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expand.go
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expand.go
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package parser
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/go-faster/errors"
"github.com/ogen-go/ogen"
"github.com/ogen-go/ogen/jsonschema"
"github.com/ogen-go/ogen/location"
"github.com/ogen-go/ogen/openapi"
)
// Expand generates an expanded ogen.Spec from given api.
func Expand(api *openapi.API) (*ogen.Spec, error) {
e := expander{
localToRemote: map[string]localToRemote{},
}
return e.Spec(api)
}
type localToRemote struct {
ref jsonschema.Ref
ptr location.Pointer
}
type expander struct {
components *ogen.Components
localToRemote map[string]localToRemote
}
func (e *expander) Spec(api *openapi.API) (spec *ogen.Spec, err error) {
spec = new(ogen.Spec)
spec.Init()
e.components = spec.Components
spec.OpenAPI = api.Version.String()
// FIXME(tdakkota): store actual information
spec.Info = ogen.Info{
Title: "Expanded spec",
Version: "v0.1.0",
}
if servers := api.Servers; len(servers) > 0 {
expanded := make([]ogen.Server, len(servers))
for i, s := range servers {
expanded[i], err = e.Server(s)
if err != nil {
return nil, errors.Wrapf(err, "expand server [%d]", i)
}
}
spec.Servers = expanded
}
setOperation := func(pi *ogen.PathItem, method string, op *ogen.Operation) error {
var ptr **ogen.Operation
switch strings.ToLower(method) {
case "get":
ptr = &pi.Get
case "put":
ptr = &pi.Put
case "post":
ptr = &pi.Post
case "delete":
ptr = &pi.Delete
case "options":
ptr = &pi.Options
case "head":
ptr = &pi.Head
case "patch":
ptr = &pi.Patch
case "trace":
ptr = &pi.Trace
}
if ptr == nil {
return errors.Errorf("unexpected method %q", method)
}
if existing := *ptr; existing != nil {
return errors.Errorf("path item already contains %q operation", method)
}
*ptr = op
return nil
}
for _, op := range api.Operations {
path := op.Path.String()
expanded, err := e.Operation(op)
if err != nil {
return nil, errors.Wrapf(err, "expand operation %s %s", op.HTTPMethod, path)
}
pi := spec.Paths[path]
if pi == nil {
pi = &ogen.PathItem{}
if spec.Paths == nil {
spec.Paths = ogen.Paths{}
}
spec.Paths[path] = pi
}
if err := setOperation(pi, op.HTTPMethod, expanded); err != nil {
return nil, err
}
}
for _, wh := range api.Webhooks {
for _, op := range wh.Operations {
expanded, err := e.Operation(op)
if err != nil {
return nil, errors.Wrapf(err, "expand webhook operation %s %s", op.HTTPMethod, wh.Name)
}
pi := spec.Webhooks[wh.Name]
if pi == nil {
pi = &ogen.PathItem{}
if spec.Webhooks == nil {
spec.Webhooks = map[string]*ogen.PathItem{}
}
spec.Webhooks[wh.Name] = pi
}
if err := setOperation(pi, op.HTTPMethod, expanded); err != nil {
return nil, err
}
}
}
return spec, nil
}
func (e *expander) Server(s openapi.Server) (expanded ogen.Server, err error) {
expanded.Description = s.Description
var (
template strings.Builder
vars = map[string]ogen.ServerVariable{}
)
for _, part := range s.Template {
if !part.IsParam() {
template.WriteString(part.Raw)
continue
}
param := part.Param
template.WriteByte('{')
template.WriteString(param.Name)
template.WriteByte('}')
vars[param.Name] = ogen.ServerVariable{
Enum: param.Enum,
Default: param.Default,
Description: param.Description,
}
}
expanded.URL = template.String()
if len(vars) > 0 {
expanded.Variables = vars
}
return expanded, nil
}
func (e *expander) SecurityRequirements(reqs openapi.SecurityRequirements) (expanded ogen.SecurityRequirements, err error) {
if reqs == nil {
return nil, nil
}
expanded = make(ogen.SecurityRequirements, len(reqs))
for i, req := range reqs {
expanded[i], err = e.SecurityRequirement(req)
if err != nil {
return nil, errors.Wrapf(err, "expand security requirement [%d]", i)
}
}
return expanded, nil
}
func (e *expander) SecurityRequirement(req openapi.SecurityRequirement) (expanded ogen.SecurityRequirement, err error) {
schemes := req.Schemes
expanded = make(ogen.SecurityRequirement, len(schemes))
for _, ss := range schemes {
expanded[ss.Name] = ss.Scopes
m := e.components.SecuritySchemes
if _, ok := m[ss.Name]; !ok {
m[ss.Name], err = e.SecurityScheme(ss.Security)
if err != nil {
return expanded, errors.Wrapf(err, "expand security scheme %q", ss.Name)
}
}
}
return expanded, nil
}
func (e *expander) SecurityScheme(s openapi.Security) (expanded *ogen.SecurityScheme, err error) {
expanded = new(ogen.SecurityScheme)
expanded.Type = s.Type
