476 lines
17 KiB
PHP
476 lines
17 KiB
PHP
<?php
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// This file is part of the Studyplan plugin for Moodle
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <https://www.gnu.org/licenses/>.
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/**
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* Determine premium status
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* @package local_treestudyplan
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* @copyright 2023 P.M. Kuipers
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* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace local_treestudyplan;
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->libdir.'/externallib.php');
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/**
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* Handle badge information in the same style as the other classes
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*/
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class premium extends \external_api {
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/**
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* Toggle the variable below to enable support for premium stuff.
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* If set to false, all premium features will be enabled and no premium settings panel will be visible.
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* @var bool
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*/
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private static $premiumsupported = false;
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/**
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* Certficate code
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* @var string
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*/
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private static $premiumcrt = "-----BEGIN CERTIFICATE-----
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MIIDSzCCAjMCFFlyhmKf1fN7U5lQL/dtlsyP24AQMA0GCSqGSIb3DQEBCwUAMGEx
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CzAJBgNVBAYTAk5MMRYwFAYDVQQIDA1Ob29yZC1Ib2xsYW5kMRowGAYDVQQKDBFN
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aXFyYSBFbmdpbmVlcmluZzEeMBwGA1UEAwwVVHJlZVN0dWR5cGxhbiBQcmVtaXVt
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MCAXDTI0MDIxMDE2MDQwM1oYDzIxMjQwMTE3MTYwNDAzWjBhMQswCQYDVQQGEwJO
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TDEWMBQGA1UECAwNTm9vcmQtSG9sbGFuZDEaMBgGA1UECgwRTWlxcmEgRW5naW5l
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ZXJpbmcxHjAcBgNVBAMMFVRyZWVTdHVkeXBsYW4gUHJlbWl1bTCCASIwDQYJKoZI
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hvcNAQEBBQADggEPADCCAQoCggEBAOD7+Nf5UBYGmIadI+kRM7vSPGA12F6cyZuZ
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O/JsdCWzZx3cCgVYt29DxHRvFVGrhGGLsoaMY9iXc9LdeO02jKqL3RoPo2kc5moT
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SNarsKZcGZXgqo5NATmdMLqQpKAy41H0ybgXZDLq5XKs9YIRlkwSpzQTNeP49mOl
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48giVX3icbpMw1TdQotalKXAtcs62o+guQJNANpjBRxPXssrmDoNXrJcAtUjNOjx
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8M+8tCmwkKwBoK8F3wWxIo04kZ9KILtybMmn4VJJ6SwLEf4StphTIoru8zS7XUt8
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3HbV3PsiyYErPlwIcobfcjwZJpub23bzetvxRvhpeIpLhrTGrPMCAwEAATANBgkq
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hkiG9w0BAQsFAAOCAQEAQwkbP6m3sdQgXEK3mYYZvvs6R/FI9QPu/9ICA+dgfj4y
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7wvL0toYYR5oXdhO9At3MYmS+0bFUmqoTS+cxsC4COpEKFbRBWwbJ3NXAw14Hx2U
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ELLqMZGJNOwNV+3ZdhADrwA++AjUqu144ObrcNUqo4+A4h9R8qj+o0J50Gvwja9R
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Uh67LsF4Ls8fUtqzpqct94bUl6MPMHlH4qpZlgndmQdgOwLWeQEmM8X3WtSJH90S
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n8FqBInMBhGu1uz0Qeo09ke0RHRnghP9EXfig/veMegASZeEhFqmS2Bdiy6gqeZ5
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Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
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-----END CERTIFICATE-----";
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/**
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* Cached status
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* @var object
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*/
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private static $cachedpremiumstatus = null;
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/**
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* Check if premium is supported
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* @return bool
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*/
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public static function supported() {
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return self::$premiumsupported;
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}
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/**
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* Decrypt encrypted data
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* @param string $encrypted Encrypted data
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*/
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private static function decrypt($encrypted) {
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// Get the public key.
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$key = \openssl_get_publickey(self::$premiumcrt);
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if ($key === false) {
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throw new \ParseError("Error parsing public key data)");
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}
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// Determine the key size.
