Refactor OMEMO download into AESGCMDownload tool

1 files changed, 134 insertions, 0 deletions

diff --git a/src/tools/aesgcm_download.c b/src/tools/aesgcm_download.c
new file mode 100644
index 00000000..693eabe7
--- /dev/null
+++ b/src/tools/aesgcm_download.c
@@ -0,0 +1,134 @@
+/*
+ * aesgcm_download.c
+ * vim: expandtab:ts=4:sts=4:sw=4
+ *
+ * Copyright (C) 2012 - 2019 James Booth <boothj5@gmail.com>
+ * Copyright (C) 2020 William Wennerström <william@wstrm.dev>
+ *
+ * This file is part of Profanity.
+ *
+ * Profanity is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Profanity is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Profanity.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link the code of portions of this program with the OpenSSL library under
+ * certain conditions as described in each individual source file, and
+ * distribute linked combinations including the two.
+ *
+ * You must obey the GNU General Public License in all respects for all of the
+ * code used other than OpenSSL. If you modify file(s) with this exception, you
+ * may extend this exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this exception
+ * statement from your version. If you delete this exception statement from all
+ * source files in the program, then also delete it here.
+ *
+ */
+
+#define _GNU_SOURCE 1
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <curl/curl.h>
+#include <gio/gio.h>
+#include <pthread.h>
+#include <assert.h>
+
+#include "profanity.h"
+#include "event/client_events.h"
+#include "tools/aesgcm_download.h"
+#include "omemo/omemo.h"
+#include "config/preferences.h"
+#include "ui/ui.h"
+#include "ui/window.h"
+#include "common.h"
+
+#define FALLBACK_MSG ""
+
+void*
+aesgcm_file_get(void* userdata)
+{
+    AESGCMDownload* aesgcm_dl = (AESGCMDownload*)userdata;
+
+    char* https_url = NULL;
+    char* fragment = NULL;
+
+    if (omemo_parse_aesgcm_url(aesgcm_dl->url, &https_url, &fragment) != 0) {
+        http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
+                                   "Download failed: Cannot parse URL.");
+        return NULL;
+    }
+
+    int tmpfd;
+    char* tmpname = NULL;
+    if ((tmpfd = g_file_open_tmp("profanity.XXXXXX", &tmpname, NULL)) == -1) {
+        http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
+                                   "Downloading '%s' failed: Unable to create "
+                                   "temporary ciphertext file for writing.",
+                                   https_url);
+        return NULL;
+    }
+    FILE* tmpfh = fdopen(tmpfd, "wb");
+
+    // Remove the file once it is closed.
+    remove(tmpname);
+    free(tmpname);
+
+    HTTPDownload* http_dl = malloc(sizeof(HTTPDownload));
+    http_dl->window = aesgcm_dl->window;
+    http_dl->worker = aesgcm_dl->worker;
+    http_dl->url = https_url;
+    http_dl->filehandle = tmpfh;
+    http_dl->close = 0;
+
+    aesgcm_dl->http_dl = http_dl;
+
+    // TODO: Verify result.
+    http_file_get(http_dl);
+
+    // Force flush as the decrypt function will read from the same stream.
+    fflush(tmpfh);
+    rewind(tmpfh);
+
+    int crypt_res = omemo_decrypt_file(tmpfh, aesgcm_dl->filehandle,
+                                       http_dl->bytes_received, fragment);
+
+    fclose(tmpfh);
+
+    if (crypt_res != 0) {
+        http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
+                                   "Downloading '%s' failed: Failed to decrypt"
+                                   "file.",
+                                   https_url);
+    }
+
+    fclose(aesgcm_dl->filehandle);
+
+    return NULL;
+}
+
+void
+aesgcm_download_cancel_processes(ProfWin* window)
+{
+    http_download_cancel_processes(window);
+}
+
+void
+aesgcm_download_add_download(AESGCMDownload* aesgcm_dl)
+{
+    http_download_add_download(aesgcm_dl->http_dl);
+}