feat: Readded support for reading registration tokens from a file

Co-authored-by: Ginger <ginger@gingershaped.computer>

conduwuit-example.toml

@@ -476,18 +476,23 @@
 #yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse = false
 
 # A static registration token that new users will have to provide when
-# creating an account. If unset and `allow_registration` is true,
-# you must set
-# `yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse`
-# to true to allow open registration without any conditions.
-#
-# If you do not want to set a static token, the `!admin token` commands
-# may also be used to manage registration tokens.
+# creating an account. This token does not supersede tokens from other sources, such as the `!admin token`
+# command or the `registration_token_file` configuration option.
 #
 # example: "o&^uCtes4HPf0Vu@F20jQeeWE7"
 #
 #registration_token =
 
+# A path to a file containing static registration tokens, one per line.
+# Tokens in this file do not supersede tokens from other sources, such as the `!admin token`
+# command or the `registration_token` configuration option.
+#
+# The file will be read once, when Continuwuity starts. It is not currently reread
+# when the server configuration is reloaded. If the file cannot be read, Continuwuity
+# will fail to start.
+#
+#registration_token_file =
+
 # The public site key for reCaptcha. If this is provided, reCaptcha
 # becomes required during registration. If both captcha *and*
 # registration token are enabled, both will be required during

src/core/config/check.rs

@@ -174,6 +174,7 @@ pub fn check(config: &Config) -> Result {
 	if config.allow_registration
 		&& config.yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse
 		&& config.registration_token.is_none()
+		&& config.registration_token_file.is_none()
 	{
 		warn!(
 			"Open registration is enabled via setting \

src/core/config/mod.rs

@@ -609,19 +609,25 @@ pub struct Config {
 	pub yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse: bool,
 
 	/// A static registration token that new users will have to provide when
-	/// creating an account. If unset and `allow_registration` is true,
-	/// you must set
-	/// `yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse`
-	/// to true to allow open registration without any conditions.
-	///
-	/// If you do not want to set a static token, the `!admin token` commands
-	/// may also be used to manage registration tokens.
+	/// creating an account. This token does not supersede tokens from other
+	/// sources, such as the `!admin token` command or the
+	/// `registration_token_file` configuration option.
 	///
 	/// example: "o&^uCtes4HPf0Vu@F20jQeeWE7"
 	///
 	/// display: sensitive
 	pub registration_token: Option<String>,
 
+	/// A path to a file containing static registration tokens, one per line.
+	/// Tokens in this file do not supersede tokens from other sources, such as
+	/// the `!admin token` command or the `registration_token` configuration
+	/// option.
+	///
+	/// The file will be read once, when Continuwuity starts. It is not
+	/// currently reread when the server configuration is reloaded. If the file
+	/// cannot be read, Continuwuity will fail to start.
+	pub registration_token_file: Option<PathBuf>,
+
 	/// The public site key for reCaptcha. If this is provided, reCaptcha
 	/// becomes required during registration. If both captcha *and*
 	/// registration token are enabled, both will be required during

src/service/config/mod.rs

@@ -19,10 +19,9 @@ impl Service {
 	/// Get the registration token set in the config file, if it exists.
 	#[must_use]
 	pub fn get_config_file_token(&self) -> Option<ValidToken> {
-		self.registration_token.clone().map(|token| ValidToken {
-			token,
-			source: ValidTokenSource::ConfigFile,
-		})
+		self.registration_token
+			.clone()
+			.map(|token| ValidToken { token, source: ValidTokenSource::Config })
 	}
 }
 

src/service/registration_tokens/mod.rs

@@ -2,7 +2,7 @@ mod data;
 
 use std::{future::ready, pin::Pin, sync::Arc};
 
