312 lines
12 KiB
PHP
312 lines
12 KiB
PHP
<?php declare(strict_types=1);
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require_once "config.php";
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/**
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* A class to handle adding / getting / removing image files from the disk.
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*/
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class ImageIO extends Extension
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{
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/** @var ImageIOTheme */
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protected $theme;
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const COLLISION_OPTIONS = ['Error'=>ImageConfig::COLLISION_ERROR, 'Merge'=>ImageConfig::COLLISION_MERGE];
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const EXIF_READ_FUNCTION = "exif_read_data";
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const THUMBNAIL_ENGINES = [
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'Built-in GD' => MediaEngine::GD,
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'ImageMagick' => MediaEngine::IMAGICK
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];
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const THUMBNAIL_TYPES = [
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'JPEG' => "jpg",
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'WEBP (Not IE/Safari compatible)' => "webp"
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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(ImageConfig::THUMB_WIDTH, 192);
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$config->set_default_int(ImageConfig::THUMB_HEIGHT, 192);
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$config->set_default_int(ImageConfig::THUMB_SCALING, 100);
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$config->set_default_int(ImageConfig::THUMB_QUALITY, 75);
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$config->set_default_string(ImageConfig::THUMB_TYPE, 'jpg');
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if (function_exists(self::EXIF_READ_FUNCTION)) {
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$config->set_default_bool(ImageConfig::SHOW_META, false);
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}
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$config->set_default_string(ImageConfig::ILINK, '');
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$config->set_default_string(ImageConfig::TLINK, '');
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$config->set_default_string(ImageConfig::TIP, '$tags // $size // $filesize');
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$config->set_default_string(ImageConfig::UPLOAD_COLLISION_HANDLER, ImageConfig::COLLISION_ERROR);
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$config->set_default_int(ImageConfig::EXPIRES, (60*60*24*31)); // defaults to one month
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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if ($event->page_matches("image/delete")) {
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global $page, $user;
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if ($user->can(Permissions::DELETE_IMAGE) && isset($_POST['image_id']) && $user->check_auth_token()) {
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$image = Image::by_id(int_escape($_POST['image_id']));
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if ($image) {
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send_event(new ImageDeletionEvent($image));
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$page->set_mode(PageMode::REDIRECT);
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if (isset($_SERVER['HTTP_REFERER']) && !strstr($_SERVER['HTTP_REFERER'], 'post/view')) {
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$page->set_redirect($_SERVER['HTTP_REFERER']);
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} else {
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$page->set_redirect(make_link("post/list"));
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}
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}
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}
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} elseif ($event->page_matches("image/replace")) {
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global $page, $user;
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if ($user->can(Permissions::REPLACE_IMAGE) && isset($_POST['image_id']) && $user->check_auth_token()) {
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$image = Image::by_id($_POST['image_id']);
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if ($image) {
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$page->set_mode(PageMode::REDIRECT);
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$page->set_redirect(make_link('upload/replace/'.$image->id));
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} else {
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/* Invalid image ID */
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throw new ImageReplaceException("Image to replace does not exist.");
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}
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}
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} elseif ($event->page_matches("image")) {
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$num = int_escape($event->get_arg(0));
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$this->send_file($num, "image");
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} elseif ($event->page_matches("thumb")) {
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$num = int_escape($event->get_arg(0));
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$this->send_file($num, "thumb");
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}
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}
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public function onImageAdminBlockBuilding(ImageAdminBlockBuildingEvent $event)
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{
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global $user;
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if ($user->can(Permissions::DELETE_IMAGE)) {
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$event->add_part($this->theme->get_deleter_html($event->image->id));
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}
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/* In the future, could perhaps allow users to replace images that they own as well... */
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if ($user->can(Permissions::REPLACE_IMAGE)) {
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$event->add_part($this->theme->get_replace_html($event->image->id));
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}
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}
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public function onImageAddition(ImageAdditionEvent $event)
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{
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global $config;
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try {
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$image = $event->image;
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/*
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* Validate things
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*/
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if (strlen(trim($image->source ?? '')) == 0) {
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$image->source = null;
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}
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/*
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* Check for an existing image
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*/
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$existing = Image::by_hash($image->hash);
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if (!is_null($existing)) {
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$handler = $config->get_string(ImageConfig::UPLOAD_COLLISION_HANDLER);
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if ($handler == ImageConfig::COLLISION_MERGE || isset($_GET['update'])) {
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$merged = array_merge($image->get_tag_array(), $existing->get_tag_array());
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send_event(new TagSetEvent($existing, $merged));
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if (isset($_GET['rating']) && isset($_GET['update']) && Extension::is_enabled(RatingsInfo::KEY)) {
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send_event(new RatingSetEvent($existing, $_GET['rating']));
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}
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if (isset($_GET['source']) && isset($_GET['update'])) {
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send_event(new SourceSetEvent($existing, $_GET['source']));
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}
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$event->merged = true;
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$event->image = Image::by_id($existing->id);
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return;
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} else {
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$error = "Image <a href='".make_link("post/view/{$existing->id}")."'>{$existing->id}</a> ".
