[feature] add instance-expose-public-timeline flag (#1039)

* Add instance-expose-public-timeline flag

Adds a config flag that allows unauthenticated access to /api/v1/timelines/public. Defaults to false to replicate existing behaviour.

* Update structure following review

* Add comment

* Fix linting

2 files changed, 26 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index 907f250b0..ecbd079e6 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -71,6 +71,7 @@ type Configuration struct {
 
 	InstanceExposePeers            bool `name:"instance-expose-peers" usage:"Allow unauthenticated users to query /api/v1/instance/peers?filter=open"`
 	InstanceExposeSuspended        bool `name:"instance-expose-suspended" usage:"Expose suspended instances via web UI, and allow unauthenticated users to query /api/v1/instance/peers?filter=suspended"`
+	InstanceExposePublicTimeline   bool `name:"instance-expose-public-timeline" usage:"Allow unauthenticated users to query /api/v1/timelines/public"`
 	InstanceDeliverToSharedInboxes bool `name:"instance-deliver-to-shared-inboxes" usage:"Deliver federated messages to shared inboxes, if they're available."`
 
 	AccountsRegistrationOpen bool `name:"accounts-registration-open" usage:"Allow anyone to submit an account signup request. If false, server will be invite-only."`
diff --git a/internal/config/helpers.gen.go b/internal/config/helpers.gen.go
index 1947fdadf..2786f5b5a 100644
--- a/internal/config/helpers.gen.go
+++ b/internal/config/helpers.gen.go
@@ -620,6 +620,31 @@ func GetInstanceExposeSuspended() bool { return global.GetInstanceExposeSuspende
 // SetInstanceExposeSuspended safely sets the value for global configuration 'InstanceExposeSuspended' field
 func SetInstanceExposeSuspended(v bool) { global.SetInstanceExposeSuspended(v) }
 
+// GetInstanceExposePublicTimeline safely fetches the Configuration value for state's 'InstanceExposePublicTimeline' field
+func (st *ConfigState) GetInstanceExposePublicTimeline() (v bool) {
+	st.mutex.Lock()
+	v = st.config.InstanceExposePublicTimeline
+	st.mutex.Unlock()
+	return
+}
+
+// SetInstanceExposePublicTimeline safely sets the Configuration value for state's 'InstanceExposePublicTimeline' field
+func (st *ConfigState) SetInstanceExposePublicTimeline(v bool) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.InstanceExposePublicTimeline = v
+	st.reloadToViper()
+}
+
+// InstanceExposePublicTimelineFlag returns the flag name for the 'InstanceExposePublicTimeline' field
+func InstanceExposePublicTimelineFlag() string { return "instance-expose-public-timeline" }
+
+// GetInstanceExposePublicTimeline safely fetches the value for global configuration 'InstanceExposePublicTimeline' field
+func GetInstanceExposePublicTimeline() bool { return global.GetInstanceExposePublicTimeline() }
+
+// SetInstanceExposePublicTimeline safely sets the value for global configuration 'InstanceExposePublicTimeline' field
+func SetInstanceExposePublicTimeline(v bool) { global.SetInstanceExposePublicTimeline(v) }
+
 // GetInstanceDeliverToSharedInboxes safely fetches the Configuration value for state's 'InstanceDeliverToSharedInboxes' field
 func (st *ConfigState) GetInstanceDeliverToSharedInboxes() (v bool) {
 	st.mutex.Lock()