module czechlight-system {
  yang-version 1.1;
  namespace
    "http://czechlight.cesnet.cz/yang/czechlight-system";

  prefix "cla-sys";

  import ietf-yang-types {
    prefix yang;
  }

  import ietf-netconf-acm {
    prefix nacm;
  }

  import ietf-system {
    prefix "sys";
  }

  organization "CESNET";
  contact "photonic@cesnet.cz";
  description
    "YANG model for system administration in Czechlight devices.";

  revision 2021-01-13 {
    description "Initial release";
  }

  revision 2022-07-08 {
    description "Extended firmware slot properties and actions";
  }

  typedef percent {
    type uint8 {
      range "0 .. 100";
    }
  }

  container firmware {
    config false;

    list firmware-slot {
      key name;

      leaf name {
        description "Identifier of the slot.";
        type string;
      }

      leaf version {
        description "Firmware version installed in the slot.";
        type string;
      }

      leaf installed {
        description "Datetime of the last installation performed in this slot.";
        type yang:date-and-time;
      }

      leaf is-booted-now {
        description "Is the system running from this slot?";
        type boolean;
      }

      leaf is-healthy {
        description "Only healthy slots are considered for booting. Slots which failed during a boot are marked as non-healthy.";
        type boolean;
      }

      leaf will-boot-next {
        description "Is this slot selected for booting after the next reboot?";
        type boolean;
      }

      action set-active-after-reboot {
        description "Schedule this slot for activation after the next reboot";
      }

      action set-unhealthy {
        description "Mark this slot as having faulted during the last boot";
      }
    }

    container installation {
      leaf status {
        description "Informs about the status of the current (or last) installation.";

        type enumeration {
          enum none;
          enum in-progress;
          enum succeeded;
          enum failed;
        }
      }

      leaf message {
        description "The last message from the installation process. This MAY contain the last error message.";
        type string;
      }

      notification update {
        description "Notifies clients about installation progress.";

        leaf message {
          description "Progress status.";
          type string;
        }

        leaf progress {
          description "Progress of the installation in percents.";

          type int8 {
            range "0 .. 100";
          }
        }
      }

      action install {
        nacm:default-deny-all;
        description "Download and install a new firmware image to the inactive FW slot";
        input {
          leaf url {
            description "URL or path to the new firmware.";
            type string;
            mandatory true;
          }
        }
      }
    }
  }

  typedef username-type {
    type string {
      pattern "[a-z][a-z0-9-]{0,30}";
    }
  }

  typedef password-type {
    type string {
      pattern "[^\\r\\n]*";
    }
  }

  grouping authentication-rpc-result {
    leaf result {
      mandatory true;
      type enumeration {
        enum success;
        enum failure;
      }
    }

    leaf message {
      description "Can be used to supply and error message.";
      type string;
    }
  }

  typedef authorized-key-format {
    description "Pubkey in the authorized_keys format for sshd.";
    type string;
  }


  container authentication {
    description "User management";
    list users {
      config false;
      key 'name';
      description "All user accounts which are configured in the Linux system";

      leaf name {
        type username-type;
      }

      leaf password-last-change {
        type string;
      }

      list authorized-keys {
        key 'index';
        description "List of SSH keys which are recognized for this user";

        leaf index {
          type int32;
        }

        leaf public-key {
          mandatory true;
          type authorized-key-format;
        }

        action remove {
          nacm:default-deny-all;
          description "Remove the selected SSH authentication key of the selected user";
          output {
            uses authentication-rpc-result;
          }
        }
      }

      action change-password {
        nacm:default-deny-all;
        input {
          leaf password-cleartext {
            mandatory true;
            description "This is supposed to be a plaintext password. Make sure it's not logged anywhere.";
            type password-type;
          }
        }

        output {
          uses authentication-rpc-result;
        }
      }

      action add-authorized-key {
        nacm:default-deny-all;
        description "Add a new SSH public key for authentication as the selected user";
        input {
          leaf key {
            mandatory true;
            type authorized-key-format;
          }
        }

        output {
          uses authentication-rpc-result;
        }
      }
    }
  }

  container leds {
    config false;
    description "Current status of LEDs.";

    list led {
      key 'name';

      leaf name {
        type string;
        description "Name of the LED";
      }

      leaf brightness {
        mandatory true;
        description "Current brightness of the LED in percents of the maximal possible brightness of the LED.";
        type percent;
      }
    }

    action uid {
      input {
        leaf state {
          mandatory true;
          description "Change state of the UID led (turn off, on, or keep blinking).";
          type enumeration {
            enum off;
            enum on;
            enum blinking;
          }
        }
      }
    }
  }

  deviation /sys:system-shutdown { deviate not-supported; }
  deviation /sys:system/sys:dns-resolver { deviate add { config false; } }
}