From 14666944d896189a71edec0367d07d3e968e730e Mon Sep 17 00:00:00 2001 From: Fabro Date: Mon, 16 Mar 2026 01:33:47 -0400 Subject: [PATCH] checkpoint MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ⚒️ Generated with [Fabro](https://fabro.sh) --- checkpoint.json | 56 ++++++----- nodes/extract_patch/script_invocation.json | 5 + nodes/extract_patch/script_timing.json | 5 + nodes/extract_patch/status.json | 6 ++ nodes/solve/diff.patch | 103 +++++++++++++++++++++ 5 files changed, 154 insertions(+), 21 deletions(-) create mode 100644 nodes/extract_patch/script_invocation.json create mode 100644 nodes/extract_patch/script_timing.json create mode 100644 nodes/extract_patch/status.json create mode 100644 nodes/solve/diff.patch diff --git a/checkpoint.json b/checkpoint.json index a82ac373e..6b9055152 100644 --- a/checkpoint.json +++ b/checkpoint.json @@ -1,13 +1,15 @@ { - "timestamp": "2026-03-16T05:33:45.145949Z", - "current_node": "solve", + "timestamp": "2026-03-16T05:33:47.387394Z", + "current_node": "extract_patch", "completed_nodes": [ "start", "setup", - "solve" + "solve", + "extract_patch" ], "node_retries": { "setup": 1, + "extract_patch": 1, "solve": 1, "start": 1 }, @@ -22,32 +24,22 @@ "graph.rankdir": "LR", "graph.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", "internal.retry_count.solve": 1, - "internal.thread_id": "setup", + "internal.thread_id": "solve", + "thread.solve.current_node": "extract_patch", "internal.retry_count.start": 1, - "command.output": "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\n## Context\n- failure_class: deterministic\n- failure_signature: setup|deterministic|script failed with exit code: ## stdout fatal: destination path '.' already exists and is not an empty directory.\n", + "command.output": "", + "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, 15.5k tokens in / 5.7k out\n - Files: /home/daytona/workspace/SOLUTION.md, /tmp/django-repo/django/contrib/auth/validators.py, /tmp/test_regex.py, /tmp/test_validators.py\n", "thread.start.current_node": "setup", "failure_class": "", "internal.retry_count.setup": 1, "last_response": "## Summary\n\nI've successfully fixed the GitHub issue **\"UsernameValidator allows trailing newline in usernames\"** in Django.\n\n### The Problem\nThe username validators used regex patterns with `^` and `", "thread.setup.current_node": "solve", + "internal.retry_count.extract_patch": 1, "last_stage": "solve", - "current_node": "solve" + "current_node": "extract_patch" }, "logs": [], "node_outcomes": { - "setup": { - "status": "fail", - "context_updates": { - "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n", - "command.stderr": "" - }, - "failure": { - "message": "Script failed with exit code: 128\n\n## stdout\nfatal: destination path '.' already exists and is not an empty directory.\n", - "failure_class": "deterministic" - }, - "duration_ms": 48 - }, "solve": { "status": "success", "context_updates": { @@ -72,18 +64,40 @@ ], "duration_ms": 71292 }, + "setup": { + "status": "fail", + "context_updates": { + "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n", + "command.stderr": "" + }, + "failure": { + "message": "Script failed with exit code: 128\n\n## stdout\nfatal: destination path '.' already exists and is not an empty directory.\n", + "failure_class": "deterministic" + }, + "duration_ms": 48 + }, + "extract_patch": { + "status": "success", + "context_updates": { + "command.output": "", + "command.stderr": "" + }, + "notes": "Script completed: git diff", + "duration_ms": 54 + }, "start": { "status": "success", "duration_ms": 0 } }, - "next_node_id": "extract_patch", + "next_node_id": "exit", "loop_failure_signatures": { "setup|deterministic|script failed with exit code: ## stdout fatal: destination path '.' already exists and is not an empty directory.": 1 }, "node_visits": { "setup": 1, + "solve": 1, "start": 1, - "solve": 1 + "extract_patch": 1 } } \ No newline at end of file diff --git a/nodes/extract_patch/script_invocation.json b/nodes/extract_patch/script_invocation.json new file mode 100644 index 000000000..6d29afc80 --- /dev/null +++ b/nodes/extract_patch/script_invocation.json @@ -0,0 +1,5 @@ +{ + "command": "git diff", + "language": "shell", + "timeout_ms": null +} \ No