// ==UserScript==
// @name DOI & BibTeX & PDF Plugin
// @name:zh-CN DOI和BibTeX和PDF下载插件
// @description Adds buttons to copy DOI, fetch BibTeX citation, and download PDF from literature pages
// @description:zh-CN 添加按钮来复制DOI、获取文献的BibTeX引用格式并下载PDF
// @version 0.2 // Incremented version to reflect styling changes
// @author Yul
// @license MIT License
// @grant GM_setClipboard
// @grant GM_addStyle
// @grant GM_xmlhttpRequest
// @grant GM_download
// @run-at document-end
// @match *://www.astm.org/*
// @match *://www.scirp.org/journal/*
// @match *://direct.mit.edu/neco/*
// @match *://ieeexplore.ieee.org/*document/*
// @match *://ascelibrary.org/doi/*
// @match *://nhess.copernicus.org/articles/*
// @match *://www.cambridge.org/core/journals/*
// @match *://www.mdpi.com/*
// @match *://en.cgsjournals.com/article/doi/*
// @match *://adgeo.copernicus.org/articles/*
// @match *://papers.ssrn.com/*
// @match *://www.sciencedirect.com/science/article/*
// @match *://onlinelibrary.wiley.com/doi/*
// @match *://*.onlinelibrary.wiley.com/doi/*
// @match *://pubs.acs.org/doi/*
// @match *://www.tandfonline.com/doi/*
// @match *://www.beilstein-journals.org/*
// @match *://www.eurekaselect.com/*/article*
// @match *://*.springeropen.com/article*
// @match *://aip.scitation.org/doi/*
// @match *://www.nature.com/articles*
// @match *://*.sciencemag.org/content*
// @match *://journals.aps.org/*/abstract/10*
// @match *://www.nrcresearchpress.com/doi/10*
// @match *://iopscience.iop.org/article/10*
// @match *://www.cell.com/*/fulltext/*
// @match *://journals.lww.com/*
// @match *://*.biomedcentral.com/articles/*
// @match *://journals.sagepub.com/doi/*
// @match *://academic.oup.com/*/article/*
// @match *://www.karger.com/Article/*
// @match *://www.cambridge.org/core/journals/*/article/*
// @match *://www.annualreviews.org/doi/*
// @match *://www.jstage.jst.go.jp/article/*
// @match *://www.hindawi.com/journals/*
// @match *://www.cardiology.theclinics.com/article/*
// @match *://www.liebertpub.com/doi/*
// @match *://thorax.bmj.com/content/*
// @match *://journals.physiology.org/doi/*
// @match *://www.ahajournals.org/doi/*
// @match *://dl.acm.org/doi/*
// @match *://*.asm.org/content/*
// @match *://content.apa.org/*
// @match *://www.thelancet.com/journals/*/article/*
// @match *://jamanetwork.com/journals/*
// @match *://*.aacrjournals.org/content/*
// @match *://royalsocietypublishing.org/doi/*
// @match *://journals.plos.org/*/article*
// @match *://*.psychiatryonline.org/doi/*
// @match *://www.osapublishing.org/*/abstract.cfm*
// @match *://www.thieme-connect.de/products/ejournals/*
// @match *://journals.ametsoc.org/*/article/*
// @match *://www.frontiersin.org/articles/*
// @match *://www.worldscientific.com/doi/*
// @match *://www.nejm.org/doi/*
// @match *://ascopubs.org/doi/*
// @match *://www.jto.org/article/*
// @match *://www.jci.org/articles/*
// @match *://pubmed.ncbi.nlm.nih.gov/*
// @match *://www.spiedigitallibrary.org/conference-*
// @match *://www.ingentaconnect.com/content/*
// @match *://www.taylorfrancis.com/*
// @match *://www.science.org/doi/*
// @match *://www.scinapse.io/papers/*
// @match *://www.semanticscholar.org/paper/*
// @match *://www.researchgate.net/publication/*
// @match *://www.earthdoc.org/content/papers/*
// @match *://era.library.ualberta.ca/items*
// @match *://arxiv.org/abs/*
// @match *://asmedigitalcollection.asme.org/IPC*
// @match *://open.library.ubc.ca/soa/cIRcle/collections/*
// @match *://pubs.geoscienceworld.org/aeg/eeg/article/*
