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# iSCSI configuration dialog
#
# Copyright (C) 2013  Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.  You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#

from collections import namedtuple
from dasbus.typing import unwrap_variant

from pyanaconda.modules.common.errors.configuration import StorageDiscoveryError
from pyanaconda.modules.common.task import async_run_task
from pyanaconda.modules.common.structures.iscsi import Credentials, Portal, Node
from pyanaconda.modules.common.constants.services import STORAGE
from pyanaconda.modules.common.constants.objects import ISCSI
from pyanaconda.core.constants import ISCSI_INTERFACE_UNSET, ISCSI_INTERFACE_DEFAULT, \
    ISCSI_INTERFACE_IFACENAME
from pyanaconda.ui.gui import GUIObject
from pyanaconda.ui.gui.utils import escape_markup
from pyanaconda.ui.lib.storage import try_populate_devicetree
from pyanaconda.core.i18n import _
from pyanaconda.core.regexes import ISCSI_IQN_NAME_REGEX, ISCSI_EUI_NAME_REGEX
from pyanaconda.network import check_ip_address

__all__ = ["ISCSIDialog"]

STYLE_NONE = 0
STYLE_CHAP = 1
STYLE_REVERSE_CHAP = 2

NodeStoreRow = namedtuple("NodeStoreRow", ["selected", "notLoggedIn", "name", "iface", "portal"])


class ISCSIDialog(GUIObject):
    """
       .. inheritance-diagram:: ISCSIDialog
          :parts: 3
    """
    builderObjects = ["iscsiDialog", "nodeStore", "nodeStoreFiltered"]
    mainWidgetName = "iscsiDialog"
    uiFile = "spokes/advstorage/iscsi.glade"

    def __init__(self, data):
        super().__init__(data)
        self._discovered_nodes = []
        self._update_devicetree = False

        self._authTypeCombo = self.builder.get_object("authTypeCombo")
        self._authNotebook = self.builder.get_object("authNotebook")
        self._iscsiNotebook = self.builder.get_object("iscsiNotebook")
        self._loginButton = self.builder.get_object("loginButton")
        self._retryLoginButton = self.builder.get_object("retryLoginButton")
        self._loginAuthTypeCombo = self.builder.get_object("loginAuthTypeCombo")
        self._loginAuthNotebook = self.builder.get_object("loginAuthNotebook")
        self._loginGrid = self.builder.get_object("loginGrid")
        self._loginConditionNotebook = self.builder.get_object("loginConditionNotebook")
        self._configureGrid = self.builder.get_object("configureGrid")
        self._conditionNotebook = self.builder.get_object("conditionNotebook")
        self._bindCheckbox = self.builder.get_object("bindCheckbutton")
        self._startButton = self.builder.get_object("startButton")
        self._okButton = self.builder.get_object("okButton")
        self._cancelButton = self.builder.get_object("cancelButton")
        self._retryButton = self.builder.get_object("retryButton")
        self._initiatorEntry = self.builder.get_object("initiatorEntry")
        self._store = self.builder.get_object("nodeStore")
        self._storeFilter = self.builder.get_object("nodeStoreFiltered")
        self._discoverySpinner = self.builder.get_object("waitSpinner")
        self._discoveryErrorLabel = self.builder.get_object("discoveryErrorLabel")
        self._discoveredLabel = self.builder.get_object("discoveredLabel")
        self._loginSpinner = self.builder.get_object("loginSpinner")
        self._loginErrorLabel = self.builder.get_object("loginErrorLabel")

        self._iscsi_module = STORAGE.get_proxy(ISCSI)

    def refresh(self):
        self._bindCheckbox.set_active(
            self._iscsi_module.GetInterfaceMode() == ISCSI_INTERFACE_IFACENAME
        )
        self._bindCheckbox.set_sensitive(self._mode_change_is_allowed())
        self._authTypeCombo.set_active(0)
        self._startButton.set_sensitive(True)
        self._loginAuthTypeCombo.set_active(0)
        self._storeFilter.set_visible_column(1)
        self._initiatorEntry.set_text(self._iscsi_module.Initiator)
        self._initiatorEntry.set_sensitive(self._iscsi_module.CanSetInitiator())

    def _mode_change_is_allowed(self):
        return self._iscsi_module.GetInterfaceMode() == ISCSI_INTERFACE_UNSET

    def run(self):
        rc = self.window.run()
        self.window.destroy()

        if self._update_devicetree:
            try_populate_devicetree()

        return rc

    ##
    ## DISCOVERY
    ##

    def on_auth_type_changed(self, widget, *args):
        """Validate the credentials.