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"already has hash {$image->hash}:<p>".$this->theme->build_thumb_html($existing);
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throw new ImageAdditionException($error);
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}
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}
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// actually insert the info
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$image->save_to_db();
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log_info("image", "Uploaded Image #{$image->id} ({$image->hash})");
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# at this point in time, the image's tags haven't really been set,
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# and so, having $image->tag_array set to something is a lie (but
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# a useful one, as we want to know what the tags are /supposed/ to
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# be). Here we correct the lie, by first nullifying the wrong tags
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# then using the standard mechanism to set them properly.
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$tags_to_set = $image->get_tag_array();
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$image->tag_array = [];
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send_event(new TagSetEvent($image, $tags_to_set));
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if ($image->source !== null) {
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log_info("core-image", "Source for Image #{$image->id} set to: {$image->source}");
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}
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} catch (ImageAdditionException $e) {
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throw new UploadException($e->error);
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}
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}
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public function onImageDeletion(ImageDeletionEvent $event)
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{
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$event->image->delete();
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}
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public function onImageReplace(ImageReplaceEvent $event)
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{
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try {
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$id = $event->id;
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$image = $event->image;
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/* Check to make sure the image exists. */
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$existing = Image::by_id($id);
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if (is_null($existing)) {
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throw new ImageReplaceException("Image to replace does not exist!");
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}
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$duplicate = Image::by_hash($image->hash);
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if (!is_null($duplicate) && $duplicate->id!=$id) {
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$error = "Image <a href='" . make_link("post/view/{$duplicate->id}") . "'>{$duplicate->id}</a> " .
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"already has hash {$image->hash}:<p>" . $this->theme->build_thumb_html($duplicate);
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throw new ImageReplaceException($error);
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}
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if (strlen(trim($image->source)) == 0) {
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$image->source = $existing->get_source();
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}
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// Update the data in the database.
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$image->save_to_db();
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/*
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This step could be optional, ie: perhaps move the image somewhere
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and have it stored in a 'replaced images' list that could be
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inspected later by an admin?
