From fbe34189f645fac316dad04479d404497f1e9468 Mon Sep 17 00:00:00 2001
From: PMKuipers <pm@miqra.nl>
Date: Fri, 19 Jul 2024 17:41:49 +0200
Subject: [PATCH] Removed non-functional premium handling code. All features
 now normally available.

---
 amd/src/page-edit-plan.js              |   2 -
 amd/src/report-viewer-components.js    |   4 +-
 amd/src/studyplan-editor-components.js | 129 +++----
 amd/src/util/premium.js                |  42 ---
 amd/src/util/settings.js               |   4 +-
 classes/form/studyplan_editform.php    |  15 +-
 classes/premium.php                    | 476 -------------------------
 classes/studentstudyplanservice.php    |   2 +-
 classes/studyplan.php                  |   2 +-
 coach.php                              |   2 -
 db/services.php                        |  12 -
 doc/advanced.htm                       |   4 +-
 edit-plan.php                          |   2 +-
 lang/en/local_treestudyplan.php        |  25 --
 lang/nl/local_treestudyplan.php        |  25 --
 lib.php                                |   5 +-
 result-overview.php                    |   5 -
 settings.php                           |  53 +--
 18 files changed, 78 insertions(+), 731 deletions(-)
 delete mode 100644 amd/src/util/premium.js
 delete mode 100644 classes/premium.php

diff --git a/amd/src/page-edit-plan.js b/amd/src/page-edit-plan.js
index f20ac79..dc59099 100644
--- a/amd/src/page-edit-plan.js
+++ b/amd/src/page-edit-plan.js
@@ -29,7 +29,6 @@ import {loadStrings} from './util/string-helper';
 import {processStudyplan} from './studyplan-processor';
 import {download, upload} from './downloader';
 import {studyplanTiming} from './util/date-helper';
-import {premiumenabled, premiumstatus} from "./util/premium";
 import mFormComponents from "./util/mform-helper";
 Vue.use(mFormComponents);
 
@@ -145,7 +144,6 @@ export function init(contextid, categoryid, options) {
 
         },
         computed: {
-            premiumenabled,
             dropdownTitle() {
                 if (this.activestudyplan && this.activestudyplan.name) {
                     return this.activestudyplan.name;
diff --git a/amd/src/report-viewer-components.js b/amd/src/report-viewer-components.js
index f9efcb7..97eaf9f 100644
--- a/amd/src/report-viewer-components.js
+++ b/amd/src/report-viewer-components.js
@@ -17,7 +17,6 @@ import Debugger from './util/debugger';
 import Config from 'core/config';
 import {processStudyplan, objCopy} from './studyplan-processor';
 import TSComponents from './treestudyplan-components';
-import {premiumenabled} from "./util/premium";
 import FitTextVue from './util/fittext-vue';
 
 
@@ -926,7 +925,6 @@ export default {
                 }
             },
             methods: {
-                premiumenabled,
                 formatDatetime,
                 onLineHeightChange(lineid) {
                     // All layers for this line have the first slot send an update message on layer height change.
@@ -1044,7 +1042,7 @@ export default {
                 ><div class="r-studyline-handle" :style="'background-color: ' + value.color"></div>
                 <div class="r-studyline-title"><div>
                     <abbr v-b-tooltip.hover :title="value.name">{{ value.shortname }}</abbr>
-                    <template v-if="premiumenabled() && enrollable">
+                    <template v-if="enrollable">
                         <template v-if="teachermode">
                             <br>
                             <a  v-if="!canEnrol"
diff --git a/amd/src/studyplan-editor-components.js b/amd/src/studyplan-editor-components.js
index a624590..a089932 100644
--- a/amd/src/studyplan-editor-components.js
+++ b/amd/src/studyplan-editor-components.js
@@ -16,7 +16,6 @@ import Debugger from './util/debugger';
 import Config from 'core/config';
 import {download, upload} from './downloader';
 import {processStudyplan, processStudyplanPage} from './studyplan-processor';
-import {premiumenabled} from "./util/premium";
 import FitTextVue from './util/fittext-vue';
 import {settings} from "./util/settings";
 import TSComponents from './treestudyplan-components';
@@ -820,7 +819,6 @@ export default {
                 };
             },
             methods: {
-                premiumenabled,
                 showModal() {
                     this.show = true;
                     this.loadAssociations();
@@ -863,19 +861,17 @@ export default {
                         return;
                     }).catch(notification.exception);
 
-                    if (premiumenabled()) {
-                        self.loading.coaches = true;
-                        call([{
-                            methodname: 'local_treestudyplan_associated_coaches',
-                            args: {
-                                'studyplan_id': self.value.id,
-                            }
-                        }])[0].then((response) => {
-                            self.association.coaches = response.map(self.userOptionModel);
-                            self.loading.coaches = false;
-                            return;
-                        }).catch(notification.exception);
-                    }
+                    self.loading.coaches = true;
+                    call([{
+                        methodname: 'local_treestudyplan_associated_coaches',
+                        args: {
+                            'studyplan_id': self.value.id,
+                        }
+                    }])[0].then((response) => {
+                        self.association.coaches = response.map(self.userOptionModel);
+                        self.loading.coaches = false;
+                        return;
+                    }).catch(notification.exception);
                 },
                 searchCohorts(searchtext) {
                     const self = this;
@@ -999,65 +995,59 @@ export default {
                     }
                 },
                 searchCoaches(searchtext) {
-                    if (premiumenabled()) {
-                        const self = this;
-                        if (searchtext.length > 0) {
-                            call([{
-                                methodname: 'local_treestudyplan_find_coach',
-                                args: {
-                                    like: searchtext,
-                                    'studyplan_id': self.value.id,
-                                }
-                            }])[0].then((response) => {
-                                self.search.coaches = response.map(self.userOptionModel);
-                                return;
-                            }).catch(notification.exception);
-                        } else {
-                            self.search.coaches = [];
-                        }
+                    const self = this;
+                    if (searchtext.length > 0) {
+                        call([{
+                            methodname: 'local_treestudyplan_find_coach',
+                            args: {
+                                like: searchtext,
+                                'studyplan_id': self.value.id,
+                            }
+                        }])[0].then((response) => {
+                            self.search.coaches = response.map(self.userOptionModel);
+                            return;
+                        }).catch(notification.exception);
+                    } else {
+                        self.search.coaches = [];
                     }
                 },
                 coachAssociate() {
-                    if (premiumenabled()) {
-                        const self = this;
-                        const associated = self.association.coaches;
-                        const search = self.search.coaches;
-                        const searchselected = self.selected.search.coaches;
-                        for (const i in searchselected) {
-                            const r = searchselected[i];
+                    const self = this;
+                    const associated = self.association.coaches;
+                    const search = self.search.coaches;
+                    const searchselected = self.selected.search.coaches;
+                    for (const i in searchselected) {
+                        const r = searchselected[i];
 
