Add utils to install plugins

1 files changed, 70 insertions, 0 deletions

diff --git a/lib/plugins/validateConfig.js b/lib/plugins/validateConfig.js
new file mode 100644
index 0000000..fc32344
--- /dev/null
+++ b/lib/plugins/validateConfig.js
@@ -0,0 +1,70 @@
+var jsonschema = require('jsonschema');
+var jsonSchemaDefaults = require('json-schema-defaults');
+var mergeDefaults = require('merge-defaults');
+
+var Promise = require('../utils/promise');
+var error = require('../utils/error');
+
+/**
+    Validate one plugin for a book and update book's confiration
+
+    @param {Book}
+    @param {Plugin}
+    @return {Book}
+*/
+function validatePluginConfig(book, plugin) {
+    var config = book.getConfig();
+    var packageInfos = plugin.getPackage();
+
+    var configKey = [
+        'pluginsConfig',
+        plugin.getName()
+    ].join('.');
+
+    var pluginConfig = config.getValue(configKey, {});
+
+    var schema = packageInfos.gitbook || {};
+    if (!schema) return book;
+
+    // Normalize schema
+    schema.id = '/' + configKey;
+    schema.type = 'object';
+
+    // Validate and throw if invalid
+    var v = new jsonschema.Validator();
+    var result = v.validate(config, schema, {
+        propertyName: configKey
+    });
+
+    // Throw error
+    if (result.errors.length > 0) {
+        throw new error.ConfigurationError(new Error(result.errors[0].stack));
+    }
+
+    // Insert default values
+    var defaults = jsonSchemaDefaults(schema);
+    pluginConfig = mergeDefaults(config, defaults);
+
+
+    // Update configuration
+    config = config.setValue(configKey, pluginConfig);
+
+    // Return new book
+    return book.set('config', config);
+}
+
+/**
+    Validate a book configuration for plugins and
+    returns an update configuration with default values.
+
+    @param {Book}
+    @param {OrderedMap<String:Plugin>}
+    @return {Promise<Book>}
+*/
+function validateConfig(book, plugins) {
+    return Promise.reduce(plugins, function(newBook, plugin) {
+        return validatePluginConfig(newBook, plugin);
+    }, book);
+}
+
+module.exports = validateConfig;