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*/
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log_debug("image", "Removing image with hash " . $existing->hash);
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$existing->remove_image_only(); // Actually delete the old image file from disk
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/* Generate new thumbnail */
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send_event(new ThumbnailGenerationEvent($image->hash, strtolower($image->ext)));
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log_info("image", "Replaced Image #{$id} with ({$image->hash})");
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} catch (ImageReplaceException $e) {
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throw new UploadException($e->error);
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}
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}
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public function onUserPageBuilding(UserPageBuildingEvent $event)
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{
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$u_name = url_escape($event->display_user->name);
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$i_image_count = Image::count_images(["user={$event->display_user->name}"]);
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$i_days_old = ((time() - strtotime($event->display_user->join_date)) / 86400) + 1;
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$h_image_rate = sprintf("%.1f", ($i_image_count / $i_days_old));
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$images_link = make_link("post/list/user=$u_name/1");
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$event->add_stats("<a href='$images_link'>Images uploaded</a>: $i_image_count, $h_image_rate per day");
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}
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public function onSetupBuilding(SetupBuildingEvent $event)
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{
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$sb = new SetupBlock("Image Options");
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$sb->position = 30;
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// advanced only
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//$sb->add_text_option(ImageConfig::ILINK, "Image link: ");
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//$sb->add_text_option(ImageConfig::TLINK, "<br>Thumbnail link: ");
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$sb->add_text_option(ImageConfig::TIP, "Image tooltip: ");
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$sb->add_choice_option(ImageConfig::UPLOAD_COLLISION_HANDLER, self::COLLISION_OPTIONS, "<br>Upload collision handler: ");
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if (function_exists(self::EXIF_READ_FUNCTION)) {
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$sb->add_bool_option(ImageConfig::SHOW_META, "<br>Show metadata: ");
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}
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$event->panel->add_block($sb);
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$sb = new SetupBlock("Thumbnailing");
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$sb->add_choice_option(ImageConfig::THUMB_ENGINE, self::THUMBNAIL_ENGINES, "Engine: ");
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$sb->add_label("<br>");
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$sb->add_choice_option(ImageConfig::THUMB_TYPE, self::THUMBNAIL_TYPES, "Filetype: ");
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$sb->add_label("<br>Size ");
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$sb->add_int_option(ImageConfig::THUMB_WIDTH);
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$sb->add_label(" x ");
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$sb->add_int_option(ImageConfig::THUMB_HEIGHT);
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$sb->add_label(" px at ");
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$sb->add_int_option(ImageConfig::THUMB_QUALITY);
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$sb->add_label(" % quality ");
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$sb->add_label("<br>High-DPI scaling ");
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$sb->add_int_option(ImageConfig::THUMB_SCALING);
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$sb->add_label("%");
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$event->panel->add_block($sb);
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}
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private function send_file(int $image_id, string $type)
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{
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global $config;
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$image = Image::by_id($image_id);
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global $page;
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if (!is_null($image)) {
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if ($type == "thumb") {
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$ext = $config->get_string(ImageConfig::THUMB_TYPE);
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if (array_key_exists($ext, MIME_TYPE_MAP)) {
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$page->set_type(MIME_TYPE_MAP[$ext]);
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} else {
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$page->set_type("image/jpeg");
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}
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$file = $image->get_thumb_filename();
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} else {
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$page->set_type($image->get_mime_type());
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$file = $image->get_image_filename();
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}
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if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
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$if_modified_since = preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]);
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} else {
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$if_modified_since = "";
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}
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$gmdate_mod = gmdate('D, d M Y H:i:s', filemtime($file)) . ' GMT';
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if ($if_modified_since == $gmdate_mod) {
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$page->set_mode(PageMode::DATA);
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$page->set_code(304);
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$page->set_data("");
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} else {
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$page->set_mode(PageMode::FILE);
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$page->add_http_header("Last-Modified: $gmdate_mod");
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if ($type != "thumb") {
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$page->set_filename($image->get_nice_image_name(), 'inline');
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}
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$page->set_file($file);
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if ($config->get_int(ImageConfig::EXPIRES)) {
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$expires = date(DATE_RFC1123, time() + $config->get_int(ImageConfig::EXPIRES));
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} else {
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$expires = 'Fri, 2 Sep 2101 12:42:42 GMT'; // War was beginning
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}
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$page->add_http_header('Expires: ' . $expires);
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}
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} else {
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$page->set_title("Not Found");
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$page->set_heading("Not Found");
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$page->add_block(new Block("Navigation", "<a href='" . make_link() . "'>Index</a>", "left", 0));
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$page->add_block(new Block(
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"Image not in database",
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"The requested image was not found in the database"
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));
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}
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}
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}
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