Initial AMPB scaffold

ampbrowser/routing.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+from urllib.parse import urlparse
+
+
+@dataclass(frozen=True)
+class Route:
+    original: str
+    normalized: str
+    transport: str
+    profile: str
+    reason: str
+
+
+def route_url(raw_url: str) -> Route:
+    normalized = _normalize_url(raw_url)
+    parsed = urlparse(normalized)
+    scheme = parsed.scheme.lower()
+    host = (parsed.hostname or "").lower()
+
+    if scheme == "gemini":
+        return Route(raw_url, normalized, "gemini", "gemini", "gemini scheme")
+    if scheme in {"rns", "lxmf", "nomad"}:
+        return Route(raw_url, normalized, "reticulum", "reticulum", f"{scheme} scheme")
+    if host.endswith(".onion"):
+        return Route(raw_url, normalized, "tor", "tor", ".onion host")
+    if host.endswith(".i2p"):
+        return Route(raw_url, normalized, "i2p", "i2p", ".i2p host")
+    if scheme in {"http", "https"}:
+        return Route(raw_url, normalized, "clearnet", "clearnet", "http(s) URL")
+    return Route(raw_url, normalized, "unknown", "unknown", "no route rule matched")
+
+
+def _normalize_url(raw_url: str) -> str:
+    value = raw_url.strip()
+    if "://" not in value and not value.startswith(("rns:", "lxmf:")):
+        value = "https://" + value
+    return value