Implement continuation for /next (#47)

InnerTube.Tests/PlayerTests.cs

@@ -180,6 +180,20 @@ public async Task GetVideoNext(string videoId)
 		Assert.Pass(sb.ToString());
 	}
 
+	[TestCase("CBQSKRILMlFPNDBIalJIMnfAAQDIAQDgAQOiAg0o____________AUAA-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%3D")]
+	public async Task ContinueVideoNext(string continuation)
+	{
+		InnerTubeContinuationResponse response = await _innerTube.ContinueVideoAsync(continuation);
+		StringBuilder sb = new();
+
+		foreach (IRenderer renderer in response.Contents)
+			sb.AppendLine("->\t" + string.Join("\n\t", (renderer.ToString() ?? "UNKNOWN RENDERER " + renderer.Type).Split("\n")));
+
+		sb.AppendLine($"Continuation: {response.Continuation?.Substring(0, 20)}");
+
+		Assert.Pass(sb.ToString());
+	}
+
 	[TestCase("3BR7-AzE2dQ", "OLAK5uy_l6pEkEJgy577R-aDlJ3Gkp5rmlgIOu8bc", null, null)]
 	[TestCase("o0tky2O8NlY", "OLAK5uy_l6pEkEJgy577R-aDlJ3Gkp5rmlgIOu8bc", null, null)]
 	[TestCase("NZwS7Cja6oE", "PLv3TTBr1W_9tppikBxAE_G6qjWdBljBHJ", null, null)]

InnerTube/InnerTube.cs

@@ -229,6 +229,23 @@ public async Task<InnerTubeNextResponse> GetVideoAsync(string videoId, string? p
 		return new InnerTubeNextResponse(nextResponse);
 	}
 
+	/// <summary>
+	/// Continues the video recommendations from the last continuation token
+	/// </summary>
+	/// <param name="continuation">Continuation token received from GetVideoAsync</param>
+	/// <param name="language">Language of the content</param>
+	/// <param name="region">Region of the content</param>
+	/// <returns>List of recommended content for the video that belongs to the specified key</returns>
+	public async Task<InnerTubeContinuationResponse> ContinueVideoAsync(string continuation,
+		string language = "en", string region = "US")
+	{
+		InnerTubeRequest postData = new InnerTubeRequest()
+			.AddValue("continuation", continuation);
+
+		JObject nextResponse = await MakeRequest(RequestClient.WEB, "next", postData, language, region);
+		return InnerTubeContinuationResponse.GetFromNext(nextResponse);
+	}
+
 	/// <summary>
 	/// Gets the comments of a video from a comment continuation token that can be received from GetVideoAsync
 	/// </summary>

InnerTube/Models/InnerTubeContinuationResponse.cs

@@ -57,4 +57,12 @@ public static InnerTubeContinuationResponse GetFromBrowse(JObject browseResponse
 		return new InnerTubeContinuationResponse(contents.Where(x => x is not ContinuationItemRenderer),
 			((ContinuationItemRenderer?)contents.FirstOrDefault(x => x is ContinuationItemRenderer))?.Token);
 	}
+
+	public static InnerTubeContinuationResponse GetFromNext(JObject browseResponse)
+	{
+		IEnumerable<IRenderer> contents = RendererManager.ParseRenderers(browseResponse.GetFromJsonPath<JArray>(
+			"onResponseReceivedEndpoints[0].appendContinuationItemsAction.continuationItems")!).ToArray();
+		return new InnerTubeContinuationResponse(contents.Where(x => x is not ContinuationItemRenderer),
+			((ContinuationItemRenderer?)contents.FirstOrDefault(x => x is ContinuationItemRenderer))?.Token);
+	}
 }