Feature Flags: Generically deal with HTTP-based feature flags.

* Define a default `FEATURE_FLAGS_HTTP` configuration variable that's
  an empty list to help defining http-based feature flags that can be
  used to turn on/off features
* Build macro to include hidden fields for feature flags where
  necessary.
* Extend flask's `url_for` function to deal with defined feature flags
  in a mostly transparent way

1 files changed, 9 insertions, 3 deletions

diff --git a/uploader/__init__.py b/uploader/__init__.py
index b7f0ab9..7425b38 100644
--- a/uploader/__init__.py
+++ b/uploader/__init__.py
@@ -22,6 +22,7 @@ from .files.views import files
 from .species import speciesbp
 from .publications import pubbp
 from .oauth2.views import oauth2
+from .flask_extensions import url_for
 from .expression_data import exprdatabp
 from .errors import register_error_handlers
 from .background_jobs import background_jobs_bp
@@ -109,17 +110,22 @@ def create_app(config: Optional[dict] = None):
     setup_logging(app)
     setup_modules_logging(app.logger, (
         "uploader.base_routes",
+        "uploader.flask_extensions",
         "uploader.publications.models",
         "uploader.publications.datatables",
         "uploader.phenotypes.models"))
 
     # setup jinja2 symbols
-    app.add_template_global(lambda : request.url, name="request_url")
+    app.add_template_global(user_logged_in)
+    app.add_template_global(url_for, name="url_for")
     app.add_template_global(authserver_authorise_uri)
+    app.add_template_global(lambda : request.url, name="request_url")
     app.add_template_global(lambda: app.config["GN2_SERVER_URL"],
                             name="gn2server_uri")
-    app.add_template_global(user_logged_in)
-    app.add_template_global(lambda : session.user_details()["email"], name="user_email")
+    app.add_template_global(lambda : session.user_details()["email"],
+                            name="user_email")
+    app.add_template_global(lambda: app.config["FEATURE_FLAGS_HTTP"],
+                            name="http_feature_flags")
 
     Session(app)