589 lines
16 KiB
JavaScript
589 lines
16 KiB
JavaScript
// Copyright IBM Corp. 2012,2016. All Rights Reserved.
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// Node module: loopback-datasource-juggler
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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exports.safeRequire = safeRequire;
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exports.fieldsToArray = fieldsToArray;
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exports.selectFields = selectFields;
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exports.removeUndefined = removeUndefined;
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exports.parseSettings = parseSettings;
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exports.mergeSettings = exports.deepMerge = mergeSettings;
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exports.isPlainObject = isPlainObject;
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exports.defineCachedRelations = defineCachedRelations;
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exports.sortObjectsByIds = sortObjectsByIds;
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exports.setScopeValuesFromWhere = setScopeValuesFromWhere;
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exports.mergeQuery = mergeQuery;
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exports.mergeIncludes = mergeIncludes;
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exports.createPromiseCallback = createPromiseCallback;
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exports.uniq = uniq;
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exports.toRegExp = toRegExp;
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exports.hasRegExpFlags = hasRegExpFlags;
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exports.idEquals = idEquals;
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exports.findIndexOf = findIndexOf;
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var g = require('strong-globalize')();
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var traverse = require('traverse');
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var assert = require('assert');
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var Promise = require('bluebird');
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function safeRequire(module) {
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try {
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return require(module);
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} catch (e) {
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g.log('Run "{{npm install loopback-datasource-juggler}} %s" command ',
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'to use {{loopback-datasource-juggler}} using %s database engine',
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module, module);
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process.exit(1);
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}
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}
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/*
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* Extracting fixed property values for the scope from the where clause into
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* the data object
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*
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* @param {Object} The data object
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* @param {Object} The where clause
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*/
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function setScopeValuesFromWhere(data, where, targetModel) {
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for (var i in where) {
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if (i === 'and') {
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// Find fixed property values from each subclauses
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for (var w = 0, n = where[i].length; w < n; w++) {
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setScopeValuesFromWhere(data, where[i][w], targetModel);
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}
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continue;
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}
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var prop = targetModel.definition.properties[i];
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if (prop) {
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var val = where[i];
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if (typeof val !== 'object' || val instanceof prop.type ||
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prop.type.name === 'ObjectID') { // MongoDB key
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// Only pick the {propertyName: propertyValue}
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data[i] = where[i];
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}
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}
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}
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}
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/**
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* Merge include options of default scope with runtime include option.
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* exhibits the _.extend behaviour. Property value of source overrides
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* property value of destination if property name collision occurs
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* @param {String|Array|Object} destination The default value of `include` option
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* @param {String|Array|Object} source The runtime value of `include` option
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* @returns {Object}
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*/
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function mergeIncludes(destination, source) {
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var destArray = convertToArray(destination);
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var sourceArray = convertToArray(source);
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if (destArray.length === 0) {
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return sourceArray;
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}
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if (sourceArray.length === 0) {
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return destArray;
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}
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var relationNames = [];
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var resultArray = [];
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for (var j in sourceArray) {
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var sourceEntry = sourceArray[j];
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var sourceEntryRelationName = (typeof (sourceEntry.rel || sourceEntry.relation) === 'string') ?
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sourceEntry.relation : Object.keys(sourceEntry)[0];
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relationNames.push(sourceEntryRelationName);
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resultArray.push(sourceEntry);
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}
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for (var i in destArray) {
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var destEntry = destArray[i];
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var destEntryRelationName = (typeof (destEntry.rel || destEntry.relation) === 'string') ?
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destEntry.relation : Object.keys(destEntry)[0];
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if (relationNames.indexOf(destEntryRelationName) === -1) {
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resultArray.push(destEntry);
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}
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}
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return resultArray;
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}
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/**
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* Converts input parameter into array of objects which wraps the value.
