- Add encryption_modus field for msgs table and expose getters/setters on

Message
- Mind the encryption modus in RenderedEmail

src/chat.rs

@@ -924,27 +924,31 @@ impl ChatId {
     /// This sets a protection modus for the chat and enforces that messages are only send if they
     /// meet the encryption modus (ForcePlaintext, Opportunistic, ForceEncrypted, ForceVerified)
     pub async fn set_encryption_modus(self, context: &Context, modus: &EncryptionModus) -> Result<()> {
-        let encryption_modus: u32 = context
+        context
             .sql
-            .query_get_value(
+            .execute(
-                "SELECT encryption_modus FROM chats WHERE id=?;",
+                "UPDATE chats SET encryption_modus=? WHERE id=?;",
-                paramsv![self],
+                paramsv![modus, self],
             )
-            .await??;
+            .await?;
-        Ok(encryption_modus.unwrap_or_default())
+
+        Ok(())
     }
 
     /// This sets a protection modus for the chat and enforces that messages are only send if they
     /// meet the encryption modus (ForcePlaintext, Opportunistic, ForceEncrypted, ForceVerified)
-    pub async fn get_encryption_modus(self, context: &Context) -> Result<EncryptionModus> {
+    pub async fn get_encryption_modus(self, context: &Context) -> Result<Option<EncryptionModus>> {
-        let encryption_modus: u32 = context
+        let encryption_modus: Option<EncryptionModus> = context
             .sql
             .query_get_value(
                 "SELECT encryption_modus FROM chats WHERE id=?;",
                 paramsv![self],
             )
-            .await??;
+            .await?;
-        Ok(encryption_modus.into())
+
+        
+
+        Ok(encryption_modus)
     }
 
 
@@ -5699,4 +5703,20 @@ mod tests {
 
         Ok(())
     }
+
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_encryption_modus() -> Result<()> {
+        let t = TestContext::new_alice().await;
+        let contact_fiona = Contact::create(&t, "", "fiona@example.net").await?;
+        let chat_id = create_group_chat(&t, ProtectionStatus::Unprotected, "Group").await?;
+
+        assert_eq!(chat_id.get_encryption_modus(&t).await?, Some(EncryptionModus::Opportunistic)); 
+
+        chat_id.set_encryption_modus(&t, &EncryptionModus::ForceEncrypted).await?;
+
+        assert_eq!(chat_id.get_encryption_modus(&t).await?, Some(EncryptionModus::ForceEncrypted)); 
+
+        Ok(())
+    }
 }

src/message.rs

@@ -31,6 +31,7 @@ use crate::tools::{
     create_smeared_timestamp, get_filebytes, get_filemeta, gm2local_offset, read_file, time,
     timestamp_to_str, truncate,
 };
+use crate::chat::EncryptionModus;
 
 /// Message ID, including reserved IDs.
 ///
@@ -302,6 +303,7 @@ impl Message {
                     "    m.hidden AS hidden,",
                     "    m.location_id AS location,",
                     "    c.blocked AS blocked",
+                    "    m.encryption_modus as encryption_modus",
                     " FROM msgs m LEFT JOIN chats c ON c.id=m.chat_id",
                     " WHERE m.id=?;"
                 ),
@@ -354,7 +356,7 @@ impl Message {
                         location_id: row.get("location")?,
                         chat_blocked: row
                             .get::<_, Option<Blocked>>("blocked")?
-                            .unwrap_or_default(),
+                            .unwrap_or_default()
                     };
                     Ok(msg)
                 },
@@ -848,10 +850,35 @@ impl Message {
     }
 
     /// Force the message to be sent in plain text.
+    /// Deprecated: use Message::set_encryption_modus(EncryptionModus::ForcePlaintext)
     pub fn force_plaintext(&mut self) {
         self.param.set_int(Param::ForcePlaintext, 1);
     }
 
