def _get_previews(self):
"""Extract previews."""
if len(self.metadata.get_preview_properties()) > 0:
# Fetched previews key.
self.results["metadata"]["preview"] = []
for preview in self.metadata.get_preview_properties():
p = AutoVivification()
p["mime_type"] = preview.get_mime_type()
p["size"] = len(self.metadata.get_preview_image(preview).get_data())
p["ext"] = preview.get_extension()
p["dimensions"] = [preview.get_width(), preview.get_height()]
# Resize if needed, and store.
try:
img = str2image(self.metadata.get_preview_image(preview).get_data())
if preview.get_width() > 256 or preview.get_height() > 160:
p["original_file"] = save_file(image2str(img), content_type="image/jpeg")
img.thumbnail([256, 160], Image.ANTIALIAS)
p["file"] = save_file(image2str(img), content_type="image/jpeg")
except Exception as e:
logger.warning("Error reading preview: {0}".format(e))
continue
finally:
# Save.
self.results["metadata"]["preview"].append(p)
def __init__(self, mongo_id, file_name=None):
# Results storage.
self.results = AutoVivification()
# Store image id.
if mongo_id:
self.orig_id = mongo_id
else:
raise Exception("You have to pass the original image ID")
if file_name:
self.file_name = file_name
else:
self.file_name = None
# Read image data.
try:
self.file_data = get_file(self.orig_id).read()
except gridfs.errors.NoFile:
raise Exception("Image not found on GridFS storage")
# Save a temporary file, used for analysis which needs a file on disk.
temp_image = tempfile.NamedTemporaryFile(delete=False)
temp_image.write(self.file_data)
temp_image.close(
) # File is not immediately deleted because we used delete=False
self.temp_image = temp_image.name
def __init__(self, file_path):
try:
self.metadata = GExiv2.Metadata(file_path)
except Exception as e:
logger.warning("Unable to read image metadata: {0}".format(e))
self.metadata = None
self.results = AutoVivification()
def __init__(self, file_data):
self.file_data = file_data
self.results = AutoVivification()
def __init__(self, file_path):
self.file_path = file_path
self.results = AutoVivification()
def __init__(self):
# Results storage.
self.results = AutoVivification()
# Data (results) in the global dictionary (produced by other modules).
self.data = None