377 lines
13 KiB
PHP
377 lines
13 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Shimmie2;
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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 $hash;
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public string $mime;
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public int $size;
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/** @var Image[] */
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public array $images = [];
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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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*
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* @param string $tmpname The name of a physical file on the local hard drive.
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* @param string $filename The name of the file as it was uploaded.
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* @param int $slot The slot number of the upload.
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* @param array<string, string> $metadata Key-value pairs of metadata, the
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* upload form can contain both common and slot-specific fields such as
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* "source" and "source12", in which case the slot-specific field will
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* override the common one.
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*/
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public function __construct(
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public string $tmpname,
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public string $filename,
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public int $slot,
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public array $metadata,
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) {
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parent::__construct();
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$this->set_tmpname($tmpname);
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}
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public function set_tmpname(string $tmpname, ?string $mime = null): void
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{
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assert(is_readable($tmpname));
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$this->tmpname = $tmpname;
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$this->hash = \Safe\md5_file($tmpname);
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$this->size = \Safe\filesize($tmpname);
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$mime = $mime ?? MimeType::get_for_file($tmpname, get_file_ext($this->filename));
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if (empty($mime)) {
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throw new UploadException("Could not determine mime type");
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}
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$this->mime = strtolower($mime);
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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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abstract class UploadResult
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{
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public function __construct(
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public string $name
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) {
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}
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}
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class UploadError extends UploadResult
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{
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public function __construct(
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string $name,
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public string $error
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) {
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parent::__construct($name);
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}
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}
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class UploadSuccess extends UploadResult
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{
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public function __construct(
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string $name,
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public int $image_id
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) {
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parent::__construct($name);
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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): void
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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 < $min_free_space;
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}
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}
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}
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$config->set_default_bool(UploadConfig::MIME_CHECK_ENABLED, false);
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$config->set_default_array(
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UploadConfig::ALLOWED_MIME_STRINGS,
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DataHandlerExtension::get_all_supported_mimes()
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);
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}
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public function onSetupBuilding(SetupBuildingEvent $event): void
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{
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$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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$sb->start_table();
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$sb->add_bool_option(UploadConfig::MIME_CHECK_ENABLED, "Enable upload MIME checks", true);
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$sb->add_multichoice_option(UploadConfig::ALLOWED_MIME_STRINGS, $this->get_mime_options(), "Allowed MIME uploads", true);
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$sb->end_table();
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}
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/**
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* @return array<string, string>
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*/
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private function get_mime_options(): array
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{
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$output = [];
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foreach (DataHandlerExtension::get_all_supported_mimes() as $mime) {
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$output[MimeMap::get_name_for_mime($mime)] = $mime;
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}
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return $output;
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}
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public function onPageNavBuilding(PageNavBuildingEvent $event): void
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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 $event): void
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{
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if ($event->parent == "upload") {
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if (Extension::is_enabled(WikiInfo::KEY)) {
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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): void
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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 ($event->size > $config->get_int(UploadConfig::SIZE)) {
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$size = to_shorthand_int($event->size);
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$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): void
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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", method: "GET", permission: Permissions::CREATE_IMAGE)) {
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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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$this->theme->display_page($page);
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}
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if ($event->page_matches("upload", method: "POST", permission: Permissions::CREATE_IMAGE)) {
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if ($this->is_full) {
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$this->theme->display_error(507, "Error", "Can't upload images: disk nearly full");
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return;
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}
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$results = [];
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$files = array_filter($_FILES, function ($file) {
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return !empty($file['name']);
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});
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foreach ($files as $name => $file) {
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$slot = int_escape(substr($name, 4));
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$results = array_merge($results, $this->try_upload($file, $slot, only_strings($event->POST)));
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}
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$urls = array_filter($event->POST, function ($value, $key) {
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return str_starts_with($key, "url") && is_string($value) && strlen($value) > 0;
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}, ARRAY_FILTER_USE_BOTH);
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foreach ($urls as $name => $value) {
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$slot = int_escape(substr($name, 3));
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$results = array_merge($results, $this->try_transload($value, $slot, only_strings($event->POST)));
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}
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$this->theme->display_upload_status($page, $results);
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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 mixed[] $file
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* @param array<string, string> $metadata
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* @return UploadResult[]
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*/
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private function try_upload(array $file, int $slot, array $metadata): array
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{
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global $page, $config, $database;
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// blank file boxes cause empty uploads, no need for error message
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if (empty($file['name'])) {
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return [];
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}
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$results = [];
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for ($i = 0; $i < count($file['name']); $i++) {
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$name = $file['name'][$i];
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$error = $file['error'][$i];
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$tmp_name = $file['tmp_name'][$i];
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if (empty($name)) {
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continue;
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}
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try {
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// check if the upload was successful
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if ($error !== UPLOAD_ERR_OK) {
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throw new UploadException($this->upload_error_message($error));
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}
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$new_images = $database->with_savepoint(function () use ($tmp_name, $name, $slot, $metadata) {
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$event = send_event(new DataUploadEvent($tmp_name, basename($name), $slot, $metadata));
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if (count($event->images) == 0) {
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throw new UploadException("MIME type not supported: " . $event->mime);
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}
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return $event->images;
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});
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foreach ($new_images as $image) {
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$results[] = new UploadSuccess($name, $image->id);
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}
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} catch (UploadException $ex) {
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$results[] = new UploadError($name, $ex->getMessage());
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}
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}
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return $results;
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}
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/**
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* @param array<string, string> $metadata
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* @return UploadResult[]
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*/
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private function try_transload(string $url, int $slot, array $metadata): array
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{
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global $page, $config, $user, $database;
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$results = [];
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$tmp_filename = shm_tempnam("transload");
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try {
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// Fetch file
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try {
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$headers = fetch_url($url, $tmp_filename);
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} catch (FetchException $e) {
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throw new UploadException("Error reading from $url: $e");
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}
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// Parse metadata
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$s_filename = find_header($headers, 'Content-Disposition');
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$h_filename = ($s_filename ? preg_replace_ex('/^.*filename="([^ ]+)"/i', '$1', $s_filename) : null);
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$filename = $h_filename ?: basename($url);
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$new_images = $database->with_savepoint(function () use ($tmp_filename, $filename, $slot, $metadata) {
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$event = send_event(new DataUploadEvent($tmp_filename, $filename, $slot, $metadata));
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if (count($event->images) == 0) {
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throw new UploadException("File type not supported: " . $event->mime);
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}
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return $event->images;
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});
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foreach ($new_images as $image) {
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$results[] = new UploadSuccess($url, $image->id);
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}
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} catch (UploadException $ex) {
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$results[] = new UploadError($url, $ex->getMessage());
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} finally {
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if (file_exists($tmp_filename)) {
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unlink($tmp_filename);
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}
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}
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return $results;
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}
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}
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