Method FromJson

dotnet/src/webdriver/Response.cs:54–112

Returns a new from a JSON-encoded string. The JSON string to deserialize into a . A object described by the JSON string. If is . If <

(string value)

    /// <exception cref="ArgumentNullException">If <paramref name="value"/> is <see langword="null"/>.</exception>
    /// <exception cref="JsonException">If <paramref name="value"/> is not a valid JSON object.</exception>
    public static Response FromJson(string value)
    {
        JsonObject rawResponse = JsonNode.Parse(value) as JsonObject
            ?? throw new WebDriverException($"JSON success response did not return a dictionary{Environment.NewLine}{value}");

        JsonNode? contents;
        string? sessionId = null;

        if (rawResponse.TryGetPropertyValue("sessionId", out JsonNode? s) && s is not null)
        {
            sessionId = s.ToString();
        }

        if (rawResponse.TryGetPropertyValue("value", out JsonNode? valueObj))
        {
            contents = valueObj;
        }
        else
        {
            // If the returned object does *not* have a "value" property
            // the response value should be the entirety of the response.
            // TODO: Remove this if statement altogether; there should
            // never be a spec-compliant response that does not contain a
            // value property.

            // Special-case for the new session command, where the "capabilities"
            // property of the response is the actual value we're interested in.
            if (rawResponse.TryGetPropertyValue("capabilities", out JsonNode? capabilities))
            {
                contents = capabilities;
            }
            else
            {
                contents = rawResponse;
            }
        }

        if (contents is JsonObject valueDictionary)
        {
            // Special case code for the new session command. If the response contains
            // sessionId and capabilities properties, fix up the session ID and value members.
            if (valueDictionary.TryGetPropertyValue("sessionId", out JsonNode? session))
            {
                sessionId = session?.ToString();
                if (valueDictionary.TryGetPropertyValue("capabilities", out JsonNode? capabilities))
                {
                    contents = capabilities;
                }
                else
                {
                    contents = valueDictionary["value"];
                }
            }
        }

        var contentsDictionary = JsonSerializer.Deserialize(contents, ResponseJsonSerializerContext.Default.Object);

        return new Response(sessionId, contentsDictionary, WebDriverResult.Success);