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On Popularity of Web Browser JavaScript APIs
Schauer, Marek ; Burget, Radek (referee) ; Polčák, Libor (advisor)
In this work we present the design and implementation of a platform for automated measurement of the use of JavaScript APIs in a web browser. This platform is based on OpenWPM, which is used to instrument the web browser. In our architecture, the browser is extended with a modified Web API Manager extension, which allows to capture calls to JavaScript methods and log information about these calls. The platform was used to perform measurements on a 10,000 websites. From the analysis of the data obtained by the measurement, we found that the most used APIs over measured websites are APIs specified in HTML and DOM standards, High Resolution Time API and Web Cryptography API. Within the APIs that were implemented in Mozilla Firefox after 2016, we identified the Intersection Observer API, Background Tasks API and Resize Observer API as the most frequently used.
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Web API Blocking
Frandel, Martin ; Hranický, Radek (referee) ; Polčák, Libor (advisor)
The aim of this work is to obtain the web APIs used in the top 1 000 000 pages of the Tranco ranking along with their subpages using the Web API Manager extension, then analyze and categorize the obtained data. Design a mechanism for the JShelter extension supporting blocking of individual web APIs that have been evaluated as tracking or advertising, implement the solution and then test it. In total, 2 973 276 web pages were analyzed. The captured data was aggregated with respect to web API insecurity, analyzed and the results described in the paper, with some API calls being blocked up to 93.33 % of the time. I was able to develop a method for identifying problematic APIs. Using polynomial regression, I found polynomials that describe the blocking behavior towards individual web APIs and their methods. I implemented the blocking functionality in the JShelter extension and successfully tested the solution.
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Better JShelter System Testing
Konečný, David ; Hranický, Radek (referee) ; Polčák, Libor (advisor)
This thesis deals with the proposal of improving and implementation the system tests of the JShelter project. The system tests of the JShelter project contain certain shortcomings that will be removed. Furthermore, the system tests will also be improved and expanded with new functionalities based on website analysis methods. As part of this thesis, a new website crawling mechanism will also be proposed based on the already existing mechanism of Marek Schauer. This mechanism will be based on OpenWPM, Selenium and Kubernetes. Improved system tests will also be integrated into this mechanism. This mechanism will be implemented. The results obtained using this mechanism will also be evaluated.
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On Popularity of Web Browser JavaScript APIs
Schauer, Marek ; Burget, Radek (referee) ; Polčák, Libor (advisor)
In this work we present the design and implementation of a platform for automated measurement of the use of JavaScript APIs in a web browser. This platform is based on OpenWPM, which is used to instrument the web browser. In our architecture, the browser is extended with a modified Web API Manager extension, which allows to capture calls to JavaScript methods and log information about these calls. The platform was used to perform measurements on a 10,000 websites. From the analysis of the data obtained by the measurement, we found that the most used APIs over measured websites are APIs specified in HTML and DOM standards, High Resolution Time API and Web Cryptography API. Within the APIs that were implemented in Mozilla Firefox after 2016, we identified the Intersection Observer API, Background Tasks API and Resize Observer API as the most frequently used.
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