Update 2025-04-13_16:27:10
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216
venv/lib/python3.11/site-packages/starlette/templating.py
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216
venv/lib/python3.11/site-packages/starlette/templating.py
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from __future__ import annotations
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import typing
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import warnings
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from os import PathLike
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from starlette.background import BackgroundTask
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from starlette.datastructures import URL
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from starlette.requests import Request
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from starlette.responses import HTMLResponse
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from starlette.types import Receive, Scope, Send
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try:
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import jinja2
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# @contextfunction was renamed to @pass_context in Jinja 3.0, and was removed in 3.1
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# hence we try to get pass_context (most installs will be >=3.1)
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# and fall back to contextfunction,
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# adding a type ignore for mypy to let us access an attribute that may not exist
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if hasattr(jinja2, "pass_context"):
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pass_context = jinja2.pass_context
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else: # pragma: no cover
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pass_context = jinja2.contextfunction # type: ignore[attr-defined]
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except ModuleNotFoundError: # pragma: no cover
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jinja2 = None # type: ignore[assignment]
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class _TemplateResponse(HTMLResponse):
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def __init__(
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self,
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template: typing.Any,
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context: dict[str, typing.Any],
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status_code: int = 200,
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headers: typing.Mapping[str, str] | None = None,
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media_type: str | None = None,
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background: BackgroundTask | None = None,
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):
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self.template = template
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self.context = context
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content = template.render(context)
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super().__init__(content, status_code, headers, media_type, background)
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async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
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request = self.context.get("request", {})
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extensions = request.get("extensions", {})
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if "http.response.debug" in extensions: # pragma: no branch
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await send(
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{
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"type": "http.response.debug",
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"info": {
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"template": self.template,
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"context": self.context,
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},
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}
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)
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await super().__call__(scope, receive, send)
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class Jinja2Templates:
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"""
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templates = Jinja2Templates("templates")
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return templates.TemplateResponse("index.html", {"request": request})
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"""
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@typing.overload
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def __init__(
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self,
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directory: str | PathLike[str] | typing.Sequence[str | PathLike[str]],
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*,
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context_processors: list[typing.Callable[[Request], dict[str, typing.Any]]] | None = None,
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**env_options: typing.Any,
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) -> None: ...
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@typing.overload
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def __init__(
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self,
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*,
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env: jinja2.Environment,
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context_processors: list[typing.Callable[[Request], dict[str, typing.Any]]] | None = None,
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) -> None: ...
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def __init__(
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self,
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directory: str | PathLike[str] | typing.Sequence[str | PathLike[str]] | None = None,
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*,
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context_processors: list[typing.Callable[[Request], dict[str, typing.Any]]] | None = None,
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env: jinja2.Environment | None = None,
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**env_options: typing.Any,
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) -> None:
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if env_options:
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warnings.warn(
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"Extra environment options are deprecated. Use a preconfigured jinja2.Environment instead.",
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DeprecationWarning,
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)
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assert jinja2 is not None, "jinja2 must be installed to use Jinja2Templates"
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assert bool(directory) ^ bool(env), "either 'directory' or 'env' arguments must be passed"
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self.context_processors = context_processors or []
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if directory is not None:
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self.env = self._create_env(directory, **env_options)
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elif env is not None: # pragma: no branch
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self.env = env
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self._setup_env_defaults(self.env)
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def _create_env(
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self,
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directory: str | PathLike[str] | typing.Sequence[str | PathLike[str]],
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**env_options: typing.Any,
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) -> jinja2.Environment:
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loader = jinja2.FileSystemLoader(directory)
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env_options.setdefault("loader", loader)
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env_options.setdefault("autoescape", True)
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return jinja2.Environment(**env_options)
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def _setup_env_defaults(self, env: jinja2.Environment) -> None:
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@pass_context
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def url_for(
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context: dict[str, typing.Any],
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name: str,
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/,
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**path_params: typing.Any,
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) -> URL:
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request: Request = context["request"]
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return request.url_for(name, **path_params)
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env.globals.setdefault("url_for", url_for)
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def get_template(self, name: str) -> jinja2.Template:
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return self.env.get_template(name)
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@typing.overload
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def TemplateResponse(
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self,
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request: Request,
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name: str,
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context: dict[str, typing.Any] | None = None,
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status_code: int = 200,
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headers: typing.Mapping[str, str] | None = None,
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media_type: str | None = None,
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background: BackgroundTask | None = None,
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) -> _TemplateResponse: ...
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@typing.overload
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def TemplateResponse(
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self,
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name: str,
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context: dict[str, typing.Any] | None = None,
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status_code: int = 200,
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headers: typing.Mapping[str, str] | None = None,
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media_type: str | None = None,
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background: BackgroundTask | None = None,
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) -> _TemplateResponse:
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# Deprecated usage
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...
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def TemplateResponse(self, *args: typing.Any, **kwargs: typing.Any) -> _TemplateResponse:
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if args:
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if isinstance(args[0], str): # the first argument is template name (old style)
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warnings.warn(
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"The `name` is not the first parameter anymore. "
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"The first parameter should be the `Request` instance.\n"
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'Replace `TemplateResponse(name, {"request": request})` by `TemplateResponse(request, name)`.',
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DeprecationWarning,
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)
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name = args[0]
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context = args[1] if len(args) > 1 else kwargs.get("context", {})
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status_code = args[2] if len(args) > 2 else kwargs.get("status_code", 200)
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headers = args[2] if len(args) > 2 else kwargs.get("headers")
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media_type = args[3] if len(args) > 3 else kwargs.get("media_type")
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background = args[4] if len(args) > 4 else kwargs.get("background")
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if "request" not in context:
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raise ValueError('context must include a "request" key')
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request = context["request"]
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else: # the first argument is a request instance (new style)
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request = args[0]
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name = args[1] if len(args) > 1 else kwargs["name"]
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context = args[2] if len(args) > 2 else kwargs.get("context", {})
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status_code = args[3] if len(args) > 3 else kwargs.get("status_code", 200)
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headers = args[4] if len(args) > 4 else kwargs.get("headers")
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media_type = args[5] if len(args) > 5 else kwargs.get("media_type")
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background = args[6] if len(args) > 6 else kwargs.get("background")
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else: # all arguments are kwargs
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if "request" not in kwargs:
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warnings.warn(
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"The `TemplateResponse` now requires the `request` argument.\n"
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'Replace `TemplateResponse(name, {"context": context})` by `TemplateResponse(request, name)`.',
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DeprecationWarning,
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)
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if "request" not in kwargs.get("context", {}):
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raise ValueError('context must include a "request" key')
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context = kwargs.get("context", {})
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request = kwargs.get("request", context.get("request"))
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name = typing.cast(str, kwargs["name"])
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status_code = kwargs.get("status_code", 200)
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headers = kwargs.get("headers")
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media_type = kwargs.get("media_type")
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background = kwargs.get("background")
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context.setdefault("request", request)
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for context_processor in self.context_processors:
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context.update(context_processor(request))
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template = self.get_template(name)
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return _TemplateResponse(
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template,
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context,
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status_code=status_code,
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headers=headers,
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media_type=media_type,
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background=background,
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)
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