def fetch_case_image(domain, case_id, attachment_id, filesize_limit=0, width_limit=0, height_limit=0, fixed_size=None):
"""
Return (metadata, stream) information of best matching image attachment.
:param attachment_id: the identifier of the attachment to fetch
"""
if fixed_size is not None:
size_key = fixed_size
else:
size_key = OBJECT_ORIGINAL
constraint_dict = {}
if filesize_limit:
constraint_dict["content_length"] = filesize_limit
if height_limit:
constraint_dict["height"] = height_limit
if width_limit:
constraint_dict["width"] = width_limit
do_constrain = bool(constraint_dict)
cached_image = get_cached_case_attachment(domain, case_id, attachment_id, is_image=True)
meta, stream = cached_image.get(size_key=size_key)
if do_constrain:
def meets_constraint(constraints, meta):
for c, limit in constraints.items():
if meta[c] > limit:
return False
return True
if not meets_constraint(constraint_dict, meta):
# this meta is no good, find another one
lesser_keys = IMAGE_SIZE_ORDERING[0 : IMAGE_SIZE_ORDERING.index(size_key)]
lesser_keys.reverse()
is_met = False
for lesser_size in lesser_keys:
less_meta, less_stream = cached_image.get_size(lesser_size)
if meets_constraint(constraint_dict, less_meta):
meta = less_meta
stream = less_stream
is_met = True
break
if not is_met:
meta = None
stream = None
return meta, stream
def fetch_case_image(domain, case_id, attachment_id, filesize_limit=0, width_limit=0, height_limit=0, fixed_size=None):
"""
Return (metadata, stream) information of best matching image attachment.
:param attachment_id: the identifier of the attachment to fetch
"""
if fixed_size is not None:
size_key = fixed_size
else:
size_key = OBJECT_ORIGINAL
constraint_dict = {}
if filesize_limit:
constraint_dict['content_length'] = filesize_limit
if height_limit:
constraint_dict['height'] = height_limit
if width_limit:
constraint_dict['width'] = width_limit
do_constrain = bool(constraint_dict)
cached_image = get_cached_case_attachment(domain, case_id, attachment_id, is_image=True)
meta, stream = cached_image.get(size_key=size_key)
if do_constrain:
def meets_constraint(constraints, meta):
for c, limit in constraints.items():
if meta[c] > limit:
return False
return True
if not meets_constraint(constraint_dict, meta):
# this meta is no good, find another one
lesser_keys = IMAGE_SIZE_ORDERING[0:IMAGE_SIZE_ORDERING.index(size_key)]
lesser_keys.reverse()
is_met = False
for lesser_size in lesser_keys:
less_meta, less_stream = cached_image.get_size(lesser_size)
if meets_constraint(constraint_dict, less_meta):
meta = less_meta
stream = less_stream
is_met = True
break
if not is_met:
meta = None
stream = None
return meta, stream
def fetch_case_image(cls, case_id, attachment_key, filesize_limit=0, width_limit=0, height_limit=0, fixed_size=None):
"""
Return (metadata, stream) information of best matching image attachment.
attachment_key is the case property of the attachment
attachment filename is the filename of the original submission - full extension and all.
"""
if fixed_size is not None:
size_key = fixed_size
else:
size_key = OBJECT_ORIGINAL
constraint_dict = {}
if filesize_limit:
constraint_dict['content_length'] = filesize_limit
if height_limit:
constraint_dict['height'] = height_limit
if width_limit:
constraint_dict['width'] = width_limit
do_constrain = bool(constraint_dict)
# if size key is None, then one of the limit criteria are set
attachment_cache_key = "%(case_id)s_%(attachment)s" % {
"case_id": case_id,
"attachment": attachment_key,
}
cached_image = CachedImage(attachment_cache_key)
meta, stream = cls.cache_and_get_object(cached_image, case_id, attachment_key, size_key=size_key)
# now that we got it cached, let's check for size constraints
if do_constrain:
#check this size first
#see if the current size matches the criteria
def meets_constraint(constraints, meta):
for c, limit in constraints.items():
if meta[c] > limit:
return False
return True
if meets_constraint(constraint_dict, meta):
#yay, do nothing
pass
else:
#this meta is no good, find another one
lesser_keys = IMAGE_SIZE_ORDERING[0:IMAGE_SIZE_ORDERING.index(size_key)]
lesser_keys.reverse()
is_met = False
for lesser_size in lesser_keys:
less_meta, less_stream = cached_image.get_size(lesser_size)
if meets_constraint(constraint_dict, less_meta):
meta = less_meta
stream = less_stream
is_met = True
break
if not is_met:
meta = None
stream = None
return meta, stream
