Bug 1635503: Add JSON editor for SmartEvidence

This adds a visual JSON editor for SmartEvidence
frameworks allowing site administrators to create
such frameworks more easily by copying and pasting
rather than needing to know the JSON file syntax.

behatnotneeded

Change-Id: Ief74375a6c5d23ab05e12f08d07dd3209e89c948

htdocs/js/jsoneditor/LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2013 Jeremy Dorn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

htdocs/js/jsoneditor/README.Mahara

+JSONeditor in Mahara
+=================
+
+Website: https://github.com/json-editor/json-editor/
+Version: 1.3
+
+This library is used by SmartEvidence, to provide a user-friendly way
+of editing a framework, without relying on a json upload.
+
+In order to work, the JSONeditor needs a dist folder with jsoneditor.js and
+jsoneditor.js.map in it.
+It's not in the github repo for some reason, but can be found here:
+https://www.jsdelivr.com/package/npm/@json-editor/json-editor?path=dist&version=1.3.0
+
+Changes:
+
+Removed .github, tests and docs folders; Gruntfile.js, package.json,
+package-lock.json, .gitattributes, .gitignore, npmignore, .npmrc and travis.yml
+
+From src/iconlibs, removed bootstrap2.js, foundation2-3.js, materialicons.js
+src/styles
+src/templates  - all but default
+src/themes bootstrap2.js, foundation.js, materialize.js
+
+To allow changing of the text on the Edit JSON button:
+    in src/defaults.js, added:
+        /**
+        * Title on Edit JSON buttons
+        */
+        button_edit : "Edit raw"
+
+    in src/dist/jsoneditor.js
+        replaced this.editjson_button = this.getButton('JSON','edit','Edit JSON');
+        with this.editjson_button = this.getButton('','edit', this.translate('button_edit'));
+
+        added  button_edit: "Edit raw", to the JSONEditor.defualts.languages.en JSON
+
+To stop the editor displaying undefined in the Standard Elements header when the parent
+id is undefined:
+    in src/dist/jsoneditor.js - added the asterisked line to the following:
+          // The compiled function
+          return function(vars) {
+            var ret = template+"";
+            var r;
+            for(i=0; i<l; i++) {
+              r = replacements[i];
+              ret = ret.replace(r.s, r.r(vars));
+            }
+ *          ret = ret.replace(/undefined\./gi, '');
+            return ret;
+
+Because Mahara requires just an initial capital letter on titles, added the asterisked
+lines to the JSONEditor.defaults.translate function:
+
+     if(variables) {
+        for(var i=0; i<variables.length; i++) {
+          string = string.replace(new RegExp('\\{\\{'+i+'}}','g'),variables[i]);
+ *         string = string.toLowerCase();
+ *        string = string.charAt(0).toUpperCase() + string.slice(1);
+        }
+      }

htdocs/js/jsoneditor/src/class.js

+/*jshint loopfunc: true */
+/* Simple JavaScript Inheritance
+ * By John Resig http://ejohn.org/
+ * MIT Licensed.
+ */
+// Inspired by base2 and Prototype
+var Class;
+(function(){
+  var initializing = false, fnTest = /xyz/.test(function(){window.postMessage("xyz");}) ? /\b_super\b/ : /.*/;
+
+  // The base Class implementation (does nothing)
+  Class = function(){};
+
+  // Create a new Class that inherits from this class
+  Class.extend = function extend(prop) {
+    var _super = this.prototype;
+
+    // Instantiate a base class (but only create the instance,
+    // don't run the init constructor)
+    initializing = true;
+    var prototype = new this();
+    initializing = false;
+
+    // Copy the properties over onto the new prototype
+    for (var name in prop) {
+      // Check if we're overwriting an existing function
+      prototype[name] = typeof prop[name] == "function" &&
+        typeof _super[name] == "function" && fnTest.test(prop[name]) ?
+        (function(name, fn){
+          return function() {
+            var tmp = this._super;
+
+            // Add a new ._super() method that is the same method
+            // but on the super-class
+            this._super = _super[name];
+
+            // The method only need to be bound temporarily, so we
+            // remove it when we're done executing
+            var ret = fn.apply(this, arguments);
+            this._super = tmp;
+
+            return ret;
+          };
+        })(name, prop[name]) :
+        prop[name];
+    }
+
+    // The dummy class constructor
+    function Class() {
+      // All construction is actually done in the init method
+      if ( !initializing && this.init )
+        this.init.apply(this, arguments);
+    }
+
+    // Populate our constructed prototype object
+    Class.prototype = prototype;
+
+    // Enforce the constructor to be what we expect
+    Class.prototype.constructor = Class;
+
+    // And make this class extendable
+    Class.extend = extend;
+
+    return Class;
+  };
+
+  return Class;
+})();

