Make it possible to test the federation locally

And explain how to do it in the README

src/activity_pub/actor.rs

@@ -1,7 +1,8 @@
 use diesel::PgConnection;
 use reqwest::Client;
 
-use activity_pub::{activity_pub, ActivityPub, context};
+use BASE_URL;
+use activity_pub::{activity_pub, ActivityPub, context, ap_url};
 use activity_pub::activity::Activity;
 use models::instance::Instance;
 
@@ -40,7 +41,7 @@ pub trait Actor: Sized {
             "summary": "",
             "url": self.compute_id(conn),
             "endpoints": {
-                "sharedInbox": "https://plu.me/inbox"
+                "sharedInbox": ap_url(format!("{}/inbox", BASE_URL.as_str()))
             }
         }))
     }
@@ -58,12 +59,12 @@ pub trait Actor: Sized {
     }
 
     fn compute_id(&self, conn: &PgConnection) -> String {
-        format!(
-            "https://{instance}/{prefix}/{user}",
+        ap_url(format!(
+            "{instance}/{prefix}/{user}",
             instance = self.get_instance(conn).public_domain,
             prefix = Self::get_box_prefix(),
             user = self.get_actor_id()
-        )
+        ))
     }
 
     fn send_to_inbox(&self, conn: &PgConnection, act: Activity) {

src/activity_pub/mod.rs

@@ -16,6 +16,17 @@ pub type ActivityPub = Content<Json>;
 pub const CONTEXT_URL: &'static str = "https://www.w3.org/ns/activitystreams";
 pub const PUBLIC_VISIBILTY: &'static str = "https://www.w3.org/ns/activitystreams#Public";
 
+#[cfg(debug_assertions)]
+pub fn ap_url(url: String) -> String {
+    format!("http://{}", url)
+}
+
+#[cfg(not(debug_assertions))]
+pub fn ap_url(url: String) -> String {
+    format!("https://{}", url)
+}
+
+
 pub fn context() -> serde_json::Value {
     json!([
         CONTEXT_URL,

src/activity_pub/webfinger.rs

@@ -4,6 +4,8 @@ use reqwest::header::{Accept, qitem};
 use reqwest::mime::Mime;
 use serde_json;
 
+use activity_pub::ap_url;
+
 pub trait Webfinger {
     fn webfinger_subject(&self, conn: &PgConnection) -> String;
     fn webfinger_aliases(&self, conn: &PgConnection) -> Vec<String>;
@@ -26,7 +28,7 @@ pub trait Webfinger {
 
 pub fn resolve(acct: String) -> Result<String, String> {
     let instance = acct.split("@").last().unwrap();
-    let url = format!("https://{}/.well-known/webfinger?resource=acct:{}", instance, acct);
+    let url = ap_url(format!("{}/.well-known/webfinger?resource=acct:{}", instance, acct));
     Client::new()
         .get(&url[..])
         .header(Accept(vec![qitem("application/jrd+json".parse::<Mime>().unwrap())]))