private async Task VerifyNoseLocation()

in packages/ekyc-api/src/ekyc-api/Utils/LivenessChecker.cs [354:398]
33 lines of code
8 McCabe index (conditional complexity)

        private async Task<string> VerifyNoseLocation(SessionObject session, Image imageToVerify,
            FaceDetail headOnImage)
        {
            var nosePointingFaces = await GetFaces(session.nosePointImageKey);

            if (nosePointingFaces.Count == 0)
                return $"No faces found in the nose verification image for session {session.Id}";

            // Get the largest face
            var nosePointingFace = nosePointingFaces.OrderByDescending(a => a.BoundingBox.Width + a.BoundingBox.Height)
                .FirstOrDefault();

            var noseLocation = nosePointingFace.Landmarks.FirstOrDefault(a => a.Type == LandmarkType.Nose);

            if (noseLocation == null)
                return "Nose not found in image.";

            // Check if it's in the bounds 

            if (noseLocation.X >= session.nosePointAreaLeft &&
                noseLocation.X <= session.nosePointAreaLeft + Globals.NosePointAreaDimensions)
            {
                if (noseLocation.Y >= session.nosePointAreaTop &&
                    noseLocation.Y <= session.nosePointAreaTop + Globals.NosePointAreaDimensions)
                {
                    // Check the yaw, pitch and roll of the face

                    var compareLandmarks = await CompareFacialLandmarks(session, nosePointingFace, headOnImage);

                    if (!compareLandmarks)
                        return
                            "Please do not move your shoulders while pointing your nose. Instead, tilt your head so that your nose fits within the bounds of the box.";
                }
                else
                {
                    return "Nose is not within the specified bounds.";
                }
            }
            else
            {
                return "Nose is not within the specified bounds.";
            }

            return null;
        }