Oxicloud/docs/config/env.md

Environment Variables

Most runtime variables use the OXICLOUD_ prefix. A few build-time or allocator variables do not.

Server

Variable	Default	Description
OXICLOUD_STORAGE_PATH	./storage	Root storage directory
OXICLOUD_STATIC_PATH	./static	Static files directory
OXICLOUD_TEMP_DIR	std::env::temp_dir() ($TMPDIR)	Directory for tier-1 temporary data — pure scratch, safe to lose at reboot. Backend services stream blobs here when extractors need a &Path (id3, mp3_duration, ffprobe, nom-exif video). Files are auto-removed after use. On Linux /tmp is often tmpfs (RAM-backed); point at a disk-backed dir under RAM-constrained deployments.
OXICLOUD_SERVER_PORT	8086	Server port
OXICLOUD_SERVER_HOST	127.0.0.1	Server bind address (IPv4 or IPv6 allowed)
OXICLOUD_BASE_URL	(auto)	Public base URL for share links; defaults to http://{host}:{port}
OXICLOUD_MAX_UPLOAD_SIZE	10737418240	Whole-file size ceiling, in bytes (10 GB on 64-bit, 1 GB on 32-bit). Applies to BOTH direct PUTs (per-request body) and chunked uploads (declared total_size, checked upfront at session creation).
OXICLOUD_DIRECT_PUT_MAX_BYTES	1073741824	Per-request cap for non-chunked PUT bodies, in bytes (1 GiB). Set below OXICLOUD_MAX_UPLOAD_SIZE so larger files are pushed onto the chunked protocol (resumable on failure). See Storage Fine Tuning.
OXICLOUD_CHUNK_MAX_BYTES	104857600	Maximum size of a single chunked-upload PUT in bytes (100 MB). Per-chunk cap, independent of OXICLOUD_MAX_UPLOAD_SIZE (whole-file cap). See Storage Fine Tuning.
OXICLOUD_CHUNK_DIR	{STORAGE_PATH}/.uploads	Root directory for chunked-upload sessions (REST + NextCloud). Direct (non-chunked) uploads stream straight into the blob store and need no spool directory. Placement guidance: see Storage Fine Tuning.
OXICLOUD_REUSE_PORT	false	Enable SO_REUSEPORT so multiple processes can share the same port. Disabled by default — a second accidental instance will fail with "address already in use". Enable only for deliberate multi-worker setups (process supervisor, rolling restart). Not supported on Windows.

Database

Variable	Default	Description
OXICLOUD_DB_CONNECTION_STRING	postgres://postgres:postgres@localhost:5432/oxicloud	PostgreSQL connection string
OXICLOUD_DB_MAX_CONNECTIONS	20	Max pool connections
OXICLOUD_DB_MIN_CONNECTIONS	5	Min pool connections
OXICLOUD_DB_MAINTENANCE_MAX_CONNECTIONS	5	Max connections in the isolated maintenance pool
OXICLOUD_DB_MAINTENANCE_MIN_CONNECTIONS	1	Min connections in the isolated maintenance pool

Build-Time SQLx

Variable	Default	Description
DATABASE_URL	—	Build-time database URL for SQLx compile-time checks

