Emit warning when no 'secret_key' is set in prod.

lib/src/config/custom_values.rs

@@ -14,17 +14,26 @@ pub enum SecretKey {
 
 impl SecretKey {
     #[inline]
-    pub fn kind(&self) -> &'static str {
+    pub(crate) fn inner(&self) -> &Key {
         match *self {
-            SecretKey::Generated(_) => "generated",
+            SecretKey::Generated(ref key) | SecretKey::Provided(ref key) => key
-            SecretKey::Provided(_) => "provided",
         }
     }
 
     #[inline]
-    pub(crate) fn inner(&self) -> &Key {
+    pub(crate) fn is_generated(&self) -> bool {
         match *self {
-            SecretKey::Generated(ref key) | SecretKey::Provided(ref key) => key
+            SecretKey::Generated(_) => true,
+            _ => false
+        }
+    }
+}
+
+impl fmt::Display for SecretKey {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            SecretKey::Generated(_) => write!(f, "generated"),
+            SecretKey::Provided(_) => write!(f, "provided"),
         }
     }
 }

lib/src/config/environment.rs

@@ -19,6 +19,62 @@ pub enum Environment {
     Production,
 }
 
+impl Environment {
+    /// Returns `true` if `self` is `Environment::Development`.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// use rocket::config::Environment;
+    ///
+    /// assert!(Environment::Development.is_dev());
+    /// assert!(!Environment::Production.is_dev());
+    /// ```
+    #[inline]
+    pub fn is_dev(self) -> bool {
+        match self {
+            Development => true,
+            _ => false
+        }
+    }
+
+    /// Returns `true` if `self` is `Environment::Staging`.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// use rocket::config::Environment;
+    ///
+    /// assert!(Environment::Staging.is_stage());
+    /// assert!(!Environment::Production.is_stage());
+    /// ```
+    #[inline]
+    pub fn is_stage(self) -> bool {
+        match self {
+            Staging => true,
+            _ => false
+        }
+    }
+
+    /// Returns `true` if `self` is `Environment::Production`.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// use rocket::config::Environment;
+    ///
+    /// assert!(Environment::Production.is_prod());
+    /// assert!(!Environment::Staging.is_prod());
+    /// ```
+    #[inline]
+    pub fn is_prod(self) -> bool {
+        match self {
+            Production => true,
+            _ => false
+        }
+    }
+}
+
 impl Environment {
     /// Retrieves the "active" environment as determined by the `ROCKET_ENV`
     /// environment variable. If `ROCKET_ENV` is not set, returns `Development`.

lib/src/rocket.rs

@@ -391,19 +391,21 @@ impl Rocket {
         info_!("port: {}", Paint::white(&config.port));
         info_!("log: {}", Paint::white(config.log_level));
         info_!("workers: {}", Paint::white(config.workers));
-        info_!("secret key: {}", Paint::white(config.secret_key.kind()));
+        info_!("secret key: {}", Paint::white(&config.secret_key));
         info_!("limits: {}", Paint::white(&config.limits));
 
         let tls_configured = config.tls.is_some();
         if tls_configured && cfg!(feature = "tls") {
             info_!("tls: {}", Paint::white("enabled"));
-        } else {
+        } else if tls_configured {
-            if tls_configured {
             error_!("tls: {}", Paint::white("disabled"));
             error_!("tls is configured, but the tls feature is disabled");
         } else {
             info_!("tls: {}", Paint::white("disabled"));
         }
+
+        if config.secret_key.is_generated() && config.environment.is_prod() {
+            warn!("environment is 'production', but no `secret_key` is configured");
         }
 
         for (name, value) in config.extras() {