-                            call([{
-                                methodname: 'local_treestudyplan_connect_coach',
-                                args: {
-                                    'studyplan_id': self.value.id,
-                                    'user_id': r,
-                                },
-                            }])[0].then((response) => {
-                                if (response.success) {
-                                    transportItem(associated, search, r);
-                                }
-                                return;
-                            }).catch(notification.exception);
-                        }
+                        call([{
+                            methodname: 'local_treestudyplan_connect_coach',
+                            args: {
+                                'studyplan_id': self.value.id,
+                                'user_id': r,
+                            },
+                        }])[0].then((response) => {
+                            if (response.success) {
+                                transportItem(associated, search, r);
+                            }
+                            return;
+                        }).catch(notification.exception);
                     }
                 },
                 coachDisassociate() {
-                    if (premiumenabled()) {
-                        const self = this;
-                        const associatedselected = self.selected.associated.coaches;
-                        for (const i in associatedselected) {
-                            const r = associatedselected[i];
+                    const self = this;
+                    const associatedselected = self.selected.associated.coaches;
+                    for (const i in associatedselected) {
+                        const r = associatedselected[i];
 
-                            call([{
-                                methodname: 'local_treestudyplan_disconnect_coach',
-                                args: {
-                                    'studyplan_id': self.value.id,
-                                    'user_id': r,
-                                }
-                            }])[0].then(() => {
-                                return;
-                            }).catch(notification.exception);
-                        }
+                        call([{
+                            methodname: 'local_treestudyplan_disconnect_coach',
+                            args: {
+                                'studyplan_id': self.value.id,
+                                'user_id': r,
+                            }
+                        }])[0].then(() => {
+                            return;
+                        }).catch(notification.exception);
                     }
                 },
             },
@@ -1163,7 +1153,7 @@ export default {
                     </b-row>
                 </b-container>
             </b-tab>
-            <b-tab :title="text.coaches" v-if="premiumenabled()">
+            <b-tab :title="text.coaches">
                 <b-container>
                     <b-row class='mb-2 mt-2'>
                         <b-col>{{text.associated_coaches}}</b-col>
@@ -1509,7 +1499,6 @@ export default {
                 },
             },
             methods: {
-                premiumenabled,
                 columns(page) {
                     return 1 + (page.periods * 2);
                 },
@@ -2144,7 +2133,6 @@ export default {
                                             <!-- hsluv-picker v-model="create.studyline.color" horizontal displaysize="175" ></hsluv-picker -->
                                         </b-col>
                                     </b-row>
-                                    <template v-if="premiumenabled()">
                                     <b-row>
                                     <b-col cols="3">{{ text.studyline_enrollable}}</b-col>
                                         <b-col>
@@ -2170,7 +2158,6 @@ export default {
                                             ></b-form-select>
                                         </b-col>
                                     </b-row>
-                                    </template>
                                 </b-container>
                             </b-modal>
                             <b-modal
@@ -2204,7 +2191,6 @@ export default {
                                             <input type="color" v-model="edit.studyline.data.color" />
                                         </b-col>
                                     </b-row>
-                                    <template v-if="premiumenabled()">
                                     <b-row>
                                     <b-col cols="3">{{ text.studyline_enrollable}}</b-col>
                                         <b-col>
@@ -2229,7 +2215,6 @@ export default {
                                             ></b-form-select>
                                         </b-col>
                                     </b-row>
-                                    </template>
                                 </b-container>
                             </b-modal>
                         </b-tab>
diff --git a/amd/src/util/premium.js b/amd/src/util/premium.js
deleted file mode 100644
index 0288799..0000000
--- a/amd/src/util/premium.js
+++ /dev/null
@@ -1,42 +0,0 @@
-/* eslint no-var: "error" */
-/* eslint-env es6*/
-
-import {call} from 'core/ajax';
-import notification from 'core/notification';
-
-// Prepare default value.
-let premiumstatusCache = null;
-
-/**
- * Check if premium status is enabled.
- * @returns {Bool} True/False
- */
-export function premiumenabled() {
-    const premium = premiumstatus();
-    if (premium) {
-        return (premium.enabled) ? true : false;
-    } else {
-        return true; // Temporarily return true, that is easier than going full async.
-    }
-}
-
-/**
- * Get premium status object
- * @returns {Object} The premium status object
- */
-function premiumstatus() {
-    if (!premiumstatusCache) {
-        // Retrieve premium status if needed.
-        call([{
-            methodname: 'local_treestudyplan_premiumstatus',
-            args: {}
-        }])[0].then((response) => {
-            premiumstatusCache = response;
-            return;
-        }).catch(notification.exception);
-    }
-    return premiumstatusCache;
-}
-
-// Preload premium status.
-premiumstatus();
\ No newline at end of file
diff --git a/amd/src/util/settings.js b/amd/src/util/settings.js
index ac6c1ea..b71e115 100644
--- a/amd/src/util/settings.js
+++ b/amd/src/util/settings.js
@@ -8,7 +8,7 @@ import notification from 'core/notification';
 let settingcache = null;
 
