api: Sketch add_transport_from_qr(), add_transport(), list_transports(), delete_transport() APIs (#6589)

Four new APIs `add_transport_from_qr()`, `add_transport()`,
`list_transports()`, `delete_transport()`, as described in the draft at
"API".

The `add_tranport*()` APIs automatically stops and starts I/O; for
`configure()` the stopping and starting is done in the JsonRPC bindings,
which is not where things like this should be done I think, the bindings
should just translate the APIs.

This also completely disables AEAP for now.

I won't be available for a week, but if you want to merge this already,
feel free to just commit all review suggestions and squash-merge.

deltachat-jsonrpc/src/api.rs

@@ -39,6 +39,7 @@ use deltachat::{imex, info};
 use sanitize_filename::is_sanitized;
 use tokio::fs;
 use tokio::sync::{watch, Mutex, RwLock};
+use types::login_param::EnteredLoginParam;
 use walkdir::WalkDir;
 use yerpc::rpc;
 
@@ -431,6 +432,9 @@ impl CommandApi {
 
     /// Configures this account with the currently set parameters.
     /// Setup the credential config before calling this.
+    ///
+    /// Deprecated as of 2025-02; use `add_transport_from_qr()`
+    /// or `add_transport()` instead.
     async fn configure(&self, account_id: u32) -> Result<()> {
         let ctx = self.get_context(account_id).await?;
         ctx.stop_io().await;
@@ -445,6 +449,69 @@ impl CommandApi {
         Ok(())
     }
 
+    /// Configures a new email account using the provided parameters
+    /// and adds it as a transport.
+    ///
+    /// If the email address is the same as an existing transport,
+    /// then this existing account will be reconfigured instead of a new one being added.
+    ///
+    /// This function stops and starts IO as needed.
+    ///
+    /// Usually it will be enough to only set `addr` and `imap.password`,
+    /// and all the other settings will be autoconfigured.
+    ///
+    /// During configuration, ConfigureProgress events are emitted;
+    /// they indicate a successful configuration as well as errors
+    /// and may be used to create a progress bar.
+    /// This function will return after configuration is finished.
+    ///
+    /// If configuration is successful,
+    /// the working server parameters will be saved
+    /// and used for connecting to the server.
+    /// The parameters entered by the user will be saved separately
+    /// so that they can be prefilled when the user opens the server-configuration screen again.
+    ///
+    /// See also:
+    /// - [Self::is_configured()] to check whether there is
+    ///   at least one working transport.
+    /// - [Self::add_transport_from_qr()] to add a transport
+    ///   from a server encoded in a QR code.
+    /// - [Self::list_transports()] to get a list of all configured transports.
+    /// - [Self::delete_transport()] to remove a transport.
+    async fn add_transport(&self, account_id: u32, param: EnteredLoginParam) -> Result<()> {
+        let ctx = self.get_context(account_id).await?;
+        ctx.add_transport(&param.try_into()?).await
+    }
+
+    /// Adds a new email account as a transport
+    /// using the server encoded in the QR code.
+    /// See [Self::add_transport].
+    async fn add_transport_from_qr(&self, account_id: u32, qr: String) -> Result<()> {
+        let ctx = self.get_context(account_id).await?;
+        ctx.add_transport_from_qr(&qr).await
+    }
+
+    /// Returns the list of all email accounts that are used as a transport in the current profile.
+    /// Use [Self::add_transport()] to add or change a transport
+    /// and [Self::delete_transport()] to delete a transport.
+    async fn list_transports(&self, account_id: u32) -> Result<Vec<EnteredLoginParam>> {
+        let ctx = self.get_context(account_id).await?;
+        let res = ctx
+            .list_transports()
+            .await?
+            .into_iter()
+            .map(|t| t.into())
+            .collect();
+        Ok(res)
+    }
+
+    /// Removes the transport with the specified email address
+    /// (i.e. [EnteredLoginParam::addr]).
+    async fn delete_transport(&self, account_id: u32, addr: String) -> Result<()> {
+        let ctx = self.get_context(account_id).await?;
+        ctx.delete_transport(&addr).await
+    }
+
     /// Signal an ongoing process to stop.
     async fn stop_ongoing_process(&self, account_id: u32) -> Result<()> {
         let ctx = self.get_context(account_id).await?;