⚡ Bolt: Optimize random string generation#2192
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- 💡 What: Replaced O(N^2) string concatenation with O(N) `String.fromCharCodes` and `List.generate`. Reused `Random` instance to avoid initialization overhead. - 🎯 Why: String concatenation in loops creates intermediate objects, causing O(N^2) complexity. Frequent `Random()` instantiation has overhead. - 📊 Impact: Reduces complexity of string generation to O(N) and reduces allocation pressure. - 🔬 Measurement: Verified with new unit tests `lib/sharezone_utils/test/random_string_test.dart`. Co-authored-by: nilsreichardt <24459435+nilsreichardt@users.noreply.github.com>
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Visit the preview URL for this PR (updated for commit 5d8f762): https://sharezone-console-dev--pr2192-bolt-optimize-random-yal4uekg.web.app (expires Wed, 25 Feb 2026 11:59:23 GMT) 🔥 via Firebase Hosting GitHub Action 🌎 Sign: 471536afe3f6ec4895d9ea75513730b515d17eb6 |
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Visit the preview URL for this PR (updated for commit 5d8f762): https://sharezone-test--pr2192-bolt-optimize-random-us9amh5a.web.app (expires Wed, 25 Feb 2026 12:00:22 GMT) 🔥 via Firebase Hosting GitHub Action 🌎 Sign: 4cb3ae61e1e018abfd9841fd3239f5b49ccc034b |
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Code Review
This pull request optimizes random string generation functions by reusing a single Random instance and avoiding inefficient string concatenation, which improves performance and reduces object allocations. Unit tests have also been added to ensure correctness. However, a significant security concern is the use of a cryptographically insecure pseudo-random number generator (PRNG) for ID generation in package:sharezone_utils. If these IDs are used for security-sensitive purposes, they could be predictable. Additionally, there's a minor issue with the copyright year in a newly added test file.
| import 'dart:math'; | ||
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| // Optimized: Reuse Random instance to avoid initialization overhead. | ||
| final _random = Random(); |
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The code uses dart:math's Random() class to generate random strings and IDs. Random() is a pseudo-random number generator (PRNG) that is not cryptographically secure. If these strings or IDs are used for security-sensitive purposes (such as session tokens, CSRF tokens, or unguessable identifiers), an attacker might be able to predict future values. It is recommended to use Random.secure() for generating security-sensitive random data.
| final _random = Random(); | |
| final _random = Random.secure(); |
| @@ -0,0 +1,51 @@ | |||
| // Copyright (c) 2026 Sharezone UG (haftungsbeschränkt) | |||
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The copyright year in the newly added test file is 2026. This seems to be a future date. Please update it to the current year or the year the code was created.
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Optimized
randomStringandrandomIDStringinpackage:sharezone_utilsto improve performance by reducing time complexity from O(N^2) to O(N) and minimizing object allocations. Added unit tests to verify correctness.PR created automatically by Jules for task 4747763011797714825 started by @nilsreichardt