494 lines
14 KiB
Go
494 lines
14 KiB
Go
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package restfulspec
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import (
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"encoding/json"
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"reflect"
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"strings"
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"github.com/go-openapi/spec"
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)
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type definitionBuilder struct {
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Definitions spec.Definitions
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Config Config
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}
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// Documented is
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type Documented interface {
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SwaggerDoc() map[string]string
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}
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// Check if this structure has a method with signature func (<theModel>) SwaggerDoc() map[string]string
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// If it exists, retrieve the documentation and overwrite all struct tag descriptions
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func getDocFromMethodSwaggerDoc2(model reflect.Type) map[string]string {
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if docable, ok := reflect.New(model).Elem().Interface().(Documented); ok {
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return docable.SwaggerDoc()
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}
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return make(map[string]string)
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}
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// addModelFrom creates and adds a Schema to the builder and detects and calls
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// the post build hook for customizations
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func (b definitionBuilder) addModelFrom(sample interface{}) {
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b.addModel(reflect.TypeOf(sample), "")
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}
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func (b definitionBuilder) addModel(st reflect.Type, nameOverride string) *spec.Schema {
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// Turn pointers into simpler types so further checks are
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// correct.
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if st.Kind() == reflect.Ptr {
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st = st.Elem()
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}
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modelName := keyFrom(st, b.Config)
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if nameOverride != "" {
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modelName = nameOverride
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}
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// no models needed for primitive types
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if b.isPrimitiveType(modelName) {
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return nil
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}
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// golang encoding/json packages says array and slice values encode as
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// JSON arrays, except that []byte encodes as a base64-encoded string.
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// If we see a []byte here, treat it at as a primitive type (string)
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// and deal with it in buildArrayTypeProperty.
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if (st.Kind() == reflect.Slice || st.Kind() == reflect.Array) &&
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st.Elem().Kind() == reflect.Uint8 {
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return nil
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}
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// see if we already have visited this model
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if _, ok := b.Definitions[modelName]; ok {
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return nil
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}
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sm := spec.Schema{
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SchemaProps: spec.SchemaProps{
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Required: []string{},
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Properties: map[string]spec.Schema{},
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},
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}
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// reference the model before further initializing (enables recursive structs)
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b.Definitions[modelName] = sm
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// check for slice or array
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if st.Kind() == reflect.Slice || st.Kind() == reflect.Array {
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st = st.Elem()
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}
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// check for structure or primitive type
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if st.Kind() != reflect.Struct {
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return &sm
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}
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fullDoc := getDocFromMethodSwaggerDoc2(st)
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modelDescriptions := []string{}
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for i := 0; i < st.NumField(); i++ {
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field := st.Field(i)
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jsonName, modelDescription, prop := b.buildProperty(field, &sm, modelName)
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if len(modelDescription) > 0 {
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modelDescriptions = append(modelDescriptions, modelDescription)
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}
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// add if not omitted
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if len(jsonName) != 0 {
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// update description
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if fieldDoc, ok := fullDoc[jsonName]; ok {
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prop.Description = fieldDoc
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}
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// update Required
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if b.isPropertyRequired(field) {
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sm.Required = append(sm.Required, jsonName)
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}
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sm.Properties[jsonName] = prop
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}
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}
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// We always overwrite documentation if SwaggerDoc method exists
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// "" is special for documenting the struct itself
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if modelDoc, ok := fullDoc[""]; ok {
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sm.Description = modelDoc
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} else if len(modelDescriptions) != 0 {
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sm.Description = strings.Join(modelDescriptions, "\n")
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}
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// Needed to pass openapi validation. This field exists for json-schema compatibility,
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// but it conflicts with the openapi specification.
