ergo/conventional.yaml

# This is the "conventional" or "mainstream" config file for Oragono.
# It tries to replicate the behavior of other ircds, at the cost of not
# taking full advantage of Oragono's features. This config is suitable for use
# in IRCv3 conformance testing.

# network configuration
network:
    # name of the network
    name: OragonoTest

# server configuration
server:
    # server name
    name: oragono.test

    # addresses to listen on
    listeners:
        # This version of the config provides a public plaintext listener on
        # port 6667 for testing and compatibility with legacy applications.
        # We recommend disabling this listener in a production setting
        # and replacing it with loopback-only listeners (see default.yaml):
        ":6667":

        # The standard SSL/TLS port for IRC is 6697. This will listen on all interfaces:
        ":6697":
            tls:
                cert: fullchain.pem
                key: privkey.pem
                # 'proxy' should typically be false. It's only for Kubernetes-style load
                # balancing that does not terminate TLS, but sends an initial PROXY line
                # in plaintext.
                proxy: false

        # Example of a Unix domain socket for proxying:
        # "/tmp/oragono_sock":

        # Example of a Tor listener: any connection that comes in on this listener will
        # be considered a Tor connection. It is strongly recommended that this listener
        # *not* be on a public interface --- it should be on 127.0.0.0/8 or unix domain:
        # "/hidden_service_sockets/oragono_tor_sock":
        #     tor: true

        # Example of a WebSocket listener:
        # ":8097":
        #     websocket: true
        #     tls:
        #         cert: fullchain.pem
        #         key: privkey.pem

    # sets the permissions for Unix listen sockets. on a typical Linux system,
    # the default is 0775 or 0755, which prevents other users/groups from connecting
    # to the socket. With 0777, it behaves like a normal TCP socket
    # where anyone can connect.
    unix-bind-mode: 0777

    # configure the behavior of Tor listeners (ignored if you didn't enable any):
    tor-listeners:
        # if this is true, connections from Tor must authenticate with SASL
        require-sasl: false

        # what hostname should be displayed for Tor connections?
        vhost: "tor-network.onion"

        # allow at most this many connections at once (0 for no limit):
        max-connections: 64

        # connection throttling (limit how many connection attempts are allowed at once):
        throttle-duration: 10m
        # set to 0 to disable throttling:
        max-connections-per-duration: 64

    # strict transport security, to get clients to automagically use TLS
    sts:
        # whether to advertise STS
        #
        # to stop advertising STS, leave this enabled and set 'duration' below to "0". this will
        # advertise to connecting users that the STS policy they have saved is no longer valid
        enabled: false

        # how long clients should be forced to use TLS for.
        # setting this to a too-long time will mean bad things if you later remove your TLS.
        # the default duration below is 1 month, 2 days and 5 minutes.
        duration: 1mo2d5m

        # tls port - you should be listening on this port above
        port: 6697

        # should clients include this STS policy when they ship their inbuilt preload lists?
        preload: false

    websockets:
        # Restrict the origin of WebSocket connections by matching the "Origin" HTTP
        # header. This settings makes oragono reject every WebSocket connection,
        # except when it originates from one of the hosts in this list. Use this to
        # prevent malicious websites from making their visitors connect to oragono
        # without their knowledge. An empty list means that there are no restrictions.
        allowed-origins:
            # - "https://oragono.io"
            # - "https://*.oragono.io"

    # casemapping controls what kinds of strings are permitted as identifiers (nicknames,
    # channel names, account names, etc.), and how they are normalized for case.
    # with the recommended default of 'precis', UTF8 identifiers that are "sane"
    # (according to RFC 8265) are allowed, and the server additionally tries to protect
    # against confusable characters ("homoglyph attacks").
    # the other options are 'ascii' (traditional ASCII-only identifiers), and 'permissive',
    # which allows identifiers to contain unusual characters like emoji, but makes users
    # vulnerable to homoglyph attacks. unless you're really confident in your decision,
    # we recommend leaving this value at its default (changing it once the network is
    # already up and running is problematic).
    casemapping: "precis"