newline at end of file diff --git a/nodes/extract_patch/script_timing.json b/nodes/extract_patch/script_timing.json new file mode 100644 index 000000000..dea71c338 --- /dev/null +++ b/nodes/extract_patch/script_timing.json @@ -0,0 +1,5 @@ +{ + "duration_ms": 52, + "exit_code": 0, + "timed_out": false +} \ No newline at end of file diff --git a/nodes/extract_patch/status.json b/nodes/extract_patch/status.json new file mode 100644 index 000000000..f17faefe8 --- /dev/null +++ b/nodes/extract_patch/status.json @@ -0,0 +1,6 @@ +{ + "status": "success", + "notes": "Script completed: git diff", + "failure_reason": null, + "timestamp": "2026-03-16T05:33:47.386118+00:00" +} \ No newline at end of file diff --git a/nodes/solve/diff.patch b/nodes/solve/diff.patch new file mode 100644 index 000000000..4ea007dca --- /dev/null +++ b/nodes/solve/diff.patch @@ -0,0 +1,103 @@ +diff --git a/SOLUTION.md b/SOLUTION.md +new file mode 100644 +index 0000000..9d5bb32 +--- /dev/null ++++ b/SOLUTION.md +@@ -0,0 +1,65 @@ ++# Fix: UsernameValidator allows trailing newline in usernames ++ ++## Problem ++The `ASCIIUsernameValidator` and `UnicodeUsernameValidator` classes in `django/contrib/auth/validators.py` used regex patterns with `^` and `$` anchors, which have a quirk in Python: `$` matches both the end of string AND before a trailing newline character. ++ ++This caused the validators to incorrectly accept usernames ending with a newline (e.g., `"username\n"`). ++ ++## Root Cause ++The original regex patterns were: ++```python ++regex = r'^[\w.@+-]+$' ++``` ++ ++The `$` anchor in Python regex matches: ++1. The absolute end of string ++2. **Also** before a trailing newline character (POSIX behavior) ++ ++## Solution ++Changed the regex patterns to use `\A` and `\Z` anchors instead: ++```python ++regex = r'\A[\w.@+-]+\Z' ++``` ++ ++Where: ++- `\A` - matches only the absolute start of string (not after newlines) ++- `\Z` - matches only the absolute end of string (not before newlines) ++ ++## Changes Made ++Modified two validator classes in `django/contrib/auth/validators.py`: ++ ++1. **ASCIIUsernameValidator** (line 10): ++ - From: `regex = r'^[\w.@+-]+$'` ++ - To: `regex = r'\A[\w.@+-]+\Z'` ++ ++2. **UnicodeUsernameValidator** (line 20): ++ - From: `regex = r'^[\w.@+-]+$'` ++ - To: `regex = r'\A[\w.@+-]+\Z'` ++ ++## Testing ++Tested with both regexes to verify: ++ ++### OLD regex behavior (`^[\w.@+-]+$`): ++``` ++'validuser' -> MATCH ✓ (correct) ++'user-name' -> MATCH ✓ (correct) ++'validuser\n' -> MATCH ✗ (BUG - should not match) ++'user-name\n' -> MATCH ✗ (BUG - should not match) ++'user with space' -> NO MATCH ✓ (correct) ++'user!invalid' -> NO MATCH ✓ (correct) ++``` ++ ++### NEW regex behavior (`\A[\w.@+-]+\Z`): ++``` ++'validuser' -> MATCH ✓ (correct) ++'user-name' -> MATCH ✓ (correct) ++'validuser\n' -> NO MATCH ✓ (FIXED) ++'user-name\n' -> NO MATCH ✓ (FIXED) ++'user with space' -> NO MATCH ✓ (correct) ++'user!invalid' -> NO MATCH ✓ (correct) ++``` ++ ++## Impact ++- **Security**: Prevents acceptance of usernames with trailing newlines, which could bypass validation in some contexts ++- **Correctness**: Makes the validators behave as intended, accepting only alphanumeric characters plus `.@+-_` ++- **Compatibility**: No breaking changes - all previously valid usernames remain valid; only invalid usernames (with trailing newlines) are now properly rejected +diff --git a/validators.py b/validators.py +new file mode 100644 +index 0000000..74e31f5 +--- /dev/null ++++ b/validators.py +@@ -0,0 +1,25 @@ ++import re ++ ++from django.core import validators ++from django.utils.deconstruct import deconstructible ++from django.utils.translation import gettext_lazy as _ ++ ++ ++@deconstructible ++class ASCIIUsernameValidator(validators.RegexValidator): ++ regex = r'\A[\w.@+-]+\Z' ++ message = _( ++ 'Enter a valid username. This value may contain only English letters, ' ++ 'numbers, and @/./+/-/_ characters.' ++ ) ++ flags = re.ASCII ++ ++ ++@deconstructible ++class UnicodeUsernameValidator(validators.RegexValidator): ++ regex = r'\A[\w.@+-]+\Z' ++ message = _( ++ 'Enter a valid username. This value may contain only letters, ' ++ 'numbers, and @/./+/-/_ characters.' ++ ) ++ flags = 0 +\ No newline at end of file