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#!/usr/bin/python
# -*- coding: UTF-8 -*-
from flask import Blueprint
from flask import current_app, abort, send_file, jsonify
import base64
from cStringIO import StringIO
from uuid import uuid4
from PIL import Image
import utils
from utils.decorator import login_required
from utils.images import create_thumbnail
from functions import do_decrypt_dek, do_encrypt_dek
from functions import no_preview_image
from views.tp_template import get_tenprint_template_zones
import config
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image_view = Blueprint( "image", __name__, template_folder = "template" )
def get_submission_uuid_for_file( file_uuid ):
"""
Get the related submission uuid for a file uuid.
"""
sql = """
SELECT submissions.uuid
FROM submissions
LEFT JOIN files ON submissions.id = files.folder
WHERE files.uuid = %s
"""
return config.db.query_fetchone( sql, ( file_uuid, ) )[ "uuid" ]
@image_view.route( config.baseurl + "/image/file/<file_id>/preview" )
@login_required
def image_file_serve( file_id ):
"""
Function to get an image from the database and return it as PNG preview image.
"""
current_app.logger.info( "Serve a preview for the file '{}'".format( file_id ) )
try:
submission_id = get_submission_uuid_for_file( file_id )
current_app.logger.debug( "submission id: '{}'".format( submission_id ) )
img, _ = image_serve( "thumbnails", file_id, submission_id )
if img == None:
current_app.logger.debug( "No image in the 'thumnnails' database. Recreating the thumbnail" )
img, _ = image_serve( "files", file_id, submission_id )
if img == None:
return abort( 404 )
current_app.logger.debug( "Image from the 'files' table: {}".format( img ) )
img = create_thumbnail( file_id, img, submission_id )
current_app.logger.debug( "Thumbnail image: {}".format( img ) )
buff = utils.images.pil2buffer( img, "PNG" )
return send_file( buff, mimetype = "image/png" )
except:
current_app.logger.error( "Error while creating the thumbnail. Serving a 'no preview' image" )
return send_file( no_preview_image(), mimetype = "image/png" )
@image_view.route( config.baseurl + "/image/segment/<tenprint_id>/<pc>" )
@login_required
def image_segment_serve( tenprint_id, pc ):
"""
Serve a preview for a segment image.
"""
current_app.logger.info( "Serving a segment image for the tenprint '{}', pc '{}'".format( tenprint_id, pc ) )
try:
submission_id = get_submission_uuid_for_file( tenprint_id )
current_app.logger.debug( "submission id: {}".format( submission_id ) )
img, file_segment_id = image_serve( "files_segments", ( tenprint_id, pc ), submission_id )
img = create_thumbnail( file_segment_id, img, submission_id )
current_app.logger.debug( "image: {}".format( img ) )
buff = utils.images.pil2buffer( img, "PNG" )
return send_file( buff, mimetype = "image/png" )
except:
current_app.logger.error( "Error while creating the thumbnail. Serving a 'no preview' image" )
return send_file( no_preview_image(), mimetype = "image/png" )
@image_view.route( config.baseurl + "/image/template/<tenprint_id>/<side>" )
@image_view.route( config.baseurl + "/image/template/<tenprint_id>/<side>/<action>" )
@login_required
def image_tp_template( tenprint_id, side, action = "full" ):
"""
Serve a template image, full-resolution or preview.
"""
current_app.logger.info( "Serve the tenprint template image for {}, {}".format( tenprint_id, side ) )
if side in [ "front", "back" ]:
img, _ = image_serve( "tenprint_cards", ( tenprint_id, side ), None )
if img == None:
return send_file( no_preview_image(), mimetype = "image/png" )
if action == "preview":
img.thumbnail( ( 500, 500 ) )
current_app.logger.debug( "image: {}".format( img ) )
buff = utils.images.pil2buffer( img, "PNG" )
return send_file( buff, mimetype = "image/png" )
else:
return abort( 403 )
def image_serve( table, image_id, submission_id ):
"""
Backend function to get the image from the database.
"""
current_app.logger.info( "Serve the image '{}' for submission '{}' from table '{}'".format( image_id, submission_id, table ) )
need_to_decrypt = True
if table == "files_segments":
if isinstance( image_id, tuple ):
tp, pc = image_id
sql = "SELECT data, uuid FROM {} WHERE tenprint = %s AND pc = %s".format( table )
p = ( tp, pc, )
else:
sql = "SELECT data, uuid FROM {} WHERE uuid = %s".format( table )
p = ( image_id, )
elif table in [ "files", "thumbnails" ]:
sql = "SELECT data, uuid, format FROM {} WHERE uuid = %s".format( table )
p = ( image_id, )
elif table == "tenprint_cards":
image_id, t = image_id
sql = "SELECT image_{} as data, id as uuid FROM {} WHERE id = %s".format( t, table )
p = ( image_id, )
need_to_decrypt = False
else:
current_app.logger.error( "table '{}' not authorized".format( table ) )
raise Exception( "table not authorized" )
current_app.logger.debug( "sql: {}".format( sql ) )
current_app.logger.debug( "params: {}".format( p ) )
data = config.db.query_fetchone( sql, p )
if data == None:
return None, None
else:
img = data[ "data" ]
rid = data[ "uuid" ]
if img == None:
return None, None
current_app.logger.debug( "image: {}...".format( img[ 0:20 ] ) )
current_app.logger.debug( "need_to_decrypt: {}".format( need_to_decrypt ) )
if "format" in data:
current_app.logger.debug( "format: {}".format( data[ "format" ] ) )
if need_to_decrypt:
img = do_decrypt_dek( img, submission_id )
if table == "files" and data[ "format" ].upper() == "NIST":
img = str2nist2img( img )
else:
img = str2img( img )
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current_app.logger.debug( "image: {}".format( img ) )
return img, rid
def str2img( data ):
"""
Convert a base64 string image to a PIL image.