    # enforce-utf8 controls whether the server allows non-UTF8 bytes in messages
    # (as in traditional IRC) or preemptively discards non-UTF8 messages (since
    # they cannot be relayed to websocket clients).
    enforce-utf8: true

    # whether to look up user hostnames with reverse DNS.
    # (disabling this will expose user IPs instead of hostnames;
    # to make IP/hostname information private, see the ip-cloaking section)
    lookup-hostnames: true
    # whether to confirm hostname lookups using "forward-confirmed reverse DNS", i.e., for
    # any hostname returned from reverse DNS, resolve it back to an IP address and reject it
    # unless it matches the connecting IP
    forward-confirm-hostnames: true

    # use ident protocol to get usernames
    check-ident: true

    # password to login to the server
    # generated using  "oragono genpasswd"
    #password: ""

    # motd filename
    # if you change the motd, you should move it to ircd.motd
    motd: oragono.motd

    # motd formatting codes
    # if this is true, the motd is escaped using formatting codes like $c, $b, and $i
    motd-formatting: true

    # addresses/CIDRs the PROXY command can be used from
    # this should be restricted to localhost (127.0.0.1/8, ::1/128, and unix sockets),
    # unless you have a good reason. you should also add these addresses to the
    # connection limits and throttling exemption lists.
    proxy-allowed-from:
        - localhost
        # - "192.168.1.1"
        # - "192.168.10.1/24"

    # controls the use of the WEBIRC command (by IRC<->web interfaces, bouncers and similar)
    webirc:
        # one webirc block -- should correspond to one set of gateways
        -
            # SHA-256 fingerprint of the TLS certificate the gateway must use to connect
            # (comment this out to use passwords only)
            fingerprint: "abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"

            # password the gateway uses to connect, made with oragono genpasswd
            password: "$2a$04$abcdef0123456789abcdef0123456789abcdef0123456789abcde"

            # addresses/CIDRs that can use this webirc command
            # you should also add these addresses to the connection limits and throttling exemption lists
            hosts:
                - localhost
                # - "192.168.1.1"
                # - "192.168.10.1/24"

    # allow use of the RESUME extension over plaintext connections:
    # do not enable this unless the ircd is only accessible over internal networks
    allow-plaintext-resume: false

    # maximum length of clients' sendQ in bytes
    # this should be big enough to hold bursts of channel/direct messages
    max-sendq: 96k

    # compatibility with legacy clients
    compatibility:
        # many clients require that the final parameter of certain messages be an
        # RFC1459 trailing parameter, i.e., prefixed with :, whether or not this is
        # actually required. this forces Oragono to send those parameters
        # as trailings. this is recommended unless you're testing clients for conformance;
        # defaults to true when unset for that reason.
        force-trailing: true

        # some clients (ZNC 1.6.x and lower, Pidgin 2.12 and lower) do not
        # respond correctly to SASL messages with the server name as a prefix:
        # https://github.com/znc/znc/issues/1212
        # this works around that bug, allowing them to use SASL.
        send-unprefixed-sasl: true

    # IP-based DoS protection
    ip-limits:
        # whether to limit the total number of concurrent connections per IP/CIDR
        count: true
        # maximum concurrent connections per IP/CIDR
        max-concurrent-connections: 16

        # whether to restrict the rate of new connections per IP/CIDR
        throttle: true
        # how long to keep track of connections for
        window: 10m
        # maximum number of new connections per IP/CIDR within the given duration
        max-connections-per-window: 32
        # how long to ban offenders for. after banning them, the number of connections is
        # reset, which lets you use /UNDLINE to unban people
        throttle-ban-duration: 10m

        # how wide the CIDR should be for IPv4 (a /32 is a fully specified IPv4 address)
        cidr-len-ipv4: 32
        # how wide the CIDR should be for IPv6 (a /64 is the typical prefix assigned
        # by an ISP to an individual customer for their LAN)
        cidr-len-ipv6: 64

        # IPs/networks which are exempted from connection limits
        exempted:
            - "localhost"
            # - "192.168.1.1"
            # - "2001:0db8::/32"

