Module: GitFit::Source::Keep

Defined in:
lib/git_fit/source/keep.rb

Constant Summary collapse

PLACEHOLDER_POLYLINE = 
'gqqrFurkeU??'
AES_KEY = 
Base64.decode64('NTZmZTU5OzgyZzpkODczYw==').freeze
AES_IV = 
Base64.decode64('MjM0Njg5MjQzMjkyMDMwMA==').freeze
TIMESTAMP_THRESHOLD = 
3_600_000
HR_THRESHOLD = 
100

Class Method Summary collapse

Class Method Details

.aes_decrypt(data) ⇒ Object 



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# File 'lib/git_fit/source/keep.rb', line 42

def aes_decrypt(data)
  cipher = OpenSSL::Cipher.new('AES-128-CBC')
  cipher.decrypt
  cipher.key = AES_KEY
  cipher.iv = AES_IV
  cipher.update(data) + cipher.final
end

.compute_wgs_points(payload, run_data) ⇒ Object 



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# File 'lib/git_fit/source/keep.rb', line 67

def compute_wgs_points(payload, run_data)
  geo_points = payload[:geo_points]
  hr_data = payload[:hr_data]
  return [] unless geo_points&.any?

  start_time = run_data['startTime']
  use_absolute_ts = geo_points.first['timestamp'].to_i > TIMESTAMP_THRESHOLD
  effective_start = use_absolute_ts ? 0 : start_time

  geo_points.map do |p|
    lat, lng = Geo::CoordTransform.gcj02_to_wgs84_exact(p['latitude'], p['longitude'])
    ts = p['timestamp'] || p['unixTimestamp']
    pt_time = ts ? Time.at(effective_start / 1000.0 + ts.to_i / 10.0).utc : nil
    hr = find_nearest_hr(hr_data, ts, start_time)
    [lat, lng, p['altitude'], pt_time, hr]
  end
end

.decode_geo_points(geo_data) ⇒ Object 



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# File 'lib/git_fit/source/keep.rb', line 23

def decode_geo_points(geo_data)
  return nil unless geo_data
  raw = Base64.decode64(geo_data)
  decrypted = aes_decrypt(raw)
  decompressed = zlib_inflate(decrypted)
  JSON.parse(decompressed)
rescue StandardError
  nil
end

.decode_hr_data(hr_data) ⇒ Object 



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# File 'lib/git_fit/source/keep.rb', line 33

def decode_hr_data(hr_data)
  return nil unless hr_data
  raw = Base64.decode64(hr_data)
  decompressed = zlib_inflate(raw)
  JSON.parse(decompressed)
rescue StandardError
  nil
end

.find_nearest_hr(hr_data, geo_ts, start_time, threshold: HR_THRESHOLD) ⇒ Object 



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# File 'lib/git_fit/source/keep.rb', line 85

def find_nearest_hr(hr_data, geo_ts, start_time, threshold: HR_THRESHOLD)
  return nil unless hr_data&.any? && geo_ts

  normalize = lambda { |ts|
    if ts > TIMESTAMP_THRESHOLD
      ts - start_time / 100
    else
      ts
    end
  }

  target = normalize.call(geo_ts)

  nearest = nil
  min_diff = Float::INFINITY

  hr_data.each do |item|
    ts = item['timestamp']
    next unless ts

    diff = (normalize.call(ts) - target).abs
    if diff <= threshold && diff < min_diff
      nearest = item
      min_diff = diff
    end
  end

  hr = nearest&.dig('beatsPerMinute')
  hr&.positive? ? hr : nil
end

.zlib_inflate(data) ⇒ Object

Raises:

  • (Zlib::DataError) 


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# File 'lib/git_fit/source/keep.rb', line 50

def zlib_inflate(data)
  [-Zlib::MAX_WBITS, Zlib::MAX_WBITS, Zlib::MAX_WBITS + 16].each do |wbits|
    inflater = Zlib::Inflate.new(wbits)
    result = inflater.inflate(data)
    begin
      inflater.finish
    rescue StandardError
      nil
    end
    inflater.close
    return result
  rescue Zlib::DataError
    next
  end
  raise Zlib::DataError, 'cannot inflate data'
end