art-museum/Album.php

<?php
/* Copyright (C) 2021  Alexander Rosenberg
 * This file is AGPL v3. See LICENSE file for more information
 */
class Album {
    private const PATH_PREFIX = 'albums';
    private const THUMB_PREFIX = 'thumbnails';
    private const NUMBER_REGEX = '/^[0-9]+(\\.[0-9]+)?$/';

    private $name;
    private $title;
    private $thumbnail;
    private $images;
    private $metadata;

    function __construct($name) {
        $this->name = $name;
        if (!file_exists($this->get_path())) {
            $this->invalidate();
        } else {
            $this->read();
        }
    }

    private function read() {
        $content = file_get_contents($this->get_path() . '/data.json');
        if ($content == null) {
            $this->invalidate();
            return;
        }
        $root = json_decode($content);
        if ($root == null) {
            $this->invalidate();
            return;
        }
        $this->title = $root->{'title'};
        $this->thumbnail = $root->{'thumbnail'};
        $this->images = $root->{'images'};
        $this->metadata = $root->{'metadata'};
    }

    private function invalidate() {
        $this->title = null;
        $this->thumbnail = null;
        $this->images = null;
    }

    function is_valid() {
        if ($this->title == null || $this->thumbnail == null || $this->images == null) {
            return false;
        }
        if (!is_string($this->title) || !is_string($this->thumbnail) || !is_array($this->images)) {
            return false;
        }
        foreach ($this->images as $image) {
            if (!is_string($image)) {
                return false;
            }
        }
        unset($image);
        return true;
    }

    function get_name() {
        return $this->name;
    }

    function get_path() {
        return $this::PATH_PREFIX . '/' . $this->name;
    }

    function get_title() {
        return $this->title;
    }

    function get_thumbnail() {
        return $this->get_path() . '/' . $this->thumbnail;
    }

    function get_small_thumbnail() {
        return $this::THUMB_PREFIX . '/small/' . $this->get_name() . '/' . $this->thumbnail;
    }

    function get_images() {
        return $this->images;
    }

    function get_html() {
        $out = '<a href="view.php?album=' . urlencode($this->get_name()) . '" class="album-wrapper">';
        if (file_exists($this->get_thumbnail())) {
            $type = mime_content_type($this->get_thumbnail());
        }
        $category = explode('/', $type)[0];
        if (!file_exists($this->get_thumbnail())) {
            $out .= '<img class="album-thumbnail" src="missing-image-icon.svg"/>';
        } else if ($category == 'audio') {
            $out .= '<img class="album-thumbnail" src="music-icon.svg"/>';
        } else {
            $out .= '<img class="album-thumbnail" src="' . htmlspecialchars($this->get_small_thumbnail(), ENT_QUOTES | ENT_HTML5) . '"/>';
        }
        $album_len = count($this->get_images());
        if ($album_len == 1) {
            $out .= '<div class="album-length">' . $album_len . ' Image</div>';
        } else {
            $out .= '<div class="album-length">' . $album_len . ' Images</div>';
        }
        $out .= '<div class="album-title">' . htmlspecialchars($this->get_title(), ENT_QUOTES | ENT_HTML5) . '</div>';
        $out .= '</a>';
        return $out;
    }


    function get_metadata($image) {
        if ($image == null || !in_array($image, $this->images)) {
            return null;
        }
        if ($this->metadata == null || !property_exists($this->metadata, $image)) {
            return [
                'description' => '',
                'date' => '',
                'time' => '',
                'latitude' => '',
                'longitude' => ''
            ];
        }
        $description = $this->metadata->{$image}->{'description'};
        $date = $this->metadata->{$image}->{'date'};
        $time = $this->metadata->{$image}->{'time'};
        $lat= $this->metadata->{$image}->{'latitude'};
        $lon = $this->metadata->{$image}->{'longitude'};
        if (preg_match($this::NUMBER_REGEX, $lat) === false || preg_match($this::NUMBER_REGEX, $lon) === false) {
            $lat = null;
            $lon = null;
        }
        return [
            'description' => $description == null ? '' : htmlspecialchars($description, ENT_QUOTES | ENT_HTML5),
            'date' => $date == null ? '' : htmlspecialchars($date, ENT_QUOTES | ENT_HTML5),
            'time' => $time == null ? '' : htmlspecialchars($time, ENT_QUOTES | ENT_HTML5),
            'latitude' => $lat == null ? '' : htmlspecialchars($lat, ENT_QUOTES | ENT_HTML5),
            'longitude' => $lon == null ? '' : htmlspecialchars($lon, ENT_QUOTES | ENT_HTML5)
        ];
    }

    function get_image_index($image) {
        for ($i = 0; $i < count($this->images); ++$i) {
            if ($image == $this->images[$i]) {
                return $i;
            }
        }
        return -1;
    }

    function get_image_entry($image) {
        if ($image == null || !in_array($image, $this->images)) {
            return null;
        }
        $index = $this->get_image_index($image);
        $rpath = $this->get_path() . '/' . $image;
        $path = htmlspecialchars($rpath);
        if (file_exists($rpath)) {
            $file_size = number_format(filesize($path));
            $rtype = mime_content_type($path);
        } else {
            $file_size = 0;
            $rtype = "Unknown";
        }
        $type = htmlspecialchars($rtype);
        $category = explode('/', $type)[0];
        $name = htmlspecialchars(basename($path));
        $metadata = $this->get_metadata($image);
        $entry = '<div class="sidebar-image-wrapper" onclick="set_main_image('
               . strval($index) . ')" ' . "data-size='$file_size' data-type='$type' data-name='$name' data-desc='"
               . $metadata['description'] . "' data-date='" . $metadata['date'] . "' data-time='" . $metadata['time'] . "' "
               . "data-lat='" . $metadata['latitude'] . "' data-lon='" . $metadata['longitude'] . "'>";
        if (!file_exists($rpath)) {
            $entry .= '<img style="display: none" class="sidebar-image" data-src="missing-image-icon.svg"/>';
        } else if ($category == 'video') {
            $thumb_name = htmlspecialchars($this->get_name() . '/' . $image);
            $entry .= '<img style="display: none" class="sidebar-image" ';
            $entry .= 'data-src="' . $thumb_name . '" ';
            $entry .= 'data-type="' . $type . '" ';
            $entry .= 'data-videopath="' . $path . '"/>';
        } else if ($category == 'audio') {
            $entry .= '<img class="sidebar-image" src="music-icon.svg" ';
            $entry .= 'data-audiotype="' . $type . '" ';
            $entry .= 'data-audiopath="' . $path . '"/>';
        } else {
            list($width, $height) = getimagesize($rpath);
            $path = htmlspecialchars($this->get_name() . '/' . $image);
            $entry .= '<img style="display: none" class="sidebar-image" data-src="' . $path . '" ' .
               'data-size="' . $width . 'x' . $height . '" />';
        }
        $entry .= '</div>';
        return $entry;
    }
}
?>