Added importer for custom theme settings (#15596)

closes: https://github.com/TryGhost/Ghost/issues/15542

- custom theme settings were not reinstated on import
- importing custom theme settings for the current active theme requires the theme be re-activated

ghost/core/core/server/data/importer/importers/data/custom-theme-settings.js

@@ -0,0 +1,81 @@
+const _ = require('lodash');
+const Promise = require('bluebird');
+const debug = require('@tryghost/debug')('importer:roles');
+const BaseImporter = require('./base');
+const models = require('../../../../models');
+const {activate} = require('../../../../services/themes/activate');
+
+class CustomThemeSettingsImporter extends BaseImporter {
+    constructor(allDataFromFile) {
+        super(allDataFromFile, {
+            modelName: 'CustomThemeSetting',
+            dataKeyToImport: 'custom_theme_settings'
+        });
+    }
+
+    beforeImport() {
+        debug('beforeImport');
+        return super.beforeImport();
+    }
+
+    doImport(options, importOptions) {
+        debug('doImport', this.modelName, this.dataToImport.length);
+
+        let ops = [];
+
+        _.each(this.dataToImport, (item) => {
+            ops.push(models.CustomThemeSetting.findOne({theme: item.theme, key: item.key}, options)
+                .then((setting) => {
+                    if (_.isObject(item.value)) {
+                        item.value = JSON.stringify(item.value);
+                    }
+                    
+                    if (setting) {
+                        setting.set('value', item.value);
+                        if (setting.hasChanged()) {
+                            return setting.save(null, options)
+                                .then((importedModel) => {
+                                    if (importOptions.returnImportedData) {
+                                        this.importedDataToReturn.push(importedModel.toJSON());
+                                    }
+                                    return importedModel;
+                                })
+                                .catch((err) => {
+                                    return this.handleError(err, item);
+                                });
+                        }
+
+                        return Promise.resolve();
+                    }
+
+                    return models.CustomThemeSetting.add(item, options)
+                        .then((importedModel) => {
+                            if (importOptions.returnImportedData) {
+                                this.importedDataToReturn.push(importedModel.toJSON());
+                            }
+                            return importedModel;
+                        })
+                        .catch((err) => {
+                            return this.handleError(err, item);
+                        });
+                })
+                .reflect());
+        });
+        
+        const opsPromise = Promise.all(ops);
+
+        // activate function is called to refresh cache when importing custom theme settings for active theme
+        opsPromise.then(() => {
+            models.Settings.findOne({key: 'active_theme'})
+                .then((theme) => {
+                    const currentTheme = theme.get('value');
+                    if (this.dataToImport.some(themeSetting => themeSetting.theme === currentTheme)) {
+                        activate(currentTheme);
+                    }
+                });
+        });
+
+        return opsPromise;
+    }
+}
+module.exports = CustomThemeSettingsImporter;

ghost/core/core/server/data/importer/importers/data/data-importer.js

@@ -13,6 +13,7 @@ const NewslettersImporter = require('./newsletters');
 const ProductsImporter = require('./products');
 const StripeProductsImporter = require('./stripe-products');
 const StripePricesImporter = require('./stripe-prices');
+const CustomThemeSettingsImporter = require('./custom-theme-settings');
 const RolesImporter = require('./roles');
 let importers = {};
 let DataImporter;
@@ -35,6 +36,7 @@ DataImporter = {
         importers.stripe_products = new StripeProductsImporter(importData.data);
         importers.stripe_prices = new StripePricesImporter(importData.data);
         importers.posts = new PostsImporter(importData.data);
+        importers.custom_theme_settings = new CustomThemeSettingsImporter(importData.data);
 
         return importData;
     },