feat: add webxdc limits api

deltachat-ffi/deltachat.h

@@ -4203,6 +4203,10 @@ char*             dc_msg_get_webxdc_blob      (const dc_msg_t* msg, const char*
  *   currently, this is only true for encrypted Webxdc's in the self chat
  *   that have requested internet access in the manifest.
  * - self_addr: address to be used for `window.webxdc.selfAddr` in JS land.
+ * - send_update_interval: Milliseconds to wait before calling `sendUpdate()` again since the last call.
+ *   Should be exposed to `webxdc.sendUpdateInterval` in JS land.
+ * - send_update_max_size: Maximum number of bytes accepted for a serialized update object.
++    Should be exposed to `webxdc.sendUpdateMaxSize` in JS land.
  *
  * @memberof dc_msg_t
  * @param msg The webxdc instance.

deltachat-jsonrpc/src/api/types/webxdc.rs

@@ -37,6 +37,12 @@ pub struct WebxdcMessageInfo {
     internet_access: bool,
     /// Address to be used for `window.webxdc.selfAddr` in JS land.
     self_addr: String,
+    /// Milliseconds to wait before calling `sendUpdate()` again since the last call.
+    /// Should be exposed to `window.sendUpdateInterval` in JS land.
+    send_update_interval: usize,
+    /// Maximum number of bytes accepted for a serialized update object.
+    /// Should be exposed to `window.sendUpdateMaxSize` in JS land.
+    send_update_max_size: usize,
 }
 
 impl WebxdcMessageInfo {
@@ -53,6 +59,8 @@ impl WebxdcMessageInfo {
             source_code_url,
             internet_access,
             self_addr,
+            send_update_interval,
+            send_update_max_size,
         } = message.get_webxdc_info(context).await?;
 
         Ok(Self {
@@ -63,6 +71,8 @@ impl WebxdcMessageInfo {
             source_code_url: maybe_empty_string_to_option(source_code_url),
             internet_access,
             self_addr,
+            send_update_interval,
+            send_update_max_size,
         })
     }
 }

deltachat-ratelimit/src/lib.rs

@@ -90,6 +90,11 @@ impl Ratelimit {
     pub fn until_can_send(&self) -> Duration {
         self.until_can_send_at(SystemTime::now())
     }
+
+    /// Returns minimum possible update interval in milliseconds.
+    pub fn update_interval(&self) -> usize {
+        (self.window.as_millis() as f64 / self.quota) as usize
+    }
 }
 
 #[cfg(test)]
@@ -102,6 +107,7 @@ mod tests {
 
         let mut ratelimit = Ratelimit::new_at(Duration::new(60, 0), 3.0, now);
         assert!(ratelimit.can_send_at(now));
+        assert_eq!(ratelimit.update_interval(), 20_000);
 
         // Send burst of 3 messages.
         ratelimit.send_at(now);

deltachat-rpc-client/tests/test_webxdc.py

@@ -25,6 +25,8 @@ def test_webxdc(acfactory) -> None:
         "sourceCodeUrl": None,
         "summary": None,
         "selfAddr": webxdc_info["selfAddr"],
+        "sendUpdateInterval": 1000,
+        "sendUpdateMaxSize": 18874368,
     }
 
     status_updates = message.get_webxdc_status_updates()

src/webxdc.rs

@@ -40,6 +40,7 @@ use crate::events::EventType;
 use crate::key::{load_self_public_key, DcKey};
 use crate::message::{Message, MessageState, MsgId, Viewtype};
 use crate::mimefactory::wrapped_base64_encode;
+use crate::mimefactory::RECOMMENDED_FILE_SIZE;
 use crate::mimeparser::SystemMessage;
 use crate::param::Param;
 use crate::param::Params;
@@ -105,6 +106,14 @@ pub struct WebxdcInfo {
 
     /// Address to be used for `window.webxdc.selfAddr` in JS land.
     pub self_addr: String,
+
+    /// Milliseconds to wait before calling `sendUpdate()` again since the last call.
+    /// Should be exposed to `window.sendUpdateInterval` in JS land.
+    pub send_update_interval: usize,
+
+    /// Maximum number of bytes accepted for a serialized update object.
+    /// Should be exposed to `window.sendUpdateMaxSize` in JS land.
+    pub send_update_max_size: usize,
 }
 
 /// Status Update ID.
@@ -946,6 +955,8 @@ impl Message {
             },
             internet_access,
             self_addr,
+            send_update_interval: context.ratelimit.read().await.update_interval(),
+            send_update_max_size: RECOMMENDED_FILE_SIZE as usize,
         })
     }
 
@@ -2258,6 +2269,8 @@ sth_for_the = "future""#
         let info = instance.get_webxdc_info(&t).await?;
         assert_eq!(info.name, "minimal.xdc");
         assert_eq!(info.icon, WEBXDC_DEFAULT_ICON.to_string());
+        assert_eq!(info.send_update_interval, 10000);
+        assert_eq!(info.send_update_max_size, RECOMMENDED_FILE_SIZE as usize);
 
         let mut instance = create_webxdc_instance(
             &t,