Fix error with revision check during saving.

[redakcja.git] / src / redakcja / static / js / wiki / wikiapi.js

diff --git a/src/redakcja/static/js/wiki/wikiapi.js b/src/redakcja/static/js/wiki/wikiapi.js
index 4e3cd2c..73642ac 100644 (file)
--- a/src/redakcja/static/js/wiki/wikiapi.js
+++ b/src/redakcja/static/js/wiki/wikiapi.js
@@ -1,437 +1,557 @@
 (function($) {
 (function($) {

-       $.wikiapi = {};
-       var noop = function() {
-       };
-       var noops = {
-               success: noop,
-               failure: noop
-       };
-       /*
-        * Return absolute reverse path of given named view. (at least he have it
-        * hard-coded in one place)
-        *
-        * TODO: think of a way, not to hard-code it here ;)
-        *
-        */
-       function reverse() {
-               var vname = arguments[0];
-               var base_path = "/editor";
-
-               if (vname == "ajax_document_text") {
-                       var path = "/text/" + arguments[1] + '/';
-
-               if (arguments[2] !== undefined)
-                               path += arguments[2] + '/';
-
-                       return base_path + path;
-               }
+    $.wikiapi = {};
+    var noop = function() {
+    };
+    var noops = {
+       success: noop,
+       failure: noop
+    };
+    /*
+     * Return absolute reverse path of given named view. (at least he have it
+     * hard-coded in one place)
+     *
+     * TODO: think of a way, not to hard-code it here ;)
+     *
+     */
+    function reverse() {
+       var vname = arguments[0];
+       var base_path = "/editor";
+
+       if (vname == "ajax_document_text") {
+           var path = "/text/" + arguments[1] + '/';
+
+           if (arguments[2] !== undefined)
+               path += arguments[2] + '/';
+
+           return base_path + path;
+       }

 
         if (vname == "ajax_document_revert") {
             return base_path + "/revert/" + arguments[1] + '/';
         }
 
 
 
         if (vname == "ajax_document_revert") {
             return base_path + "/revert/" + arguments[1] + '/';
         }
 
 

-               if (vname == "ajax_document_history") {
-
-                       return base_path + "/history/" + arguments[1] + '/';
-               }
-
-               if (vname == "ajax_document_gallery") {
+       if (vname == "ajax_document_history") {
+           return base_path + "/history/" + arguments[1] + '/';
+       }

 
 

-                       return base_path + "/gallery/" + arguments[1] + '/';
-               }
+       if (vname == "ajax_document_scans") {
+            return base_path + "/scans/" + arguments[1] + '/';
+       }
+       if (vname == "ajax_document_gallery") {
+           return base_path + "/gallery/" + arguments[1] + '/';
+       }

 
 

-               if (vname == "ajax_document_diff")
-                       return base_path + "/diff/" + arguments[1] + '/';
+       if (vname == "ajax_document_diff")
+           return base_path + "/diff/" + arguments[1] + '/';

 
         if (vname == "ajax_document_rev")
             return base_path + "/rev/" + arguments[1] + '/';
 
 
         if (vname == "ajax_document_rev")
             return base_path + "/rev/" + arguments[1] + '/';
 

-               if (vname == "ajax_document_pubmark")
-                       return base_path + "/pubmark/" + arguments[1] + '/';
-
-               if (vname == "ajax_cover_preview")
-                       return "/cover/preview/";
-
-               console.log("Couldn't reverse match:", vname);
-               return "/404.html";
-       };
-
-       /*
-        * Document Abstraction
-        */
-       function WikiDocument(element_id) {
-               var meta = $('#' + element_id);
-               this.id = meta.attr('data-chunk-id');
-
-               this.revision = $("*[data-key='revision']", meta).text();
-               this.readonly = !!$("*[data-key='readonly']", meta).text();
-
-               this.galleryLink = $("*[data-key='gallery']", meta).text();
-        this.galleryStart = parseInt($("*[data-key='gallery-start']", meta).text());
-
-        var diff = $("*[data-key='diff']", meta).text();
-        if (diff) {
-            diff = diff.split(',');
-            if (diff.length == 2 && diff[0] < diff[1])
-                this.diff = diff;
-            else if (diff.length == 1) {
-                diff = parseInt(diff);
-                if (diff != NaN)
-                    this.diff = [diff - 1, diff];
-            }
-        }
+       if (vname == "ajax_document_pubmark")
+           return base_path + "/pubmark/" + arguments[1] + '/';

