mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-07-03 10:43:16 +00:00
91b341e8e0
Without these checks we get a startup crash when using TiddlyWiki in client-server configuration.
111 lines
2.5 KiB
JavaScript
111 lines
2.5 KiB
JavaScript
/*\
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title: $:/core/modules/savers/put.js
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type: application/javascript
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module-type: saver
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Saves wiki by performing a PUT request to the server
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Works with any server which accepts a PUT request
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to the current URL, such as a WebDAV server.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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Select the appropriate saver module and set it up
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*/
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var PutSaver = function(wiki) {
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this.wiki = wiki;
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var self = this;
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var uri = this.uri();
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// Async server probe. Until probe finishes, save will fail fast
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// See also https://github.com/Jermolene/TiddlyWiki5/issues/2276
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$tw.utils.httpRequest({
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url: uri,
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type: "OPTIONS",
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callback: function(err, data, xhr) {
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// Check DAV header http://www.webdav.org/specs/rfc2518.html#rfc.section.9.1
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if(!err) {
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self.serverAcceptsPuts = xhr.status === 200 && !!xhr.getResponseHeader("dav");
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}
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}
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});
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// Retrieve ETag if available
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$tw.utils.httpRequest({
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url: uri,
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type: "HEAD",
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callback: function(err, data, xhr) {
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if(!err) {
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self.etag = xhr.getResponseHeader("ETag");
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}
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}
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});
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};
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PutSaver.prototype.uri = function() {
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return encodeURI(document.location.toString().split("#")[0]);
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};
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// TODO: in case of edit conflict
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// Prompt: Do you want to save over this? Y/N
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// Merging would be ideal, and may be possible using future generic merge flow
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PutSaver.prototype.save = function(text, method, callback) {
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if(!this.serverAcceptsPuts) {
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return false;
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}
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var self = this;
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var headers = { "Content-Type": "text/html;charset=UTF-8" };
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if(this.etag) {
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headers["If-Match"] = this.etag;
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}
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$tw.utils.httpRequest({
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url: this.uri(),
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type: "PUT",
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headers: headers,
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data: text,
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callback: function(err, data, xhr) {
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if(err) {
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callback(err);
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} if(xhr.status === 200 || xhr.status === 201) {
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self.etag = xhr.getResponseHeader("ETag");
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callback(null); // success
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} else if(xhr.status === 412) { // edit conflict
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var message = $tw.language.getString("Error/EditConflict");
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callback(message);
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} else {
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callback(xhr.responseText); // fail
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}
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}
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});
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return true;
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};
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/*
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Information about this saver
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*/
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PutSaver.prototype.info = {
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name: "put",
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priority: 2000,
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capabilities: ["save", "autosave"]
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};
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/*
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Static method that returns true if this saver is capable of working
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*/
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exports.canSave = function(wiki) {
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return /^https?:/.test(location.protocol);
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};
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/*
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Create an instance of this saver
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*/
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exports.create = function(wiki) {
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return new PutSaver(wiki);
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};
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})();
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