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https://github.com/QingdaoU/OnlineJudge.git
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60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
import datetime
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import random
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from base64 import b64encode
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from io import BytesIO
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from django.utils.crypto import get_random_string
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def rand_str(length=32, type="lower_hex"):
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"""
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生成指定长度的随机字符串或者数字, 可以用于密钥等安全场景
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:param length: 字符串或者数字的长度
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:param type: str 代表随机字符串，num 代表随机数字
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:return: 字符串
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"""
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if type == "str":
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return get_random_string(length, allowed_chars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
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elif type == "lower_str":
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return get_random_string(length, allowed_chars="abcdefghijklmnopqrstuvwxyz0123456789")
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elif type == "lower_hex":
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return random.choice("123456789abcdef") + get_random_string(length - 1, allowed_chars="0123456789abcdef")
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else:
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return random.choice("123456789") + get_random_string(length - 1, allowed_chars="0123456789")
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def build_query_string(kv_data, ignore_none=True):
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# {"a": 1, "b": "test"} -> "?a=1&b=test"
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query_string = ""
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for k, v in kv_data.items():
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if ignore_none is True and kv_data[k] is None:
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continue
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if query_string != "":
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query_string += "&"
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else:
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query_string = "?"
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query_string += (k + "=" + str(v))
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return query_string
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def img2base64(img):
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with BytesIO() as buf:
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img.save(buf, "gif")
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buf_str = buf.getvalue()
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img_prefix = "data:image/png;base64,"
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b64_str = img_prefix + b64encode(buf_str).decode("utf-8")
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return b64_str
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def datetime2str(value, format="iso-8601"):
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if format.lower() == "iso-8601":
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value = value.isoformat()
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if value.endswith("+00:00"):
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value = value[:-6] + "Z"
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return value
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return value.strftime(format)
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def timestamp2utcstr(value):
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return datetime.datetime.utcfromtimestamp(value).isoformat()
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