        # custom connection limits for certain IPs/networks. note that CIDR
        # widths defined here override the default CIDR width --- the limit
        # will apply to the entire CIDR no matter how large or small it is
        custom-limits:
            # "8.8.0.0/16":
            #     max-concurrent-connections: 128
            #     max-connections-per-window: 1024

    # IP cloaking hides users' IP addresses from other users and from channel admins
    # (but not from server admins), while still allowing channel admins to ban
    # offending IP addresses or networks. In place of hostnames derived from reverse
    # DNS, users see fake domain names like pwbs2ui4377257x8.oragono. These names are
    # generated deterministically from the underlying IP address, but if the underlying
    # IP is not already known, it is infeasible to recover it from the cloaked name.
    ip-cloaking:
        # whether to enable IP cloaking
        enabled: false

        # fake TLD at the end of the hostname, e.g., pwbs2ui4377257x8.irc
        # you may want to use your network name here
        netname: "irc"

        # the cloaked hostname is derived only from the CIDR (most significant bits
        # of the IP address), up to a configurable number of bits. this is the
        # granularity at which bans will take effect for IPv4. Note that changing
        # this value will invalidate any stored bans.
        cidr-len-ipv4: 32

        # analogous granularity for IPv6
        cidr-len-ipv6: 64

        # number of bits of hash output to include in the cloaked hostname.
        # more bits means less likelihood of distinct IPs colliding,
        # at the cost of a longer cloaked hostname. if this value is set to 0,
        # all users will receive simply `netname` as their cloaked hostname.
        num-bits: 64

    # secure-nets identifies IPs and CIDRs which are secure at layer 3,
    # for example, because they are on a trusted internal LAN or a VPN.
    # plaintext connections from these IPs and CIDRs will be considered
    # secure (clients will receive the +Z mode and be allowed to resume
    # or reattach to secure connections). note that loopback IPs are always
    # considered secure:
    secure-nets:
        # - "10.0.0.0/8"

    # oragono will write files to disk under certain circumstances, e.g.,
    # CPU profiling or data export. by default, these files will be written
    # to the working directory. set this to customize:
    # output-path: "/home/oragono/out"

# account options
accounts:
    # is account authentication enabled, i.e., can users log into existing accounts?
    authentication-enabled: true

    # account registration
    registration:
        # can users register new accounts for themselves? if this is false, operators with
        # the `accreg` capability can still create accounts with `/NICKSERV SAREGISTER`
        enabled: true

        # global throttle on new account creation
        throttling:
            enabled: true
            # window
            duration: 10m
            # number of attempts allowed within the window
            max-attempts: 30

        # this is the bcrypt cost we'll use for account passwords
        bcrypt-cost: 9

        # length of time a user has to verify their account before it can be re-registered
        verify-timeout: "32h"

        # callbacks to allow
        enabled-callbacks:
            - none # no verification needed, will instantly register successfully

        # example configuration for sending verification emails
        # callbacks:
        #     mailto:
        #         sender: "admin@my.network"
        #         require-tls: true
        #         helo-domain: "my.network" # defaults to server name if unset
        #         dkim:
        #             domain: "my.network"
        #             selector: "20200229"
        #             key-file: "dkim.pem"
        #         # to use an MTA/smarthost instead of sending email directly:
        #         # mta:
        #         #     server: localhost
        #         #     port: 25
        #         #     username: "admin"
        #         #     password: "hunter2"
        #         blacklist-regexes:
        #         #    - ".*@mailinator.com"

    # throttle account login attempts (to prevent either password guessing, or DoS
    # attacks on the server aimed at forcing repeated expensive bcrypt computations)
    login-throttling:
        enabled: true

        # window
        duration:  1m

        # number of attempts allowed within the window
        max-attempts: 3

    # some clients (notably Pidgin and Hexchat) offer only a single password field,
    # which makes it impossible to specify a separate server password (for the PASS
    # command) and SASL password. if this option is set to true, a client that
    # successfully authenticates with SASL will not be required to send
    # PASS as well, so it can be configured to authenticate with SASL only.
    skip-server-password: false

