87 lines
2.2 KiB
Python
87 lines
2.2 KiB
Python
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#!/usr/bin/env python3
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# This script can be used together with the virtual_imgdev to simulate an
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# image based fingerprint reader.
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#
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# To use, set the FP_VIRTUAL_IMGDEV environment variable for both the
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# libfprint using program (e.g. fprintd) and this script.
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#
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# Usually this would work by adding it into the systemd unit file. The
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# best way of doing so is to create
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# /etc/systemd/system/fprintd.service.d/fprintd-test.conf
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#
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# [Service]
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# RuntimeDirectory=fprint
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# Environment=FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock
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# Environment=G_MESSAGES_DEBUG=all
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# ReadWritePaths=$RUNTIME_DIR
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#
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# After that run:
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#
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# systemctl daemon-reload
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# systemctl restart fprintd.service
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#
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# You may also need to disable selinux.
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#
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# Then run this script with e.g.
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# FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock ./sendvirtimg.py prints/whorl.png
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import cairo
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import sys
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import os
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import socket
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import struct
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if len(sys.argv) == 2:
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png = cairo.ImageSurface.create_from_png(sys.argv[1])
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# Cairo wants 4 byte aligned rows, so just add a few pixel if necessary
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w = png.get_width()
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h = png.get_height()
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w = (w + 3) // 4 * 4
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h = (h + 3) // 4 * 4
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img = cairo.ImageSurface(cairo.Format.A8, w, h)
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cr = cairo.Context(img)
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cr.set_source_rgba(1, 1, 1, 1)
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cr.paint()
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cr.set_source_rgba(0, 0, 0, 0)
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cr.set_operator(cairo.OPERATOR_SOURCE)
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cr.set_source_surface(png)
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cr.paint()
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else:
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sys.stderr.write('You need to pass a PNG with an alpha channel!\n')
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sys.exit(1)
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def write_dbg_img():
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dbg_img_rgb = cairo.ImageSurface(cairo.Format.RGB24, img.get_width(), img.get_height())
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dbg_cr = cairo.Context(dbg_img_rgb)
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dbg_cr.set_source_rgb(0, 0, 0)
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dbg_cr.paint()
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dbg_cr.set_source_rgb(1, 1, 1)
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dbg_cr.mask_surface(img, 0, 0)
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dbg_img_rgb.write_to_png('/tmp/test.png')
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#write_dbg_img()
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# Send image through socket
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sockaddr = os.environ['FP_VIRTUAL_IMGDEV']
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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sock.connect(sockaddr)
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mem = img.get_data()
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mem = mem.tobytes()
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assert len(mem) == img.get_width() * img.get_height()
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encoded_img = struct.pack('ii', img.get_width(), img.get_height())
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encoded_img += mem
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sock.sendall(encoded_img)
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