// @match *://othes.univie.ac.at/*
// @match *://www.atlantis-press.com/journals/*
// @match *://www.koreascience.or.kr/article/*
// @match *://www.geenmedical.com/article*
// @match *://www.ncbi.nlm.nih.gov/pmc/articles/*
// @match *://qjegh.lyellcollection.org/content/*
// @match *://cdnsciencepub.com/doi/*
// @match *://ojs.aaai.org//index.php/AAAI/article/*
// @match *://www.ijcai.org/proceedings/*
// @match *://www.scopus.com/record/display.uri*
// @match *://avs.scitation.org/doi/*
// @match *://pubs.rsc.org/*/content/*
// @match *://*.copernicus.org/articles/*
// @match *://europepmc.org/article/*
// @match *://www.futuremedicine.com/doi/*
// @include /^http[s]?:\/\/[\S\s]*webofscience[\S\s]+$/
// @include /^http[s]?:\/\/[\S\s]*springer[\S\s]*/(article|chapter)/
// @include /^http[s]?:\/\/[\S\s]*onepetro.org/[\S\s]+/(article|proceedings)/
// @namespace https://greasyforks.org/users/1479737
// ==/UserScript==
(function() {
'use strict';
// Configuration Constants
const CONFIG = {
MAX_RETRY: 15,
RETRY_INTERVAL: 300,
FEEDBACK_DURATION: 2000,
BIBTEX_TIMEOUT: 10000,
PDF_TIMEOUT: 15000, // For PDF access checks and other PDF operations
};
// BibTeX API Services
const BIBTEX_APIS = [
{
name: 'CrossRef',
url: (doi) => `https://api.crossref.org/works/${doi}/transform/application/x-bibtex`,
headers: {'Accept': 'application/x-bibtex'}
},
{
name: 'DOI.org',
url: (doi) => `https://doi.org/${doi}`,
headers: {'Accept': 'application/x-bibtex'}
},
{
name: 'Crosscite',
url: (doi) => `https://citation.crosscite.org/format?doi=${doi}&style=bibtex&lang=en-US`,
headers: {'Accept': 'text/plain'}
}
];
// PDF Download Link Selectors (prioritized)
const PDF_SELECTORS = {
'generic': [
'a[href$=".pdf"]', 'a[href*="/pdf/"]', 'a[href*="pdf"]',
'a[title*="PDF" i]', 'a[title*="Download" i]',
'.pdf-download a', '.download-pdf a', '.full-text-pdf a'
],
'specific': {
'www.nature.com': ['a[data-track-action="download pdf"]', 'a[href*="/pdf/"]', '.c-pdf-download__link'],
'ieeexplore.ieee.org': ['a[href*="stamp.jsp"]', '.pdf-btn a', 'a[href*="arnumber"][href*="pdf"]'],
'www.sciencedirect.com': ['a[pdfurl]', '.PdfDownloadButton', 'a[href*="pdfft"]', 'a[data-testid="pdf-link"]'],
'onlinelibrary.wiley.com': ['a[href*="pdf"]', '.doi-access a', '.pdf-download-btn', 'a[title*="PDF" i]'],
'link.springer.com': ['a[href*="pdf"]', '.pdf-link', '.c-pdf-download__link', 'a[data-track="click_pdf"]'],
'journals.plos.org': ['a[id*="downloadPdf"]', '.download a[href*="pdf"]', 'a[href*="article/file"]'],
'www.ncbi.nlm.nih.gov': ['a[href*="/pmc/articles/"][href*="/pdf/"]', '.pdf-link', 'a[title*="PDF" i]'],
'pubmed.ncbi.nlm.nih.gov': ['.full-text-links a[href*="pdf"]', 'a[data-ga-action="full_text"]'],
'journals.aps.org': ['a[href*="/pdf/"]', '.article-nav a[href*="pdf"]'],
'iopscience.iop.org': ['a[href*="/pdf/"]', '.pdf-download a'],
'www.tandfonline.com': ['a[href*="pdf"]', '.show-pdf a'],
'pubs.acs.org': ['a[href*="pdf"]', '.article-pdfLink'],
'academic.oup.com': ['a[href*="pdf"]', '.al-link-pdf'],
'www.mdpi.com': ['a[href*="pdf"]', '.download-pdf a'],
'www.frontiersin.org': ['a[href*="pdf"]', '.download-files a[href*="pdf"]']
}
};
// Site-Specific PDF URL Smart Extractors
const SITE_SPECIFIC_PDF_EXTRACTORS = {
'arxiv.org': () => window.location.pathname.match(/\/abs\/(.+)/) ? `https://arxiv.org/pdf/${window.location.pathname.match(/\/abs\/(.+)/)[1]}.pdf` : null,
'www.nature.com': () => {
const pdfLink = document.querySelector('a[data-track-action="download pdf"]');
if (pdfLink) return pdfLink.href;
