Ubuntu Manpage: snac — A simple, minimalistic ActivityPub instance

NAME

       snac — A simple, minimalistic ActivityPub instance

SYNOPSIS

       snac command basedir [option ...]

DESCRIPTION

The snac daemon processes messages from other servers in the Fediverse using the ActivityPub protocol.

This is the user manual and expects an already running snac installation. For the administration manual,
see snac(8). For file and data formats, see snac(5).

Web Interface
The web interface provided by snac is split in two data streams: the public timeline and the private
timeline. There are no other feeds like the server-scoped or the federated firehoses provided by other
similar ActivityPub implementations like Mastodon or Pleroma.

The public timeline, also called the local timeline, is what an external visitor sees about the activity
of a snac user: that is, only the list of public notes, boosts and likes the user generates or
participates into. This is, obviously, read-only, and not very remarkable, unless the user publishes
messages of staggering genious. A set of history links, grouped by month, will also be available at the
bottom of the page.

The private timeline, or simply the timeline, is the private, password-protected area of a snac server
where the user really interacts with the rest of the Fediverse.

The top area of the timeline provides a big text area to write notes for the public (i.e. for the user
followers). As this is the second most important activity on the Fediverse, this is located in the most
prominent area of the user page. You can enter plain text, @user@host mentions and other things. See the
snac(5) manual for more information on the allowed markup.

More options are hidden under a toggle control. They are the following:

Follow (by URL or user@host)
Fill the input area with a user 'actor' URL or a user@host Fediverse identifier to follow.

Boost (by URL)
Fill the input area with the URL of a Fediverse note to be boosted.

User setup...
This option opens the user setup dialog.

The user setup dialog allows some user information to be changed, specifically:

User name
Your user name, or not really that. People like to include emojis, flags and strange
symbols for some reason.

Avatar URL
The URL of a picture to be used as your avatar in timelines around the world.

Bio Enter here a bunch of self-indulgent blurb about yourself. The same markup options
available for text notes apply here.

Always show sensitive content
By default, snac hides content marked as sensitive by their publishers. If you check this
option, sensitive content is always shown.

Email address for notifications
If this field is not empty, an email message will be sent to this address whenever a post
written by you is liked, boosted or replied to.

Telegram notifications
To enable notifications via Telegram, fill the two provided fields (Bot API key and Chat
id). You need to create both a Telegram channel and a bot for this; the process is rather
cumbersome but it's documented everywhere. The Bot API key is a long string of alphanumeric
characters and the chat id is a big, negative number.

ntfy notifications
To enable notifications via ntfy (both self-hosted or standard ntfy.sh server), fill the
two provided fields (ntfy server/topic and, if protected, the token). You need to refer to
the https://ntfy.sh web site for more information on this process.

Maximum days to keep posts
This numeric value specifies the number of days to pass before posts (yours and others')
will be purged. This value overrides what the administrator defined in the global server
settings only if it's lesser (i.e. you cannot keep posts for longer than what the admin
desires). A value of 0 (the default) means that the global server settings will apply to
the posts in your timeline.

Drop direct messages from people you don't follow
Just what it says in the tin. This is to mitigate spammers coming from Fediverse instances
with lax / open registration processes. Please take note that this also avoids possibly
legitimate people trying to contact you.

Password
Write the same string in these two fields to change your password. Don't write anything if
you don't want to do this.

The rest of the page contains your timeline in reverse chronological order (i.e., newest interactions
first). snac shows the conversations as nested trees, unlike other Fediverse software; everytime you
contribute something to a conversation, the full thread is bumped up, so new interactions are shown
always at the top of the page while the forgotten ones languish at the bottom.

Private notes (a.k.a. direct messages) are also shown in the timeline as normal messages, but marked with
a cute lock to mark them as non-public. Replies to direct messages are also private and cannot be liked
nor boosted.

For each entry in the timeline, a set of reasonable actions in the form of buttons will be shown. These
can be:

Reply Unveils a text area to write your intelligent and acute comment to an uninformed fellow.
This note is sent to the original author as well as to your followers. The note can include
mentions in the @user@format; these people will also become recipients of the message. If
you reply to a boost or like, you are really replying to the note, not to the admirer of
it.

Like Click this if you admire this post. The poster and your followers will be informed.

Boost Click this if you want to propagate this post to all your followers. The original author
will also be informed.

Follow Click here if you want to start receiving all the shenanigans the original author of the
post will write in the future.

