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ArmTemplateTypeLoader.cs
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ArmTemplateTypeLoader.cs
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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System.Collections.Immutable;
using Azure.Deployments.Core.Definitions;
using Azure.Deployments.Core.Definitions.Schema;
using Azure.Deployments.Core.Entities;
using Azure.Deployments.Expression.Extensions;
using Azure.Deployments.Templates.Engines;
using Azure.Deployments.Templates.Exceptions;
using Bicep.Core.Diagnostics;
using Bicep.Core.Resources;
using Bicep.Core.TypeSystem.Types;
using Microsoft.WindowsAzure.ResourceStack.Common.Collections;
using Microsoft.WindowsAzure.ResourceStack.Common.Extensions;
using Newtonsoft.Json.Linq;
namespace Bicep.Core.TypeSystem;
public static class ArmTemplateTypeLoader
{
public static ITypeReference ToTypeReference(SchemaValidationContext context, ITemplateSchemaNode armTemplateSchemaNode, TypeSymbolValidationFlags flags = TypeSymbolValidationFlags.Default)
{
try
{
var resolved = TemplateEngine.ResolveSchemaReferences(context, armTemplateSchemaNode);
var bicepType = ToTypeReferenceIgnoringNullability(context, resolved, flags);
if (resolved.Nullable?.Value == true)
{
bicepType = TypeHelper.CreateTypeUnion(bicepType, LanguageConstants.Null);
}
return bicepType;
}
catch (TemplateValidationException tve)
{
return ErrorType.Create(DiagnosticBuilder.ForDocumentStart().UnresolvableArmJsonType(tve.TemplateErrorAdditionalInfo.Path ?? "<unknown location>", tve.Message));
}
}
private static ITypeReference ToTypeReferenceIgnoringNullability(SchemaValidationContext context, ITemplateSchemaNode withResolvedRefs, TypeSymbolValidationFlags flags)
{
if (TryGetResourceDerivedType(context, withResolvedRefs, flags) is ITypeReference resourceDerivedType)
{
return resourceDerivedType;
}
return withResolvedRefs.Type.Value switch
{
TemplateParameterType.String => GetStringType(withResolvedRefs, flags),
TemplateParameterType.SecureString => GetStringType(withResolvedRefs, flags | TypeSymbolValidationFlags.IsSecure),
TemplateParameterType.Int => GetIntegerType(withResolvedRefs, flags),
TemplateParameterType.Bool => GetBooleanType(withResolvedRefs, flags),
TemplateParameterType.Array => GetArrayType(context, withResolvedRefs),
TemplateParameterType.Object => GetObjectType(context, withResolvedRefs, flags),
TemplateParameterType.SecureObject => GetObjectType(context, withResolvedRefs, flags | TypeSymbolValidationFlags.IsSecure),
_ => ErrorType.Empty(),
};
}
private static ITypeReference? TryGetResourceDerivedType(SchemaValidationContext context, ITemplateSchemaNode schemaNode, TypeSymbolValidationFlags flags)
{
if (schemaNode.Metadata?.Value is JObject metadataObject &&
metadataObject.TryGetValue(LanguageConstants.MetadataResourceDerivedTypePropertyName, out var resourceType) &&
resourceType is JValue { Value: string resourceTypeString })
{
var fallbackType = ToTypeReference(context, new SansMetadata(schemaNode), flags).Type;
var resourceTypeStringParts = resourceTypeString.Split('#', 2);
var resourceTypeIdentifier = resourceTypeStringParts[0];
var internalPointerSegments = resourceTypeStringParts.Length > 1
? resourceTypeStringParts[1].Split('/').Select(Bicep.Core.Extensions.StringExtensions.Rfc6901Decode).ToImmutableArray()
: ImmutableArray<string>.Empty;
