move requests to backend (#18)

.gitignore

@@ -3,3 +3,6 @@ build/
 coverage/
 node_modules/
 vendor/
+
+.phpunit.cache
+.phpunit.result.cache

README.md

@@ -47,3 +47,4 @@ The current changelog can be found under [source/changelog.txt](source/changelog
 - Update PHP dependencies: `composer update`
 - Check for direct PHP dependency updates: `composer outdated --direct`
 - Format code with prettier: `npm run format`
+- Generate `vendor/autoload.php` file after creating new class: `composer dump-autoload`

composer.json

@@ -1 +1,10 @@
-{}
+{
+  "autoload": {
+    "psr-4": {
+      "MobilizonConnector\\": "source/includes/"
+    }
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9.6"
+  }
+}

gulpfile.cjs

@@ -11,9 +11,8 @@ function injectMetadata() {
   return src(
     [
       FOLDER_BUILD + '/front/block-events-loader.js',
-      FOLDER_BUILD + '/front/events-loader.js',
       FOLDER_BUILD + '/' + PACKAGE.name + '.php',
-      FOLDER_BUILD + '/includes/constants.php',
+      FOLDER_BUILD + '/includes/Constants.php',
       FOLDER_BUILD + '/readme.txt',
     ],
     { base: './' },

package.json

@@ -12,7 +12,7 @@
     "eslint": "npx eslint source/**/*.js",
     "format": "npx prettier --write .",
     "prepare": "husky install",
-    "test": "ava"
+    "test": "ava && ./vendor/bin/phpunit"
   },
   "author": {
     "name": "Daniel Waxweiler",

phpunit.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheResultFile=".phpunit.cache/test-results"
+         executionOrder="depends,defects"
+         forceCoversAnnotation="false"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         convertDeprecationsToExceptions="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <coverage cacheDirectory=".phpunit.cache/code-coverage"
+              processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">source/includes</directory>
+        </include>
+    </coverage>
+</phpunit>

source/changelog.txt

@@ -1,9 +1,12 @@
 ### [Unreleased]
 #### Added
+- Display name of group when it cannot be found
 #### Changed
+- Let backend do requests to API of Mobilizon instance for increased privacy
 #### Deprecated
 #### Removed
 #### Fixed
+- Fix displaying more than one block in the editor
 #### Security
 
 ### [0.11.5]

source/connector-mobilizon.php

@@ -10,11 +10,18 @@
  * License:           <wordpress-license>
  */
 
-require_once __DIR__ . '/includes/constants.php';
+require_once __DIR__ . '/includes/exceptions/GeneralException.php';
-require_once __DIR__ . '/includes/settings.php';
+require_once __DIR__ . '/includes/exceptions/GroupNotFoundException.php';
-require_once __DIR__ . '/includes/events-list-block.php';
+require_once __DIR__ . '/includes/Constants.php';
-require_once __DIR__ . '/includes/events-list-shortcut.php';
+require_once __DIR__ . '/includes/Api.php';
-require_once __DIR__ . '/includes/events-list-widget.php';
+require_once __DIR__ . '/includes/EventsCache.php';
+require_once __DIR__ . '/includes/Settings.php';
+require_once __DIR__ . '/includes/DateTimeWrapper.php';
+require_once __DIR__ . '/includes/Formatter.php';
+require_once __DIR__ . '/includes/GraphQlClient.php';
+require_once __DIR__ . '/includes/EventsListBlock.php';
+require_once __DIR__ . '/includes/EventsListShortcut.php';
+require_once __DIR__ . '/includes/EventsListWidget.php';
 
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
@@ -24,11 +31,11 @@ if (!defined('ABSPATH')) {
 final class Mobilizon_Connector {
 
   private function __construct() {
+    add_action('init', [$this, 'register_api']);
     add_action('init', [$this, 'register_blocks']);
     add_action('init', [$this, 'register_settings'], 1); // required for register_blocks
     add_action('init', [$this, 'register_shortcut']);
     add_action('widgets_init', [$this, 'register_widget']);
-    add_action('wp_enqueue_scripts', [$this, 'register_scripts']);
     register_activation_hook(__FILE__, [$this, 'enable_activation']);
   }
 
@@ -49,12 +56,15 @@ final class Mobilizon_Connector {
     $settings = array(
       'isShortOffsetNameShown' => MobilizonConnector\Settings::isShortOffsetNameShown(),
       'locale' => str_replace('_', '-', get_locale()),
-      'timeZone' => wp_timezone_string(),
+      'timeZone' => wp_timezone_string()
-      'url' => MobilizonConnector\Settings::getUrl()
     );
     wp_add_inline_script($scriptName, 'var MOBILIZON_CONNECTOR = ' . json_encode($settings), 'before');
   }
 
