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char* self_addr = NULL;
char* self_addr_urlencoded = NULL;
char* self_name = NULL;
char* self_name_urlencoded = NULL;
char* fingerprint = NULL;
char* invitenumber = NULL;
char* auth = NULL;
dc_chat_t* chat = NULL;
char* group_name = NULL;
char* group_name_urlencoded= NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC) {
goto cleanup;
}
dc_ensure_secret_key_exists(context);
// invitenumber will be used to allow starting the handshake, auth will be used to verify the fingerprint
invitenumber = dc_token_lookup(context, DC_TOKEN_INVITENUMBER, group_chat_id);
if (invitenumber==NULL) {
invitenumber = dc_create_id();
dc_token_save(context, DC_TOKEN_INVITENUMBER, group_chat_id, invitenumber);
}
auth = dc_token_lookup(context, DC_TOKEN_AUTH, group_chat_id);
if (auth==NULL) {
auth = dc_create_id();
dc_token_save(context, DC_TOKEN_AUTH, group_chat_id, auth);
}
if ((self_addr = dc_sqlite3_get_config(context->sql, "configured_addr", NULL))==NULL) {
dc_log_error(context, 0, "Not configured, cannot generate QR code.");
goto cleanup;
}
self_name = dc_sqlite3_get_config(context->sql, "displayname", "");
if ((fingerprint=get_self_fingerprint(context))==NULL) {
goto cleanup;
}
self_addr_urlencoded = dc_urlencode(self_addr);
self_name_urlencoded = dc_urlencode(self_name);
if (group_chat_id)
{
// parameters used: a=g=x=i=s=
chat = dc_get_chat(context, group_chat_id);
if (chat==NULL) {
dc_log_error(context, 0, "Cannot get QR-code for chat-id %i", group_chat_id);
goto cleanup;
}
group_name = dc_chat_get_name(chat);
group_name_urlencoded = dc_urlencode(group_name);
qr = dc_mprintf(DC_OPENPGP4FPR_SCHEME "%s#a=%s&g=%s&x=%s&i=%s&s=%s", fingerprint, self_addr_urlencoded, group_name_urlencoded, chat->grpid, invitenumber, auth);
}
else
{
// parameters used: a=n=i=s=
qr = dc_mprintf(DC_OPENPGP4FPR_SCHEME "%s#a=%s&n=%s&i=%s&s=%s", fingerprint, self_addr_urlencoded, self_name_urlencoded, invitenumber, auth);
}
dc_log_info(context, 0, "Generated QR code: %s", qr);
cleanup:
free(self_addr_urlencoded);
free(self_addr);
free(self_name);
free(self_name_urlencoded);
free(fingerprint);
free(invitenumber);
free(auth);
dc_chat_unref(chat);
free(group_name);
free(group_name_urlencoded);
return qr? qr : dc_strdup(NULL);
}
/**
* Join an out-of-band-verification initiated on another device with dc_get_securejoin_qr().
* This function is typically called when dc_check_qr() returns
* lot.state=DC_QR_ASK_VERIFYCONTACT or lot.state=DC_QR_ASK_VERIFYGROUP.
*
* This function takes some time and sends and receives several messages.
* You should call it in a separate thread; if you want to abort it, you should
* call dc_stop_ongoing_process().
*
* @memberof dc_context_t
* @param context The context object
* @param qr The text of the scanned QR code. Typically, the same string as given
* to dc_check_qr().
* @return Chat-id of the joined chat, the UI may redirect to the this chat.
* If the out-of-band verification failed or was aborted, 0 is returned.
*/
uint32_t dc_join_securejoin(dc_context_t* context, const char* qr)
{
/* ==========================================================
==== Bob - the joiner's side =====
==== Step 2 in "Setup verified contact" protocol =====