easy-invoice / includes / Controllers / StatementController.php

StatementController.php in Easy Invoice – Invoice Generator, PDF Quotes & Payments 2.4.0, at includes/Controllers/StatementController.php

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1	<?php
2	/**
3	* Statement of account for a client.
4	*
5	* @package Easy_Invoice
6	* @subpackage Controllers
7	*/
8
9	namespace EasyInvoice\Controllers;
10
11	use EasyInvoice\Services\ClientLedger;
12	use EasyInvoice\Services\PdfRenderer;
13
14	if ( ! defined( 'ABSPATH' ) ) {
15	exit;
16	}
17
18	/**
19	* Shows and prints what a client owes across every document.
20	*
21	* Why this is not just an invoice list
22	* ------------------------------------
23	* "What do I owe you?" is the most common question a client asks, and an
24	* invoice list cannot answer it: the answer depends on invoices, payments and
25	* credit notes together, in date order, with a running balance. Every
26	* accounting package has this, and it is the thing a bookkeeper reconciles
27	* against at the end of a quarter.
28	*
29	* It is also the cheapest way to get paid. Sending a client one page that shows
30	* three unpaid invoices is more effective than sending three reminders.
31	*/
32	class StatementController {
33
34	/** Admin page slug. */
35	const PAGE_SLUG = 'easy-invoice-statement';
36
37	/** admin-post action that serves the PDF. */
38	const ACTION_PDF = 'easy_invoice_statement_pdf';
39
40	/**
41	* Wire it up.
42	*
43	* @return void
44	*/
45	public static function init(): void {
46	add_action( 'admin_menu', [ __CLASS__, 'registerPage' ], 99 );
47	add_action( 'easy_invoice_admin_main_content', [ __CLASS__, 'maybeRenderPage' ], 11 );
48	add_action( 'admin_post_' . self::ACTION_PDF, [ __CLASS__, 'handlePdf' ] );
49
50	add_filter( 'easy_invoice_self_rendering_pages', [ __CLASS__, 'claimPage' ] );
51	}
52
53	/**
54	* Tell the dispatcher this page draws itself.
55	*
56	* @param array $slugs Slugs that render themselves.
57	* @return array
58	*/
59	public static function claimPage( $slugs ): array {
60	$slugs = is_array( $slugs ) ? $slugs : [];
61	$slugs[] = self::PAGE_SLUG;
62
63	return $slugs;
64	}
65
66	/**
67	* Register the hidden page.
68	*
69	* @return void
70	*/
71	public static function registerPage(): void {
72	add_submenu_page(
73	'easy-invoice-hidden',
74	__( 'Statement of Account', 'easy-invoice' ),
75	__( 'Statement', 'easy-invoice' ),
76	(string) apply_filters( 'easy_invoice_menu_capability', 'manage_options', self::PAGE_SLUG ),
77	self::PAGE_SLUG,
78	[ __CLASS__, 'renderShell' ]
79	);
80	}
81
82	/**
83	* Render the admin chrome.
84	*
85	* @return void
86	*/
87	public static function renderShell(): void {
88	include EASY_INVOICE_PLUGIN_DIR . 'templates/main-template.php';
89	}
90
91	/**
92	* Render the statement when the shell asks for it.
93	*
94	* @param string $page Page slug.
95	* @return void
96	*/
97	public static function maybeRenderPage( $page ): void {
98	// A statement is a read-only view of documents the reader may already
99	// see. Gating it on client management locked out the Accountant role,
100	// which is exactly who reconciles against one.
101	if ( self::PAGE_SLUG !== $page \|\| ! easy_invoice_user_can( 'ei_view_invoices' ) ) {
102	return;
103	}
104
105	// phpcs:disable WordPress.Security.NonceVerification.Recommended -- read-only view.
106	$client_id = isset( $_GET['client_id'] ) ? absint( $_GET['client_id'] ) : 0;
107	$from = isset( $_GET['from'] ) ? sanitize_text_field( wp_unslash( $_GET['from'] ) ) : '';
108	$to = isset( $_GET['to'] ) ? sanitize_text_field( wp_unslash( $_GET['to'] ) ) : '';
109	// phpcs:enable
110
111	$client = $client_id > 0 ? get_userdata( $client_id ) : false;
112
113	if ( ! $client ) {
114	echo '<div class="p-8"><p>' . esc_html__( 'That client does not exist.', 'easy-invoice' ) . '</p></div>';
115	return;
116	}
117
118	$statement = ClientLedger::statement( $client_id, $from, $to );
119
120	include EASY_INVOICE_PLUGIN_DIR . 'templates/admin/statement-page.php';
121	}
122
123	/**
124	* Serve the statement as a PDF.
