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openapi.go
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openapi.go
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package importer
import (
"bytes"
"fmt"
"net/url"
"path/filepath"
"reflect"
"runtime"
"sort"
"strings"
"github.com/getkin/kin-openapi/openapi3"
"github.com/sirupsen/logrus"
"github.com/spf13/afero"
)
type openapiv3 struct {
appName string
pkg string
basePath string // Used for Swagger2.0 files which have a basePath field
logger *logrus.Logger
fs afero.Fs
types TypeList
nameStack []string
}
func NewOpenAPILoader(logger *logrus.Logger, fs afero.Fs) *openapi3.SwaggerLoader {
loader := openapi3.NewSwaggerLoader()
loader.IsExternalRefsAllowed = true
loader.LoadSwaggerFromURIFunc = func(
loader *openapi3.SwaggerLoader, url *url.URL) (swagger *openapi3.Swagger, err error) {
if url.Host == "" && url.Scheme == "" {
logger.Debugf("Loading openapi ref: %s", url.String())
data, err := afero.ReadFile(fs, pathFromURL(url))
if err != nil {
return nil, err
}
if strings.Contains(string(data), "swagger:") {
swagger, _, err = convertToOpenAPI3(data, url, loader)
} else {
swagger, err = loader.LoadSwaggerFromDataWithPath(data, url)
}
if err != nil {
return nil, err
}
return swagger, loader.ResolveRefsIn(swagger, url)
}
return nil, fmt.Errorf("unable to load openapi URI: %s", url.String())
}
return loader
}
func NewOpenAPIV3Importer(logger *logrus.Logger, fs afero.Fs) Importer {
return &openapiv3{
logger: logger,
fs: fs,
}
}
func (o *openapiv3) WithAppName(appName string) Importer {
o.appName = appName
return o
}
func (o *openapiv3) WithPackage(packageName string) Importer {
o.pkg = packageName
return o
}
func (o *openapiv3) Load(file string) (string, error) {
loader := NewOpenAPILoader(o.logger, o.fs)
spec, err := loader.LoadSwaggerFromFile(file)
if err != nil {
spec, _ = loader.LoadSwaggerFromData([]byte(file)) // nolint: errcheck
}
return o.convertSpec(spec)
}
func (o *openapiv3) pushName(n string) func() {
o.nameStack = append(o.nameStack, n)
return func() {
o.popName()
}
}
func (o *openapiv3) popName() { o.nameStack = o.nameStack[:len(o.nameStack)-1] }
func orderedKeys(mapObj interface{}) []string {
var typeNames []string
for _, k := range reflect.ValueOf(mapObj).MapKeys() {
typeNames = append(typeNames, k.String())
}
sort.Strings(typeNames)
return typeNames
}
func (o *openapiv3) convertSpec(spec *openapi3.Swagger) (string, error) {
o.types = TypeList{}
for _, name := range orderedKeys(spec.Components.Schemas) {
ref := spec.Components.Schemas[name]
if _, found := o.types.Find(name); !found {
if ref.Value == nil {
o.types.Add(NewStringAlias(name))
} else {
o.types.Add(o.loadTypeSchema(name, ref.Value))
}
}
}
endpoints := make(map[string][]Endpoint, len(methodDisplayOrder))
for _, k := range methodDisplayOrder {
endpoints[k] = nil
}
for path, ep := range spec.Paths {
meps := o.buildEndpoint(path, ep)
for _, mep := range meps {
endpoints[mep.Method] = append(endpoints[mep.Method], mep.Endpoints...)
