CODEWITHSUNDEEP
c#jsonjson-rpc
matif
matif

Reputation: 63

How to write "params" in JSON-RPC 2.0 in C#?

I want to use JSON-RPC to control an application called aria2. I can control it when it doesn't need params. But I tried many ways, I never successful in controlling it with params.

Some of the code I've tried is like this:

if (secret != null && secret != "")
    json = JsonConvert.SerializeObject(new JObject { ["jsonrpc"] = "2.0", ["id"] = "m", ["method"] = "aria2.addUri", ["params"] = { "token:" + secret, "[http://csharp.org/file.zip]" } });
else
    json = JsonConvert.SerializeObject(new JObject { ["jsonrpc"] = "2.0", ["id"] = "m", ["method"] = "aria2.addUri", ["params"] = @"[http://csharp.org/file.zip]" });

I also tried:

if (secret != null && secret != "")
    string json = "{\"jsonrpc\": \"2.0\",\"method\": \"aria2.addUri\",\"params\": {\"token:\"" + secret + "\",\"http://csharp.org/file.zip\"},\"id\": \"m\"}";
else
    string json = "{\"jsonrpc\": \"2.0\",\"method\": \"aria2.addUri\",\"params\": {\"http://csharp.org/file.zip\"},\"id\": \"m\"}";

And I have tried many combinations and permutations with [{'" but nothing works.

Here is the RPC guide about aria2 for Python: https://aria2.github.io/manual/en/html/aria2c.html#rpc-authorization-secret-token

Upvotes: 1

Views: 2140

Answers (1)

matif
matif

Reputation: 63

Here is the solution may some beginners want to know.

First, know what you want to output, in this case is:

{"jsonrpc":"2.0","id":"m","method":"aria2.addUri","params":["token:secret",["http://csharp.org/file.zip"]]}

Result is here: http://jsoneditoronline.org/?id=4ee8fb1e0314e124bd3ab7d4b2ed19f1

And then, the little tip, [] is outside from the params's value, so they're arrays, not string. It can't use ["params"] = {}, it also won't cover string to array, for example, following wrong code:

JsonConvert.SerializeObject(new JObject { ["params"] = "[\"token:secret\", [\"http://csharp.org/file.zip\"]]" });

only get:

{"params":"[\"token:secret\", [\"http://csharp.org/file.zip\"]]"}

The most important is the format of token, it's not a JProperty() in JObject(), it's just a string in params's JArray(). And uri is also in params's JArray()'s JArray(). So the right version is:

JArray param = new JArray { "token:secret", new JArray { "http://csharp.org/file.zip" } };
string json = JsonConvert.SerializeObject(new JObject { ["jsonrpc"] = "2.0", ["id"] = "m", ["method"] = "aria2.addUri", ["params"] = param });
  • JArray() is [], JObject() is {}; JArray() ≠ JObject().

If we don't need JsonConvert(), the right version is easy:

string json = "{ \"jsonrpc\": \"2.0\", \"id\": \"m\", \"method\": \"aria2.addUri\", \"params\": [\"token:secret\", [\"http://csharp.org/file.zip\"]] }";
  • We can't change " to ' in this case.

Upvotes: 1

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