411 lines
15 KiB
PHP
411 lines
15 KiB
PHP
<?php
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/*
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* Name: Transcode Image
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* Author: Matthew Barbour <matthew@darkholme.net>
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* Description: Allows admins to automatically and manually transcode images.
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* License: MIT
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* Version: 1.0
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* Documentation:
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* Can transcode on-demand and automatically on upload. Config screen allows choosing an output format for each of the supported input formats.
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* Supports GD and ImageMagick. Both support bmp, gif, jpg, png, and webp as inputs, and jpg, png, and lossy webp as outputs.
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* ImageMagick additionally supports tiff and psd inputs, and webp lossless output.
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* If and image is uanble to be transcoded for any reason, the upload will continue unaffected.
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*/
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class TranscodeConfig
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{
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const ENGINE = "transcode_engine";
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const ENABLED = "transcode_enabled";
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const UPLOAD = "transcode_upload";
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const UPLOAD_PREFIX = "transcode_upload_";
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const QUALITY = "transcode_quality";
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}
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/*
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* This is used by the image transcoding code when there is an error while transcoding
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*/
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class ImageTranscodeException extends SCoreException
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{
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}
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class TranscodeImage extends Extension
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{
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const ACTION_BULK_TRANSCODE = "bulk_transcode";
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const INPUT_FORMATS = [
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"BMP" => "bmp",
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"GIF" => "gif",
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"ICO" => "ico",
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"JPG" => "jpg",
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"PNG" => "png",
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"PSD" => "psd",
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"TIFF" => "tiff",
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"WEBP" => "webp",
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];
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const OUTPUT_FORMATS = [
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"" => "",
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"JPEG (lossy)" => "jpg",
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"PNG (lossless)" => "png",
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"WEBP (lossy)" => Media::WEBP_LOSSY,
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"WEBP (lossless)" => Media::WEBP_LOSSLESS,
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];
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/**
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* Needs to be after upload, but before the processing extensions
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*/
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public function get_priority(): int
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{
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return 45;
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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_bool(TranscodeConfig::ENABLED, true);
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$config->set_default_bool(TranscodeConfig::UPLOAD, false);
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$config->set_default_string(TranscodeConfig::ENGINE, MediaEngine::GD);
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$config->set_default_int(TranscodeConfig::QUALITY, 80);
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foreach (array_values(self::INPUT_FORMATS) as $format) {
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$config->set_default_string(TranscodeConfig::UPLOAD_PREFIX.$format, "");
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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, $config;
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if ($user->is_admin()) {
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$engine = $config->get_string(TranscodeConfig::ENGINE);
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if ($this->can_convert_format($engine, $event->image->ext, $event->image->lossless)) {
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$options = $this->get_supported_output_formats($engine, $event->image->ext, $event->image->lossless??false);
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$event->add_part($this->theme->get_transcode_html($event->image, $options));
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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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global $config;
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$engine = $config->get_string(TranscodeConfig::ENGINE);
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$sb = new SetupBlock("Image Transcode");
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$sb->start_table();
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$sb->add_bool_option(TranscodeConfig::ENABLED, "Allow transcoding images: ", true);
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$sb->add_bool_option(TranscodeConfig::UPLOAD, "Transcode on upload: ", true);
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$sb->add_choice_option(TranscodeConfig::ENGINE, Media::IMAGE_MEDIA_ENGINES, "Engine", true);
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foreach (self::INPUT_FORMATS as $display=>$format) {
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if (in_array($format, MediaEngine::INPUT_SUPPORT[$engine])) {
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$outputs = $this->get_supported_output_formats($engine, $format);
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$sb->add_choice_option(TranscodeConfig::UPLOAD_PREFIX.$format, $outputs, "$display", true);
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}
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}
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$sb->add_int_option(TranscodeConfig::QUALITY, "Lossy format quality: ");
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$sb->end_table();
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$event->panel->add_block($sb);
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}
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public function onDataUpload(DataUploadEvent $event)
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{
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global $config, $page;
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if ($config->get_bool(TranscodeConfig::UPLOAD) == true) {
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$ext = strtolower($event->type);
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$ext = Media::normalize_format($ext);
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if ($event->type=="gif"&&Media::is_animated_gif($event->tmpname)) {
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return;
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}
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if (in_array($ext, array_values(self::INPUT_FORMATS))) {
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$target_format = $config->get_string(TranscodeConfig::UPLOAD_PREFIX.$ext);
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if (empty($target_format)) {
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return;
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}
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try {
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$new_image = $this->transcode_image($event->tmpname, $ext, $target_format);
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$event->set_type(Media::determine_ext($target_format));
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$event->set_tmpname($new_image);
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} catch (Exception $e) {
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log_error("transcode", "Error while performing upload transcode: ".$e->getMessage());
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// We don't want to interfere with the upload process,
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// so if something goes wrong the untranscoded image jsut continues
