Init

README.md

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+A simple script that accepts a PDF file over HTTP and prints it.
+
+Usage:
+
+* `print.php?action=list`: Returns a JSON list of available printers.
+  * Example response: `{"printers": ["canon-123", "brother-etc"]}`
+* `print.php?action=print&printer=[printername]`: Print a PDF to the specified printer. The request body shall contain the PDF document.
+  * Example curl command: `curl --data-binary "@/home/user/test.pdf" "http://localhost/print.php?action=print&printer=brother-etc"`
+
+Requires `lp`, `lpstat`, and `pdfinfo` commands to be available.

nbproject/project.properties

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+include.path=${php.global.include.path}
+php.version=PHP_74
+source.encoding=UTF-8
+src.dir=.
+tags.asp=false
+tags.short=false
+web.root=.

nbproject/project.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://www.netbeans.org/ns/project/1">
+    <type>org.netbeans.modules.php.project</type>
+    <configuration>
+        <data xmlns="http://www.netbeans.org/ns/php-project/1">
+            <name>PDF-Web-Print-CUPS-Proxy</name>
+        </data>
+    </configuration>
+</project>

print.php

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+<?php
+
+/*
+ * Copyright 2020 Netsyms Technologies.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// Change these values if commands aren't on $PATH
+$CMDS = [
+    "lp" => "lp",
+    "lpstat" => "lpstat",
+    "pdfinfo" => "pdfinfo"
+];
+
+header("Content-Type: application/json");
+
+function getPrinters(): array {
+    global $CMDS;
+    $printerlist = `$CMDS[lpstat] -a`;
+    $lines = explode("\n", $printerlist);
+
+    $printers = [];
+    foreach ($lines as $line) {
+        $printer = explode(" ", $line, 2)[0];
+        if (empty($printer)) {
+            continue;
+        }
+        $printers[] = $printer;
+    }
+    return $printers;
+}
+
+if ($_GET["action"] == "list") {
+    exit(json_encode([
+        "printers" => getPrinters()
+    ]));
+} else if ($_GET["action"] == "print") {
+
+    if (empty($_GET["printer"]) || !in_array($_GET["printer"], getPrinters())) {
+        http_response_code(400);
+        exit(json_encode([
+            "error" => "No printer specified or printer does not exist."
+        ]));
+    }
+    $printer = $_GET["printer"];
+
+    $content = file_get_contents("php://input");
+
+    $pdffile = tempnam(sys_get_temp_dir(), "WEB_PDF_PRINT");
+
+    file_put_contents($pdffile, $content);
+
+    $pdfinfo = `$CMDS[pdfinfo] $pdffile`;
+    preg_match('/Page size: *([0-9]*\.?[0-9]?) x ([0-9]*\.?[0-9]?)/', $pdfinfo, $matches);
+    $width = $matches[1];
+    $height = $matches[2];
+    $media = "Custom.$width" . "x$height";
+
+    `$CMDS[lp] -o media=$media -d $printer $pdffile`;
+
+    unlink($pdffile);
+
+    exit(json_encode([
+        "printed" => true
+    ]));
+} else {
+    http_response_code(404);
+    exit(json_encode([
+        "error" => "No action or invalid action specified."
+    ]));
+}