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// See https://github.com/go-openapi/spec/issues/23 for more context
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sm.ID = ""
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// update model builder with completed model
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b.Definitions[modelName] = sm
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return &sm
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}
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func (b definitionBuilder) isPropertyRequired(field reflect.StructField) bool {
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required := true
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if optionalTag := field.Tag.Get("optional"); optionalTag == "true" {
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return false
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}
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if jsonTag := field.Tag.Get("json"); jsonTag != "" {
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s := strings.Split(jsonTag, ",")
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if len(s) > 1 && s[1] == "omitempty" {
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return false
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}
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}
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return required
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}
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func (b definitionBuilder) buildProperty(field reflect.StructField, model *spec.Schema, modelName string) (jsonName, modelDescription string, prop spec.Schema) {
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jsonName = b.jsonNameOfField(field)
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if len(jsonName) == 0 {
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// empty name signals skip property
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return "", "", prop
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}
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if field.Name == "XMLName" && field.Type.String() == "xml.Name" {
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// property is metadata for the xml.Name attribute, can be skipped
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return "", "", prop
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}
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if tag := field.Tag.Get("modelDescription"); tag != "" {
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modelDescription = tag
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}
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setPropertyMetadata(&prop, field)
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if prop.Type != nil {
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return jsonName, modelDescription, prop
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}
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fieldType := field.Type
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// check if type is doing its own marshalling
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marshalerType := reflect.TypeOf((*json.Marshaler)(nil)).Elem()
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if fieldType.Implements(marshalerType) {
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var pType = "string"
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if prop.Type == nil {
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prop.Type = []string{pType}
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}
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if prop.Format == "" {
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prop.Format = b.jsonSchemaFormat(keyFrom(fieldType, b.Config))
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}
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return jsonName, modelDescription, prop
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}
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// check if annotation says it is a string
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if jsonTag := field.Tag.Get("json"); jsonTag != "" {
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s := strings.Split(jsonTag, ",")
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if len(s) > 1 && s[1] == "string" {
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stringt := "string"
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prop.Type = []string{stringt}
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return jsonName, modelDescription, prop
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}
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}
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fieldKind := fieldType.Kind()
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switch {
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case fieldKind == reflect.Struct:
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jsonName, prop := b.buildStructTypeProperty(field, jsonName, model)
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return jsonName, modelDescription, prop
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case fieldKind == reflect.Slice || fieldKind == reflect.Array:
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jsonName, prop := b.buildArrayTypeProperty(field, jsonName, modelName)
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return jsonName, modelDescription, prop
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case fieldKind == reflect.Ptr:
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jsonName, prop := b.buildPointerTypeProperty(field, jsonName, modelName)
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return jsonName, modelDescription, prop
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case fieldKind == reflect.String:
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stringt := "string"
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prop.Type = []string{stringt}
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return jsonName, modelDescription, prop
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case fieldKind == reflect.Map:
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jsonName, prop := b.buildMapTypeProperty(field, jsonName, modelName)
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return jsonName, modelDescription, prop
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}
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fieldTypeName := keyFrom(fieldType, b.Config)
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if b.isPrimitiveType(fieldTypeName) {
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mapped := b.jsonSchemaType(fieldTypeName)
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prop.Type = []string{mapped}
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prop.Format = b.jsonSchemaFormat(fieldTypeName)
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return jsonName, modelDescription, prop
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}
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modelType := keyFrom(fieldType, b.Config)
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prop.Ref = spec.MustCreateRef("#/definitions/" + modelType)
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if fieldType.Name() == "" { // override type of anonymous structs
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// FIXME: Still need a way to handle anonymous struct model naming.
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nestedTypeName := modelName + "." + jsonName
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prop.Ref = spec.MustCreateRef("#/definitions/" + nestedTypeName)
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b.addModel(fieldType, nestedTypeName)
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}
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return jsonName, modelDescription, prop
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}
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func hasNamedJSONTag(field reflect.StructField) bool {
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parts := strings.Split(field.Tag.Get("json"), ",")
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if len(parts) == 0 {
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return false
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}
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for _, s := range parts[1:] {
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if s == "inline" {
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return false
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}
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}
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return len(parts[0]) > 0
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}
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func (b definitionBuilder) buildStructTypeProperty(field reflect.StructField, jsonName string, model *spec.Schema) (nameJson string, prop spec.Schema) {
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setPropertyMetadata(&prop, field)
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fieldType := field.Type
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// check for anonymous
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if len(fieldType.Name()) == 0 {
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// anonymous
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// FIXME: Still need a way to handle anonymous struct model naming.