htdocs/js/jsoneditor/src/core.js

+var JSONEditor = function(element,options) {
+  if (!(element instanceof Element)) {
+    throw new Error('element should be an instance of Element');
+  }
+  options = $extend({},JSONEditor.defaults.options,options||{});
+  this.element = element;
+  this.options = options;
+  this.init();
+};
+JSONEditor.prototype = {
+  // necessary since we remove the ctor property by doing a literal assignment. Without this
+  // the $isplainobject function will think that this is a plain object.
+  constructor: JSONEditor,
+  init: function() {
+    var self = this;
+
+    this.ready = false;
+    this.copyClipboard = null;
+
+    var theme_class = JSONEditor.defaults.themes[this.options.theme || JSONEditor.defaults.theme];
+    if(!theme_class) throw "Unknown theme " + (this.options.theme || JSONEditor.defaults.theme);
+
+    this.schema = this.options.schema;
+    this.theme = new theme_class();
+    this.template = this.options.template;
+    this.refs = this.options.refs || {};
+    this.uuid = 0;
+    this.__data = {};
+
+    var icon_class = JSONEditor.defaults.iconlibs[this.options.iconlib || JSONEditor.defaults.iconlib];
+    if(icon_class) this.iconlib = new icon_class();
+
+    this.root_container = this.theme.getContainer();
+    this.element.appendChild(this.root_container);
+
+    this.translate = this.options.translate || JSONEditor.defaults.translate;
+
+    // Fetch all external refs via ajax
+    this._loadExternalRefs(this.schema, function() {
+      self._getDefinitions(self.schema);
+
+      // Validator options
+      var validator_options = {};
+      if(self.options.custom_validators) {
+        validator_options.custom_validators = self.options.custom_validators;
+      }
+      self.validator = new JSONEditor.Validator(self,null,validator_options);
+
+      // Create the root editor
+      var schema = self.expandRefs(self.schema);
+      var editor_class = self.getEditorClass(schema);
+      self.root = self.createEditor(editor_class, {
+        jsoneditor: self,
+        schema: schema,
+        required: true,
+        container: self.root_container
+      });
+
+      self.root.preBuild();
+      self.root.build();
+      self.root.postBuild();
+
+      // Starting data
+      if(self.options.hasOwnProperty('startval')) self.root.setValue(self.options.startval);
+
+      self.validation_results = self.validator.validate(self.root.getValue());
+      self.root.showValidationErrors(self.validation_results);
+      self.ready = true;
+
+      // Fire ready event asynchronously
+      window.requestAnimationFrame(function() {
+        if(!self.ready) return;
+        self.validation_results = self.validator.validate(self.root.getValue());
+        self.root.showValidationErrors(self.validation_results);
+        self.trigger('ready');
+        self.trigger('change');
+      });
+    });
+  },
+  getValue: function() {
+    if(!this.ready) throw "JSON Editor not ready yet.  Listen for 'ready' event before getting the value";
+
+    return this.root.getValue();
+  },
+  setValue: function(value) {
+    if(!this.ready) throw "JSON Editor not ready yet.  Listen for 'ready' event before setting the value";
+
+    this.root.setValue(value);
+    return this;
+  },
+  validate: function(value) {
+    if(!this.ready) throw "JSON Editor not ready yet.  Listen for 'ready' event before validating";
+
+    // Custom value
+    if(arguments.length === 1) {
+      return this.validator.validate(value);
+    }
+    // Current value (use cached result)
+    else {
+      return this.validation_results;
+    }
+  },
+  destroy: function() {
+    if(this.destroyed) return;
+    if(!this.ready) return;
+
+    this.schema = null;
+    this.options = null;
+    this.root.destroy();
+    this.root = null;
+    this.root_container = null;
+    this.validator = null;
+    this.validation_results = null;
+    this.theme = null;
+    this.iconlib = null;
+    this.template = null;
+    this.__data = null;
+    this.ready = false;
+    this.element.innerHTML = '';
+
+    this.destroyed = true;
+  },
+  on: function(event, callback) {
+    this.callbacks = this.callbacks || {};
+    this.callbacks[event] = this.callbacks[event] || [];
+    this.callbacks[event].push(callback);
+
+    return this;
+  },
+  off: function(event, callback) {
+    // Specific callback
+    if(event && callback) {
+      this.callbacks = this.callbacks || {};
+      this.callbacks[event] = this.callbacks[event] || [];
+      var newcallbacks = [];