 
 

-               this.galleryImages = [];
-               this.text = null;
-               this.has_local_changes = false;
-               this._lock = -1;
-               this._context_lock = -1;
-               this._lock_count = 0;
-       };
-
-       WikiDocument.prototype.triggerDocumentChanged = function() {
-               $(document).trigger('wlapi_document_changed', this);
-       };
-       /*
-        * Fetch text of this document.
-        */
-       WikiDocument.prototype.fetch = function(params) {
-               params = $.extend({}, noops, params);
-               var self = this;
-               $.ajax({
-                       method: "GET",
-                       url: reverse("ajax_document_text", self.id),
-                       data: {"revision": self.revision},
-                       dataType: 'json',
-                       success: function(data) {
-                               var changed = false;
-
-                               if (self.text === null || self.revision !== data.revision) {
-                                       self.text = data.text;
-                                       self.revision = data.revision;
-                                       self.gallery = data.gallery;
-                                       changed = true;
-                                       self.triggerDocumentChanged();
-                               };
-
-                               self.has_local_changes = false;
-                               params['success'](self, changed);
-                       },
-                       error: function() {
-                               params['failure'](self, "Nie udało się wczytać treści dokumentu.");
-                       }
-               });
-       };
-       /*
-        * Fetch history of this document.
-        *
-        * from - First revision to fetch (default = 0) upto - Last revision to
-        * fetch (default = tip)
-        *
-        */
-       WikiDocument.prototype.fetchHistory = function(params) {
-               /* this doesn't modify anything, so no locks */
-               params = $.extend({}, noops, params);
-               var self = this;
-               $.ajax({
-                       method: "GET",
-                       url: reverse("ajax_document_history", self.id),
-                       dataType: 'json',
-                       data: {
-                               "from": params['from'],
-                               "upto": params['upto']
-                       },
-                       success: function(data) {
-                               params['success'](self, data);
-                       },
-                       error: function() {
-                               params['failure'](self, "Nie udało się wczytać historii dokumentu.");
-                       }
-               });
-       };
-       WikiDocument.prototype.fetchDiff = function(params) {
-               /* this doesn't modify anything, so no locks */
-               var self = this;
-               params = $.extend({
-                       'from': self.revision,
-                       'to': self.revision
-               }, noops, params);
-               $.ajax({
-                       method: "GET",
-                       url: reverse("ajax_document_diff", self.id),
-                       dataType: 'html',
-                       data: {
-                               "from": params['from'],
-                               "to": params['to']
-                       },
-                       success: function(data) {
-                               params['success'](self, data);
-                       },
-                       error: function() {
-                               params['failure'](self, "Nie udało się wczytać porównania wersji.");
-                       }
-               });
-       };
-
-    WikiDocument.prototype.checkRevision = function(params) {
-        /* this doesn't modify anything, so no locks */
-        var self = this;
-        $.ajax({
-            method: "GET",
-            url: reverse("ajax_document_rev", self.id),
-            dataType: 'text',
-            success: function(data) {
-                if (data == '') {
-                    if (params.error)
-                        params.error();
-                }
-                else if (data != self.revision)
-                    params.outdated();
-            }
-        });
+       if (vname == "ajax_cover_preview")
+           return "/cover/preview/";
+
+       console.log("Couldn't reverse match:", vname);
+       return "/404.html";

     };
     };

+    class Api {
+        static csrf = $('input[name="csrfmiddlewaretoken"]').val();
+
+        // TODO: Add waiting marker, error reporting.
+        static post(url, data) {
+            data['csrfmiddlewaretoken'] = this.csrf;
+            $.ajax({
+                url: url,
+                type: "POST",
+                data: data
+            });
+        }

 
 