return ResourceTypeReference.TryParse(resourceTypeIdentifier) is ResourceTypeReference resourceTypeReference
? new UnresolvedResourceDerivedType(resourceTypeReference, internalPointerSegments, fallbackType)
: new UnparsableResourceDerivedType(resourceTypeIdentifier, fallbackType);
}
return null;
}
private static TypeSymbol GetStringType(ITemplateSchemaNode schemaNode, TypeSymbolValidationFlags flags)
{
if (schemaNode.AllowedValues?.Value is JArray jArray)
{
return TryGetLiteralUnionType(jArray, t => t.IsTextBasedJTokenType(), b => b.InvalidUnionTypeMember(LanguageConstants.TypeNameString));
}
return TypeFactory.CreateStringType(schemaNode.MinLength?.Value, schemaNode.MaxLength?.Value, flags);
}
private static TypeSymbol TryGetLiteralUnionType(JArray allowedValues, Func<JToken, bool> validator, DiagnosticBuilder.ErrorBuilderDelegate diagnosticOnMismatch)
{
List<TypeSymbol> literalTypeTargets = new();
foreach (var element in allowedValues)
{
if (element.Type == JTokenType.Null)
{
// The compiler was erroneously including `null` in the allowedValues array if the overall type was nullable (e.g., `type foo = ('bar' | 'baz')?`)
// This error has been corrected, but some of those compiled templates may still be out in the wild, so just skip over any `null`s encountered
continue;
}
if (!validator(element) || TypeHelper.TryCreateTypeLiteral(element) is not { } literal)
{
return ErrorType.Create(diagnosticOnMismatch(DiagnosticBuilder.ForDocumentStart()));
}
literalTypeTargets.Add(literal);
}
return TypeHelper.CreateTypeUnion(literalTypeTargets);
}
private static TypeSymbol GetIntegerType(ITemplateSchemaNode schemaNode, TypeSymbolValidationFlags flags)
{
if (schemaNode.AllowedValues?.Value is JArray jArray)
{
return TryGetLiteralUnionType(jArray, t => t.Type == JTokenType.Integer, b => b.InvalidUnionTypeMember(LanguageConstants.TypeNameInt));
}
return TypeFactory.CreateIntegerType(schemaNode.MinValue?.Value, schemaNode.MaxValue?.Value, flags);
}
private static TypeSymbol GetBooleanType(ITemplateSchemaNode schemaNode, TypeSymbolValidationFlags flags)
{
if (schemaNode.AllowedValues?.Value is JArray jArray)
{
return TryGetLiteralUnionType(jArray, t => t.Type == JTokenType.Boolean, b => b.InvalidUnionTypeMember(LanguageConstants.TypeNameBool));
}
return TypeFactory.CreateBooleanType(flags);
}
private static TypeSymbol GetArrayType(SchemaValidationContext context, ITemplateSchemaNode schemaNode)
{
if (schemaNode.AllowedValues?.Value is JArray allowedValues)
{
return GetArrayLiteralType(allowedValues, schemaNode);
}
if (schemaNode.PrefixItems is { } prefixItems)
{
TupleTypeNameBuilder nameBuilder = new();
List<ITypeReference> tupleMembers = new();
foreach (var prefixItem in prefixItems)
{
var (type, typeName) = GetDeferrableTypeInfo(context, prefixItem);
nameBuilder.AppendItem(typeName);
tupleMembers.Add(type);
}
return new TupleType(nameBuilder.ToString(), tupleMembers.ToImmutableArray(), default);
}
if (schemaNode.Items?.SchemaNode is { } items)
{
if (items.Ref?.Value is not null)
{
var (type, typeName) = GetDeferrableTypeInfo(context, items);
return new TypedArrayType($"{typeName}[]", type, default, schemaNode.MinLength?.Value, schemaNode.MaxLength?.Value);
}
return new TypedArrayType(ToTypeReference(context, items), default, schemaNode.MinLength?.Value, schemaNode.MaxLength?.Value);
}
// TODO it's possible to encounter an array with a defined prefix and either a schema or a boolean for "items."
