = GetMember(media_attachment_json, "type");
            // TODO: Support video preview image, or display dummy image that shows there is a video
            if(preview_url.IsString() && type_json.IsString() && strcmp(type_json.GetString(), "image") == 0) {
                body_item->thumbnail_url = std::string(preview_url.GetString(), preview_url.GetStringLength());
                body_item->thumbnail_size = sf::Vector2i(0, 0);
                body_item->thumbnail_mask_type = ThumbnailMaskType::NONE;
            }
        }

        const rapidjson::Value &favourites_count_json = GetMember(post_json, "favourites_count");
        if(favourites_count_json.IsNumber())
            num_favorites = favourites_count_json.GetInt();

        const rapidjson::Value &reblogs_count_json = GetMember(post_json, "reblogs_count");
        if(reblogs_count_json.IsNumber())
            num_reblogs = reblogs_count_json.GetInt();

        const rapidjson::Value &replies_count_json = GetMember(post_json, "replies_count");
        if(replies_count_json.IsNumber())
            num_replies = replies_count_json.GetInt();

        const rapidjson::Value &id_json = GetMember(post_json, "id");
        if(id_json.IsString())
            body_item->url.assign(id_json.GetString(), id_json.GetStringLength());

        return body_item;
    }

    PluginResult Pleroma::get_home_posts(BodyItems &results, const std::string &max_id) {
        std::vector<CommandArg> additional_args = {
            { "-X", "GET" },
            { "-H", "Authorization: Bearer " + auth_token }
        };

        char request_url[512];
        if(max_id.empty())
            snprintf(request_url, sizeof(request_url), "https://%s/api/v1/timelines/home", instance.c_str());
        else
            snprintf(request_url, sizeof(request_url), "https://%s/api/v1/timelines/home?max_id=%s", instance.c_str(), max_id.c_str());

        rapidjson::Document json_root;
        DownloadResult download_result = download_json(json_root, request_url, std::move(additional_args), true);
        if(download_result != DownloadResult::OK) return download_result_to_plugin_result(download_result);

        if(!json_root.IsArray())
            return PluginResult::ERR;

        for(auto &post_json : json_root.GetArray()) {
            int post_num_favourites = 0;
            int post_num_reblogs = 0;
            int post_num_replies = 0;
            auto post_body_item = post_json_to_body_item(post_json, instance, post_num_favourites, post_num_reblogs, post_num_replies);
            if(!post_body_item)
                continue;

            const rapidjson::Value &reblog_json = GetMember(post_json, "reblog");
            if(reblog_json.IsObject()) {
                auto reblog_body_item = post_json_to_body_item(reblog_json, instance, post_num_favourites, post_num_reblogs, post_num_replies);
                if(reblog_body_item) {
                    post_body_item->set_author(post_body_item->get_author() + " reposted:\n" + reblog_body_item->get_author());
                    post_body_item->set_description(reblog_body_item->get_description());
                    if(reblog_body_item->thumbnail_url.empty()) {
                        post_body_item->thumbnail_url.clear();
                        post_body_item->thumbnail_size = sf::Vector2i(0, 0);
                        post_body_item->thumbnail_mask_type = ThumbnailMaskType::NONE;
                    } else {
                        post_body_item->thumbnail_url = std::move(reblog_body_item->thumbnail_url);
                        post_body_item->thumbnail_size = reblog_body_item->thumbnail_size;
                        post_body_item->thumbnail_mask_type = reblog_body_item->thumbnail_mask_type;
                    }
                }
            }

            post_body_item->add_reaction("Replies: " + std::to_string(post_num_replies), nullptr);
            post_body_item->add_reaction("Reposts: " + std::to_string(post_num_reblogs), nullptr);
            post_body_item->add_reaction("👍: " + std::to_string(post_num_favourites), nullptr);

            results.push_back(std::move(post_body_item));
        }

        return PluginResult::OK;
    }

    PluginResult PleromaHomePage::lazy_fetch(BodyItems &result_items) {
        PluginResult result = pleroma->get_home_posts(result_items);
        if(result == PluginResult::OK && !result_items.empty())
            last_item_id = result_items.back()->url;
        return result;
    }

    PluginResult PleromaHomePage::get_page(const std::string&, int page, BodyItems &result_items) {
        // TODO: handle search param |arg1|
        while(current_page < page && !last_item_id.empty()) {
            PluginResult result = pleroma->get_home_posts(result_items, last_item_id);
            if(result != PluginResult::OK)
                return result;
            ++current_page;
        }
        if(!result_items.empty())
            last_item_id = result_items.back()->url;
        else
            last_item_id.clear();
        return PluginResult::OK;
    }
}