lib skeleton

5 files changed, 178 insertions, 4 deletions

diff --git a/src/include/sync_service.h b/src/include/sync_service.h
index 627be51..47dfdb4 100644
--- a/src/include/sync_service.h
+++ b/src/include/sync_service.h
@@ -318,4 +318,7 @@ void
 SYNC_download_cancel (struct SYNC_DownloadOperation *download);
 
 
+/* TODO: API for /terms! */
+
+
 #endif  /* SYNC_SERVICE_H */
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 5f05c26..b1b1d92 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -14,7 +14,8 @@ libsync_la_LDFLAGS = \
   -no-undefined
 
 libsync_la_SOURCES = \
-  sync_api_upload.c
+  sync_api_download.c \
+  sync_api_upload.c 
 
 libsync_la_LIBADD = \
   -lgnunetcurl \
diff --git a/src/lib/sync_api_download.c b/src/lib/sync_api_download.c
new file mode 100644
index 0000000..e9780e1
--- /dev/null
+++ b/src/lib/sync_api_download.c
@@ -0,0 +1,101 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2019 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1,
+  or (at your option) any later version.
+
+  TALER 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 Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with TALER; see the file COPYING.LGPL.  If not,
+  see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file lib/sync_api_download.c
+ * @brief Implementation of the download
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "sync_service.h"
+
+
+/**
+ * @brief Handle for a download operation.
+ */
+struct SYNC_DownloadOperation
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+  /**
+   * Function to call with the result.
+   */
+  SYNC_DownloadCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
+};
+
+
+/**
+ * Download the latest version of a backup for account @a pub.
+ *
+ * @param ctx for HTTP client request processing
+ * @param base_url base URL of the Sync server
+ * @param pub account public key
+ * @param cb function to call with the backup
+ * @param cb_cls closure for @a cb
+ * @return handle for the operation
+ */
+struct SYNC_DownloadOperation *
+SYNC_download (struct GNUNET_CURL_Context *ctx,
+               const char *base_url,
+               const struct SYNC_AccountPublicKeyP *pub,
+               SYNC_DownloadCallback cb,
+               void *cb_cls)
+{
+  GNUNET_break (0);
+  return NULL;
+}
+
+
+/**
+ * Cancel the download.
+ *
+ * @param do operation to cancel.
+ */
+void
+SYNC_download_cancel (struct SYNC_DownloadOperation *download)
+{
+}
+
+
+/* end of sync_api_download.c */
diff --git a/src/lib/sync_api_upload.c b/src/lib/sync_api_upload.c
index b09b01d..84be034 100644
--- a/src/lib/sync_api_upload.c
+++ b/src/lib/sync_api_upload.c
@@ -1,6 +1,6 @@
 /*
   This file is part of TALER
-  Copyright (C) 2014-2017 GNUnet e.V. and INRIA
+  Copyright (C) 2014-2019 Taler Systems SA
 
   TALER is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
@@ -32,7 +32,7 @@
 
 
 /**
- * @brief
+ * @brief Handle for an upload operation.
  */
 struct SYNC_UploadOperation
 {
@@ -52,6 +52,76 @@ struct SYNC_UploadOperation
    */
   struct GNUNET_CURL_Context *ctx;
 
+  /**
+   * Function to call with the result.
+   */
+  SYNC_UploadCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
 };
 
+
+/**
+ * Upload a @a backup to a Sync server. Note that @a backup must
+ * have already been compressed, padded and encrypted by the
+ * client.
+ *
+ * While @a pub is theoretically protected by the HTTPS protocol and
+ * required to access the backup, it should be assumed that an
+ * adversary might be able to download the backups from the Sync
+ * server -- or even run the Sync server. Thus, strong encryption
+ * is essential and NOT implemented by this function.
+ *
+ * The use of Anastasis to safely store the Sync encryption keys and
+ * @a pub is recommended.  Storing @a priv in Anastasis depends on
+ * your priorities: without @a priv, further updates to the backup are
+ * not possible, and the user would have to pay for another
+ * account. OTOH, without @a priv an adversary that compromised
+ * Anastasis can only read the backups, but not alter or destroy them.
+ *
+ * @param ctx for HTTP client request processing
+ * @param base_url base URL of the Sync server
+ * @param priv private key of an account with the server
+ * @param prev_backup_hash hash of the previous backup, NULL for the first upload ever
+ * @param backup_size number of bytes in @a backup
+ * @param payment_requested #GNUNET_YES if the client wants to pay more for the account now
+ * @param paid_order_id order ID of a recent payment made, or NULL for none
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle for the operation
+ */
+struct SYNC_UploadOperation *
+SYNC_upload (struct GNUNET_CURL_Context *ctx,
+             const char *base_url,
+             struct SYNC_AccountPrivateKeyP *priv,
+             const struct GNUNET_HashCode *prev_backup_hash,
+             size_t backup_size,
+             const void *backup,
+             int payment_requested,
+             const char *paid_order_id,
+             SYNC_UploadCallback cb,
+             void *cb_cls)
+{
+  GNUNET_break (0);
+  return NULL;
+}
+
+
+/**
+ * Cancel the upload.  Note that aborting an upload does NOT guarantee
+ * that it did not complete, it is possible that the server did
+ * receive the full request before the upload is aborted.
+ *
+ * @param uo operation to cancel.
+ */
+void
+SYNC_upload_cancel (struct SYNC_UploadOperation *uo)
+{
+}
+
+
 /* end of sync_api_upload.c */
diff --git a/src/sync/sync-httpd.c b/src/sync/sync-httpd.c
index 1918d42..982a317 100644
--- a/src/sync/sync-httpd.c
+++ b/src/sync/sync-httpd.c
@@ -33,7 +33,6 @@
 #define UNIX_BACKLOG 500
 
 
-
 /**
  * Should a "Connection: close" header be added to each HTTP response?
  */