Unfollow
Click here if you are fed up of this fellow's activities.

Delete Click here to send this post to the bin. If it's an activity written by you, the
appropriate message is sent to the rest of involved parts telling them that you no longer
want your thing in their servers (not all implementations really obey this kind of
requirements, though).

MUTE This is the most important button in snac and the Fediverse in general. Click it if you
don't want to read crap from this user again in the forseeable future.

Hide If a conversation is getting long and annoying but not enough to MUTE its author forever,
click this button to avoid seeing the post and its children anymore.

Edit Posts written by you on snac version 2.19 and later can be edited and resent to their
recipients.

Command-line options
The command-line tool provide the following commands:

init [basedir]
Initializes the data storage. This is an interactive command; necessary information will be
prompted for. The basedir directory must not exist.

upgrade basedir
Upgrades the data storage after installing a new version. Only necessary if snac complains
and demands it.

httpd basedir
Starts the daemon.

purge basedir
Purges old data from the timeline of all users.

adduser basedir [uid]
Adds a new user to the server. This is an interactive command; necessary information will
be prompted for.

resetpwd basedir uid
Resets a user's password to a new, random one.

queue basedir uid
Processes the output queue of the specied user, sending all enqueued messages and re-
enqueing the failing ones. This command must not be executed if the server is running.

follow basedir uid actor
Sends a Follow message for the specified actor URL.

request basedir uid url
Requests an object and dumps it to stdout. This is a very low level command that is not
very useful to you.

note basedir uid text
Enqueues a Create + Note message to all followers. If the text argument is -e, the
external editor defined by the EDITOR environment variable will be invoked to prepare a
message; if it's - (a lonely hyphen), the post content will be read from stdin.

block basedir instance_url
Blocks a full instance, given its URL or domain name. All subsequent incoming activities
with identifiers from that instance will be immediately blocked without further inspection.

unblock basedir instance_url
Unblocks a previously blocked instance.

state basedir
Dumps the current state of the server and its threads. For example:

server: comam.es (snac/2.45-dev)
uptime: 0:03:09:52
job fifo size (cur): 45
job fifo size (peak): 1532
thread #0 state: input
thread #1 state: input
thread #2 state: waiting
thread #3 state: waiting
thread #4 state: output
thread #5 state: output
thread #6 state: output
thread #7 state: waiting

The job fifo size values show the current and peak sizes of the in-memory job queue. The
thread state can be: waiting (idle waiting for a job to be assigned), input or output
(processing I/O packets) or stopped (not running, only to be seen while starting or
stopping the server).

Migrating an account from Mastodon
See snac(8) for details.

Using Mastodon-compatible apps
Since version 2.27, snac includes support for the Mastodon API, so you can use Mastodon-compatible mobile
and desktop applications to access your account. Given a correctly configured server, the usage of these
programs should be straightforward. Please take note that they will show your timeline in a 'Mastodon
fashion' (i.e., as a plain list of posts), so you will lose the fancy, nested thread post display with
the most active threads at the top that the web interface of snac provides.

Implementing post bots
snac makes very easy to post messages in a non-interactive manner. This example posts a string:

uptime | snac note $SNAC_BASEDIR $SNAC_USER -

You can setup a line like this from a crontab(5) or similar. Take note that you need a) command-line
access to the same machine that hosts the snac instance, and b) write permissions to the storage
directories and files.

You can also post non-interactively using the Mastodon API and a command-line http tool like curl(1) or
similar. This has the advantage that you can do it remotely from any host, anywhere; the only thing you
need is an API Token. This is an example:

curl -X POST https://$SNAC_HOST/api/v1/statuses \
--header "Authorization: Bearer ${TOKEN}" -d "status=$(uptime)"

You can obtain an API Token by connecting to the following URL:

https://$SNAC_HOST/oauth/x-snac-get-token

ENVIRONMENT

       DEBUG   Overrides the debugging level from the server 'dbglevel' configuration variable.  Set  it  to  an
               integer value. The higher, the deeper in meaningless verbiage you'll find yourself into.

       EDITOR  The user-preferred interactive text editor to prepare messages.

AUTHORS

       grunfink @grunfink@comam.es: https://comam.es/snac/grunfink

LICENSE

       See the LICENSE file for details.

CAVEATS

       Use the Fediverse sparingly. Don't fear the MUTE button.

BUGS

       Probably plenty. Some issues may be even documented in the TODO.md file.

Debian                                             $Mdocdate$                                            SNAC(1)