Authentication

Variable	Default	Description
OXICLOUD_JWT_SECRET	(auto-generated)	JWT signing secret; auto-persisted to <STORAGE_PATH>/.jwt_secret if unset
OXICLOUD_ACCESS_TOKEN_EXPIRY_SECS	3600	Access token lifetime (1 hour)
OXICLOUD_REFRESH_TOKEN_EXPIRY_SECS	604800	Refresh token lifetime (7 days); active sessions auto-renew on use
OXICLOUD_HASH_MEMORY_COST	65536	Argon2id memory cost in KiB (64 MiB). Server-side — used by the legacy password path (POST /api/auth/login) and the app-password Basic-Auth verifier. Distinct from OXICLOUD_AUTH_OPAQUE_KSF_* (client-side).
OXICLOUD_HASH_TIME_COST	3	Argon2id iteration count for the server-side legacy path.
OXICLOUD_HASH_PARALLELISM	2	Argon2id parallelism lanes for the server-side legacy path.
OXICLOUD_DISABLE_REGISTRATION	false	Disable registration of new user accounts
OXICLOUD_REGISTRATION_ALLOWED_EMAIL_DOMAINS	—	Comma-separated allowlist of email domains accepted on POST /api/auth/register (case-insensitive, exact match on the post-@ part). Empty = any domain is allowed. Distinct from OXICLOUD_EXTERNAL_EMAIL_DOMAINS: this one gates SELF-registration (public sign-up), the external list gates INVITATIONS (grants + magic-link to third parties). An operator can lock sign-up to their company domain while leaving invitations open. Subdomains must be listed explicitly. Rejected registrations return 403 RegistrationDomainNotAllowed and emit an audit line. Example: mycompany.com,mycompany-eu.com.
OXICLOUD_AUTH_METHODS	password,magic_link	Comma-separated allowlist of auth methods (password, magic_link, oidc). Fail-fast: unknown token → boot panic; empty allowlist → boot panic; oidc in list without OXICLOUD_OIDC_ENABLED=true → boot panic. Removing password disables POST /api/auth/login (returns 403 PasswordLoginDisabled) and password-based register (returns 403 PasswordRegistrationDisabled). Removing magic_link disables POST /api/auth/magic-link/send (returns 403 MagicLinkLoginDisabled) and the redemption path for login-purpose tokens. Setting OXICLOUD_AUTH_METHODS=oidc is the cleanest "SSO-only" posture. Loose semantic (deprecation warning): if this list is explicitly set WITHOUT oidc but OXICLOUD_OIDC_ENABLED=true, OIDC is served regardless — a boot warning is emitted and this will become a fail-fast panic in the next major release. Startup gate: if magic_link is the only working method (no password, no oidc) AND no SMTP transport is configured (OXICLOUD_SMTP_HOST empty), the server refuses to start. OIDC master rule: when OIDC is enabled, magic-link login is hard-disabled regardless of this list (would otherwise bypass IdP-enforced MFA / step-up). Legacy alias (DEPRECATED): OXICLOUD_OIDC_DISABLE_PASSWORD_LOGIN=true still removes password from the list but emits a boot warning; removal in next major release.
OXICLOUD_AUTH_POLICIES	—	Comma-separated additive policy switches. Each token grants an exception or restriction to the default auth behaviour; empty (unset) = pure defaults. Recognised tokens: permit_magic_link_for_password_users (allow magic-link login for accounts that also have a password — off by default because magic-link would weaken the password to mailbox-strength; OIDC-linked users are still refused regardless); auto_redirect_if_standalone_oidc (when OIDC is the only working login method, auto-redirect the login page to the IdP instead of showing a click-to-continue button — off by default to avoid redirect loops on IdP failure and preserve logout UX).
OXICLOUD_REQUIRE_VERIFIED_EMAIL	false	When true, POST /api/auth/login returns 403 EmailNotVerified for any account whose email_verified_at is NULL. Users can prove control by requesting a magic-link (whose redemption stamps email_verified_at), so this composes with magic_link in OXICLOUD_AUTH_METHODS to give users a self-service verification path. Admin-created (POST /api/admin/users) and setup-admin (POST /api/setup) users are auto-verified. OIDC-JIT users are also stamped verified at creation.

OPAQUE aPAKE (zero-knowledge password login)

OPAQUE (RFC 9807) is a zero-knowledge password-authenticated key exchange: the passphrase never leaves the client, not on registration and not on login. It's shipped in stages (see docs/plan/opaque.md); this build carries the substrate only — endpoints are inert until OXICLOUD_AUTH_OPAQUE_MODE is set. See docs/config/authentication.md for the phase rollout, the migration plan, and admin-facing guidance.

