467 lines
13 KiB
Go
467 lines
13 KiB
Go
package swagger
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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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)
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// ModelBuildable is used for extending Structs that need more control over
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// how the Model appears in the Swagger api declaration.
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type ModelBuildable interface {
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PostBuildModel(m *Model) *Model
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}
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type modelBuilder struct {
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Models *ModelList
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Config *Config
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}
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type documentable 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, retrive 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().(documentable); 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 Model to the builder and detects and calls
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// the post build hook for customizations
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func (b modelBuilder) addModelFrom(sample interface{}) {
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if modelOrNil := b.addModel(reflect.TypeOf(sample), ""); modelOrNil != nil {
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// allow customizations
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if buildable, ok := sample.(ModelBuildable); ok {
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modelOrNil = buildable.PostBuildModel(modelOrNil)
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b.Models.Put(modelOrNil.Id, *modelOrNil)
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}
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}
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}
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func (b modelBuilder) addModel(st reflect.Type, nameOverride string) *Model {
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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 := b.keyFrom(st)
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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.Models.At(modelName); ok {
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return nil
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}
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sm := Model{
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Id: modelName,
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Required: []string{},
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Properties: ModelPropertyList{}}
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// reference the model before further initializing (enables recursive structs)
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b.Models.Put(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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b.addModel(st.Elem(), "")
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return &sm
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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.Put(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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// update model builder with completed model
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b.Models.Put(modelName, sm)
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return &sm
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}
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func (b modelBuilder) isPropertyRequired(field reflect.StructField) bool {
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required := true
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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 modelBuilder) buildProperty(field reflect.StructField, model *Model, modelName string) (jsonName, modelDescription string, prop ModelProperty) {
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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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prop.setPropertyMetadata(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 = &pType
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}
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if prop.Format == "" {
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prop.Format = b.jsonSchemaFormat(b.keyFrom(fieldType))
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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 = &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 = &stringt
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return jsonName, modelDescription, prop
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case fieldKind == reflect.Map:
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// if it's a map, it's unstructured, and swagger 1.2 can't handle it
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objectType := "object"
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prop.Type = &objectType
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return jsonName, modelDescription, prop
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}
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fieldTypeName := b.keyFrom(fieldType)
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if b.isPrimitiveType(fieldTypeName) {
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mapped := b.jsonSchemaType(fieldTypeName)
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prop.Type = &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 := b.keyFrom(fieldType)
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prop.Ref = &modelType
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if fieldType.Name() == "" { // override type of anonymous structs
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nestedTypeName := modelName + "." + jsonName
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prop.Ref = &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 modelBuilder) buildStructTypeProperty(field reflect.StructField, jsonName string, model *Model) (nameJson string, prop ModelProperty) {
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prop.setPropertyMetadata(field)
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// Check for type override in tag
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if prop.Type != nil {
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return jsonName, prop
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}
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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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anonType := model.Id + "." + jsonName
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b.addModel(fieldType, anonType)
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prop.Ref = &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 := modelBuilder{new(ModelList), b.Config}
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sub.addModel(fieldType, "")
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subKey := sub.keyFrom(fieldType)
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// merge properties from sub
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subModel, _ := sub.Models.At(subKey)
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subModel.Properties.Do(func(k string, v ModelProperty) {
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model.Properties.Put(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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sub.Models.Do(func(key string, sub Model) {
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if key != subKey {
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if _, ok := b.Models.At(key); !ok {
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b.Models.Put(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 = b.keyFrom(fieldType)
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prop.Ref = &pType
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return jsonName, prop
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}
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func (b modelBuilder) buildArrayTypeProperty(field reflect.StructField, jsonName, modelName string) (nameJson string, prop ModelProperty) {
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// check for type override in tags
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prop.setPropertyMetadata(field)
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if prop.Type != nil {
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return jsonName, prop
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}
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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 = &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 = &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 = new(Item)
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if isPrimitive {
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mapped := b.jsonSchemaType(elemTypeName)
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prop.Items.Type = &mapped
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} else {