}
}
o.types.Sort()
meps := make([]MethodEndpoints, 0, len(methodDisplayOrder))
for _, k := range methodDisplayOrder {
me := MethodEndpoints{
Method: k,
Endpoints: endpoints[k],
}
sort.Slice(me.Endpoints, func(i, j int) bool {
return strings.Compare(me.Endpoints[i].Path, me.Endpoints[j].Path) < 0
})
meps = append(meps, me)
}
result := &bytes.Buffer{}
err := newWriter(result, o.logger).Write(o.buildSyslInfo(spec, o.basePath), o.types, meps...)
return result.String(), err
}
func (o *openapiv3) buildSyslInfo(spec *openapi3.Swagger, basepath string) SyslInfo {
info := SyslInfo{
OutputData: OutputData{
AppName: o.appName,
Package: o.pkg,
},
Title: spec.Info.Title,
Description: spec.Info.Description,
OtherFields: []string{},
}
values := []string{
"version", spec.Info.Version,
"termsOfService", spec.Info.TermsOfService,
"basePath", basepath,
}
if spec.Info.License != nil {
values = append(values, "license", spec.Info.License.Name)
}
if len(spec.Servers) > 0 {
u, err := url.Parse(spec.Servers[0].URL)
if err == nil {
values = append(values, "host", u.Hostname())
}
}
for i := 0; i < len(values); i += 2 {
key := values[i]
val := values[i+1]
if val != "" {
info.OtherFields = append(info.OtherFields, key, val)
}
}
return info
}
const openapiv3DefinitionPrefix = "#/components/schemas/"
func sortProperties(props FieldList) {
sort.SliceStable(props, func(i, j int) bool {
return strings.Compare(props[i].Name, props[j].Name) < 0
})
}
func attrsForArray(schema *openapi3.Schema) []string {
var attrs []string
for name, fn := range map[string]func() string{
"min": func() string { return fmt.Sprint(schema.MinItems) },
"max": func() string {
if schema.MaxItems != nil {
return fmt.Sprint(*schema.MaxItems)
}
return ""
},
} {
if val := fn(); val != "" {
attrs = append(attrs, fmt.Sprintf(`%s="%s"`, name, val))
}
}
return attrs
}
func attrsForString(schema *openapi3.Schema) []string {
var attrs []string
for name, fn := range map[string]func() string{
"min": func() string { return fmt.Sprint(schema.MinLength) },
"max": func() string {
if schema.MaxLength != nil {
return fmt.Sprint(*schema.MaxLength)
}
return ""
},
"regex": func() string { return schema.Pattern },
} {
if val := fn(); val != "" {
attrs = append(attrs, fmt.Sprintf(`%s="%s"`, name, val))
}
}
return attrs
}
func getAttrs(schema *openapi3.Schema) []string {
switch schema.Type {
case ArrayTypeName:
return attrsForArray(schema)
case ObjectTypeName:
case StringTypeName:
return attrsForString(schema)
case "integer", "int":
}
return nil
}
func typeNameFromSchemaRef(ref *openapi3.SchemaRef) string {
if idx := strings.Index(ref.Ref, openapiv3DefinitionPrefix); idx >= 0 {
return getSyslSafeName(strings.TrimPrefix(ref.Ref[idx:], openapiv3DefinitionPrefix))
}
switch ref.Value.Type {
case ArrayTypeName:
return typeNameFromSchemaRef(ref.Value.Items)
case ObjectTypeName, "":
return ObjectTypeName
case "boolean":
return "bool"
case StringTypeName, "integer", "number":
return mapSwaggerTypeAndFormatToType(ref.Value.Type, ref.Value.Format, logrus.StandardLogger())
default:
return getSyslSafeName(ref.Value.Type)
}
}
func nameOnlyType(name string) Type {