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anonType := model.ID + "." + jsonName
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b.addModel(fieldType, anonType)
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prop.Ref = spec.MustCreateRef("#/definitions/" + anonType)
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return jsonName, prop
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}
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if field.Name == fieldType.Name() && field.Anonymous && !hasNamedJSONTag(field) {
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// embedded struct
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sub := definitionBuilder{make(spec.Definitions), b.Config}
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sub.addModel(fieldType, "")
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subKey := keyFrom(fieldType, b.Config)
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// merge properties from sub
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subModel, _ := sub.Definitions[subKey]
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for k, v := range subModel.Properties {
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model.Properties[k] = v
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// if subModel says this property is required then include it
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required := false
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for _, each := range subModel.Required {
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if k == each {
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required = true
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break
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}
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}
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if required {
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model.Required = append(model.Required, k)
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}
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}
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// add all new referenced models
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for key, sub := range sub.Definitions {
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if key != subKey {
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if _, ok := b.Definitions[key]; !ok {
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b.Definitions[key] = sub
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}
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}
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}
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// empty name signals skip property
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return "", prop
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}
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// simple struct
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b.addModel(fieldType, "")
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var pType = keyFrom(fieldType, b.Config)
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prop.Ref = spec.MustCreateRef("#/definitions/" + pType)
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return jsonName, prop
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}
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func (b definitionBuilder) buildArrayTypeProperty(field reflect.StructField, jsonName, modelName string) (nameJson string, prop spec.Schema) {
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setPropertyMetadata(&prop, field)
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fieldType := field.Type
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if fieldType.Elem().Kind() == reflect.Uint8 {
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stringt := "string"
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prop.Type = []string{stringt}
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return jsonName, prop
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}
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var pType = "array"
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prop.Type = []string{pType}
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isPrimitive := b.isPrimitiveType(fieldType.Elem().Name())
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elemTypeName := b.getElementTypeName(modelName, jsonName, fieldType.Elem())
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prop.Items = &spec.SchemaOrArray{
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Schema: &spec.Schema{},
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}
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if isPrimitive {
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mapped := b.jsonSchemaType(elemTypeName)
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prop.Items.Schema.Type = []string{mapped}
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} else {
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prop.Items.Schema.Ref = spec.MustCreateRef("#/definitions/" + elemTypeName)
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}
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// add|overwrite model for element type
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if fieldType.Elem().Kind() == reflect.Ptr {
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fieldType = fieldType.Elem()
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}
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if !isPrimitive {
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b.addModel(fieldType.Elem(), elemTypeName)
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}
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return jsonName, prop
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}
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func (b definitionBuilder) buildMapTypeProperty(field reflect.StructField, jsonName, modelName string) (nameJson string, prop spec.Schema) {
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setPropertyMetadata(&prop, field)
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fieldType := field.Type
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var pType = "object"
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prop.Type = []string{pType}
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// As long as the element isn't an interface, we should be able to figure out what the
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// intended type is and represent it in `AdditionalProperties`.
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// See: https://swagger.io/docs/specification/data-models/dictionaries/
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if fieldType.Elem().Kind().String() != "interface" {
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isPrimitive := b.isPrimitiveType(fieldType.Elem().Name())
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elemTypeName := b.getElementTypeName(modelName, jsonName, fieldType.Elem())
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prop.AdditionalProperties = &spec.SchemaOrBool{
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Schema: &spec.Schema{},
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}
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if isPrimitive {
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mapped := b.jsonSchemaType(elemTypeName)
