Add backend providing DBus service

3 files changed, 200 insertions, 0 deletions

diff --git a/backend/magiback b/backend/magiback
new file mode 100755
index 0000000..796ba78
--- /dev/null
+++ b/backend/magiback
@@ -0,0 +1,174 @@
+#!/usr/bin/python3
+
+from gi.repository import GLib
+from pydbus import SystemBus
+import raw_write
+import logging
+import threading
+
+DEAMON_ORG = 'org.mageia.Magiback'
+DEAMON_INTERFACE = DEAMON_ORG
+ISODUMPER_INTERFACE = DEAMON_ORG + ".Isodumper"
+logger = logging.getLogger('magiback.system')
+
+
+class Isodumper(raw_write.Dumper):
+    """
+		<node>
+			<interface name='org.mageia.Magiback.Isodumper'>
+				<method name='do_write'>
+					<arg type='s' name='source' direction='in'/>
+					<arg type='s' name='target' direction='in'/>
+				</method>
+				<method name='do_unmount'>
+					<arg type='s' name='device' direction='in'/>
+					<arg type='b' name='success' direction='out'/>
+					<arg type='s' name='message' direction='out'/>
+				</method>
+				<method name='do_format'>
+					<arg type='s' name='device' direction='in'/>
+					<arg type='s' name='format' direction='in'/>
+					<arg type='b' name='success' direction='out'/>
+					<arg type='s' name='message' direction='out'/>
+				</method>
+				<method name='check_write'>
+					<arg type='s' name='target' direction='in'/>
+					<arg type='s' name='source' direction='in'/>
+				</method>
+				<method name='end'>
+					<arg type='b' name='success' direction='out'/>
+					<arg type='s' name='message' direction='out'/>
+				</method>
+                <property name="done" type="b" access="read"/>
+                <property name="progress" type="i" access="read"/>
+                <property name="message" type="s" access="read"/>
+                <property name="state" type="b" access="read"/>
+			</interface>
+		</node>
+    """
+    def __init__(self):
+        super().__init__()
+        self.finished = threading.Event()
+        self._progress = 0
+        self.loop = GLib.MainLoop()
+        self.return_state = False
+        self.return_message = ""
+        self.authorized_sender_read = set()
+        self.authorized_sender_write = set()
+
+    def do_write(self,source, target):
+        print("Writing")
+        self.finished.clear()
+        self.thread = threading.Thread(target=self._do_write, args=(source, target, ))
+        self.thread.start()
+
+    @property
+    def done(self):
+        return self.finished.wait(1)
+        
+    @property
+    def message(self):
+        return self.return_message
+
+    @property
+    def state(self):
+        return self.return_state
+
+    def end(self):
+        self.thread.join()
+        self._progress = 0
+        self.finished.clear()
+        return self.return_state, self.return_message
+
+    @property
+    def progress(self):
+        return self._progress
+
+    def do_unmount(self, device):
+        print("Unmounting")
+        return self._do_unmount([device])
+
+    def check_write(self,target, source):
+        self.thread = threading.Thread(target=self._check_write, args=(target, source,))
+        self.thread.start()
+        
+    def run(self):
+       self.loop.run()
+
+    def check_permission_write(self, sender):
+        """ Check for senders permission to update system packages"""
+        if sender in self.authorized_sender_write:
+            return
+        else:
+            if self._check_permission(sender, 'org.baseurl.DnfSystem.write'):
+                self.authorized_sender_write.add(sender)
+
+    def _check_permission(self, sender, action):
+        """ Check senders permissions using PolicyKit1
+        """
+        if not sender:
+            raise ValueError('sender == None')
+
+        obj = SystemBus().get(
+            'org.freedesktop.PolicyKit1',
+            '/org/freedesktop/PolicyKit1/Authority')
+        iface = obj['org.freedesktop.PolicyKit1.Authority']
+        (granted, _, details) = iface.CheckAuthorization(
+            ('system-bus-name', {'name': sender}), action, {},
+            1, '', timeout=600)
+        if not granted:
+            return False
+        else:
+            return True
+
+  
+class ConfFile(object):
+    """
+		<node>
+			<interface name='org.mageia.Magiback'>
+				<method name='setName'>
+					<arg type='s' name='a' direction='in'/>
+				</method>
+				<method name='getFile'>
+					<arg type='s' name='content' direction='out'/>
+				</method>
+				<method name='saveFile'>
+					<arg type='s' name='content' direction='in'/>
+				</method>
+			</interface>
+		</node>
+    """
+    def __init__(self):
+        super().__init__()
+    
+    def setName(self,file_name):
+        self.file_name = file_name
+
+    def getFile(self):
+        with open(self.file_name,'r') as tcf :
+            # read the file
+            content=""
+            while 1:
+                line = tcf.readline()
+                if not line:
+                    break
+                content += line
+        return content
+    
+    def saveFile(self, tc):
+        try:
+            with open(self.file_name,'w') as tcf :
+                tcf.write(tc)
+        except:
+            return False
+        return True
+
+if __name__ == '__main__':
+    print("Running Magiback service.")
+
+    bus = SystemBus()
+    conf_file =  ConfFile()
+    bus.publish(DEAMON_ORG, conf_file,
+        ("Isodumper", Isodumper()))
+    loop = GLib.MainLoop()
+    loop.run()
diff --git a/backend/org.mageia.Magiback.conf b/backend/org.mageia.Magiback.conf
new file mode 100644
index 0000000..af00707
--- /dev/null
+++ b/backend/org.mageia.Magiback.conf
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+    <!-- Only root can become service owner -->
+    <policy user="root">
+        <allow own="org.mageia.Magiback"/>
+        <allow send_destination="org.mageia.Magiback"/>
+        <allow send_interface="org.mageia.Magiback"/>
+    </policy>
+    
+    <!-- Anyone can invoke method -->
+    <policy context="default">
+        <allow send_destination="org.mageia.Magiback"/>
+        <allow send_interface="org.mageia.Magiback"/>
+    </policy>
+    <policy context="default">
+        <allow send_destination="org.mageia.Magiback.Isodumper"/>
+        <allow send_interface="org.mageia.Magiback.Isodumper"/>
+    </policy>
+</busconfig>
diff --git a/backend/org.mageia.magiback.service b/backend/org.mageia.magiback.service
new file mode 100644
index 0000000..4f45720
--- /dev/null
+++ b/backend/org.mageia.magiback.service
@@ -0,0 +1,4 @@
+[D-BUS Service]
+Name=org.mageia.Magiback
+Exec=python3 /home/yves/dev/magiback/magiback
+User=root