此博客内图片均存于七牛云，为了方便操作，所有图片放置在同一个文件夹下，考虑到可能存在的文件重名问题，进行处理。
2023-11-05 Update：目前博客内图片暂由 nginx 代理并提供访问服务。
2023-11-07 Update：目前博客内的图片由自建的 minio 服务提供访问。
想文件名防冲撞，第一个想到的就是加入hash值。在密码学中，hash算法指的是将不定长的输入数据处理后得到定长的输出数据，用于保证文件的完整性，防止篡改或传输错误。MD5算法作为hash算法的一种，已经被破解（一定时间内找到相同MD5码的另一个文件），但是仅仅作为文件完整性验证仍然足够，同时计算时间也足够短。因此考虑在图片文件名称的最后加入MD5码，作为防止重名的验证。以下是完整代码：
"""
File name: hfn.py
Description: Rename the files in target directory by add hash.
Author: Cheng Shu
Date: 2021-06-20 15:19:46
LastEditTime: 2021-06-20 16:01:13
LastEditors: Cheng Shu
@Copyright © 2020 Cheng Shu
License: MIT License
"""
import os
import sys
import hashlib
def add_hash_to_name(file):
'''return modified name.'''
with open(file, 'rb') as f:
md5 = hashlib.md5()
# in case file is too big, actually it is useless for images on blog.
# compute hash value
for byte_block in iter(lambda: f.read(4096), b""):
md5.update(byte_block)
# print(md5.hexdigest())
# find last dot and determine where to add hash
new_name = ''
last_dot = file.find('.')
if last_dot == -1:
new_name = file + '-'+ md5.hexdigest()
elif md5.hexdigest() in file:
new_name = file
else:
new_name = file[:last_dot] + f"-{md5.hexdigest()}" + file[last_dot:]
return new_name
def main():
# validate the args
assert len(sys.argv) == 2, "Please Check args"
assert os.path.isdir(sys.argv[1]), "Path is not validate!"
path = sys.argv[1]
os.chdir(path)
# load file list, and add hash to every file
# if hash is not needed, print any character before enter.
for file in os.listdir('.'):
if not os.path.isfile(file):
continue
if file[0] == '.':
continue
print(f"ready to file: [{file}], go on with Enter, omit with any char:", end='')
s = input()
if (len(s) != 0):
continue
new_name = add_hash_to_name(file)
os.rename(file, new_name)
print(f"{file} -> {new_name}")
if (__name__ == "__main__"):
main()
调用方式：
$ python3 hfn.py [folder]
例如：
$ python3 .\hfn.py ./test
ready to file: [a.py], go on with Enter, omit with any char:
a.py -> a-a8f04b565e11f11cf5665250dfa1891f.py
ready to file: [b], go on with Enter, omit with any char:
b -> b-2d02e669731cbade6a64b58d602cf2a4