Variable	Default	Description
OXICLOUD_AUTH_OPAQUE_MODE	off	Runtime mode. off = endpoints 404 (default). migrate = endpoints live, legacy POST /api/auth/login still accepted. opaque_only = endpoints live, legacy refused for users with an envelope. Effective-mode cross-check: when password is not in OXICLOUD_AUTH_METHODS, the mode is auto-downgraded to off with an audit-channel INFO line (OPAQUE only replaces the password path — nothing to shadow in an OIDC-only or magic-link-only deployment). So OIDC / magic-link-only operators can safely ignore every OXICLOUD_AUTH_OPAQUE_* variable.
OXICLOUD_AUTH_OPAQUE_SERVER_SETUP	—	Base64-encoded ServerSetup blob. Required when OXICLOUD_AUTH_OPAQUE_MODE != off AND password is enabled — the server refuses to start with a helpful error otherwise. Generate once with the oxicloud-cli opaque setup subcommand and persist the value like your JWT secret. Never rotate — rotating invalidates every user's envelope (they'd all need to reset their passphrase).
OXICLOUD_AUTH_OPAQUE_KSF_MEMORY_KIB	47104	Client-side Argon2id memory cost in KiB (46 MiB — matches OWASP interactive-auth recommendation). Runs on the user's device during OPAQUE login/registration, TWICE per login. Distinct from OXICLOUD_HASH_MEMORY_COST (server-side legacy path). Bumping raises brute-force cost after a hypothetical envelope leak but also raises login latency and risks WASM heap OOM on low-memory devices — see authentication.md § OPAQUE — KSF parameters for the full rationale + per-device latency table.
OXICLOUD_AUTH_OPAQUE_KSF_ITERATIONS	1	Client-side Argon2id iteration count (OWASP interactive-auth recommendation).
OXICLOUD_AUTH_OPAQUE_KSF_PARALLELISM	1	Client-side Argon2id parallelism lanes (OWASP recommendation). Higher only helps on multi-core hardware and can hurt single-core / older mobile devices.

Rate Limiting & Account Lockout

Variable	Default	Description
OXICLOUD_RATE_LIMIT_LOGIN_MAX	10	Max login attempts per IP per window
OXICLOUD_RATE_LIMIT_LOGIN_WINDOW_SECS	60	Login rate-limit window (seconds)
OXICLOUD_RATE_LIMIT_REGISTER_MAX	5	Max registration attempts per IP per window
OXICLOUD_RATE_LIMIT_REGISTER_WINDOW_SECS	3600	Registration rate-limit window (seconds)
OXICLOUD_RATE_LIMIT_REFRESH_MAX	20	Max token refresh attempts per IP per window
OXICLOUD_RATE_LIMIT_REFRESH_WINDOW_SECS	60	Refresh rate-limit window (seconds)
OXICLOUD_LOCKOUT_MAX_FAILURES	5	Consecutive failed logins before account lockout
OXICLOUD_LOCKOUT_DURATION_SECS	900	Account lockout duration (15 minutes)