 /**
- * Check if premium status is enabled.
+ * Retrieve settings.
  * @param {String} key
  * @returns {*}
  */
@@ -39,5 +39,5 @@ function loadsettings() {
     return settingcache;
 }
 
-// Preload premium status.
+// Preload settings.
 loadsettings();
\ No newline at end of file
diff --git a/classes/form/studyplan_editform.php b/classes/form/studyplan_editform.php
index 88bab46..ca98337 100644
--- a/classes/form/studyplan_editform.php
+++ b/classes/form/studyplan_editform.php
@@ -27,7 +27,6 @@ defined('MOODLE_INTERNAL') || die();
 require_once($CFG->dirroot.'/repository/lib.php');
 use local_treestudyplan\aggregator;
 use local_treestudyplan\studyplan;
-use local_treestudyplan\premium;
 use local_treestudyplan\debug;
 use local_treestudyplan\studyplanservice;
 use local_treestudyplan\courseservice;
@@ -236,14 +235,12 @@ class studyplan_editform extends formbase {
                 [],
             );
 
-            if (premium::enabled()) {
-                $field = 'template';
-                $mform->addElement('advcheckbox', $field,
-                    get_string('studyplan_template', 'local_treestudyplan'),
-                    get_string('studyplan_template_details', 'local_treestudyplan'),
-                    [],
-                );
-            }
+            $field = 'template';
+            $mform->addElement('advcheckbox', $field,
+                get_string('studyplan_template', 'local_treestudyplan'),
+                get_string('studyplan_template_details', 'local_treestudyplan'),
+                [],
+            );
         }
 