    # enable login to accounts via the PASS command, e.g., PASS account:password
    # this is sometimes useful for compatibility with old clients that don't support SASL
    login-via-pass-command: false

    # require-sasl controls whether clients are required to have accounts
    # (and sign into them using SASL) to connect to the server
    require-sasl:
        # if this is enabled, all clients must authenticate with SASL while connecting
        enabled: false

        # IPs/CIDRs which are exempted from the account requirement
        exempted:
            - "localhost"
            # - '10.10.0.0/16'

    # nick-reservation controls how, and whether, nicknames are linked to accounts
    nick-reservation:
        # is there any enforcement of reserved nicknames?
        enabled: true

        # how many nicknames, in addition to the account name, can be reserved?
        additional-nick-limit: 2

        # method describes how nickname reservation is handled
        #   timeout:  let the user change to the registered nickname, give them X seconds
        #             to login and then rename them if they haven't done so
        #   strict:   don't let the user change to the registered nickname unless they're
        #             already logged-in using SASL or NickServ
        #   optional: no enforcement by default, but allow users to opt in to
        #             the enforcement level of their choice
        #
        # 'optional' matches the behavior of other NickServs, but 'strict' is
        # preferable if all your users can enable SASL.
        method: optional

        # allow users to set their own nickname enforcement status, e.g.,
        # to opt out of strict enforcement
        allow-custom-enforcement: true

        # rename-timeout - this is how long users have 'til they're renamed
        rename-timeout: 30s

        # format for guest nicknames:
        # 1. these nicknames cannot be registered or reserved
        # 2. if a client is automatically renamed by the server,
        #    this is the template that will be used (e.g., Guest-nccj6rgmt97cg)
        # 3. if enforce-guest-format (see below) is enabled, clients without
        #    a registered account will have this template applied to their
        #    nicknames (e.g., 'katie' will become 'Guest-katie')
        guest-nickname-format: "Guest-*"

        # when enabled, forces users not logged into an account to use
        # a nickname matching the guest template. a caveat: this may prevent
        # users from choosing nicknames in scripts different from the guest
        # nickname format.
        force-guest-format: false

        # when enabled, forces users logged into an account to use the
        # account name as their nickname. when combined with strict nickname
        # enforcement, this lets users treat nicknames and account names
        # as equivalent for the purpose of ban/invite/exception lists.
        force-nick-equals-account: false

    # multiclient controls whether oragono allows multiple connections to
    # attach to the same client/nickname identity; this is part of the
    # functionality traditionally provided by a bouncer like ZNC
    multiclient:
        # when disabled, each connection must use a separate nickname (as is the
        # typical behavior of IRC servers). when enabled, a new connection that
        # has authenticated with SASL can associate itself with an existing
        # client
        enabled: true

        # if this is disabled, clients have to opt in to bouncer functionality
        # using nickserv or the cap system. if it's enabled, they can opt out
        # via nickserv
        allowed-by-default: false

        # whether to allow clients that remain on the server even
        # when they have no active connections. The possible values are:
        # "disabled", "opt-in", "opt-out", or "mandatory".
        always-on: "disabled"

        # whether to mark always-on clients away when they have no active connections:
        auto-away: "opt-in"

    # vhosts controls the assignment of vhosts (strings displayed in place of the user's
    # hostname/IP) by the HostServ service
    vhosts:
        # are vhosts enabled at all?
        enabled: true

        # maximum length of a vhost
        max-length: 64

        # regexp for testing the validity of a vhost
        # (make sure any changes you make here are RFC-compliant)
        valid-regexp: '^[0-9A-Za-z.\-_/]+$'

        # options controlling users requesting vhosts:
        user-requests:
            # can users request vhosts at all? if this is false, operators with the
            # 'vhosts' capability can still assign vhosts manually
            enabled: false

            # if uncommented, all new vhost requests will be dumped into the given
            # channel, so opers can review them as they are sent in. ensure that you
            # have registered and restricted the channel appropriately before you
            # uncomment this.
            #channel: "#vhosts"

            # after a user's vhost has been approved or rejected, they need to wait
            # this long (starting from the time of their original request)
            # before they can request a new one.
            cooldown: 168h