-       /*
-        * Fetch gallery
-        */
-       WikiDocument.prototype.refreshGallery = function(params) {
-               params = $.extend({}, noops, params);
-               var self = this;
-               if (!self.galleryLink) {
-                       params['failure'](self, 'Brak galerii.');
-                       return;
-               }
-               $.ajax({
-                       method: "GET",
-                       url: reverse("ajax_document_gallery", self.galleryLink),
-                       dataType: 'json',
-                       // data: {},
-                       success: function(data) {
-                               self.galleryImages = data;
-                               params['success'](self, data);
-                       },
-                       error: function(xhr) {
-                switch (xhr.status) {
-                    case 403:
-                        var msg = 'Galerie dostępne tylko dla zalogowanych użytkowników.';
-                        break;
-                    case 404:
-                        var msg = "Nie znaleziono galerii o nazwie: '" + self.galleryLink + "'.";
-                    default:
-                        var msg = "Nie udało się wczytać galerii o nazwie: '" + self.galleryLink + "'.";
-                }
-                               self.galleryImages = [];
-                               params['failure'](self, msg);
-                       }
-               });
-       };
+        static get(url, callback) {
+            $.ajax({
+                url: url,
+                type: "GET",
+                success: function(data) {
+                    callback(data);
+                },
+            });
+        }
+
+        static setGallery(id, gallery) {
+            this.post(
+                '/editor/set-gallery/' + id + '/',
+                {gallery: gallery}
+            )
+        }
+        static setGalleryStart(id, start) {
+            this.post(
+                '/editor/set-gallery-start/' + id + '/',
+                {start: start}
+            )
+        }
+
+        static openGalleryEdit(bookSlug) {
+            window.open(
+                '/documents/book/' + bookSlug + '/gallery/',
+                '_blank'
+            ).focus();
+        }
+
+        static withGalleryList(callback) {
+            this.get(
+                '/editor/galleries/',
+                callback
+            );
+        }
+    }

 
     /*
 
     /*

-     * Set document's text
+     * Document Abstraction

      */
      */

-    WikiDocument.prototype.setText = function(text, setter) {
-        if (text == this.text) return;
-        
-        this.text = text;
-        this.has_local_changes = true;
+    class WikiDocument {
+        constructor(element_id) {
+           var meta = $('#' + element_id);
+           this.id = meta.attr('data-chunk-id');
+
+           this.revision = $("*[data-key='revision']", meta).text();
+           this.readonly = !!$("*[data-key='readonly']", meta).text();
+
+           this.bookSlug = $("*[data-key='book-slug']", meta).text();
+           this.scansLink = $("*[data-key='scans']", meta).text();
+           this.galleryLink = $("*[data-key='gallery']", meta).text();
+            this.galleryStart = parseInt($("*[data-key='gallery-start']", meta).text());
+            this.fullUri = $("*[data-key='full-uri']", meta).text();
+
+           this.text = null;
+            this.saving = false;
+           this.has_local_changes = false;
+            this.active = new Date();
+           this._lock = -1;
+           this._context_lock = -1;
+           this._lock_count = 0;
+        };
+
+        triggerDocumentChanged() {
+           $(document).trigger('wlapi_document_changed', this);
+        }

 
 

-    };
+        /*
+         * Fetch text of this document.
+         */
+        fetch(params) {
+           params = $.extend({}, noops, params);
+           var self = this;
+           $.ajax({
+               method: "GET",
+               url: reverse("ajax_document_text", self.id),
+               data: {"revision": self.revision},
+               dataType: 'json',
+               success: function(data) {
+                   var changed = false;
+
+                   if (self.text === null || self.revision !== data.revision) {
+                       self.text = data.text;
+                        $.wiki.undo.push(data.text);
+                       self.revision = data.revision;
+                       self.gallery = data.gallery;
+                       changed = true;
+                       self.triggerDocumentChanged();
+                   };
+
+                   self.has_local_changes = false;
+                   params['success'](self, changed);
+               },
+               error: function() {
+                   params['failure'](self, "Nie udało się wczytać treści dokumentu.");
+               }
+           });
+        }

 
 

