368 lines
17 KiB
Python
368 lines
17 KiB
Python
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"""Native publication backends. Only Worker calls these methods.
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SFTP: verified immutable directories and an atomic POSIX symlink switch.
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S3: verified immutable object prefixes with a conditional current.json pointer.
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S3 requires a pointer-aware edge/gateway; it is not a naked S3 website switch.
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"""
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from __future__ import annotations
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import hashlib, io, json, os, posixpath, re, stat, uuid, zipfile
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from contextlib import contextmanager
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from pathlib import Path
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from urllib.parse import urlsplit
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from fastapi import HTTPException
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from . import secret_refs, safe_http
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from .deploy_agent import validate_archive
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SITE_RE=re.compile(r'^[a-zA-Z0-9][a-zA-Z0-9_-]{0,63}$')
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RELEASE_RE=re.compile(r'^[0-9a-f]{20}$')
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MAX_ARCHIVE=120*1024*1024
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def _env(target,field):
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return os.getenv(f'SITEFORGE_DEPLOY_{target.upper()}_{field}','').strip()
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def backend(target):
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if target not in ('staging','production'):raise HTTPException(400,'未知发布环境')
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value=_env(target,'TYPE') or 'agent'
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if value not in ('agent','sftp','s3'):raise HTTPException(503,'发布目标类型无效')
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return value
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def _root(value):
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if not value.startswith('/') or value=='/' or '\\' in value or '..' in value.split('/'):
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raise HTTPException(503,'远程发布根目录必须为安全的绝对路径')
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normalized=posixpath.normpath(value)
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if normalized in ('/','/tmp') or len(normalized)<4:raise HTTPException(503,'远程发布根目录范围过大')
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return normalized
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def config(target, *, check_files=False):
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kind=backend(target)
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if kind=='agent':return {'type':'agent'}
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public=_env(target,'PUBLIC_URL')
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parsed=urlsplit(public)
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if parsed.scheme!='https' or not parsed.netloc or parsed.username or parsed.password:
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raise HTTPException(503,'原生 SFTP/S3 发布必须提前配置 HTTPS PUBLIC_URL')
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if kind=='sftp':
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host=_env(target,'HOST');user=_env(target,'USERNAME')
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root=_root(_env(target,'REMOTE_ROOT'))
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known=_env(target,'KNOWN_HOSTS_FILE');key=_env(target,'SSH_KEY_FILE')
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if not host or not user or not known or not key or '/' in host or ':' in host:
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raise HTTPException(503,'SFTP 缺少主机、用户、known_hosts 或私钥配置')
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try:port=int(_env(target,'PORT') or 22)
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except ValueError:raise HTTPException(503,'SFTP 端口无效')
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if not 1<=port<=65535:raise HTTPException(503,'SFTP 端口无效')
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if check_files and (not Path(known).is_file() or not Path(key).is_file()):
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raise HTTPException(503,'SFTP 私钥或 known_hosts 文件未挂载')
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return {'type':kind,'host':host,'user':user,'root':root,'known_hosts':known,'ssh_key':key,'port':port}
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bucket=_env(target,'BUCKET');region=_env(target,'REGION');prefix=_env(target,'PREFIX') or 'siteforge'
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if not bucket or not region or not re.fullmatch(r'[a-zA-Z0-9][a-zA-Z0-9._-]{1,62}',bucket):
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raise HTTPException(503,'S3 存储桶或区域配置不完整')
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if prefix.startswith('/') or '..' in prefix.split('/') or not re.fullmatch(r'[a-zA-Z0-9/_-]+',prefix):
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raise HTTPException(503,'S3 对象前缀不安全')
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endpoint=_env(target,'ENDPOINT_URL')
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if endpoint:
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parsed=urlsplit(endpoint)
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if parsed.scheme!='https' or not parsed.netloc or parsed.username or parsed.password or parsed.path.strip('/'):
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raise HTTPException(503,'S3 兼容服务端点必须为 HTTPS 根地址')
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if _env(target,'POINTER_AWARE')!='1':
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raise HTTPException(503,'S3 必须配置可解析 current.json 的发布网关（POINTER_AWARE=1）')
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return {'type':kind,'bucket':bucket,'region':region,'prefix':prefix.strip('/'), 'endpoint':endpoint}
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def _archive(raw:bytes):
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if len(raw)>MAX_ARCHIVE:raise ValueError('超出单次发布大小上限')
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validate_archive(raw)
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output={}
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with zipfile.ZipFile(io.BytesIO(raw)) as z:
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for member in z.infolist():
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if member.is_dir():continue
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path=member.filename
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# validate_archive already checked all paths, duplicates, symlinks and size bounds.