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* "someValue" is converted to [{"someValue":true}]
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* ["someValue"] is converted to [{"someValue":true}]
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* {"someValue":true} is converted to [{"someValue":true}]
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* @param {String|Array|Object} param - Input parameter to be converted
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* @returns {Array}
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*/
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function convertToArray(include) {
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if (typeof include === 'string') {
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var obj = {};
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obj[include] = true;
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return [obj];
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} else if (isPlainObject(include)) {
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//if include is of the form - {relation:'',scope:''}
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if (include.rel || include.relation) {
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return [include];
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}
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// Build an array of key/value pairs
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var newInclude = [];
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for (var key in include) {
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var obj = {};
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obj[key] = include[key];
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newInclude.push(obj);
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}
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return newInclude;
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} else if (Array.isArray(include)) {
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var normalized = [];
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for (var i in include) {
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var includeEntry = include[i];
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if (typeof includeEntry === 'string') {
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var obj = {};
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obj[includeEntry] = true;
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normalized.push(obj);
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} else {
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normalized.push(includeEntry);
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}
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}
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return normalized;
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}
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return [];
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}
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/*!
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* Merge query parameters
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* @param {Object} base The base object to contain the merged results
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* @param {Object} update The object containing updates to be merged
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* @param {Object} spec Optionally specifies parameters to exclude (set to false)
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* @returns {*|Object} The base object
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* @private
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*/
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function mergeQuery(base, update, spec) {
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if (!update) {
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return;
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}
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spec = spec || {};
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base = base || {};
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if (update.where && Object.keys(update.where).length > 0) {
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if (base.where && Object.keys(base.where).length > 0) {
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base.where = { and: [base.where, update.where] };
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} else {
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base.where = update.where;
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}
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}
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// Merge inclusion
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if (spec.include !== false && update.include) {
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if (!base.include) {
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base.include = update.include;
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} else {
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if (spec.nestedInclude === true) {
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//specify nestedInclude=true to force nesting of inclusions on scoped
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//queries. e.g. In physician.patients.getAsync({include: 'address'}),
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//inclusion should be on patient model, not on physician model.
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var saved = base.include;
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base.include = {};
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base.include[update.include] = saved;
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} else {
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//default behaviour of inclusion merge - merge inclusions at the same
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//level. - https://github.com/strongloop/loopback-datasource-juggler/pull/569#issuecomment-95310874
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base.include = mergeIncludes(base.include, update.include);
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}
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}
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}
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if (spec.collect !== false && update.collect) {
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base.collect = update.collect;
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}
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// Overwrite fields
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if (spec.fields !== false && update.fields !== undefined) {
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base.fields = update.fields;
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} else if (update.fields !== undefined) {
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base.fields = [].concat(base.fields).concat(update.fields);
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}
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// set order
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if ((!base.order || spec.order === false) && update.order) {
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base.order = update.order;
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}
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// overwrite pagination
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if (spec.limit !== false && update.limit !== undefined) {
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base.limit = update.limit;
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}
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var skip = spec.skip !== false && spec.offset !== false;
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if (skip && update.skip !== undefined) {
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base.skip = update.skip;
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}
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if (skip && update.offset !== undefined) {
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base.offset = update.offset;
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}
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return base;
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}
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/**
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* Normalize fields to an array of included properties
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* @param {String|String[]|Object} fields Fields filter
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* @param {String[]} properties Property names
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* @param {Boolean} excludeUnknown To exclude fields that are unknown properties
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* @returns {String[]} An array of included property names
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*/
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function fieldsToArray(fields, properties, excludeUnknown) {
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if (!fields) return;
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// include all properties by default
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var result = properties;
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var i, n;
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if (typeof fields === 'string') {
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result = [fields];
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} else if (Array.isArray(fields) && fields.length > 0) {
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// No empty array, including all the fields
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result = fields;
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} else if ('object' === typeof fields) {
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// { field1: boolean, field2: boolean ... }
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var included = [];
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var excluded = [];
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var keys = Object.keys(fields);
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if (!keys.length) return;
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for (i = 0, n = keys.length; i < n; i++) {
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var k = keys[i];
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if (fields[k]) {
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included.push(k);