         $aggregators = [];
diff --git a/classes/premium.php b/classes/premium.php
deleted file mode 100644
index b3e1708..0000000
--- a/classes/premium.php
+++ /dev/null
@@ -1,476 +0,0 @@
-<?php
-// This file is part of the Studyplan plugin for Moodle
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
-
-/**
- * Determine premium status
- * @package    local_treestudyplan
- * @copyright  2023 P.M. Kuipers
- * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-namespace local_treestudyplan;
-defined('MOODLE_INTERNAL') || die();
-
-require_once($CFG->libdir.'/externallib.php');
-
-/**
- * Handle badge information in the same style as the other classes
- */
-class premium extends \external_api {
-
-    /**
-     * Toggle the variable below to enable support for premium stuff.
-     * If set to false, all premium features will be enabled and no premium settings panel will be visible.
-     * @var bool
-     */
-    private static $premiumsupported = false;
-
-    /**
-     * Certficate code
-     * @var string
-     */
-    private static $premiumcrt = "-----BEGIN CERTIFICATE-----
-MIIDSzCCAjMCFFlyhmKf1fN7U5lQL/dtlsyP24AQMA0GCSqGSIb3DQEBCwUAMGEx
-CzAJBgNVBAYTAk5MMRYwFAYDVQQIDA1Ob29yZC1Ib2xsYW5kMRowGAYDVQQKDBFN
-aXFyYSBFbmdpbmVlcmluZzEeMBwGA1UEAwwVVHJlZVN0dWR5cGxhbiBQcmVtaXVt
-MCAXDTI0MDIxMDE2MDQwM1oYDzIxMjQwMTE3MTYwNDAzWjBhMQswCQYDVQQGEwJO
-TDEWMBQGA1UECAwNTm9vcmQtSG9sbGFuZDEaMBgGA1UECgwRTWlxcmEgRW5naW5l
-ZXJpbmcxHjAcBgNVBAMMFVRyZWVTdHVkeXBsYW4gUHJlbWl1bTCCASIwDQYJKoZI
-hvcNAQEBBQADggEPADCCAQoCggEBAOD7+Nf5UBYGmIadI+kRM7vSPGA12F6cyZuZ
-O/JsdCWzZx3cCgVYt29DxHRvFVGrhGGLsoaMY9iXc9LdeO02jKqL3RoPo2kc5moT
-SNarsKZcGZXgqo5NATmdMLqQpKAy41H0ybgXZDLq5XKs9YIRlkwSpzQTNeP49mOl
-48giVX3icbpMw1TdQotalKXAtcs62o+guQJNANpjBRxPXssrmDoNXrJcAtUjNOjx
-8M+8tCmwkKwBoK8F3wWxIo04kZ9KILtybMmn4VJJ6SwLEf4StphTIoru8zS7XUt8
-3HbV3PsiyYErPlwIcobfcjwZJpub23bzetvxRvhpeIpLhrTGrPMCAwEAATANBgkq
-hkiG9w0BAQsFAAOCAQEAQwkbP6m3sdQgXEK3mYYZvvs6R/FI9QPu/9ICA+dgfj4y
-7wvL0toYYR5oXdhO9At3MYmS+0bFUmqoTS+cxsC4COpEKFbRBWwbJ3NXAw14Hx2U
-ELLqMZGJNOwNV+3ZdhADrwA++AjUqu144ObrcNUqo4+A4h9R8qj+o0J50Gvwja9R
-Uh67LsF4Ls8fUtqzpqct94bUl6MPMHlH4qpZlgndmQdgOwLWeQEmM8X3WtSJH90S
-n8FqBInMBhGu1uz0Qeo09ke0RHRnghP9EXfig/veMegASZeEhFqmS2Bdiy6gqeZ5
-Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
------END CERTIFICATE-----";
-
-    /**
-     * Cached status
-     * @var object
-     */
-    private static $cachedpremiumstatus = null;
-
-    /**
-     * Check if premium is supported
-     * @return bool
-     */
-    public static function supported() {
-        return self::$premiumsupported;
-    }
-
-    /**
-     * Decrypt encrypted data
-     * @param string $encrypted Encrypted data
-     */
-    private static function decrypt($encrypted) {
-        // Get the public key.
-        $key = \openssl_get_publickey(self::$premiumcrt);
-        if ($key === false) {
-            throw new \ParseError("Error parsing public key data)");
-        }
-        // Determine the key size.
-        $keysize = \openssl_pkey_get_details($key)["bits"];
-        $blocksize = ($keysize / 8); // Bits / 8. Whether padded or not.
-
-        // Decode data in.
-        $b64 = \base64_decode($encrypted);
-        if ($b64 === false) {
-            throw new \ParseError("Error in base64 decoding");
-        }
-
-        $data = \str_split($b64, $blocksize);
-        $decrypted = "";
-        $i = 0;
-        foreach ($data as $chunk) {
-            if (\openssl_public_decrypt($chunk, $dchunk, $key, \OPENSSL_PKCS1_PADDING)) {
-                $decrypted .= $dchunk;
-            } else {
-                throw new \ParseError("Error decrypting chunk $i ({$blocksize} bytes)");
-            }
-            $i++;
-        }
-
-        // Deprecated in PHP 8.0 and up, but included to be compatible with 7.4.
-        if (\PHP_MAJOR_VERSION < 8) {
-            \openssl_pkey_free($key);
-        }
-
-        return $decrypted;
-    }
-
-    /**
-     * Trim headers from key data
-     * @param string $data the key dat with headers
-     * @return string Key without headers
-     */
-    private static function trim_headers($data) {
-        // Headers are repeated in this function for easier testing and copy-pasting into other projects.
-        $startheader   = "----- BEGIN ACTIVATION KEY -----";
-        $endheader     = "----- END ACTIVATION KEY -----";
-
-        $parts = preg_split("/\r?\n/", \trim($data));
-        if (count($parts) > 2) {
-            $start = -1;
-            $end = -1;
-            for ($i = 0; $i < count($parts); $i++) {
-                // Make sure all unicode spaces are converted to normal spaces before comparing.
-                $p = trim(preg_replace('/\s+/u', ' ', $parts[$i]));
-
-                if ($p == $startheader) {
-                    $start = $i + 1;
-                }
-                if ($start > 0 && $p == $endheader) {
-                    $end = $i;
-                }
-            }
-
-            if ($start < 0 || $end < 0 || $end - $start <= 0) {
-                throw new \ParseError("Invalid activation key wrappers");
-            } else {
-                $keyslice = array_slice($parts, $start, $end - $start);
-                return implode("\n", $keyslice);
-            }
-        } else {
-            throw new \ParseError("Invalid activation key");
-        }
-    }
-
-    /**
-     * Check if premium status is enabled
-     * @return bool
-     */
-    public static function enabled() {
-        if (self::$premiumsupported) {
-            $status = self::premiumstatus();
-            return $status->enabled;
-        } else {
-            return true;
-        }
-    }
-
-    /**
-     * Check if the premium key includes a specific intent in addition to the treestudyplan.
-     * @param string $intent The intent to search for
-     * @return bool
-     */
-    public static function has_intent($intent) {
-        $status = self::premiumstatus();
-        if ($status->enabled) {
-            return \in_array(\strtolower($intent), $status->intents);
-        } else {
-            return false;
-        }
-    }
-
-    /**
-     * Generate debug info.
-     */
-    public static function debuginfo() {
-        $s = "<pre>";
-        try {
-            $activationkey = \get_config("local_treestudyplan", "premium_key");
-            if (strlen($activationkey) > 0) {
-                $keydata = self::trim_headers($activationkey);
-                $json = self::decrypt($keydata);
-                $s .= "Decoded key data:\n----\n";
-                $s .= $json . "\n----\n";
-                $decoded = \json_decode($json, false);
-                $s .= "Read as object:\n----\n";
-                $s .= \json_encode($decoded, \JSON_PRETTY_PRINT) ."\n----\n";
-                $status = self::premiumstatus();
-                $s .= "Parsed premium status block:\n----\n";
-                $s .= \json_encode($status, \JSON_PRETTY_PRINT) ."\n----\n";
-                $s .= "Message: " . self::statusdescription() . "\n";
-            } else {
-                $s .= "Premium key empty";
-            }
-        } catch (\Throwable $x) {
-            $s .= "!!! " . get_class($x) . ": " . $x->getCode() . " | " . $x->getMessage(). "\n";
-            $stack = explode("\n", $x->getTraceAsString());
-            foreach ($stack as $l) {
-                $s .= "    " . trim($l) ."\n";
-            }
-        }
-
-        $s .= "</pre>";
-        return $s;
-    }
-
-    /**
-     * Determine, cache and retrieve premium status
-     * @return object
-     */
-    protected static function premiumstatus() {
-        if (!isset(self::$cachedpremiumstatus)) {
-
-            // Initialize default object.
-            $o = new \stdClass;
-            $o->enabled = false;
-            $o->intents = [];
-            $o->name = "";
-            $o->website = "";
-            $o->expires = "";
-            $o->expired = false;
-            $o->issued = "";
-            try {
-                $activationkey = \get_config("local_treestudyplan", "premium_key");
-                if (strlen($activationkey) > 0) {
-
-                    $keydata = self::trim_headers($activationkey);
-                    $json = self::decrypt($keydata);
-                    $decoded = \json_decode($json, false);
-
-                    if (is_object($decoded)) {
-
-                        // Copy basic data/.
-                        $keys = ["name", "website", "expires", "issued"];
-                        foreach ($keys as $k) {
-                            if (isset($decoded->$k)) {
-                                $o->$k = $decoded->$k;
-                            }
-                        }
-
-                        if (!empty($decoded->intent)) {
-                            $o->intents = explode(",", $decoded->intent);
-                        }
-
-                        // Convert dates to DateTime for.
-                        $now = new \DateTime();
-                        $issuedate = new \DateTime($o->issued);
-                        if ($o->expires == 'never') {