+  public function register_api() {
+    MobilizonConnector\Api::init();
+  }
+
   public function register_blocks() {
     $scriptName = MobilizonConnector\EventsListBlock::initAndReturnScriptName();
     $this->load_settings_globally_before_script($scriptName);
@@ -64,12 +74,6 @@ final class Mobilizon_Connector {
     MobilizonConnector\Settings::init();
   }
 
-  public function register_scripts() {
-    $name = MobilizonConnector\NAME . '-js';
-    wp_enqueue_script($name, plugins_url('front/events-loader.js', __FILE__ ));
-    $this->load_settings_globally_before_script($name);
-  }
-
   public function register_shortcut() {
     MobilizonConnector\EventsListShortcut::init();
   }

source/front/blocks/events-list/edit.js

@@ -1,75 +1,101 @@
 /* eslint-disable @wordpress/i18n-ellipsis */
-import { loadEventList } from '../../events-loader.js'
+import {
+  clearEventsList,
+  displayErrorMessage,
+  displayEvents,
+  hideErrorMessages,
+  showLoadingIndicator,
+} from '../../events-displayer.js'
 
 const { InspectorControls, useBlockProps } = wp.blockEditor
-const { PanelBody } = wp.components
+const { Panel, PanelBody } = wp.components
 const { useEffect } = wp.element
 const { __ } = wp.i18n
 
 const NAME = '<wordpress-name>'
 
-let timer
-
 export default ({ attributes, setAttributes }) => {
+  let timer
   const blockProps = useBlockProps({
     className: NAME + '_events-list',
-    'data-maximum': attributes.eventsCount,
-    'data-group-name': attributes.groupName,
   })
-  function reloadEventList() {
+  function reloadEventList(eventsCount, groupName) {
     if (timer) {
       clearTimeout(timer)
     }
-    timer = setTimeout(() => {
+    timer = setTimeout(async () => {
       const container = document.getElementById(blockProps.id)
       if (container) {
-        loadEventList(container)
+        hideErrorMessages(container)
+        clearEventsList(container)
+        showLoadingIndicator(container)
+        let url = `/wp-json/connector-mobilizon/v1/events?eventsCount=${eventsCount}`
+        if (groupName) {
+          url += `&groupName=${groupName}`
+        }
+        await fetch(url)
+          .then((response) => response.text())
+          .then((data) => {
+            const events = JSON.parse(data)
+            displayEvents({
+              events,
+              document,
+              container,
+              maxEventsCount: eventsCount,
+            })
+          })
+          .catch((data) => {
+            displayErrorMessage({ data, container })
+          })
       }
     }, 500)
   }
   useEffect(() => {
-    reloadEventList()
+    reloadEventList(attributes.eventsCount, attributes.groupName)
   }, [])
   function updateEventsCount(event) {
     let newValue = Number(event.target.value)
     if (newValue < 1) newValue = 1
     setAttributes({ eventsCount: newValue })
-    reloadEventList()
+    reloadEventList(newValue, attributes.groupName)
   }
   function updateGroupName(event) {
-    setAttributes({ groupName: event.target.value })
+    const newValue = event.target.value
-    reloadEventList()
+    setAttributes({ groupName: newValue })
+    reloadEventList(attributes.eventsCount, newValue)
   }
   return [
     <InspectorControls>
-      <PanelBody title={__('Events List Settings', '<wordpress-name>')}>
+      <Panel>
-        <label
+        <PanelBody title={__('Events List Settings', '<wordpress-name>')}>
-          className="components-base-control__label"
+          <label
-          htmlFor={NAME + '_events-count'}
+            className="components-base-control__label"
-        >
+            htmlFor={NAME + '_events-count'}
-          {__('Number of events to show', '<wordpress-name>')}
+          >
-        </label>
+            {__('Number of events to show', '<wordpress-name>')}
-        <input
+          </label>
-          className="components-text-control__input"
+          <input
-          type="number"
+            className="components-text-control__input"
-          value={attributes.eventsCount}
+            type="number"
-          onChange={updateEventsCount}
+            value={attributes.eventsCount}
-          id={NAME + '_events-count'}
+            onChange={updateEventsCount}
-        />
+            id={NAME + '_events-count'}
-        <label
+          />
-          className="components-base-control__label"
+          <label
-          htmlFor={NAME + '_group-name'}
+            className="components-base-control__label"
-        >
+            htmlFor={NAME + '_group-name'}
-          {__('Group name (optional)', '<wordpress-name>')}
+          >
-        </label>
+            {__('Group name (optional)', '<wordpress-name>')}
-        <input
+          </label>
-          className="components-text-control__input"
+          <input
-          type="text"
+            className="components-text-control__input"
-          value={attributes.groupName}
+            type="text"
-          onChange={updateGroupName}
+            value={attributes.groupName}
-          id={NAME + '_group-name'}
+            onChange={updateGroupName}
-        />
+            id={NAME + '_group-name'}
-      </PanelBody>
+          />
+        </PanelBody>
+      </Panel>
     </InspectorControls>,
     <div {...blockProps}>
       <div className="general-error" style={{ display: 'none' }}>

