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package io.udash
package rest.openapi
import com.avsystem.commons._
import com.avsystem.commons.annotation.positioned
import com.avsystem.commons.meta._
import com.avsystem.commons.misc.ValueOf
import com.avsystem.commons.rpc.AsRaw
import com.avsystem.commons.serialization._
import io.udash.rest.openapi.adjusters._
import io.udash.rest.raw._
sealed trait RestStructure[T] extends TypedMetadata[T] {
def schemaAdjusters: List[SchemaAdjuster]
def standaloneSchema: RestSchema[T]
def info: GenInfo[T]
protected def applyAdjusters(schema: Schema): Schema =
schemaAdjusters.foldRight(schema)(_ adjustSchema _)
}
object RestStructure extends AdtMetadataCompanion[RestStructure] {
private object ShallowInliningResolver extends SchemaResolver {
def resolve(schema: RestSchema[_]): RefOr[Schema] =
schema.name.fold(schema.createSchema(this))(RefOr.ref)
}
@positioned(positioned.here) final case class Union[T](
@multi @reifyAnnot schemaAdjusters: List[SchemaAdjuster],
@adtCaseMetadata @multi cases: List[Case[_]],
@infer schemaName: GeneratedSchemaName[T],
@composite info: GenUnionInfo[T],
) extends RestStructure[T] {
def standaloneSchema: RestSchema[T] =
RestSchema.create(createSchema, schemaName.name.toOptArg)
private def createSchema(resolver: SchemaResolver): RefOr[Schema] = {
val caseFieldOpt = info.flatten.map(_.caseFieldName)
val caseSchemas = cases.map { c =>
val baseSchema = resolver.resolve(c.caseSchema(caseFieldOpt))
if (caseFieldOpt.nonEmpty) baseSchema
else RefOr(Schema(
`type` = DataType.Object,
properties = IListMap(c.info.rawName -> baseSchema),
required = List(c.info.rawName)
))
}
val disc = caseFieldOpt.map { caseFieldName =>
val mapping = IListMap((cases zip caseSchemas).collect {
case (c, RefOr.Ref(ref)) => (c.info.rawName, ref)
}: _*)
Discriminator(caseFieldName, mapping)
}
RefOr(applyAdjusters(Schema(
`type` = DataType.Object,
oneOf = caseSchemas,
discriminator = disc.toOptArg
)))
}
}
object Union extends AdtMetadataCompanion[Union]
sealed trait Case[T] extends TypedMetadata[T] {
def info: GenCaseInfo[T]
def caseSchema(caseFieldName: Opt[String]): RestSchema[T]
}
object Case extends AdtMetadataCompanion[Case]
/**
* Will be inferred for case types that already have [[io.udash.rest.openapi.RestSchema RestSchema]] defined directly.
*
* For flat sealed hierarchy, if the existing [[RestSchema]] already has expected discriminator field it will be
* returned unchanged (in order to preserve original schema name), otherwise new schema instance will be created with
* additional single-value enum field.
*/
@positioned(positioned.here) final case class CustomCase[T](
@checked @infer restSchema: RestSchema[T],
@infer schemaName: GeneratedSchemaName[T],
@composite info: GenCaseInfo[T],
) extends Case[T] {
def caseSchema(caseFieldName: Opt[String]): RestSchema[T] =
caseFieldName.fold(restSchema) { cfn =>
val caseFieldSchema = RefOr(Schema.enumOf(List(info.rawName)))
// Creates new schema with additional discriminator field.
// Used only if case schema does not already contain the discriminator field.
//
// If the case schema is unnamed or has different name than specified by its `SchemaName`,
// it means that someone has manually overridden the schema name directly on `RestSchema` instance.
// We can take advantage of that situation and reuse the `SchemaName` for the name of the _tagged_
// case schema, i.e. the schema with added discriminator field.
// Otherwise we must generate another, unique schema name, which we do by prepending
// the original name with prefix "tagged".
//
def schemaWithDiscriminatorField: RestSchema[T] = {
val preferredTaggedSchemaName = schemaName.name.getOrElse(info.rawName)
val taggedName =
if (restSchema.name.contains(preferredTaggedSchemaName)) s"tagged$preferredTaggedSchemaName"
else preferredTaggedSchemaName
restSchema.map({
case RefOr.Value(caseSchema) => caseSchema.copy(
properties = caseSchema.properties + (cfn -> caseFieldSchema),
required = cfn :: caseSchema.required
)
case ref => Schema(allOf = List(RefOr(Schema(
`type` = DataType.Object,
properties = IListMap(cfn -> caseFieldSchema),
required = List(cfn)
)), ref))
}, taggedName)
}
// `restSchema` needs to be resolved in-place to check for discriminator field
restSchema.createSchema(ShallowInliningResolver) match {
case RefOr.Value(caseSchema) =>
// Check if schema contains discriminator field
caseSchema.properties.getOpt(cfn) match {
case Opt(existingDiscriminator) =>
if (existingDiscriminator != caseFieldSchema) {
// If existing field has different schema than expected, report an error
throw new IllegalArgumentException(
s"Cannot materialize schema for ${info.sourceName}, discriminator field conflict"
)
}
// When provided `restSchema` already contains the expected discriminator field just return it unchanged
restSchema
case Opt.Empty =>
// If there's no discriminator field, we must manually add it and create a new case schema
schemaWithDiscriminatorField
}
case _ =>
// Case schema is a hardcoded, opaque reference to an external schema - generate new schema with the
// discriminator field.
schemaWithDiscriminatorField
}
}
}
/**
* Will be inferred for types having apply/unapply(Seq) pair in their companion.
