feat(easel): add api provider

gallery/easel/route/view/common/utils/template.py

@@ -1,15 +1,19 @@
 import datetime
+import typing
 from pathlib import Path
 
 from babel.dates import format_date
 from fastapi import Request
 from fastapi.templating import Jinja2Templates
 
+from gallery.easel.core import AppRequest
 from gallery.version import __version__
 
 from ...translation import _
 from .tag import TagUtil
 
+ContextProcessor = typing.Callable[[AppRequest], dict[str, typing.Any]]
+
 
 def is_widget(request: Request) -> bool:
     return (request.url.hostname and request.url.hostname.startswith("weather")) or (
@@ -17,17 +21,23 @@ def is_widget(request: Request) -> bool:
     )
 
 
-def context_processor(request: Request) -> dict:
+def base_context_processor(request: Request) -> dict:
     return {
         "is_widget": is_widget(request),
+        "provider": request.query_params.get("provider"),
     }
 
 
-def build_templates(templates_dir: Path | None = None, filters: dict | None = None) -> Jinja2Templates:
+def build_templates(
+    templates_dir: Path | None = None, filters: dict | None = None, context_processor: ContextProcessor | None = None
+) -> Jinja2Templates:
     directory = [Path(__file__).parent.parent / "templates"]
     if templates_dir:
         directory.append(templates_dir)
-    templates = Jinja2Templates(directory=directory, context_processors=[context_processor])
+    context_processors: list[ContextProcessor] = [base_context_processor]
+    if context_processor:
+        context_processors.append(context_processor)
+    templates = Jinja2Templates(directory=directory, context_processors=context_processors)
     templates.env.globals.update(
         {
             "_": _,