feat: add plaintext source parser plugin

src/proxy_pool/plugins/builtin/parsers/plaintext.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+import re
+from typing import Any
+
+from proxy_pool.config import Settings
+from proxy_pool.plugins.protocols import DiscoveredProxy
+
+_LINE_RE = re.compile(r"^(\d{1,3}(?:\.\d{1,3}){3}):(\d{2,5})$")
+
+
+class PlaintextParser:
+    name = "plaintext"
+
+    def supports(self, url: str) -> bool:
+        return url.endswith(".txt") or "plain" in url.lower()
+
+    async def parse(
+        self,
+        raw: bytes,
+        source_url: str,
+        source_id: Any,
+        default_protocol: str,
+    ) -> list[DiscoveredProxy]:
+        results: list[DiscoveredProxy] = []
+        text = raw.decode("utf-8", errors="ignore")
+
+        for line in text.splitlines():
+            match = _LINE_RE.match(line.strip())
+            if match:
+                results.append(
+                    DiscoveredProxy(
+                        ip=match.group(1),
+                        port=int(match.group(2)),
+                        protocol=default_protocol,
+                        source_id=source_id,
+                    )
+                )
+
+        return results
+
+    def default_schedule(self) -> str | None:
+        return "*/30 * * * *"
+
+
+def create_plugin(settings: Settings) -> PlaintextParser:
+    return PlaintextParser()