        When we change the notebook, we also need to reverify the credentials
        in order to set the Start button sensitivity.
        """
        self._authNotebook.set_current_page(widget.get_active())
        self.on_discover_field_changed()

    def on_discover_field_changed(self, *args):
        """Validate the discover fields.

        When the initiator name, ip address, and any auth fields are filled in
        valid, only then should the Start button be made sensitive.
        """
        style = self._authNotebook.get_current_page()
        portal = self._get_portal()
        credentials = self._get_discover_credentials(style)

        initiator = self._get_text("initiatorEntry")
        self._startButton.set_sensitive(
            self._is_portal_valid(portal)
            and self._is_initiator_valid(initiator)
            and self._are_credentials_valid(style, credentials)
        )

    def on_start_clicked(self, *args):
        """Start the discovery task."""
        # First update widgets.
        self._startButton.hide()
        self._cancelButton.set_sensitive(False)
        self._okButton.set_sensitive(False)
        self._conditionNotebook.set_current_page(1)
        self._set_configure_sensitive(False)
        self._initiatorEntry.set_sensitive(False)

        # Get the node discovery credentials.
        style = self._authNotebook.get_current_page()
        portal = self._get_portal()
        credentials = self._get_discover_credentials(style)
        initiator = self._get_text("initiatorEntry")

        self._discoveredLabel.set_markup(_(
            "The following nodes were discovered using the iSCSI initiator "
            "<b>%(initiatorName)s</b> using the portal IP address "
            "<b>%(portalAddress)s</b>.  Please select which nodes you "
            "wish to log into:") %
            {
                "initiatorName": escape_markup(initiator),
                "portalAddress": escape_markup(portal.ip_address)
            }
        )

        # Get the discovery task.
        if self._bindCheckbox.get_active():
            interfaces_mode = ISCSI_INTERFACE_IFACENAME
        else:
            interfaces_mode = ISCSI_INTERFACE_DEFAULT
        task_path = self._iscsi_module.DiscoverWithTask(
            Portal.to_structure(portal),
            Credentials.to_structure(credentials),
            interfaces_mode
        )
        task_proxy = STORAGE.get_proxy(task_path)

        if self._iscsi_module.CanSetInitiator():
            self._iscsi_module.SetInitiator(initiator)

        # Start the discovery.
        async_run_task(task_proxy, self.process_discovery_result)

        self._discoverySpinner.start()

    def process_discovery_result(self, task_proxy):
        """Process the result of the task.

        :param task_proxy: a task
        """
        # Stop the spinner.
        self._discoverySpinner.stop()
        self._cancelButton.set_sensitive(True)

        try:
            # Finish the task
            task_proxy.Finish()
        except StorageDiscoveryError as e:
            # Discovery has failed, show the error.
            self._set_configure_sensitive(True)
            self._discoveryErrorLabel.set_text(str(e))
            self._conditionNotebook.set_current_page(2)
        else:
            nodes = unwrap_variant(task_proxy.GetResult())
            # Discovery succeeded.
            # Populate the node store.
            self._discovered_nodes = Node.from_structure_list(nodes)

            for node in self._discovered_nodes:
                portal = "%s:%s" % (node.address, node.port)
                self._store.append([False, True, node.name, node.net_ifacename, portal])

            # We should select the first node by default.
            self._store[0][0] = True

            # Kick the user on over to that subscreen.
            self._iscsiNotebook.set_current_page(1)

            # If some form of login credentials were used for discovery,
            # default to using the same for login.
            if self._authTypeCombo.get_active() != 0:
                self._loginAuthTypeCombo.set_active(3)

    def _get_text(self, name):
        """Get the content of the text entry.

        :param name: a name of the widget
        :return: a content of the widget
        """
        return self.builder.get_object(name).get_text()

    def _get_portal(self):
        """Get the portal for the discovery

        :return: an instance of Portal
        """
        portal = Portal()
        portal.ip_address = self._get_text("portalEntry")
        return portal

    def _is_portal_valid(self, portal):
        """Is the portal valid?

        iSCSI Naming Standards: RFC 3720 and RFC 3721
        Name should either match IQN format or EUI format.