return &SyslBuiltIn{name: name}
}
func (o *openapiv3) typeAliasForSchema(ref *openapi3.SchemaRef) Type {
name := typeNameFromSchemaRef(ref)
t, found := o.types.Find(name)
if !found {
t = nameOnlyType(name)
}
if name == ObjectTypeName {
t = nameOnlyType(strings.Join(o.nameStack, "_"))
}
if _, ok := t.(*Array); !ok && ref.Value.Type == "array" {
return &Array{Items: t}
}
return t
}
func makeSizeSpec(min uint64, max *uint64) *sizeSpec {
switch {
case min > 0 && max != nil:
return &sizeSpec{
Min: int(min),
Max: int(*max),
MaxType: MaxSpecified,
}
case min > 0:
return &sizeSpec{
Min: int(min),
MaxType: OpenEnded,
}
}
return nil
}
func (o *openapiv3) buildField(name string, prop *openapi3.SchemaRef) Field {
f := Field{Name: name}
typeName := typeNameFromSchemaRef(prop)
if prop.Ref != "" {
f.Type = nameOnlyType(typeName)
return f
}
defer o.pushName(name)()
if prop.Value.Type == ArrayTypeName && prop.Value.Items.Ref != "" {
f.Type = &Array{Items: nameOnlyType(typeNameFromSchemaRef(prop.Value.Items))}
f.SizeSpec = makeSizeSpec(prop.Value.MinItems, prop.Value.MaxItems)
return f
}
f.Type = o.typeAliasForSchema(prop)
isArray := prop.Value.Type == ArrayTypeName
if typeName == ObjectTypeName {
if isArray {
prop = prop.Value.Items
}
ns := o.nameStack
o.nameStack = nil
defer func() { o.nameStack = ns }()
t := o.loadTypeSchema(strings.Join(ns, "_"), prop.Value)
o.types.Add(t)
if isArray && prop.Ref == "" {
f.Type = &Array{Items: t}
} else {
f.Type = t
}
} else if typeName == StringTypeName {
f.SizeSpec = makeSizeSpec(prop.Value.MinLength, prop.Value.MaxLength)
f.Attributes = attrsForStrings(prop.Value)
}
return f
}
func attrsForStrings(schema *openapi3.Schema) []string {
var attrs []string
if r := schema.Pattern; r != "" {
attrs = append(attrs, fmt.Sprintf(`regex="%s"`, getSyslSafeName(r)))
}
if e := schema.Enum; len(e) != 0 && false { // remove the `&& false` when enum_values are added
var vals []string
for _, opt := range e {
vals = append(vals, fmt.Sprintf(`"%s"`, opt))
}
sort.Strings(vals)
attrs = append(attrs, fmt.Sprintf(`enum_values=[%s]`, strings.Join(vals, ", ")))
}
return attrs
}
func (o *openapiv3) loadTypeSchema(name string, schema *openapi3.Schema) Type {
name = getSyslSafeName(name)
defer o.pushName(name)()
switch schema.Type {
case "array":
var items Type
if childName := typeNameFromSchemaRef(schema.Items); childName == ObjectTypeName {
defer o.pushName("obj")()
items = o.loadTypeSchema(name+"_obj", schema.Items.Value)
o.types.Add(items)
} else {
items = o.typeAliasForSchema(schema.Items)
}
return &Array{name: name, Items: items, Attrs: getAttrs(schema)}
case ObjectTypeName, "":
obj := &StandardType{
name: name,
Properties: nil,
Attributes: getAttrs(schema),
}
// Removing this as it breaks an import file. Details here: https://github.com/anzx/acceleration/issues/342
// AllOf means this object is composed of all of the sub-schemas (and potentially additional properties)
// for _, subschema := range schema.AllOf {
// subType := o.loadTypeSchema("", subschema.Value)
// if subObj, ok := subType.(*StandardType); ok {
// obj.Properties = append(obj.Properties, subObj.Properties...)