const articleMatch = window.location.pathname.match(/\/articles\/([^\/]+)/);
return articleMatch ? `https://www.nature.com/articles/${articleMatch[1]}.pdf` : null;
},
'www.sciencedirect.com': () => {
const pdfBtn = document.querySelector('a[pdfurl]');
if (pdfBtn) return pdfBtn.getAttribute('pdfurl');
const scripts = document.querySelectorAll('script[type="application/json"]');
for (const script of scripts) {
try { if (JSON.parse(script.textContent)?.article?.pdfUrl) return JSON.parse(script.textContent).article.pdfUrl; } catch (e) { continue; }
}
return null;
},
'ieeexplore.ieee.org': () => {
const stampLink = document.querySelector('a[href*="stamp.jsp"]');
if (stampLink) return stampLink.href;
const arnumberMatch = window.location.search.match(/arnumber=(\d+)/);
return arnumberMatch ? `https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=${arnumberMatch[1]}` : null;
},
'onlinelibrary.wiley.com': () => {
const pdfLink = document.querySelector('a[href*="pdf"][title*="PDF"]'); // More specific
if (pdfLink) return pdfLink.href;
const doiMatch = window.location.pathname.match(/\/doi\/(10\..+)/);
return doiMatch ? `https://onlinelibrary.wiley.com/doi/pdf/${doiMatch[1]}` : null;
},
'www.ncbi.nlm.nih.gov': () => {
if (window.location.pathname.includes('/pmc/articles/')) {
const pmcMatch = window.location.pathname.match(/(PMC\d+)/);
return pmcMatch ? `https://www.ncbi.nlm.nih.gov/pmc/articles/${pmcMatch[1]}/pdf/` : null;
}
return null;
},
'journals.plos.org': () => {
const pdfLink = document.querySelector('a[id*="downloadPdf"]');
if (pdfLink) return pdfLink.href;
const doiMatch = window.location.search.match(/id=(10\..+)/); // Assuming ID is DOI
return doiMatch ? `https://journals.plos.org/plosone/article/file?id=${doiMatch[1]}&type=printable` : null;
},
'link.springer.com': () => {
const pdfLink = document.querySelector('a.c-pdf-download__link, a[data-track="click_pdf"][href*="pdf"]');
if (pdfLink) return pdfLink.href;
const doiMatch = window.location.pathname.match(/\/(10\.[^/]+\/[^/]+)/);
return doiMatch ? `https://link.springer.com/content/pdf/${doiMatch[1]}.pdf` : null;
}
};
// State Management
let state = {
timer: null,
retryCount: 0,
currentDOI: null,
currentPDFUrl: null,
widget: null,
bibtexCache: new Map(),
pdfCache: new Map()
};
// DOI Extraction Rules
const DOI_SELECTORS = [
'meta[name="citation_doi"]', 'meta[name="dc.identifier"][scheme="DOI"]',
'meta[name="dc.Identifier"][scheme="DOI"]', 'meta[name="DC.identifier"][scheme="DOI"]',
'meta[name="dc.identifier"]', 'meta[name="dc.Identifier"]', 'meta[name="DC.identifier"]',
'meta[property="og:url"]'
];
const SITE_SPECIFIC_EXTRACTORS = { // For DOI
'ieeexplore.ieee.org': () => document.querySelector('div.stats-document-abstract-doi a')?.textContent,
'www.sciencedirect.com': () => {
const script = document.querySelector('script[type="application/json"][data-iso-key="_0"]');
if (script?.textContent) { try { return JSON.parse(script.textContent)?.article?.doi; } catch (e) { console.warn('Failed to parse ScienceDirect JSON for DOI:', e); } }
},
'www.researchgate.net': () => document.querySelector("div.research-detail-meta-item a[href*='doi.org/10.'], div.js-publication-details a[href*='doi.org/10.']")?.href,
'www.webofscience.com': () => document.querySelector('#FullRTa-DOI, app-full-record-summary-item[data-test-id="summary-DOI"] .value')?.textContent,
'pubmed.ncbi.nlm.nih.gov': () => document.querySelector('span.citation-doi a, a.id-link[data-ga-action="DOI"]')?.textContent,