        :param portal: an instance of Portal
        :return: True if valid, otherwise False
        """
        return check_ip_address(portal.ip_address)

    def _is_initiator_valid(self, initiator):
        """Is the initiator name valid?"""
        return bool(
            ISCSI_IQN_NAME_REGEX.match(initiator.strip())
            or ISCSI_EUI_NAME_REGEX.match(initiator.strip())
        )

    def _get_discover_credentials(self, style):
        """Get credentials for the discovery.

        The current page from the authNotebook defines how to grab credentials
        out of the UI. This works as long as authNotebook keeps the filler page
        at the front.

        :param style: an id of the discovery style
        :return: an instance of Credentials
        """
        # No credentials.
        credentials = Credentials()

        # CHAP
        if style is STYLE_CHAP:
            credentials.username = self._get_text("chapUsernameEntry")
            credentials.password = self._get_text("chapPasswordEntry")

        # Reverse CHAP.
        if style is STYLE_REVERSE_CHAP:
            credentials.username = self._get_text("rchapUsernameEntry")
            credentials.password = self._get_text("rchapPasswordEntry")
            credentials.reverse_username = self._get_text("rchapReverseUsername")
            credentials.reverse_password = self._get_text("rchapReversePassword")

        return credentials

    def _are_credentials_valid(self, style, credentials):
        """Are the credentials valid?

        :param style: an id of the login style
        :param credentials: an instance of Credentials
        :return: True if valid, otherwise False
        """
        if style is STYLE_NONE:
            return True

        if style is STYLE_CHAP:
            return credentials.username.strip() != "" \
                   and credentials.password != ""

        if style is STYLE_REVERSE_CHAP:
            return credentials.username.strip() != "" \
                   and credentials.password != "" \
                   and credentials.reverse_username.strip() != "" \
                   and credentials.reverse_password != ""

    def _set_configure_sensitive(self, sensitivity):
        """Set the sensitivity of the configuration."""
        for child in self._configureGrid.get_children():
            if child == self._initiatorEntry:
                self._initiatorEntry.set_sensitive(self._iscsi_module.CanSetInitiator())
            elif child == self._bindCheckbox:
                self._bindCheckbox.set_sensitive(sensitivity and self._mode_change_is_allowed())
            elif child != self._conditionNotebook:
                child.set_sensitive(sensitivity)

    ##
    ## LOGGING IN
    ##

    def on_login_type_changed(self, widget, *args):
        """Validate the credentials.

        When we change the notebook, we also need to reverify the credentials
        in order to set the Log In button sensitivity.
        """
        self._loginAuthNotebook.set_current_page(widget.get_active())
        self.on_login_field_changed()

    def on_login_field_changed(self, *args):
        """Validate the login fields."""
        style, credentials = self._get_login_style_and_credentials()
        sensitive = self._are_credentials_valid(style, credentials)
        self._loginButton.set_sensitive(sensitive)

    def on_row_toggled(self, button, path):
        """Mark the row as selected."""
        if not path:
            return

        # Then, go back and mark just this row as selected.
        itr = self._storeFilter.get_iter(path)
        itr = self._storeFilter.convert_iter_to_child_iter(itr)
        self._store[itr][0] = not self._store[itr][0]

    def on_discover_entry_activated(self, *args):
        """Retry discovery.

        When an entry is activated in the discovery view, push either the
        start or retry discovery button.
        """
        current_page = self._conditionNotebook.get_current_page()
        if current_page == 0:
            self._startButton.clicked()
        elif current_page == 2:
            self._retryButton.clicked()

    def on_login_entry_activated(self, *args):
        """Retry login.

        When an entry or a row in the tree view is activated on the login view,
        push the login or retry button
        """
        current_page = self._loginConditionNotebook.get_current_page()
        if current_page == 0:
            self._loginButton.clicked()
        elif current_page == 1:
            self._retryLoginButton.clicked()

    def on_login_clicked(self, *args):
        """Start the login task."""
        row = self._find_row_for_login()

        # Skip, if there is nothing to do.
        if not row:
            return

        # First update widgets.
        self._set_login_sensitive(False)
        self._okButton.set_sensitive(False)
        self._cancelButton.set_sensitive(False)
        self._loginButton.set_sensitive(False)
        self._loginConditionNotebook.set_current_page(0)

