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content_hash.decode()   A
last analyzed

↳ Parent: content_hash

Complexity

Conditions 1

Size

Total Lines 11
Code Lines 4

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 0
CRAP Score 2

Importance

Changes 0
Metric Value
cc 1
eloc 4
nop 1
dl 0
loc 11
ccs 0
cts 4
cp 0
crap 2
rs 10
c 0
b 0
f 0
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"""Python implementation of EIP 1577 content hash."""
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from multiformats import multihash, multicodec, CID

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from .profiles import get_profile

            


            
                                                                                                            
                            
            
                                    
            
            

                
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def decode(chash: str) -> str:

            


            
                                                                        
                            
            
                                    
            
            

                
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    """

            


            
                                                                        
                            
            
                                    
            
            

                
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    Decode a content hash.

            


            
                                                                        
                            
            
                                    
            
            

                
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    :param hash: a hex string containing a content hash

            


            
                                                                        
                            
            
                                    
            
            

                
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    :return: the decoded content

            


            
                                                                        
                            
            
                                    
            
            

                
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    """

            


            
                                                                        
                            
            
                                    
            
            

                
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    codec, raw_data = multicodec.unwrap(bytes.fromhex(chash.lstrip('0x')))

            


            
                                                                        
                            
            
                                    
            
            

                
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    profile = get_profile(codec.name)

            


            
                                                                        
                            
            
                                    
            
            

                
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    return profile.decode(raw_data)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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def encode(codec: str, value: str) -> str:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    Encode a content hash.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    :param codec: a codec of a content hash

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    :param value: a value of a content hash

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    :return: the resulting content hash

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    value = get_profile(codec).encode(value)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    return multicodec.wrap(codec, value).hex()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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def get_codec(chash: str) -> str:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    Extract the codec of a content hash

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    :param hash: a hex string containing a content hash

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    :return: the extracted codec

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    codec, _ = multicodec.unwrap(bytes.fromhex(chash.lstrip('0x')))

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    return codec.name

            


            
                                                        
            
                                    
            
            

                
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