"""
current_app.logger.info( "Convert string image to PIL format" )
if data == None:
return None
else:
img = base64.b64decode( data )
buff = StringIO()
buff.write( img )
buff.seek( 0 )
img = Image.open( buff )
current_app.logger.debug( "string: {}".format( data[ 0:20 ] ) )
current_app.logger.debug( "image: {}".format( img ) )
return img
def str2nist2img( data ):
current_app.logger.info( "Convert string NIST file to tenprint card image" )
if data == None:
return None
else:
img = base64.b64decode( data )
buff = StringIO()
buff.write( img )
buff.seek( 0 )
with lock:
n = NISTf( buff )
img = n.get_tenprintcard_front( 1000 )
current_app.logger.debug( "string: {}".format( data[ 0:20 ] ) )
current_app.logger.debug( "image: {}".format( img ) )
return img
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@image_view.route( config.baseurl + "/image/file/<image_id>/info" )
@login_required
def img_info( image_id ):
"""
Get and return the metadata for a particular image.
See do_img_info() for more informations.
"""
current_app.logger.info( "Serve image informations for image '{}'".format( image_id ) )
d = do_img_info( image_id )
if d != None:
return jsonify( d )
else:
return abort( 404 )
def do_img_info( image_id ):
"""
Retrieve the metadata for a particular image from the database.
"""
current_app.logger.debug( "Get image information from database for '{}'".format( image_id ) )
sql = "SELECT size, width, height, resolution, format FROM files WHERE uuid = %s"
d = config.db.query_fetchone( sql, ( image_id, ) )
for key, value in d.iteritems():
current_app.logger.debug( "{}: {}".format( key, value ) )
if d != None:
return dict( d )
else:
return None
@image_view.route( config.baseurl + "/image/segment/<tenprint_id>/start" )
@login_required
def image_tenprint_segmentation( tenprint_id ):
"""
Route to start the segmentation of a tenprint image into segments (fingers or palm images).
"""
current_app.logger.info( "Start segmentations for '{}'".format( tenprint_id ) )
ret = do_image_tenprint_segmentation( tenprint_id )
return jsonify( {
"error": False,
"data": ret
} )
def do_image_tenprint_segmentation( tenprint_id ):
"""
Backend function to create all the segments images for a tenprint souce image.
"""
sql = "SELECT size, resolution, type, format, data FROM files WHERE uuid = %s"
img = config.db.query_fetchone( sql, ( tenprint_id, ) )
for key, value in img.iteritems():
if isinstance( value, str ) and len( value ) > 20:
value = "{}...".format( value[ 0:20 ] )
current_app.logger.debug( "{}: {}".format( key, value ) )
res = img[ "resolution" ]
img_format = img[ "format" ]
side = {
1: "front",
2: "back"
}[ img[ "type" ] ]
current_app.logger.debug( "side: {}".format( side ) )
submission_id = get_submission_uuid_for_file( tenprint_id )
current_app.logger.debug( "Decrypt data with DEK" )
img = do_decrypt_dek( img[ "data" ], submission_id )
img = base64.b64decode( img )
buff = StringIO()
buff.write( img )
buff.seek( 0 )
img = Image.open( buff )
current_app.logger.debug( "image: {}".format( img ) )
sql = "SELECT template FROM file_template WHERE file = %s"
template_id = config.db.query_fetchone( sql, ( tenprint_id, ) )[ "template" ]
zones = get_tenprint_template_zones( template_id, side )
current_app.logger.debug( "Use '{}' as tenprint template".format( template_id ) )
for z in zones:
current_app.logger.debug( "Segmenting fpc '{}' ({})".format( z[ "pc" ], z[ "pc_name" ] ) )
tl_x, tl_y, br_x, br_y = map( lambda v: v * res / 2.54 , [ z[ "tl_x" ], z[ "tl_y" ], z[ "br_x" ], z[ "br_y" ] ] )
tmp = img.crop( ( tl_x, tl_y, br_x, br_y ) )
buff = StringIO()
tmp.save( buff, format = img_format )
buff.seek( 0 )
current_app.logger.debug( "Encrypting segment image with DEK" )
file_data = buff.getvalue()
file_data = base64.b64encode( file_data )
file_data = do_encrypt_dek( file_data, submission_id )
sql = "SELECT id FROM files_segments WHERE tenprint = %s AND pc = %s"
q = config.db.query_fetchone( sql, ( tenprint_id, z[ "pc" ], ) )
if q == None:
current_app.logger.debug( "Inserting to the database" )
sql = utils.sql.sql_insert_generate( "files_segments", [ "tenprint", "uuid", "pc", "data" ] )
data = ( tenprint_id, str( uuid4() ), z[ "pc" ], file_data )
config.db.query( sql, data )
else:
current_app.logger.debug( "Updating the database" )
sql = "UPDATE files_segments SET data = %s WHERE tenprint = %s AND pc = %s"
data = ( file_data, tenprint_id, z[ "pc" ] )
config.db.query( sql, data )
config.db.commit()
return True