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} else if ((k in fields) && !fields[k]) {
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excluded.push(k);
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}
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}
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if (included.length > 0) {
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result = included;
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} else if (excluded.length > 0) {
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for (i = 0, n = excluded.length; i < n; i++) {
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var index = result.indexOf(excluded[i]);
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result.splice(index, 1);
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}
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}
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}
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var fieldArray = [];
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if (excludeUnknown) {
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for (i = 0, n = result.length; i < n; i++) {
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if (properties.indexOf(result[i]) !== -1) {
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fieldArray.push(result[i]);
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}
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}
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} else {
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fieldArray = result;
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}
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return fieldArray;
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}
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function selectFields(fields) {
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// map function
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return function(obj) {
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var result = {};
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var key;
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for (var i = 0; i < fields.length; i++) {
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key = fields[i];
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result[key] = obj[key];
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}
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return result;
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};
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}
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/**
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* Remove undefined values from the queury object
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* @param query
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* @param handleUndefined {String} either "nullify", "throw" or "ignore" (default: "ignore")
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* @returns {exports.map|*}
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*/
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function removeUndefined(query, handleUndefined) {
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if (typeof query !== 'object' || query === null) {
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return query;
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}
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// WARNING: [rfeng] Use map() will cause mongodb to produce invalid BSON
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// as traverse doesn't transform the ObjectId correctly
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return traverse(query).forEach(function(x) {
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if (x === undefined) {
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switch (handleUndefined) {
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case 'nullify':
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this.update(null);
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break;
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case 'throw':
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throw new Error(g.f('Unexpected `undefined` in query'));
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break;
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case 'ignore':
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default:
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this.remove();
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}
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}
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if (!Array.isArray(x) && (typeof x === 'object' && x !== null &&
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x.constructor !== Object)) {
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// This object is not a plain object
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this.update(x, true); // Stop navigating into this object
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return x;
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}
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return x;
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});
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}
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var url = require('url');
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var qs = require('qs');
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/**
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* Parse a URL into a settings object
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* @param {String} urlStr The URL for connector settings
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* @returns {Object} The settings object
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*/
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function parseSettings(urlStr) {
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if (!urlStr) {
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return {};
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}
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var uri = url.parse(urlStr, false);
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var settings = {};
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settings.connector = uri.protocol && uri.protocol.split(':')[0]; // Remove the trailing :
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settings.host = settings.hostname = uri.hostname;
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settings.port = uri.port && Number(uri.port); // port is a string
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settings.user = settings.username = uri.auth && uri.auth.split(':')[0]; // <username>:<password>
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settings.password = uri.auth && uri.auth.split(':')[1];
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settings.database = uri.pathname && uri.pathname.split('/')[1]; // remove the leading /
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settings.url = urlStr;
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if (uri.query) {
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var params = qs.parse(uri.query);
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for (var p in params) {
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settings[p] = params[p];
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}
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}
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return settings;
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}
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/**
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* Merge model settings
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*
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* Folked from https://github.com/nrf110/deepmerge/blob/master/index.js
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*
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* The original function tries to merge array items if they are objects
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*
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* @param {Object} target The target settings object
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* @param {Object} src The source settings object
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* @returns {Object} The merged settings object
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*/
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function mergeSettings(target, src) {
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var array = Array.isArray(src);
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var dst = array && [] || {};
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if (array) {
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target = target || [];
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// Add items from target into dst
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dst = dst.concat(target);
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// Add non-existent items from source into dst
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src.forEach(function(e) {
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if (dst.indexOf(e) === -1) {
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dst.push(e);
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}
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});
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} else {
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if (target != null && typeof target === 'object') {
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// Add properties from target to dst
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Object.keys(target).forEach(function(key) {
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dst[key] = target[key];
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});
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}
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if (src != null && typeof src === 'object') {
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// Source is an object
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Object.keys(src).forEach(function(key) {
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var srcValue = src[key];
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if (srcValue == null || typeof srcValue !== 'object') {
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// The source item value is null, undefined or not an object
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dst[key] = srcValue;
