upstream/ipython Files · IPython/html/tests/notebook/inject_js.js

Handle kernel messages synchronously...

Handle kernel messages synchronously A problem can happen when two messages come in for different comms, where the second depends on the first (for example, the first might be a message setting the state of a widget, and the second triggering a view creation for the widget). Since comm message queues are independent of each other, the second message could be executed before the first message. This exposes a more fundamental assumption users are likely to have that messages from python are processed synchronously. Thanks to @dmadeka for reporting an error that led to discovering this issue.

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             inject_js.js
        
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                | application/javascript
            
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                JavascriptLexer
            
             / IPython / html / tests / notebook / inject_js.js
          
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      //

      // Test robustness about JS injection in different place

      //

      // This assume malicious document arrive to the frontend.

      //

      casper.notebook_test(function () {

          var messages = [];

          this.on('remote.alert', function (msg) {

              messages.push(msg);

          });

          this.evaluate(function () {

              var cell = IPython.notebook.get_cell(0);

              var json = cell.toJSON();

              json.execution_count = "<script> alert('hello from input prompts !')</script>";

              cell.fromJSON(json);

          });

          this.then(function () {

              this.test.assert(messages.length == 0, "Captured log message from script tag injection !");

          });

      });

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				//
				// Test robustness about JS injection in different place
				//
				// This assume malicious document arrive to the frontend.
				//

				casper.notebook_test(function () {
				var messages = [];
				this.on('remote.alert', function (msg) {
				messages.push(msg);
				});

				this.evaluate(function () {
				var cell = IPython.notebook.get_cell(0);
				var json = cell.toJSON();
				json.execution_count = "<script> alert('hello from input prompts !')</script>";
				cell.fromJSON(json);
				});

				this.then(function () {
				this.test.assert(messages.length == 0, "Captured log message from script tag injection !");
				});
				});