[feature] Discover webfinger through host-meta (#1588)

* [feature] Discover webfinger through host-meta

This implements a fallback for discovering the webfinger endpoint in
case the /.well-known/webfinger endpoint wasn't properly redirected.
Some instances do this because the recommendation used to be to use
host-meta for the webfinger redirect in the before times.

Closes #1558.

* [bug] Ensure we only ever update cache on success

* [chore] Move finger tests to their own place

This adds a test suite for transport and moves the finger cache tests
into there instead of abusing the search test suite.

* [chore] cleanup the test a bit more

We don't really need a separate function for the oddly located webfinger
response as we check the full URL string anyway

* Address review comments

* [chore] update config example

* [chore] access DB only through state in controller

1 files changed, 4 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index a7a36eebf..f7a59d760 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -207,6 +207,10 @@ type GTSCacheConfiguration struct {
 	UserMaxSize   int           `name:"user-max-size"`
 	UserTTL       time.Duration `name:"user-ttl"`
 	UserSweepFreq time.Duration `name:"user-sweep-freq"`
+
+	WebfingerMaxSize   int           `name:"webfinger-max-size"`
+	WebfingerTTL       time.Duration `name:"webfinger-ttl"`
+	WebfingerSweepFreq time.Duration `name:"webfinger-sweep-freq"`
 }
 
 // MarshalMap will marshal current Configuration into a map structure (useful for JSON/TOML/YAML).