50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
import hashlib
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import urllib3
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import os
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class Hashi:
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url_headers = {"user-agent": "hashi (a file hash checker)/0.1"}
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hash_algorithm = hashlib.sha256()
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encoded = "utf-8"
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def __init__(self):
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"""Initialise libraries."""
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self.http = urllib3.PoolManager(headers=self.url_headers)
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urllib3.disable_warnings()
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self.hash_update = self.hash_algorithm.update
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self.hash_hex = self.hash_algorithm.hexdigest
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def fetch_url(self, url, path):
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"""Fetch a remote text url and save the contents as an UTF-8 file."""
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resp = self.http.request("GET", url)
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os.makedirs(path.rsplit("/", 1)[0], exist_ok=True)
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with open(path, "w", encoding=self.encoded) as fh:
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fh.write(resp.data.decode(self.encoded))
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def get_hash(self, file_path):
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"""Given a text file path, get the hash of the file contents."""
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with open(file_path, "r") as fh:
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bf = fh.read()
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self.hash_update(bf.encode(self.encoded))
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return self.hash_hex()
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def check_hash(self, file_path, hash_path):
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"""Compare a file hash with another previously saved hash. Return a
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dictionary with a boolean indicating whether the file hash has changed,
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the old and new hashes."""
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has_change = {"changed": False, "old": "", "new": ""}
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cached_hash = ""
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new_hash = self.get_hash(file_path)
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try:
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with open(hash_path, "r") as fh:
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cached_hash = fh.read()
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except FileNotFoundError:
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# Treat as changed (a call to update)
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has_change = {"changed": True, "old": "", "new": new_hash}
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if new_hash != cached_hash:
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has_change = {"changed": True, "old": cached_hash, "new": new_hash}
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return has_change
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