feat: switch from Quart to FastAPI part I

lnbits/jinja2_templating.py

@@ -0,0 +1,36 @@
+# Borrowed from the excellent accent-starlette 
+# https://github.com/accent-starlette/starlette-core/blob/master/starlette_core/templating.py
+
+import typing
+
+from starlette import templating
+from starlette.datastructures import QueryParams
+
+from lnbits.requestvars import g
+
+try:
+    import jinja2
+except ImportError:  # pragma: nocover
+    jinja2 = None  # type: ignore
+
+
+class Jinja2Templates(templating.Jinja2Templates):
+    def __init__(self, loader: jinja2.BaseLoader) -> None:
+        assert jinja2 is not None, "jinja2 must be installed to use Jinja2Templates"
+        self.env = self.get_environment(loader)
+
+    def get_environment(self, loader: "jinja2.BaseLoader") -> "jinja2.Environment":
+        @jinja2.contextfunction
+        def url_for(context: dict, name: str, **path_params: typing.Any) -> str:
+            request = context["request"]
+            return request.url_for(name, **path_params)
+
+        def url_params_update(init: QueryParams, **new: typing.Any) -> QueryParams:
+            values = dict(init)
+            values.update(new)
+            return QueryParams(**values)
+
+        env = jinja2.Environment(loader=loader, autoescape=True)
+        env.globals["url_for"] = url_for
+        env.globals["url_params_update"] = url_params_update
+        return env