import os​
import tos​
from tos.models2 import PostSignatureCondition​
​
# Retrieve AKSK information from environment variables.​
ak = os.getenv('TOS_ACCESS_KEY')​
sk = os.getenv('TOS_SECRET_KEY')​
endpoint = "your endpoint"​
region = "your region"​
bucket_name = "bucket-test"​
object_key = "object-test"​
try:​
    client = tos.TosClientV2(ak, sk, endpoint, region)​
    # Signature​
    out = client.pre_signed_post_signature(bucket=bucket_name, key=object_key,​
                                            # # Additional information can be added through the optional parameter conditions.​
                                           conditions=[PostSignatureCondition(key='x-tos-acl', value='private')])​
​
    print("Algorithm:", out.algorithm)​
    print("Date:", out.date)​
    print("Policy:", out.policy)​
    print("Signature:", out.signature)​
    print("Credential:", out.credential)​
    print("OriginPolicy:", out.origin_policy)​
except tos.exceptions.TosClientError as e:​
    # Operation failed, catch client error, usually caused by invalid request parameters or network issues​
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))​
except tos.exceptions.TosServerError as e:​
    # Operation failed, catch server error, detailed error information can be obtained from the response​
    print('fail with server error, code: {}'.format(e.code))​
    # request id can be used to locate specific issues, it is strongly recommended to save it in the log.​
    print('error with request id: {}'.format(e.request_id))​
    print('error with message: {}'.format(e.message))​
    print('error with http code: {}'.format(e.status_code))​
    print('error with ec: {}'.format(e.ec))​
    print('error with request url: {}'.format(e.request_url))​
except Exception as e:​
    print('fail with unknown error: {}'.format(e))​