Feature Flags

Variable	Default	Description
OXICLOUD_ENABLE_AUTH	true	Enable authentication
OXICLOUD_ENABLE_USER_STORAGE_QUOTAS	false	Per-user storage quotas
OXICLOUD_ENABLE_FILE_SHARING	true	File/folder sharing
OXICLOUD_ENABLE_TRASH	true	Trash / recycle bin
OXICLOUD_ENABLE_SEARCH	true	Full-text and metadata search
OXICLOUD_ENABLE_MUSIC	true	Music playlists and audio metadata
OXICLOUD_EXPOSE_SYSTEM_USERS	true	Expose other OxiCloud users as a read-only address book at GET /api/address-books
OXICLOUD_GRANT_CLEANUP_ENABLED	true	Background daemon that deletes expired rows from storage.role_grants. The authorization engine already filters expired grants out of every permission check at read time (expires_at IS NULL OR expires_at > NOW()), so leaving expired rows in place is a hygiene issue — not a security one. This daemon garbage-collects them daily. Set to false to keep every expired grant row forever (uncommon; a fresh install rarely wants this).
OXICLOUD_GRANT_CLEANUP_GRACE_DAYS	15	Days past a grant's expires_at before the row is eligible for deletion. The grace window preserves the audit / support answer to "what happened to my access?" for a couple of weeks past expiration. Values below 1 are legal but discouraged — the recommendation is ≥ 15 days. Values above the actual grant TTL used by clients waste index space; a few weeks is the sweet spot.
OXICLOUD_GRANT_CLEANUP_INTERVAL_HOURS	24	How often the grant-cleanup daemon fires. Clamped to a minimum of 1 hour. Adjusting this doesn't change what gets deleted — only how promptly. Daily is fine for any realistic grant volume.
OXICLOUD_WEBDAV_DRIVE_LISTING_PREFIX	@drive	Native WebDAV URL segment that renders the caller's drive list. Sanitized by trimming leading/trailing /. Three shapes: (1) default @drive — /webdav/… addresses the caller's default personal drive (back-compat), /webdav/@drive/ returns the drive listing, /webdav/@drive/<uuid|name>/… targets a specific drive. (2) empty string "" — /webdav/ IS the drive listing, /webdav/<uuid|name>/… targets a specific drive, no default-drive shortcut. (3) any other string (e.g. drives) — same shape as @drive with that segment substituted. Only drives the caller has Read on via role_grants resolve.

Storage Entries (multi-entry, recommended)

Declare one or more named storage backends. The one the app runs on is picked from the DB (admin_settings.storage.active_backend_name); the admin panel's storage tab flips the pointer, and cross-backend migration is a recoverable job that copies blobs between two entries with a read-only safety window. See Admin Settings — Storage & Migration for the operator flow and the multi-entry design doc for the full model.

Variable	Default	Description
OXICLOUD_STORAGE_ENTRIES	—	Comma-separated allowlist of entry names. Names must match [a-z0-9_-]{1,32} and be unique. Order is preserved (the first entry is the fallback when the DB pointer is unset — fresh install).

Each declared name <N> then reads its own set of per-entry variables:

Variable	Default	Description
OXICLOUD_STORAGE_<N>_BACKEND	—	Backend type for entry <N>: local | s3 | azure (required per entry)
OXICLOUD_STORAGE_<N>_ROOT_DIR	OXICLOUD_STORAGE_PATH	Local-only: root directory for this entry's .blobs/. Falls back to the ambient OXICLOUD_STORAGE_PATH when unset.
OXICLOUD_STORAGE_<N>_S3_BUCKET	—	S3-only: bucket name (required when backend=s3)
OXICLOUD_STORAGE_<N>_S3_REGION	us-east-1	S3-only: AWS region
OXICLOUD_STORAGE_<N>_S3_ENDPOINT_URL	—	S3-only: custom endpoint for non-AWS providers
OXICLOUD_STORAGE_<N>_S3_ACCESS_KEY	—	S3-only: access key ID
OXICLOUD_STORAGE_<N>_S3_SECRET_KEY	—	S3-only: secret access key
OXICLOUD_STORAGE_<N>_S3_FORCE_PATH_STYLE	false	S3-only: path-style URLs (required for MinIO, R2)
OXICLOUD_STORAGE_<N>_AZURE_ACCOUNT_NAME	—	Azure-only: storage account name
OXICLOUD_STORAGE_<N>_AZURE_ACCOUNT_KEY	—	Azure-only: storage account key
OXICLOUD_STORAGE_<N>_AZURE_CONTAINER	—	Azure-only: blob container name (required when backend=azure)
OXICLOUD_STORAGE_<N>_AZURE_SAS_TOKEN	—	Azure-only: SAS token (alternative to account key)
OXICLOUD_STORAGE_<N>_AZURE_ENDPOINT_URL	—	Azure-only: custom endpoint (Azurite, private deployments)
OXICLOUD_STORAGE_<N>_ENCRYPTION_KEY	—	Comma-separated list of <cipher>:<base64 key> pairs (or bare <base64 key>, which defaults to aes-256-gcm). Presence implies encryption is enabled on this entry — no separate enable flag. The LAST pair wins on writes; every pair is a candidate for reads. Supported ciphers: aes-256-gcm and none (empty-key sentinel used at pair-list head/tail for encrypt/decrypt-in-place rotations). Bad base64, wrong length, duplicate keys, or multiple none pairs abort boot. See Storage key rotation for rotation recipes.

