442 lines
16 KiB
PHP
442 lines
16 KiB
PHP
<?php
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declare(strict_types=1);
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require_once "config.php";
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/**
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* Occurs when some data is being uploaded.
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*/
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class DataUploadEvent extends Event
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{
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public string $tmpname;
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public array $metadata;
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public string $hash;
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public string $mime = "";
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public int $image_id = -1;
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public ?int $replace_id = null;
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public bool $handled = false;
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public bool $merged = false;
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/**
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* Some data is being uploaded.
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* This should be caught by a file handler.
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* $metadata should contain at least "filename", "extension", "tags" and "source".
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*/
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public function __construct(string $tmpname, array $metadata)
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{
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parent::__construct();
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assert(file_exists($tmpname));
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assert(is_string($metadata["filename"]));
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assert(is_array($metadata["tags"]));
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assert(is_string($metadata["source"]) || is_null($metadata["source"]));
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// DB limits to 255 char filenames
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$metadata['filename'] = substr($metadata['filename'], 0, 255);
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$this->metadata = $metadata;
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$this->set_tmpname($tmpname);
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if (array_key_exists("extension", $metadata)) {
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$mime = MimeType::get_for_file($tmpname, $metadata["extension"]);
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} else {
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$mime = MimeType::get_for_file($tmpname);
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}
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if (empty($mime)) {
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throw new UploadException("Could not determine mime type for file " . $metadata["filename"]);
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}
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$this->set_mime($mime);
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}
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public function set_mime(String $mime)
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{
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$this->mime = strtolower($mime);
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$this->metadata["mime"] = $this->mime;
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}
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public function set_tmpname(String $tmpname)
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{
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$this->tmpname = $tmpname;
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$this->metadata['hash'] = md5_file($tmpname);
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$this->metadata['size'] = filesize($tmpname);
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// useful for most file handlers, so pull directly into fields
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$this->hash = $this->metadata['hash'];
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}
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}
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class UploadException extends SCoreException
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{
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}
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/**
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* Main upload class.
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* All files that are uploaded to the site are handled through this class.
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* This also includes transloaded files as well.
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*/
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class Upload extends Extension
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{
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/** @var UploadTheme */
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protected ?Themelet $theme;
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public bool $is_full;
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/**
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* Early, so it can stop the DataUploadEvent before any data handlers see it.
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*/
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public function get_priority(): int
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{
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return 40;
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}
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public function onInitExt(InitExtEvent $event)
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{
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global $config;
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$config->set_default_int(UploadConfig::COUNT, 3);
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$config->set_default_int(UploadConfig::SIZE, parse_shorthand_int('1MB'));
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$config->set_default_int(UploadConfig::MIN_FREE_SPACE, parse_shorthand_int('100MB'));
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$config->set_default_bool(UploadConfig::TLSOURCE, true);
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$this->is_full = false;
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$min_free_space = $config->get_int(UploadConfig::MIN_FREE_SPACE);
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if ($min_free_space > 0) {
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// SHIT: fucking PHP "security" measures -_-;;;
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$img_path = realpath("./images/");
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if ($img_path) {
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$free_num = @disk_free_space($img_path);
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if ($free_num !== false) {
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$this->is_full = $free_num < $min_free_space;
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}
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}
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}
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}
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public function onSetupBuilding(SetupBuildingEvent $event)
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{
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$tes = [];
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$tes["Disabled"] = "none";
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if (function_exists("curl_init")) {
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$tes["cURL"] = "curl";
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}
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$tes["fopen"] = "fopen";
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$tes["WGet"] = "wget";
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$sb = $event->panel->create_new_block("Upload");
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$sb->position = 10;
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// Output the limits from PHP so the user has an idea of what they can set.
