/// <summary>
/// Given a single JSON-encoded event, parses the event envelope and returns a <see cref="CloudEvent"/>.
/// If the specified event is not valid JSON an exception is thrown.
/// By default, if the event is missing required properties, an exception is thrown though this can be relaxed
/// by setting the <paramref name="skipValidation"/> parameter.
/// </summary>
/// <param name="json">An instance of <see cref="BinaryData"/> containing the JSON for the CloudEvent.</param>
/// <param name="skipValidation">Set to <see langword="true"/> to allow missing or invalid properties to still parse into a CloudEvent.
/// In particular, by setting strict to <see langword="true"/>, the source, id, specversion and type properties are no longer required
/// to be present in the JSON. Additionally, the casing requirements of the extension attribute names are relaxed.
/// </param>
/// <returns> A <see cref="CloudEvent"/>. </returns>
/// <exception cref="ArgumentException">
/// <paramref name="json"/> contained multiple events. <see cref="ParseMany"/> should be used instead.
/// </exception>
public static CloudEvent?Parse(BinaryData json, bool skipValidation = false)
{
Argument.AssertNotNull(json, nameof(json));
using JsonDocument requestDocument = JsonDocument.Parse(json);
CloudEvent?cloudEvent = null;
if (requestDocument.RootElement.ValueKind == JsonValueKind.Object)
{
cloudEvent = CloudEventConverter.DeserializeCloudEvent(requestDocument.RootElement, skipValidation);
}
else if (requestDocument.RootElement.ValueKind == JsonValueKind.Array)
{
if (requestDocument.RootElement.GetArrayLength() > 1)
{
throw new ArgumentException(
"The BinaryData instance contains JSON from multiple cloud events. This method " +
"should only be used with BinaryData containing a single cloud event. " +
Environment.NewLine +
$"To parse multiple events, use the {nameof(ParseMany)} overload.");
}
foreach (JsonElement property in requestDocument.RootElement.EnumerateArray())
{
cloudEvent = CloudEventConverter.DeserializeCloudEvent(property, skipValidation);
break;
}
}
return(cloudEvent);
}
/// <summary>
/// Given JSON-encoded events, parses the event envelope and returns an array of CloudEvents.
/// If the specified event is not valid JSON an exception is thrown.
/// By default, if the event is missing required properties, an exception is thrown though this can be relaxed
/// by setting the <paramref name="skipValidation"/> parameter.
/// </summary>
/// <param name="json">An instance of <see cref="BinaryData"/> containing the JSON for one or more CloudEvents.</param>
/// <param name="skipValidation">Set to <see langword="true"/> to allow missing or invalid properties to still parse into a CloudEvent.
/// In particular, by setting strict to <see langword="true"/>, the source, id, specversion and type properties are no longer required
/// to be present in the JSON. Additionally, the casing requirements of the extension attribute names are relaxed.
/// </param>
/// <returns> An array of <see cref="CloudEvent"/> instances.</returns>
public static CloudEvent[] ParseMany(BinaryData json, bool skipValidation = false)
{
Argument.AssertNotNull(json, nameof(json));
CloudEvent[]? cloudEvents = null;
JsonDocument requestDocument = JsonDocument.Parse(json);
// Parse JsonElement into separate events, deserialize event envelope properties
if (requestDocument.RootElement.ValueKind == JsonValueKind.Object)
{
cloudEvents = new CloudEvent[1];
cloudEvents[0] = CloudEventConverter.DeserializeCloudEvent(requestDocument.RootElement, skipValidation);
}
else if (requestDocument.RootElement.ValueKind == JsonValueKind.Array)
{
cloudEvents = new CloudEvent[requestDocument.RootElement.GetArrayLength()];
int i = 0;
foreach (JsonElement property in requestDocument.RootElement.EnumerateArray())
{
cloudEvents[i++] = CloudEventConverter.DeserializeCloudEvent(property, skipValidation);
}
}
return(cloudEvents ?? Array.Empty <CloudEvent>());
}
