lib.ec.Curl: Add class

Add class Curl as the first pure FileTransfer class without _run()
/ _sudo(). It doesn't use any PycURL / libcurl-like binding, but runs
the curl binary in a subprocess. That looks the most portable still.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/ec/Curl.py

@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+from urllib.parse import urlparse
+
+from ..FileTransfer import FileTransfer as Base
+from ..base import Result
+
+if TYPE_CHECKING:
+    from ..ExecContext import ExecContext
+
+class Curl(Base):
+
+    def __init__(self, uri: str, *args, ec: ExecContext|None=None, **kwargs) -> None:
+        super().__init__(uri=uri, *args, **kwargs)
+        self.__ec: ExecContext|None = ec
+        if ec is None:
+            from .Local import Local
+            self.__ec = Local(interactive=False, *args, **kwargs)
+        p = urlparse(uri)
+        self.__base_url = f'{p.scheme}://{p.hostname}'
+        if p.port is not None:
+            self.__base_url += f':{p.port}'
+
+    async def _get(
+        self,
+        path: str,
+        wd: str|None,
+        throw: bool,
+        verbose: bool|None,
+        title: str
+    ) -> Result:
+        cmd = ['curl']
+        if verbose is None:
+            verbose = self.__ec.verbose_default
+        if not verbose:
+            cmd.append('-s')
+        cmd.append('--follow')
+        if wd is not None:
+            path = wd + '/' + path
+        if not len(path) or path[0] != '/':
+            path = '/' + path
+        cmd.append(self.__base_url + path)
+        return await self.__ec.run(cmd, throw=throw, verbose=verbose)
+
+    async def _put(
+        self,
+        content: bytes,
+        path: str,
+        wd: str|None,
+        throw: bool,
+        verbose: bool|None,
+        title: str,
+        owner: str|None,
+        group: str|None,
+        mode: str|None,
+    ) -> Result:
+        raise NotImplementedError()