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} else {
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// The source item value is an object
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if (target == null || typeof target !== 'object' ||
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target[key] == null) {
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// If target is not an object or target item value
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dst[key] = srcValue;
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} else {
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dst[key] = mergeSettings(target[key], src[key]);
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}
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}
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});
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}
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}
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return dst;
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}
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/**
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* Define an non-enumerable __cachedRelations property
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* @param {Object} obj The obj to receive the __cachedRelations
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*/
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function defineCachedRelations(obj) {
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if (!obj.__cachedRelations) {
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Object.defineProperty(obj, '__cachedRelations', {
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writable: true,
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enumerable: false,
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configurable: true,
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value: {},
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});
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}
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}
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/**
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* Check if the argument is plain object
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* @param {*) obj The obj value
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* @returns {boolean}
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*/
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function isPlainObject(obj) {
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return (typeof obj === 'object') && (obj !== null) &&
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(obj.constructor === Object);
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}
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function sortObjectsByIds(idName, ids, objects, strict) {
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ids = ids.map(function(id) {
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return (typeof id === 'object') ? String(id) : id;
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});
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var indexOf = function(x) {
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var isObj = (typeof x[idName] === 'object'); // ObjectID
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var id = isObj ? String(x[idName]) : x[idName];
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return ids.indexOf(id);
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};
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var heading = [];
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var tailing = [];
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objects.forEach(function(x) {
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if (typeof x === 'object') {
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var idx = indexOf(x);
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if (strict && idx === -1) return;
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idx === -1 ? tailing.push(x) : heading.push(x);
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}
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});
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heading.sort(function(x, y) {
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var a = indexOf(x);
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var b = indexOf(y);
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if (a === -1 || b === -1) return 1; // last
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if (a === b) return 0;
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if (a > b) return 1;
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if (a < b) return -1;
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});
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return heading.concat(tailing);
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};
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function createPromiseCallback() {
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var cb;
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var promise = new Promise(function(resolve, reject) {
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cb = function(err, data) {
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if (err) return reject(err);
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return resolve(data);
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};
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});
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cb.promise = promise;
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return cb;
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}
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/**
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* Dedupe an array
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* @param {Array} an array
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* @returns {Array} an array with unique items
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*/
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function uniq(a) {
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var uniqArray = [];
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if (!a) {
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return uniqArray;
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}
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assert(Array.isArray(a), 'array argument is required');
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for (var i = 0, n = a.length; i < n; i++) {
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if (a.indexOf(a[i]) === i) {
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uniqArray.push(a[i]);
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}
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}
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return uniqArray;
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}
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/**
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* Converts a string, regex literal, or a RegExp object to a RegExp object.
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* @param {String|Object} The string, regex literal, or RegExp object to convert
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* @returns {Object} A RegExp object
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*/
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function toRegExp(regex) {
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var isString = typeof regex === 'string';
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var isRegExp = regex instanceof RegExp;
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if (!(isString || isRegExp))
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return new Error(g.f('Invalid argument, must be a string, {{regex}} literal, or ' +
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'{{RegExp}} object'));
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if (isRegExp)
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return regex;
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if (!hasRegExpFlags(regex))
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return new RegExp(regex);
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// only accept i, g, or m as valid regex flags
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var flags = regex.split('/').pop().split('');
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var validFlags = ['i', 'g', 'm'];
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var invalidFlags = [];
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flags.forEach(function(flag) {
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if (validFlags.indexOf(flag) === -1)
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invalidFlags.push(flag);
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});
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var hasInvalidFlags = invalidFlags.length > 0;
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if (hasInvalidFlags)
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return new Error(g.f('Invalid {{regex}} flags: %s', invalidFlags));
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// strip regex delimiter forward slashes
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var expression = regex.substr(1, regex.lastIndexOf('/') - 1);
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return new RegExp(expression, flags.join(''));
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}
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|
|
function hasRegExpFlags(regex) {
|
|
return regex instanceof RegExp ?
|
|
regex.toString().split('/').pop() :
|
|
!!regex.match(/.*\/.+$/);
|
|
}
|
|
|
|
// Compare two id values to decide if updateAttributes is trying to change
|
|
// the id value for a given instance
|
|
function idEquals(id1, id2) {
|
|
if (id1 === id2) {
|
|
return true;
|
|
}
|
|
// Allows number/string conversions
|
|
if ((typeof id1 === 'number' && typeof id2 === 'string') ||
|
|
(typeof id1 === 'string' && typeof id2 === 'number')) {
|
|
return id1 == id2;
|
|
}
|
|
// For complex id types such as MongoDB ObjectID
|
|
id1 = JSON.stringify(id1);
|
|
id2 = JSON.stringify(id2);
|
|
if (id1 === id2) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// Defaults to native Array.prototype.indexOf when no idEqual is present
|
|
// Otherwise, returns the lowest index for which isEqual(arr[]index, target) is true
|
|
function findIndexOf(arr, target, isEqual) {
|
|
if (!isEqual) {
|
|
return arr.indexOf(target);
|
|
}
|
|
|
|
for (var i = 0; i < arr.length; i++) {
|
|
if (isEqual(arr[i], target)) { return i; }
|
|
};
|
|
|
|
return -1;
|
|
}
|