        # vhosts that users can take without approval, using `/HS TAKE`
        offer-list:
            #- "oragono.test"

    # modes that are set by default when a user connects
    # if unset, no user modes will be set by default
    # +i is invisible (a user's channels are hidden from whois replies)
    # see  /QUOTE HELP umodes  for more user modes
    # default-user-modes: +i

    # pluggable authentication mechanism, via subprocess invocation
    # see the manual for details on how to write an authentication plugin script
    auth-script:
        enabled: false
        command: "/usr/local/bin/authenticate-irc-user"
        # constant list of args to pass to the command; the actual authentication
        # data is transmitted over stdin/stdout:
        args: []
        # should we automatically create users if the plugin returns success?
        autocreate: true
        # timeout for process execution, after which we send a SIGTERM:
        timeout: 9s
        # how long after the SIGTERM before we follow up with a SIGKILL:
        kill-timeout: 1s

# channel options
channels:
    # modes that are set when new channels are created
    # +n is no-external-messages and +t is op-only-topic
    # see  /QUOTE HELP cmodes  for more channel modes
    default-modes: +nt

    # how many channels can a client be in at once?
    max-channels-per-client: 100

    # if this is true, new channels can only be created by operators with the
    # `chanreg` operator capability
    operator-only-creation: false

    # channel registration - requires an account
    registration:
        # can users register new channels?
        enabled: true

        # restrict new channel registrations to operators only?
        # (operators can then transfer channels to regular users using /CS TRANSFER)
        operator-only: false

        # how many channels can each account register?
        max-channels-per-account: 15

    # as a crude countermeasure against spambots, anonymous connections younger
    # than this value will get an empty response to /LIST (a time period of 0 disables)
    list-delay: 0s

# operator classes
oper-classes:
    # local operator
    "local-oper":
        # title shown in WHOIS
        title: Local Operator

        # capability names
        capabilities:
            - "local_kill"
            - "local_ban"
            - "local_unban"
            - "nofakelag"
            - "roleplay"

    # network operator
    "network-oper":
        # title shown in WHOIS
        title: Network Operator

        # oper class this extends from
        extends: "local-oper"

        # capability names
        capabilities:
            - "remote_kill"
            - "remote_ban"
            - "remote_unban"

    # server admin
    "server-admin":
        # title shown in WHOIS
        title: Server Admin

        # oper class this extends from
        extends: "local-oper"

        # capability names
        capabilities:
            - "rehash"
            - "die"
            - "accreg"
            - "sajoin"
            - "samode"
            - "vhosts"
            - "chanreg"
            - "history"

# ircd operators
opers:
    # operator named 'admin'; log in with /OPER admin [password]
    admin:
        # which capabilities this oper has access to
        class: "server-admin"

        # custom whois line
        whois-line: is a cool dude

        # custom hostname
        vhost: "n"

        # modes are the modes to auto-set upon opering-up
        modes: +is acjknoqtuxv

        # operators can be authenticated either by password (with the /OPER command),
        # or by certificate fingerprint, or both. if a password hash is set, then a
        # password is required to oper up (e.g., /OPER dan mypassword). to generate
        # the hash, use `oragono genpasswd`.
        password: "$2a$04$0123456789abcdef0123456789abcdef0123456789abcdef01234"

        # if a SHA-256 certificate fingerprint is configured here, then it will be
        # required to /OPER. if you comment out the password hash above, then you can
        # /OPER without a password.
        #fingerprint: "abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"
        # if 'auto' is set (and no password hash is set), operator permissions will be
        # granted automatically as soon as you connect with the right fingerprint.
        #auto: true

# logging, takes inspiration from Insp
logging:
    -
        # how to log these messages
        #
        #   file    log to a file
        #   stdout  log to stdout
        #   stderr  log to stderr
        #   (you can specify multiple methods, e.g., to log to both stderr and a file)
        method: stderr

