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-rw-r--r--javascript/olm_inbound_group_session.js103
1 files changed, 103 insertions, 0 deletions
diff --git a/javascript/olm_inbound_group_session.js b/javascript/olm_inbound_group_session.js
new file mode 100644
index 0000000..6058233
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+++ b/javascript/olm_inbound_group_session.js
@@ -0,0 +1,103 @@
+/* The 'length' argument to Pointer_stringify doesn't work if the input includes
+ * characters >= 128; we therefore need to add a NULL character to all of our
+ * strings. This acts as a symbolic constant to help show what we're doing.
+ */
+var NULL_BYTE_PADDING_LENGTH = 1;
+
+function InboundGroupSession() {
+ var size = Module['_olm_inbound_group_session_size']();
+ this.buf = malloc(size);
+ this.ptr = Module['_olm_inbound_group_session'](this.buf);
+}
+
+function inbound_group_session_method(wrapped) {
+ return function() {
+ var result = wrapped.apply(this, arguments);
+ if (result === OLM_ERROR) {
+ var message = Pointer_stringify(
+ Module['_olm_inbound_group_session_last_error'](arguments[0])
+ );
+ throw new Error("OLM." + message);
+ }
+ return result;
+ }
+}
+
+InboundGroupSession.prototype['free'] = function() {
+ Module['_olm_clear_inbound_group_session'](this.ptr);
+ free(this.ptr);
+}
+
+InboundGroupSession.prototype['pickle'] = restore_stack(function(key) {
+ var key_array = array_from_string(key);
+ var pickle_length = inbound_group_session_method(
+ Module['_olm_pickle_inbound_group_session_length']
+ )(this.ptr);
+ var key_buffer = stack(key_array);
+ var pickle_buffer = stack(pickle_length + NULL_BYTE_PADDING_LENGTH);
+ inbound_group_session_method(Module['_olm_pickle_inbound_group_session'])(
+ this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
+ );
+ return Pointer_stringify(pickle_buffer);
+});
+
+InboundGroupSession.prototype['unpickle'] = restore_stack(function(key, pickle) {
+ var key_array = array_from_string(key);
+ var key_buffer = stack(key_array);
+ var pickle_array = array_from_string(pickle);
+ var pickle_buffer = stack(pickle_array);
+ inbound_group_session_method(Module['_olm_unpickle_inbound_group_session'])(
+ this.ptr, key_buffer, key_array.length, pickle_buffer,
+ pickle_array.length
+ );
+});
+
+InboundGroupSession.prototype['create'] = restore_stack(function(session_key) {
+ var key_array = array_from_string(session_key);
+ var key_buffer = stack(key_array);
+
+ inbound_group_session_method(Module['_olm_init_inbound_group_session'])(
+ this.ptr, key_buffer, key_array.length
+ );
+});
+
+InboundGroupSession.prototype['decrypt'] = restore_stack(function(
+ message
+) {
+ var message_array = array_from_string(message);
+ var message_buffer = stack(message_array);
+ var max_plaintext_length = inbound_group_session_method(
+ Module['_olm_group_decrypt_max_plaintext_length']
+ )(this.ptr, message_buffer, message_array.length);
+ // caculating the length destroys the input buffer.
+ // So we copy the array to a new buffer
+ var message_buffer = stack(message_array);
+ var plaintext_buffer = stack(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
+ var plaintext_length = inbound_group_session_method(Module["_olm_group_decrypt"])(
+ this.ptr,
+ message_buffer, message_array.length,
+ plaintext_buffer, max_plaintext_length
+ );
+
+ // Pointer_stringify requires a null-terminated argument (the optional
+ // 'len' argument doesn't work for UTF-8 data).
+ Module['setValue'](
+ plaintext_buffer+plaintext_length,
+ 0, "i8"
+ );
+
+ return Pointer_stringify(plaintext_buffer);
+});
+
+InboundGroupSession.prototype['session_id'] = restore_stack(function() {
+ var length = inbound_group_session_method(
+ Module['_olm_inbound_group_session_id_length']
+ )(this.ptr);
+ var session_id = stack(length + NULL_BYTE_PADDING_LENGTH);
+ inbound_group_session_method(Module['_olm_inbound_group_session_id'])(
+ this.ptr, session_id, length
+ );
+ return Pointer_stringify(session_id);
+});
+
+olm_exports['InboundGroupSession'] = InboundGroupSession;