feat: add PDF generation and download feature
- Introduced dependency management with Composer for easier package handling. - Added TCPDF library to generate PDFs of articles. - Implemented PDF download functionality via a custom endpoint. - Included admin notices to ensure Composer dependencies are installed. - Updated single article view with a download button for PDFs.
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5 changed files with 212 additions and 9 deletions
2
.gitignore
vendored
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2
.gitignore
vendored
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@ -0,0 +1,2 @@
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composer.phar
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vendor/
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5
composer.json
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composer.json
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{
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"require": {
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"tecnickcom/tcpdf": "^6.7"
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}
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}
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91
composer.lock
generated
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91
composer.lock
generated
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@ -0,0 +1,91 @@
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{
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"_readme": [
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"This file locks the dependencies of your project to a known state",
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"Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
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"This file is @generated automatically"
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],
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"content-hash": "a607f866b3f01ae9ad4f413456987bbb",
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"packages": [
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{
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"name": "tecnickcom/tcpdf",
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"version": "6.7.5",
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"source": {
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"type": "git",
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"url": "https://github.com/tecnickcom/TCPDF.git",
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"reference": "951eabf0338ec2522bd0d5d9c79b08a3a3d36b36"
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},
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"dist": {
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"type": "zip",
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"url": "https://api.github.com/repos/tecnickcom/TCPDF/zipball/951eabf0338ec2522bd0d5d9c79b08a3a3d36b36",
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"reference": "951eabf0338ec2522bd0d5d9c79b08a3a3d36b36",
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"shasum": ""
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},
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"require": {
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"php": ">=5.5.0"
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},
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"type": "library",
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"autoload": {
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"classmap": [
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"config",
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"include",
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"tcpdf.php",
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"tcpdf_parser.php",
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"tcpdf_import.php",
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"tcpdf_barcodes_1d.php",
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"tcpdf_barcodes_2d.php",
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"include/tcpdf_colors.php",
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"include/tcpdf_filters.php",
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"include/tcpdf_font_data.php",
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"include/tcpdf_fonts.php",
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"include/tcpdf_images.php",
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"include/tcpdf_static.php",
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"include/barcodes/datamatrix.php",
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"include/barcodes/pdf417.php",
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"include/barcodes/qrcode.php"
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]
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},
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"notification-url": "https://packagist.org/downloads/",
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"license": [
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"LGPL-3.0-or-later"
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],
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"authors": [
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{
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"name": "Nicola Asuni",
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"email": "info@tecnick.com",
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"role": "lead"
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}
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],
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"description": "TCPDF is a PHP class for generating PDF documents and barcodes.",
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"homepage": "http://www.tcpdf.org/",
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"keywords": [
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"PDFD32000-2008",
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"TCPDF",
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"barcodes",
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"datamatrix",
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"pdf",
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"pdf417",
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"qrcode"
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],
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"support": {
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"issues": "https://github.com/tecnickcom/TCPDF/issues",
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"source": "https://github.com/tecnickcom/TCPDF/tree/6.7.5"
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},
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"funding": [
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{
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"url": "https://www.paypal.com/cgi-bin/webscr?cmd=_donations¤cy_code=GBP&business=paypal@tecnick.com&item_name=donation%20for%20tcpdf%20project",
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"type": "custom"
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}
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],
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"time": "2024-04-20T17:25:10+00:00"
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}
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],
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"packages-dev": [],
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"aliases": [],
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"minimum-stability": "stable",
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"stability-flags": [],
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"prefer-stable": false,
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"prefer-lowest": false,
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"platform": [],
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"platform-dev": [],
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"plugin-api-version": "2.6.0"
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}
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102
functions.php
102
functions.php
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@ -721,3 +721,105 @@ function custom_login_logo_url_title()
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}
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add_filter('login_headertext', 'custom_login_logo_url_title');
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// Check if TCPDF is available
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function is_tcpdf_available()
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{
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return class_exists('TCPDF');
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}
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// Check if the Composer autoloader is available
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function is_autoloader_available()
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{
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return file_exists(get_template_directory() . '/vendor/autoload.php');