source/front/events-displayer-test.js

@@ -18,7 +18,6 @@ test.before(() => {
 
 test.beforeEach((t) => {
   t.context.container = document.createElement('div')
-  t.context.container.setAttribute('data-maximum', '2')
 
   const errorMessageGeneral = document.createElement('div')
   errorMessageGeneral.setAttribute('class', 'general-error')
@@ -40,24 +39,20 @@ test.beforeEach((t) => {
 })
 
 test('#displayEvents one event', (t) => {
-  const data = {
+  const events = [
-    events: {
+    {
-      elements: [
+      title: 'a',
-        {
+      url: 'b',
-          title: 'a',
+      beginsOn: '2021-04-15T10:30:00Z',
-          url: 'b',
+      endsOn: '2021-04-15T15:30:00Z',
-          beginsOn: '2021-04-15T10:30:00Z',
+      physicalAddress: {
-          endsOn: '2021-04-15T15:30:00Z',
+        description: 'c',
-          physicalAddress: {
+        locality: 'd',
-            description: 'c',
+      },
-            locality: 'd',
-          },
-        },
-      ],
     },
-  }
+  ]
   const container = t.context.container
-  displayEvents({ data, document, container })
+  displayEvents({ events, document, container, maxEventsCount: 2 })
   const list = container.querySelector('ul')
   t.is(list.children[0].childNodes[0].tagName, 'A')
   t.is(list.children[0].childNodes[0].getAttribute('href'), 'b')

source/front/events-displayer.js

@@ -6,18 +6,14 @@ export function clearEventsList(container) {
   list.replaceChildren()
 }
 
-export function displayEvents({ data, document, container }) {
+export function displayEvents({ events, document, container, maxEventsCount }) {
   hideLoadingIndicator(container)
 
   const isShortOffsetNameShown =
     window.MOBILIZON_CONNECTOR.isShortOffsetNameShown
   const locale = window.MOBILIZON_CONNECTOR.locale
-  const maxEventsCount = container.getAttribute('data-maximum')
   const timeZone = window.MOBILIZON_CONNECTOR.timeZone
 
-  const events = data.events
-    ? data.events.elements
-    : data.group.organizedEvents.elements
   const eventsCount = Math.min(maxEventsCount, events.length)
   const list = container.querySelector('ul')
   for (let i = 0; i < eventsCount; i++) {

source/front/events-loader.js

@@ -1,38 +0,0 @@
-import {
-  clearEventsList,
-  displayEvents,
-  displayErrorMessage,
-  hideErrorMessages,
-  showLoadingIndicator,
-} from './events-displayer.js'
-import * as GraphqlWrapper from './graphql-wrapper.js'
-
-const NAME = '<wordpress-name>'
-const URL_SUFFIX = '/api'
-
-document.addEventListener('DOMContentLoaded', loadEventLists)
-
-function loadEventLists() {
-  const eventLists = document.getElementsByClassName(NAME + '_events-list')
-  for (const list of eventLists) {
-    loadEventList(list)
-  }
-}
-
-export function loadEventList(container) {
-  const url = MOBILIZON_CONNECTOR.url + URL_SUFFIX
-  const limit = parseInt(container.getAttribute('data-maximum'))
-  const groupName = container.getAttribute('data-group-name')
-  hideErrorMessages(container)
-  clearEventsList(container)
-  showLoadingIndicator(container)
-  if (groupName) {
-    GraphqlWrapper.getUpcomingEventsByGroupName({ url, limit, groupName })
-      .then((data) => displayEvents({ data, document, container }))
-      .catch((data) => displayErrorMessage({ data, container }))
-  } else {
-    GraphqlWrapper.getUpcomingEvents({ url, limit })
-      .then((data) => displayEvents({ data, document, container }))
-      .catch((data) => displayErrorMessage({ data, container }))
-  }
-}

