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bgneal@700
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1 """This module contains a function to upload an image file to a S3Bucket.
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bgneal@696
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2
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bgneal@700
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3 The image can be resized and a thumbnail can be generated and uploaded as well.
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bgneal@696
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4
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bgneal@696
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5 """
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bgneal@885
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6 from base64 import b64encode
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bgneal@696
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7 import logging
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bgneal@696
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8 from io import BytesIO
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bgneal@696
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9 import os.path
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bgneal@700
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10 import tempfile
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bgneal@696
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11 import uuid
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bgneal@696
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12
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bgneal@696
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13 from PIL import Image
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bgneal@696
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14
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bgneal@700
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15 from core.functions import temp_open
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bgneal@837
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16 from core.image import orient_image
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bgneal@700
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17
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bgneal@696
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18
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bgneal@696
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19 logger = logging.getLogger(__name__)
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bgneal@696
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20
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bgneal@696
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21
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bgneal@885
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22 def make_key():
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bgneal@885
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23 """Generate a random key suitable for a filename"""
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bgneal@885
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24 return b64encode(uuid.uuid4().bytes, '-_').rstrip('=')
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bgneal@885
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25
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bgneal@885
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26
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bgneal@700
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27 def upload(fp, bucket, metadata=None, new_size=None, thumb_size=None):
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bgneal@700
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28 """Upload an image file to a given S3Bucket.
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bgneal@696
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29
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bgneal@700
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30 The image can optionally be resized and a thumbnail can be generated and
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bgneal@700
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31 uploaded as well.
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bgneal@696
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32
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bgneal@700
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33 Parameters:
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bgneal@700
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34 fp - The image file to process. This is expected to be an instance of
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bgneal@700
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35 Django's UploadedFile class. The file must have a name attribute and
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bgneal@700
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36 we expect the name to have an extension. This is extension is
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bgneal@700
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37 used for the uploaded image and thumbnail names.
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bgneal@700
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38 bucket - A core.s3.S3Bucket instance to upload to.
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bgneal@700
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39 metadata - If not None, must be a dictionary of metadata to apply to the
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bgneal@700
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40 uploaded file and thumbnail.
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bgneal@700
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41 new_size - If not None, the image will be resized to the dimensions
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bgneal@700
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42 specified by new_size, which must be a (width, height) tuple.
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bgneal@700
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43 thumb_size - If not None, a thumbnail image will be created with the
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bgneal@700
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44 dimensions specified by thumb_size, which must be a (width,
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bgneal@700
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45 height) tuple. The thumbnail will use the same metadata, if
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bgneal@700
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46 present, as the image. The thumbnail filename will be the
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bgneal@700
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47 same basename as the image with a 't' appended. The
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bgneal@700
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48 extension will be the same as the original image.
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bgneal@700
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49
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bgneal@700
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50 A tuple is returned: (image_url, thumb_url) where thumb_url will be None if
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bgneal@700
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51 a thumbnail was not requested.
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bgneal@696
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52 """
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bgneal@696
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53
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bgneal@738
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54 filename = fp.name
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bgneal@737
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55 logger.info('Processing image file: %s', filename)
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bgneal@700
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56
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bgneal@700
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57 # Trying to use PIL (or Pillow) on a Django UploadedFile is often
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bgneal@700
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58 # problematic because the file is often an in-memory file if it is under
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bgneal@700
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59 # a certain size. This complicates matters and many of the operations we try
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bgneal@700
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60 # to perform on it fail if this is the case. To get around these issues,
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bgneal@700
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61 # we make a copy of the file on the file system and operate on the copy.
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bgneal@700
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62 # First generate a unique name and temporary file path.
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bgneal@885
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63 unique_key = make_key()
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bgneal@700
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64 ext = os.path.splitext(fp.name)[1]
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bgneal@700
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65 temp_name = os.path.join(tempfile.gettempdir(), unique_key + ext)
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bgneal@696
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66
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bgneal@700
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67 # Write the UploadedFile to a temporary file on disk
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bgneal@700
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68 with temp_open(temp_name, 'wb') as temp_file:
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bgneal@700
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69 for chunk in fp.chunks():
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bgneal@700
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70 temp_file.write(chunk)
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bgneal@700
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71 temp_file.close()
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bgneal@696
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72
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bgneal@837
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73 # Re-orient if necessary
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bgneal@837
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74 image = Image.open(temp_name)
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bgneal@837
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75 changed, image = orient_image(image)
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bgneal@837
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76 if changed:
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bgneal@837
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77 image.save(temp_name)
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bgneal@837
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78
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bgneal@700
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79 # Resize image if necessary
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bgneal@700
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80 if new_size:
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bgneal@700
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81 image = Image.open(temp_name)
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bgneal@700
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82 if image.size > new_size:
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bgneal@700
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83 logger.debug('Resizing from {} to {}'.format(image.size, new_size))
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bgneal@700
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84 image.thumbnail(new_size, Image.ANTIALIAS)
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bgneal@700
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85 image.save(temp_name)
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bgneal@696
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86
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bgneal@700
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87 # Create thumbnail if necessary
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bgneal@700
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88 thumb = None
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bgneal@700
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89 if thumb_size:
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bgneal@700
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90 logger.debug('Creating thumbnail {}'.format(thumb_size))
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bgneal@700
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91 image = Image.open(temp_name)
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bgneal@700
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92 image.thumbnail(thumb_size, Image.ANTIALIAS)
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bgneal@700
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93 thumb = BytesIO()
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bgneal@700
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94 image.save(thumb, format=image.format)
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bgneal@696
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95
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bgneal@700
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96 # Upload images to S3
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bgneal@700
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97 file_key = unique_key + ext
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bgneal@700
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98 logging.debug('Uploading image')
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bgneal@700
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99 image_url = bucket.upload_from_filename(file_key, temp_name, metadata)
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bgneal@696
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100
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bgneal@700
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101 thumb_url = None
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bgneal@700
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102 if thumb:
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bgneal@700
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103 logging.debug('Uploading thumbnail')
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bgneal@700
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104 thumb_key = '{}t{}'.format(unique_key, ext)
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bgneal@700
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105 thumb_url = bucket.upload_from_string(thumb_key,
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bgneal@700
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106 thumb.getvalue(),
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bgneal@700
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107 metadata)
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bgneal@696
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108
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bgneal@737
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109 logger.info('Completed processing image file: %s', filename)
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bgneal@696
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110
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bgneal@700
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111 return (image_url, thumb_url)
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