SmartDukaan – //trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java

Rev 37402 – Vivo IMEI activation: report Vivo's captcha verdict back to the ...

amit — Tue, 25 Aug 2026 20:57:24 +0530

amit – 2 file(s) modified
Vivo IMEI activation: report Vivo's captcha verdict back to the solver

Only this cron ever learns whether Vivo accepted a captcha (status 0 means it
was wrong), so it is the only place that can label the solver's training data.
After each checkCode response it now posts the image, the code and the outcome
to the solver's /verdict endpoint, which files the sample as accepted (the
prediction was right - a free label) or rejected (needs a human to label it).

The solver has been running at a measured 22.3% accept rate and no training
data was ever collected, so the model could not be improved at all.

Strictly best-effort: 2s connect / 3s read timeouts and every exception
swallowed. Data collection must never slow down or break IMEI activation.

The shared secret is read from CAPTCHA_VERDICT_TOKEN in the environment,
falling back to a captcha.verdict.token property, so it need not be committed.
Without a token the call is skipped entirely.

Also drops /tmp/captcha.jpg: the captcha bytes are needed in memory for the
verdict report anyway, so the two concurrently-scheduled Vivo jobs no longer
share one file and overwrite each other's image.

~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/VivoImeiActivationService.java

Rev 37393 – Vivo IMEI activation: validate captcha solver response before submitting to ...

amit — Tue, 25 Aug 2026 16:59:27 +0530

amit – 2 file(s) modified
Vivo IMEI activation: validate captcha solver response before submitting to Vivo

The captcha solver at 45.79.121.178 was down from 09-Jul-2026 to 25-Aug-2026
(uwsgi never restarted after a host reboot). nginx returned a 502 page for
every request. RestClient.executeJson returns the response body regardless of
HTTP status, so CaptchaService handed that HTML page to Vivo as the captcha
code and Vivo logged it as 'Found invalid captcha' - indistinguishable from an
ordinary wrong guess. The outage went unnoticed for 46 days.

CaptchaService now checks the response against the solver model's own 31-class
alphabet (^[1-9A-HK-NP-Z]{4}$) and returns null for anything else, logging the
offending payload. VivoImeiActivationService skips the IMEI when the code is
null instead of posting the garbage; it is retried on the next run.

Also drops a System.out.println of the full base64 captcha image.

~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/VivoImeiActivationService.java

Rev 30938 – Fixed Scheduling issues

amit.gupta — Fri, 09 Sep 2022 19:53:51 +0530

amit.gupta – 1 file(s) modified
Fixed Scheduling issues

~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java

Rev 30935 – Fixed captcha parsing now pointing custom captcha breaking service deployed ...

amit.gupta — Thu, 08 Sep 2022 19:01:50 +0530

amit.gupta – 2 file(s) modified
Fixed captcha parsing now pointing custom captcha breaking service deployed on IN linode

~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/Application.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java

Rev 30335 – Fixed vivo

amit.gupta — Mon, 25 Apr 2022 17:41:27 +0530

amit.gupta – 4 file(s) modified
Fixed vivo

~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/Application.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/migrations/RunOnceTasks.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java
~ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/VivoImeiActivationService.java

Rev 29337 –

amit.gupta — Mon, 04 Oct 2021 14:41:06 +0530

amit.gupta – 1 file(s) modified

+ /trunk/profitmandi-cron/src/main/java/com/smartdukaan/cron/scheduled/CaptchaService.java