source/includes/Api.php

@@ -0,0 +1,53 @@
+<?php
+namespace MobilizonConnector;
+
+class Api {
+  public static function init() {
+    add_action('rest_api_init', 'MobilizonConnector\Api::init_api');
+  }
+
+  public static function init_api() {
+    register_rest_route(
+      NAME . '/v1',
+      '/events',
+      [
+        'methods' => 'GET',
+        'callback' => 'MobilizonConnector\Api::get_events',
+        'args' => [
+          'eventsCount' => [
+            'required' => true,
+            'validate_callback' => function($param, $request, $key) {
+              return is_numeric($param) && $param > 0;
+            }
+          ],
+          'groupName' => [
+            'validate_callback' => function($param, $request, $key) {
+              return !is_numeric($param);
+            }
+          ]
+        ],
+        'permission_callback' => '__return_true',
+      ]
+      );
+  }
+
+  public static function get_events($request) {
+    $eventsCount = $request['eventsCount'];
+    $groupName = isset($request['groupName']) ? $request['groupName'] : '';
+
+    $url = Settings::getUrl();
+
+    try {
+      if ($groupName) {
+        $events = GraphQlClient::get_upcoming_events_by_group_name($url, (int) $eventsCount, $groupName);
+      } else {
+        $events = GraphQlClient::get_upcoming_events($url, (int) $eventsCount);
+      }
+      return $events;
+    } catch (GeneralException $e) {
+      return new \WP_Error('events_not_loading', 'The events could not be loaded!', array('status' => 500));
+    } catch (GroupNotFoundException $e) {
+      return new \WP_Error('group_not_found', sprintf('The group "%s" could not be found!', $groupName), array('status' => 404));
+    }
+  }
+}

source/includes/Constants.php

@@ -1,11 +1,6 @@
 <?php
 namespace MobilizonConnector;
 
-// Exit if this file is called directly.
-if (!defined('ABSPATH')) {
-  exit;
-}
-
 const DEFAULT_EVENTS_COUNT = 5;
 const NAME = '<wordpress-name>';
 const NICE_NAME = '<wordpress-nice-name>';

source/includes/DateTimeWrapper.php

@@ -0,0 +1,34 @@
+<?php
+namespace MobilizonConnector;
+
+final class DateTimeWrapper {
+  private $dateTime;
+  private $locale;
+  private $timeZone;
+
+  public function __construct(string $text, string $locale = 'en-GB', string $timeZone = 'utc') {
+    if (!$locale) {
+      $locale = 'en-GB';
+    }
+    if (!$timeZone) {
+      $timeZone = 'utc';
+    }
+    $this->dateTime = new \DateTime($text);
+    $this->locale = $locale;
+    $this->timeZone = new \DateTimeZone($timeZone);
+  }
+
+  public function get24Time(): string {
+    $formatter = \IntlDateFormatter::create($this->locale, \IntlDateFormatter::NONE, \IntlDateFormatter::SHORT, $this->timeZone);
+    return $formatter->format($this->dateTime);
+  }
+
+  public function getShortDate(): string {
+    $formatter = \IntlDateFormatter::create($this->locale, \IntlDateFormatter::SHORT, \IntlDateFormatter::NONE, $this->timeZone);
+    return $formatter->format($this->dateTime);
+  }
+
+  public function getTimeZoneName(): string {
+    return $this->timeZone->getName();
+  }
+}

source/includes/EventsCache.php

@@ -0,0 +1,19 @@
+<?php
+namespace MobilizonConnector;
+
+final class EventsCache {
+
+  private static $MAX_AGE_IN_S = 120;
+
+  public static function set(array $parameters, mixed $data): void {
+    // md5 is used as key must be 172 characters or fewer in length.
+    $key = md5(json_encode($parameters));
+    set_transient($key, $data, self::$MAX_AGE_IN_S);
+  }
+
+  public static function get(array $parameters): mixed {
+    $key = md5(json_encode($parameters));
+    $data = get_transient($key);
+    return $data;
+  }
+}

source/includes/EventsListBlock.php

@@ -1,11 +1,6 @@
 <?php
 namespace MobilizonConnector;
 