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$keysize = \openssl_pkey_get_details($key)["bits"];
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$blocksize = ($keysize / 8); // Bits / 8. Whether padded or not.
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// Decode data in.
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$b64 = \base64_decode($encrypted);
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if ($b64 === false) {
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throw new \ParseError("Error in base64 decoding");
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}
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$data = \str_split($b64, $blocksize);
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$decrypted = "";
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$i = 0;
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foreach ($data as $chunk) {
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if (\openssl_public_decrypt($chunk, $dchunk, $key, \OPENSSL_PKCS1_PADDING)) {
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$decrypted .= $dchunk;
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} else {
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throw new \ParseError("Error decrypting chunk $i ({$blocksize} bytes)");
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}
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$i++;
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}
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// Deprecated in PHP 8.0 and up, but included to be compatible with 7.4.
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if (\PHP_MAJOR_VERSION < 8) {
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\openssl_pkey_free($key);
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}
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return $decrypted;
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}
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/**
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* Trim headers from key data
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* @param string $data the key dat with headers
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* @return string Key without headers
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*/
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private static function trim_headers($data) {
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// Headers are repeated in this function for easier testing and copy-pasting into other projects.
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$startheader = "----- BEGIN ACTIVATION KEY -----";
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$endheader = "----- END ACTIVATION KEY -----";
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$parts = preg_split("/\r?\n/", \trim($data));
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if (count($parts) > 2) {
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$start = -1;
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$end = -1;
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for ($i = 0; $i < count($parts); $i++) {
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// Make sure all unicode spaces are converted to normal spaces before comparing.
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$p = trim(preg_replace('/\s+/u', ' ', $parts[$i]));
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if ($p == $startheader) {
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$start = $i + 1;
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}
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if ($start > 0 && $p == $endheader) {
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$end = $i;
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}
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}
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if ($start < 0 || $end < 0 || $end - $start <= 0) {
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throw new \ParseError("Invalid activation key wrappers");
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} else {
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$keyslice = array_slice($parts, $start, $end - $start);
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return implode("\n", $keyslice);
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}
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} else {
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throw new \ParseError("Invalid activation key");
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}
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}
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/**
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* Check if premium status is enabled
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* @return bool
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*/
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public static function enabled() {
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if (self::$premiumsupported) {
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$status = self::premiumstatus();
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return $status->enabled;
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} else {
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return true;
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}
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}
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/**
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* Check if the premium key includes a specific intent in addition to the treestudyplan.
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* @param string $intent The intent to search for
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* @return bool
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*/
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public static function has_intent($intent) {
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$status = self::premiumstatus();
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if ($status->enabled) {
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return \in_array(\strtolower($intent), $status->intents);
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} else {
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return false;
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}
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}
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/**
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* Generate debug info.
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*/
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public static function debuginfo() {
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$s = "<pre>";
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try {
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$activationkey = \get_config("local_treestudyplan", "premium_key");
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if (strlen($activationkey) > 0) {
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$keydata = self::trim_headers($activationkey);
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$json = self::decrypt($keydata);
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$s .= "Decoded key data:\n----\n";
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$s .= $json . "\n----\n";
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$decoded = \json_decode($json, false);
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$s .= "Read as object:\n----\n";
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$s .= \json_encode($decoded, \JSON_PRETTY_PRINT) ."\n----\n";
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$status = self::premiumstatus();
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$s .= "Parsed premium status block:\n----\n";
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$s .= \json_encode($status, \JSON_PRETTY_PRINT) ."\n----\n";
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$s .= "Message: " . self::statusdescription() . "\n";
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} else {
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$s .= "Premium key empty";
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}
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} catch (\Throwable $x) {
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$s .= "!!! " . get_class($x) . ": " . $x->getCode() . " | " . $x->getMessage(). "\n";
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$stack = explode("\n", $x->getTraceAsString());
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foreach ($stack as $l) {
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$s .= " " . trim($l) ."\n";
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}
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}
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$s .= "</pre>";
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return $s;
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}
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/**
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* Determine, cache and retrieve premium status
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* @return object
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*/
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protected static function premiumstatus() {
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if (!isset(self::$cachedpremiumstatus)) {
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// Initialize default object.