// TupleType does not support an "AdditionalItemsType" for items after the tuple, but when it does, update this type reader to handle the combination of "items" and "prefixItems"
return TypeFactory.CreateArrayType(schemaNode.MinLength?.Value, schemaNode.MaxLength?.Value);
}
private static TypeSymbol GetArrayLiteralType(JArray allowedValues, ITemplateSchemaNode schemaNode)
{
// For allowedValues on an array, either all or none of the allowed values need to be arrays.
if (allowedValues.Any(t => t.Type == JTokenType.Array))
{
// If any of the allowed values are arrays, it's a regular union of literals
return TryGetLiteralUnionType(allowedValues, t => t.Type == JTokenType.Array, b => b.InvalidUnionTypeMember(LanguageConstants.ArrayType));
}
// If no allowed values are arrays, the each element in the array must be one of the allowed values provided
List<TypeSymbol> elements = new();
foreach (var element in allowedValues)
{
// Arrays with constrained but mixed-type literal elements are the only place where `null` is a valid type literal
if (element.Type == JTokenType.Null)
{
elements.Add(LanguageConstants.Null);
}
else if (element.Type == JTokenType.Comment)
{
continue;
}
else if (TypeHelper.TryCreateTypeLiteral(element) is { } literal)
{
elements.Add(literal);
}
else
{
// TryCreateTypeLiteral is exhaustive, so this should never be reached
return ErrorType.Create(DiagnosticBuilder.ForDocumentStart().TypeExpressionLiteralConversionFailed());
}
}
return new TypedArrayType(TypeHelper.CreateTypeUnion(elements), default, schemaNode.MinLength?.Value, schemaNode.MaxLength?.Value);
}
private static (ITypeReference type, string typeName) GetDeferrableTypeInfo(SchemaValidationContext context, ITemplateSchemaNode schemaNode)
=> schemaNode.Ref?.Value switch
{
string @ref => (new DeferredTypeReference(() => ToTypeReference(context, schemaNode).Type), @ref.Replace("#/definitions/", "")),
_ => ToTypeReference(context, schemaNode).Type switch { TypeSymbol concreteType => (concreteType, concreteType.Name) },
};
private static TypeSymbol GetObjectType(SchemaValidationContext context, ITemplateSchemaNode schemaNode, TypeSymbolValidationFlags flags)
{
if (schemaNode.AllowedValues?.Value is JArray jArray)
{
return TryGetLiteralUnionType(jArray, t => t.Type == JTokenType.Object, b => b.InvalidUnionTypeMember(LanguageConstants.ObjectType));
}
if (schemaNode.Discriminator is { } discriminator)
{
var variants = ImmutableArray.CreateBuilder<TypeSymbol>(discriminator.Mapping.Count);
foreach (var mappingEntry in discriminator.Mapping)
{
var variant = TemplateEngine.ResolveSchemaReferences(context, mappingEntry.Value);
variants.Add(TryGetResourceDerivedType(context, variant, flags) is UnresolvedResourceDerivedType resourceDerivedObject
? new UnresolvedResourceDerivedPartialObjectType(resourceDerivedObject.TypeReference,
resourceDerivedObject.PointerSegments,
discriminator.PropertyName.Value,
mappingEntry.Key)
: GetObjectType(
context: context,
properties: schemaNode.Properties.CoalesceEnumerable().Concat(variant.Properties.CoalesceEnumerable()),
requiredProperties: (schemaNode.Required?.Value ?? Array.Empty<string>()).Concat(variant.Required?.Value ?? Array.Empty<string>()),
additionalProperties: variant.AdditionalProperties ?? schemaNode.AdditionalProperties,
flags));
}
return new DiscriminatedObjectType(string.Join(" | ", TypeHelper.GetOrderedTypeNames(variants)), flags, discriminator.PropertyName.Value, variants);
}
return GetObjectType(context, schemaNode.Properties.CoalesceEnumerable(), schemaNode.Required?.Value, schemaNode.AdditionalProperties, flags);
}
private static TypeSymbol GetObjectType(SchemaValidationContext context,
IEnumerable<KeyValuePair<string, TemplateTypeDefinition>> properties,
