Spotify Web - Download Cover

Adds a button to download the full size cover art from Spotify Web Player

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// ==UserScript==
// @name                 Spotify Web - Download Cover
// @name:es              Spotify Web - Descargar portada
// @name:pt              Spotify Web - Descarregar capa
// @name:pt-BR           Spotify Web - Baixar capa
// @name:it              Spotify Web - Scarica copertina
// @name:fr              Spotify Web - Télécharger pochette
// @name:de              Spotify Web - Cover herunterladen
// @name:ru              Spotify Web - Скачать обложку
// @name:zh-CN           Spotify Web - 下载封面
// @name:ja              Spotify Web - カバーをダウンロード
// @namespace            http://tampermonkey.net/
// @description          Adds a button to download the full size cover art from Spotify Web Player
// @description:es       Agrega un botón para descargar la portada en tamaño completo del reproductor web de Spotify
// @description:pt       Adiciona um botão para baixar a capa em tamanho completo do reproductor web do Spotify
// @description:pt-BR    Adiciona um botão para baixar a capa em tamanho real do Spotify Web Player
// @description:it       Aggiunge un pulsante per scaricare la copertina a dimensione piena dal lettore web di Spotify
// @description:fr       Ajoute un bouton pour télécharger la pochette en taille réelle depuis le lecteur web Spotify
// @description:de       Fügt eine Schaltfläche zum Herunterladen des Covers in voller Größe vom Spotify Web Player hinzu
// @description:ru       Добавляет кнопку для скачивания обложки в полном размере из веб-плеера Spotify
// @description:zh-CN    为Spotify网页播放器添加下载全尺寸封面艺术的按钮
// @description:ja       Spotify Web Playerからフルサイズのカバーアートをダウンロードするボタンを追加します
// @version              1.6.1
// @match                https://open.spotify.com/*
// @author               Levi Somerset
// @license              MIT
// @icon                 https://www.google.com/s2/favicons?sz=64&domain=spotify.com
// @grant                GM_download
// @grant                GM_xmlhttpRequest
// @grant                window.onurlchange
// @connect              i.scdn.co
// @require              https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js
// ==/UserScript==

(function() {
    'use strict';

    const CONFIG = {
        COVER_BASE: 'https://i.scdn.co/image/',
        SIZES: ['ab67616d0000b273', 'ab67616d00001e02', 'ab67616d00004851'],
        FULL_SIZE: 'ab67616d000082c1',
        DEBOUNCE_DELAY: 300
    };

    const translations = {
        en: ['Download Cover', 'Cover downloaded: %s', 'Failed to download cover'],
        es: ['Descargar portada', 'Portada descargada: %s', 'No se pudo descargar la portada'],
        pt: ['Baixar capa', 'Capa baixada: %s', 'Falha ao baixar a capa'],
        "pt-BR": ['Baixar capa', 'Capa baixada: %s', 'Falha ao baixar a capa'],
        it: ['Scarica copertina', 'Copertina scaricata: %s', 'Impossibile scaricare la copertina'],
        fr: ['Télécharger pochette', 'Pochette téléchargée: %s', 'Échec du téléchargement de la pochette'],
        de: ['Cover herunterladen', 'Cover heruntergeladen: %s', 'Cover konnte nicht heruntergeladen werden'],
        ru: ['Скачать обложку', 'Обложка скачана: %s', 'Не удалось скачать обложку'],
        "zh-CN": ['下载封面', '封面已下载: %s', '下载封面失败'],
        ja: ['カバーをダウンロード', 'カバーがダウンロードされました: %s', 'カバーのダウンロードに失敗しました']
    };

    function initScript(saveAs) {
        let [buttonText, downloadedText, errorText] = translations.en;

        // Set language based on browser settings
        const lang = navigator.language.split('-')[0];
        if (lang in translations) {
            [buttonText, downloadedText, errorText] = translations[lang];
        }

