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/*
* Copyright (c) 2015
*
* This file is licensed under the Affero General Public License version 3
* or later.
*
* See the COPYING-README file.
*
*/
/**
* Webdav transport for Backbone.
*
* This makes it possible to use Webdav endpoints when
* working with Backbone models and collections.
*
* Requires the davclient.js library.
*
* Usage example:
*
* var PersonModel = OC.Backbone.Model.extend({
* // make it use the DAV transport
* sync: OC.Backbone.davSync,
*
* // DAV properties mapping
* davProperties: {
* 'id': '{http://example.com/ns}id',
* 'firstName': '{http://example.com/ns}first-name',
* 'lastName': '{http://example.com/ns}last-name',
* 'age': '{http://example.com/ns}age'
* },
*
* // additional parsing, if needed
* parse: function(props) {
* // additional parsing (DAV property values are always strings)
* props.age = parseInt(props.age, 10);
* return props;
* }
* });
*
* var PersonCollection = OC.Backbone.Collection.extend({
* // make it use the DAV transport
* sync: OC.Backbone.davSync,
*
* // use person model
* // note that davProperties will be inherited
* model: PersonModel,
*
* // DAV collection URL
* url: function() {
* return OC.linkToRemote('dav') + '/person/';
* },
* });
*/
/* global dav */
(function(Backbone) {
var methodMap = {
'create': 'POST',
'update': 'PROPPATCH',
'patch': 'PROPPATCH',
'delete': 'DELETE',
'read': 'PROPFIND'
};
// Throw an error when a URL is needed, and none is supplied.
function urlError() {
throw new Error('A "url" property or function must be specified');
}
/**
* Convert a single propfind result to JSON
*
* @param {Object} result
* @param {Object} davProperties properties mapping
*/
function parsePropFindResult(result, davProperties) {
if (_.isArray(result)) {
return _.map(result, function(subResult) {
return parsePropFindResult(subResult, davProperties);
});
}
var props = {
href: result.href
};
_.each(result.propStat, function(propStat) {
if (propStat.status !== 'HTTP/1.1 200 OK') {
return;
}
for (var key in propStat.properties) {
var propKey = key;
if (key in davProperties) {
propKey = davProperties[key];
}
props[propKey] = propStat.properties[key];
}
});
if (!props.id) {
// parse id from href
props.id = parseIdFromLocation(props.href);
}
return props;
}
/**
* Parse ID from location
*
* @param {string} url url
* @return {string} id
*/
function parseIdFromLocation(url) {
var queryPos = url.indexOf('?');
if (queryPos > 0) {
url = url.substr(0, queryPos);
}
var parts = url.split('/');
var result;
do {
result = parts[parts.length - 1];
parts.pop();
// note: first result can be empty when there is a trailing slash,
// so we take the part before that
} while (!result && parts.length > 0);
return result;
}
function isSuccessStatus(status) {
return status >= 200 && status <= 299;
}
function convertModelAttributesToDavProperties(attrs, davProperties) {
var props = {};
var key;
for (key in attrs) {
var changedProp = davProperties[key];
var value = attrs[key];
if (!changedProp) {
console.warn('No matching DAV property for property "' + key);
changedProp = key;
}
if (_.isBoolean(value) || _.isNumber(value)) {
// convert to string
value = '' + value;
}
props[changedProp] = value;
}
return props;
}
function callPropFind(client, options, model, headers) {
return client.propFind(
options.url,
_.values(options.davProperties) || [],
options.depth,
headers
).then(function(response) {
if (isSuccessStatus(response.status)) {
if (_.isFunction(options.success)) {
var propsMapping = _.invert(options.davProperties);
var results = parsePropFindResult(response.body, propsMapping);
if (options.depth > 0) {
// discard root entry
results.shift();
}
options.success(results);
return;
}
} else if (_.isFunction(options.error)) {
options.error(response);
}
});
}
function callPropPatch(client, options, model, headers) {
return client.propPatch(
options.url,
convertModelAttributesToDavProperties(model.changed, options.davProperties),
headers
).then(function(result) {
if (isSuccessStatus(result.status)) {
if (_.isFunction(options.success)) {
// pass the object's own values because the server
// does not return the updated model
options.success(model.toJSON());
}
} else if (_.isFunction(options.error)) {
options.error(result);
