Added boolean as allowed custom theme setting type

refs https://github.com/TryGhost/Team/issues/1106

- updated schema validation to add `'boolean'` as an allowed `type` value
- added `format()` and `parse()` methods to `CustomThemeSetting` model to match `Settings` model behaviour for boolean-type settings

core/server/data/schema/schema.js

@@ -678,7 +678,8 @@ module.exports = {
             nullable: false,
             validations: {
                 isIn: [[
-                    'select'
+                    'select',
+                    'boolean'
                 ]]
             }
         },

core/server/models/custom-theme-setting.js

@@ -1,7 +1,48 @@
+const _ = require('lodash');
 const ghostBookshelf = require('./base');
 
 const CustomThemeSetting = ghostBookshelf.Model.extend({
-    tableName: 'custom_theme_settings'
+    tableName: 'custom_theme_settings',
+
+    parse() {
+        const attrs = ghostBookshelf.Model.prototype.parse.apply(this, arguments);
+        const settingType = attrs.type;
+
+        // transform "0" to false for boolean type
+        if (settingType === 'boolean' && (attrs.value === '0' || attrs.value === '1')) {
+            attrs.value = !!+attrs.value;
+        }
+
+        // transform "false" to false for boolean type
+        if (settingType === 'boolean' && (attrs.value === 'false' || attrs.value === 'true')) {
+            attrs.value = JSON.parse(attrs.value);
+        }
+
+        return attrs;
+    },
+
+    format() {
+        const attrs = ghostBookshelf.Model.prototype.format.apply(this, arguments);
+        const settingType = attrs.type;
+
+        if (settingType === 'boolean') {
+            // CASE: Ensure we won't forward strings, otherwise model events or model interactions can fail
+            if (attrs.value === '0' || attrs.value === '1') {
+                attrs.value = !!+attrs.value;
+            }
+
+            // CASE: Ensure we won't forward strings, otherwise model events or model interactions can fail
+            if (attrs.value === 'false' || attrs.value === 'true') {
+                attrs.value = JSON.parse(attrs.value);
+            }
+
+            if (_.isBoolean(attrs.value)) {
+                attrs.value = attrs.value.toString();
+            }
+        }
+
+        return attrs;
+    }
 });
 
 module.exports = {

test/unit/server/models/custom-theme-setting.test.js

@@ -0,0 +1,53 @@
+const should = require('should');
+const models = require('../../../../core/server/models');
+
+describe('Unit: models/custom-theme-setting', function () {
+    before(function () {
+        models.init();
+    });
+
+    describe('parse', function () {
+        it('ensure correct parsing when fetching from db', function () {
+            const setting = models.CustomThemeSetting.forge();
+
+            let returns = setting.parse({theme: 'test', key: 'dark_mode', value: 'false', type: 'boolean'});
+            should.equal(returns.value, false);
+
+            returns = setting.parse({theme: 'test', key: 'dark_mode', value: false, type: 'boolean'});
+            should.equal(returns.value, false);
+
+            returns = setting.parse({theme: 'test', key: 'dark_mode', value: true, type: 'boolean'});
+            should.equal(returns.value, true);
+
+            returns = setting.parse({theme: 'test', key: 'dark_mode', value: 'true', type: 'boolean'});
+            should.equal(returns.value, true);
+
+            returns = setting.parse({theme: 'test', key: 'dark_mode', value: '0', type: 'boolean'});
+            should.equal(returns.value, false);
+
+            returns = setting.parse({theme: 'test', key: 'dark_mode', value: '1', type: 'boolean'});
+            should.equal(returns.value, true);
+
+            returns = setting.parse({theme: 'test', key: 'something', value: 'null', type: 'select'});
+            should.equal(returns.value, 'null');
+        });
+    });
+
+    describe('format', function () {
+        it('ensure correct formatting when setting', function () {
+            const setting = models.CustomThemeSetting.forge();
+
+            let returns = setting.format({theme: 'test', key: 'dark_mode', value: '0', type: 'boolean'});
+            should.equal(returns.value, 'false');
+
+            returns = setting.format({theme: 'test', key: 'dark_mode', value: '1', type: 'boolean'});
+            should.equal(returns.value, 'true');
+
+            returns = setting.format({theme: 'test', key: 'dark_mode', value: 'false', type: 'boolean'});
+            should.equal(returns.value, 'false');
+
+            returns = setting.format({theme: 'test', key: 'dark_mode', value: 'true', type: 'boolean'});
+            should.equal(returns.value, 'true');
+        });
+    });
+});