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plantuml server url decoder encoder
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# https://plantuml.com/text-encoding | |
# https://github.com/dougn/python-plantuml/blob/master/plantuml.py#L64 | |
import zlib | |
import base64 | |
maketrans = bytes.maketrans | |
plantuml_alphabet = string.digits + string.ascii_uppercase + string.ascii_lowercase + '-_' | |
base64_alphabet = string.ascii_uppercase + string.ascii_lowercase + string.digits + '+/' | |
b64_to_plantuml = maketrans(base64_alphabet.encode('utf-8'), plantuml_alphabet.encode('utf-8')) | |
plantuml_to_b64 = maketrans(plantuml_alphabet.encode('utf-8'), base64_alphabet.encode('utf-8')) | |
def plantuml_encode(plantuml_text): | |
"""zlib compress the plantuml text and encode it for the plantuml server""" | |
zlibbed_str = zlib.compress(plantuml_text.encode('utf-8')) | |
compressed_string = zlibbed_str[2:-4] | |
return base64.b64encode(compressed_string).translate(b64_to_plantuml).decode('utf-8') | |
def plantuml_decode(plantuml_url): | |
"""decode plantuml encoded url back to plantuml text""" | |
data = base64.b64decode(plantuml_url.translate(plantuml_to_b64).encode("utf-8")) | |
dec = zlib.decompressobj() # without check the crc. | |
header = b'x\x9c' | |
return dec.decompress(header + data).decode("utf-8") | |
url = "SyfFKj2rKt3CoKnELR1Io4ZDoSa70000" | |
print(plantuml_decode(url)) | |
print(plantuml_encode(plantuml_decode(url))) |
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