Fail-fast rules (boot aborts with actionable message):

• A declared name whose required per-entry fields are missing (_BACKEND never set, S3 with no _S3_BUCKET, Azure with no _AZURE_CONTAINER).
• Setting OXICLOUD_STORAGE_ENTRIES alongside any of the legacy flat vars below (OXICLOUD_STORAGE_BACKEND, OXICLOUD_S3_*, OXICLOUD_AZURE_*, OXICLOUD_STORAGE_ENCRYPTION_*). Pick one mode; the error lists every conflicting var to remove.
• A DB pointer (admin_settings.storage.active_backend_name) that names an entry not in the current _ENTRIES. The error points at the repair flag oxicloud --select-storage <name> — verify + UPDATE DB + exit.

Example — two entries, local disk plus an S3 target for planned migration:

OXICLOUD_STORAGE_ENTRIES=local_main,s3_prod

OXICLOUD_STORAGE_local_main_BACKEND=local
OXICLOUD_STORAGE_local_main_ROOT_DIR=/srv/oxicloud

OXICLOUD_STORAGE_s3_prod_BACKEND=s3
OXICLOUD_STORAGE_s3_prod_S3_BUCKET=my-oxicloud-bucket
OXICLOUD_STORAGE_s3_prod_S3_REGION=us-east-1
OXICLOUD_STORAGE_s3_prod_S3_ACCESS_KEY=…
OXICLOUD_STORAGE_s3_prod_S3_SECRET_KEY=…
OXICLOUD_STORAGE_s3_prod_ENCRYPTION_KEY=aes-256-gcm:…  # openssl rand -base64 32

# Rotation window (two pairs, last wins on writes):
# OXICLOUD_STORAGE_s3_prod_ENCRYPTION_KEY=aes-256-gcm:<OLD>,aes-256-gcm:<NEW>

Storage Backend (DEPRECATED — legacy single-backend)

⚠️ Deprecated. Use Storage Entries above for new deployments. These flat variables still work when OXICLOUD_STORAGE_ENTRIES is unset — the parser then synthesises one entry named default from them, keeping pre-multi-entry .env files booting unchanged. Booting via this path emits a storage.legacy_flat_vars_deprecated warning so operators see it in logs. Removal target: not yet fixed; migrate at your convenience by moving each variable below into OXICLOUD_STORAGE_<NAME>_* form under an entry declared in OXICLOUD_STORAGE_ENTRIES. Setting any variable from this section alongside OXICLOUD_STORAGE_ENTRIES is a fail-fast boot error — pick one mode.

Variable	Default	Description
OXICLOUD_STORAGE_BACKEND	local	Blob storage backend: local, s3, or azure

S3-Compatible (AWS S3, Backblaze B2, Cloudflare R2, MinIO)

Used when OXICLOUD_STORAGE_BACKEND=s3.

Variable	Default	Description
OXICLOUD_S3_BUCKET	—	S3 bucket name (required)
OXICLOUD_S3_REGION	us-east-1	AWS region
OXICLOUD_S3_ACCESS_KEY	—	Access key ID
OXICLOUD_S3_SECRET_KEY	—	Secret access key
OXICLOUD_S3_ENDPOINT_URL	—	Custom endpoint for non-AWS providers (e.g. https://s3.example.com)
OXICLOUD_S3_FORCE_PATH_STYLE	false	Force path-style URLs (required for MinIO, R2)

Azure Blob Storage

Used when OXICLOUD_STORAGE_BACKEND=azure.

Variable	Default	Description
OXICLOUD_AZURE_ACCOUNT_NAME	—	Storage account name (required)
OXICLOUD_AZURE_ACCOUNT_KEY	—	Storage account key
OXICLOUD_AZURE_CONTAINER	—	Blob container name (required)
OXICLOUD_AZURE_SAS_TOKEN	—	SAS token (alternative to account key)

Local Disk Cache for Remote Backends

A least-recently-used disk cache that can speed up repeated reads from S3 or Azure.