'www.ncbi.nlm.nih.gov': () => window.location.pathname.includes('/pmc/articles/') ? document.querySelector('td.doi a, span.doi a')?.textContent : null,
'arxiv.org': () => document.querySelector('td.tablecell.doi a, div.submission-history dt:contains("DOI:") + dd, div.extra-services div.full-text ul li a[href*="doi.org/10."]')?.textContent || document.querySelector('div.extra-services div.full-text ul li a[href*="doi.org/10."]')?.href,
'www.semanticscholar.org': () => document.querySelector('span[data-test-id="paper-doi"] a')?.href || document.querySelector('[data-test-id="paper-meta-item"] a[href*="doi.org"]')?.textContent
};
// Utility Functions
const utils = {
normalizeHostname: (hostname) => {
if (hostname.includes('webofscience')) return 'www.webofscience.com';
if (hostname.includes('springer.com') || hostname.includes('springerlink.com')) return 'link.springer.com';
if (hostname.includes('onlinelibrary.wiley.com')) return 'onlinelibrary.wiley.com';
return hostname;
},
normalizeDOI: (doi) => {
if (!doi) return null;
let normalized = decodeURIComponent(doi.toString().trim()).replace(/^doi:\s*/i, '').replace(/^https?:\/\/doi\.org\//i, '');
const strictMatch = normalized.match(/10\.\d{4,9}\/[-._;()/:A-Z0-9]+$/i);
if (strictMatch) return strictMatch[0];
const looseMatch = normalized.match(/10\.[^\s]+/);
return looseMatch && normalized.startsWith("10.") ? looseMatch[0] : null;
},
debounce: (func, delay) => {
let timeoutId;
return (...args) => { clearTimeout(timeoutId); timeoutId = setTimeout(() => func.apply(null, args), delay); };
},
cleanBibTeX: (bibtex) => {
if (!bibtex) return null;
return bibtex.replace(/^\s+|\s+$/g, '').replace(/\n\s*\n/g, '\n').replace(/\s+/g, ' ').replace(/,\s*}/g, '\n}').replace(/,\s*([a-zA-Z])/g, ',\n $1');
},
generatePDFFilename: (doi, title) => {
let filename = '';
if (title) { filename = title.replace(/[^\w\s-]/g, '').replace(/\s+/g, '_').substring(0, 50); }
else if (doi) { filename = doi.replace(/[/\\:*?"<>|]/g, '_'); }
else { filename = `paper_${Date.now()}`; }
return `${filename}.pdf`;
},
isValidPDFUrl: (url) => {
if (!url) return false;
try { new URL(url, window.location.href); } catch { return false; }
const excludePatterns = [/\.(jpg|jpeg|png|gif|svg|css|js|html)$/i, /javascript:/i, /mailto:/i, /#$/];
return !excludePatterns.some(pattern => pattern.test(url));
},
checkPDFAccess: async (url) => {
return new Promise((resolve) => {
GM_xmlhttpRequest({
method: 'HEAD', url: url, timeout: CONFIG.PDF_TIMEOUT / 3, // Shorter timeout for HEAD
onload: (response) => {
const isAccessible = response.status === 200 || response.status === 302;
const contentType = response.responseHeaders?.toLowerCase() || "";
const isPDF = contentType.includes('application/pdf') || url.toLowerCase().endsWith('.pdf');
resolve(isAccessible && isPDF);
},
onerror: () => resolve(false), ontimeout: () => resolve(false)
});
});
}
};
// DOI Extractor
const extractDOI = () => {
const hostname = utils.normalizeHostname(window.location.hostname);
const siteExtractor = SITE_SPECIFIC_EXTRACTORS[hostname];
if (siteExtractor) { const doi = siteExtractor(); if (doi) return utils.normalizeDOI(doi); }
for (const selector of DOI_SELECTORS) {
const element = document.querySelector(selector);
if (element?.content) { const doi = utils.normalizeDOI(element.content); if (doi) return doi; }
}
const doiLink = document.querySelector('a[href*="doi.org/10."]');
if (doiLink?.href) return utils.normalizeDOI(doiLink.href);
return null;
};
// BibTeX Fetching
const fetchBibTeX = async (doi) => {
if (state.bibtexCache.has(doi)) return state.bibtexCache.get(doi);