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output[path]=z.read(member)
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hashes={k:hashlib.sha256(v).hexdigest() for k,v in output.items()}
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digest=hashlib.sha256(raw).hexdigest()
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return digest[:20],digest,output,hashes
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def _manifest(digest,hashes):
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return json.dumps({'sha256':digest,'files':hashes},sort_keys=True,separators=(',',':')).encode()
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def _probe(target,site,body):
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public_url=_env(target,'PUBLIC_URL')
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if not public_url:
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raise HTTPException(503,'正式发布必须配置站点 PUBLIC_URL 以执行上线探测')
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parsed=urlsplit(public_url)
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if parsed.scheme!='https' or not parsed.netloc or parsed.username or parsed.password:
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raise HTTPException(503,'PUBLIC_URL 必须为 HTTPS 网站地址')
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url=public_url.rstrip('/')+'/'
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try:
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response=safe_http.fetch(url,timeout=25,max_bytes=8_000_000)
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if response.status_code!=200 or hashlib.sha256(response.content).digest()!=hashlib.sha256(body).digest():
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raise HTTPException(502,'上线首页内容与构建版本不一致')
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except safe_http.OutboundError as exc:
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raise HTTPException(502,'上线地址不可访问，需检查发布和 DNS/CDN 状态') from exc
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return True
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# ---------------- SFTP ----------------
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@contextmanager
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def _sftp_connection(cfg):
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"""Strict host-key verification; private key mounted into Worker, never transmitted to API."""
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try:import paramiko
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except ImportError as exc:raise HTTPException(503,'缺少可选的 Paramiko SFTP 依赖') from exc
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client=paramiko.SSHClient()
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client.load_host_keys(cfg['known_hosts'])
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client.set_missing_host_key_policy(paramiko.RejectPolicy())
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try:
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client.connect(cfg['host'],port=cfg['port'],username=cfg['user'],
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key_filename=cfg['ssh_key'],look_for_keys=False,allow_agent=False,
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timeout=12,auth_timeout=12,banner_timeout=12)
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conn=client.open_sftp()
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try:yield conn
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finally:conn.close()
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finally:client.close()
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def _sftp_type(sftp,path):
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try:return sftp.lstat(path).st_mode
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except OSError:return None
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def _mkdirs(sftp,path):
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cur=''
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for part in path.split('/'):
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if not part:continue
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cur+='/'+part
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mode=_sftp_type(sftp,cur)
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if mode is None:
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sftp.mkdir(cur)
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mode=_sftp_type(sftp,cur)
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if not mode or not stat.S_ISDIR(mode):raise ValueError('远端目录包含符号链接或非目录')
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def _read(sftp,path,limit=4*1024*1024):
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with sftp.file(path,'rb') as f:raw=f.read(limit+1)
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if len(raw)>limit:raise ValueError('远程校验文件过大')
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return raw
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def _write(sftp,path,data):
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with sftp.file(path,'wb') as f:f.write(data);f.flush()
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def _current_sftp(sftp,root):
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pointer=root+'/current'
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mode=_sftp_type(sftp,pointer)
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if mode is None:return None
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if not stat.S_ISLNK(mode):raise ValueError('current 不是受管符号链接')
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link=sftp.readlink(pointer)
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if not re.fullmatch(r'releases/[0-9a-f]{20}',link):raise ValueError('current 指向不安全')
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return link.rsplit('/',1)[1]
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def _verify_sftp(sftp,root,release):
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folder=root+'/releases/'+release
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mode=_sftp_type(sftp,folder)
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if mode is None or not stat.S_ISDIR(mode):raise ValueError('远程版本目录缺失或不安全')
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raw=_read(sftp,folder+'/.siteforge-manifest.json')
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obj=json.loads(raw)
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checks=obj.get('files')
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if not isinstance(checks,dict) or 'index.html' not in checks:raise ValueError('远端文件清单无效')
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for name,expected in checks.items():
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if name.startswith('/') or '..' in name.split('/') or not re.fullmatch('[a-f0-9]{64}',str(expected)):
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raise ValueError('远端文件清单包含非法路径或哈希')
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mode=_sftp_type(sftp,folder+'/'+name)
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if mode is None or not stat.S_ISREG(mode):raise ValueError('远端发布资源缺失或不是普通文件')
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with sftp.file(folder+'/'+name,'rb') as f:
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dig=hashlib.sha256()
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while True:
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chunk=f.read(256*1024)
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if not chunk:break
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dig.update(chunk)
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if dig.hexdigest()!=expected:raise ValueError('远端文件哈希不匹配')
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return obj
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def _activate_sftp(sftp,root,release):
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previous=_current_sftp(sftp,root)
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candidate=root+'/current-'+release+'.next'
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if _sftp_type(sftp,candidate) is not None:raise ValueError('发现冲突的发布指针临时文件')
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sftp.symlink('releases/'+release,candidate)
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try:
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# OpenSSH posix-rename is atomic and replaces current. Fail closed if unsupported.