*/
@positioned(positioned.here) final case class Record[T](
@multi @reifyAnnot schemaAdjusters: List[SchemaAdjuster],
@adtParamMetadata @allowOptional @multi fields: List[Field[_]],
@infer schemaName: GeneratedSchemaName[T],
@composite info: GenCaseInfo[T],
) extends RestStructure[T] with Case[T] {
def standaloneSchema: RestSchema[T] =
RestSchema.create(createSchema(_, Opt.Empty), schemaName.name.toOptArg)
def caseSchema(caseFieldName: Opt[String]): RestSchema[T] =
RestSchema.create(createSchema(_, caseFieldName), caseFieldName.flatMap(_ => schemaName.name).toOptArg)
private def createSchema(resolver: SchemaResolver, caseFieldName: Opt[String]): RefOr[Schema] =
(fields, caseFieldName) match {
case (single :: Nil, Opt.Empty) if info.transparent =>
SchemaAdjuster.adjustRef(schemaAdjusters, resolver.resolve(single.restSchema))
case _ =>
val props = caseFieldName.map(cfn => (cfn, RefOr(Schema.enumOf(List(info.rawName))))).iterator ++
fields.iterator.map(f => (f.info.rawName, f.resolveSchema(resolver)))
val required = caseFieldName.iterator ++
fields.iterator.filterNot(_.optional).map(_.info.rawName)
RefOr(applyAdjusters(Schema(`type` = DataType.Object,
properties = IListMap(props.toList: _*),
required = required.toList
)))
}
}
object Record extends AdtMetadataCompanion[Record]
/**
* Will be inferred for singleton types (objects).
*/
@positioned(positioned.here) final case class Singleton[T](
@multi @reifyAnnot schemaAdjusters: List[SchemaAdjuster],
@infer @checked value: ValueOf[T],
@infer schemaName: GeneratedSchemaName[T],
@composite info: GenCaseInfo[T]
) extends RestStructure[T] with Case[T] {
def standaloneSchema: RestSchema[T] =
RestSchema.create(createSchema(_, Opt.Empty))
def caseSchema(caseFieldName: Opt[String]): RestSchema[T] =
RestSchema.create(createSchema(_, caseFieldName), caseFieldName.flatMap(_ => schemaName.name).toOptArg)
def createSchema(resolver: SchemaResolver, caseFieldName: Opt[String]): RefOr[Schema] =
RefOr(applyAdjusters(Schema(`type` = DataType.Object,
properties = IListMap(caseFieldName.map(cfn => (cfn, RefOr(Schema.enumOf(List(info.rawName))))).toList: _*),
required = caseFieldName.toList
)))
}
object Singleton extends AdtMetadataCompanion[Singleton]
final case class Field[T](
@composite info: GenParamInfo[T],
@infer restSchema: RestSchema[T],
@optional @composite whenAbsentInfo: Opt[WhenAbsentInfo[T]],
@optional @composite defaultValueInfo: Opt[DefaultValueInfo[T]],
@multi @reifyAnnot schemaAdjusters: List[SchemaAdjuster]
) extends TypedMetadata[T] {
val fallbackValue: Opt[JsonValue] =
if (info.optional) Opt.Empty
else (whenAbsentInfo.map(_.fallbackValue) orElse defaultValueInfo.map(_.fallbackValue)).flatten
val optional: Boolean = info.optional || fallbackValue.isDefined
def resolveSchema(resolver: SchemaResolver): RefOr[Schema] = {
val bareSchema = resolver.resolve(restSchema).withDefaultValue(fallbackValue)
SchemaAdjuster.adjustRef(schemaAdjusters, bareSchema)
}
}
final case class DefaultValueInfo[T](
@reifyDefaultValue defaultValue: DefaultValue[T],
@infer("Cannot materialize default parameter value:\n") asJson: AsRaw[JsonValue, T]
) extends TypedMetadata[T] {
val fallbackValue: Opt[JsonValue] =
Try(defaultValue.value).toOpt.map(asJson.asRaw)
}
final case class NameAndAdjusters[T](
@reifyName sourceName: String,
@optional @reifyAnnot annotName: Opt[name],
@multi @reifyAnnot schemaAdjusters: List[SchemaAdjuster]
) extends TypedMetadata[T] {
def restSchema(wrappedSchema: RestSchema[_]): RestSchema[T] = RestSchema.create(
r => SchemaAdjuster.adjustRef(schemaAdjusters, r.resolve(wrappedSchema)),
annotName.fold(sourceName)(_.name)
)
}
object NameAndAdjusters extends AdtMetadataCompanion[NameAndAdjusters]
}