for (const api of BIBTEX_APIS) {
try {
const result = await new Promise((resolve, reject) => {
const timeout = setTimeout(() => reject(new Error('Timeout')), CONFIG.BIBTEX_TIMEOUT);
GM_xmlhttpRequest({
method: 'GET', url: api.url(doi), headers: api.headers, timeout: CONFIG.BIBTEX_TIMEOUT,
onload: (response) => {
clearTimeout(timeout);
if (response.status === 200 && response.responseText) {
const cleaned = utils.cleanBibTeX(response.responseText);
if (cleaned && cleaned.includes('@')) resolve(cleaned); else reject(new Error('Invalid BibTeX format'));
} else reject(new Error(`HTTP ${response.status}`));
},
onerror: (error) => { clearTimeout(timeout); reject(error); },
ontimeout: () => { clearTimeout(timeout); reject(new Error('Request timeout')); }
});
});
state.bibtexCache.set(doi, result); console.log(`BibTeX fetched successfully from ${api.name}`); return result;
} catch (error) { console.warn(`${api.name} failed:`, error.message); continue; }
}
throw new Error('All BibTeX APIs failed');
};
// --- PDF Specific Functions ---
const findBestPDFUrl = async () => {
const hostname = utils.normalizeHostname(window.location.hostname);
const candidates = [];
const sitePdfExtractor = SITE_SPECIFIC_PDF_EXTRACTORS[hostname];
if (sitePdfExtractor) { const url = sitePdfExtractor(); if (url && utils.isValidPDFUrl(url)) candidates.push({ url, priority: 10, source: 'site-specific-extractor' });}
const siteSelectors = PDF_SELECTORS.specific[hostname];
if (siteSelectors) {
for (let i = 0; i < siteSelectors.length; i++) {
try {
document.querySelectorAll(siteSelectors[i]).forEach(el => {
const url = el.href || el.getAttribute('pdfurl') || el.getAttribute('data-pdf-url');
if (url && utils.isValidPDFUrl(url)) candidates.push({ url, priority: 9 - i, source: `site-selector: ${siteSelectors[i]}`});
});
} catch (e) { console.warn(`PDF selector failed: ${siteSelectors[i]}`, e); }
}
}
PDF_SELECTORS.generic.forEach((selector, index) => {
try {
document.querySelectorAll(selector).forEach(el => {
const url = el.href || el.getAttribute('pdfurl');
if (url && utils.isValidPDFUrl(url)) {
let priority = 6 - index;
if (url.toLowerCase().includes('pdf') || url.endsWith('.pdf')) priority += 2;
const text = el.textContent?.toLowerCase() || '';
if (text.includes('pdf') || text.includes('download')) priority += 1;
candidates.push({ url, priority, source: `generic: ${selector}`});
}
});
} catch (e) { console.warn(`Generic PDF selector failed: ${selector}`, e); }
});
if (state.currentDOI) {
generateDOIBasedPDFUrls(state.currentDOI).forEach(url => candidates.push({ url, priority: 3, source: 'doi-based' }));
}
candidates.sort((a, b) => b.priority - a.priority);
const uniqueCandidates = Array.from(new Map(candidates.map(c => [c.url, c])).values());
console.log('PDF candidates found:', uniqueCandidates.map(c => `${c.url} (P:${c.priority}, S:${c.source})`));
for (const candidate of uniqueCandidates.slice(0, 5)) { // Check top 5
if (await utils.checkPDFAccess(candidate.url)) { console.log(`Best PDF URL selected (accessible): ${candidate.url} (${candidate.source})`); return candidate.url; }
}
return uniqueCandidates.length > 0 ? uniqueCandidates[0].url : null; // Fallback to highest priority if none are confirmed accessible
};
const generateDOIBasedPDFUrls = (doi) => { // Simplified
if (!doi) return [];
const doiParts = doi.split('/');
const suffix = doiParts.length > 1 ? doiParts[1] : doi;
return [
`https://www.nature.com/articles/${suffix}.pdf`,
`https://link.springer.com/content/pdf/${doi}.pdf`,