-    
-       /*
-        * Save text back to the server
-        */
-       WikiDocument.prototype.save = function(params) {
-               params = $.extend({}, noops, params);
-               var self = this;
-
-               if (!self.has_local_changes) {
-                       console.log("Abort: no changes.");
-                       return params['success'](self, false, "Nie ma zmian do zapisania.");
-               };
-
-               // Serialize form to dictionary
-               var data = {};
-               $.each(params['form'].serializeArray(), function() {
-                       data[this.name] = this.value;
-               });
-
-               data['textsave-text'] = self.text;
-
-               $.ajax({
-                       url: reverse("ajax_document_text", self.id),
-                       type: "POST",
-                       dataType: "json",
-                       data: data,
-                       success: function(data) {
-                               var changed = false;
-
-                $('#header').removeClass('saving');
-
-                               if (data.text) {
-                                       self.text = data.text;
-                                       self.revision = data.revision;
-                                       self.gallery = data.gallery;
-                                       changed = true;
-                                       self.triggerDocumentChanged();
-                               };
-
-                               params['success'](self, changed, ((changed && "Udało się zapisać :)") || "Twoja wersja i serwera jest identyczna"));
-                       },
-                       error: function(xhr) {
-                if ($('#header').hasClass('saving')) {
-                    $('#header').removeClass('saving');
-                    $.blockUI({
-                        message: "<p>Nie udało się zapisać zmian. <br/><button onclick='$.unblockUI()'>OK</button></p>"
-                    })
-                }
-                else {
-                    try {
-                        params['failure'](self, $.parseJSON(xhr.responseText));
+        /*
+         * Fetch history of this document.
+         */
+        fetchHistory(params) {
+           /* this doesn't modify anything, so no locks */
+           params = $.extend({}, noops, params);
+           var self = this;
+           $.ajax({
+               method: "GET",
+               url: reverse("ajax_document_history", self.id) + "?before=" + params.before,
+               dataType: 'json',
+               success: function(data) {
+                   params['success'](self, data);
+               },
+               error: function() {
+                   params['failure'](self, "Nie udało się wczytać historii dokumentu.");
+               }
+           });
+        }
+
+        fetchDiff(params) {
+           /* this doesn't modify anything, so no locks */
+           var self = this;
+           params = $.extend({
+               'from': self.revision,
+               'to': self.revision
+           }, noops, params);
+           $.ajax({
+               method: "GET",
+               url: reverse("ajax_document_diff", self.id),
+               dataType: 'html',
+               data: {
+                   "from": params['from'],
+                   "to": params['to']
+               },
+               success: function(data) {
+                   params['success'](self, data);
+               },
+               error: function() {
+                   params['failure'](self, "Nie udało się wczytać porównania wersji.");
+               }
+           });
+        }
+
+        checkRevision(params) {
+            /* this doesn't modify anything, so no locks */
+            var self = this;
+            let active = new Date() - self.active < 30 * 1000;
+            let saving = self.saving;
+            $.ajax({
+                method: "GET",
+                url: reverse("ajax_document_rev", self.id),
+                data: {
+                    'a': active,
+                    'new': 1,
+                },
+                dataType: 'json',
+                success: function(data) {
+                    if (data == '') {
+                        if (params.error)
+                            params.error();

                     }
                     }

-                    catch (e) {
-                        params['failure'](self, {
-                            "__message": "<p>Nie udało się zapisać - błąd serwera.</p>"
+                    else {
+                        let people = $('<div>');
+                        data.people.forEach((p) => {
+                            let item = $('<img>');
+                            item.attr('src', p.gravatar),
+                            item.attr(
+                                'title',
+                                p.name  + ' (' +
+                                    (p.active ? 'akt.' : 'nieakt.') +
+                                    ' od ' + p.since + ')')
+                            if (p.active) {
+                                item.addClass('active');
+                            }
+                            people.append(item);

                         });
                         });

-                    };
+                        $("#people").html(people);
+
+                        if (!saving && (data.rev != self.revision)) {
+                            params.outdated();
+                        }
+                   }

