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""" |
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The photo module contains the :class:`Photo` class, which is used to track |
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image objects (JPG, DNG, etc.). |
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.. moduleauthor:: Jaisen Mathai <[email protected]> |
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""" |
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from __future__ import print_function |
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from __future__ import absolute_import |
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import imghdr |
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import os |
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import re |
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import time |
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from datetime import datetime |
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from PIL import Image |
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from re import compile |
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from elodie import log |
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from .media import Media |
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class Photo(Media): |
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"""A photo object. |
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:param str source: The fully qualified path to the photo file |
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""" |
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__name__ = 'Photo' |
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#: Valid extensions for photo files. |
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extensions = ('arw', 'cr2', 'dng', 'gif', 'heic', 'jpeg', 'jpg', 'nef', 'rw2') |
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def __init__(self, source=None): |
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super(Photo, self).__init__(source) |
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# We only want to parse EXIF once so we store it here |
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self.exif = None |
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def get_date_taken(self): |
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"""Get the date which the photo was taken. |
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The date value returned is defined by the min() of mtime and ctime. |
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:returns: time object or None for non-photo files or 0 timestamp |
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""" |
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if(not self.is_valid()): |
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return None |
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source = self.source |
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seconds_since_epoch = min(os.path.getmtime(source), os.path.getctime(source)) # noqa |
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exif = self.get_exiftool_attributes() |
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if not exif: |
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return seconds_since_epoch |
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# We need to parse a string from EXIF into a timestamp. |
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# EXIF DateTimeOriginal and EXIF DateTime are both stored |
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# in %Y:%m:%d %H:%M:%S format |
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# we split on a space and then r':|-' -> convert to int -> .timetuple() |
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# the conversion in the local timezone |
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# EXIF DateTime is already stored as a timestamp |
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# Sourced from https://github.com/photo/frontend/blob/master/src/libraries/models/Photo.php#L500 # noqa |
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for key in self.exif_map['date_taken']: |
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try: |
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if(key in exif): |
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if(re.match('\d{4}(-|:)\d{2}(-|:)\d{2}', exif[key]) is not None): # noqa |
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dt, tm = exif[key].split(' ') |
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dt_list = compile(r'-|:').split(dt) |
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dt_list = dt_list + compile(r'-|:').split(tm) |
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dt_list = map(int, dt_list) |
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time_tuple = datetime(*dt_list).timetuple() |
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seconds_since_epoch = time.mktime(time_tuple) |
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break |
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except BaseException as e: |
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log.error(e) |
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pass |
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if(seconds_since_epoch == 0): |
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return None |
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return time.gmtime(seconds_since_epoch) |
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def is_valid(self): |
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"""Check the file extension against valid file extensions. |
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The list of valid file extensions come from self.extensions. This |
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also checks whether the file is an image. |
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:returns: bool |
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""" |
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source = self.source |
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# HEIC is not well supported yet so we special case it. |
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# https://github.com/python-pillow/Pillow/issues/2806 |
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extension = os.path.splitext(source)[1][1:].lower() |
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if(extension != 'heic'): |
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# gh-4 This checks if the source file is an image. |
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# It doesn't validate against the list of supported types. |
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if(imghdr.what(source) is None): |
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# imghdr won't detect all variants of images (https://bugs.python.org/issue28591) |
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# see https://github.com/jmathai/elodie/issues/281 |
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# before giving up, we use `pillow` imaging library to detect file type |
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# |
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# It is important to note that the library doesn't decode or load the |
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# raster data unless it really has to. When you open a file, |
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# the file header is read to determine the file format and extract |
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# things like mode, size, and other properties required to decode the file, |
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# but the rest of the file is not processed until later. |
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try: |
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im = Image.open(source) |
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except OSError: |
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return False |
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except IOError: |
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return False |
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if(im.format is None): |
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return False |
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121
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return extension in self.extensions |
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jmathai /
elodie
