FinanceBuddy: per-board opt-in gate on Integrations page (v0.3) new files Helper Template

Helper/FinanceHelper.php

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+<?php
+
+namespace Kanboard\Plugin\FinanceBuddy\Helper;
+
+use Kanboard\Core\Base;
+
+/**
+ * Template/controller helper for FinanceBuddy.
+ *
+ * FinanceBuddy is opt-in per board: every render and save point is gated on isEnabled(), so an
+ * un-enabled board is untouched. The flag lives in project metadata (key financebuddy_enabled),
+ * written by the checkbox on the project's Integrations page.
+ */
+class FinanceHelper extends Base
+{
+    const ENABLED_KEY = 'financebuddy_enabled';
+
+    /**
+     * Is FinanceBuddy enabled for this board?
+     *
+     * @param  integer $project_id
+     * @return bool
+     */
+    public function isEnabled($project_id)
+    {
+        return (int) $this->projectMetadataModel->get($project_id, self::ENABLED_KEY, 0) === 1;
+    }
+}

Template/project/integration.php

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+<h3><i class="fa fa-money fa-fw" aria-hidden="true"></i> <?= t('FinanceBuddy') ?></h3>
+<div class="listing">
+    <?php /* Hidden 0 before the checkbox so unchecking posts a value (a bare unchecked box posts
+             nothing, which would leave a stale 1). The checkbox's 1 wins when checked. The shared
+             Integrations form saves this straight into project metadata. */ ?>
+    <input type="hidden" name="<?= \Kanboard\Plugin\FinanceBuddy\Helper\FinanceHelper::ENABLED_KEY ?>" value="0">
+    <?= $this->form->checkbox(
+        \Kanboard\Plugin\FinanceBuddy\Helper\FinanceHelper::ENABLED_KEY,
+        t('Enable FinanceBuddy on this board'),
+        1,
+        isset($values['financebuddy_enabled']) && $values['financebuddy_enabled'] == 1
+    ) ?>
+    <p class="form-help">
+        <?= t('When enabled, cards on this board can carry a money value (debit or credit, with optional installments), shown on the card and totalled per column. Boards left disabled are unaffected.') ?>
+    </p>
+</div>
+
+<div class="form-actions">
+    <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
+</div>