-                            // If expiry date == never.
-                            $expirydate = new \DateTime(); // Default to now and add a year.
-                            $expirydate->add(new \DateInterval("P1Y"));
-                        } else {
-                            try {
-                                $expirydate = new \DateTime($o->expires);
-                            } catch (\Exception $x) {
-                                $expirydate = new \DateTime(); // Default to now.
-                            }
-                        }
-
-                        if (\in_array('treestudyplan', $o->intents)
-                            && !empty($o->issued)
-                            && self::website_match($o->website)
-                            ) {
-                            if ($expirydate > $now) {
-                                $o->enabled = true;
-                                $o->expired = false;
-                            } else {
-                                $o->expired = true;
-                                $o->enabled = false;
-                            }
-                            // Format dates localized.
-                            $o->issued = \userdate($issuedate->getTimestamp(), \get_string('strftimedate', 'langconfig'));
-                            if ($o->expires == "never") {
-                                $o->expires = \get_string("premium:never", 'local_treestudyplan');
-                            } else {
-                                $o->expires = \userdate($expirydate->getTimestamp(), \get_string('strftimedate', 'langconfig'));
-                            }
-                        }
-                    }
-                }
-            } catch (\ParseError $x) {
-                $o->status = \get_string("premium:invalidactivationcontent", "local_treestudyplan");
-            }
-            self::$cachedpremiumstatus = $o;
-
-        }
-        return self::$cachedpremiumstatus;
-    }
-
-    /**
-     * Check if the current site matches the provided key
-     * @param string $key Website pattern to match against
-     */
-    private static function website_match($key) {
-        global $CFG;
-        $site = $CFG->wwwroot;
-
-         // Add double slashes to key and site if no scheme is set.
-        // Basically: if no double slashes present before any dots, slashes or @s.
-        if (!\preg_match_all('#^[^./@]*?//#', $key)) {
-            $key = "//".$key;
-        }
-        if (!\preg_match_all('#^[^./@]*?//#', $site)) {
-            $site = "//".$site;
-        }
-        // Use parse_url() to split path and host.
-        $keyurl = (object)\parse_url($key);
-        $siteurl = (object)\parse_url($site);
-
-        // No match if host is empty on key or site.
-        if (empty($keyurl->host) || empty($siteurl->host)) {
-            return false;
-        }
-
-        if ($keyurl->host == "*") {
-            // Value * matches all.
-            return true;
-        }
-
-        // First match the host part.
-        $keyparts = \array_reverse(\explode(".", $keyurl->host));
-        $siteparts = \array_reverse(\explode(".", $siteurl->host));
-
-        // Trim starting www from both parts, since site.domain and www.site.domain should be treated as the same.
-        if (($x = \array_pop($keyparts)) != "www") {
-            \array_push($keyparts, $x);
-        }
-        if (($x = \array_pop($siteparts)) != "www") {
-            \array_push($siteparts, $x);
-        }
-
-        for ($i = 0; $i < count($keyparts); $i++) {
-            // No match if the site does not have a part, but the key does. Unless the key part is .
-            if (!isset($siteparts[$i])) {
-                if ($keyparts[$i] != "*") {
-                    return false;
-                } else {
-                    $i++; // Increment $i by one before break, to make sure the comparison following this loop holds.
-                    break; // Stop comparison. Host part matches.
-                }
-            }
-
-            // Now do a proper case insensitive check for matching.
-            // Uses fnmatch to easily handle shell type wildcards.
-            if (! \fnmatch($keyparts[$i], $siteparts[$i], \FNM_CASEFOLD)) {
-                return false;
-            }
-        }
-        // Fail if the site has a deeper subdomain than the key, unless the deepest key subdomain is .
-        if ($keyparts[$i - 1] != '*' && count($siteparts) > ($i)) {
-            return false;
-        }
-
-        // If we made it here then the host part matches. Now check the path.
-        // If path is /*, matches all subpaths including /.
-        $keypath = empty($keyurl->path) ? "/" : $keyurl->path;
-        $sitepath = empty($siteurl->path) ? "/" : $siteurl->path;
-
-        // Trim trailing / from both paths before comparison.
-        if (\strlen($sitepath) > 1) {
-            $sitepath = \rtrim($sitepath, "/");
-        }
-        if (\strlen($keypath) > 1) {
-            $keypath = \rtrim($keypath, "/");
-        }
-
-        // Do a case insensitive fnmatch on the site so wildcards are matched too.
-        return \fnmatch($keypath, $sitepath, \FNM_CASEFOLD);
-    }
-
-    /**
-     * Parameter description for webservice function get_premiumstatus
-     */
-    public static function get_premiumstatus_parameters(): \external_function_parameters {
-        return new \external_function_parameters([]);
-    }
-
-    /**
-     * Return value description for webservice function get_premiumstatus
-     */
-    public static function get_premiumstatus_returns(): \external_description {
-        return new \external_single_structure([
-            "enabled"   => new \external_value(PARAM_BOOL, 'premium status enabled'),
-            "website"   => new \external_value(PARAM_TEXT, 'premium registration website'),
-            "name"      => new \external_value(PARAM_TEXT, 'premium registration name'),
-            "expires"   => new \external_value(PARAM_TEXT, 'premium registration expiry date'),
-            "expired"   => new \external_value(PARAM_BOOL, 'premium status expired'),
-            "intents"   => new \external_multiple_structure(
-                                new \external_value(PARAM_TEXT), 'additional intents included in the license'
-                            ),
-        ]);
-    }
-
-    /**
-     * Get premium status information for webservice
-     * @return object
-     */
-    public static function get_premiumstatus() {
-        if (self::$premiumsupported) {
-            $status = self::premiumstatus();
-            $keys = [
-                "enabled",
-                "website",
-                "name",
-                "expires",
-                "expired",
-                "intents",
-            ];
-
-            $result = [];
-            foreach ($keys as $param) {
-                $result[$param] = $status->$param;
-            }
-            return $result;
-        } else {
-            return [
-                "enabled" => true,
-                "website" => '*',
-                "name" => '*',
-                "expires" => '',
-                "expired" => false,
-                "intents" => [],
-            ];
-        }
-    }
-
-    /**
-     * Get a descriptive text of the current premium status
-     * @return string HTML description of premium status.
-     */
-    public static function statusdescription() {
-        $status = self::premiumstatus();
-
-        $msg = new \stdClass;
-        $msg->name = $status->name;
-        $msg->issued = $status->issued;
-        $msg->expires = $status->expires;
-        if ($status->website != "*") {
-            $msg->sitestatus = \get_string("premium:onsite", 'local_treestudyplan', $status);
-        } else {
-            $msg->sitestatus = \get_string("premium:anywhere", 'local_treestudyplan');
-        }
-
-        if ($status->enabled) {
-            return \get_string("premium:active", 'local_treestudyplan', $msg);
-        } else if ($status->expired) {
-            return \get_string("premium:expired", 'local_treestudyplan', $msg);
-        } else if (!self::website_match($status->website)) {
-            return \get_string("premium:siteinvalid", 'local_treestudyplan', $status->website);
-        } else {
-            return \get_string("premium:notregistered", 'local_treestudyplan', $msg);
-        }
-    }
-
-    /**
-     * Throw an error if premium status is not enabled
-     * @param string $message Message translation key to use in exception
-     */
-    public static function require_premium($message="premiumfeature:warning") {
-        if (! self::enabled()) {
-            throw new \moodle_exception($message, "local_treestudyplan");
-        }
-    }
-
-}
diff --git a/classes/studentstudyplanservice.php b/classes/studentstudyplanservice.php
index 8f2b456..5bdc017 100644
--- a/classes/studentstudyplanservice.php
+++ b/classes/studentstudyplanservice.php
@@ -556,7 +556,7 @@ class studentstudyplanservice extends \external_api {
         \external_api::validate_context(\context_system::instance());
 