                 }
                 }

+            });
+        }
+
+        refreshImageGallery(params) {
+            if (this.galleryLink) {
+                params = $.extend({}, params, {
+                    url: reverse("ajax_document_gallery", this.galleryLink)
+                });
+            }
+            this.refreshGallery(params);
+        }

 
 

-                       }
-               });
+        refreshScansGallery(params) {
+            if (this.scansLink) {
+                params = $.extend({}, params, {
+                    url: reverse("ajax_document_scans", this.scansLink)
+                });
+                this.refreshGallery(params);
+            } else {
+                // Fallback to image gallery.
+                this.refreshImageGallery(params)
+            }
+        }
+        
+        /*
+         * Fetch gallery
+         */
+        refreshGallery(params) {
+           params = $.extend({}, noops, params);
+           var self = this;
+            if (!params.url) {
+               params.failure('Brak galerii.');
+               return;
+            }
+           $.ajax({
+               method: "GET",
+               url: params.url,
+               dataType: 'json',
+               success: function(data) {
+                   params.success(data);
+               },
+               error: function(xhr) {
+                    switch (xhr.status) {
+                    case 403:
+                        var msg = 'Galerie dostępne tylko dla zalogowanych użytkowników.';
+                        break;
+                    case 404:
+                        var msg = "Nie znaleziono galerii.";
+                    default:
+                        var msg = "Nie udało się wczytać galerii.";
+                    }
+                   params.failure(msg);
+               }
+           });
+        }

 
 

-        $('#save-hide').click(function(){
-            $('#header').addClass('saving');
-            $.unblockUI();
-            $.wiki.blocking.unblock();
-        });
-       }; /* end of save() */
+        setGallery(gallery) {
+            this.galleryLink = gallery;
+            Api.setGallery(this.id, gallery);
+        }

 
 

-    WikiDocument.prototype.revertToVersion = function(params) {
-        var self = this;
-        params = $.extend({}, noops, params);
+        setGalleryStart(start) {
+            this.galleryStart = start;
+            Api.setGalleryStart(this.id, start);
+        }

 
 

-        if (params.revision >= this.revision) {
-            params.failure(self, 'Proszę wybrać rewizję starszą niż aktualna.');
-            return;
+        openGalleryEdit(start) {
+            Api.openGalleryEdit(this.bookSlug);

         }
 
         }
 

-        // Serialize form to dictionary
-        var data = {};
-        $.each(params['form'].serializeArray(), function() {
-            data[this.name] = this.value;
-        });
-
-        $.ajax({
-            url: reverse("ajax_document_revert", self.id),
-            type: "POST",
-            dataType: "json",
-            data: data,
-            success: function(data) {
-                if (data.text) {
-                    self.text = data.text;
-                    self.revision = data.revision;
-                    self.gallery = data.gallery;
-                    self.triggerDocumentChanged();
-
-                    params.success(self, "Udało się przywrócić wersję :)");
-                }
-                else {
-                    params.failure(self, "Przywracana wersja identyczna z aktualną. Anulowano przywracanie.");
-                }
-            },
-            error: function(xhr) {
-                params.failure(self, "Nie udało się przywrócić wersji - błąd serwera.");
+        withGalleryList(callback) {
+            Api.withGalleryList(callback);
+        }
+        
+        /*
+         * Set document's text
+         */
+        setText(text, silent=false) {
+            if (text == this.text) return;
+            if (!silent) {
+                $.wiki.undo.push(text);

             }
             }

-        });
-    };
+            this.text = text;
+            this.has_local_changes = true;
+        }

 
 

