halkyon/deploy/.env.example

# Copy to deploy/.env, restrict it (chmod 600), and fill in. deploy/.env is git-ignored
# and never goes into an image. How it reaches the server is decided when the server is
# set up (e.g. rendered from Proton Pass on the deploying machine and copied over SSH,
# so the server itself never holds Proton credentials).

# `http://localhost` for the local rehearsal; `learn.halkyon.eu` on its server.
DOMAIN=http://localhost

# The domain people's handles are on (`raisondetredev@halkyon.eu`) and their profile
# pages (`https://halkyon.eu/@raisondetredev`, ADR 0011), when it isn't DOMAIN's host:
# point its DNS (A and AAAA) at this server, and Caddy serves the profile pages there,
# nothing else. Unset: DOMAIN's host. Decide before anyone follows a handle: it can
# never change once the fediverse knows it.
#ACCOUNT_DOMAIN=halkyon.eu

# The instance's other services (optional, ADR 0016), such as Halkyon Todo: Halkyon
# Learn holds the instance's register of accounts, so an address, a GitHub account and a
# handle are one person in every service, and deleting the account deletes it in all.
# The register learns when someone signs in to which service (the privacy page says so).
# INSTANCE_SECRET is the secret the services share, carried by every call between them:
# the same value in each service's environment, never given to a device. Empty: no
# service calls another. Generate: openssl rand -hex 32
#INSTANCE_SECRET=
# The web servers of the other services as this server reaches them on the instance's
# own network (never through the internet), separated by commas or spaces
# (`http://todo-server:8082`): told when an account goes, so each deletes that person's
# data too, and told again hourly until each answers. Each of them sets, in its own
# environment, the same INSTANCE_SECRET and ACCOUNT_REGISTER_URL, this server's web
# server as it reaches it (`http://server:8082`). Learn never takes ACCOUNT_REGISTER_URL:
# it doesn't start with one, as it holds the register.
#INSTANCE_MEMBERS=

# Sidecars switched on beside the instance (sidecars/README.md), each by its compose file
# after the instance's own: compose.jellyfin.yaml, a Jellyfin people watch and listen to
# learn from. Unset: the instance alone.
#COMPOSE_FILE=compose.yaml:compose.jellyfin.yaml

# With the Jellyfin sidecar: the domain it answers at, which the instance then suggests
# to its people (the app's Jellyfin sign-in fills it in).
#JELLYFIN_DOMAIN=jellyfin.example.org

# Postgres password, shared by the postgres and server services.
# Generate: openssl rand -base64 32
POSTGRES_PASSWORD=

# Pepper for hashing session keys (server-side sessions). NEVER change it once
# sessions exist: everyone would be signed out, and anonymous accounts can't sign
# back in. Rotation only via fallbackSessionKeyHashPeppers.
# Generate: openssl rand -base64 32
SESSION_KEY_HASH_PEPPER=

# GitHub sign-in (optional): the client ID and secret of this instance's own GitHub
# OAuth app (GitHub → Settings → Developer settings → OAuth Apps), registered with the
# callback URLs app.halkyon.learn://github-callback and http://127.0.0.1/github-callback.
# Empty: GitHub sign-in is off, and the app doesn't offer it.
GITHUB_CLIENT_ID=
GITHUB_CLIENT_SECRET=

# Email sign-in (optional, ADR 0010): people sign in with a code mailed to their address,
# of which the instance keeps only a keyed hash. Off unless the pepper and all of the SMTP
# service's settings are set; the app then doesn't offer it.
# The pepper: NEVER change it once anybody signs in with an address, as every address's
# hash would be lost, and with it those people's way in.
# Generate: openssl rand -hex 32
EMAIL_SIGN_IN_PEPPER=
# The SMTP service codes go through, over TLS only (STARTTLS, or TLS directly on 465).
# Proton (a paid plan with an address on your own domain): smtp.protonmail.ch, 587, the
# address as the user, an SMTP token made for it in Proton Mail's settings (IMAP/SMTP) as
# the password, and the same address as EMAIL_FROM. Some hosts block outgoing 25 and 465;
# 587 gets through.
EMAIL_SMTP_HOST=
EMAIL_SMTP_PORT=587
EMAIL_SMTP_USER=
EMAIL_SMTP_PASSWORD=
# The address codes come from (shown as "Halkyon Learn"); its domain needs SPF, DKIM and
# DMARC records for the service, or mail lands in spam.
EMAIL_FROM=

