var util = require('../util'); var Shape = require('../model/shape'); function DomXmlParser() { } DomXmlParser.prototype.parse = function(xml, shape) { if (xml.replace(/^\s+/, '') === '') return {}; var result, error; try { if (window.DOMParser) { try { var parser = new DOMParser(); result = parser.parseFromString(xml, 'text/xml'); } catch (syntaxError) { throw util.error(new Error('Parse error in document'), { originalError: syntaxError, code: 'XMLParserError', retryable: true }); } if (result.documentElement === null) { throw util.error(new Error('Cannot parse empty document.'), { code: 'XMLParserError', retryable: true }); } var isError = result.getElementsByTagName('parsererror')[0]; if (isError && (isError.parentNode === result || isError.parentNode.nodeName === 'body' || isError.parentNode.parentNode === result || isError.parentNode.parentNode.nodeName === 'body')) { var errorElement = isError.getElementsByTagName('div')[0] || isError; throw util.error(new Error(errorElement.textContent || 'Parser error in document'), { code: 'XMLParserError', retryable: true }); } } else if (window.ActiveXObject) { result = new window.ActiveXObject('Microsoft.XMLDOM'); result.async = false; if (!result.loadXML(xml)) { throw util.error(new Error('Parse error in document'), { code: 'XMLParserError', retryable: true }); } } else { throw new Error('Cannot load XML parser'); } } catch (e) { error = e; } if (result && result.documentElement && !error) { var data = parseXml(result.documentElement, shape); var metadata = getElementByTagName(result.documentElement, 'ResponseMetadata'); if (metadata) { data.ResponseMetadata = parseXml(metadata, {}); } return data; } else if (error) { throw util.error(error || new Error(), {code: 'XMLParserError', retryable: true}); } else { // empty xml document return {}; } }; function getElementByTagName(xml, tag) { var elements = xml.getElementsByTagName(tag); for (var i = 0, iLen = elements.length; i < iLen; i++) { if (elements[i].parentNode === xml) { return elements[i]; } } } function parseXml(xml, shape) { if (!shape) shape = {}; switch (shape.type) { case 'structure': return parseStructure(xml, shape); case 'map': return parseMap(xml, shape); case 'list': return parseList(xml, shape); case undefined: case null: return parseUnknown(xml); default: return parseScalar(xml, shape); } } function parseStructure(xml, shape) { var data = {}; if (xml === null) return data; util.each(shape.members, function(memberName, memberShape) { if (memberShape.isXmlAttribute) { if (Object.prototype.hasOwnProperty.call(xml.attributes, memberShape.name)) { var value = xml.attributes[memberShape.name].value; data[memberName] = parseXml({textContent: value}, memberShape); } } else { var xmlChild = memberShape.flattened ? xml : getElementByTagName(xml, memberShape.name); if (xmlChild) { data[memberName] = parseXml(xmlChild, memberShape); } else if (!memberShape.flattened && memberShape.type === 'list') { data[memberName] = memberShape.defaultValue; } } }); return data; } function parseMap(xml, shape) { var data = {}; var xmlKey = shape.key.name || 'key'; var xmlValue = shape.value.name || 'value'; var tagName = shape.flattened ? shape.name : 'entry'; var child = xml.firstElementChild; while (child) { if (child.nodeName === tagName) { var key = getElementByTagName(child, xmlKey).textContent; var value = getElementByTagName(child, xmlValue); data[key] = parseXml(value, shape.value); } child = child.nextElementSibling; } return data; } function parseList(xml, shape) { var data = []; var tagName = shape.flattened ? shape.name : (shape.member.name || 'member'); var child = xml.firstElementChild; while (child) { if (child.nodeName === tagName) { data.push(parseXml(child, shape.member)); } child = child.nextElementSibling; } return data; } function parseScalar(xml, shape) { if (xml.getAttribute) { var encoding = xml.getAttribute('encoding'); if (encoding === 'base64') { shape = new Shape.create({type: encoding}); } } var text = xml.textContent; if (text === '') text = null; if (typeof shape.toType === 'function') { return shape.toType(text); } else { return text; } } function parseUnknown(xml) { if (xml === undefined || xml === null) return ''; // empty object if (!xml.firstElementChild) { if (xml.parentNode.parentNode === null) return {}; if (xml.childNodes.length === 0) return ''; else return xml.textContent; } // object, parse as structure var shape = {type: 'structure', members: {}}; var child = xml.firstElementChild; while (child) { var tag = child.nodeName; if (Object.prototype.hasOwnProperty.call(shape.members, tag)) { // multiple tags of the same name makes it a list shape.members[tag].type = 'list'; } else { shape.members[tag] = {name: tag}; } child = child.nextElementSibling; } return parseStructure(xml, shape); } /** * @api private */ module.exports = DomXmlParser;