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"""
Description:
    This file is used to make connections
    Include ssh & exchange public-key to each other so that
    it can run without password

    lanqinglong@huawei.com
"""
import os
import time
import pexpect
import re
import sys
from foundation import foundation

class connection( foundation ):

    def __init__( self ):
        foundation.__init__( self )
        self.loginfo = foundation()

    def AddKnownHost( self, handle, ipaddr, username, password ):
        """
        Add an user to known host,so that onos can login in with onos $ipaddr.
        parameters:
        ipaddr:   ip address
        username: login user name
        password: login password
        """
        print( "Now Adding an user to known hosts " + ipaddr )
        login = handle
        login.sendline( "ssh -l %s -p 8101 %s"%( username, ipaddr ) )
        index = 0
        while index != 2:
            index = login.expect( ['assword:', 'yes/no', pexpect.EOF, \
                                   pexpect.TIMEOUT] )
            if index == 0:
                login.sendline( password )
                login.sendline( "logout" )
                index = login.expect( ["closed", pexpect.EOF] )
                if index == 0:
                    self.loginfo.log( "Add SSH Known Host Success!" )
                    break
                else:
                    self.loginfo.log( "Add SSH Known Host Failed! Please Check!" )
                    break
                login.prompt( )

            if index == 1:
                login.sendline('yes')

    def GetEnvValue( self, handle, envname):
        """
        os.getenv only returns current user value
        GetEnvValue returns a environment value of
            current handle
        eg: GetEnvValue(handle,'HOME')
        """
        envhandle = handle
        envhandle.sendline( 'echo $' + envname )
        envhandle.prompt( )
        reg = envname + '\r\n(.*)\r'
        envaluereg = re.compile( reg )
        envalue = envaluereg.search( envhandle.before )
        if envalue:
            return envalue.groups()[0]
        else:
            return None

    def Gensshkey( self, handle ):
        """
        Generate ssh keys, used for some server have no sshkey.
        """
        print "Now Generating SSH keys..."
        #Here file name may be id_rsa or id_ecdsa or others
        #So here will have a judgement
        keysub = handle
        filepath = self.GetEnvValue( keysub, 'HOME' ) + '/.ssh'
        filelist = os.listdir( filepath )
        for item in filelist:
            if 'id' in item:
                self.loginfo.log("SSH keys are exsit in ssh directory.")
                return True
        keysub.sendline("ssh-keygen -t rsa")
        Result = 0
        while Result != 2:
            Result = keysub.expect( ["Overwrite", "Enter", pexpect.EOF, \
                                     'PEXPECT]#', pexpect.TIMEOUT])
            if Result == 0:
                keysub.sendline("y")
            if Result == 1 or Result == 2:
                keysub.sendline("\n")
            if Result == 3:
                self.loginfo.log( "Generate SSH key success." )
                keysub.prompt()
                break
            if Result == 4:
                self.loginfo.log("Generate SSH key failed.")
                keysub.prompt()
                break

    def GetRootAuth( self, password ):
        """
        Get root user
        parameters:
        password: root login password
        """
        print( "Now changing to user root" )
        login = pexpect.spawn( "su - root" )
        index = 0
        while index != 2:
            index = login.expect( ['assword:', "failure", \
                                   pexpect.EOF, pexpect.TIMEOUT] )
            if index == 0:
                login.sendline( password )
            if index == 1:
                self.loginfo.log("Change user to root failed.")

        login.interact()

    def ReleaseRootAuth( self ):
        """
        Exit root user.
        """
        print( "Now Release user root" )
        login = pexpect.spawn( "exit" )
        index = login.expect( ['logout', \
                                pexpect.EOF, pexpect.TIMEOUT] )
        if index == 0:
            self.loginfo.log("Release root user success.")
        if index == 1:
            self.loginfo.log("Release root user failed.")

        login.interact()

    def AddEnvIntoBashrc( self, envalue ):
        """
        Add Env var into /etc/profile.
        parameters:
        envalue: environment value to add
        """
        print "Now Adding bash environment"
        fileopen = open( "/etc/profile", 'r' )
        findContext = 1
        while findContext:
            findContext = fileopen.readline( )
            result = findContext.find( envalue )
            if result != -1:
                break
        fileopen.close
        if result == -1:
            envAdd = open( "/etc/profile", 'a+' )
            envAdd.writelines( "\n" + envalue )
            envAdd.close( )
        self.loginfo.log( "Add env to bashrc success!" )

    def OnosRootPathChange( self, onospath ):
        """
        Change ONOS root path in file:bash_profile
        onospath: path of onos root
        """
        print "Now Changing ONOS Root Path"
        filepath = onospath + '/onos/tools/dev/bash_profile'
        line = open(filepath, 'r').readlines()
        lenall = len(line) - 1
        for i in range(lenall):
           if "export ONOS_ROOT" in line[i]:
               line[i] = 'export ONOS_ROOT=' + onospath + 'onos\n'
        NewFile = open(filepath, 'w')
        NewFile.writelines(line)
        NewFile.close
        print "Done!"

    def OnosConnectionSet (self):
        """
        Intergrate for ONOS connection setup
        """
        if self.masterusername is 'root':
            filepath = '/root/'
        else :
            filepath = '/home/' + self.masterusername + '/'
        self.OnosRootPathChange( filepath )
        filepath = os.path.join( filepath, "onos/tools/dev/bash_profile" )
        self.AddEnvIntoBashrc("source " + filepath + "\n")
        self.AddEnvIntoBashrc("export OCT=" + self.OCT)
        self.AddEnvIntoBashrc("export OC1=" + self.OC1)
        self.AddEnvIntoBashrc("export OC2=" + self.OC2)
        self.AddEnvIntoBashrc("export OC3=" + self.OC3)
        self.AddEnvIntoBashrc("export OCN=" + self.OCN)
        self.AddEnvIntoBashrc("export OCN2=" + self.OCN2)
        self.AddEnvIntoBashrc("export localhost=" + self.localhost)