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sftp.posix_rename(candidate,root+'/current')
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finally:
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if _sftp_type(sftp,candidate) is not None:sftp.remove(candidate)
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if _current_sftp(sftp,root)!=release:raise ValueError('发布指针切换未确认')
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return previous
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def deploy_sftp(target,site,raw,cfg=None):
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cfg=cfg or config(target,check_files=True)
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release,digest,files,hashes=_archive(raw)
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root=cfg['root'].rstrip('/')+'/'+site
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with _sftp_connection(cfg) as sftp:
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_mkdirs(sftp,root+'/releases')
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folder=root+'/releases/'+release
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if _sftp_type(sftp,folder) is None:
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tmp=root+'/releases/.staging-'+release+'-'+uuid.uuid4().hex[:12]
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_mkdirs(sftp,tmp)
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try:
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for name,body in files.items():
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parent=posixpath.dirname(name)
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if parent:_mkdirs(sftp,tmp+'/'+parent)
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_write(sftp,tmp+'/'+name,body)
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_write(sftp,tmp+'/.siteforge-manifest.json',_manifest(digest,hashes))
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# Immutable version path is not overwritten on retry.
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sftp.rename(tmp,folder)
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except Exception:
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# No traffic change on failure. Interrupted transfers leave an
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# isolated temporary directory; a retry uses a fresh name.
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raise
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meta=_verify_sftp(sftp,root,release)
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if meta.get('sha256')!=digest:raise ValueError('现有版本摘要与当前构建不一致')
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previous=_current_sftp(sftp,root)
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if previous!=release:_activate_sftp(sftp,root,release)
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try:_probe(target,site,files['index.html'])
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except Exception:
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if previous and previous!=release:
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with _sftp_connection(cfg) as sftp:
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_verify_sftp(sftp,root,previous)
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_activate_sftp(sftp,root,previous)
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raise
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return {'published':True,'release':release,'previous':previous,'files':len(files),'sha256':digest,'target':target,'backend':'sftp'}
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def rollback_sftp(target,site,release,cfg=None,expected_home=None):
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if not RELEASE_RE.fullmatch(release):raise ValueError('无效的版本号')
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cfg=cfg or config(target,check_files=True)
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root=cfg['root'].rstrip('/')+'/'+site
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with _sftp_connection(cfg) as sftp:
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_verify_sftp(sftp,root,release)
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previous=_current_sftp(sftp,root)
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if previous!=release:_activate_sftp(sftp,root,release)
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content=_read(sftp,root+'/releases/'+release+'/index.html',8*1024*1024)