         // Return empty list if coach role not enabled.
-        if (! (premium::enabled() && \get_config("local_treestudyplan", "enablecoach"))) {
+        if (! (\get_config("local_treestudyplan", "enablecoach"))) {
             return [];
         }
 
diff --git a/classes/studyplan.php b/classes/studyplan.php
index fd869b4..9af12df 100644
--- a/classes/studyplan.php
+++ b/classes/studyplan.php
@@ -810,7 +810,7 @@ class studyplan {
     public function is_coach($user=null) {
         global $DB, $USER;
 
-        if (! (premium::enabled() && \get_config("local_treestudyplan", "enablecoach"))) {
+        if (! (\get_config("local_treestudyplan", "enablecoach"))) {
             // If coach role is not available, return false immediately.
             return false;
         }
diff --git a/coach.php b/coach.php
index f64ef87..3f6686b 100644
--- a/coach.php
+++ b/coach.php
@@ -23,7 +23,6 @@
 
 require_once("../../config.php");
 
-use local_treestudyplan\premium;
 
 require_once($CFG->libdir.'/weblib.php');
 
@@ -37,7 +36,6 @@ $PAGE->set_context($systemcontext);
 $PAGE->set_title(get_string('coaching_plans', 'local_treestudyplan'));
 $PAGE->set_heading(get_string('coaching_plans', 'local_treestudyplan'));
 
-premium::require_premium();
 if (! (\get_config("local_treestudyplan", "enablecoach"))) {
     throw new \moodle_exception("error:coachdisabled", "local_treestudyplan");
 }
diff --git a/db/services.php b/db/services.php
index 3753403..4946b6f 100644
--- a/db/services.php
+++ b/db/services.php
@@ -754,18 +754,6 @@ $functions = [
         'capabilities'  => 'local/treestudyplan:viewuserreports',
         'loginrequired' => true,
     ],
-    /***************************
-     * Premium status functions
-     ***************************/
-    'local_treestudyplan_premiumstatus' => [         // Web service function name.
-        'classname'     => '\local_treestudyplan\premium',  // Class containing the external function.
-        'methodname'    => 'get_premiumstatus',          // External function name.
-        'description'   => 'Retrieve premium status info',
-        'type'          => 'read',                  // Database rights of the web service function (read, write).
-        'ajax'          => true,
-        'capabilities'  => '',
-        'loginrequired' => false,
-    ],
     /***************************
      * Studyline enrollment functions
      ***************************/
diff --git a/doc/advanced.htm b/doc/advanced.htm
index 02d0d12..2ddf845 100644
--- a/doc/advanced.htm
+++ b/doc/advanced.htm
@@ -139,13 +139,13 @@
         </tr>
         <tr>
             <td>local/treestudyplan:lineunenrol</td>
-            <td>(Premium feature related) Users with this right in addition to <i>viewuserreports</i> can unregister students from an registerable line</td>
+            <td>Users with this right in addition to <i>viewuserreports</i> can unregister students from an registerable line</td>
             <td>manager</td>
             <td>System and/or category</td>
         </tr>
         <tr>
             <td>local/treestudyplan:coach</td>
-            <td>(Premium feature related) Users with this right can be selected as coaches in the given context</td>
+            <td>Users with this right can be selected as coaches in the given context</td>
             <td>manager</td>
             <td>System and/or category</td>
         </tr>
diff --git a/edit-plan.php b/edit-plan.php
index ef21b2f..9e8cd15 100644
--- a/edit-plan.php
+++ b/edit-plan.php
@@ -166,7 +166,7 @@ print <<<END
                 <b-button
                         variant='danger' href='#' role='presentation' @click="importStudyplan "
                     ><i class='fa fa-upload'></i> {{ text.advanced_import_from_file }}</b-button
-                ><mform v-if="premiumenabled && templatecount > 0"
+                ><mform v-if="templatecount > 0"
                     name="studyplan_fromtemplateform"
                     :params="{contextid: contextid }"
                     @saved="onStudyPlanCreated"
diff --git a/lang/en/local_treestudyplan.php b/lang/en/local_treestudyplan.php
index 968b9b1..0cbad10 100644
--- a/lang/en/local_treestudyplan.php
+++ b/lang/en/local_treestudyplan.php
@@ -474,31 +474,6 @@ $string["error:nostudyplaneditaccess"] = 'Error: You do not have access to manag
 $string["error:nocategoriesvisible"] = 'Error: You have no viewing permissions in any category. Therefore the course list remains empty.';
 $string["error:usernotassociated"] = 'Error: Requested student is not associated with this studyplan';
 