}
});
}
function callMkCol(client, options, model, headers) {
// call MKCOL without data, followed by PROPPATCH
return client.request(
options.type,
options.url,
headers,
null
).then(function(result) {
if (!isSuccessStatus(result.status)) {
if (_.isFunction(options.error)) {
options.error(result);
}
return;
}
callPropPatch(client, options, model, headers);
});
}
function callMethod(client, options, model, headers) {
headers['Content-Type'] = 'application/json';
return client.request(
options.type,
options.url,
headers,
options.data
).then(function(result) {
if (!isSuccessStatus(result.status)) {
if (_.isFunction(options.error)) {
options.error(result);
}
return;
}
if (_.isFunction(options.success)) {
if (options.type === 'PUT' || options.type === 'POST' || options.type === 'MKCOL') {
// pass the object's own values because the server
// does not return anything
var responseJson = result.body || model.toJSON();
var locationHeader = result.xhr.getResponseHeader('Content-Location');
if (options.type === 'POST' && locationHeader) {
responseJson.id = parseIdFromLocation(locationHeader);
}
options.success(responseJson);
return;
}
// if multi-status, parse
if (result.status === 207) {
var propsMapping = _.invert(options.davProperties);
options.success(parsePropFindResult(result.body, propsMapping));
} else {
options.success(result.body);
}
}
});
}
function davCall(options, model) {
var client = new dav.Client({
baseUrl: options.url,
xmlNamespaces: _.extend({
'DAV:': 'd',
'http://owncloud.org/ns': 'oc'
}, options.xmlNamespaces || {})
});
client.resolveUrl = function() {
return options.url;
};
var headers = _.extend({
'X-Requested-With': 'XMLHttpRequest',
'requesttoken': OC.requestToken
}, options.headers);
if (options.type === 'PROPFIND') {
return callPropFind(client, options, model, headers);
} else if (options.type === 'PROPPATCH') {
return callPropPatch(client, options, model, headers);
} else if (options.type === 'MKCOL') {
return callMkCol(client, options, model, headers);
} else {
return callMethod(client, options, model, headers);
}
}
/**
* DAV transport
*/
function davSync(method, model, options) {
var params = {type: methodMap[method] || method};
var isCollection = (model instanceof Backbone.Collection);
if (method === 'update') {
// if a model has an inner collection, it must define an
// attribute "hasInnerCollection" that evaluates to true
if (model.hasInnerCollection) {
// if the model itself is a Webdav collection, use MKCOL
params.type = 'MKCOL';
} else if (model.usePUT || (model.collection && model.collection.usePUT)) {
// use PUT instead of PROPPATCH
params.type = 'PUT';
}
}
// Ensure that we have a URL.
if (!options.url) {
params.url = _.result(model, 'url') || urlError();
}
// Ensure that we have the appropriate request data.
if (options.data == null && model && (method === 'create' || method === 'update' || method === 'patch')) {
params.data = JSON.stringify(options.attrs || model.toJSON(options));
}
// Don't process data on a non-GET request.
if (params.type !== 'PROPFIND') {
params.processData = false;
}
if (params.type === 'PROPFIND' || params.type === 'PROPPATCH') {
var davProperties = model.davProperties;
if (!davProperties && model.model) {
// use dav properties from model in case of collection
davProperties = model.model.prototype.davProperties;
}
if (davProperties) {
if (_.isFunction(davProperties)) {
params.davProperties = davProperties.call(model);
} else {
params.davProperties = davProperties;
}
}
params.davProperties = _.extend(params.davProperties || {}, options.davProperties);
if (_.isUndefined(options.depth)) {
if (isCollection) {
options.depth = 1;
} else {
options.depth = 0;
}
}
}
// Pass along `textStatus` and `errorThrown` from jQuery.
var error = options.error;
options.error = function(xhr, textStatus, errorThrown) {
options.textStatus = textStatus;
options.errorThrown = errorThrown;
if (error) {
error.call(options.context, xhr, textStatus, errorThrown);
}
};
// Make the request, allowing the user to override any Ajax options.
var xhr = options.xhr = Backbone.davCall(_.extend(params, options), model);
model.trigger('request', model, xhr, options);
return xhr;
}
// exports
Backbone.davCall = davCall;
Backbone.davSync = davSync;
})(OC.Backbone);