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python-meijer

  • What: Reverse engineered API for Meijer shopping list.
  • Why: I can't actually get in contact with a Meijer Engineer. Their Facebook team just "takes feedback." On n'est jamais servi si bien que par soi-même.
  • How: mitmproxy, Python with requests

Installation

pip install -e "git+https://github.com/dapperfu/python_Meijer.git#subdirectory=meijer&#egg=meijer"

Development Installation

git clone https://github.com/dapperfu/python_Meijer.git
cd python_Meijer
# Create & Activate virtual environment
python3 -mvenv venv
source venv/bin/activate
# Install development li
pip install -U pip wheel setuptools
pip install -r requirements.txt

Usage

Meijer login information is stored in the environmental variable MEIJER_API_KEY.

export MEIJER_API_KEY="user|pass"

  1. Don't use the same login for Meijer's shopping list as your Bank, 'k?
  2. If you use a | in your password, you can edit the delimiter in Meijer.py

Shell completion.

Shell completion through click

Add meijer Bash completion to the terminal:

_meijer_COMPLETE=bash_source meijer > ~/.meijer-complete.bash
echo ". ~/.meijer-complete.bash" >> ~/.bashrc

Shopping list.

$ meijer list
Usage: meijer list [OPTIONS] COMMAND [ARGS]...

  Meijer list manipulation.

Options:
  -p, --prompt  Prompt for mPerks username & password
  --help        Show this message and exit.

Commands:
  add    Add items to shopping list.
  clear  Clear current shopping list.
  show   Show current shopping list.

Show the list, add something, show the list again.

$ meijer list show
[ ] Check the box to mark complete
[ ] Click/Tap here to edit an item
[ ] Press and hold to drag and drop an item
$ meijer list add
Enter your shopping list. Complete with a blank line.
- Tacos
-
$ meijer list show
[ ] Tacos
[ ] Check the box to mark complete
[ ] Click/Tap here to edit an item
[ ] Press and hold to drag and drop an item

Clear the list:

meijer list clear
meijer list show

Fancy:

cat examples/list

$ meijer list add < examples/list
Enter your shopping list. Complete with a blank line.
- - - - - %

$ meijer list show
[ ] 8% Milk
[ ] 4% Milk
[ ] 2% Milk
[ ] 1% Milk

Development Tools.

Use shop_n_scan_faker.py with mitmproxy to fake any meijer store's location.

https://docs.mitmproxy.org/stable/addons-scripting/

# mitmproxy
mitmproxy -s shop_n_scan_faker.py

# mitmweb
mitmweb -s shop_n_scan_faker.py

Motivation

The Meijer "Shop & Scan" feature is pretty cool, however it has a lot of room for improvement.

  • The software barcode scanner is in software and slow. It also misreads the barcode often.
  • Hand held barcode scanners are cheap, fast and accurate.
  • It's hard to flip between your shopping list and the app.
  • You can't "parallel" shop with kids or SO. If you both start a shop and scan and try to checkout it'll only import the last one. (We found this one out the hardway).

Decompiling the Meijer.apk it looks like it's mostly just a REST app. So I setup a mitmproxy to watch for traffic.

Lessons Learned

Misc.

  • Shopping lists doesn't support Unicode, no emoji's for you.

You can't trick the Meijer App with mock locations.

Tests for Mock Location, in:

5.1.2:

mobile/meijer/com/meijergo/utils/location/LocationHelper.java:

public void onLocationChanged(Location location) {
    if (location != null) {
        if (location.hasAccuracy()) {
            if (this.sessionEnv == SessionEnvironment.PRODUCTION && location.isFromMockProvider()) {
                this.listener.onLocationReceived(0.0d, 0.0d, 0.0f);
            } else {
                this.listener.onLocationReceived(location.getLatitude(), location.getLongitude(), location.getAccuracy());
            }
        }
    }
}

5.3.0:

They updated it to give you a warning that Mock Locations are not allowed.

public void onLocationChanged(Location location) {
    if (location == null) {
        requestLocation();
        return;
    }
    LocationHelperListener locationHelperListener = this.listener;
    if (locationHelperListener != null) {
        locationHelperListener.onLocationReceived(location.getLatitude(), location.getLongitude(), location.isFromMockProvider());
    }
}