def __init__(self, request, url, referer=None):
self.request = request
self.url = url
if not referer or is_referer_force_url(url):
referer = get_referer_of_url(url)
self.referer = referer
self.session = None
self.response = None
async def image_proxy(request, url, referer=None):
if not referer or is_referer_force_url(url):
referer = get_referer_of_url(url)
LOG.info(f'proxy image {url} referer={referer}')
session = response = None
async def do_cleanup():
nonlocal session, response
if response:
response.close()
if session:
await session.close()
try:
await check_private_address(url)
user_agent = DEFAULT_USER_AGENT
if callable(user_agent):
user_agent = user_agent()
headers = {'User-Agent': user_agent}
for h in PROXY_REQUEST_HEADERS:
if h in request.headers:
headers[h] = request.headers[h]
referer_headers = dict(headers)
referer_headers['Referer'] = referer
request_timeout = 30
session = aiohttp_client_session(
auto_decompress=False,
timeout=request_timeout,
)
# 先尝试发带Referer的请求，不行再尝试不带Referer
response = await get_response(session, url, referer_headers)
if response.status in REFERER_DENY_STATUS:
LOG.info(f'proxy image {url} referer={referer} '
f'failed {response.status}, will try without referer')
response.close()
response = await get_response(session, response.url, headers)
is_chunked = response.headers.get('Transfer-Encoding',
'').lower() == 'chunked'
# using chunked encoding is forbidden for HTTP/1.0
if is_chunked and request.version < HttpVersion11:
version = 'HTTP/{0.major}.{0.minor}'.format(request.version)
error_msg = f"using chunked encoding is forbidden for {version}"
LOG.info(
f'proxy image {url} referer={referer} failed: {error_msg}')
response.close()
raise ImageProxyError(error_msg)
except ImageProxyError as ex:
await do_cleanup()
return ex.to_response()
except Exception:
await do_cleanup()
raise
try:
my_response = StreamResponse(status=response.status)
# 'Content-Length', 'Content-Type', 'Transfer-Encoding'
if is_chunked:
my_response.enable_chunked_encoding()
elif response.headers.get('Transfer-Encoding'):
my_response.headers['Transfer-Encoding'] = response.headers[
'Transfer-Encoding']
if response.headers.get('Content-Length'):
content_length = int(response.headers['Content-Length'])
if content_length > MAX_IMAGE_SIZE:
return json_response({'message': 'image too large'},
status=413)
my_response.content_length = content_length
if response.headers.get('Content-Type'):
my_response.content_type = response.headers['Content-Type']
for h in PROXY_RESPONSE_HEADERS:
if h in response.headers:
my_response.headers[h] = response.headers[h]
await my_response.prepare(request)
except Exception:
await do_cleanup()
raise
try:
content_length = 0
async for chunk in response.content.iter_chunked(8 * 1024):
content_length += len(chunk)
if content_length > MAX_IMAGE_SIZE:
LOG.warning(f'image too large, abort the response, url={url}')
my_response.force_close()
break
await my_response.write(chunk)
await my_response.write_eof()
finally:
await do_cleanup()
return my_response
def proxy_image(url):
referer = get_referer_of_url(url)
token = encode_image_url(url, referer)
click.echo(token)