141 lines
3.1 KiB
JavaScript
141 lines
3.1 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 $tw: false */
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"use strict";
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/*
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Retrieve ETag if available
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*/
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var retrieveETag = function(self) {
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var headers = {
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Accept: "*/*;charset=UTF-8"
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};
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$tw.utils.httpRequest({
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url: self.uri(),
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type: "HEAD",
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headers: headers,
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callback: function(err,data,xhr) {
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if(err) {
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return;
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}
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var etag = xhr.getResponseHeader("ETag");
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if(!etag) {
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return;
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}
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self.etag = etag.replace(/^W\//,"");
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}
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});
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};
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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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retrieveETag(this);
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};
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PutSaver.prototype.uri = function() {
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return 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 = {
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"Content-Type": "text/html;charset=UTF-8"
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};
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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.notifier.display("$:/language/Notifications/Save/Starting");
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$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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var status = xhr.status,
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errorMsg = err;
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if(status === 412) { // file changed on server
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errorMsg = $tw.language.getString("Error/PutEditConflict");
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} else if(status === 401) { // authentication required
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errorMsg = $tw.language.getString("Error/PutUnauthorized");
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} else if(status === 403) { // permission denied
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errorMsg = $tw.language.getString("Error/PutForbidden");
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}
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if (xhr.responseText) {
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// treat any server response like a plain text error explanation
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errorMsg = errorMsg + "\n\n" + xhr.responseText;
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}
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callback(errorMsg); // fail
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} else {
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self.etag = xhr.getResponseHeader("ETag");
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if(self.etag == null) {
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retrieveETag(self);
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}
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callback(null); // success
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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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