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try:_probe(target,site,expected_home if expected_home is not None else content)
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except Exception:
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if previous and previous!=release:
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with _sftp_connection(cfg) as sftp:_activate_sftp(sftp,root,previous)
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raise
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return {'rolled_back':True,'release':release,'backend':'sftp','target':target}
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# ---------------- S3 / compatible object store ----------------
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def _s3_client(cfg):
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try:import boto3
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except ImportError as exc:raise HTTPException(503,'缺少可选的 boto3 S3 依赖') from exc
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return boto3.client('s3',region_name=cfg['region'],endpoint_url=cfg['endpoint'] or None)
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def _s3_key(cfg,site,path):return cfg['prefix']+'/sites/'+site+'/'+path
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def _s3_bytes(s3,bucket,key,max_bytes=4*1024*1024):
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response=s3.get_object(Bucket=bucket,Key=key)
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data=response['Body'].read(max_bytes+1)
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if len(data)>max_bytes:raise ValueError('S3 读取超过限制')
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return data
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def _s3_current(s3,cfg,site):
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key=_s3_key(cfg,site,'current.json')
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try:
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response=s3.get_object(Bucket=cfg['bucket'],Key=key)
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except Exception as exc:
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code=getattr(exc,'response',{}).get('Error',{}).get('Code','')
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if str(code) in ('404','NoSuchKey','NotFound'):return None,None
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raise
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data=response['Body'].read(4096)
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obj=json.loads(data)
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if not RELEASE_RE.fullmatch(obj.get('release','')):raise ValueError('当前 S3 发布指针无效')
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return obj['release'],response.get('ETag')
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def _s3_verify(s3,cfg,site,release):
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path=_s3_key(cfg,site,'releases/'+release+'/')
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obj=json.loads(_s3_bytes(s3,cfg['bucket'],path+'.siteforge-manifest.json'))
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checks=obj['files']
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if 'index.html' not in checks:raise ValueError('S3 版本没有入口页')
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for name,digest in checks.items():
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if name.startswith('/') or '..' in name.split('/') or not re.fullmatch('[a-f0-9]{64}',str(digest)):
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raise ValueError('S3 文件清单路径或哈希非法')
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response=s3.get_object(Bucket=cfg['bucket'],Key=path+name)
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hasher=hashlib.sha256()
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while True:
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chunk=response['Body'].read(256*1024)
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if not chunk:break
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hasher.update(chunk)
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|
|
if hasher.hexdigest()!=digest:raise ValueError('S3 对象校验失败')
|
|||
|
|
return obj
|
|||
|
|
|
|||
|
|
def _s3_point(s3,cfg,site,release,previous,etag):
|
|||
|
|
key=_s3_key(cfg,site,'current.json')
|
|||
|
|