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prop.Items.Ref = &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 modelBuilder) buildPointerTypeProperty(field reflect.StructField, jsonName, modelName string) (nameJson string, prop ModelProperty) {
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prop.setPropertyMetadata(field)
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// Check for type override in tags
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if prop.Type != nil {
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return jsonName, prop
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}
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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 = &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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if isPrimitive {
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primName := b.jsonSchemaType(elemName)
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prop.Items = &Item{Ref: &primName}
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} else {
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prop.Items = &Item{Ref: &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 := b.keyFrom(fieldType.Elem())
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var pType = b.jsonSchemaType(fieldTypeName) // no star, include pkg path
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if b.isPrimitiveType(fieldTypeName) {
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prop.Type = &pType
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prop.Format = b.jsonSchemaFormat(fieldTypeName)
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return jsonName, prop
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}
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prop.Ref = &pType
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elemName := ""
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if fieldType.Elem().Name() == "" {
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elemName = modelName + "." + jsonName
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prop.Ref = &elemName
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}
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b.addModel(fieldType.Elem(), elemName)
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}
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return jsonName, prop
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}
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func (b modelBuilder) getElementTypeName(modelName, jsonName string, t reflect.Type) string {
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if t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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if t.Name() == "" {
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return modelName + "." + jsonName
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}
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return b.keyFrom(t)
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}
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func (b modelBuilder) keyFrom(st reflect.Type) string {
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key := st.String()
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if b.Config != nil && b.Config.ModelTypeNameHandler != nil {
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if name, ok := b.Config.ModelTypeNameHandler(st); ok {
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key = name
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}
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}
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if len(st.Name()) == 0 { // unnamed type
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// Swagger UI has special meaning for [
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key = strings.Replace(key, "[]", "||", -1)
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}
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return key
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}
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// see also https://golang.org/ref/spec#Numeric_types
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func (b modelBuilder) isPrimitiveType(modelName string) bool {
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if len(modelName) == 0 {
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return false
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}
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return strings.Contains("uint uint8 uint16 uint32 uint64 int int8 int16 int32 int64 float32 float64 bool string byte rune time.Time", modelName)
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}
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// jsonNameOfField returns the name of the field as it should appear in JSON format
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// An empty string indicates that this field is not part of the JSON representation
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func (b modelBuilder) jsonNameOfField(field reflect.StructField) 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 s[0] == "-" {
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// empty name signals skip property
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return ""
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} else if s[0] != "" {
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return s[0]
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}
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}
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return field.Name
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}
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// see also http://json-schema.org/latest/json-schema-core.html#anchor8
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func (b modelBuilder) jsonSchemaType(modelName string) string {
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schemaMap := map[string]string{
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"uint": "integer",
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"uint8": "integer",
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"uint16": "integer",
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"uint32": "integer",
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"uint64": "integer",
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"int": "integer",
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"int8": "integer",
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"int16": "integer",
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"int32": "integer",
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"int64": "integer",
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"byte": "integer",
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"float64": "number",
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"float32": "number",
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"bool": "boolean",
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"time.Time": "string",
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}
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mapped, ok := schemaMap[modelName]
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if !ok {
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return modelName // use as is (custom or struct)
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}
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return mapped
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}
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func (b modelBuilder) jsonSchemaFormat(modelName string) string {
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if b.Config != nil && b.Config.SchemaFormatHandler != nil {
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if mapped := b.Config.SchemaFormatHandler(modelName); mapped != "" {
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return mapped
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}
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}
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schemaMap := map[string]string{
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"int": "int32",
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"int32": "int32",
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"int64": "int64",
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"byte": "byte",
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"uint": "integer",
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"uint8": "byte",
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"float64": "double",
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"float32": "float",
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"time.Time": "date-time",
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"*time.Time": "date-time",
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}
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mapped, ok := schemaMap[modelName]
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if !ok {
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return "" // no format
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}
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return mapped
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}
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