feat(file utils): Add `filepaths.nim`

src/status_node_manager/filepaths.nim

@@ -0,0 +1,51 @@
+# TODO: consider importing utils of this file from nimbus-eth2
+
+{.push raises: [].}
+
+import chronicles
+import stew/io2
+
+when defined(windows):
+  import stew/[windows/acl]
+
+type
+  ByteChar = byte | char
+
+proc secureCreatePath*(path: string): IoResult[void] =
+  when defined(windows):
+    let sres = createFoldersUserOnlySecurityDescriptor()
+    if sres.isErr():
+      error "Could not allocate security descriptor", path = path,
+            errorMsg = ioErrorMsg(sres.error), errorCode = $sres.error
+      err(sres.error)
+    else:
+      var sd = sres.get()
+      createPath(path, 0o700, secDescriptor = sd.getDescriptor())
+  else:
+    createPath(path, 0o700)
+
+proc secureWriteFile*[T: ByteChar](path: string,
+                                   data: openArray[T]): IoResult[void] =
+  when defined(windows):
+    let sres = createFilesUserOnlySecurityDescriptor()
+    if sres.isErr():
+      error "Could not allocate security descriptor", path = path,
+            errorMsg = ioErrorMsg(sres.error), errorCode = $sres.error
+      err(sres.error())
+    else:
+      var sd = sres.get()
+      let res = writeFile(path, data, 0o600, sd.getDescriptor())
+      if res.isErr():
+        # writeFile() will not attempt to remove file on failure
+        discard removeFile(path)
+        err(res.error())
+      else:
+        ok()
+  else:
+    let res = writeFile(path, data, 0o600)
+    if res.isErr():
+      # writeFile() will not attempt to remove file on failure
+      discard removeFile(path)
+      err(res.error())
+    else:
+      ok()