125	*
126	* @return void
127	*/
128	public static function handlePdf(): void {
129	$client_id = isset( $_GET['client_id'] ) ? absint( $_GET['client_id'] ) : 0;
130	$nonce = isset( $_GET['_wpnonce'] ) ? sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ) ) : '';
131
132	if ( ! wp_verify_nonce( $nonce, self::ACTION_PDF . '_' . $client_id ) ) {
133	wp_die( esc_html__( 'Security check failed.', 'easy-invoice' ), '', [ 'response' => 403 ] );
134	}
135
136	if ( ! easy_invoice_user_can( 'ei_view_invoices' ) ) {
137	wp_die( esc_html__( 'You do not have permission to do that.', 'easy-invoice' ), '', [ 'response' => 403 ] );
138	}
139
140	$client = $client_id > 0 ? get_userdata( $client_id ) : false;
141	if ( ! $client ) {
142	wp_die( esc_html__( 'That client does not exist.', 'easy-invoice' ), '', [ 'response' => 404 ] );
143	}
144
145	if ( ! PdfRenderer::isAvailable() ) {
146	wp_die(
147	esc_html__( 'Server-side PDF rendering is unavailable because the PDF library is missing.', 'easy-invoice' ),
148	'',
149	[ 'response' => 501, 'back_link' => true ]
150	);
151	}
152
153	// phpcs:disable WordPress.Security.NonceVerification.Recommended -- covered by the nonce above.
154	$from = isset( $_GET['from'] ) ? sanitize_text_field( wp_unslash( $_GET['from'] ) ) : '';
155	$to = isset( $_GET['to'] ) ? sanitize_text_field( wp_unslash( $_GET['to'] ) ) : '';
156	// phpcs:enable
157
158	$statement = ClientLedger::statement( $client_id, $from, $to );
159
160	ob_start();
161	include EASY_INVOICE_PLUGIN_DIR . 'templates/pdf/statement.php';
162	$html = (string) ob_get_clean();
163
164	$pdf = PdfRenderer::fromHtml( $html );
165
166	if ( is_wp_error( $pdf ) ) {
167	wp_die( esc_html( $pdf->get_error_message() ), '', [ 'response' => 500, 'back_link' => true ] );
168	}
169
170	$name = sanitize_file_name( 'statement-' . ( $client->display_name ?: $client->user_login ) . '.pdf' );
171
172	if ( ob_get_length() ) {
173	@ob_end_clean(); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
174	}
175
176	nocache_headers();
177	header( 'Content-Type: application/pdf' );
178	header( 'Content-Disposition: attachment; filename="' . $name . '"' );
179	header( 'Content-Length: ' . strlen( $pdf ) );
180	header( 'X-Content-Type-Options: nosniff' );
181
182	echo $pdf; // phpcs:ignore WordPress.Security.EscapeOutput -- binary document.
183	exit;
184	}
185
186	/**
187	* URL of the statement screen for a client.
188	*
189	* @param int $client_id Client ID.
190	* @return string
191	*/
192	public static function pageUrl( int $client_id ): string {
193	return add_query_arg(
194	[
195	'page' => self::PAGE_SLUG,
196	'client_id' => $client_id,
197	],
198	admin_url( 'admin.php' )
199	);
200	}
201
202	/**
203	* URL that downloads the statement PDF.
204	*
205	* @param int $client_id Client ID.
206	* @param string $from Start date.
207	* @param string $to End date.
208	* @return string
209	*/
210	public static function pdfUrl( int $client_id, string $from = '', string $to = '' ): string {
211	return wp_nonce_url(
212	add_query_arg(
213	array_filter(
214	[
215	'action' => self::ACTION_PDF,
216	'client_id' => $client_id,
217	'from' => $from,
218	'to' => $to,
219	]
220	),
221	admin_url( 'admin-post.php' )
222	),
223	self::ACTION_PDF . '_' . $client_id
224	);
225	}
226	}
227