Add "database_encrypted" field to Context.get_info()

CHANGELOG.md

@@ -35,6 +35,7 @@
 - sql: enable `auto_vacuum=INCREMENTAL` #2931
 - Synchronize Seen status across devices #2942
 - Add API to set the database password #2956
+- Add information about whether the database is encrypted or not to `dc_get_info()` #3000
 - Add Webxdc #2826 #2971 #2975 #2977 #2979 #2993 #2998
 
 ### Changed

src/context.rs

@@ -383,6 +383,13 @@ impl Context {
         res.insert("number_of_contacts", contacts.to_string());
         res.insert("database_dir", self.get_dbfile().display().to_string());
         res.insert("database_version", dbversion.to_string());
+        res.insert(
+            "database_encrypted",
+            self.sql
+                .is_encrypted()
+                .await
+                .map_or_else(|| "closed".to_string(), |b| b.to_string()),
+        );
         res.insert("journal_mode", journal_mode);
         res.insert("blobdir", self.get_blobdir().display().to_string());
         res.insert("display_name", displayname.unwrap_or_else(|| unset.into()));

src/sql.rs

@@ -43,6 +43,10 @@ pub struct Sql {
     pub(crate) dbfile: PathBuf,
 
     pool: RwLock<Option<r2d2::Pool<r2d2_sqlite::SqliteConnectionManager>>>,
+
+    /// None if the database is not open, true if it is open with passphrase and false if it is
+    /// open without a passphrase.
+    is_encrypted: RwLock<Option<bool>>,
 }
 
 impl Sql {
@@ -50,6 +54,7 @@ impl Sql {
         Self {
             dbfile,
             pool: Default::default(),
+            is_encrypted: Default::default(),
         }
     }
 
@@ -85,6 +90,13 @@ impl Sql {
         self.pool.read().await.is_some()
     }
 
+    /// Returns true if the database is encrypted.
+    ///
+    /// If database is not open, returns `None`.
+    pub(crate) async fn is_encrypted(&self) -> Option<bool> {
+        *self.is_encrypted.read().await
+    }
+
     /// Closes all underlying Sqlite connections.
     async fn close(&self) {
         let _ = self.pool.write().await.take();
@@ -286,11 +298,13 @@ impl Sql {
             bail!("SQL database is already opened.");
         }
 
+        let passphrase_nonempty = !passphrase.is_empty();
         if let Err(err) = self.try_open(context, &self.dbfile, passphrase).await {
             self.close().await;
             Err(err)
         } else {
             info!(context, "Opened database {:?}.", self.dbfile);
+            *self.is_encrypted.write().await = Some(passphrase_nonempty);
             Ok(())
         }
     }