-// Exit if this file is called directly.
-if (!defined('ABSPATH')) {
-  exit;
-}
-
 class EventsListBlock {
 
   public static function initAndReturnScriptName(): string {
@@ -41,12 +36,29 @@ class EventsListBlock {
   }
 
   public static function render($block_attributes, $content) {
-    $classNamePrefix = NAME;
+    $url = Settings::getUrl();
     $eventsCount = $block_attributes['eventsCount'];
     $groupName = isset($block_attributes['groupName']) ? $block_attributes['groupName'] : '';
 
     ob_start();
-    require dirname(__DIR__) . '/view/events-list.php';
+    try {
+      if ($groupName) {
+        $events = GraphQlClient::get_upcoming_events_by_group_name($url, (int) $eventsCount, $groupName);
+      } else {
+        $events = GraphQlClient::get_upcoming_events($url, (int) $eventsCount);
+      }
+
+      $classNamePrefix = NAME;
+      $locale = get_locale();
+      $isShortOffsetNameShown = Settings::isShortOffsetNameShown();
+      $timeZone = wp_timezone_string();
+
+      require dirname(__DIR__) . '/view/events-list.php';
+    } catch (GeneralException $e) {
+      require dirname(__DIR__) . '/view/events-list-not-loaded.php';
+    } catch (GroupNotFoundException $e) {
+      require dirname(__DIR__) . '/view/events-list-group-not-found.php';
+    }
     $output = ob_get_clean();
     return $output;
   }

source/includes/EventsListShortcut.php

@@ -1,11 +1,6 @@
 <?php
 namespace MobilizonConnector;
 
-// Exit if this file is called directly.
-if (!defined('ABSPATH')) {
-  exit;
-}
-
 class EventsListShortcut {
   
   public static function init() {
@@ -24,12 +19,29 @@ class EventsListShortcut {
       ), $atts
     );
 
-    $classNamePrefix = NAME;
+    $url = Settings::getUrl();
     $eventsCount = $atts_with_overriden_defaults['events-count'];
     $groupName = $atts_with_overriden_defaults['group-name'];
 
     ob_start();
-    require dirname(__DIR__) . '/view/events-list.php';
+    try {
+      if ($groupName) {
+        $events = GraphQlClient::get_upcoming_events_by_group_name($url, (int) $eventsCount, $groupName);
+      } else {
+        $events = GraphQlClient::get_upcoming_events($url, (int) $eventsCount);
+      }
+
+      $classNamePrefix = NAME;
+      $locale = get_locale();
+      $isShortOffsetNameShown = Settings::isShortOffsetNameShown();
+      $timeZone = wp_timezone_string();
+
+      require dirname(__DIR__) . '/view/events-list.php';
+    } catch (GeneralException $e) {
+      require dirname(__DIR__) . '/view/events-list-not-loaded.php';
+    } catch (GroupNotFoundException $e) {
+      require dirname(__DIR__) . '/view/events-list-group-not-found.php';
+    }
     $output = ob_get_clean();
     return $output;
   }

source/includes/EventsListWidget.php

@@ -1,11 +1,6 @@
 <?php
 namespace MobilizonConnector;
 
-// Exit if this file is called directly.
-if (!defined('ABSPATH')) {
-  exit;
-}
-
 class EventsListWidget extends \WP_Widget {
 
   public function __construct() {
@@ -25,11 +20,28 @@ class EventsListWidget extends \WP_Widget {
       echo $args['before_title'].apply_filters('widget_title', $options['title']).$args['after_title'];
     }
 
-    $classNamePrefix = NAME;
+    $url = Settings::getUrl();
     $eventsCount = $options['eventsCount'];
     $groupName = isset($options['groupName']) ? $options['groupName'] : '';
 
-    require dirname(__DIR__) . '/view/events-list.php';
+    try {
+      if ($groupName) {
+        $events = GraphQlClient::get_upcoming_events_by_group_name($url, (int) $eventsCount, $groupName);
+      } else {
+        $events = GraphQlClient::get_upcoming_events($url, (int) $eventsCount);
+      }
+
+      $classNamePrefix = NAME;
+      $locale = get_locale();
+      $isShortOffsetNameShown = Settings::isShortOffsetNameShown();
+      $timeZone = wp_timezone_string();
+  
+      require dirname(__DIR__) . '/view/events-list.php';
+    } catch (GeneralException $e) {
+      require dirname(__DIR__) . '/view/events-list-not-loaded.php';
+    } catch (GroupNotFoundException $e) {
+      require dirname(__DIR__) . '/view/events-list-group-not-found.php';
+    }
 