+    async fn set_encryption_modus(&mut self, context: &Context,  encryption_modus: &EncryptionModus) -> Result<()> { 
+        context
+            .sql
+            .execute(
+                "UPDATE msgs SET encryption_modus=? WHERE id=?;",
+                paramsv![encryption_modus, self.id],
+            )
+            .await?;
+
+        Ok(())
+    }
+
+    pub async fn get_encryption_modus(&self, context: &Context) -> Result<Option<EncryptionModus>> { 
+        let encryption_modus: Option<EncryptionModus> = context
+            .sql
+            .query_get_value(
+                "SELECT encryption_modus FROM msgs WHERE id=?;",
+                paramsv![self.id],
+            )
+            .await?;
+
+        Ok(encryption_modus)
+    }
+
     pub async fn update_param(&self, context: &Context) -> Result<()> {
         context
             .sql

src/mimefactory.rs

@@ -29,6 +29,7 @@ use crate::tools::{
     create_outgoing_rfc724_mid, create_smeared_timestamp, get_filebytes, remove_subject_prefix,
     time,
 };
+use crate::chat::EncryptionModus;
 
 // attachments of 25 mb brutto should work on the majority of providers
 // (brutto examples: web.de=50, 1&1=40, t-online.de=32, gmail=25, posteo=50, yahoo=25, all-inkl=100).
@@ -324,7 +325,7 @@ impl<'a> MimeFactory<'a> {
         }
     }
 
-    fn should_force_plaintext(&self) -> bool {
+    fn should_force_plaintext(&self, encryption_modus: &EncryptionModus) -> bool {
         match &self.loaded {
             Loaded::Message { chat } => {
                 if chat.is_protected() {
@@ -333,6 +334,8 @@ impl<'a> MimeFactory<'a> {
                     // encryption may disclose recipients;
                     // this is probably a worse issue than not opportunistically (!) encrypting
                     true
+                } else if encryption_modus == &EncryptionModus::ForcePlaintext {
+                    true
                 } else {
                     self.msg
                         .param
@@ -602,7 +605,11 @@ impl<'a> MimeFactory<'a> {
 
         let min_verified = self.min_verified();
         let grpimage = self.grpimage();
-        let force_plaintext = self.should_force_plaintext();
+        let encryption_modus = match self.msg.get_encryption_modus(context).await? {
+            Some(encryption_modus) => encryption_modus,
+            None => EncryptionModus::Opportunistic
+        };
+        let force_plaintext = self.should_force_plaintext(&encryption_modus);
         let skip_autocrypt = self.should_skip_autocrypt();
         let e2ee_guaranteed = self.is_e2ee_guaranteed();
         let encrypt_helper = EncryptHelper::new(context).await?;
@@ -644,6 +651,26 @@ impl<'a> MimeFactory<'a> {
             encrypt_helper.should_encrypt(context, e2ee_guaranteed, &peerstates)?;
         let is_encrypted = should_encrypt && !force_plaintext;
 
+
+        // Ensure we fulfill encryption_modus
+        match encryption_modus {
+            EncryptionModus::Opportunistic => {},
+            EncryptionModus::ForcePlaintext => {
+                ensure!(!is_encrypted, "EncryptionModus is ForcePlaintext but message is encrypted");
+            },
+            EncryptionModus::ForceEncrypted => {
+                ensure!(is_encrypted, "EncryptionModus is ForceEncrypted but message is unencrypted");
+            },
+            EncryptionModus::ForceVerified => {
+                let chat_is_protected = if let Loaded::Message { chat } = &self.loaded {
+                    chat.is_protected()
+                } else {
+                    false
+                };
+                ensure!(is_encrypted && chat_is_protected, "EncryptionModus is ForceVerified but chat is not protected");
+            }
+        };
+
         let message = if parts.is_empty() {
             // Single part, render as regular message.
             main_part

src/param.rs

@@ -51,6 +51,7 @@ pub enum Param {
     ErroneousE2ee = b'e',
 
     /// For Messages: force unencrypted message, a value from `ForcePlaintext` enum.
+    /// Deprecated: Use EncryptionModus::ForcePlaintext
     ForcePlaintext = b'u',
 
     /// For Messages: do not include Autocrypt header.

src/sql/tables.sql

@@ -93,7 +93,8 @@ CREATE TABLE msgs (
 -- deleted. It is convenient to store it here because UI
 -- needs this value to display how much time is left until
 -- the message is deleted.
-    ephemeral_timestamp INTEGER DEFAULT 0
+    ephemeral_timestamp INTEGER DEFAULT 0,
+    encryption_modus INTEGER DEFAULT 0
 );
 
 CREATE INDEX msgs_index1 ON msgs (rfc724_mid);