NAI Card Metadata

Tools

NAI card reader By No. 347972082
JSON tooltip userscript by No.348183782

I wrote a shitty violentmonkey script to quickly look at the json of cards. It was more just a thing for me to relearn web stuff, and I think someone was working on something similar, so I dunno how useful it is. You hover over the card and press control to make the box of json appear. Then hover over the box and press shift to make it go away. You can also double click the box to copy the json.

Getting metadata

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exiftool -naidata image.png | cut -b 35- | base64 -d

Python

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def get_naidata(image_filename):
    data = open(image_filename, "rb").read()
    loc = data.find(b"naidata")
    length = int.from_bytes(data[loc-8:loc-4], "big")
    return data[loc+8:loc+length]

Javascript

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function bytesToInt(buffer) {
    var value = 0;
    for (var i = 0; i < buffer.length; i++) {
        value = (value << 8) + buffer[i];
    }
    return value;
};

const NAIDATA = new Uint8Array([ 110, 97, 105, 100, 97, 116, 97 ]);
function isMatch(element, index, array) {
  for (var i=0; i<7; i++) {
    if (array[index+i] != NAIDATA[i]) return false;
  }
  return true;
}

function get_naidata(array) {
    /* array : Uint8Array from new Uint8Array( FileReader.readAsArrayBuffer() ) */
    var loc = array.findIndex(isMatch);
    var length = bytesToInt(array.slice(loc-8, loc-4));
    var result = array.slice(loc+8, loc+length);
    return new TextDecoder().decode(result);
}

Attaching metadata

naidata.conf

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%Image::ExifTool::UserDefined = (
    'Image::ExifTool::PNG::TextualData' => {
        naidata => { }
    }
);
1;

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1	exiftool -config naidata.conf -naidata="BASE64" image.png