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Push — master ( 45ad00...ee14b4 )
by Andrew
01:31
created

UrlCache.calc_md5()   A

↳ Parent: UrlCache

Complexity

Conditions 4

Size

Total Lines 11

Duplication

Lines 0
Ratio 0 %
Metric Value
cc 4
dl 0
loc 11
rs 9.2
1 
import hashlib
2 
import threading
3 
from os.path import join
4 

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from django import template

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from django.conf import settings

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from settings import STATIC_URL

            


            
                                                                                                            
                            
            
                                    
            
            

                
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import base64

            


            
                                                                                                            
                            
            
                                    
            
            

                
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register = template.Library()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class UrlCache(object):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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	_md5_sum = {}

            


            
                                                                                                            
                            
            
                                    
            
            

                
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	_counter_lock = threading.Lock()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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	@classmethod

            


            
                                                                                                            
                            
            
                                    
            
            

                
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	def get_md5(cls, file):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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		try:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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			return cls._md5_sum[file]

            


            
                                                                                                            
                            
            
                                    
            
            

                
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		except KeyError:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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			with cls._counter_lock:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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				md5 = base64.urlsafe_b64encode(cls.calc_md5(file))

            


            
                                                                                                            
                            
            
                                    
            
            

                
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				value = '%s%s?v=%s' % (STATIC_URL, file, md5.decode('utf-8'))

            


            
                                                                                                            
                            
            
                                    
            
            

                
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				cls._md5_sum[file] = value

            


            
                                                                                                            
                            
            
                                    
            
            

                
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				return value

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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	@classmethod

            


            
                                                                        
                            
            
                                    
            
            

                
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	def calc_md5(cls, file):

            


            
                                                                        
                            
            
                                    
            
            

                
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		full_path = join(settings.STATIC_ROOT, file)

            


            
                                                                        
                            
            
                                    
            
            

                
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		with open(full_path, 'rb') as fh:

            


            
                                                                        
                            
            
                                    
            
            

                
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			m = hashlib.md5()

            


            
                                                                        
                            
            
                                    
            
            

                
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			while True:

            


            
                                                                        
                            
            
                                    
            
            

                
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				data = fh.read(8192)

            


            
                                                                        
                            
            
                                    
            
            

                
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				if not data:

            


            
                                                                        
                            
            
                                    
            
            

                
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					break

            


            
                                                                        
                            
            
                                    
            
            

                
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				m.update(data)

            


            
                                                                        
                            
            
                                    
            
            

                
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			return m.digest()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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@register.simple_tag

            


            
                                                                                                            
                            
            
                                    
            
            

                
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def md5url(model_object):

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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	return UrlCache.get_md5(model_object)

            


            
                                                        
            
                                    
            
            

                
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