refactor: [#591] order keys in config TOML files alphabetically

We should produce always the same TOML file from the same configuration
deterministically.

src/config/mod.rs

@@ -347,11 +347,11 @@ mod tests {
                                 name = "Torrust"
 
                                 [tracker]
-                                url = "udp://localhost:6969"
-                                mode = "public"
                                 api_url = "http://localhost:1212/"
+                                mode = "public"
                                 token = "MyAccessToken"
                                 token_valid_seconds = 7257600
+                                url = "udp://localhost:6969"
 
                                 [net]
                                 bind_address = "0.0.0.0:3001"
@@ -361,9 +361,9 @@ mod tests {
                                 secret_key = "MaxVerstappenWC2021"
 
                                 [auth.password_constraints]
-                                min_password_length = 6
                                 max_password_length = 64
-                                
+                                min_password_length = 6
+
                                 [database]
                                 connect_url = "sqlite://data.db?mode=rwc"
 
@@ -381,19 +381,19 @@ mod tests {
                                 username = ""
 
                                 [image_cache]
-                                max_request_timeout_ms = 1000
                                 capacity = 128000000
                                 entry_size_limit = 4000000
-                                user_quota_period_seconds = 3600
+                                max_request_timeout_ms = 1000
                                 user_quota_bytes = 64000000
+                                user_quota_period_seconds = 3600
 
                                 [api]
                                 default_torrent_page_size = 10
                                 max_torrent_page_size = 30
 
                                 [tracker_statistics_importer]
-                                torrent_info_update_interval = 3600
                                 port = 3002
+                                torrent_info_update_interval = 3600
         "#
         .lines()
         .map(str::trim_start)

src/config/v1/api.rs

@@ -6,6 +6,7 @@ pub struct Api {
     /// The default page size for torrent lists.
     #[serde(default = "Api::default_default_torrent_page_size")]
     pub default_torrent_page_size: u8,
+
     /// The maximum page size for torrent lists.
     #[serde(default = "Api::default_max_torrent_page_size")]
     pub max_torrent_page_size: u8,

src/config/v1/auth.rs

@@ -9,9 +9,11 @@ pub struct Auth {
     /// Whether or not to require an email on signup.
     #[serde(default = "Auth::default_email_on_signup")]
     pub email_on_signup: EmailOnSignup,
+
     /// The secret key used to sign JWT tokens.
     #[serde(default = "Auth::default_secret_key")]
     pub secret_key: SecretKey,
+
     /// The password constraints
     #[serde(default = "Auth::default_password_constraints")]
     pub password_constraints: PasswordConstraints,
@@ -117,19 +119,19 @@ impl fmt::Display for SecretKey {
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct PasswordConstraints {
-    /// The minimum password length.
-    #[serde(default = "PasswordConstraints::default_min_password_length")]
-    pub min_password_length: usize,
     /// The maximum password length.
     #[serde(default = "PasswordConstraints::default_max_password_length")]
     pub max_password_length: usize,
+    /// The minimum password length.
+    #[serde(default = "PasswordConstraints::default_min_password_length")]
+    pub min_password_length: usize,
 }
 
 impl Default for PasswordConstraints {
     fn default() -> Self {
         Self {
-            min_password_length: Self::default_min_password_length(),
             max_password_length: Self::default_max_password_length(),
+            min_password_length: Self::default_min_password_length(),
         }
     }
 }

src/config/v1/image_cache.rs

@@ -10,23 +10,27 @@ use serde::{Deserialize, Serialize};
 #[allow(clippy::module_name_repetitions)]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct ImageCache {
-    /// Maximum time in seconds to wait for downloading the image form the original source.
-    #[serde(default = "ImageCache::default_max_request_timeout_ms")]
-    pub max_request_timeout_ms: u64,
     /// Cache size in bytes.
     #[serde(default = "ImageCache::default_capacity")]
     pub capacity: usize,
+
     /// Maximum size in bytes for a single image.
     #[serde(default = "ImageCache::default_entry_size_limit")]
     pub entry_size_limit: usize,
-    /// Users have a cache quota per period. For example: 100MB per day.
-    /// This is the period in seconds (1 day in seconds).
-    #[serde(default = "ImageCache::default_user_quota_period_seconds")]
-    pub user_quota_period_seconds: u64,
+
+    /// Maximum time in seconds to wait for downloading the image form the original source.
+    #[serde(default = "ImageCache::default_max_request_timeout_ms")]
+    pub max_request_timeout_ms: u64,
+
     /// Users have a cache quota per period. For example: 100MB per day.
     /// This is the maximum size in bytes (100MB in bytes).    
     #[serde(default = "ImageCache::default_user_quota_bytes")]
     pub user_quota_bytes: usize,
+
+    /// Users have a cache quota per period. For example: 100MB per day.
+    /// This is the period in seconds (1 day in seconds).
+    #[serde(default = "ImageCache::default_user_quota_period_seconds")]
+    pub user_quota_period_seconds: u64,
 }
 