+      for(var i=0; i<this.callbacks[event].length; i++) {
+        if(this.callbacks[event][i]===callback) continue;
+        newcallbacks.push(this.callbacks[event][i]);
+      }
+      this.callbacks[event] = newcallbacks;
+    }
+    // All callbacks for a specific event
+    else if(event) {
+      this.callbacks = this.callbacks || {};
+      this.callbacks[event] = [];
+    }
+    // All callbacks for all events
+    else {
+      this.callbacks = {};
+    }
+
+    return this;
+  },
+  trigger: function(event) {
+    if(this.callbacks && this.callbacks[event] && this.callbacks[event].length) {
+      for(var i=0; i<this.callbacks[event].length; i++) {
+        this.callbacks[event][i].apply(this, []);
+      }
+    }
+
+    return this;
+  },
+  setOption: function(option, value) {
+    if(option === "show_errors") {
+      this.options.show_errors = value;
+      this.onChange();
+    }
+    // Only the `show_errors` option is supported for now
+    else {
+      throw "Option "+option+" must be set during instantiation and cannot be changed later";
+    }
+
+    return this;
+  },
+  getEditorClass: function(schema) {
+    var classname;
+
+    schema = this.expandSchema(schema);
+
+    $each(JSONEditor.defaults.resolvers,function(i,resolver) {
+      var tmp = resolver(schema);
+      if(tmp) {
+        if(JSONEditor.defaults.editors[tmp]) {
+          classname = tmp;
+          return false;
+        }
+      }
+    });
+
+    if(!classname) throw "Unknown editor for schema "+JSON.stringify(schema);
+    if(!JSONEditor.defaults.editors[classname]) throw "Unknown editor "+classname;
+
+    return JSONEditor.defaults.editors[classname];
+  },
+  createEditor: function(editor_class, options) {
+    options = $extend({},editor_class.options||{},options);
+    return new editor_class(options);
+  },
+  onChange: function() {
+    if(!this.ready) return;
+
+    if(this.firing_change) return;
+    this.firing_change = true;
+
+    var self = this;
+
+    window.requestAnimationFrame(function() {
+      self.firing_change = false;
+      if(!self.ready) return;
+
+      // Validate and cache results
+      self.validation_results = self.validator.validate(self.root.getValue());
+
+      if(self.options.show_errors !== "never") {
+        self.root.showValidationErrors(self.validation_results);
+      }
+      else {
+        self.root.showValidationErrors([]);
+      }
+
+      // Fire change event
+      self.trigger('change');
+    });
+
+    return this;
+  },
+  compileTemplate: function(template, name) {
+    name = name || JSONEditor.defaults.template;
+
+    var engine;
+
+    // Specifying a preset engine
+    if(typeof name === 'string') {
+      if(!JSONEditor.defaults.templates[name]) throw "Unknown template engine "+name;
+      engine = JSONEditor.defaults.templates[name]();
+
+      if(!engine) throw "Template engine "+name+" missing required library.";
+    }
+    // Specifying a custom engine
+    else {
+      engine = name;
+    }
+
+    if(!engine) throw "No template engine set";
+    if(!engine.compile) throw "Invalid template engine set";
+
+    return engine.compile(template);
+  },
+  _data: function(el,key,value) {
+    // Setting data
+    if(arguments.length === 3) {
+      var uuid;
+      if(el.hasAttribute('data-jsoneditor-'+key)) {
+        uuid = el.getAttribute('data-jsoneditor-'+key);
+      }
+      else {
+        uuid = this.uuid++;
+        el.setAttribute('data-jsoneditor-'+key,uuid);
+      }
+
+      this.__data[uuid] = value;
+    }
+    // Getting data
+    else {
+      // No data stored
+      if(!el.hasAttribute('data-jsoneditor-'+key)) return null;
+
+      return this.__data[el.getAttribute('data-jsoneditor-'+key)];
+    }
+  },
+  registerEditor: function(editor) {
+    this.editors = this.editors || {};
+    this.editors[editor.path] = editor;
+    return this;
+  },
+  unregisterEditor: function(editor) {
+    this.editors = this.editors || {};
+    this.editors[editor.path] = null;
+    return this;
+  },
+  getEditor: function(path) {
+    if(!this.editors) return;
+    return this.editors[path];
+  },
+  watch: function(path,callback) {
+    this.watchlist = this.watchlist || {};
+    this.watchlist[path] = this.watchlist[path] || [];
+    this.watchlist[path].push(callback);
+
+    return this;
+  },
+  unwatch: function(path,callback) {
+    if(!this.watchlist || !this.watchlist[path]) return this;
+    // If removing all callbacks for a path
+    if(!callback) {
+      this.watchlist[path] = null;
+      return this;
+    }
