From 1cd8302a4ba6e4553738a1547de37af12a6aa35f Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 6 Sep 2020 00:17:45 +0100
Subject: Add the HideUnknown mapper

This mapper hides inodes for which the user and/or group cannot be mapped to local entries
---
 netfs/fuse/Jamfile.jam         | 23 ++++++++++++++++-------
 netfs/fuse/fuseApp.cpp         | 12 ++++++++++++
 netfs/fuse/fuseMappers.ice     | 12 ++++++++++++
 netfs/fuse/fuseMappersImpl.cpp | 36 ++++++++++++++++++++++++++++++++++++
 netfs/fuse/fuseMappersImpl.h   | 25 +++++++++++++++++++++++++
 5 files changed, 101 insertions(+), 7 deletions(-)
 create mode 100644 netfs/fuse/fuseMappers.ice
 create mode 100644 netfs/fuse/fuseMappersImpl.cpp
 create mode 100644 netfs/fuse/fuseMappersImpl.h

diff --git a/netfs/fuse/Jamfile.jam b/netfs/fuse/Jamfile.jam
index d700c37..4d000be 100644
--- a/netfs/fuse/Jamfile.jam
+++ b/netfs/fuse/Jamfile.jam
@@ -3,20 +3,29 @@ import package ;
 lib Glacier2 : : <name>Glacier2++11 ;
 constant FUSE_VER : 35 ;
 
-obj fuseConfig : fuseConfig.ice :
-	<toolset>tidy:<checker>none
-	<library>../ice//netfs-api
-	<implicit-dependency>../ice//netfs-api
-	<library>..//slicer
-	<include>.
-;
+rule iceobj ( name : ice ) {
+	obj $(name) : $(ice) :
+		<toolset>tidy:<checker>none
+		<library>../ice//netfs-api
+		<implicit-dependency>../ice//netfs-api
+		<library>..//slicer
+		<include>.
+		;
+}
+iceobj fuseConfig : fuseConfig.ice ;
+iceobj fuseMappers : fuseMappers.ice ;
+
 lib netfs-client-configuration :
 	fuseConfig
+	fuseMappers
 	fuseConfig.ice
+	fuseMappers.ice
 	fuseConfigImpl.cpp
+	fuseMappersImpl.cpp
 	:
 	<slicer>pure
 	<library>../ice//netfs-api
+	<library>../lib//netfs-common
 	<implicit-dependency>../ice//netfs-api
 	<implicit-dependency>fuseConfig
 	<library>..//Ice
diff --git a/netfs/fuse/fuseApp.cpp b/netfs/fuse/fuseApp.cpp
index f0576b3..ff1585a 100644
--- a/netfs/fuse/fuseApp.cpp
+++ b/netfs/fuse/fuseApp.cpp
@@ -2,6 +2,7 @@
 #include "cache.impl.h"
 #include "fuseDirs.h"
 #include "fuseFiles.h"
+#include "fuseMappersImpl.h"
 #include "lockHelpers.h"
 #include <Glacier2/Router.h>
 #include <boost/lexical_cast.hpp>
@@ -111,7 +112,18 @@ NetFS::FuseApp::configureFromUri(const std::string & uriString)
 			setting = boost::lexical_cast<std::remove_reference_t<decltype(setting)>>(p->second);
 		}
 	};
+	auto setWith = [&uri](const auto & param, auto & setting, auto && f) {
+		if (auto p = uri.query.find(param); p != uri.query.end()) {
+			setting = f(p->second);
+		}
+	};
 	set("async", r->Async);
+	setWith("mapper", r->mapper, [](auto && m) -> NetFS::Mapping::MapperPtr {
+		if (m == "hide") {
+			return std::make_shared<NetFS::Client::HideUnknownMapperImpl>();
+		}
+		return {};
+	});
 	return r;
 }
 
diff --git a/netfs/fuse/fuseMappers.ice b/netfs/fuse/fuseMappers.ice
new file mode 100644
index 0000000..6945eec
--- /dev/null
+++ b/netfs/fuse/fuseMappers.ice
@@ -0,0 +1,12 @@
+#include <mapper.ice>
+
+["slicer:include:fuseMappersImpl.h"]
+module NetFS {
+	module Client {
+		["slicer:implementation:NetFS.Client.HideUnknownMapperImpl"]
+		local class HideUnknownMapper extends Mapping::Mapper {
+
+		};
+	};
+};
+
diff --git a/netfs/fuse/fuseMappersImpl.cpp b/netfs/fuse/fuseMappersImpl.cpp
new file mode 100644
index 0000000..9a99eca
--- /dev/null
+++ b/netfs/fuse/fuseMappersImpl.cpp
@@ -0,0 +1,36 @@
+#include "fuseMappersImpl.h"
+#include <entCache.h>
+
+namespace NetFS::Client {
+	HideUnknownMapperImpl::HideUnknownMapperImpl() :
+		HideUnknownMapperImpl(std::make_shared<EntCache<User>>(), std::make_shared<EntCache<Group>>())
+	{
+	}
+
+	HideUnknownMapperImpl::HideUnknownMapperImpl(EntryResolverPtr<User> u, EntryResolverPtr<Group> g) :
+		users(std::move(u)), groups(std::move(g))
+	{
+	}
+
+	Mapping::FileSystem
+	HideUnknownMapperImpl::mapTransport(const std::string & un, const std::string & gn)
+	{
+		auto u = users->getEntry(un);
+		auto g = groups->getEntry(gn);
+		if (!u || !g) {
+			return {0, 0, 0xFFFFFFF};
+		}
+		return {static_cast<int>(u->id), static_cast<int>(g->id), 0};
+	}
+
+	Mapping::Transport
+	HideUnknownMapperImpl::mapFileSystem(int uid, int gid)
+	{
+		auto u = users->getEntry(uid);
+		auto g = groups->getEntry(gid);
+		if (!u || !g) {
+			throw NetFS::SystemError(EPERM);
+		}
+		return {u->name, g->name, 0};
+	}
+}
diff --git a/netfs/fuse/fuseMappersImpl.h b/netfs/fuse/fuseMappersImpl.h
new file mode 100644
index 0000000..4b0677f
--- /dev/null
+++ b/netfs/fuse/fuseMappersImpl.h
@@ -0,0 +1,25 @@
+#ifndef NETFS_MAPPING_CLIENTIMPL_H
+#define NETFS_MAPPING_CLIENTIMPL_H
+
+#include "entries.h"
+#include "entryResolver.h"
+#include <fuseMappers.h>
+
+namespace NetFS {
+	namespace Client {
+		class HideUnknownMapperImpl : public HideUnknownMapper {
+		public:
+			HideUnknownMapperImpl();
+			HideUnknownMapperImpl(EntryResolverPtr<User> u, EntryResolverPtr<Group> g);
+
+			Mapping::Transport mapFileSystem(int uid, int gid) override;
+			Mapping::FileSystem mapTransport(const std::string & un, const std::string & gn) override;
+
+		protected:
+			EntryResolverPtr<User> users;
+			EntryResolverPtr<Group> groups;
+		};
+	}
+}
+
+#endif
-- 
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