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checkpoint

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Fabro 2026-03-16 07:59:13 -04:00
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commit f2a4602864
4 changed files with 44 additions and 14 deletions
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42
checkpoint.json
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@ -1,41 +1,49 @@
{
"timestamp": "2026-03-16T11:59:09.646073Z",
"current_node": "solve",
"timestamp": "2026-03-16T11:59:13.164019Z",
"current_node": "extract_patch",
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},
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"graph.rankdir": "LR",
"internal.fidelity": "compact",
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"current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n - Stdout:\n ```\n fatal: destination path '.' already exists and is not an empty directory.\n ```\n - Stderr: (empty)\n\n## Context\n- failure_class: deterministic\n- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.\n",
"current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n - Stdout:\n ```\n fatal: destination path '.' already exists and is not an empty directory.\n ```\n - Stderr: (empty)\n- **solve**: success\n - Model: claude-haiku-4-5, 8.1k tokens in / 3.5k out\n - Files: /tmp/django/django/contrib/auth/validators.py, /tmp/django/test_validators.py\n",
"last_response": "Perfect! The changes are complete and verified. Let me create a summary of the fix:\n\n## Summary\n\nI successfully fixed the Django username validator issue in `/tmp/django/django/contrib/auth/validators",
"thread.setup.current_node": "solve",
"response.solve": "Perfect! The changes are complete and verified. Let me create a summary of the fix:\n\n## Summary\n\nI successfully fixed the Django username validator issue in `/tmp/django/django/contrib/auth/validators.py`.\n\n### The Problem\nBoth `ASCIIUsernameValidator` and `UnicodeUsernameValidator` used the regex pattern `r'^[\\w.@+-]+$'`, which has a subtle Python regex quirk: the `$` anchor matches before a trailing newline, not just at the end of the string. This allowed usernames ending with a newline to be incorrectly accepted.\n\n### The Solution\nChanged both validators' regex patterns from `r'^[\\w.@+-]+$'` to `r'\\A[\\w.@+-]+\\Z'`:\n- Line 10: `ASCIIUsernameValidator.regex = r'\\A[\\w.@+-]+\\Z'`\n- Line 20: `UnicodeUsernameValidator.regex = r'\\A[\\w.@+-]+\\Z'`\n\nThe `\\A` and `\\Z` anchors have stricter semantics:\n- `\\A` matches only at the absolute start of the string (never at newlines)\n- `\\Z` matches only at the absolute end of the string (never before newlines)\n\n### Verification\nThe fix was tested with both validators and confirmed to:\n- ✅ Accept valid usernames: `validuser`, `user.name`, `user@example.com`, `user+tag`, `user-name`, `user_name`\n- ✅ Reject usernames with trailing newlines: `validuser\\n`\n- ✅ Reject usernames with embedded newlines: `user\\nname`\n\nThis is a minimal, targeted fix that directly addresses the issue without any side effects.",
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@ -58,9 +66,14 @@
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@ -75,13 +88,14 @@
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5
nodes/extract_patch/script_invocation.json Normal file
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@ -0,0 +1,5 @@
{
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5
nodes/extract_patch/script_timing.json Normal file
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6
nodes/extract_patch/status.json Normal file
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@ -0,0 +1,6 @@
{
"status": "success",
"notes": "Script completed: git diff",
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"timestamp": "2026-03-16T11:59:13.162224+00:00"
}