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}
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}
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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 $page, $user;
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if ($event->page_matches("transcode") && $user->is_admin()) {
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$image_id = int_escape($event->get_arg(0));
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if (empty($image_id)) {
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$image_id = isset($_POST['image_id']) ? int_escape($_POST['image_id']) : null;
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}
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// Try to get the image ID
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if (empty($image_id)) {
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throw new ImageTranscodeException("Can not resize Image: No valid Image ID given.");
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}
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$image_obj = Image::by_id($image_id);
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if (is_null($image_obj)) {
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$this->theme->display_error(404, "Image not found", "No image in the database has the ID #$image_id");
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} else {
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if (isset($_POST['transcode_format'])) {
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try {
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$this->transcode_and_replace_image($image_obj, $_POST['transcode_format']);
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$page->set_mode(PageMode::REDIRECT);
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$page->set_redirect(make_link("post/view/".$image_id));
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} catch (ImageTranscodeException $e) {
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$this->theme->display_transcode_error($page, "Error Transcoding", $e->getMessage());
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}
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}
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}
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}
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}
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public function onBulkActionBlockBuilding(BulkActionBlockBuildingEvent $event)
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{
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global $user, $config;
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$engine = $config->get_string(TranscodeConfig::ENGINE);
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if ($user->is_admin()) {
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$event->add_action(self::ACTION_BULK_TRANSCODE, "Transcode", null,"", $this->theme->get_transcode_picker_html($this->get_supported_output_formats($engine)));
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}
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}
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public function onBulkAction(BulkActionEvent $event)
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{
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global $user, $database;
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switch ($event->action) {
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case self::ACTION_BULK_TRANSCODE:
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if (!isset($_POST['transcode_format'])) {
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return;
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}
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if ($user->is_admin()) {
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$format = $_POST['transcode_format'];
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$total = 0;
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foreach ($event->items as $image) {
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try {
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$database->beginTransaction();
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$this->transcode_and_replace_image($image, $format);
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// If a subsequent transcode fails, the database needs to have everything about the previous
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// transcodes recorded already, otherwise the image entries will be stuck pointing to
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// missing image files
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$database->commit();
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$total++;
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} catch (Exception $e) {
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log_error("transcode", "Error while bulk transcode on item $id to $format: ".$e->getMessage());
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try {
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$database->rollback();
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} catch (Exception $e) {
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}
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}
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}
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flash_message("Transcoded $total items");
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}
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break;
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}
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}
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private function can_convert_format($engine, $format, ?bool $lossless = null): bool
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{
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return Media::is_input_supported($engine, $format, $lossless);
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}
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private function get_supported_output_formats($engine, ?String $omit_format = null, ?bool $lossless = null): array
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{
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if($omit_format!=null) {
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$omit_format = Media::normalize_format($omit_format, $lossless);
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}
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$output = [];
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foreach (self::OUTPUT_FORMATS as $key=>$value) {
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if ($value=="") {
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$output[$key] = $value;
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continue;
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}
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if(Media::is_output_supported($engine, $value)
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&&(empty($omit_format)||$omit_format!=$value)) {
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$output[$key] = $value;
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}
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}
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return $output;
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}
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private function transcode_and_replace_image(Image $image_obj, String $target_format)
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{
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$original_file = warehouse_path(Image::IMAGE_DIR, $image_obj->hash);
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$tmp_filename = $this->transcode_image($original_file, $image_obj->ext, $target_format);
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$new_image = new Image();
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$new_image->hash = md5_file($tmp_filename);
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$new_image->filesize = filesize($tmp_filename);
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$new_image->filename = $image_obj->filename;
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$new_image->width = $image_obj->width;
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$new_image->height = $image_obj->height;
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$new_image->ext = Media::determine_ext($target_format);
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/* Move the new image into the main storage location */
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$target = warehouse_path(Image::IMAGE_DIR, $new_image->hash);
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if (!@copy($tmp_filename, $target)) {
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throw new ImageTranscodeException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
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}
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/* Remove temporary file */
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@unlink($tmp_filename);
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send_event(new ImageReplaceEvent($image_obj->id, $new_image));
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}
