Revert "fix: extend RFC1918 LNURL carve-out to the HTTP-views path"

This reverts commit 40dce41.

Going with TLS termination on the dev LNbits instead, so the
RFC1918 carve-out becomes unnecessary. The lnbits-core
`/api/v1/lnurlscan` consumer-side validator applies the same
HTTPS-required rule python-lnurl enforces; carving the producer
side out only got greg's LNURL generated, not redeemed.

helpers.py

@@ -1,9 +1,9 @@
 import ipaddress
-from dataclasses import dataclass
 from urllib.parse import urlparse
 
 from fastapi import Request
 from lnbits.settings import settings
+from lnurl import Lnurl
 from lnurl import encode as lnurl_encode
 from lnurl.helpers import url_encode
 from shortuuid import uuid
@@ -11,18 +11,26 @@ from shortuuid import uuid
 from .models import WithdrawLink
 
 
-@dataclass(frozen=True)
-class _EncodedLnurl:
-    """Minimal duck-typed stand-in for `lnurl.Lnurl` exposing just the
-    `.bech32` and `.url` attributes the callers (views.py, views_api.py,
-    transport_rpcs.py) read. We can't always return a real `Lnurl` —
-    its `__new__` re-runs python-lnurl's HTTPS-required host check on
-    bech32-decode, which rejects RFC1918/loopback HTTP URLs even after
-    we've intentionally encoded one. See #2.
-    """
+def create_lnurl(link: WithdrawLink, req: Request) -> Lnurl:
+    if link.is_unique:
+        usescssv = link.usescsv.split(",")
+        tohash = link.id + link.unique_hash + usescssv[link.number]
+        multihash = uuid(name=tohash)
+        url = req.url_for(
+            "withdraw.api_lnurl_multi_response",
+            unique_hash=link.unique_hash,
+            id_unique_hash=multihash,
+        )
+    else:
+        url = req.url_for("withdraw.api_lnurl_response", unique_hash=link.unique_hash)
 
-    bech32: str
-    url: str
+    try:
+        return lnurl_encode(str(url))
+    except Exception as e:
+        raise ValueError(
+            f"Error creating LNURL with url: `{url!s}`, "
+            "check your webserver proxy configuration."
+        ) from e
 
 
 def _is_private_network_http(url: str) -> bool:
@@ -49,46 +57,17 @@ def _is_private_network_http(url: str) -> bool:
     return ip.is_loopback or ip.is_private
 
 
-def _encode_lnurl(url: str, error_hint: str) -> _EncodedLnurl:
-    """Bech32-encode `url` as an LNURL. LAN-local HTTP URLs (loopback /
-    RFC1918) skip python-lnurl's HTTPS-required host validation via the
-    public `lnurl.helpers.url_encode` helper. Everything else goes
-    through the validated `lnurl_encode` path. See #2.
-    """
-    if _is_private_network_http(url):
-        return _EncodedLnurl(bech32=url_encode(url), url=url)
-
-    try:
-        encoded = lnurl_encode(url)
-    except Exception as e:
-        raise ValueError(
-            f"Error creating LNURL with url: `{url!s}`, {error_hint}"
-        ) from e
-    return _EncodedLnurl(bech32=str(encoded.bech32), url=str(encoded.url))
-
-
-def create_lnurl(link: WithdrawLink, req: Request) -> _EncodedLnurl:
-    if link.is_unique:
-        usescssv = link.usescsv.split(",")
-        tohash = link.id + link.unique_hash + usescssv[link.number]
-        multihash = uuid(name=tohash)
-        url = req.url_for(
-            "withdraw.api_lnurl_multi_response",
-            unique_hash=link.unique_hash,
-            id_unique_hash=multihash,
-        )
-    else:
-        url = req.url_for("withdraw.api_lnurl_response", unique_hash=link.unique_hash)
-
-    return _encode_lnurl(str(url), "check your webserver proxy configuration.")
-
-
-def create_lnurl_from_baseurl(link: WithdrawLink) -> _EncodedLnurl:
+def create_lnurl_from_baseurl(link: WithdrawLink) -> tuple[str, str]:
     """
     Same shape as `create_lnurl`, but composes the callback URL from
     `settings.lnbits_baseurl` instead of a FastAPI `Request`. Used by
     the nostr-transport RPC handlers, which have no HTTP request to
     derive a base URL from.
+
+    Returns `(bech32, url)` — the two fields `_populate_lnurl` writes
+    onto `WithdrawLink.lnurl` / `lnurl_url`. LAN-local HTTP URLs
+    (loopback / RFC1918) skip python-lnurl's HTTPS-required check via
+    the public `lnurl.helpers.url_encode` helper; see #2.
     """
     base = settings.lnbits_baseurl.rstrip("/")
     if link.is_unique:
@@ -99,4 +78,14 @@ def create_lnurl_from_baseurl(link: WithdrawLink) -> _EncodedLnurl:
     else:
         url = f"{base}/withdraw/api/v1/lnurl/{link.unique_hash}"
 
-    return _encode_lnurl(url, "check your `LNBITS_BASEURL` configuration.")
+    if _is_private_network_http(url):
+        return url_encode(url), url
+
+    try:
+        encoded = lnurl_encode(url)
+    except Exception as e:
+        raise ValueError(
+            f"Error creating LNURL with url: `{url!s}`, "
+            "check your `LNBITS_BASEURL` configuration."
+        ) from e
+    return str(encoded.bech32), str(encoded.url)