-       WikiDocument.prototype.pubmark = function(params) {
-               params = $.extend({}, noops, params);
-               var self = this;
-               var data = {
-                       "pubmark-id": self.id,
-               };
-
-               /* unpack form */
-               $.each(params.form.serializeArray(), function() {
-                       data[this.name] = this.value;
-               });
-
-               $.ajax({
-                       url: reverse("ajax_document_pubmark", self.id),
-                       type: "POST",
-                       dataType: "json",
-                       data: data,
-                       success: function(data) {
-                               params.success(self, data.message);
-                       },
-                       error: function(xhr) {
-                               if (xhr.status == 403 || xhr.status == 401) {
-                                       params.failure(self, {
-                                               "__all__": ["Nie masz uprawnień lub nie jesteś zalogowany."]
-                                       });
-                               }
-                               else {
-                                       try {
-                                               params.failure(self, $.parseJSON(xhr.responseText));
-                                       }
-                                       catch (e) {
-                                               params.failure(self, {
-                                                       "__all__": ["Nie udało się - błąd serwera."]
-                                               });
-                                       };
-                               };
-                       }
-               });
-       };
-
-       WikiDocument.prototype.refreshCover = function(params) {
-        var self = this;
-               var data = {
-                       xml: self.text // TODO: send just DC
-               };
-        $.ajax({
-            url: reverse("ajax_cover_preview"),
-            type: "POST",
-            data: data,
-            success: function(data) {
-                params.success(data);
-            },
-            error: function(xhr) {
-                // params.failure("Nie udało się odświeżyć okładki - błąd serwera.");
+        undo() {
+            let ctx = $.wiki.exitContext();
+            this.setText(
+                $.wiki.undo.undo(),
+                true
+            );
+            $.wiki.enterContext(ctx);
+        }
+        redo() {
+            let ctx = $.wiki.exitContext();
+            this.setText(
+                $.wiki.undo.redo(),
+                true
+            );
+            $.wiki.enterContext(ctx);
+        }
+
+        /*
+         * Save text back to the server
+         */
+        save(params) {
+           params = $.extend({}, noops, params);
+           var self = this;
+
+           if (!self.has_local_changes) {
+               console.log("Abort: no changes.");
+               return params['success'](self, false, "Nie ma zmian do zapisania.");
+           };
+
+           // Serialize form to dictionary
+           var data = {};
+           $.each(params['form'].serializeArray(), function() {
+               data[this.name] = this.value;
+           });
+
+           data['textsave-text'] = self.text;
+
+            self.saving = true;
+           $.ajax({
+               url: reverse("ajax_document_text", self.id),
+               type: "POST",
+               dataType: "json",
+               data: data,
+               success: function(data) {
+                   var changed = false;
+
+                    $('#header').removeClass('saving');
+
+                   if (data.text) {
+                       self.text = data.text;
+                       self.revision = data.revision;
+                       self.gallery = data.gallery;
+                       changed = true;
+                       self.triggerDocumentChanged();
+                   };
+                    self.saving = false;
+
+                   params['success'](self, changed, ((changed && "Udało się zapisać :)") || "Twoja wersja i serwera jest identyczna"));
+               },
+               error: function(xhr) {
+                    self.saving = false;
+                    if ($('#header').hasClass('saving')) {
+                        $('#header').removeClass('saving');
+                        $.blockUI({
+                            message: "<p>Nie udało się zapisać zmian. <br/><button onclick='$.unblockUI()'>OK</button></p>"
+                        })
+                    }
+                    else {
+                        try {
+                            params['failure'](self, $.parseJSON(xhr.responseText));
+                        }
+                        catch (e) {
+                            params['failure'](self, {
+                                "__message": "<p>Nie udało się zapisać - błąd serwera.</p>"
+                            });
+                        };
+                    }
+               }
+           });
+
+            $('#save-hide').click(function(){
+                $('#header').addClass('saving');
+                $.unblockUI();
+                $.wiki.blocking.unblock();
+            });
+        } /* end of save() */
+
+        revertToVersion(params) {
+            var self = this;
+            params = $.extend({}, noops, params);
+
+            if (params.revision >= this.revision) {
+                params.failure(self, 'Proszę wybrać rewizję starszą niż aktualna.');
+                return;

             }
             }

-        });
-       };

 
 

+            // Serialize form to dictionary
+            var data = {};
+            $.each(params['form'].serializeArray(), function() {
+                data[this.name] = this.value;
+            });
+
+            $.ajax({
+                url: reverse("ajax_document_revert", self.id),
+                type: "POST",
+                dataType: "json",
+                data: data,
+                success: function(data) {
+                    if (data.text) {
+                        self.text = data.text;
+                        self.revision = data.revision;
+                        self.gallery = data.gallery;
+                        self.triggerDocumentChanged();
+
+                        params.success(self, "Udało się przywrócić wersję :)");
+                    }
+                    else {
+                        params.failure(self, "Przywracana wersja identyczna z aktualną. Anulowano przywracanie.");
+                    }
+                },
+                error: function(xhr) {
+                    params.failure(self, "Nie udało się przywrócić wersji - błąd serwera.");
+                }
+            });
+        }

