/// <summary>
/// Downloads and registers a schema at the specified URI.
/// </summary>
public static IJsonSchema Get(string uri)
{
IJsonSchema schema;
lock (_schemaLookup)
{
uri = uri.TrimEnd('#');
if (!_schemaLookup.TryGetValue(uri, out schema))
{
var schemaJson = JsonSchemaOptions.Download(uri);
var schemaValue = JsonValue.Parse(schemaJson);
schema = JsonSchemaFactory.FromJson(schemaValue, new Uri(uri));
var metaSchemas = new IJsonSchema[]
{
JsonSchema07.MetaSchema,
JsonSchema06.MetaSchema,
JsonSchema04.MetaSchema
};
SchemaValidationResults validation = null;
if (schema.Schema != null)
{
var bySchema = metaSchemas.FirstOrDefault(s => s.Id == schema.Schema);
if (bySchema != null)
{
validation = bySchema.Validate(schemaValue);
}
}
else
{
foreach (var metaSchema in metaSchemas)
{
validation = metaSchema.Validate(schemaValue);
if (validation.Valid)
{
break;
}
}
}
if (validation != null && !validation.Valid)
{
var errors = string.Join(Environment.NewLine, validation.Errors.Select(e => e.Message));
throw new ArgumentException($"The given path does not contain a valid schema. Errors: \n{errors}");
}
_schemaLookup[uri] = schema;
}
}
return(schema);
}