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$sb->add_int_option(UploadConfig::COUNT, "Max uploads: ");
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$sb->add_label("<i>PHP Limit = " . ini_get('max_file_uploads') . "</i>");
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$sb->add_shorthand_int_option(UploadConfig::SIZE, "<br/>Max size per file: ");
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$sb->add_label("<i>PHP Limit = " . ini_get('upload_max_filesize') . "</i>");
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$sb->add_choice_option(UploadConfig::TRANSLOAD_ENGINE, $tes, "<br/>Transload: ");
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$sb->add_bool_option(UploadConfig::TLSOURCE, "<br/>Use transloaded URL as source if none is provided: ");
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}
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public function onPageNavBuilding(PageNavBuildingEvent $event)
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{
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global $user;
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if ($user->can(Permissions::CREATE_IMAGE)) {
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$event->add_nav_link("upload", new Link('upload'), "Upload");
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}
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}
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public function onPageSubNavBuilding(PageSubNavBuildingEvent $event)
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{
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if ($event->parent=="upload") {
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if (class_exists("Wiki")) {
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$event->add_nav_link("upload_guidelines", new Link('wiki/upload_guidelines'), "Guidelines");
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}
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}
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}
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public function onDataUpload(DataUploadEvent $event)
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{
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global $config;
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if ($this->is_full) {
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throw new UploadException("Upload failed; disk nearly full");
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}
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if (filesize($event->tmpname) > $config->get_int(UploadConfig::SIZE)) {
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$size = to_shorthand_int(filesize($event->tmpname));
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$limit = to_shorthand_int($config->get_int(UploadConfig::SIZE));
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throw new UploadException("File too large ($size > $limit)");
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}
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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global $cache, $page, $user;
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if ($user->can(Permissions::CREATE_IMAGE)) {
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if ($this->is_full) {
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$this->theme->display_full($page);
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} else {
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$this->theme->display_block($page);
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}
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}
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if ($event->page_matches("upload/replace")) {
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if (!$user->can(Permissions::REPLACE_IMAGE)) {
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$this->theme->display_error(403, "Error", "{$user->name} doesn't have permission to replace images");
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return;
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}
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if ($this->is_full) {
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$this->theme->display_error(507, "Error", "Can't replace images: disk nearly full");
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return;
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}
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// Try to get the image ID
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if ($event->count_args() >= 1) {
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$image_id = int_escape($event->get_arg(0));
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} elseif (isset($_POST['image_id'])) {
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$image_id = int_escape($_POST['image_id']);
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} else {
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throw new UploadException("Can not replace Post: No valid Post ID given.");
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}
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$image_old = Image::by_id($image_id);
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if (is_null($image_old)) {
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throw new UploadException("Can not replace Post: No post with ID $image_id");
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}
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$source = $_POST['source'] ?? null;
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if (!empty($_POST["url"])) {
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$image_ids = $this->try_transload($_POST["url"], [], $source, $image_id);
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$cache->delete("thumb-block:{$image_id}");
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$this->theme->display_upload_status($page, $image_ids);
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} elseif (count($_FILES) > 0) {
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$image_ids = $this->try_upload($_FILES["data"], [], $source, $image_id);
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$cache->delete("thumb-block:{$image_id}");
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$this->theme->display_upload_status($page, $image_ids);
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} elseif (!empty($_GET['url'])) {
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$image_ids = $this->try_transload($_GET['url'], [], $source, $image_id);
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$cache->delete("thumb-block:{$image_id}");
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$this->theme->display_upload_status($page, $image_ids);
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} else {
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$this->theme->display_replace_page($page, $image_id);
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}
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} elseif ($event->page_matches("upload")) {
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if (!$user->can(Permissions::CREATE_IMAGE)) {
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$this->theme->display_error(403, "Error", "{$user->name} doesn't have permission to upload images");
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return;
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}
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if ($this->is_full) {
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$this->theme->display_error(507, "Error", "Can't upload images: disk nearly full");
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return;
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}
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/* Regular Upload Image */
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if (count($_FILES) > 0 || count($_POST) > 0) {
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$image_ids = [];
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foreach ($_FILES as $name => $file) {
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$tags = $this->tags_for_upload_slot(int_escape(substr($name, 4)));
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$source = $_POST['source'] ?? null;
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$image_ids += $this->try_upload($file, $tags, $source);
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}
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foreach ($_POST as $name => $value) {
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if (str_starts_with($name, "url") && strlen($value) > 0) {
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$tags = $this->tags_for_upload_slot(int_escape(substr($name, 3)));
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$source = $_POST['source'] ?? $value;
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$image_ids += $this->try_transload($value, $tags, $source);
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}
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}
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$this->theme->display_upload_status($page, $image_ids);
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} elseif (!empty($_GET['url'])) {
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$url = $_GET['url'];
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$source = $_GET['source'] ?? $url;
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$tags = ['tagme'];
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if (!empty($_GET['tags']) && $_GET['tags'] != "null") {
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$tags = Tag::explode($_GET['tags']);
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}
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$image_ids = $this->try_transload($url, $tags, $source);
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$this->theme->display_upload_status($page, $image_ids);
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} else {
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$this->theme->display_page($page);
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}
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}
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}
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private function tags_for_upload_slot(int $id): array
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{
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# merge then explode, not explode then merge - else
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# one of the merges may create a surplus "tagme"
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return Tag::explode(
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($_POST["tags"] ?? "") .
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" " .
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($_POST["tags$id"] ?? "")
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);
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}
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/**
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* Returns a descriptive error message for the specified PHP error code.
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*
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* This is a helper function based on the one from the online PHP Documentation
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* which is licensed under Creative Commons Attribution 3.0 License
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*
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* TODO: Make these messages user/admin editable
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*/
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private function upload_error_message(int $error_code): string
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{
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switch ($error_code) {
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case UPLOAD_ERR_INI_SIZE:
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return 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
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case UPLOAD_ERR_FORM_SIZE:
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return 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
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case UPLOAD_ERR_PARTIAL:
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return 'The uploaded file was only partially uploaded';
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case UPLOAD_ERR_NO_FILE:
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return 'No file was uploaded';
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case UPLOAD_ERR_NO_TMP_DIR:
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return 'Missing a temporary folder';
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case UPLOAD_ERR_CANT_WRITE:
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return 'Failed to write file to disk';
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case UPLOAD_ERR_EXTENSION:
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return 'File upload stopped by extension';
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default:
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return 'Unknown upload error';
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}
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}
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/**
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* Handle an upload.