-$string["premium:never"] = 'never';
-$string["premium:anywhere"] = 'for use anywhere';
-$string["premium:onsite"] = 'for use on site <b>{$a->website}</b>';
-$string["premium:active"] = 'Premium access <b class="text-success">enabled</b>.<br> Registered to <b>{$a->name}</b> {$a->sitestatus}<br>Expires <b>{$a->expires}</b>';
-$string["premium:notregistered"] = 'Premium access <b>disabled</b> ';
-$string["premium:invalidactivationcontent"] = 'Premium activation key not recognized';
-$string["premium:siteinvalid"] = 'Premium access <b>disabled</b>. Activation key is only valid for use on <b>{$a}</b>';
-$string["premium:expired"] = 'Premium access <b class="text-danger">expired</b> on <b>{$a->expires}</b><br>Was registered to <b>{$a->name}</b> {$a->sitestatus}';
-$string["settingspage_premium"] = 'Premium registration';
-$string["setting_premium_heading"] = 'Premium features';
-$string["settingdesc_premium_heading"] = 'To access premium features, you need a registration key.
-<br>Premium features include:
-<ul>
-<li>Overview of grades for all students in a studyplan.</li>
-<li>Rows in a studyplan which a student can choose to unlock.</li>
-<li>Coach role, which allows a linked coach to follow student progress and limited options to make changes to the studyplan content.</li>
-</ul>';
-$string["setting_premium_status"] = 'Current premium status';
-$string["setting_premium_key"] = 'Activation key';
-$string["settingdesc_premium_key"] = 'Paste the premium key you received in the box above.<br> <b>Attention!</b> The lines  <i>----- BEGIN ACTIVATION KEY -----</i> and <i>----- END ACTIVATION KEY -----</i> are part of the key.';
-$string["setting_premium_debug"] = 'Debug info for premium key';
-
-$string["premiumfeature:morestudyplans"] = 'Creating more than 5 studyplans in a single category is a premium feature.';
-$string["premiumfeature:morecategories"] = 'Creating studyplans in more than 20 categories is a premium feature.';
-$string["premiumfeature:warning"] = 'The features on this page are only accessible if your site has premium features enabled.';
 $string["error:coachdisabled"] = "The coach page has been disabled by the system administrator";
 $string["overall"] = 'Course';
 $string["studyplan_report"] = 'Studyplan result overview';
diff --git a/lang/nl/local_treestudyplan.php b/lang/nl/local_treestudyplan.php
index 8ff5648..88d9851 100644
--- a/lang/nl/local_treestudyplan.php
+++ b/lang/nl/local_treestudyplan.php
@@ -475,31 +475,6 @@ $string["error:nostudyplaneditaccess"] = 'Fout: Je hebt geen rechten om studiepl
 $string["error:nocategoriesvisible"] = 'Fout: Je kunt geen cursussen in een categorie bekijken. Daarom blijft de cursuslijst leeg';
 $string["error:usernotassociated"] = 'Fout: De gevraagde student is niet gekoppeld aan dit studieplan';
 
-$string["premium:never"] = 'nooit';
-$string["premium:anywhere"] = 'voor gebruik overal';
-$string["premium:onsite"] = 'voor gebruik op {$a->website}';
-$string["premium:active"] = 'Premium toegang <b class="text-success">ingeschakeld</b>.<br>Uitgegeven aan <b>{$a->name}</b> {$a->sitestatus}<br>Verloopt op<b>{$a->expires}</b>';
-$string["premium:notregistered"] = 'Premium toegang staat <b>uitgeschakeld</n>';
-$string["premium:invalidactivationcontent"] = 'Premium activeringssleutel niet herkend';
-$string["premium:siteinvalid"] = 'Premium toegang staat <b>uitgeschakeld</n>. Activeringssleutel is alleen voor gebruik op <b>{$a}</b>';
-$string["premium:expired"] = 'Premium toegang is <b class="text-danger">verlopen</b> op <b>{$a->expires}</b><br>Was uitgegeven aan <b>{$a->name}</b> {$a->sitestatus}';
-$string["settingspage_premium"] = 'Premium registratie';
-$string["setting_premium_heading"] = 'Premium features';
-$string["settingdesc_premium_heading"] = 'Voor premium toegang is een activeringssleutel vereist.
-<br>Premium toegang bevat onder andere:
-<ul>
-<li>Overzichtsrapport van alle resultaten van studenten in een studieplan.</li>
-<li>Leerlijnen die student kan ontsluiten.</li>
-<li>Coach rol, waarbij een coach gekoppeld kan worden aan een studieplan, de voortgang van studenten hierin kan volgen en de inhoud hiervan beperkt kan aanpassen.</li>
-</ul>';
-$string["setting_premium_status"] = 'Premium status';
-$string["setting_premium_key"] = 'Activatiesleutel';
-$string["settingdesc_premium_key"] = 'Plak de activatiesleutel in het tekstvak hierboven.<br> <b>Let op!</b> De regels <i>----- BEGIN ACTIVATION KEY -----</i> en <i>----- END ACTIVATION KEY -----</i> zijn onderdeel van de sleutel.';
-$string["setting_premium_debug"] = 'Debug info voor premium key';
-
-$string["premiumfeature:morestudyplans"] = 'Meer dan 5 studieplannen in één categorie aanmaken kan alleen met premium toegang.';
-$string["premiumfeature:morecategories"] = 'In meer dan 20 categoriën een studieplan aanmaken kan alleen met premium toegang.';
-$string["premiumfeature:warning"] = 'De functies in deze pagina kun je alleen gebruiken met premium toegang.';
 $string["error:coachdisabled"] = "De coach functie is uitgeschakeld";
 $string["overall"] = 'Cursus voltooid';
 $string["studyplan_report"] = 'Studieplan resultatenoverzicht';
diff --git a/lib.php b/lib.php
index 4eae663..abbf987 100644
--- a/lib.php
+++ b/lib.php
@@ -25,7 +25,6 @@
  require_once($CFG->dirroot.'/course/modlib.php');
 
 use local_treestudyplan\local\helpers\webservicehelper;
-use local_treestudyplan\premium;
 use local_treestudyplan\studyplan;
 use local_treestudyplan\studyplanpage;
 