`https://onlinelibrary.wiley.com/doi/pdf/${doi}`
// Add more patterns if known and reliable
].filter(url => utils.isValidPDFUrl(url));
};
const deepScanForPDF = () => {
const potentialLinks = [];
document.querySelectorAll('a[href]').forEach(link => {
const href = link.href.toLowerCase(); const text = link.textContent.toLowerCase();
const pdfKeywords = ['pdf', 'download', 'full text', 'full-text', 'view pdf', 'get pdf'];
if (pdfKeywords.some(k => href.includes(k) || text.includes(k)) && utils.isValidPDFUrl(link.href)) {
let score = 1;
if (href.endsWith('.pdf')) score += 5; if (href.includes('/pdf/')) score += 3;
if (text.includes('pdf')) score += 2; if (text.includes('download')) score += 2;
if (link.download) score += 3;
potentialLinks.push({ url: link.href, score });
}
});
potentialLinks.sort((a, b) => b.score - a.score);
return potentialLinks.length > 0 ? potentialLinks[0].url : null;
};
const heuristicPDFSearch = async () => {
const embeds = document.querySelectorAll('embed[src*="pdf"], object[data*="pdf"], iframe[src*="pdf"]');
for (const embed of embeds) { const src = embed.src || embed.data; if (src && utils.isValidPDFUrl(src)) return src; }
const scripts = document.querySelectorAll('script:not([src])');
for (const script of scripts) {
const text = script.textContent; const pdfMatches = text.match(/["'](https?:\/\/[^"']*\.pdf[^"']*?)["']/gi);
if (pdfMatches) { for (const match of pdfMatches) { const url = match.slice(1, -1); if (utils.isValidPDFUrl(url)) return url; } }
}
const dataElements = document.querySelectorAll('[data-pdf-url], [data-download-url], [data-file-url]');
for (const el of dataElements) { const url = el.dataset.pdfUrl || el.dataset.downloadUrl || el.dataset.fileUrl; if (url && utils.isValidPDFUrl(url)) return url; }
return null;
};
const downloadPDF = async (pdfUrl, button) => {
if (!pdfUrl) { showCopyFeedback(button, '无PDF链接', true); return; }
try {
const title = document.querySelector('meta[name="citation_title"]')?.content || document.querySelector('h1')?.textContent || document.title;
const filename = utils.generatePDFFilename(state.currentDOI, title);
if (typeof GM_download !== 'undefined') {
GM_download({ url: pdfUrl, name: filename, saveAs: true }); // saveAs: true to prompt user
showCopyFeedback(button, '下载中...', false); console.log(`Downloading PDF: ${pdfUrl} as ${filename}`); return;
}
const link = document.createElement('a'); link.href = pdfUrl; link.download = filename; link.target = '_blank';
document.body.appendChild(link); link.click(); document.body.removeChild(link);
showCopyFeedback(button, '已启动下载', false); console.log(`PDF download initiated: ${pdfUrl}`);
} catch (error) { console.error('PDF download failed:', error); showCopyFeedback(button, '下载失败', true); }
};
const enhancedDownloadPDF = async (button) => {
const originalText = button.textContent;
button.textContent = 'PDF'; button.disabled = true;
try {
let pdfUrl = state.currentPDFUrl || state.pdfCache.get(window.location.href);
if (!pdfUrl) pdfUrl = await findBestPDFUrl();
if (!pdfUrl) pdfUrl = deepScanForPDF();
if (!pdfUrl) pdfUrl = await heuristicPDFSearch();
if (pdfUrl) {
state.currentPDFUrl = pdfUrl; state.pdfCache.set(window.location.href, pdfUrl);
await downloadPDF(pdfUrl, button); // This will call showCopyFeedback
} else {
showCopyFeedback(button, '未找到PDF', true); // This restores button
}
} catch (error) {
console.error('Enhanced PDF download failed:', error);
showCopyFeedback(button, 'PDF错误', true); // This restores button
}
// If showCopyFeedback was called, button state is handled.
