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215 lines
14 KiB
HTML
215 lines
14 KiB
HTML
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<ol class="chapter"><li class="chapter-item expanded "><a href="installation.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="running-sync-server.html"><strong aria-hidden="true">1.1.</strong> Running the Sync Server</a></li></ol></li><li class="chapter-item expanded "><a href="internals.html"><strong aria-hidden="true">2.</strong> Internal Details</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="data-model.html"><strong aria-hidden="true">2.1.</strong> Data Model</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="storage.html"><strong aria-hidden="true">2.1.1.</strong> Replica Storage</a></li><li class="chapter-item expanded "><a href="taskdb.html"><strong aria-hidden="true">2.1.2.</strong> Task Database</a></li><li class="chapter-item expanded "><a href="tasks.html"><strong aria-hidden="true">2.1.3.</strong> Tasks</a></li></ol></li><li class="chapter-item expanded "><a href="sync.html"><strong aria-hidden="true">2.2.</strong> Synchronization and the Sync Server</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="sync-model.html"><strong aria-hidden="true">2.2.1.</strong> Synchronization Model</a></li><li class="chapter-item expanded "><a href="snapshots.html"><strong aria-hidden="true">2.2.2.</strong> Snapshots</a></li><li class="chapter-item expanded "><a href="sync-protocol.html"><strong aria-hidden="true">2.2.3.</strong> Server-Replica Protocol</a></li><li class="chapter-item expanded "><a href="plans.html" class="active"><strong aria-hidden="true">2.2.4.</strong> Planned Functionality</a></li></ol></li></ol></li></ol> </div>
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<h1 class="menu-title">TaskChampion</h1>
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<main>
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<h1 id="planned-functionality"><a class="header" href="#planned-functionality">Planned Functionality</a></h1>
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<p>This section is a bit of a to-do list for additional functionality to add to the synchronzation system.
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Each feature has some discussion of how it might be implemented.</p>
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<h2 id="snapshots"><a class="header" href="#snapshots">Snapshots</a></h2>
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<p>As designed, storage required on the server would grow with time, as would the time required for new clients to update to the latest version.
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As an optimization, the server also stores "snapshots" containing a full copy of the task database at a given version.
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Based on configurable heuristics, it may delete older operations and snapshots, as long as enough data remains for active clients to synchronize and for new clients to initialize.</p>
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<p>Since snapshots must be computed by clients, the server may "request" a snapshot when providing the latest version to a client.
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This request comes with a number indicating how much it 'wants" the snapshot.
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Clients which can easily generate and transmit a snapshot should be generous to the server, while clients with more limited resources can wait until the server's requests are more desperate.
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The intent is, where possible, to request snapshots created on well-connected desktop clients over mobile and low-power clients.</p>
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<h2 id="encryption-and-signing"><a class="header" href="#encryption-and-signing">Encryption and Signing</a></h2>
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<p>From the server's perspective, all data except for version numbers are opaque binary blobs.
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Clients encrypt and sign these blobs using a symmetric key known only to the clients.
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This secures the data at-rest on the server.
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Note that privacy is not complete, as the server still has some information about users, including source and frequency of synchronization transactions and size of those transactions.</p>
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<h2 id="backups"><a class="header" href="#backups">Backups</a></h2>
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<p>In this design, the server is little more than an authenticated storage for encrypted blobs provided by the client.
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To allow for failure or data loss on the server, clients are expected to cache these blobs locally for a short time (a week), along with a server-provided HMAC signature.
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When data loss is detected -- such as when a client expects the server to have a version N or higher, and the server only has N-1, the client can send those blobs to the server.
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The server can validate the HMAC and, if successful, add the blobs to its datastore.</p>
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<h2 id="expiration"><a class="header" href="#expiration">Expiration</a></h2>
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<p>Deleted tasks remain in the task database, and are simply hidden in most views.
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All tasks have an expiration time after which they may be flushed, preventing unbounded increase in task database size.
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However, purging of a task does not satisfy the necessary OT guarantees, so some further formal design work is required before this is implemented.</p>
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