public async Task <FileContentResult> PrintDynamic(int templateId, [FromQuery] PrintDynamicArguments args, CancellationToken cancellation)
{
var service = GetFactService();
var result = await service.PrintDynamic(templateId, args, cancellation);
var fileBytes = result.FileBytes;
var fileName = result.FileName;
var contentType = ControllerUtilities.ContentType(fileName);
Response.Headers.Add("x-filename", fileName);
return(File(fileContents: fileBytes, contentType: contentType, fileName));
}
/// <summary>
/// Returns a template-generated text file that is evaluated based on the given <paramref name="templateId"/>.
/// The text generation will implicitly contain a variable $ that evaluates to the results of the dynamic query specified in <paramref name="args"/>.
/// </summary>
public async Task <FileResult> PrintDynamic(int templateId, PrintDynamicArguments args, CancellationToken cancellation)
{
await Initialize(cancellation);
// (1) Preloaded Query
var collection = typeof(TEntity).Name;
var defId = DefinitionId;
// (2) Functions + Variables
var globalFunctions = new Dictionary <string, EvaluationFunction>();
var localFunctions = new Dictionary <string, EvaluationFunction>();
var globalVariables = new Dictionary <string, EvaluationVariable>();
var localVariables = new Dictionary <string, EvaluationVariable>
{
["$Source"] = new EvaluationVariable($"{collection}/{defId}"),
["$Type"] = new EvaluationVariable(args.Type),
["$Select"] = new EvaluationVariable(args.Select),
["$OrderBy"] = new EvaluationVariable(args.OrderBy),
["$Filter"] = new EvaluationVariable(args.Filter),
["$Having"] = new EvaluationVariable(args.Having),
["$Top"] = new EvaluationVariable(args.Top),
["$Skip"] = new EvaluationVariable(args.Skip)
};
await FactBehavior.SetPrintingFunctions(localFunctions, globalFunctions, cancellation);
await FactBehavior.SetPrintingVariables(localVariables, globalVariables, cancellation);
// (2) The templates
var template = await FactBehavior.GetPrintingTemplate(templateId, cancellation);
var nameP = new TemplatePlanLeaf(template.DownloadName, TemplateLanguage.Text);
var bodyP = new TemplatePlanLeaf(template.Body, TemplateLanguage.Html);
var printoutP = new TemplatePlanTuple(nameP, bodyP);
TemplatePlan plan;
if (string.IsNullOrWhiteSpace(template.Context))
{
IReadOnlyList <DynamicRow> data;
if (args.Type == "Fact")
{
var result = await GetFact(new FactArguments
{
Select = args.Select,
Filter = args.Filter,
OrderBy = args.OrderBy,
Top = args.Top,
Skip = args.Skip,
CountEntities = false,
}, cancellation);
data = result?.Data;
}
else if (args.Type == "Aggregate")
{
var result = await GetAggregate(new GetAggregateArguments
{
Select = args.Select,
Filter = args.Filter,
Having = args.Having,
OrderBy = args.OrderBy,
Top = args.Top,
}, cancellation);
data = result?.Data;
}
else
{
throw new ServiceException($"Unknown Type '{args.Type}'.");
}
localVariables.Add("$", new EvaluationVariable(data));
plan = printoutP;
}
else
{
plan = new TemplatePlanDefine("$", template.Context, printoutP);
}
// (4) Culture
CultureInfo culture = GetCulture(args.Culture);
// Generate the output
var genArgs = new TemplateArguments(globalFunctions, globalVariables, localFunctions, localVariables, culture);
await _templateService.GenerateFromPlan(plan, genArgs, cancellation);
var downloadName = nameP.Outputs[0];
var body = bodyP.Outputs[0];
// Change the body to bytes
var bodyBytes = Encoding.UTF8.GetBytes(body);
// Use a default download name if none is provided
if (string.IsNullOrWhiteSpace(downloadName))
{
var meta = await GetMetadata(cancellation);
downloadName = meta.PluralDisplay();
}
if (!downloadName.ToLower().EndsWith(".html"))
{
downloadName += ".html";
}
// Return as a file
return(new FileResult(bodyBytes, downloadName));
}