        // Add styles
        const style = document.createElement('style');
        style.innerText = `
            .cover-download-btn {
                width: 32px;
                height: 32px;
                border-radius: 50%;
                border: 0;
                background-color: #1fdf64;
                background-image: url('data:image/svg+xml;utf8,<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120.59 122.88"><defs><style>.cls-1{fill-rule:evenodd;}</style></defs><title>download-image</title><path class="cls-1" d="M0,0H120.59V93.72H87.84V83.64H109.5V10.08H11.1V83.64H32.2V93.72H0V0ZM51.64,101.3V83.63H68.51V101.3H80.73L60.31,122.88,39.85,101.3ZM33.92,24.93a7.84,7.84,0,1,1-7.85,7.84,7.85,7.85,0,0,1,7.85-7.84Zm33,33.66L82.62,31.46,99.29,73.62H21.5V68.39L28,68.07l6.53-16,3.27,11.44h9.8l8.5-21.89,10.79,17Z"/></svg>');
                background-size: 20px 20px;
                background-position: center;
                background-repeat: no-repeat;
                cursor: pointer;
                margin-left: 10px;
            }
            .cover-download-btn:hover {
                transform: scale(1.1);
            }
        `;
        document.head.appendChild(style);

        function downloadImage(imageSrc, fileName) {
            return new Promise((resolve, reject) => {
                GM.xmlHttpRequest({
                    method: 'GET',
                    url: imageSrc,
                    responseType: 'blob',
                    onload: function(response) {
                        try {
                            const blob = response.response;
                            saveAs(blob, fileName);
                            showInfo(downloadedText.replace('%s', fileName), 'success');
                            resolve();
                        } catch (error) {
                            console.error('Error saving file:', error);
                            reject(error);
                        }
                    },
                    onerror: function(error) {
                        console.error('Error downloading image:', error);
                        reject(error);
                    }
                });
            });
        }

        const albumInfoCache = new Map();

        function getAlbumInfo() {
            const cacheKey = window.location.href;
            if (albumInfoCache.has(cacheKey)) {
                return albumInfoCache.get(cacheKey);
            }

            let artistName, albumName;

            // Desktop version
            const desktopArtistElements = document.querySelectorAll('div.Fb61sprjhh75aOITDnsJ a[data-testid="creator-link"]');
            if (desktopArtistElements.length > 0) {
                const artistNames = Array.from(desktopArtistElements).map(el => el.textContent.trim());
                artistName = artistNames.join(', ');
                albumName = document.querySelector('h1.encore-text.encore-text-headline-large.encore-internal-color-text-base[data-encore-id="text"]')?.textContent;
            }
            // Mobile version
            else {
                artistName = document.querySelector('.b81TNrTkVyPCOH0aDdLG a')?.textContent;
                albumName = document.querySelector('.gj6rSoF7K4FohS2DJDEm')?.textContent;
            }

            const info = {
                artist: artistName || 'Unknown Artist',
                album: albumName ? albumName.trim() : 'Unknown Album'
            };

            albumInfoCache.set(cacheKey, info);
            return info;
        }

        function findAlbumCover() {
            const albumPageSection = document.querySelector('section[data-testid="album-page"]');
            if (!albumPageSection) {
                return null;
            }

            let coverElement = albumPageSection.querySelector('img[srcset*="i.scdn.co/image/"][sizes]');

            if (!coverElement) {
                const albumLinks = albumPageSection.querySelectorAll('a[href^="/album/"]');
                for(let link of albumLinks) {
                    coverElement = link.closest('section').querySelector('img[srcset*="i.scdn.co/image/"][sizes]');
                    if (coverElement) {
                        break;
                    }
                }
            }

            if (!coverElement) {
                const modalButton = albumPageSection.querySelector('button[class*="osiFNXU9Cy1X0CYaU9Z"]');
                if (modalButton) {
                    coverElement = modalButton.querySelector('img[src*="i.scdn.co/image/"]');
                }
            }

            if (coverElement && coverElement.width >= 200) {
                return coverElement;
            }

