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fix(submit): use file path over stdin; fix CF CodeMirror textarea (#305)

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## Problem

After the initial submit hardening, two issues remained: source code was
read in Lua and piped as stdin to the scraper (unnecessary roundtrip
since
the file exists on disk), and CF's `page.fill()` timed out on the hidden
`textarea[name="source"]` because CodeMirror owns the editor state.

## Solution

Pass the source file path as a CLI arg instead — AtCoder calls
`page.set_input_files(file_path)` directly, CF reads it with
`Path(file_path).read_text()`. Fix CF source injection via
`page.evaluate()`
into the CodeMirror instance. Extract `BROWSER_SUBMIT_NAV_TIMEOUT` as a
per-platform `defaultdict` (CF defaults to 2× nav timeout). Save the
buffer
with `vim.cmd.update()` before submitting.
This commit is contained in:
Barrett Ruth 2026-03-05 14:34:14 -05:00 • committed by GitHub
parent 127089c57f
commit a202725cc5
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28 changed files with 269 additions and 168 deletions
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9
scrapers/base.py
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@ -53,7 +53,7 @@ class BaseScraper(ABC):
self,
contest_id: str,
problem_id: str,
source_code: str,
file_path: str,
language_id: str,
credentials: dict[str, str],
) -> SubmitResult: ...
@ -114,14 +114,13 @@ class BaseScraper(ABC):
return 0 if result.success else 1
case "submit":
if len(args) != 5:
if len(args) != 6:
print(
self._submit_error(
"Usage: <platform> submit <contest_id> <problem_id> <language_id>"
"Usage: <platform> submit <contest_id> <problem_id> <language_id> <file_path>"
).model_dump_json()
)
return 1
source_code = sys.stdin.read()
creds_raw = os.environ.get("CP_CREDENTIALS", "{}")
try:
credentials = json.loads(creds_raw)
@ -129,7 +128,7 @@ class BaseScraper(ABC):
credentials = {}
language_id = get_language_id(self.platform_name, args[4]) or args[4]
result = await self.submit(
args[2], args[3], source_code, language_id, credentials
args[2], args[3], args[5], language_id, credentials
)
print(result.model_dump_json())
return 0 if result.success else 1