// If an error occurred before showCopyFeedback, or if it didn't restore for some reason:
if (button.textContent === 'PDF') { // Check if it's still in intermediate state
button.textContent = originalText;
button.disabled = false;
}
};
// --- End PDF Specific Functions ---
// Clipboard Operations
const copyToClipboard = async (text, button, successMsg = 'Copied') => {
try {
if (typeof GM_setClipboard !== 'undefined') { GM_setClipboard(text); showCopyFeedback(button, successMsg); return; }
if (navigator.clipboard?.writeText) { await navigator.clipboard.writeText(text); showCopyFeedback(button, successMsg); return; }
throw new Error('No clipboard API available');
} catch (error) { console.error('Failed to copy:', error); showCopyFeedback(button, '复制失败', true); }
};
// Feedback Display
const showCopyFeedback = (button, message, isError = false) => {
if (!button) return;
const originalText = button.dataset.originalText || button.textContent; // Store original text if not already
if (!button.dataset.originalText) button.dataset.originalText = button.textContent;
button.textContent = message;
const baseClass = button.className.replace(/ copied-feedback| error-feedback/g, '');
button.className = baseClass + (isError ? ' error-feedback' : ' copied-feedback');
button.disabled = true;
setTimeout(() => {
button.textContent = originalText;
button.className = baseClass;
button.disabled = false;
delete button.dataset.originalText; // Clean up
}, CONFIG.FEEDBACK_DURATION);
};
// BibTeX Button Click Handler
const handleBibTeXClick = async (button) => {
if (!state.currentDOI) { showCopyFeedback(button, '无DOI', true); return; }
const originalText = button.textContent;
button.textContent = 'BibTeX';
button.disabled = true;
try {
const bibtex = await fetchBibTeX(state.currentDOI);
await copyToClipboard(bibtex, button, 'BibTeX已复制'); // copyToClipboard calls showCopyFeedback
} catch (error) {
console.error('Failed to fetch BibTeX:', error);
showCopyFeedback(button, '获取失败', true); // This will restore button
}
// If button text is still "获取BibTeX...", restore it (e.g. if copyToClipboard failed silently before its own showCopyFeedback)
if (button.textContent === 'BibTeX') {
button.textContent = originalText;
button.disabled = false;
}
};
// UI Styling
const createStyles = () => {
GM_addStyle(`
#doi-widget-container {
position: fixed; bottom: 20px; right: 20px;
background-color: #0C344E; border-radius: 12px;
box-shadow: 0 4px 20px rgba(0,0,0,0.15); z-index: 2147483647;
display: none; overflow: hidden; text-align: center; color: white;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
min-width: 100px; /* Adjusted min-width for potentially longer text */
}
.widget-button {
display: block; width: 100%; padding: 10px 15px;
font-size: 14px; font-weight: 600; color: white;
border: none; cursor: pointer; transition: all 0.2s ease;
outline: none; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.widget-button:last-of-type { border-bottom: none; } /* Applies to last button before copyright */
#doi-widget-button { background-color: #118ab2; border-radius: 12px 12px 0 0; }
#doi-widget-button:hover { background-color: #0f7ea1; transform: translateY(-1px); }
#bibtex-widget-button { background-color: #06d6a0; border-radius: 0; }
#bibtex-widget-button:hover { background-color: #05c290; transform: translateY(-1px); }
#pdf-widget-button { background-color: #ff9f1c; border-radius: 0; } /* Orange for PDF */
#pdf-widget-button:hover { background-color: #e68a00; transform: translateY(-1px); } /* Darker orange */
.widget-button:active { transform: scale(0.98); }
.widget-button:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }
.widget-button.copied-feedback { background-color: #28a745 !important; }
.widget-button.error-feedback { background-color: #dc3545 !important; }
#doi-widget-copyright {
padding: 8px 12px; font-size: 11px; background-color: #0C344E;
color: #a0d8ef; border-radius: 0 0 12px 12px;
}
@media (max-width: 768px) {
#doi-widget-container { bottom: 15px; right: 15px; min-width: 90px; }
.widget-button { padding: 10px 12px; font-size: 13px; }
}
`);
};
// UI Widget Creation
const createWidget = () => {
if (document.getElementById('doi-widget-container')) return;
const container = document.createElement('div'); container.id = 'doi-widget-container';
