185 lines
6.9 KiB
Python
185 lines
6.9 KiB
Python
import hashlib
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import hmac
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import json
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import os
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import time
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from datetime import datetime, timezone
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import requests
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import base64
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class JmCommon:
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# 请求域名和相关配置
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host = "visual.volcengineapi.com"
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path = "/"
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service = "cv"
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region = "cn-north-1"
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schema = "https"
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version = "2022-08-31"
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# API访问凭证
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ak = "AKLTZjVlOGU1NzA1YWZkNDExMzkzYzY5YTNlOTRmMTMxODg"
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sk = "WkdabU9UTXdNVEJpTmpWbE5HVTJZVGxtTnpWbU5XSTBaRGN5TW1NMk5tRQ=="
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# 项目路径
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project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "..", "..", "..", ".."))
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base_path = os.path.join(project_root, "src", "main", "python", "com", "dsideal", "aiSupport", "Util", "JiMeng", "Example")
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@staticmethod
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def sign_string_encoder(source):
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"""URL编码字符串，用于签名"""
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if source is None:
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return None
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# 不需要编码的字符
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safe_chars = set("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~")
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result = []
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for char in source:
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if char in safe_chars:
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result.append(char)
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elif char == ' ':
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result.append("%20")
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else:
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# 对其他字符进行URL编码
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result.append(f"%{ord(char):02X}")
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return ''.join(result)
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@staticmethod
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def hash_sha256(content):
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"""计算内容的SHA256哈希值"""
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try:
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md = hashlib.sha256()
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md.update(content)
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return md.hexdigest()
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except Exception as e:
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raise Exception(f"计算哈希值失败: {str(e)}")
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@staticmethod
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def hmac_sha256(key, content):
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"""使用HMAC-SHA256算法计算消息认证码"""
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try:
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h = hmac.new(key, content.encode('utf-8'), hashlib.sha256)
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return h.digest()
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except Exception as e:
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raise Exception(f"计算HMAC-SHA256失败: {str(e)}")
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@staticmethod
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def gen_signing_secret_key_v4(date, region, service):
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"""生成V4版本的签名密钥"""
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# 注意：这里sk需要解码，因为Java代码中sk是Base64编码的
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sk_bytes = base64.b64decode(JmCommon.sk)
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k_date = JmCommon.hmac_sha256(sk_bytes, date)
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k_region = JmCommon.hmac_sha256(k_date, region)
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k_service = JmCommon.hmac_sha256(k_region, service)
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return JmCommon.hmac_sha256(k_service, "request")
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@staticmethod
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def do_request(method, query_list, body, action):
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"""发送HTTP请求到火山引擎API"""
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date = datetime.now(timezone.utc)
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if body is None:
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body = b''
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# 计算请求体的SHA256哈希值
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x_content_sha256 = JmCommon.hash_sha256(body)
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# 格式化日期时间，用于请求头
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x_date = date.strftime("%Y%m%dT%H%M%SZ")
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short_x_date = x_date[:8] # 提取日期部分，用于凭证范围
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content_type = "application/json"
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sign_header = "host;x-date;x-content-sha256;content-type"
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# 构建查询参数字符串
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real_query_list = query_list.copy() if query_list else {}
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real_query_list["Action"] = action
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real_query_list["Version"] = JmCommon.version
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# 排序查询参数
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sorted_query = sorted(real_query_list.items())
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query_sb = []
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for key, value in sorted_query:
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encoded_key = JmCommon.sign_string_encoder(key)
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encoded_value = JmCommon.sign_string_encoder(str(value))
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query_sb.append(f"{encoded_key}={encoded_value}")
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query_string = "&" .join(query_sb)
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# 构建规范请求字符串，用于签名
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canonical_string = f"{method}\n{JmCommon.path}\n{query_string}\n"
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canonical_string += f"host:{JmCommon.host}\n"
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canonical_string += f"x-date:{x_date}\n"
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canonical_string += f"x-content-sha256:{x_content_sha256}\n"
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canonical_string += f"content-type:{content_type}\n\n"
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canonical_string += f"{sign_header}\n{x_content_sha256}"
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# 计算规范请求字符串的哈希值
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hash_canonical_string = JmCommon.hash_sha256(canonical_string.encode('utf-8'))
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# 构建凭证范围和签名字符串
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credential_scope = f"{short_x_date}/{JmCommon.region}/{JmCommon.service}/request"
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sign_string = f"HMAC-SHA256\n{x_date}\n{credential_scope}\n{hash_canonical_string}"
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# 生成签名密钥并计算签名
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sign_key = JmCommon.gen_signing_secret_key_v4(short_x_date, JmCommon.region, JmCommon.service)
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signature = hmac.new(sign_key, sign_string.encode('utf-8'), hashlib.sha256).hexdigest()
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# 构建URL
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url = f"{JmCommon.schema}://{JmCommon.host}{JmCommon.path}?{query_string}"
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# 设置请求头
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headers = {
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"Host": JmCommon.host,
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"X-Date": x_date,
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"X-Content-Sha256": x_content_sha256,
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"Content-Type": content_type,
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"Authorization": f"HMAC-SHA256 Credential={JmCommon.ak}/{credential_scope}, SignedHeaders={sign_header}, Signature={signature}"
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}
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# 发送请求
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try:
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response = requests.request(
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method=method,
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url=url,
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headers=headers,
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data=body,
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timeout=(30, 30) # 连接超时和读取超时
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)
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response.raise_for_status() # 如果状态码不是200，抛出异常
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return response.text
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except requests.exceptions.RequestException as e:
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raise Exception(f"API请求失败: {str(e)}")
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@staticmethod
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def download_file(file_url, save_file_path):
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"""从URL下载文件到指定路径"""
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try:
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# 确保目录存在
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os.makedirs(os.path.dirname(save_file_path), exist_ok=True)
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# 下载文件
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response = requests.get(file_url, timeout=30)
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response.raise_for_status()
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with open(save_file_path, 'wb') as f:
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f.write(response.content)
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file_size = os.path.getsize(save_file_path)
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print(f"文件下载成功，保存路径: {save_file_path}, 文件大小: {file_size}字节")
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except Exception as e:
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print(f"文件下载失败: {str(e)}")
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raise Exception(f"文件下载失败: {str(e)}")
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@staticmethod
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def query_task_result(task_id):
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"""查询异步任务结果"""
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req_key = "jimeng_vgfm_t2v_l20"
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action = "CVSync2AsyncGetResult"
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# 创建请求体
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req = {
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"task_id": task_id,
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"req_key": req_key
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}
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response_body = JmCommon.do_request("POST", {}, json.dumps(req).encode('utf-8'), action)
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return json.loads(response_body) |