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$o = new \stdClass;
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$o->enabled = false;
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$o->intents = [];
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$o->name = "";
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$o->website = "";
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$o->expires = "";
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$o->expired = false;
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$o->issued = "";
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try {
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$activationkey = \get_config("local_treestudyplan", "premium_key");
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if (strlen($activationkey) > 0) {
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$keydata = self::trim_headers($activationkey);
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$json = self::decrypt($keydata);
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$decoded = \json_decode($json, false);
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if (is_object($decoded)) {
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// Copy basic data/.
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$keys = ["name", "website", "expires", "issued"];
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foreach ($keys as $k) {
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if (isset($decoded->$k)) {
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$o->$k = $decoded->$k;
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}
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}
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if (!empty($decoded->intent)) {
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$o->intents = explode(",", $decoded->intent);
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}
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// Convert dates to DateTime for.
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$now = new \DateTime();
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$issuedate = new \DateTime($o->issued);
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if ($o->expires == 'never') {
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// If expiry date == never.
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$expirydate = new \DateTime(); // Default to now and add a year.
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$expirydate->add(new \DateInterval("P1Y"));
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} else {
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try {
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$expirydate = new \DateTime($o->expires);
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} catch (\Exception $x) {
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$expirydate = new \DateTime(); // Default to now.
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}
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}
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if (\in_array('treestudyplan', $o->intents)
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&& !empty($o->issued)
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&& self::website_match($o->website)
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) {
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if ($expirydate > $now) {
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$o->enabled = true;
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$o->expired = false;
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} else {
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$o->expired = true;
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$o->enabled = false;
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}
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// Format dates localized.
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$o->issued = \userdate($issuedate->getTimestamp(), \get_string('strftimedate', 'langconfig'));
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if ($o->expires == "never") {
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$o->expires = \get_string("premium:never", 'local_treestudyplan');
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} else {
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$o->expires = \userdate($expirydate->getTimestamp(), \get_string('strftimedate', 'langconfig'));
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}
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}
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}
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}
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} catch (\ParseError $x) {
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$o->status = \get_string("premium:invalidactivationcontent", "local_treestudyplan");
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}
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self::$cachedpremiumstatus = $o;
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}
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return self::$cachedpremiumstatus;
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}
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/**
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* Check if the current site matches the provided key
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* @param string $key Website pattern to match against
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*/
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private static function website_match($key) {
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global $CFG;
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$site = $CFG->wwwroot;
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// Add double slashes to key and site if no scheme is set.
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// Basically: if no double slashes present before any dots, slashes or @s.
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if (!\preg_match_all('#^[^./@]*?//#', $key)) {
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$key = "//".$key;
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}
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if (!\preg_match_all('#^[^./@]*?//#', $site)) {
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$site = "//".$site;
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}
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// Use parse_url() to split path and host.
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$keyurl = (object)\parse_url($key);
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$siteurl = (object)\parse_url($site);
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// No match if host is empty on key or site.
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if (empty($keyurl->host) || empty($siteurl->host)) {
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return false;
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}
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if ($keyurl->host == "*") {
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// Value * matches all.
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return true;
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}
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// First match the host part.
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$keyparts = \array_reverse(\explode(".", $keyurl->host));
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$siteparts = \array_reverse(\explode(".", $siteurl->host));
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// Trim starting www from both parts, since site.domain and www.site.domain should be treated as the same.
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if (($x = \array_pop($keyparts)) != "www") {
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\array_push($keyparts, $x);
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}
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if (($x = \array_pop($siteparts)) != "www") {
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\array_push($siteparts, $x);
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}
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for ($i = 0; $i < count($keyparts); $i++) {
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// No match if the site does not have a part, but the key does. Unless the key part is .
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if (!isset($siteparts[$i])) {
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if ($keyparts[$i] != "*") {
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return false;
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} else {
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$i++; // Increment $i by one before break, to make sure the comparison following this loop holds.
