2fa1a9ef8e
* Harden C# expression host-code execution * Address script authorization review feedback * Harden script authorization failure responses * Address code quality review feedback * Use explicit failure filter in script authorization * Centralize script activity type names * Address script authorization review feedback
73 lines
2.7 KiB
C#
73 lines
2.7 KiB
C#
using System.Runtime.CompilerServices;
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using Elsa.Extensions;
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using Elsa.Expressions.Python.Contracts;
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using Elsa.Expressions.Python.Models;
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using Elsa.Workflows;
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using Elsa.Workflows.Attributes;
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using Elsa.Workflows.UIHints;
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using Elsa.Workflows.Models;
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// ReSharper disable once CheckNamespace
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namespace Elsa.Expressions.Python.Activities;
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/// <summary>
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/// Executes Python code.
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/// </summary>
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[Activity(WorkflowScriptActivityTypeNames.Namespace, WorkflowScriptActivityTypeNames.RunPythonType, 1, "Executes Python code", "Scripting", DisplayName = "Run Python")]
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public class RunPython : CodeActivity<object?>
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{
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/// <inheritdoc />
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public RunPython([CallerFilePath] string? source = null, [CallerLineNumber] int? line = null) : base(source, line)
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{
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}
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/// <inheritdoc />
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public RunPython(string script, [CallerFilePath] string? source = null, [CallerLineNumber] int? line = null) : this(source, line)
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{
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Script = new Input<string>(script);
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}
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/// <summary>
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/// The script to run.
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/// </summary>
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[Input(
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Description = "The script to run.",
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DefaultSyntax = "Python",
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UIHint = InputUIHints.CodeEditor,
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UIHandler = typeof(RunPythonOptionsProvider)
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)]
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public Input<string> Script { get; set; } = new("");
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/// <summary>
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/// A list of possible outcomes. Use "SetOutcome(string)" to set the outcome. Use "SetOutcomes(params string[])" to set multiple outcomes.
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/// </summary>
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[Input(Description = "A list of possible outcomes.", UIHint = InputUIHints.DynamicOutcomes)]
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public Input<ICollection<string>> PossibleOutcomes { get; set; } = null!;
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/// <inheritdoc />
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protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
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{
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var script = context.Get(Script);
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// If no script was specified, there's nothing to do.
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if (string.IsNullOrWhiteSpace(script))
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return;
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// Get a Python evaluator.
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var evaluator = context.GetRequiredService<IPythonEvaluator>();
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// Run the script.
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var result = await evaluator.EvaluateAsync(script, typeof(object), context.ExpressionExecutionContext, context.CancellationToken);
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// Set the result as output, if any.
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if (result is not null)
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context.Set(Result, result);
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// Get the outcome or outcomes set by the script, if any. If not set, use "Done".
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var outcomes = context.ExpressionExecutionContext.TransientProperties.GetValueOrDefault(OutcomeProxy.OutcomePropertiesKey, () => new[] { "Done" })!;
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// Complete the activity with the outcome.
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await context.CompleteActivityWithOutcomesAsync(outcomes);
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}
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}
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