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}
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// Display admin notice if TCPDF or autoloader is missing
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function tcpdf_missing_notice()
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{
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if (!is_autoloader_available()) {
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echo '<div class="notice notice-error"><p>';
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_e('Composer autoloader is missing. Please run "composer install" to install the required dependencies.', 'duck-behavior-journal');
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echo '</p></div>';
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} elseif (!is_tcpdf_available()) {
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echo '<div class="notice notice-error"><p>';
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_e('TCPDF library is missing. Please install it via Composer to enable the PDF download feature.', 'duck-behavior-journal');
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echo '</p></div>';
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}
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}
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add_action('admin_notices', 'tcpdf_missing_notice');
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// Add custom endpoint for PDF download
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function add_pdf_download_endpoint()
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{
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add_rewrite_rule('^download-pdf/([0-9]+)/?', 'index.php?download_pdf=$matches[1]', 'top');
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}
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add_action('init', 'add_pdf_download_endpoint');
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// Add query vars for PDF download
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function add_pdf_query_vars($vars)
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{
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$vars[] = 'download_pdf';
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return $vars;
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}
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add_filter('query_vars', 'add_pdf_query_vars');
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// Handle PDF download
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function handle_pdf_download()
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{
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if (is_autoloader_available()) {
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require_once get_template_directory() . '/vendor/autoload.php';
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}
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if (is_tcpdf_available()) {
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$post_id = get_query_var('download_pdf');
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if ($post_id && is_numeric($post_id)) {
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$post = get_post($post_id);
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if ($post && $post->post_type == 'article') {
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// Create new PDF document
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$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
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// Set document information
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$pdf->SetCreator(PDF_CREATOR);
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$pdf->SetAuthor(get_bloginfo('name'));
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$pdf->SetTitle($post->post_title);
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$pdf->SetSubject('Scientific Paper');
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// Add a page
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$pdf->AddPage();
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// Set title
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$pdf->SetFont('helvetica', 'B', 20);
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$pdf->Cell(0, 10, $post->post_title, 0, 1, 'C');
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// Set authors
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$pdf->SetFont('helvetica', '', 12);
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$authors = get_post_meta($post_id, 'article_authors', true);
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if (!empty($authors)) {
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$pdf->Cell(0, 10, implode(', ', array_map('esc_html', $authors)), 0, 1, 'C');
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}
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// Set abstract
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$pdf->Ln(10);
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$pdf->SetFont('helvetica', 'B', 16);
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$pdf->Cell(0, 10, 'Abstract', 0, 1);
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$pdf->SetFont('helvetica', '', 12);
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$pdf->MultiCell(0, 10, $post->post_excerpt);
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// Set content
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$pdf->Ln(10);
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$pdf->SetFont('helvetica', 'B', 16);
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$pdf->Cell(0, 10, 'Content', 0, 1);
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$pdf->SetFont('helvetica', '', 12);
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$pdf->writeHTML($post->post_content);
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// Output PDF document
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$pdf->Output(sanitize_title($post->post_title) . '.pdf', 'D');
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exit;
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}
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}
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}
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}
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add_action('template_redirect', 'handle_pdf_download');
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@ -24,15 +24,15 @@
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</p>
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<p class="text-muted">
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<strong>Status:</strong> <?php
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$terms = get_the_terms(get_the_ID(), 'publication_status');
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if (!empty($terms) && !is_wp_error($terms)) {
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$term_list = array();
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foreach ($terms as $term) {
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$term_list[] = $term->name;
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}
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echo implode(', ', $term_list);
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}
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?>
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$terms = get_the_terms(get_the_ID(), 'publication_status');
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if (!empty($terms) && !is_wp_error($terms)) {
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$term_list = array();
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foreach ($terms as $term) {
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$term_list[] = $term->name;
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}
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echo implode(', ', $term_list);
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}
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?>
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</p>
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<?php if (has_excerpt()) : ?>
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<p class="text-muted"><strong>Abstract:</strong> <?php echo get_the_excerpt(); ?></p>
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<p class="text-muted"><strong>Note:</strong> <?php _e('The full paper is available for download for subscribers only.', 'duck-behavior-journal'); ?></p>
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<?php endif;
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endif; ?>
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<?php if (is_tcpdf_available()) : ?>
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<p><a href="<?php echo esc_url(home_url('/download-pdf/' . get_the_ID())); ?>" class="btn btn-primary"><?php _e('Download PDF', 'duck-behavior-journal'); ?></a></p>
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<?php endif; ?>
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<hr>
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<?php the_content(); ?>
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<?php endwhile;
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