[taler-sync] branch master updated: lib skeleton

[gnunet]

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grothoff pushed a commit to branch master
in repository sync.

The following commit(s) were added to refs/heads/master by this push:
     new c4b5ac2  lib skeleton
c4b5ac2 is described below

commit c4b5ac29367dd1d845c19851504784bdbdbc1fd5
Author: Christian Grothoff <address@hidden>
AuthorDate: Sun Nov 24 17:44:06 2019 +0100

    lib skeleton
---
 src/include/sync_service.h                         |  3 +
 src/lib/Makefile.am                                |  3 +-
 src/lib/{sync_api_upload.c => sync_api_download.c} | 56 ++++++++++++++--
 src/lib/sync_api_upload.c                          | 74 +++++++++++++++++++++-
 src/sync/sync-httpd.c                              |  1 -
 5 files changed, 127 insertions(+), 10 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_upload.c b/src/lib/sync_api_download.c
similarity index 51%
copy from src/lib/sync_api_upload.c
copy to src/lib/sync_api_download.c
index b09b01d..e9780e1 100644
--- a/src/lib/sync_api_upload.c
+++ b/src/lib/sync_api_download.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
@@ -18,8 +18,8 @@
 */
 
 /**
- * @file lib/sync_api_upload.c
- * @brief Implementation of the upload POST
+ * @file lib/sync_api_download.c
+ * @brief Implementation of the download
  * @author Christian Grothoff
  */
 #include "platform.h"
@@ -32,9 +32,9 @@
 
 
 /**
- * @brief
+ * @brief Handle for a download operation.
  */
-struct SYNC_UploadOperation
+struct SYNC_DownloadOperation
 {
 
   /**
@@ -52,6 +52,50 @@ struct SYNC_UploadOperation
    */
   struct GNUNET_CURL_Context *ctx;
 
+  /**
+   * Function to call with the result.
+   */
+  SYNC_DownloadCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
 };
 
-/* end of sync_api_upload.c */
+
+/**
+ * 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?
  */

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