@@ -56,7 +55,7 @@ function local_treestudyplan_autofill_customusermenuitems() {
             "/local/treestudyplan/view-plan.php" => ["included" => false, "strkey" => "link_viewplan"],
             "/local/treestudyplan/edit-plan.php" => ["included" => false, "strkey" => "link_editplan"],
         ];
-        if ((premium::enabled() && \get_config("local_treestudyplan", "enablecoach"))) {
+        if (\get_config("local_treestudyplan", "enablecoach")) {
             // Also include the coach role if enabled.
             $navitems["/local/treestudyplan/coach.php"] = ["included" => false, "strkey" => "link_coach"];
         }
@@ -203,7 +202,7 @@ function local_treestudyplan_extend_navigation(global_navigation $navigation) {
                      INNER JOIN {local_treestudyplan} t ON c.studyplan_id = t.id
                      WHERE c.user_id = :user_id";
 
-        if ((premium::enabled() && \get_config("local_treestudyplan", "enablecoach")) &&
+        if (\get_config("local_treestudyplan", "enablecoach") &&
              (has_capability('local/treestudyplan:coach', context_system::instance())
              || webservicehelper::has_capability_in_any_category('local/treestudyplan:coach')
              ) && $DB->count_records_sql($coachsql, ["user_id" => $USER->id]) > 0
diff --git a/result-overview.php b/result-overview.php
index 27a98b6..34cc299 100644
--- a/result-overview.php
+++ b/result-overview.php
@@ -25,7 +25,6 @@ require_once("../../config.php");
 
 use local_treestudyplan\contextinfo;
 use local_treestudyplan\studyplanpage;
-use local_treestudyplan\premium;
 
 require_once($CFG->libdir.'/weblib.php');
 
@@ -48,10 +47,6 @@ $PAGE->set_pagelayout('report');
 $PAGE->set_title(get_string('studyplan_report', 'local_treestudyplan'));
 $PAGE->set_heading(get_string('studyplan_report', 'local_treestudyplan'));
 
-if (!premium::enabled()) {
-    throw new \moodle_exception("error:nopremiumaccess", "local_treestudyplan", "", premium::statusdescription());
-}
-
 if (!has_capability('local/treestudyplan:viewuserreports', $context)) {
     throw new \moodle_exception("error:nostudyplanviewaccess", "local_treestudyplan", "", $contextname);
 }
diff --git a/settings.php b/settings.php
index 531d344..388062f 100644
--- a/settings.php
+++ b/settings.php
@@ -25,7 +25,6 @@
 defined('MOODLE_INTERNAL') || die();
 
 use local_treestudyplan\aggregator;
-use local_treestudyplan\premium;
 
 if ($hassiteconfig) {
 
@@ -158,13 +157,11 @@ if ($hassiteconfig) {
         false,
     ));
 
-    if (premium::enabled()) {
-        $page->add(new admin_setting_configcheckbox('local_treestudyplan/enablecoach',
-            get_string('setting_enablecoach', 'local_treestudyplan'),
-            get_string('settingdesc_enablecoach', 'local_treestudyplan'),
-            false,
-        ));
-    }
+    $page->add(new admin_setting_configcheckbox('local_treestudyplan/enablecoach',
+        get_string('setting_enablecoach', 'local_treestudyplan'),
+        get_string('settingdesc_enablecoach', 'local_treestudyplan'),
+        false,
+    ));
 
     $page->add(new admin_setting_configselect('local_treestudyplan/display_field',
             get_string('setting_display_field', 'local_treestudyplan'),
@@ -382,44 +379,4 @@ if ($hassiteconfig) {
         'local_treestudyplan_doc',
         get_string('cfg_help', 'local_treestudyplan', null, true),
         $CFG->wwwroot . '/local/treestudyplan/doc.php/index.htm'));
-
-    /**************************************
-     *
-     * Settings page: Premium registration
-     *
-     *************************************/
-    if (\local_treestudyplan\premium::supported() || $CFG->debugdeveloper) {
-        $pagepremium = new admin_settingpage('local_treestudyplan_settings_premium',
-        get_string('settingspage_premium', 'local_treestudyplan', null, true));
-
-        // Description heading.
-        $pagepremium->add(new admin_setting_heading('local_treestudyplan/premium_heading',
-            get_string('setting_premium_heading', 'local_treestudyplan'),
-            get_string('settingdesc_premium_heading', 'local_treestudyplan')
-        ));
-
-        // Description heading.
-        $pagepremium->add(new admin_setting_description('local_treestudyplan/premium_status',
-            get_string('setting_premium_status', 'local_treestudyplan'),
-            premium::statusdescription() . "<br>&nbsp;<br>" // Add empty row at end.
-        ));
-
-        $pagepremium->add(new admin_setting_configtextarea('local_treestudyplan/premium_key',
-            get_string('setting_premium_key', 'local_treestudyplan'),
-            get_string('settingdesc_premium_key', 'local_treestudyplan'),
-            "",
-            PARAM_RAW
-        ));
-
-        if ($CFG->debugdeveloper) {
-            // Show decrypted key data.
-            $pagepremium->add(new admin_setting_description('local_treestudyplan/premium_debug',
-                get_string('setting_premium_debug', 'local_treestudyplan'),
-                premium::debuginfo() . "<br>&nbsp;<br>" // Add empty row at end.
-            ));
-        }
-
-        // Add settings page2 to the admin settings category.
-        $ADMIN->add('local_treestudyplan', $pagepremium);
-    }
 }