            return null;
        }

        function getFullSizeCoverUrl() {
            const coverElement = findAlbumCover();

            if (!coverElement) {
                console.log('Cover element not found');
                return null;
            }

            const coverUrl = coverElement.src;
            for (const size of CONFIG.SIZES) {
                if (coverUrl.includes(size)) {
                    return coverUrl.replace(size, CONFIG.FULL_SIZE);
                }
            }

            console.log('Failed to extract cover hash');
            return null;
        }

        function debounce(func, delay) {
            let timeoutId;
            return function (...args) {
                clearTimeout(timeoutId);
                timeoutId = setTimeout(() => func.apply(this, args), delay);
            };
        }

        function shouldShowButton() {
            return window.location.pathname.startsWith('/album/');
        }

        function addDownloadButton() {
            if (!shouldShowButton()) return;

            let actionBarRow = document.querySelector('[data-testid="action-bar-row"]');

            // If desktop version's action bar is not found, try a mobile version
            if (!actionBarRow) {
                actionBarRow = document.querySelector('.jXbmfyIkvfBoDgVxAaDD');
            }

            if (actionBarRow && !actionBarRow.querySelector('.cover-download-btn')) {
                const downloadButton = document.createElement('button');
                downloadButton.classList.add('cover-download-btn');
                downloadButton.title = buttonText;
                downloadButton.addEventListener('click', async function() {
                    const fullSizeCoverUrl = getFullSizeCoverUrl();
                    if (fullSizeCoverUrl) {
                        try {
                            const albumInfo = getAlbumInfo();
                            const fileName = `${albumInfo.artist} - ${albumInfo.album}.jpg`;
                            await downloadImage(fullSizeCoverUrl, fileName);
                        } catch (error) {
                            showInfo(errorText, 'error');
                        }
                    } else {
                        showInfo(errorText, 'error');
                    }
                });

                actionBarRow.appendChild(downloadButton);
            }
        }

        function removeDownloadButton() {
            const existingButton = document.querySelector('.cover-download-btn');
            if (existingButton) {
                existingButton.remove();
            }
        }

        function addOrRemoveButton() {
            if (shouldShowButton()) {
                addDownloadButton();
            } else {
                removeDownloadButton();
            }
        }

        function showInfo(str, type = 'success') {
            const infoDiv = document.createElement('div');
            infoDiv.style.cssText = `
                position: fixed;
                bottom: 20px;
                left: 50%;
                transform: translateX(-50%);
                background-color: ${type === 'success' ? '#1db954' : '#ff4444'};
                color: white;
                padding: 10px 20px;
                border-radius: 5px;
                z-index: 9999;
            `;
            infoDiv.textContent = str;
            document.body.appendChild(infoDiv);
            setTimeout(() => infoDiv.remove(), 3000);
        }

        const debouncedAddOrRemoveButton = debounce(addOrRemoveButton, CONFIG.DEBOUNCE_DELAY);

        function init() {
            // Initial check
            addOrRemoveButton();

            // Listen for URL changes
            if ('onurlchange' in window) {
                window.addEventListener('urlchange', () => {
                    debouncedAddOrRemoveButton();
                });
            }

            // Observe DOM changes
            const observer = new MutationObserver(() => {
                debouncedAddOrRemoveButton();
            });

            observer.observe(document.body, {
                childList: true,
                subtree: true
            });

            // Listen for History API changes
            const originalPushState = history.pushState;
            history.pushState = function() {
                originalPushState.apply(this, arguments);
                debouncedAddOrRemoveButton();
            };

            window.addEventListener('popstate', debouncedAddOrRemoveButton);
        }

        init();
    }

    // Load FileSaver.js and initialize script
    if (typeof saveAs === 'undefined') {
        const script = document.createElement('script');
        script.src = 'https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js';
        script.onload = () => initScript(saveAs);
        document.head.appendChild(script);
    } else {
        initScript(saveAs);
    }
})();