# Password sign-in (ADR 0017): an address, a password that never leaves the device, and
# a code from an authenticator app. Off unless all three keys and email sign-in are set
# up (resets go by mail); each key at least 32 characters, or the server doesn't start.
# They stay outside the database, so a copy of it alone gives none of this away:
# TOTP_KEY seals the authenticators' secrets: changing it makes every authenticator
#   useless (people then reset theirs, 72 hours, by mail).
# RECOVERY_CODE_KEY keys the recovery codes' hashes: changing it voids every recovery
#   code (people make new ones once signed in).
# SIGN_IN_DECOY_KEY makes the answers for addresses nobody has look like an account's:
#   changing it lets someone who watched those answers tell which addresses are unused.
# Generate each: openssl rand -hex 32
TOTP_KEY=
RECOVERY_CODE_KEY=
SIGN_IN_DECOY_KEY=
# SimpleLogin (ADR 0020): people sign in with their SimpleLogin or Proton account, of
# which the instance keeps only SimpleLogin's ID for them (no address, no name). Off
# unless both are set: the client ID and secret of this instance's own SimpleLogin app
# (SimpleLogin → Settings → Developer → New website), registered with the callback
# /simplelogin-callback on the server's web address (on learn.halkyon.eu's server
# https://learn.halkyon.eu/simplelogin-callback), its forwarding page back to the apps.
SIMPLELOGIN_CLIENT_ID=
SIMPLELOGIN_CLIENT_SECRET=
# Another callback than this server's own page, as the app registered it (https only).
#SIMPLELOGIN_CALLBACK_URL=https://learn.example.org/simplelogin-callback
# The ways in the app offers, of those set up above: simplelogin, password, or both
# (separated by spaces or commas). Empty: every way set up. An unknown name stops the
# server as it starts.
#SIGN_IN_WAYS=simplelogin

# The day GitHub stops signing anyone in, three months after the release that brings
# passwords (ADR 0017, D2): from then on its people sign in with their address and
# password only, and the daily pruning forgets every GitHub ID. Empty: GitHub goes on.
#GITHUB_SIGN_IN_ENDS=2027-01-22

# Where the source of what this instance runs is, shown in the app's About dialog: both
# licences (AGPL for the app, SSPL for the server) require offering it to the people who
# use the instance. Empty: the project's repository, which is right for unmodified code.
# Running modified code, set it to where your modified source is published.
SOURCE_URL=

# The languages besides Japanese whose dictionaries this instance keeps (the dictionaries
# service): Chinese from CC-CEDICT, weekly (some 4 MB), in simplified and traditional
# characters; Korean from KRDict, about monthly (some 84 MB); their characters from
# Unihan, weekly (some 8 MB); the rest from Wiktionary (German and Greek with English
# meanings, English with German ones; for Korean the forms of its words and the
# readings of its Hanja), whose whole dump (some 3 GB) it downloads whenever kaikki.org
# makes a new one, about monthly, and converts in ten minutes. Unset: de,el,en,ko,zh.
# Empty: none. Files of a language taken out are removed, and the server unloads them.
#DICTIONARY_LANGUAGES=de,el,en,ko,zh

# The Jellyfin server the app suggests to this instance's people, who watch and listen
# to learn from it (Halkyon Learn's Watch screen). Empty: `https://jellyfin.` on the
# domain registered for this instance (learn.example.org → jellyfin.example.org), if a
# Jellyfin server answers there; `none`: no suggestion.
JELLYFIN_URL=

# Where this instance keeps people's data, and its backups, which the app shows as a flag
# and in words when someone chooses an instance: `EU`, a country's code (ISO 3166-1
# alpha-2, `DE`, `CH`) or a subdivision's (ISO 3166-2, `DE-BY`, `US-CA`); for the backups
# also `none`. As precise as you know: the app adds "(EU)" to a member country and the
# country to a subdivision ("Germany (EU)", "California, United States"). Where the disks
# are, not which law governs you as the operator: claim only that. Empty: the app says
# nothing.
DATA_LOCATION=
BACKUP_LOCATION=

# How much room people's images and sounds may take on this instance, in MiB. Empty: the
# defaults, 100 for an anonymous person (anonymous accounts are meant to become identified
# ones), 500 for one signed in with GitHub, and 15000 for everyone together (0: no limit
# for everyone together). Every file is in the database, so also in each of the 3 dumps
# this server keeps (and a fourth while a deploy writes its own): files take five times
# their size on the disk. One person may get more than the default; as the operator,
# in deploy/ (their id is their account's, "authUserId"):
#   docker compose exec postgres psql -U halkyon_learn -d halkyon_learn -c "INSERT INTO
#     file_allowance (\"authUserId\", \"maxBytes\", note) VALUES ('<id>', 2147483648, 'asked by mail')"
FILE_LIMIT_ANONYMOUS_MB=
FILE_LIMIT_IDENTIFIED_MB=
FILE_LIMIT_INSTANCE_MB=