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Add Liquid support for accessing appsettings

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This commit is contained in:
Sipke Schoorstra 2021-04-13 12:57:58 +02:00
parent 1d1154723f
commit 5bab13e9f9
2 changed files with 29 additions and 1 deletions
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12
src/scripting/Elsa.Scripting.Liquid/Handlers/ConfigureLiquidEngine.cs
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@ -9,12 +9,20 @@ using Elsa.Services.Models;
using Fluid;
using Fluid.Values;
using MediatR;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json.Linq;
namespace Elsa.Scripting.Liquid.Handlers
{
public class ConfigureLiquidEngine : INotificationHandler<EvaluatingLiquidExpression>
{
private readonly IConfiguration _configuration;
public ConfigureLiquidEngine(IConfiguration configuration)
{
_configuration = configuration;
}
public Task Handle(EvaluatingLiquidExpression notification, CancellationToken cancellationToken)
{
var context = notification.TemplateContext;
@ -23,7 +31,6 @@ namespace Elsa.Scripting.Liquid.Handlers
options.MemberAccessStrategy.Register<ExpandoObject>();
options.MemberAccessStrategy.Register<JObject>();
options.MemberAccessStrategy.Register<JValue>(o => o.Value);
options.MemberAccessStrategy.Register<LiquidActivityModel>();
options.MemberAccessStrategy.Register<LiquidPropertyAccessor, FluidValue>((x, name) => x.GetValueAsync(name));
options.MemberAccessStrategy.Register<ActivityExecutionContext, FluidValue>("Input", x => ToFluidValue(x.Input, options));
@ -34,10 +41,13 @@ namespace Elsa.Scripting.Liquid.Handlers
options.MemberAccessStrategy.Register<LiquidObjectAccessor<object>, object>((x, name) => x.GetValueAsync(name));
options.MemberAccessStrategy.Register<ExpandoObject, object>((x, name) => ((IDictionary<string, object>) x)[name]);
options.MemberAccessStrategy.Register<JObject, object?>((source, name) => source[name]);
options.MemberAccessStrategy.Register<ActivityExecutionContext, LiquidPropertyAccessor>("Configuration", x => new LiquidPropertyAccessor(name => ToFluidValue(GetConfigurationValue(name), options)!));
options.MemberAccessStrategy.Register<ConfigurationSectionWrapper, ConfigurationSectionWrapper?>((source, name) => source.GetSection(name));
return Task.CompletedTask;
}
private ConfigurationSectionWrapper GetConfigurationValue(string name) => new(_configuration.GetSection(name));
private Task<FluidValue> ToFluidValue(object? input, TemplateOptions options) => Task.FromResult(FluidValue.Create(input, options));
private Task<FluidValue?> ToFluidValue(Variables dictionary, string key, TemplateOptions options) => Task.FromResult(!dictionary.Has(key) ? default : FluidValue.Create(dictionary.Get(key), options));
private LiquidActivityModel GetActivityModelAsync(ActivityExecutionContext context, string name) => new(context, name);

18
src/scripting/Elsa.Scripting.Liquid/Helpers/ConfigurationSectionWrapper.cs Normal file
View file

@ -0,0 +1,18 @@
using Microsoft.Extensions.Configuration;
namespace Elsa.Scripting.Liquid.Helpers
{
public class ConfigurationSectionWrapper
{
private readonly IConfigurationSection _section;
public ConfigurationSectionWrapper(IConfigurationSection section)
{
_section = section;
}
public override string ToString() => _section.Value;
public ConfigurationSectionWrapper GetSection(string name) => new(_section.GetSection(name));
}
}