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break; // Stop comparison. Host part matches.
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}
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}
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// Now do a proper case insensitive check for matching.
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// Uses fnmatch to easily handle shell type wildcards.
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if (! \fnmatch($keyparts[$i], $siteparts[$i], \FNM_CASEFOLD)) {
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return false;
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}
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}
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// Fail if the site has a deeper subdomain than the key, unless the deepest key subdomain is .
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if ($keyparts[$i - 1] != '*' && count($siteparts) > ($i)) {
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return false;
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}
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// If we made it here then the host part matches. Now check the path.
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// If path is /*, matches all subpaths including /.
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$keypath = empty($keyurl->path) ? "/" : $keyurl->path;
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$sitepath = empty($siteurl->path) ? "/" : $siteurl->path;
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// Trim trailing / from both paths before comparison.
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if (\strlen($sitepath) > 1) {
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$sitepath = \rtrim($sitepath, "/");
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}
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if (\strlen($keypath) > 1) {
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$keypath = \rtrim($keypath, "/");
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}
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// Do a case insensitive fnmatch on the site so wildcards are matched too.
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return \fnmatch($keypath, $sitepath, \FNM_CASEFOLD);
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}
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/**
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* Parameter description for webservice function get_premiumstatus
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*/
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public static function get_premiumstatus_parameters(): \external_function_parameters {
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return new \external_function_parameters([]);
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}
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/**
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* Return value description for webservice function get_premiumstatus
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*/
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public static function get_premiumstatus_returns(): \external_description {
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return new \external_single_structure([
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"enabled" => new \external_value(PARAM_BOOL, 'premium status enabled'),
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"website" => new \external_value(PARAM_TEXT, 'premium registration website'),
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"name" => new \external_value(PARAM_TEXT, 'premium registration name'),
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"expires" => new \external_value(PARAM_TEXT, 'premium registration expiry date'),
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"expired" => new \external_value(PARAM_BOOL, 'premium status expired'),
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"intents" => new \external_multiple_structure(
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new \external_value(PARAM_TEXT), 'additional intents included in the license'
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),
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]);
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}
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/**
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* Get premium status information for webservice
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* @return object
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*/
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public static function get_premiumstatus() {
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if (self::$premiumsupported) {
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$status = self::premiumstatus();
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$keys = [
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"enabled",
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"website",
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"name",
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"expires",
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"expired",
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"intents",
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];
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$result = [];
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foreach ($keys as $param) {
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$result[$param] = $status->$param;
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}
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return $result;
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} else {
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return [
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"enabled" => true,
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"website" => '*',
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"name" => '*',
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"expires" => '',
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"expired" => false,
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"intents" => [],
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];
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}
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}
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/**
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* Get a descriptive text of the current premium status
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* @return string HTML description of premium status.
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*/
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public static function statusdescription() {
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$status = self::premiumstatus();
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$msg = new \stdClass;
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$msg->name = $status->name;
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$msg->issued = $status->issued;
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$msg->expires = $status->expires;
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if ($status->website != "*") {
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$msg->sitestatus = \get_string("premium:onsite", 'local_treestudyplan', $status);
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} else {
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$msg->sitestatus = \get_string("premium:anywhere", 'local_treestudyplan');
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}
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if ($status->enabled) {
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return \get_string("premium:active", 'local_treestudyplan', $msg);
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} else if ($status->expired) {
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return \get_string("premium:expired", 'local_treestudyplan', $msg);
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} else if (!self::website_match($status->website)) {
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return \get_string("premium:siteinvalid", 'local_treestudyplan', $status->website);
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} else {
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return \get_string("premium:notregistered", 'local_treestudyplan', $msg);
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}
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}
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/**
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* Throw an error if premium status is not enabled
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* @param string $message Message translation key to use in exception
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*/
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public static function require_premium($message="premiumfeature:warning") {
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if (! self::enabled()) {
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throw new \moodle_exception($message, "local_treestudyplan");
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}
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}
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}
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