Variable	Default	Description
OXICLOUD_STORAGE_CACHE_ENABLED	false	Enable LRU disk cache
OXICLOUD_STORAGE_CACHE_MAX_SIZE	53687091200	Max cache size in bytes (50 GB)
OXICLOUD_STORAGE_CACHE_PATH	{STORAGE_PATH}/.blob-cache	Cache directory

Client-Side Encryption (DEPRECATED — per-entry key is the new home)

AES-256-GCM encryption applied to blobs before they are written to any backend.

⚠️ Deprecated. Prefer per-entry OXICLOUD_STORAGE_<NAME>_ENCRYPTION_KEY under an entry declared in OXICLOUD_STORAGE_ENTRIES — presence of the key implies encryption is enabled on that entry (no separate flag), and multi-entry enables cross-key rotation via migration to a new entry. The flat vars below still work in zero-entries mode and get folded into the synthesised default entry, alongside the same deprecation warning at boot.

Variable	Default	Description
OXICLOUD_STORAGE_ENCRYPTION_ENABLED	false	Enable at-rest blob encryption
OXICLOUD_STORAGE_ENCRYPTION_KEY	—	Base64-encoded 32-byte encryption key; generate with openssl rand -base64 32

Retry Policy (Remote Backends)

Exponential backoff retries for transient errors on S3 and Azure.

Variable	Default	Description
OXICLOUD_STORAGE_RETRY_ENABLED	true	Enable retry with exponential backoff
OXICLOUD_STORAGE_RETRY_MAX_RETRIES	3	Maximum retry attempts
OXICLOUD_STORAGE_RETRY_INITIAL_BACKOFF_MS	100	Initial backoff in milliseconds
OXICLOUD_STORAGE_RETRY_MAX_BACKOFF_MS	10000	Maximum backoff cap in milliseconds
OXICLOUD_STORAGE_RETRY_BACKOFF_MULTIPLIER	2.0	Backoff multiplier per retry

OIDC / SSO

See the OIDC configuration guide for details.

Variable	Default	Description
OXICLOUD_OIDC_ENABLED	false	Enable OIDC
OXICLOUD_OIDC_ISSUER_URL	—	OIDC issuer URL
OXICLOUD_OIDC_CLIENT_ID	—	Client ID
OXICLOUD_OIDC_CLIENT_SECRET	—	Client secret
OXICLOUD_OIDC_REDIRECT_URI	http://localhost:8086/api/auth/oidc/callback	Callback URL (must match IdP config)
OXICLOUD_OIDC_SCOPES	openid profile email	Requested scopes
OXICLOUD_OIDC_FRONTEND_URL	http://localhost:8086	Frontend URL to redirect to after login
OXICLOUD_OIDC_AUTO_PROVISION	true	Auto-create users on first SSO login (JIT provisioning)
OXICLOUD_OIDC_ADMIN_GROUPS	—	Comma-separated OIDC groups that grant admin role
OXICLOUD_OIDC_DISABLE_PASSWORD_LOGIN	false	DEPRECATED — emits boot warning; slated for removal in next major release. Use OXICLOUD_AUTH_METHODS=oidc (and optionally OXICLOUD_AUTH_POLICIES=auto_redirect_if_standalone_oidc for server-side /login redirect) instead. Still removes password from the effective allowlist when set to true — kept working so upgrading deployments don't break.
OXICLOUD_OIDC_PROVIDER_NAME	SSO	Display name for the provider shown in UI

WOPI (Office Editing)

See the WOPI configuration guide for details.

