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v1.8.1 — Drop Tesseract, single 16-digit reply

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@Gonzalez8 Gonzalez8 released this 22 May 17:12
· 44 commits to main since this release
v1.8.1
86695ca

Fix v1.8.0's keypad OCR failure

v1.8.0 used Tesseract to read the 10 clean keypad button PNGs and
build the letter→digit mapping automatically, asking the user for
just the 6 captcha digits. Production results: 0/10 buttons read
successfully. Local reproduction confirmed Tesseract systemically
confuses 1 with 7 on these images (the v7.4 decorative underline
fools it), and silently returns empty on the lighter-colored ones.
No amount of preprocessing fixed it reliably.

New approach

The solver now hands the user everything they need to read in a
single composed image:

  • Distorted captcha on top.
  • 10 keypad button PNGs in a strip below, each labelled 1–10.

The user replies with 16 digits in one go: the 10 keypad positions
(left to right) followed by the 6 captcha digits. Example reply if
the keypad reads 8 5 2 6 7 9 3 0 1 4 and the captcha is 198142:

8526793014198142

The solver maps captcha digits → keypad letters using the order the
user provided and returns the 6-letter click sequence to
CheckJCClient. From there it's the same as before: re-read DOM, click
each letter's current position, submit.

Why this is better than v1.8.0's OCR

  • 100% reliable for the cases v1.8.0 broke.
  • Zero new dependencies (Tesseract gone, image is smaller).
  • Same CaptchaSolver.solve() contract, so an LLMVisionSolver
    plugged in later reads the same 16 digits from the same composite
    image we already build for the human.

Trade-off: the user types 10 extra digits per fichaje (still 30
seconds total). The composite image's 1..10 labels make it obvious.

Files

  • Dropped keypad_reader.py, pytesseract, tesseract-ocr.
  • Kept Pillow for the image composition.
  • Bot listener now expects 16-digit replies.
  • pending_captcha.response widened to VARCHAR(32) (auto-migration
    on startup).

Image

ghcr.io/gonzalez8/checktime:1.8.1 / :1.8 / :latest

Upgrade

sed -i 's/^CHECK_TIME_VERSION=.*/CHECK_TIME_VERSION=1.8.1/' stack.env
docker compose pull app
docker compose up -d app

Schema migration is automatic. No new env vars.

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