api: add dc_make_vcard() and dc_import_vcard()

deltachat-ffi/deltachat.h

@@ -2162,6 +2162,29 @@ uint32_t        dc_create_contact            (dc_context_t* context, const char*
 int             dc_add_address_book          (dc_context_t* context, const char* addr_book);
 
 
+/**
+ * Make a vCard.
+ *
+ * @memberof dc_context_t
+ * @param context The context object.
+ * @param contact_id The ID of the contact to make the vCard of.
+ * @return vCard, must be released using dc_str_unref() after usage.
+ */
+char*           dc_make_vcard                (dc_context_t* context, uint32_t contact_id);
+
+
+/**
+ * Import a vCard.
+ *
+ * @memberof dc_context_t
+ * @param context The context object.
+ * @param vcard vCard contents.
+ * @return Returns the IDs of the contacts in the order they appear in the vCard.
+ *         Must be dc_array_unref()'d after usage.
+ */
+dc_array_t*     dc_import_vcard              (dc_context_t* context, const char* vcard);
+
+
 /**
  * Returns known and unblocked contacts.
  *

deltachat-ffi/src/lib.rs

@@ -2170,6 +2170,48 @@ pub unsafe extern "C" fn dc_add_address_book(
     })
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn dc_make_vcard(
+    context: *mut dc_context_t,
+    contact_id: u32,
+) -> *mut libc::c_char {
+    if context.is_null() {
+        eprintln!("ignoring careless call to dc_make_vcard()");
+        return ptr::null_mut();
+    }
+    let ctx = &*context;
+    let contact_id = ContactId::new(contact_id);
+
+    block_on(contact::make_vcard(ctx, &[contact_id]))
+        .unwrap_or_log_default(ctx, "dc_make_vcard failed")
+        .strdup()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_import_vcard(
+    context: *mut dc_context_t,
+    vcard: *const libc::c_char,
+) -> *mut dc_array::dc_array_t {
+    if context.is_null() || vcard.is_null() {
+        eprintln!("ignoring careless call to dc_import_vcard()");
+        return ptr::null_mut();
+    }
+    let ctx = &*context;
+
+    match block_on(contact::import_vcard(ctx, &to_string_lossy(vcard)))
+        .context("dc_import_vcard failed")
+        .log_err(ctx)
+    {
+        Ok(contact_ids) => Box::into_raw(Box::new(dc_array_t::from(
+            contact_ids
+                .iter()
+                .map(|id| id.to_u32())
+                .collect::<Vec<u32>>(),
+        ))),
+        Err(_) => ptr::null_mut(),
+    }
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_get_contacts(
     context: *mut dc_context_t,