expanded.Description = s.Description
expanded.Name = s.Name
expanded.In = s.In
expanded.Scheme = s.Scheme
expanded.BearerFormat = s.BearerFormat
expanded.OpenIDConnectURL = s.OpenIDConnectURL
expanded.Flows, err = e.OAuthFlows(&s.Flows)
if err != nil {
return nil, errors.Wrap(err, "expande oauth flows")
}
return expanded, nil
}
func (e *expander) OAuthFlows(flows *openapi.OAuthFlows) (expanded *ogen.OAuthFlows, err error) {
if flows == nil {
return nil, nil
}
expanded = new(ogen.OAuthFlows)
expanded.Implicit, err = e.OAuthFlow(flows.Implicit)
if err != nil {
return nil, errors.Wrap(err, "expand implicit")
}
expanded.Password, err = e.OAuthFlow(flows.Password)
if err != nil {
return nil, errors.Wrap(err, "expand password")
}
expanded.ClientCredentials, err = e.OAuthFlow(flows.ClientCredentials)
if err != nil {
return nil, errors.Wrap(err, "expand clientCredentials")
}
expanded.AuthorizationCode, err = e.OAuthFlow(flows.AuthorizationCode)
if err != nil {
return nil, errors.Wrap(err, "expand authorizationCode")
}
return expanded, nil
}
func (e *expander) OAuthFlow(flow *openapi.OAuthFlow) (expanded *ogen.OAuthFlow, err error) {
if flow == nil {
return nil, nil
}
expanded = new(ogen.OAuthFlow)
expanded.AuthorizationURL = flow.AuthorizationURL
expanded.TokenURL = flow.TokenURL
expanded.RefreshURL = flow.RefreshURL
expanded.Scopes = flow.Scopes
return expanded, nil
}
func (e *expander) Operation(op *openapi.Operation) (expanded *ogen.Operation, err error) {
expanded = new(ogen.Operation)
expanded.OperationID = op.OperationID
expanded.Summary = op.Summary
expanded.Description = op.Description
expanded.Deprecated = op.Deprecated
expanded.Security, err = e.SecurityRequirements(op.Security)
if err != nil {
return nil, errors.Wrap(err, "expand security")
}
expanded.Parameters, err = e.Parameters(op.Parameters)
if err != nil {
return nil, errors.Wrap(err, "expand parameters")
}
expanded.RequestBody, err = e.RequestBody(op.RequestBody)
if err != nil {
return nil, errors.Wrap(err, "expand requestBody")
}
expanded.Responses, err = e.Responses(op.Responses)
if err != nil {
return nil, errors.Wrap(err, "expand responses")
}
return expanded, nil
}
func (e *expander) Parameters(params []*openapi.Parameter) (expanded []*ogen.Parameter, err error) {
if len(params) == 0 {
return nil, nil
}
expanded = make([]*ogen.Parameter, len(params))
for idx, param := range params {
p, err := e.Parameter(param)
if err != nil {
return nil, errors.Wrapf(err, "expand param %d", idx)
}
expanded[idx] = p
}
return expanded, nil
}
func (e *expander) Parameter(param *openapi.Parameter) (expanded *ogen.Parameter, err error) {
return e.genericParameter(param, "parameters", e.components.Parameters)
}
func (e *expander) genericParameter(
param *openapi.Parameter,
typ string,
m map[string]*ogen.Parameter,
) (expanded *ogen.Parameter, err error) {
expanded = new(ogen.Parameter)
if ref := param.Ref; !ref.IsZero() {
localRef, name, err := e.generateComponentLocalRef("#/components/"+typ+"/", ref, param.Pointer)
if err != nil {
return nil, err
}
ref := &ogen.Parameter{Ref: localRef}
if _, ok := m[name]; !ok {
m[name] = expanded
defer func() {
expanded = ref
}()
} else {
return ref, nil
}
}
expanded.Name = param.Name
expanded.Description = param.Description
expanded.Deprecated = param.Deprecated
expanded.In = param.In.String()
expanded.Style = param.Style.String()
expanded.Explode = ¶m.Explode
expanded.Required = param.Required
expanded.AllowReserved = param.AllowReserved
expanded.Schema, err = e.Schema(param.Schema, nil)
if err != nil {
return nil, errors.Wrap(err, "expand schema")
}
expanded.Content, err = e.ParameterContent(param.Content)
if err != nil {
return nil, errors.Wrap(err, "expand content")
}
return expanded, nil
}
func (e *expander) ParameterContent(content *openapi.ParameterContent) (map[string]ogen.Media, error) {
if content == nil {
return nil, nil
}
return e.Content(map[string]*openapi.MediaType{
content.Name: content.Media,
})
}
func (e *expander) RequestBody(body *openapi.RequestBody) (expanded *ogen.RequestBody, err error) {
if body == nil {
return nil, nil
}
expanded = new(ogen.RequestBody)
if ref := body.Ref; !ref.IsZero() {
localRef, name, err := e.generateComponentLocalRef("#/components/requestBodies/", ref, body.Pointer)
if err != nil {
return nil, err
}
ref := &ogen.RequestBody{Ref: localRef}
m := e.components.RequestBodies
if _, ok := m[name]; !ok {
m[name] = expanded
defer func() {
expanded = ref