body=json.dumps({'release':release,'previous':previous},sort_keys=True).encode()
|
|||
|
|
args={'Bucket':cfg['bucket'],'Key':key,'Body':body,'ContentType':'application/json','CacheControl':'no-store'}
|
|||
|
|
if etag:args['IfMatch']=etag
|
|||
|
|
else:args['IfNoneMatch']='*'
|
|||
|
|
s3.put_object(**args)
|
|||
|
|
current,_=_s3_current(s3,cfg,site)
|
|||
|
|
if current!=release:raise ValueError('S3 发布指针未确认')
|
|||
|
|
|
|||
|
|
def _s3_immutable_put(s3,bucket,key,body,**extra):
|
|||
|
|
"""Create-only object write. A retry can reuse only byte-identical keys."""
|
|||
|
|
try:
|
|||
|
|
s3.put_object(Bucket=bucket,Key=key,Body=body,IfNoneMatch='*',**extra)
|
|||
|
|
return
|
|||
|
|
except Exception as exc:
|
|||
|
|
code=str(getattr(exc,'response',{}).get('Error',{}).get('Code',''))
|
|||
|
|
if code not in ('PreconditionFailed','412','ConditionalRequestConflict','409'):
|
|||
|
|
raise
|
|||
|
|
existing=_s3_bytes(s3,bucket,key,max_bytes=max(8_000_000,len(body)))
|
|||
|
|
if hashlib.sha256(existing).digest()!=hashlib.sha256(body).digest():
|
|||
|
|
raise ValueError('现有 S3 对象与当前发布文件不一致，禁止覆盖')
|
|||
|
|
|
|||
|
|
|
|||
|
|
def deploy_s3(target,site,raw,cfg=None):
|
|||
|
|
cfg=cfg or config(target)
|
|||
|
|
release,digest,files,hashes=_archive(raw)
|
|||
|
|
s3=_s3_client(cfg);bucket=cfg['bucket']
|
|||
|
|
base=_s3_key(cfg,site,'releases/'+release+'/')
|
|||
|
|
manifest_key=base+'.siteforge-manifest.json'
|
|||
|
|
try:
|
|||
|
|
exists=_s3_bytes(s3,bucket,manifest_key)
|
|||
|
|
except Exception as exc:
|
|||
|
|
code=getattr(exc,'response',{}).get('Error',{}).get('Code','')
|
|||
|
|
if str(code) not in ('404','NoSuchKey','NotFound'):raise
|
|||
|
|
exists=None
|
|||
|
|
if exists is None:
|
|||
|
|
for name,body in files.items():
|
|||
|
|
import mimetypes
|
|||
|
|
ct=mimetypes.guess_type(name)[0] or 'application/octet-stream'
|
|||
|
|
cache='no-cache' if name.endswith('.html') else 'public, max-age=31536000, immutable'
|
|||
|
|
_s3_immutable_put(s3,bucket,base+name,body,ContentType=ct,CacheControl=cache)
|
|||
|
|
_s3_immutable_put(s3,bucket,manifest_key,_manifest(digest,hashes),
|
|||
|
|
ContentType='application/json',CacheControl='no-store')
|
|||
|
|
manifest=_s3_verify(s3,cfg,site,release)
|
|||
|
|
if manifest.get('sha256')!=digest:raise ValueError('S3 版本摘要冲突')
|
|||
|
|
previous,etag=_s3_current(s3,cfg,site)
|
|||
|
|
if previous!=release:_s3_point(s3,cfg,site,release,previous,etag)
|
|||
|
|
try:_probe(target,site,files['index.html'])
|
|||
|
|
except Exception:
|
|||
|
|
if previous and previous!=release:
|
|||
|
|
current,next_etag=_s3_current(s3,cfg,site)
|
|||
|
|
if current==release:_s3_point(s3,cfg,site,previous,release,next_etag)
|
|||
|
|
raise
|
|||
|
|
return {'published':True,'release':release,'previous':previous,'files':len(files),'sha256':digest,'target':target,'backend':'s3'}
|
|||
|
|
|
|||
|
|
def rollback_s3(target,site,release,cfg=None,expected_home=None):
|
|||
|
|
if not RELEASE_RE.fullmatch(release):raise ValueError('无效的版本号')
|
|||
|
|
cfg=cfg or config(target)
|
|||
|
|
s3=_s3_client(cfg)
|
|||
|
|
_s3_verify(s3,cfg,site,release)
|
|||
|
|
previous,etag=_s3_current(s3,cfg,site)
|
|||
|
|
if previous!=release:_s3_point(s3,cfg,site,release,previous,etag)
|
|||
|
|
body=_s3_bytes(s3,cfg['bucket'],_s3_key(cfg,site,'releases/'+release+'/index.html'),8*1024*1024)
|
|||
|
|
try:_probe(target,site,expected_home if expected_home is not None else body)
|
|||
|
|
except Exception:
|
|||
|
|
if previous and previous!=release:
|
|||
|
|
current,new_etag=_s3_current(s3,cfg,site)
|
|||
|
|
if current==release:_s3_point(s3,cfg,site,previous,release,new_etag)
|
|||
|
|
raise
|
|||
|
|
return {'rolled_back':True,'release':release,'target':target,'backend':'s3'}
|
|||
|
|
|
|||
|
|
def deploy(target,site,archive):
|
|||
|
|
if not SITE_RE.fullmatch(site):raise ValueError('无效的网站标识')
|
|||
|
|
cfg=config(target,check_files=True)
|
|||
|
|
raw=Path(archive).read_bytes()
|
|||
|
|
if cfg['type']=='sftp':return deploy_sftp(target,site,raw,cfg)
|
|||
|
|
if cfg['type']=='s3':return deploy_s3(target,site,raw,cfg)
|
|||
|
|
raise ValueError('不是原生发布目标')
|
|||
|
|
|
|||
|
|
def rollback(target,site,release):
|
|||
|
|
if not SITE_RE.fullmatch(site):raise ValueError('无效的网站标识')
|
|||
|
|
cfg=config(target,check_files=True)
|
|||
|
|
if cfg['type']=='sftp':return rollback_sftp(target,site,release,cfg)
|
|||
|
|
if cfg['type']=='s3':return rollback_s3(target,site,release,cfg)
|
|||
|
|
raise ValueError('不是原生发布目标')
|