 impl Default for ImageCache {

src/config/v1/mail.rs

@@ -7,12 +7,15 @@ pub struct Mail {
     /// Whether or not to enable email verification on signup.
     #[serde(default = "Mail::default_email_verification_enabled")]
     pub email_verification_enabled: bool,
+
     /// The email address to send emails from.
     #[serde(default = "Mail::default_from")]
     pub from: Mailbox,
+
     /// The email address to reply to.
     #[serde(default = "Mail::default_reply_to")]
     pub reply_to: Mailbox,
+
     /// The SMTP server configuration.
     #[serde(default = "Mail::default_smtp")]
     pub smtp: Smtp,

src/config/v1/mod.rs

@@ -29,30 +29,39 @@ pub struct Settings {
     /// The logging configuration.
     #[serde(default)]
     pub logging: Logging,
+
     /// The website customizable values.
     #[serde(default)]
     pub website: Website,
+
     /// The tracker configuration.
     #[serde(default)]
     pub tracker: Tracker,
+
     /// The network configuration.
     #[serde(default)]
     pub net: Network,
+
     /// The authentication configuration.
     #[serde(default)]
     pub auth: Auth,
+
     /// The database configuration.
     #[serde(default)]
     pub database: Database,
+
     /// The SMTP configuration.
     #[serde(default)]
     pub mail: Mail,
+
     /// The image proxy cache configuration.
     #[serde(default)]
     pub image_cache: ImageCache,
+
     /// The API configuration.
     #[serde(default)]
     pub api: Api,
+
     /// The tracker statistics importer job configuration.
     #[serde(default)]
     pub tracker_statistics_importer: TrackerStatisticsImporter,

src/config/v1/net.rs

@@ -17,12 +17,14 @@ pub struct Network {
     /// If not set, the base URL will be inferred from the request.
     #[serde(default = "Network::default_base_url")]
     pub base_url: Option<Url>,
+
     /// The address the tracker will bind to.
     /// The format is `ip:port`, for example `0.0.0.0:6969`. If you want to
     /// listen to all interfaces, use `0.0.0.0`. If you want the operating
     /// system to choose a random port, use port `0`.
     #[serde(default = "Network::default_bind_address")]
     pub bind_address: SocketAddr,
+
     /// TSL configuration.
     #[serde(default = "Network::default_tsl")]
     pub tsl: Option<Tsl>,

src/config/v1/tracker.rs

@@ -9,23 +9,27 @@ use crate::config::TrackerMode;
 /// Configuration for the associated tracker.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct Tracker {
-    /// Connection string for the tracker. For example: `udp://TRACKER_IP:6969`.
-    #[serde(default = "Tracker::default_url")]
-    pub url: Url,
+    /// The url of the tracker API. For example: `http://localhost:1212/`.
+    #[serde(default = "Tracker::default_api_url")]
+    pub api_url: Url,
+
     /// The mode of the tracker. For example: `Public`.
     /// See `TrackerMode` in [`torrust-tracker-primitives`](https://docs.rs/torrust-tracker-primitives)
     /// crate for more information.
     #[serde(default = "Tracker::default_mode")]
     pub mode: TrackerMode,
-    /// The url of the tracker API. For example: `http://localhost:1212/`.
-    #[serde(default = "Tracker::default_api_url")]
-    pub api_url: Url,
+
     /// The token used to authenticate with the tracker API.
     #[serde(default = "Tracker::default_token")]
     pub token: ApiToken,
+
     /// The amount of seconds the tracker API token is valid.
     #[serde(default = "Tracker::default_token_valid_seconds")]
     pub token_valid_seconds: u64,
+
+    /// Connection string for the tracker. For example: `udp://TRACKER_IP:6969`.
+    #[serde(default = "Tracker::default_url")]
+    pub url: Url,
 }
 
 impl Validator for Tracker {

src/config/v1/tracker_statistics_importer.rs

@@ -3,12 +3,13 @@ use serde::{Deserialize, Serialize};
 /// Configuration for the tracker statistics importer.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct TrackerStatisticsImporter {
-    /// The interval in seconds to get statistics from the tracker.
-    #[serde(default = "TrackerStatisticsImporter::default_torrent_info_update_interval")]
-    pub torrent_info_update_interval: u64,
     /// The port the Importer API is listening on. Default to `3002`.
     #[serde(default = "TrackerStatisticsImporter::default_port")]
     pub port: u16,
+
+    /// The interval in seconds to get statistics from the tracker.
+    #[serde(default = "TrackerStatisticsImporter::default_torrent_info_update_interval")]
+    pub torrent_info_update_interval: u64,
 }
 
 impl Default for TrackerStatisticsImporter {