76 lines
1.9 KiB
C#
76 lines
1.9 KiB
C#
/*
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* Copyright (c) 2025 ETH Zürich, IT Services
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.Linq;
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using CefSharp;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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using SafeExamBrowser.Logging.Contracts;
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namespace SafeExamBrowser.Browser.Integrations
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{
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internal class EdxIntegration : Integration
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{
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private readonly ILogger logger;
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public EdxIntegration(ILogger logger)
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{
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this.logger = logger;
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}
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internal override bool TrySearchUserIdentifier(Cookie cookie, out string userIdentifier)
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{
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userIdentifier = default;
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return false;
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}
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internal override bool TrySearchUserIdentifier(IRequest request, IResponse response, out string userIdentifier)
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{
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var cookies = response.Headers.GetValues("Set-Cookie");
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var userInfo = cookies?.FirstOrDefault(c => c.Contains("edx-user-info"));
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userIdentifier = default;
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if (TryParseCookie(userInfo, out var id) && HasChanged(id))
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{
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userIdentifier = id;
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logger.Info($"User identifier '{id}' detected by session cookie on response.");
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}
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return userIdentifier != default;
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}
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private bool TryParseCookie(string userInfo, out string userIdentifier)
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{
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userIdentifier = default;
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try
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{
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if (userInfo != default)
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{
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var start = userInfo.IndexOf("=") + 1;
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var end = userInfo.IndexOf("; expires");
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var cookie = userInfo.Substring(start, end - start);
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var sanitized = cookie.Replace("\\\"", "\"").Replace("\\054", ",").Trim('"');
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var json = JsonConvert.DeserializeObject(sanitized) as JObject;
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userIdentifier = json["username"].Value<string>();
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}
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}
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catch (Exception e)
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{
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logger.Error("Failed to parse user identifier!", e);
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}
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return userIdentifier != default;
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}
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}
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}
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