first commit

go.mod

@@ -0,0 +1,3 @@
+module git.zio.sh/astra/gearheads-webfinger
+
+go 1.21.1

main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+var redirects map[string][]string
+
+func HandleWebfinger(w http.ResponseWriter, req *http.Request) {
+	olduser := req.URL.Query().Get("resource")[5:]
+	newuser, ok := redirects[olduser]
+	if !ok {
+		w.WriteHeader(404)
+		return
+	}
+
+	s := `{
+    "subject": "acct:%[1]s@%[2]s",
+    "aliases": [
+        "https://%[2]s/@%[1]s",
+        "https://%[2]s/users/%[1]s"
+    ],
+    "links": [
+        {
+            "rel": "http://webfinger.net/rel/profile-page",
+            "type": "text/html",
+            "href": "https://%[2]s/@%[1]s"
+        },
+        {
+            "rel": "self",
+            "type": "application/activity+json",
+            "href": "https://%[2]s/users/%[1]s"
+        }
+    ]
+}`
+	w.Header().Set("Content-Type", "application/json")
+	fmt.Fprintln(w, fmt.Sprintf(s, newuser[0], newuser[1]))
+}
+
+func main() {
+	redirects = make(map[string][]string)
+	redirects["ducky@gearheads.social"] = []string{"ducky", "ap.zio.sh"}
+	redirects["astra@gearheads.social"] = []string{"astra", "ap.zio.sh"}
+
+	http.HandleFunc("/.well-known/webfinger", HandleWebfinger)
+	http.ListenAndServe(":8888", nil)
+}