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prop.AdditionalProperties.Schema.Type = []string{mapped}
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} else {
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prop.AdditionalProperties.Schema.Ref = spec.MustCreateRef("#/definitions/" + elemTypeName)
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}
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// add|overwrite model for element type
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if fieldType.Elem().Kind() == reflect.Ptr {
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fieldType = fieldType.Elem()
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}
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if !isPrimitive {
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b.addModel(fieldType.Elem(), elemTypeName)
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}
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}
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return jsonName, prop
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}
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func (b definitionBuilder) buildPointerTypeProperty(field reflect.StructField, jsonName, modelName string) (nameJson string, prop spec.Schema) {
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setPropertyMetadata(&prop, field)
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fieldType := field.Type
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// override type of pointer to list-likes
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if fieldType.Elem().Kind() == reflect.Slice || fieldType.Elem().Kind() == reflect.Array {
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var pType = "array"
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prop.Type = []string{pType}
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isPrimitive := b.isPrimitiveType(fieldType.Elem().Elem().Name())
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elemName := b.getElementTypeName(modelName, jsonName, fieldType.Elem().Elem())
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prop.Items = &spec.SchemaOrArray{
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Schema: &spec.Schema{},
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}
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if isPrimitive {
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primName := b.jsonSchemaType(elemName)
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prop.Items.Schema.Type = []string{primName}
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} else {
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prop.Items.Schema.Ref = spec.MustCreateRef("#/definitions/" + elemName)
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}
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if !isPrimitive {
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// add|overwrite model for element type
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b.addModel(fieldType.Elem().Elem(), elemName)
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}
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} else {
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// non-array, pointer type
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|
|
fieldTypeName := keyFrom(fieldType.Elem(), b.Config)
|
||
|
|
var pType = b.jsonSchemaType(fieldTypeName) // no star, include pkg path
|
||
|
|
if b.isPrimitiveType(fieldTypeName) {
|
||
|
|
prop.Type = []string{pType}
|
||
|
|
prop.Format = b.jsonSchemaFormat(fieldTypeName)
|
||
|
|
return jsonName, prop
|
||
|
|
}
|
||
|
|
prop.Ref = spec.MustCreateRef("#/definitions/" + pType)
|
||
|
|
elemName := ""
|
||
|
|
if fieldType.Elem().Name() == "" {
|
||
|
|
elemName = modelName + "." + jsonName
|
||
|
|
prop.Ref = spec.MustCreateRef("#/definitions/" + elemName)
|
||
|
|
}
|
||
|
|
b.addModel(fieldType.Elem(), elemName)
|
||
|
|
}
|
||
|
|
return jsonName, prop
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b definitionBuilder) getElementTypeName(modelName, jsonName string, t reflect.Type) string {
|
||
|
|
if t.Kind() == reflect.Ptr {
|
||
|
|
t = t.Elem()
|
||
|
|
}
|
||
|
|
if t.Name() == "" {
|
||
|
|
return modelName + "." + jsonName
|
||
|
|
}
|
||
|
|
return keyFrom(t, b.Config)
|
||
|
|
}
|
||
|
|
|
||
|
|
func keyFrom(st reflect.Type, cfg Config) string {
|
||
|
|
key := st.String()
|
||
|
|
if cfg.ModelTypeNameHandler != nil {
|
||
|
|
if name, ok := cfg.ModelTypeNameHandler(st); ok {
|
||
|
|
key = name
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if len(st.Name()) == 0 { // unnamed type
|
||
|
|
// If it is an array, remove the leading []
|
||
|
|
key = strings.TrimPrefix(key, "[]")
|
||
|
|
// Swagger UI has special meaning for [
|
||
|
|
key = strings.Replace(key, "[]", "||", -1)
|
||
|
|
}
|
||
|
|
return key
|
||
|
|
}
|
||
|
|
|
||
|
|
// see also https://golang.org/ref/spec#Numeric_types
|
||
|
|
func (b definitionBuilder) isPrimitiveType(modelName string) bool {
|
||
|
|
if len(modelName) == 0 {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
return strings.Contains("uint uint8 uint16 uint32 uint64 int int8 int16 int32 int64 float32 float64 bool string byte rune time.Time", modelName)
|
||
|
|
}
|
||
|
|
|
||
|
|
// jsonNameOfField returns the name of the field as it should appear in JSON format
|
||
|
|
// An empty string indicates that this field is not part of the JSON representation
|
||
|
|
func (b definitionBuilder) jsonNameOfField(field reflect.StructField) string {
|
||
|
|
if jsonTag := field.Tag.Get("json"); jsonTag != "" {
|
||
|
|
s := strings.Split(jsonTag, ",")
|
||
|
|
if s[0] == "-" {
|
||
|
|
// empty name signals skip property
|
||
|
|
return ""
|
||
|
|
} else if s[0] != "" {
|
||
|
|
return s[0]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return field.Name
|
||
|
|
}
|
||
|
|
|
||
|
|
// see also http://json-schema.org/latest/json-schema-core.html#anchor8
|
||
|
|
func (b definitionBuilder) jsonSchemaType(modelName string) string {
|
||
|
|
schemaMap := map[string]string{
|
||
|
|
"uint": "integer",
|
||
|
|
"uint8": "integer",
|
||
|
|
"uint16": "integer",
|
||
|
|
"uint32": "integer",
|
||
|
|
"uint64": "integer",
|
||
|
|
|
||
|
|
"int": "integer",
|
||
|
|
"int8": "integer",
|
||
|
|
"int16": "integer",
|
||
|
|
"int32": "integer",
|
||
|
|
"int64": "integer",
|
||
|
|
|
||
|
|
"byte": "integer",
|
||
|
|
"float64": "number",
|
||
|
|
"float32": "number",
|
||
|
|
"bool": "boolean",
|
||
|
|
"time.Time": "string",
|
||
|
|
}
|
||
|
|
mapped, ok := schemaMap[modelName]
|
||
|
|
if !ok {
|
||
|
|
return modelName // use as is (custom or struct)
|
||
|
|
}
|
||
|
|
return mapped
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b definitionBuilder) jsonSchemaFormat(modelName string) string {
|
||
|
|
if b.Config.SchemaFormatHandler != nil {
|
||
|
|
if mapped := b.Config.SchemaFormatHandler(modelName); mapped != "" {
|
||
|
|
return mapped
|
||
|
|
}
|
||
|
|
}
|
||
|
|
schemaMap := map[string]string{
|
||
|
|
"int": "int32",
|
||
|
|
"int32": "int32",
|
||
|
|
"int64": "int64",
|
||
|
|
"byte": "byte",
|
||
|
|
"uint": "integer",
|
||
|
|
"uint8": "byte",
|
||
|
|
"float64": "double",
|
||
|
|
"float32": "float",
|
||
|
|
"time.Time": "date-time",
|
||
|
|
"*time.Time": "date-time",
|
||
|
|
}
|
||
|
|
mapped, ok := schemaMap[modelName]
|
||
|
|
if !ok {
|
||
|
|
return "" // no format
|
||
|
|
}
|
||
|
|
return mapped
|
||
|
|
}
|