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private function transcode_image(String $source_name, String $source_format, string $target_format): string
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{
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global $config;
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if ($source_format==$target_format) {
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throw new ImageTranscodeException("Source and target formats are the same: ".$source_format);
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}
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$engine = $config->get_string("transcode_engine");
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if (!$this->can_convert_format($engine, $source_format)) {
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throw new ImageTranscodeException("Engine $engine does not support input format $source_format");
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}
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if (!in_array($target_format, MediaEngine::OUTPUT_SUPPORT[$engine])) {
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throw new ImageTranscodeException("Engine $engine does not support output format $target_format");
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}
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switch ($engine) {
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case "gd":
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return $this->transcode_image_gd($source_name, $source_format, $target_format);
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case "convert":
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return $this->transcode_image_convert($source_name, $source_format, $target_format);
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}
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}
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private function transcode_image_gd(String $source_name, String $source_format, string $target_format): string
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{
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global $config;
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$q = $config->get_int("transcode_quality");
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$tmp_name = tempnam("/tmp", "shimmie_transcode");
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$image = imagecreatefromstring(file_get_contents($source_name));
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try {
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$result = false;
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switch ($target_format) {
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case "webp":
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case Media::WEBP_LOSSY:
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$result = imagewebp($image, $tmp_name, $q);
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break;
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case "png":
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$result = imagepng($image, $tmp_name, 9);
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break;
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case "jpg":
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// In case of alpha channels
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$width = imagesx($image);
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$height = imagesy($image);
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$new_image = imagecreatetruecolor($width, $height);
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if ($new_image===false) {
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throw new ImageTranscodeException("Could not create image with dimensions $width x $height");
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}
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try {
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$black = imagecolorallocate($new_image, 0, 0, 0);
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if ($black===false) {
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throw new ImageTranscodeException("Could not allocate background color");
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}
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if (imagefilledrectangle($new_image, 0, 0, $width, $height, $black)===false) {
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throw new ImageTranscodeException("Could not fill background color");
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}
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if (imagecopy($new_image, $image, 0, 0, 0, 0, $width, $height)===false) {
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throw new ImageTranscodeException("Could not copy source image to new image");
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}
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$result = imagejpeg($new_image, $tmp_name, $q);
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} finally {
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imagedestroy($new_image);
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}
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break;
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}
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if ($result===false) {
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throw new ImageTranscodeException("Error while transcoding ".$source_name." to ".$target_format);
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}
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return $tmp_name;
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} finally {
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imagedestroy($image);
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}
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}
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private function transcode_image_convert(String $source_name, String $source_format, string $target_format): string
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{
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global $config;
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$q = $config->get_int("transcode_quality");
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$convert = $config->get_string(MediaConfig::CONVERT_PATH);
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if ($convert==null||$convert=="") {
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throw new ImageTranscodeException("ImageMagick path not configured");
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}
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$ext = Media::determine_ext($target_format);
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$args = " -flatten ";
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$bg = "none";
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switch ($target_format) {
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case Media::WEBP_LOSSLESS:
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$args .= '-define webp:lossless=true';
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break;
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case Media::WEBP_LOSSY:
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$args .= '';
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break;
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case "png":
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$args .= '-define png:compression-level=9';
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break;
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default:
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$bg = "black";
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break;
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}
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$tmp_name = tempnam("/tmp", "shimmie_transcode");
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$source_type = "";
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switch ($source_format) {
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case "ico":
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$source_type = "ico:";
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}
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$format = '"%s" %s -quality %u -background %s %s"%s" %s:"%s" 2>&1';
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$cmd = sprintf($format, $convert, $args, $q, $bg, $source_type, $source_name, $ext, $tmp_name);
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$cmd = str_replace("\"convert\"", "convert", $cmd); // quotes are only needed if the path to convert contains a space; some other times, quotes break things, see github bug #27
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exec($cmd, $output, $ret);
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log_debug('transcode', "Transcoding with command `$cmd`, returns $ret");
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if ($ret!==0) {
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throw new ImageTranscodeException("Transcoding failed with command ".$cmd.", returning ".implode("\r\n", $output));
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}
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return $tmp_name;
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}
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}
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