        # filename to log to, if file method is selected
        # filename: ircd.log

        # type(s) of logs to keep here. you can use - to exclude those types
        #
        # exclusions take precedent over inclusions, so if you exclude a type it will NEVER
        # be logged, even if you explicitly include it
        #
        # useful types include:
        #   *               everything (usually used with exclusing some types below)
        #   server          server startup, rehash, and shutdown events
        #   accounts        account registration and authentication
        #   channels        channel creation and operations
        #   commands        command calling and operations
        #   opers           oper actions, authentication, etc
        #   services        actions related to NickServ, ChanServ, etc.
        #   internal        unexpected runtime behavior, including potential bugs
        #   userinput       raw lines sent by users
        #   useroutput      raw lines sent to users
        type: "* -userinput -useroutput"

        # one of: debug info warn error
        level: info
    #-
    #   # example of a file log that avoids logging IP addresses
    #   method: file
    #   filename: ircd.log
    #   type: "* -userinput -useroutput -connect-ip"
    #   level: debug

# debug options
debug:
    # when enabled, oragono will attempt to recover from certain kinds of
    # client-triggered runtime errors that would normally crash the server.
    # this makes the server more resilient to DoS, but could result in incorrect
    # behavior. deployments that would prefer to "start from scratch", e.g., by
    # letting the process crash and auto-restarting it with systemd, can set
    # this to false.
    recover-from-errors: true

    # optionally expose a pprof http endpoint: https://golang.org/pkg/net/http/pprof/
    # it is strongly recommended that you don't expose this on a public interface;
    # if you need to access it remotely, you can use an SSH tunnel.
    # set to `null`, "", leave blank, or omit to disable
    # pprof-listener: "localhost:6060"

# datastore configuration
datastore:
    # path to the datastore
    path: ircd.db

    # if the database schema requires an upgrade, `autoupgrade` will attempt to
    # perform it automatically on startup. the database will be backed
    # up, and if the upgrade fails, the original database will be restored.
    autoupgrade: true

    # connection information for MySQL (currently only used for persistent history):
    mysql:
        enabled: false
        host: "localhost"
        port: 3306
        # if socket-path is set, it will be used instead of host:port
        #socket-path: "/var/run/mysqld/mysqld.sock"
        user: "oragono"
        password: "hunter2"
        history-database: "oragono_history"
        timeout: 3s

# languages config
languages:
    # whether to load languages
    enabled: true

    # default language to use for new clients
    # 'en' is the default English language in the code
    default: en

    # which directory contains our language files
    path: languages

# limits - these need to be the same across the network
limits:
    # nicklen is the max nick length allowed
    nicklen: 32

    # identlen is the max ident length allowed
    identlen: 20

    # channellen is the max channel length allowed
    channellen: 64

    # awaylen is the maximum length of an away message
    awaylen: 390

    # kicklen is the maximum length of a kick message
    kicklen: 390

    # topiclen is the maximum length of a channel topic
    topiclen: 390

    # maximum number of monitor entries a client can have
    monitor-entries: 100

    # whowas entries to store
    whowas-entries: 100

    # maximum length of channel lists (beI modes)
    chan-list-modes: 60

    # maximum number of messages to accept during registration (prevents
    # DoS / resource exhaustion attacks):
    registration-messages: 1024

    # message length limits for the new multiline cap
    multiline:
        max-bytes: 4096 # 0 means disabled
        max-lines: 100  # 0 means no limit

# fakelag: prevents clients from spamming commands too rapidly
fakelag:
    # whether to enforce fakelag
    enabled: true

    # time unit for counting command rates
    window: 1s

    # clients can send this many commands without fakelag being imposed
    burst-limit: 5

    # once clients have exceeded their burst allowance, they can send only
    # this many commands per `window`:
    messages-per-window: 2

    # client status resets to the default state if they go this long without
    # sending any commands:
    cooldown: 2s

# the roleplay commands are semi-standardized extensions to IRC that allow
# sending and receiving messages from pseudo-nicknames. this can be used either
# for actual roleplaying, or for bridging IRC with other protocols.
roleplay:
    # are roleplay commands enabled at all? (channels and clients still have to
    # opt in individually with the +E mode)
    enabled: true