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* #param string[] $file
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* #param string[] $tags
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*/
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private function try_upload(array $file, array $tags, ?string $source = null, ?int $replace_id = null): array
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{
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global $page, $config;
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// blank file boxes cause empty uploads, no need for error message
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if (empty($file['name'])) {
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return [];
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}
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if (empty($source)) {
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$source = null;
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}
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$image_ids = [];
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$num_files = count($file['name']);
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$limit = $config->get_int(UploadConfig::COUNT);
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try {
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if ($num_files > $limit) {
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throw new UploadException("Upload limited to $limit");
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}
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for ($i = 0; $i < $num_files; $i++) {
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if (empty($file['name'][$i])) {
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continue;
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}
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try {
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// check if the upload was successful
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if ($file['error'][$i] !== UPLOAD_ERR_OK) {
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throw new UploadException($this->upload_error_message($file['error'][$i]));
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}
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$pathinfo = pathinfo($file['name'][$i]);
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$metadata = [];
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$metadata['filename'] = $pathinfo['basename'];
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$metadata['extension'] = $pathinfo['extension'] ?? "";
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$metadata['mime'] = MimeType::get_for_file($file['tmp_name'][$i], $metadata['extension']);
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if (empty($metadata['mime'])) {
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throw new UploadException("Unable to determine MIME for file " . $metadata['filename']);
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}
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$metadata['tags'] = $tags;
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$metadata['source'] = $source;
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$event = new DataUploadEvent($file['tmp_name'][$i], $metadata);
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$event->replace_id = $replace_id;
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send_event($event);
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if ($event->image_id == -1) {
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throw new UploadException("MIME type not supported: " . $metadata['mime']);
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}
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$image_ids[] = $event->image_id;
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$page->add_http_header("X-Shimmie-Post-ID: " . $event->image_id);
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} catch (UploadException $ex) {
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$this->theme->display_upload_error(
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$page,
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"Error with " . html_escape($file['name'][$i]),
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$ex->getMessage()
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);
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}
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}
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} catch (UploadException $ex) {
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$this->theme->display_upload_error(
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$page,
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"Error with upload",
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$ex->getMessage()
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);
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}
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return $image_ids;
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}
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private function try_transload(string $url, array $tags, string $source = null, ?int $replace_id = null): array
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{
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global $page, $config, $user;
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$image_ids = [];
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$tmp_filename = tempnam(ini_get('upload_tmp_dir'), "shimmie_transload");
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try {
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// Fetch file
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$headers = fetch_url($url, $tmp_filename);
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if (is_null($headers)) {
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log_warning("core-util", "Failed to fetch $url");
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throw new UploadException("Error reading from " . html_escape($url));
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}
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if (filesize($tmp_filename) == 0) {
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throw new UploadException("No data found in " . html_escape($url) . " -- perhaps the site has hotlink protection?");
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}
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// Parse metadata
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$s_filename = find_header($headers, 'Content-Disposition');
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$h_filename = ($s_filename ? preg_replace('/^.*filename="([^ ]+)"/i', '$1', $s_filename) : null);
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$filename = $h_filename ?: basename($url);
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$pathinfo = pathinfo($url);
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$metadata = [];
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$metadata['filename'] = $filename;
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$metadata['tags'] = $tags;
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$metadata['source'] = (($url == $source) && !$config->get_bool(UploadConfig::TLSOURCE) ? "" : $source);
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$metadata['extension'] = $pathinfo['extension'] ?? "";
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if ($user->can(Permissions::EDIT_IMAGE_LOCK) && !empty($_GET['locked'])) {
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$metadata['locked'] = bool_escape($_GET['locked']) ? "on" : "";
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}
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if (Extension::is_enabled(RatingsInfo::KEY) && !empty($_GET['rating'])) {
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// Rating event will validate that this is s/q/e/u
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$metadata['rating'] = strtolower($_GET['rating'])[0];
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}
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// Upload file
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$event = new DataUploadEvent($tmp_filename, $metadata);
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$event->replace_id = $replace_id;
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send_event($event);
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if ($event->image_id == -1) {
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throw new UploadException("File type not supported: " . $metadata['extension']);
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}
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$image_ids[] = $event->image_id;
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} catch (UploadException $ex) {
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$this->theme->display_upload_error(
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$page,
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"Error with " . html_escape($url),
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$ex->getMessage()
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);
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} finally {
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if (file_exists($tmp_filename)) {
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unlink($tmp_filename);
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}
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}
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return $image_ids;
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}
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}
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