Variable	Default	Description
OXICLOUD_WOPI_ENABLED	false	Enable WOPI
OXICLOUD_WOPI_DISCOVERY_URL	—	Collabora/OnlyOffice discovery URL
OXICLOUD_WOPI_BASE_URL	OXICLOUD_BASE_URL	URL the editor uses to call OxiCloud's /wopi/* endpoints
OXICLOUD_WOPI_PUBLIC_BASE_URL	OXICLOUD_WOPI_BASE_URL	URL the browser uses to open OxiCloud's WOPI host page
OXICLOUD_WOPI_SECRET	(JWT secret)	WOPI token signing key
OXICLOUD_WOPI_TOKEN_TTL_SECS	86400	Token lifetime (24 hours)
OXICLOUD_WOPI_LOCK_TTL_SECS	1800	Lock expiration (30 minutes)

When Collabora or OnlyOffice runs on a different hostname, set OXICLOUD_WOPI_PUBLIC_BASE_URL to the public OxiCloud URL that the browser can reach. If the editor reaches OxiCloud through a different internal URL, also set OXICLOUD_WOPI_BASE_URL for those callbacks.

Nextcloud Compatibility

Enables the Nextcloud-compatible API layer (/remote.php/, /ocs/, /status.php, Login Flow v2) for clients that use the Nextcloud protocol.

Variable	Default	Description
OXICLOUD_NEXTCLOUD_ENABLED	false	Enable Nextcloud compatibility layer
OXICLOUD_NEXTCLOUD_INSTANCE_ID	ocnca	Instance ID suffix used in oc:id formatting
OXICLOUD_NEXTCLOUD_VERSION	28.0.4	Emulated Nextcloud version reported to clients (format: major.minor.patch)

Outbound Email (SMTP)

Used by the magic-link invitation flow and the login-via-email flow. When OXICLOUD_SMTP_HOST is empty (the default), the feature is disabled and any endpoint that needs email returns 503.

Variable	Default	Description
OXICLOUD_SMTP_HOST	—	SMTP server hostname or IP. Empty disables the feature.
OXICLOUD_SMTP_PORT	587	Submission port (587 STARTTLS, 465 implicit TLS, 25 plain)
OXICLOUD_SMTP_USER	—	SASL username. Leave empty for anonymous relay.
OXICLOUD_SMTP_PASS	—	SASL password
OXICLOUD_SMTP_FROM	—	From: mailbox; bare address or RFC 5322 name-address (OxiCloud <noreply@example.com>)
OXICLOUD_SMTP_TLS	starttls	Transport encryption: starttls, tls, or none (emits startup WARN)

There is also OXICLOUD_SMTP_MOCK (false by default), this is for test purpose only, do not activate it

Reliability and retries

OxiCloud does not spool mail. Each send() is a single attempt: if the remote SMTP server is unreachable, slow, or temporarily refusing the message, the send fails and the error is logged — there is no in-process retry, queue, or dead-letter handling. This keeps the HTTP path fast and the binary small at the cost of durability guarantees during a relay outage.

For production deployments where you cannot afford to drop invitation mail during a brief relay outage, point OxiCloud at a local MTA configured as a smarthost (Postfix, OpenSMTPD, exim, or msmtp-mta/nullmailer for minimal setups). The local MTA owns the durable queue: it accepts the message from OxiCloud in milliseconds over the loopback, then retries with its own exponential backoff against your real upstream relay until the message is delivered or the queue lifetime expires.

Typical local-relay config:

OXICLOUD_SMTP_HOST=127.0.0.1
OXICLOUD_SMTP_PORT=25
OXICLOUD_SMTP_TLS=none           # loopback only — never over the network
OXICLOUD_SMTP_FROM=OxiCloud <noreply@example.com>
# OXICLOUD_SMTP_USER / _PASS unset — local MTA accepts loopback unauthenticated

Then configure the local MTA's smarthost / relayhost to your upstream provider (SendGrid, Amazon SES, your corporate relay, etc.). Verify durability by stopping the upstream relay, sending an invitation, restarting the relay, and confirming the mail eventually arrives.

If you point OXICLOUD_SMTP_HOST directly at a remote SMTP server, treat the absence of retries as a documented constraint: a brief network glitch during invitation flow is a lost invite, and the recipient will need to be re-invited.