    # require the "roleplay" oper capability to send roleplay messages?
    require-oper: false

    # require channel operator permissions to send roleplay messages?
    require-chanops: false

    # add the real nickname, in parentheses, to the end of every roleplay message?
    add-suffix: true

# external services can integrate with the ircd using JSON Web Tokens (https://jwt.io).
# in effect, the server can sign a token attesting that the client is present on
# the server, is a member of a particular channel, etc.
extjwt:
    # # default service config (for `EXTJWT #channel`).
    # # expiration time for the token:
    # expiration: 45s
    # # you can configure tokens to be signed either with HMAC and a symmetric secret:
    # secret: "65PHvk0K1_sM-raTsCEhatVkER_QD8a0zVV8gG2EWcI"
    # # or with an RSA private key:
    # #rsa-private-key-file: "extjwt.pem"

    # # named services (for `EXTJWT #channel service_name`):
    # services:
    #     "jitsi":
    #         expiration: 30s
    #         secret: "qmamLKDuOzIzlO8XqsGGewei_At11lewh6jtKfSTbkg"

# history message storage: this is used by CHATHISTORY, HISTORY, znc.in/playback,
# various autoreplay features, and the resume extension
history:
    # should we store messages for later playback?
    # by default, messages are stored in RAM only; they do not persist
    # across server restarts. however, you may want to understand how message
    # history interacts with the GDPR and/or any data privacy laws that apply
    # in your country and the countries of your users.
    enabled: true

    # how many channel-specific events (messages, joins, parts) should be tracked per channel?
    channel-length: 2048

    # how many direct messages and notices should be tracked per user?
    client-length: 256

    # how long should we try to preserve messages?
    # if `autoresize-window` is 0, the in-memory message buffers are preallocated to
    # their maximum length. if it is nonzero, the buffers are initially small and
    # are dynamically expanded up to the maximum length. if the buffer is full
    # and the oldest message is older than `autoresize-window`, then it will overwrite
    # the oldest message rather than resize; otherwise, it will expand if possible.
    autoresize-window: 3d

    # number of messages to automatically play back on channel join (0 to disable):
    autoreplay-on-join: 0

    # maximum number of CHATHISTORY messages that can be
    # requested at once (0 disables support for CHATHISTORY)
    chathistory-maxmessages: 100

    # maximum number of messages that can be replayed at once during znc emulation
    # (znc.in/playback, or automatic replay on initial reattach to a persistent client):
    znc-maxmessages: 2048

    # options to delete old messages, or prevent them from being retrieved
    restrictions:
        # if this is set, messages older than this cannot be retrieved by anyone
        # (and will eventually be deleted from persistent storage, if that's enabled)
        expire-time: 1w

        # if this is set, logged-in users cannot retrieve messages older than their
        # account registration date, and logged-out users cannot retrieve messages
        # older than their sign-on time (modulo grace-period, see below):
        enforce-registration-date: false

        # but if this is set, you can retrieve messages that are up to `grace-period`
        # older than the above cutoff time. this is recommended to allow logged-out
        # users to do session resumption / query history after disconnections.
        grace-period: 1h

    # options to store history messages in a persistent database (currently only MySQL):
    persistent:
        enabled: false

        # store unregistered channel messages in the persistent database?
        unregistered-channels: false

        # for a registered channel, the channel owner can potentially customize
        # the history storage setting. as the server operator, your options are
        # 'disabled' (no persistent storage, regardless of per-channel setting),
        # 'opt-in', 'opt-out', and 'mandatory' (force persistent storage, ignoring
        # per-channel setting):
        registered-channels: "opt-out"

        # direct messages are only stored in the database for logged-in clients;
        # you can control how they are stored here (same options as above).
        # if you enable this, strict nickname reservation is strongly recommended
        # as well.
        direct-messages: "opt-out"

    # options to control how messages are stored and deleted:
    retention:
        # allow users to delete their own messages from history?
        allow-individual-delete: false

        # if persistent history is enabled, create additional index tables,
        # allowing deletion of JSON export of an account's messages. this
        # may be needed for compliance with data privacy regulations.
        enable-account-indexing: false