     echo $args['after_widget'];
   }

source/includes/Formatter.php

@@ -0,0 +1,42 @@
+<?php
+namespace MobilizonConnector;
+
+final class Formatter
+{
+  public static function format_date(string $locale, string $timeZone, string $start, ?string $end, bool $isShortOffsetNameShown): string {
+    $startDateTime = new DateTimeWrapper($start, $locale, $timeZone);
+    $dateText = $startDateTime->getShortDate();
+    $dateText .= ' ' . $startDateTime->get24Time();
+    if (!$end && $isShortOffsetNameShown) {
+      $dateText .= ' (' . $startDateTime->getTimeZoneName() . ')';
+    }
+    if ($end) {
+      $endDateTime = new DateTimeWrapper($end, $locale, $timeZone);
+      if ($startDateTime->getShortDate() != $endDateTime->getShortDate()) {
+        $dateText .= ' - ';
+        $dateText .= $endDateTime->getShortDate() . ' ';
+      } else {
+        $dateText .= ' - ';
+      }
+      $dateText .= $endDateTime->get24Time();
+      if ($isShortOffsetNameShown) {
+        $dateText .= ' (' . $endDateTime->getTimeZoneName() . ')';
+      }
+    }
+    return $dateText;
+  }
+
+  public static function format_location(string $description, string $locality): string {
+    $location = '';
+    if ($description && trim($description)) {
+      $location .= trim($description);
+    }
+    if ($location && $locality) {
+      $location .= ', ';
+    }
+    if ($locality) {
+      $location .= $locality;
+    }
+    return $location;
+  }
+}

source/includes/GraphQlClient.php

@@ -0,0 +1,113 @@
+<?php
+namespace MobilizonConnector;
+
+final class GraphQlClient {
+
+  public static function query(string $endpoint, string $query, array $variables = [], ?string $token = null): array
+  {
+    $headers = ['Content-Type: application/json'];
+    if ($token !== null) {
+        $headers[] = "Authorization: bearer $token";
+    }
+
+    $context = stream_context_create([
+        'http' => [
+            'method' => 'POST',
+            'header' => $headers,
+            'content' => json_encode(['query' => $query, 'variables' => $variables]),
+        ]
+      ]);
+    $data = @file_get_contents($endpoint, false, $context);
+
+    if ($data === false) {
+      $error = error_get_last();
+      throw new \ErrorException($error['message'], $error['type']);
+    }
+
+    return json_decode($data, true);
+  }
+
+  public static function get_upcoming_events(string $url, int $limit): array {
+    $query = <<<'GRAPHQL'
+      query ($limit: Int) {
+        events(limit: $limit) {
+          elements {
+            id,
+            title,
+            url,
+            beginsOn,
+            endsOn,
+            physicalAddress {
+              description,
+              locality
+            }
+          },
+          total
+        }
+      }
+      GRAPHQL;
+
+    $cachedEvents = EventsCache::get(['url' => $url, 'query' => $query, 'limit' => $limit]);
+    if ($cachedEvents !== false) {
+      return $cachedEvents;
+    }
+
+    $endpoint = $url . '/api';
+    $data = self::query($endpoint, $query, ['limit' => $limit]);
+    self::checkData($data);
+
+    $events = $data['data']['events']['elements'];
+    EventsCache::set(['url' => $url, 'query' => $query, 'limit' => $limit], $events);
+    return $events;
+  }
+
+  public static function get_upcoming_events_by_group_name(string $url, int $limit, string $groupName): array {
+    $query = <<<'GRAPHQL'
+      query ($afterDatetime: DateTime, $groupName: String!, $limit: Int) {
+        group(preferredUsername: $groupName) {
+          organizedEvents(afterDatetime: $afterDatetime, limit: $limit) {
+            elements {
+              id,
+              title,
+              url,
+              beginsOn,
+              endsOn,
+              physicalAddress {
+                description,
+                locality
+              }
+            },
+            total
+          }
+        }
+      }
+      GRAPHQL;
+
+    $afterDatetime = date(\DateTime::ISO8601);
+
+    $cachedEvents = EventsCache::get(['url' => $url, 'query' => $query, 'afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit]);
+    if ($cachedEvents !== false) {
+      return $cachedEvents;
+    }
+
+    $endpoint = $url . '/api';
+    $data = self::query($endpoint, $query, ['afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit]);
+    self::checkData($data);
+
+    $events = $data['data']['group']['organizedEvents']['elements'];
+    EventsCache::set(['url' => $url, 'query' => $query, 'afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit], $events);
+    return $events;
+  }
+
+  private static function checkData($data) {
+    if (isset($data['errors'])) {
+      if (count($data['errors']) > 0 &&
+          isset($data['errors'][0]['code']) &&
+          $data['errors'][0]['code'] === 'group_not_found') {
+        throw new GroupNotFoundException(serialize($data['errors'][0]));
+      } else {
+        throw new GeneralException(serialize($data['errors']));
+      }
+    }
+  }
+}

source/includes/Settings.php

@@ -1,11 +1,6 @@
 <?php
 namespace MobilizonConnector;
 