-use conduwuit::{Err, Result, utils};
+use conduwuit::{Err, Result, err, utils};
 use data::Data;
 pub use data::{DatabaseTokenInfo, TokenExpires};
 use futures::{
@@ -18,6 +18,9 @@ const RANDOM_TOKEN_LENGTH: usize = 16;
 pub struct Service {
 	db: Data,
 	services: Services,
+	/// The registration tokens which were read from the registration token
+	/// file, if one is configured.
+	registration_tokens_from_file: Vec<String>,
 }
 
 struct Services {
@@ -45,34 +48,54 @@ impl PartialEq<str> for ValidToken {
 /// The source of a valid database token.
 #[derive(Debug)]
 pub enum ValidTokenSource {
-	/// The static token set in the homeserver's config file, which is
-	/// always valid.
-	ConfigFile,
+	/// The static token set in the homeserver's config file.
+	Config,
 	/// A database token which has been checked to be valid.
 	Database(DatabaseTokenInfo),
 	/// The single-use token which may be used to create the homeserver's first
 	/// account.
 	FirstAccount,
+	/// A registration token read from the registration token file set in the
+	/// config.
+	TokenFile,
 }
 
 impl std::fmt::Display for ValidTokenSource {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		match self {
-			| Self::ConfigFile => write!(f, "Token defined in config."),
+			| Self::Config => write!(f, "Static token set in the server configuration."),
 			| Self::Database(info) => info.fmt(f),
 			| Self::FirstAccount => write!(f, "Initial setup token."),
+			| Self::TokenFile => write!(f, "Static token set in the registration token file."),
 		}
 	}
 }
 
 impl crate::Service for Service {
 	fn build(args: crate::Args<'_>) -> Result<Arc<Self>> {
+		let registration_tokens_from_file = args.server.config.registration_token_file
+			.clone()
+			// If the token file option was set, read the path it points to
+			.map(std::fs::read_to_string)
+			.transpose()
+			.map_err(|err| err!("Failed to read registration token file: {err}"))
+			.map(|tokens| {
+				if let Some(tokens) = tokens {
+					// If the token file option was set, return the file's lines as tokens
+					tokens.lines().map(ToOwned::to_owned).collect()
+				} else {
+					// Otherwise, if the option wasn't set, return no tokens
+					vec![]
+				}
+			})?;
+
 		Ok(Arc::new(Self {
 			db: Data::new(args.db),
 			services: Services {
 				config: args.depend::<config::Service>("config"),
 				firstrun: args.depend::<firstrun::Service>("firstrun"),
 			},
+			registration_tokens_from_file,
 		}))
 	}
 
@@ -97,12 +120,23 @@ impl Service {
 		(token, info)
 	}
 
-	/// Get all the "special" registration tokens that aren't defined in the
+	/// Get all the static registration tokens that aren't defined in the
 	/// database.
 	fn iterate_static_tokens(&self) -> impl Iterator<Item = ValidToken> {
-		// This does not include the first-account token, because it's special:
-		// no other registration tokens are valid when it is set.
-		self.services.config.get_config_file_token().into_iter()
+		// This does not include the first-account token, because it has special
+		// behavior: no other registration tokens are valid when it is set.
+		self.services
+			.config
+			.get_config_file_token()
+			.into_iter()
+			.chain(
+				self.registration_tokens_from_file
+					.iter()
+					.map(|token_string| ValidToken {
+						token: token_string.clone(),
+						source: ValidTokenSource::TokenFile,
+					}),
+			)
 	}
 
 	/// Validate a registration token.
@@ -158,7 +192,7 @@ impl Service {
 	/// revoked.
 	pub fn revoke_token(&self, ValidToken { token, source }: ValidToken) -> Result {
 		match source {
-			| ValidTokenSource::ConfigFile => {
+			| ValidTokenSource::Config => {
 				Err!(
 					"The token set in the config file cannot be revoked. Edit the config file \
 					 to change it."
@@ -171,6 +205,12 @@ impl Service {
 			| ValidTokenSource::FirstAccount => {
 				Err!("The initial setup token cannot be revoked.")
 			},
+			| ValidTokenSource::TokenFile => {
+				Err!(
+					"Tokens set in the registration token file cannot be revoked. Edit the \
+					 registration token file and restart Continuwuity to change them."
+				)
+			},
 		}
 	}