+
+    var newlist = [];
+    for(var i=0; i<this.watchlist[path].length; i++) {
+      if(this.watchlist[path][i] === callback) continue;
+      else newlist.push(this.watchlist[path][i]);
+    }
+    this.watchlist[path] = newlist.length? newlist : null;
+    return this;
+  },
+  notifyWatchers: function(path) {
+    if(!this.watchlist || !this.watchlist[path]) return this;
+    for(var i=0; i<this.watchlist[path].length; i++) {
+      this.watchlist[path][i]();
+    }
+  },
+  isEnabled: function() {
+    return !this.root || this.root.isEnabled();
+  },
+  enable: function() {
+    this.root.enable();
+  },
+  disable: function() {
+    this.root.disable();
+  },
+  _getDefinitions: function(schema,path) {
+    path = path || '#/definitions/';
+    if(schema.definitions) {
+      for(var i in schema.definitions) {
+        if(!schema.definitions.hasOwnProperty(i)) continue;
+        this.refs[path+i] = schema.definitions[i];
+        if(schema.definitions[i].definitions) {
+          this._getDefinitions(schema.definitions[i],path+i+'/definitions/');
+        }
+      }
+    }
+  },
+  _getExternalRefs: function(schema) {
+    var refs = {};
+    var merge_refs = function(newrefs) {
+      for(var i in newrefs) {
+        if(newrefs.hasOwnProperty(i)) {
+          refs[i] = true;
+        }
+      }
+    };
+
+    if(schema.$ref && typeof schema.$ref !== "object" && schema.$ref.substr(0,1) !== "#" && !this.refs[schema.$ref]) {
+      refs[schema.$ref] = true;
+    }
+
+    for(var i in schema) {
+      if(!schema.hasOwnProperty(i)) continue;
+      if(schema[i] && typeof schema[i] === "object" && Array.isArray(schema[i])) {
+        for(var j=0; j<schema[i].length; j++) {
+          if(schema[i][j] && typeof schema[i][j]==="object") {
+            merge_refs(this._getExternalRefs(schema[i][j]));
+          }
+        }
+      }
+      else if(schema[i] && typeof schema[i] === "object") {
+        merge_refs(this._getExternalRefs(schema[i]));
+      }
+    }
+
+    return refs;
+  },
+  _getFileBase: function() {
+    var fileBase = this.options.ajaxBase;
+    if (typeof fileBase === 'undefined') {
+      fileBase = this._getFileBaseFromFileLocation(document.location.toString());
+    }
+    return fileBase;
+  },
+  _getFileBaseFromFileLocation: function(fileLocationString) {
+    var pathItems = fileLocationString.split("/");
+    pathItems.pop();
+    return pathItems.join("/")+"/";
+  },
+  _loadExternalRefs: function(schema, callback, fileBase) {
+    fileBase = fileBase || this._getFileBase();
+    var self = this;
+    var refs = this._getExternalRefs(schema);
+    var done = 0, waiting = 0, callback_fired = false;
+
+    $each(refs,function(url) {
+      if(self.refs[url]) return;
+      if(!self.options.ajax) throw "Must set ajax option to true to load external ref "+url;
+      self.refs[url] = 'loading';
+      waiting++;
+
+      var fetchUrl=url;
+      if( fileBase!=url.substr(0,fileBase.length) && "http"!=url.substr(0,4) && "/"!=url.substr(0,1)) fetchUrl=fileBase+url;
+
+      var r = new XMLHttpRequest();
+      r.open("GET", fetchUrl, true);
+      if(self.options.ajaxCredentials) r.withCredentials=self.options.ajaxCredentials;
+      r.onreadystatechange = function () {
+        if (r.readyState != 4) return;
+        // Request succeeded
+        if(r.status === 200) {
+          var response;
+          try {
+            response = JSON.parse(r.responseText);
+          }
+          catch(e) {
+            window.console.log(e);
+            throw "Failed to parse external ref "+fetchUrl;
+          }
+          if(!response || typeof response !== "object") throw "External ref does not contain a valid schema - "+fetchUrl;
+
+          self.refs[url] = response;
+          self._loadExternalRefs(response,function() {
+            done++;
+            if(done >= waiting && !callback_fired) {
+              callback_fired = true;
+              callback();
+            }
+          }, self._getFileBaseFromFileLocation(fetchUrl));
+        }
+        // Request failed
+        else {
+          window.console.log(r);
+          throw "Failed to fetch ref via ajax- "+url;
+        }
+      };
+      r.send();
+    });
+
+    if(!waiting) {
+      callback();
+    }
+  },
+  expandRefs: function(schema) {
+    schema = $extend({},schema);
+
+    while (schema.$ref) {
+      var ref = schema.$ref;
+      delete schema.$ref;
+
+      if(!this.refs[ref]) ref = decodeURIComponent(ref);
+
+      schema = this.extendSchemas(schema,this.refs[ref]);
+    }