-// Exit if this file is called directly.
-if (!defined('ABSPATH')) {
-  exit;
-}
-
 class Settings {
 
   private static $DEFAULT_OPTION_URL = 'https://mobilizon.fr';

source/includes/exceptions/GeneralException.php

@@ -0,0 +1,12 @@
+<?php
+namespace MobilizonConnector;
+
+class GeneralException extends \Exception {
+  public function __construct($message, $code = 0, Throwable $previous = null) {
+    parent::__construct($message, $code, $previous);
+  }
+
+  public function __toString() {
+    return __CLASS__ . ": [{$this->code}]: {$this->message}\n";
+}
+}

source/includes/exceptions/GroupNotFoundException.php

@@ -0,0 +1,12 @@
+<?php
+namespace MobilizonConnector;
+
+class GroupNotFoundException extends \Exception {
+  public function __construct($message, $code = 0, Throwable $previous = null) {
+    parent::__construct($message, $code, $previous);
+  }
+
+  public function __toString() {
+    return __CLASS__ . ": [{$this->code}]: {$this->message}\n";
+}
+}

source/readme.txt

@@ -17,7 +17,7 @@ License: <wordpress-license>
 Features
 - Display events as Gutenberg block, as widget and as shortcut
 - Display events' title, date, and location, if available
-- Cache requests' responses for 2 minutes in the browser's `sessionStorage`
+- Cache requests' responses for 2 minutes in the database
 - Configure number of events to show per block, per widget and per shortcut
 - Optionally filter events by a specific group per block, per widget and per shortcut
 - Set the URL of the Mobilizon instance in the settings

source/uninstall.php

@@ -1,6 +1,6 @@
 <?php
-require_once __DIR__ . '/includes/constants.php';
+require_once __DIR__ . '/includes/Constants.php';
-require_once __DIR__ . '/includes/settings.php';
+require_once __DIR__ . '/includes/Settings.php';
 
 // If uninstall.php is not called by WordPress, exit.
 if (!defined('WP_UNINSTALL_PLUGIN')) {

source/view/events-list-group-not-found.php

@@ -0,0 +1,11 @@
+<?php
+namespace MobilizonConnector;
+
+// Exit if this file is called directly.
+if (!defined('ABSPATH')) {
+  exit;
+}
+?>
+<div class="<?php echo esc_attr($classNamePrefix); ?>_events-list">
+  <?php echo esc_html(sprintf(__('The group "%s" could not be found!', 'connector-mobilizon'), $groupName)); ?>
+</div>

source/view/events-list-not-loaded.php

@@ -0,0 +1,11 @@
+<?php
+namespace MobilizonConnector;
+
+// Exit if this file is called directly.
+if (!defined('ABSPATH')) {
+  exit;
+}
+?>
+<div class="<?php echo esc_attr($classNamePrefix); ?>_events-list">
+  <?php esc_html_e('The events could not be loaded!', 'connector-mobilizon'); ?>
+</div>

source/view/events-list-widget/form.php

@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;

source/view/events-list.php

@@ -1,14 +1,23 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
 }
 ?>
-<div class="<?php echo esc_attr($classNamePrefix); ?>_events-list"
+<div class="<?php echo esc_attr($classNamePrefix); ?>_events-list">
-  data-maximum="<?php echo esc_attr($eventsCount); ?>"
+  <ul style="list-style-type: none; padding-left: 0;">
-  data-group-name="<?php echo esc_attr($groupName); ?>">
+    <?php foreach($events as $event) { ?>
-  <div class="general-error" style="display: none;"><?php esc_html_e('The events could not be loaded!', 'connector-mobilizon'); ?></div>
+    <li>
-  <div class="group-not-found" style="display: none;"><?php esc_html_e('The group could not be found!', 'connector-mobilizon'); ?></div>
+      <a href="<?php echo esc_attr($event['url']); ?>"><?php echo esc_html_e($event['title']); ?></a>
-  <div class="loading-indicator" style="display: none;"><?php esc_html_e('Loading...', 'connector-mobilizon'); ?></div>
+      <br>
-  <ul style="list-style-type: none; padding-left: 0;"></ul>
+      <?php echo esc_html_e(Formatter::format_date($locale, $timeZone, $event['beginsOn'], $event['endsOn'], $isShortOffsetNameShown)); ?>
+      <?php if (isset($event['physicalAddress'])) { ?>
+      <br>
+      <?php echo esc_html_e(Formatter::format_location($event['physicalAddress']['description'], $event['physicalAddress']['locality'])) ?>
+      <?php } ?>
+    </li>
+    <?php } ?>
+  </ul>
 </div>

source/view/settings/is-short-offset-name-shown-field.php

@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;

source/view/settings/page.php

@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;

source/view/settings/url-field.php

@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;

