feat: integrate client and server sharing workflows

server/tests/WebDrop.Api.Tests/ShareTests.cs

@@ -119,6 +119,37 @@ public sealed class ShareTests(ServerFixture server) : IClassFixture<ServerFixtu
         await AssertErrorAsync(shareCollision, 409, "conflict");
     }
 
+    [Fact]
+    public async Task ResumeWithoutAnInitialDownloadCannotBypassShareDownloadLimit()
+    {
+        var share = new ShareClient(NewId());
+        using (var created = await CreateShare(share)) Assert.Equal(HttpStatusCode.Created, created.StatusCode);
+
+        string manifestId = NewId();
+        using (var manifest = await SendFrame(share, share.Owner, Frame(manifestId, 0, FinalEnc, EncPayload)))
+            Assert.Equal(HttpStatusCode.Created, manifest.StatusCode);
+        string itemId = NewId();
+        using (var first = await SendFrame(share, share.Owner, Frame(itemId, 0, GatedEnc, EncPayload), "1"))
+            Assert.Equal(HttpStatusCode.Created, first.StatusCode);
+        using (var last = await SendFrame(share, share.Owner, Frame(itemId, 1, GatedFinalEnc, EncPayload)))
+            Assert.Equal(HttpStatusCode.Created, last.StatusCode);
+        using (var finish = await server.Http.SendAsync(server.Req(HttpMethod.Post,
+            $"/api/v1/shares/{share.Id}/finish", share.Owner, JsonBody(new { manifest_item_id = manifestId }))))
+            Assert.Equal(HttpStatusCode.OK, finish.StatusCode);
+
+        string path = $"/api/v1/shares/{share.Id}/items/{itemId}/frames";
+        await AssertErrorAsync(await server.Http.SendAsync(server.Req(HttpMethod.Get, path + "?from=1", share.OtherVisitor)), 410, "gone");
+
+        var (initialResponse, initialBytes) = await server.GetBytesAsync(path, share.Visitor);
+        using (initialResponse) Assert.Equal(Frame(itemId, 0, GatedEnc, EncPayload, 0x42).Concat(Frame(itemId, 1, GatedFinalEnc, EncPayload, 0x42)), initialBytes);
+        var (resumeResponse, resumedBytes) = await server.GetBytesAsync(path + "?from=1", share.Visitor);
+        using (resumeResponse) Assert.Equal(Frame(itemId, 1, GatedFinalEnc, EncPayload, 0x42), resumedBytes);
+
+        using var infoResponse = await server.Http.SendAsync(server.Req(HttpMethod.Get, $"/api/v1/shares/{share.Id}", share.CreatorReader));
+        var item = (await ReadJsonAsync(infoResponse)).GetProperty("items").EnumerateArray().Single();
+        Assert.Equal(0, item.GetProperty("downloads_left").GetInt32());
+    }
+
     private async Task<HttpResponseMessage> CreateShare(ShareClient share)
     {
         using var req = server.Req(HttpMethod.Post, "/api/v1/shares", share.Owner, JsonBody(new