IEnumerable<string>? requiredProperties,
TemplateBooleanOrSchemaNode? additionalProperties,
TypeSymbolValidationFlags flags)
{
var requiredProps = requiredProperties is not null ? ImmutableHashSet.CreateRange(requiredProperties) : null;
ObjectTypeNameBuilder nameBuilder = new();
List<TypeProperty> propertyList = new();
ITypeReference? additionalPropertiesType = LanguageConstants.Any;
TypePropertyFlags additionalPropertiesFlags = TypePropertyFlags.FallbackProperty;
foreach (var (propertyName, schema) in properties)
{
// depending on the language version, either only properties included in schemaNode.Required are required,
// or all of them are (but some may be nullable)
var required = context.TemplateLanguageVersion?.HasFeature(TemplateLanguageFeature.NullableParameters) == true
|| (requiredProps?.Contains(propertyName) ?? false);
var propertyFlags = required ? TypePropertyFlags.Required : TypePropertyFlags.None;
var description = schema.Metadata?.Value is JObject metadataObject &&
metadataObject.TryGetValue(LanguageConstants.MetadataDescriptionPropertyName, out var descriptionToken) &&
descriptionToken is JValue { Value: string descriptionString }
? descriptionString
: null;
var (type, typeName) = GetDeferrableTypeInfo(context, schema);
propertyList.Add(new(propertyName, type, propertyFlags, description));
nameBuilder.AppendProperty(propertyName, typeName);
}
if (additionalProperties is not null)
{
additionalPropertiesFlags = TypePropertyFlags.None;
if (additionalProperties.SchemaNode is { } additionalPropertiesSchema)
{
var (type, typeName) = GetDeferrableTypeInfo(context, additionalPropertiesSchema);
additionalPropertiesType = type;
nameBuilder.AppendPropertyMatcher("*", typeName);
}
else if (additionalProperties.BooleanValue == false)
{
additionalPropertiesType = null;
}
}
if (propertyList.Count == 0 && additionalProperties is null)
{
return flags.HasFlag(TypeSymbolValidationFlags.IsSecure) ? LanguageConstants.SecureObject : LanguageConstants.Object;
}
return new ObjectType(nameBuilder.ToString(), flags, propertyList, additionalPropertiesType, additionalPropertiesFlags);
}
private class SansMetadata : ITemplateSchemaNode
{
private readonly ITemplateSchemaNode decorated;
internal SansMetadata(ITemplateSchemaNode toDecorate)
{
this.decorated = toDecorate;
}
TemplateGenericProperty<JToken>? ITemplateSchemaNode.Metadata => null;
TemplateGenericProperty<TemplateParameterType> ITemplateSchemaNode.Type => decorated.Type;
TemplateGenericProperty<string> ITemplateSchemaNode.Ref => decorated.Ref;
TemplateGenericProperty<JArray> ITemplateSchemaNode.AllowedValues => decorated.AllowedValues;
TemplateGenericProperty<bool?> ITemplateSchemaNode.Nullable => decorated.Nullable;
TemplateGenericProperty<long?> ITemplateSchemaNode.MinValue => decorated.MinValue;
TemplateGenericProperty<long?> ITemplateSchemaNode.MaxValue => decorated.MaxValue;
TemplateGenericProperty<string> ITemplateSchemaNode.Pattern => decorated.Pattern;
TemplateGenericProperty<long?> ITemplateSchemaNode.MinLength => decorated.MinLength;
TemplateGenericProperty<long?> ITemplateSchemaNode.MaxLength => decorated.MaxLength;
TemplateTypeDefinition[] ITemplateSchemaNode.PrefixItems => decorated.PrefixItems;
TemplateBooleanOrSchemaNode ITemplateSchemaNode.Items => decorated.Items;
InsensitiveDictionary<TemplateTypeDefinition> ITemplateSchemaNode.Properties => decorated.Properties;
TemplateGenericProperty<string[]> ITemplateSchemaNode.Required => decorated.Required;
TemplateBooleanOrSchemaNode ITemplateSchemaNode.AdditionalProperties => decorated.AdditionalProperties;
TemplateGenericProperty<bool?> ITemplateSchemaNode.Sealed => decorated.Sealed;
DiscriminatorConstraintDefinition ITemplateSchemaNode.Discriminator => decorated.Discriminator;
}
}