tests/DateTimeWrapperTest.php

@@ -0,0 +1,47 @@
+<?php
+declare(strict_types=1);
+
+use MobilizonConnector\DateTimeWrapper;
+use PHPUnit\Framework\TestCase;
+
+final class DateTimeWrapperTest extends TestCase {
+  public function testCanGet24TimeForUsualTime(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z');
+    $this->assertSame('16:45', $d->get24Time());
+  }
+
+  public function testCanGetShortDateForUsualDate(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z');
+    $this->assertSame('24/12/2020', $d->getShortDate());
+  }
+
+  public function testCanGetShortDateForUsualDateWithLocaleWithUnderscore(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z');
+    $this->assertSame('24/12/2020', $d->getShortDate(), 'en_GB');
+  }
+
+  public function testCanGetShortDateForUsualDateWithTimezoneString(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z', 'en-GB', 'Europe/Rome');
+    $this->assertSame('24/12/2020', $d->getShortDate());
+  }
+
+  public function testCanGetShortDateForUsualDateWithNamedOffset(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z', 'en-GB', 'UTC');
+    $this->assertSame('24/12/2020', $d->getShortDate());
+  }
+
+  public function testCanGetShortDateForUsualDateWithOffset(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z', 'en-GB', '+02:00');
+    $this->assertSame('24/12/2020', $d->getShortDate());
+  }
+
+  public function testCanGetShortDateForUsualDateWithEmptyTimezone(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z', 'en-GB', '');
+    $this->assertSame('24/12/2020', $d->getShortDate());
+  }
+
+  public function testCanGetShortOffsetNameForUsualTime(): void {
+    $d = new DateTimeWrapper('2020-12-24T16:45:00Z');
+    $this->assertSame('UTC', $d->getTimeZoneName());
+  }
+}

tests/FormatterTest.php

@@ -0,0 +1,52 @@
+<?php
+declare(strict_types=1);
+
+use MobilizonConnector\Formatter;
+use PHPUnit\Framework\TestCase;
+
+final class FormatterTest extends PHPUnit\Framework\TestCase
+{
+  public function testCanDateFormatOneDate(): void {
+    $this->assertSame('15/04/2021 10:30 - 15:30', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', '2021-04-15T15:30:00Z', false));
+  }
+
+  public function testCanDateFormatOneDateWithOffset(): void {
+    $this->assertSame('15/04/2021 10:30 - 15:30 (UTC)', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', '2021-04-15T15:30:00Z', true));
+  }
+
+  public function testCanDateFormatOneDateWithTimeZoneOffset(): void {
+    $this->assertSame('15/04/2021 11:30 - 16:30', Formatter::format_date('en-GB', '+01:00', '2021-04-15T10:30:00Z', '2021-04-15T15:30:00Z', false));
+  }
+
+  public function testCanDateFormatTwoDates(): void {
+    $this->assertSame('15/04/2021 10:30 - 16/04/2021 15:30', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', '2021-04-16T15:30:00Z', false));
+  }
+
+  public function testCanDateFormatTwoDatesWithOffset(): void {
+    $this->assertSame('15/04/2021 10:30 - 16/04/2021 15:30 (UTC)', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', '2021-04-16T15:30:00Z', true));
+  }
+
+  public function testCanDateFormatWhenSecondDateIsNull(): void {
+    $this->assertSame('15/04/2021 10:30', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', null, false));
+  }
+
+  public function testCanDateFormatWhenSecondDateIsNullWithOffset(): void {
+    $this->assertSame('15/04/2021 10:30 (UTC)', Formatter::format_date('en-GB', 'UTC', '2021-04-15T10:30:00Z', null, true));
+  }
+
+  public function testCanLocationFormatBothParameters(): void {
+    $this->assertSame('a, b', Formatter::format_location('a', 'b'));
+  }
+
+  public function testLocationFormatDescriptionOnly(): void {
+    $this->assertSame('a', Formatter::format_location('a', ''));
+  }
+
+  public function testLocationFormatDescriptionWithSpaceOnly(): void {
+    $this->assertSame('', Formatter::format_location(' ', ''));
+  }
+
+  public function testLocationFormatLocalityOnly(): void {
+    $this->assertSame('a', Formatter::format_location('', 'a'));
+  }
+}

webpack.config.cjs

@@ -8,7 +8,6 @@ const FOLDER_SOURCE = './source'
 module.exports = {
   entry: {
     'block-events-loader': FOLDER_SOURCE + '/front/block-events-loader.js',
-    'events-loader': FOLDER_SOURCE + '/front/events-loader.js',
   },
   output: {
     filename: '[name].js',