// }
// }
for fname, prop := range schema.Properties {
f := o.buildField(fname, prop)
f.Optional = !contains(fname, schema.Required)
obj.Properties = append(obj.Properties, f)
}
if len(obj.Properties) == 0 {
return NewStringAlias(name)
}
sortProperties(obj.Properties)
return obj
default:
if schema.Type == "string" && schema.Enum != nil {
return &Enum{name: name, Attrs: attrsForStrings(schema)}
}
if t, ok := checkBuiltInTypes(mapSwaggerTypeAndFormatToType(schema.Type, schema.Format, o.logger)); ok {
return &Alias{name: name, Target: t}
}
o.logger.Warnf("unknown scheme type: %s", schema.Type)
return NewStringAlias(name)
}
}
func (o *openapiv3) buildEndpoint(path string, item *openapi3.PathItem) []MethodEndpoints {
var res []MethodEndpoints
ops := map[string]*openapi3.Operation{
"GET": item.Get,
"PUT": item.Put,
"POST": item.Post,
"DELETE": item.Delete,
"PATCH": item.Patch,
}
commonParams := o.buildParams(item.Parameters)
for method, op := range ops {
if op == nil {
continue
}
me := MethodEndpoints{Method: method}
ep := Endpoint{
Path: getSyslSafeName(path),
Description: op.Description,
Params: commonParams.Extend(o.buildParams(op.Parameters)),
Responses: nil,
}
if req := op.RequestBody; req != nil {
for mediaType, obj := range req.Value.Content {
param := Param{In: "body"}
param.Field = o.fieldForMediaType(mediaType, obj.Schema, "Request")
ep.Params.Add(param)
}
}
typePrefix := getSyslSafeName(convertToSyslSafe(cleanEndpointPath(path))) + "_"
for statusCode, resp := range op.Responses {
text := "error"
if statusCode[0] == '2' {
text = "ok"
}
respType := &StandardType{
name: typePrefix + text,
Properties: FieldList{},
}
for mediaType, val := range resp.Value.Content {
f := o.fieldForMediaType(mediaType, val.Schema, "")
respType.Properties = append(respType.Properties, f)
}
for name := range resp.Value.Headers {
f := Field{
Name: name,
Attributes: []string{"~header"},
}
if f.Type == nil {
f.Type = StringAlias
}
respType.Properties = append(respType.Properties, f)
}
r := Response{Text: text}
if len(respType.Properties) > 0 {
if len(respType.Properties) == 1 && respType.Properties[0].Attributes[0] != "~header" {
r.Type = respType.Properties[0].Type
} else {
sortProperties(respType.Properties)
o.types.Add(respType)
r.Type = respType
}
}
ep.Responses = append(ep.Responses, r)
}
me.Endpoints = append(me.Endpoints, ep)
res = append(res, me)
}
return res
}
func (o *openapiv3) buildParams(params openapi3.Parameters) Parameters {
var out Parameters
for _, item := range params {
name := item.Value.Name
if item.Value.In == "query" {
name = convertToSyslSafe(name)
}
p := Param{
Field: o.buildField(name, item.Value.Schema),
In: item.Value.In,
}
// Avoid putting sequences into the params
if a, ok := p.Field.Type.(*Array); ok {
p.Field.Type = o.types.AddAndRet(&Alias{name: item.Value.Name, Target: a})
}
p.Optional = !item.Value.Required
out.Add(p)
}
return out
}
func (o *openapiv3) fieldForMediaType(mediatype string, schema *openapi3.SchemaRef, typeSuffix string) Field {
tname := typeNameFromSchemaRef(schema)
field := o.buildField(tname+typeSuffix, schema)
if _, found := o.types.Find(tname); !found {
o.types.Add(o.loadTypeSchema(tname, schema.Value))
}
if a, ok := field.Type.(*Array); ok && typeSuffix == "Request" {
field.Type = o.types.AddAndRet(&Alias{name: field.Name, Target: a})
}
if mediatype != "" {
field.Attributes = append(field.Attributes, fmt.Sprintf(`mediatype="%s"`, mediatype))
}
return field
}
func pathToURL(filename string) (*url.URL, error) {
if runtime.GOOS == "windows" {
// Windows pathing doesnt work well with the openapi3 package, so we need to fudge the URL for refs to work
u, err := url.Parse("file:///" + filepath.ToSlash(filename))
if err != nil {
return nil, err
}
u.Scheme = ""
return u, nil
}
return url.Parse(filename)
}
func pathFromURL(u *url.URL) string {
if runtime.GOOS == "windows" {
return filepath.FromSlash(u.Path[1:])
}
return u.Path
}