feat: Common SDK + CLI Demo

.gitignore

@@ -38,6 +38,9 @@ obj/
 *.lastbuildstate
 *.idb
 
+.DS_STORE
+
+
 # NuGet packages
 *.nupkg
 *.snupkg
@@ -49,3 +52,12 @@ TestResults/
 *.VSIXProjectLaunch
 .project
 .vsconfig
+
+*.db
+*.db-shm
+*.db-wal
+
+#Core binaries - add rules after ps extension downloading is supported
+*.dylib
+*.dll
+*.so

Directory.build.props

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project>
+    <ItemGroup>
+        <Compile Include="$(MSBuildThisFileDirectory)IsExternalInit.cs" Visible="false" />
+    </ItemGroup>
+</Project>

IsExternalInit.cs

@@ -0,0 +1,7 @@
+using System.ComponentModel;
+
+namespace System.Runtime.CompilerServices
+{
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    internal class IsExternalInit { }
+}

LICENSE

@@ -0,0 +1,177 @@
+
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PowerSync/PowerSync.Common/Client/Connection/IPowerSyncBackendConnector.cs

@@ -0,0 +1,27 @@
+namespace PowerSync.Common.Client.Connection;
+
+public interface IPowerSyncBackendConnector
+{
+    /// <summary> 
+    /// Allows the PowerSync client to retrieve an authentication token from your backend
+    /// which is used to authenticate against the PowerSync service.
+    /// <para /> 
+    /// This should always fetch a fresh set of credentials - don't use cached
+    /// values.
+    /// <para /> 
+    /// Return null if the user is not signed in. Throw an error if credentials
+    /// cannot be fetched due to a network error or other temporary error.
+    ///
+    /// This token is kept for the duration of a sync connection.
+    /// </summary>
+    Task<PowerSyncCredentials?> FetchCredentials();
+
+    /// <summary> 
+    /// Upload local changes to the app backend.
+    ///
+    /// Use <see cref="IPowerSyncDatabase.GetCrudBatch" /> to get a batch of changes to upload.
+    ///
+    /// Any thrown errors will result in a retry after the configured wait period (default: 5 seconds).
+    /// </summary>
+    Task UploadData(IPowerSyncDatabase database);
+}

src/Common/Client/Connection/PowerSyncCredentials.cs → PowerSync/PowerSync.Common/Client/Connection/PowerSyncCredentials.cs

@@ -1,4 +1,4 @@
-namespace Common.Client.Connection;
+namespace PowerSync.Common.Client.Connection;
 public class PowerSyncCredentials(string endpoint, string token, DateTime? expiresAt = null)
 {
     public string Endpoint { get; set; } = endpoint;