satori-services/public/booru.php

<?php
ini_set('display_errors', 'on');
error_reporting(-1);

define('BOORUS', [
    'danbooru',
    'gelbooru',
    'yandere',
]);

define('BOORU_INFOS', [
    'danbooru' => [
        'title' => 'Danbooru',
        'type' => 'danbooru',
        'randomUrlFormat' => 'https://danbooru.donmai.us/posts.json?limit=20&tags=order:random+limit:20+%s',
        'postUrlFormat' => 'https://danbooru.donmai.us/posts/%s',
        'implicitTags' => [
            'misaka_mikoto' => ['-shokuhou_misaki'],
            'shokuhou_misaki' => ['-misaka_mikoto'],
            'kagari_(rewrite)' => ['-screencap'],
            'kasuga_ayumu' => ['-rating:explicit'],
            'osaka_(azumanga_daioh)' => ['-rating:explicit'],
        ],
    ],
    'gelbooru' => [
        'title' => 'Gelbooru',
        'type' => 'gelbooru',
        'randomUrlFormat' => 'https://gelbooru.com/index.php?page=dapi&s=post&q=index&json=1&limit=20&tags=sort:random+%s',
        'postUrlFormat' => 'https://gelbooru.com/index.php?page=post&s=view&id=%s',
        'implicitTags' => [
            'misaka_mikoto' => ['-shokuhou_misaki'],
            'shokuhou_misaki' => ['-misaka_mikoto'],
            'kagari_(rewrite)' => ['-screencap'],
            'kasuga_ayumu' => ['-rating:explicit'],
        ],
    ],
    'yandere' => [
        'title' => 'Yande.re',
        'type' => 'yandere',
        'randomUrlFormat' => 'https://yande.re/post.json?api_version=2&limit=20&tags=order:random+%s',
        'postUrlFormat' => 'https://yande.re/post/show/%s',
        'implicitTags' => [
            'misaka_mikoto' => ['-shokuhou_misaki'],
            'shokuhou_misaki' => ['-misaka_mikoto'],
            'kagari_(rewrite)' => ['-cap'],
            'kasuga_ayumu' => ['-rating:explicit'],
        ],
    ],
]);

$config = parse_ini_file(__DIR__ . '/../config/flashii.ini');

header('Content-Type: application/json; charset=utf-8');

$booru = (string)filter_input(INPUT_GET, 'b');
$tags = (string)filter_input(INPUT_GET, 't');
$tags = array_filter(explode(' ', trim($tags)));

$randomSource = empty($booru);

if($randomSource)
    $booru = BOORUS[0];
elseif(!in_array($booru, BOORUS))
    die('{"error":"booru"}');

if($booru === 'danbooru' && $randomSource)
    $booru = BOORUS[1 + (array_rand(BOORUS) - 1)];

if(!array_key_exists($booru, BOORU_INFOS))
    die('{"error":"booru-info"}');

$booruInfo = BOORU_INFOS[$booru];

if(empty($booruInfo['randomUrlFormat']))
    die('{"error":"random"}');
if(empty($booruInfo['postUrlFormat']))
    die('{"error":"post"}');
if(empty($booruInfo['type']))
    die('{"error":"type"}');

$isDanbooru = $booruInfo['type'] === 'danbooru';
$isGelbooru = $booruInfo['type'] === 'gelbooru';
$isYandere = $booruInfo['type'] === 'yandere';

if(!empty($booruInfo['implicitTags'])) {
    $originalTags = $tags;
    foreach($booruInfo['implicitTags'] as $targetTag => $addTags) {
        if(!in_array($targetTag, $originalTags))
            continue;

        foreach($addTags as $tag)
            if(!in_array($tag, $tags))
                $tags[] = $tag;
    }
}

$tagString = implode('+', array_map(fn($x) => urlencode($x), $tags));

$curl = curl_init(sprintf($booruInfo['randomUrlFormat'], $tagString));

$headers = ['Accept: application/json'];
if($isDanbooru)
    $headers[] = 'Authorization: Basic ' . base64_encode($config['danbooru-token']);

curl_setopt_array($curl, [
    CURLOPT_AUTOREFERER => true,
    CURLOPT_CERTINFO => false,
    CURLOPT_FAILONERROR => false,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_MAXREDIRS => 5,
    CURLOPT_PATH_AS_IS => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TCP_FASTOPEN => true,
    CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
    CURLOPT_REDIR_PROTOCOLS => CURLPROTO_HTTPS,
    CURLOPT_CONNECTTIMEOUT => 2,
    CURLOPT_TIMEOUT => 5,
    CURLOPT_USERAGENT => 'Satori/20230202 (+https://fii.moe/satori)',
    CURLOPT_HTTPHEADER => $headers,
]);
$response = json_decode(curl_exec($curl));
curl_close($curl);

$posts = [];

// gelbooru and yandere block remote embedding, so not even going to bother with a file_url for those

if($isDanbooru) {
    if(!empty($response) && is_array($response)) {
        foreach($response as $raw) {
            $posts[] = $post = new stdClass;
            $post->id = $raw->id;
            $post->rating = $raw->rating;
            if(!empty($raw->file_url))
                $post->file_url = $raw->file_url;
            $post->post_url = sprintf($booruInfo['postUrlFormat'], $raw->id);
            $post->tags = explode(' ', $raw->tag_string);
            $post->tags_general = explode(' ', $raw->tag_string_general);
            $post->tags_character = explode(' ', $raw->tag_string_character);
            $post->tags_copyright = explode(' ', $raw->tag_string_copyright);
            $post->tags_artist = explode(' ', $raw->tag_string_artist);
            $post->tags_meta = explode(' ', $raw->tag_string_meta);
        }
    }
} elseif($isGelbooru) {
    if(!empty($response) && !empty($response->post) && is_array($response->post)) {
        foreach($response->post as $raw) {
            $posts[] = $post = new stdClass;
            $post->id = $raw->id;
            $post->rating = $raw->rating[0];
            //if(!empty($raw->file_url))
            //    $post->file_url = $raw->file_url;
            $post->post_url = sprintf($booruInfo['postUrlFormat'], $raw->id);
            $post->tags = explode(' ', $raw->tags);
        }
    }
} elseif($isYandere) {
    if(!empty($response) && !empty($response->posts) && is_array($response->posts)) {
        foreach($response->posts as $raw) {
            $posts[] = $post = new stdClass;
            $post->id = $raw->id;
            $post->rating = $raw->rating;
            //if(!empty($raw->file_url))
            //    $post->file_url = $raw->file_url;
            $post->post_url = sprintf($booruInfo['postUrlFormat'], $raw->id);
            $post->tags = explode(' ', $raw->tags);
        }
    }
} else
    die('{"error":"support"}');

echo json_encode([
    'source' => [
        'name' => $booru,
        'type' => $booruInfo['type'],
        'title' => $booruInfo['title'] ?? $booru,
    ],
    'tags' => $tags,
    'posts' => $posts,
]);