Improved the readability of the logic for managing mrsigners and mrenclaves by using if let to unwrap the option

src/config.rs

@@ -58,25 +58,22 @@ impl InstanceMeasurement {
 
     pub fn with_current_mrsigner(self) -> Result<Self, RaTlsError> {
         let quote = Self::generate_static_empty_quote()?;
-
         let mrsigner_from_quote = quote.mrsigner().into();
 
-        if self.mrsigners.is_none() {
+        if let Some(mrsigners) = self.mrsigners {
+            if mrsigners.contains(&mrsigner_from_quote) {
+                // already contains the mrsigner
+                Ok(self)
+            } else {
+                let mut mrsigners = self.mrsigners.clone().unwrap();
+                mrsigners.push(mrsigner_from_quote);
+                Ok(self.with_mrsigners(mrsigners))
+            }
+        } else {
             Ok(Self {
                 mrsigners: Some(vec![mrsigner_from_quote]),
                 ..self
             })
-        } else if !self
-            .mrsigners
-            .as_ref()
-            .unwrap()
-            .contains(&mrsigner_from_quote)
-        {
-            let mut mrsigners = self.mrsigners.clone().unwrap();
-            mrsigners.push(mrsigner_from_quote);
-            Ok(self.with_mrsigners(mrsigners))
-        } else {
-            Ok(self)
         }
     }
 
@@ -84,22 +81,20 @@ impl InstanceMeasurement {
         let quote = Self::generate_static_empty_quote()?;
         let mrenclave_from_quote = quote.mrenclave().into();
 
-        if self.mrenclaves.is_none() {
+        if let Some(mrenclaves) = self.mrenclaves {
+            if mrenclaves.contains(&mrenclave_from_quote) {
+                // already contains the mrenclave
+                Ok(self)
+            } else {
+                let mut mrenclaves = self.mrenclaves.clone().unwrap();
+                mrenclaves.push(mrenclave_from_quote);
+                Ok(self.with_mrenclaves(mrenclaves))
+            }
+        } else {
             Ok(Self {
                 mrenclaves: Some(vec![mrenclave_from_quote]),
                 ..self
             })
-        } else if !self
-            .mrenclaves
-            .as_ref()
-            .unwrap()
-            .contains(&mrenclave_from_quote)
-        {
-            let mut mrenclaves = self.mrenclaves.clone().unwrap();
-            mrenclaves.push(mrenclave_from_quote);
-            Ok(self.with_mrsigners(mrenclaves))
-        } else {
-            Ok(self)
         }
     }