        # Get data.
        portal = self._get_portal()
        node = self._find_node_for_row(row)
        _style, credentials = self._get_login_style_and_credentials()

        # Get the login task.
        task_path = self._iscsi_module.LoginWithTask(
            Portal.to_structure(portal),
            Credentials.to_structure(credentials),
            Node.to_structure(node)
        )
        task_proxy = STORAGE.get_proxy(task_path)

        # Start the login.
        async_run_task(task_proxy, lambda task_proxy: self.process_login_result(task_proxy, row))

        self._loginSpinner.start()
        self._loginSpinner.show()

    def process_login_result(self, task_proxy, row):
        """Process the result of the login task.

        :param task_proxy: a task proxy
        :param row: a row in UI
        """
        # Stop the spinner.
        self._loginSpinner.stop()
        self._loginSpinner.hide()

        try:
            # Finish the task
            task_proxy.Finish()
        except StorageDiscoveryError as e:
            # Login has failed, show the error.
            self._loginErrorLabel.set_text(str(e))

            self._set_login_sensitive(True)
            self._loginButton.set_sensitive(True)
            self._cancelButton.set_sensitive(True)
            self._loginConditionNotebook.set_current_page(1)
        else:
            # Login succeeded.
            self._update_devicetree = True

            # Update the row.
            row[1] = False

            # Are there more rows for login? Run again.
            if self._find_row_for_login():
                self.on_login_clicked()
                return

            # Are there more rows to select? Continue.
            if self._select_row_for_login():
                self._set_login_sensitive(True)
                self._okButton.set_sensitive(True)
                self._cancelButton.set_sensitive(False)
                self._loginButton.set_sensitive(True)
                self._loginConditionNotebook.set_current_page(0)
                return

            # There is nothing else to do. Quit.
            self.window.response(1)

    def _get_login_style_and_credentials(self):
        """Get style and credentials for login.

        :return: a tuple with a style and a credentials
        """
        if self._loginAuthNotebook.get_current_page() == 3:
            style = self._authNotebook.get_current_page()
            credentials = self._get_discover_credentials(style)
        else:
            style = self._loginAuthNotebook.get_current_page()
            credentials = self._get_login_credentials(style)

        return style, credentials

    def _get_login_credentials(self, style):
        """Get credentials for the login.

        The current page from the loginAuthNotebook defines how to grab credentials
        out of the UI. This works as long as loginAuthNotebook keeps the filler page
        at the front, and we check to make sure "Use the credentials from discovery"
        is not selected first.

        :param style: an id of the login style
        :return: an instance of Credentials
        """
        # No credentials.
        credentials = Credentials()

        # CHAP
        if style is STYLE_CHAP:
            credentials.username = self._get_text("loginChapUsernameEntry")
            credentials.password = self._get_text("loginChapPasswordEntry")

        # Reverse CHAP.
        if style is STYLE_REVERSE_CHAP:
            credentials.username = self._get_text("loginRchapUsernameEntry")
            credentials.password = self._get_text("loginRchapPasswordEntry")
            credentials.reverse_username = self._get_text("loginRchapReverseUsername")
            credentials.reverse_password = self._get_text("loginRchapReversePassword")

        return credentials

    def _find_row_for_login(self):
        """Find a row for login.

        Find a row that we can use to run a login task.

        :return: a row in UI
        """
        for row in self._store:
            obj = NodeStoreRow(*row)
            if obj.selected and obj.notLoggedIn:
                return row

        return None

    def _find_node_for_row(self, row):
        """Find a node for the given row.

        Find a node for the given row in UI.

        :param row: a row in UI
        :return: a discovered node
        """
        obj = NodeStoreRow(*row)
        for node in self._discovered_nodes:
            if (node.name == obj.name and obj.portal == "%s:%s" % (node.address, node.port)
                and (not node.iface or node.net_ifacename == obj.iface)):
                return node

        return None

    def _select_row_for_login(self):
        """Select the first row we could use for login.

        :return: True if a row was selected, otherwise False
        """
        for row in self._store:
            if row[1]:
                row[0] = True
                return True

        return False

    def _set_login_sensitive(self, sensitivity):
        """Set the sensitivity of the login configuration."""
        for child in self._loginGrid.get_children():
            if child != self._loginConditionNotebook:
                child.set_sensitive(sensitivity)

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