Magic-Link Authentication

Configures the invite-by-email and login-via-email flows. Both require SMTP to be configured above.

Variable	Default	Description
OXICLOUD_MAGIC_LINK_TTL_HOURS	24	Lifetime of a freshly-minted magic-link token, in hours
OXICLOUD_ALLOW_EXTERNAL_USERS	true	Kill switch for the whole flow. false makes POST /api/grants reject subject.type = "email" for unknown addresses and POST /api/auth/magic-link/send return its uniform stub without issuing a token.
OXICLOUD_EXTERNAL_EMAIL_DOMAINS	—	Comma-separated allowlist of email domains accepted when minting a new external user (case-insensitive, exact match on the post-@ part). Empty = any domain is allowed, subject to OXICLOUD_ALLOW_EXTERNAL_USERS. Subdomains must be listed explicitly: partner.com does NOT match eng.partner.com. Example: partner-a.com,partner-b.io.
OXICLOUD_NOTIFY_INTERNAL_USERS_ON_SHARE	true	Operator-level kill switch for the plain-notification email arm — the "Alice shared 'Project Alpha' with you" mail that fires when the recipient is a password user or OIDC user (i.e. not magic-link eligible). false suppresses the arm entirely; internal users discover new shares only at next login. A coarser knob than the per-user auth.users.notify_on_share column; when this is false the user-level opt-in does not matter. External-user magic-link first-invitations are unaffected and always send.

Internationalization (server-rendered surfaces)

Server-rendered HTML pages (magic-link landing, error pages) and outbound transactional emails go through the backend i18n layer. The set of available locales is discovered at boot by listing static/locales/*.json — no rebuild needed to add a 17th locale.

Variable	Default	Description
OXICLOUD_DEFAULT_LOCALE	en	Fallback locale used when no stronger signal is available. Must match one of the locales under static/locales/; startup fails fast if you set it to a code with no corresponding JSON file.

The resolution priority differs by surface:

• HTML pages (anonymous, e.g. magic-link landing) — ?lang=xx query override, then the browser's Accept-Language header (q-weighted, with primary-tag fallback so fr-FR resolves to fr when no fr-FR.json is shipped), then this default.
• Emails to a known user — the user's preferred_locale column (set via OIDC locale claim at JIT or via the UI language switcher), then this default.
• Emails to a brand-new external user being invited — the inviter's preferred_locale (inheritance at row-creation), then this default.

Today's shipped locales: ar, de, en, es, fa, fr, hi, it, ja, ko, nl, pl, pt, ru, zh, zh-TW. Missing translations on a non-English locale automatically fall back to English at the key level — adding a new locale with even a few translated keys works without manual gap-filling.

Trusted Proxy

Variable	Default	Description
OXICLOUD_TRUST_PROXY_CIDR	—	Comma-separated list of trusted proxy CIDRs; enables X-Forwarded-For / X-Real-IP extraction for those source IPs
OXICLOUD_TRUST_PROXY_HEADERS	—	Deprecated. Use OXICLOUD_TRUST_PROXY_CIDR instead

Example: OXICLOUD_TRUST_PROXY_CIDR=127.0.0.1/32,10.0.0.0/8,172.16.0.0/12

Allocator Tuning

These variables are read directly by mimalloc, not by OxiCloud's config parser.

Variable	Default	Description
MIMALLOC_PURGE_DELAY	0	Delay in ms before freed memory is returned to the OS (0 = immediately, recommended for Docker)
MIMALLOC_ALLOW_LARGE_OS_PAGES	0	Enable 2 MiB huge pages (0 = off, recommended for Docker to avoid THP RSS inflation)

Internal Defaults (not configurable via env)

Parameter	Default
File cache TTL	60 s
Directory cache TTL	120 s
Max cache entries	10 000
Large file threshold	100 MB
Streaming chunk size	1 MB
Max parallel chunks	8
Trash retention	30 days
Argon2id memory cost	64 MiB
Argon2id time cost	3 iterations
Nextcloud Login Flow v2 TTL	600 s