const doiButton = document.createElement('button');
doiButton.id = 'doi-widget-button'; doiButton.className = 'widget-button';
doiButton.textContent = 'DOI'; doiButton.title = '点击复制 DOI';
doiButton.addEventListener('click', () => { if (state.currentDOI) copyToClipboard(state.currentDOI, doiButton, 'DOI已复制'); else showCopyFeedback(doiButton, '无DOI', true); });
const bibtexButton = document.createElement('button');
bibtexButton.id = 'bibtex-widget-button'; bibtexButton.className = 'widget-button';
bibtexButton.textContent = 'BibTeX'; bibtexButton.title = '点击获取并复制 BibTeX';
bibtexButton.addEventListener('click', () => handleBibTeXClick(bibtexButton));
const pdfButton = document.createElement('button');
pdfButton.id = 'pdf-widget-button'; pdfButton.className = 'widget-button';
pdfButton.textContent = 'PDF'; pdfButton.title = '点击下载 PDF';
pdfButton.addEventListener('click', () => enhancedDownloadPDF(pdfButton));
const copyright = document.createElement('div');
copyright.id = 'doi-widget-copyright'; copyright.textContent = `Yul © ${new Date().getFullYear()}`;
container.appendChild(doiButton); container.appendChild(bibtexButton); container.appendChild(pdfButton);
container.appendChild(copyright);
document.body.appendChild(container);
state.widget = container;
};
// Widget Visibility Control
const showWidget = () => { if (state.widget) state.widget.style.display = 'block'; };
const hideWidget = () => { if (state.widget) state.widget.style.display = 'none'; };
// DOI Detection and Widget Activation
const attemptExtractDOI = () => {
state.retryCount++; const doi = extractDOI();
if (doi) {
clearInterval(state.timer); state.currentDOI = doi; console.log('DOI found:', doi);
// Pre-fetch PDF URL in background if DOI is found
findBestPDFUrl().then(pdfUrl => { if (pdfUrl) { state.currentPDFUrl = pdfUrl; state.pdfCache.set(window.location.href, pdfUrl); console.log('PDF URL pre-extracted:', pdfUrl);}});
showWidget();
} else if (state.retryCount >= CONFIG.MAX_RETRY) {
clearInterval(state.timer); console.log('DOI not found after', CONFIG.MAX_RETRY, 'attempts');
// Optionally show widget even if DOI not found, for PDF download attempts
// For now, keeping original behavior: hide if no DOI. PDF button will rely on page scan.
// To enable PDF button even without DOI, call showWidget() here or make it always visible.
// For this modification, let's keep it tied to DOI presence for consistency with original style.
// If you want PDF to always be available, remove hideWidget() or call showWidget()
hideWidget(); // Original behavior
}
};
const resetAndStart = utils.debounce(() => {
console.log('DOI & BibTeX & PDF Plugin: Initializing/Resetting...');
if (state.timer) clearInterval(state.timer);
state.retryCount = 0; state.currentDOI = null; state.currentPDFUrl = null; // Reset PDF URL too
// Do not hide widget immediately, attemptExtractDOI will manage visibility
// hideWidget(); // This would hide it on SPA navigation before DOI is found
state.timer = setInterval(attemptExtractDOI, CONFIG.RETRY_INTERVAL);
attemptExtractDOI(); // Try once immediately
}, 250); // Slightly shorter debounce for SPA
// Navigation and Mutation Observer
const setupNavigationListener = () => {
const originalPushState = history.pushState; const originalReplaceState = history.replaceState;
history.pushState = function(...args) { originalPushState.apply(this, args); resetAndStart(); };
history.replaceState = function(...args) { originalReplaceState.apply(this, args); resetAndStart(); };
window.addEventListener('popstate', resetAndStart);
if (window.MutationObserver) {
const observer = new MutationObserver(utils.debounce(() => {
// Only reset if DOI is not found or URL changed significantly
// This prevents excessive resets on minor DOM changes
if (!state.currentDOI || state.lastObservedURL !== window.location.href) {
state.lastObservedURL = window.location.href;
resetAndStart();
}
}, 1000));
observer.observe(document.body, { childList: true, subtree: true });
state.lastObservedURL = window.location.href; // Initialize
}
};
// Initialization
const init = () => {
createStyles();
createWidget(); // Creates the widget but it's hidden by default CSS
setupNavigationListener();
resetAndStart(); // This will attempt to find DOI and show/hide widget
};
// Script Execution Start
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
})();