 
 

-    WikiDocument.prototype.getLength = function(params) {
-        params = $.extend({}, noops, params);
-        var xml = this.text.replace(/\/(\s+)/g, '<br />$1');
-        var parser = new DOMParser();
-        var doc = parser.parseFromString(xml, 'text/xml');
-        var error = $('parsererror', doc);
+        pubmark(params) {
+           params = $.extend({}, noops, params);
+           var self = this;
+           var data = {
+               "pubmark-id": self.id,
+           };
+
+           /* unpack form */
+           $.each(params.form.serializeArray(), function() {
+               data[this.name] = this.value;
+           });
+
+           $.ajax({
+               url: reverse("ajax_document_pubmark", self.id),
+               type: "POST",
+               dataType: "json",
+               data: data,
+               success: function(data) {
+                   params.success(self, data.message);
+               },
+               error: function(xhr) {
+                   if (xhr.status == 403 || xhr.status == 401) {
+                       params.failure(self, {
+                           "__all__": ["Nie masz uprawnień lub nie jesteś zalogowany."]
+                       });
+                   }
+                   else {
+                       try {
+                           params.failure(self, $.parseJSON(xhr.responseText));
+                       }
+                       catch (e) {
+                           params.failure(self, {
+                               "__all__": ["Nie udało się - błąd serwera."]
+                           });
+                       };
+                   };
+               }
+           });
+        }

 
 

-        if (error.length > 0) {
-            throw "Not an XML document.";
+        refreshCover(params) {
+            var self = this;
+           var data = {
+               xml: self.text // TODO: send just DC
+           };
+            $.ajax({
+                url: reverse("ajax_cover_preview"),
+                type: "POST",
+                data: data,
+                success: function(data) {
+                    params.success(data);
+                },
+                error: function(xhr) {
+                    // params.failure("Nie udało się odświeżyć okładki - błąd serwera.");
+                }
+            });

         }
         }

-        $.xmlns["rdf"] = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; 
-        $('rdf|RDF', doc).remove();
-        if (params.noFootnotes) {
-            $('pa, pe, pr, pt', doc).remove();
+
+        getLength(params) {
+            params = $.extend({}, noops, params);
+            var xml = this.text.replace(/\/(\s+)/g, '<br />$1');
+            var parser = new DOMParser();
+            var doc = parser.parseFromString(xml, 'text/xml');
+            var error = $('parsererror', doc);
+
+            if (error.length > 0) {
+                throw "Not an XML document.";
+            }
+            $.xmlns["rdf"] = "http://www.w3.org/1999/02/22-rdf-syntax-ns#";
+            $('rdf|RDF', doc).remove();
+            if (params.noFootnotes) {
+                $('pa, pe, pr, pt', doc).remove();
+            }
+           if (params.noThemes) {
+               $('motyw', doc).remove();
+            }
+            var text = $(doc).text();
+            text = $.trim(text.replace(/\s{2,}/g, ' '));
+            return text.length;

         }
         }

-       if (params.noThemes) {
-           $('motyw', doc).remove();
+
+        /* Temporary workaround for relative images. */
+        getBase() {
+            return '/media/dynamic/images/' + this.galleryLink + '/';

         }
         }

-        var text = $(doc).text();
-        text = $.trim(text.replace(/\s{2,}/g, ' '));
-        return text.length;

     }
 
     }
 

-    /* Temporary workaround for relative images. */
-    WikiDocument.prototype.getBase = function() {
-        return '/media/dynamic/images/' + this.galleryLink + '/';
-    };
-
-       $.wikiapi.WikiDocument = WikiDocument;
+    $.wikiapi.WikiDocument = WikiDocument;

 })(jQuery);
 })(jQuery);