}()
} else {
return ref, nil
}
}
expanded.Description = body.Description
expanded.Required = body.Required
expanded.Content, err = e.Content(body.Content)
if err != nil {
return nil, errors.Wrap(err, "expand content")
}
return expanded, nil
}
func (e *expander) Responses(responses openapi.Responses) (expanded ogen.Responses, err error) {
expanded = ogen.Responses{}
for code, resp := range responses.StatusCode {
pattern := strconv.Itoa(code)
expanded[pattern], err = e.Response(resp)
if err != nil {
return nil, errors.Wrapf(err, "expand response %d", code)
}
}
for idx, resp := range responses.Pattern {
if resp == nil {
continue
}
pattern := fmt.Sprintf("%dXX", idx+1)
expanded[pattern], err = e.Response(resp)
if err != nil {
return nil, errors.Wrapf(err, "expand response %s", pattern)
}
}
if resp := responses.Default; resp != nil {
const pattern = "default"
expanded[pattern], err = e.Response(resp)
if err != nil {
return nil, errors.Wrapf(err, "expand response %s", pattern)
}
}
return expanded, nil
}
func (e *expander) Response(resp *openapi.Response) (expanded *ogen.Response, err error) {
expanded = new(ogen.Response)
if ref := resp.Ref; !ref.IsZero() {
localRef, name, err := e.generateComponentLocalRef("#/components/responses/", ref, resp.Pointer)
if err != nil {
return nil, err
}
ref := &ogen.Response{Ref: localRef}
m := e.components.Responses
if _, ok := m[name]; !ok {
m[name] = expanded
defer func() {
expanded = ref
}()
} else {
return ref, nil
}
}
expanded.Description = resp.Description
expanded.Content, err = e.Content(resp.Content)
if err != nil {
return nil, errors.Wrap(err, "expand content")
}
expanded.Headers, err = e.Headers(resp.Headers)
if err != nil {
return nil, errors.Wrap(err, "expand headers")
}
return expanded, nil
}
func (e *expander) Headers(headers map[string]*openapi.Header) (expanded map[string]*ogen.Header, err error) {
expanded = make(map[string]*ogen.Header, len(headers))
for name, h := range headers {
expanded[name], err = e.Header(h)
if err != nil {
return nil, errors.Wrapf(err, "expand header %q", name)
}
}
return expanded, nil
}
func (e *expander) Header(h *openapi.Header) (expanded *ogen.Header, err error) {
// Make a Paramater without "name" and "in".
p := &openapi.Parameter{
Ref: h.Ref,
Description: h.Description,
Deprecated: h.Deprecated,
Schema: h.Schema,
Content: h.Content,
Style: h.Style,
Explode: h.Explode,
Required: h.Required,
AllowReserved: h.AllowReserved,
}
return e.genericParameter(p, "headers", e.components.Headers)
}
func (e *expander) Content(content map[string]*openapi.MediaType) (expanded map[string]ogen.Media, err error) {
if content == nil {
return nil, nil
}
expanded = make(map[string]ogen.Media, len(content))
for name, media := range content {
expanded[name], err = e.Media(media)
if err != nil {
return nil, errors.Wrapf(err, "expand media %q", name)
}
}
return expanded, nil
}
func (e *expander) Media(media *openapi.MediaType) (expanded ogen.Media, err error) {
expanded = ogen.Media{}
expanded.Schema, err = e.Schema(media.Schema, nil)
if err != nil {
return expanded, errors.Wrap(err, "expand schema")
}
if encodings := media.Encoding; len(encodings) > 0 {
expanded.Encoding = make(map[string]ogen.Encoding, len(encodings))
for name, encoding := range encodings {
expanded.Encoding[name], err = e.Encoding(encoding)
if err != nil {
return expanded, errors.Wrapf(err, "expand encoding %q", name)
}
}
}
return expanded, nil
}
func (e *expander) Encoding(media *openapi.Encoding) (expanded ogen.Encoding, err error) {
expanded.ContentType = media.ContentType
expanded.Style = media.Style.String()
expanded.Explode = &media.Explode
expanded.AllowReserved = media.AllowReserved
expanded.Headers, err = e.Headers(media.Headers)
if err != nil {
return expanded, errors.Wrap(err, "expand headers")
}
return expanded, nil
}
func (e *expander) Schema(schema *jsonschema.Schema, walked map[*jsonschema.Schema]*ogen.Schema) (expanded *ogen.Schema, err error) {
if schema == nil {
return nil, nil
}
expanded = new(ogen.Schema)
if ref := schema.Ref; !ref.IsZero() {
localRef, name, err := e.generateComponentLocalRef("#/components/schemas/", ref, schema.Pointer)
if err != nil {
return nil, err
}
ref := &ogen.Schema{Ref: localRef}
m := e.components.Schemas
if _, ok := m[name]; !ok {
m[name] = expanded
defer func() {
expanded = ref
}()
} else {
return ref, nil
}
}
if _, ok := walked[schema]; ok {
return nil, errors.Errorf("recursive schema %q", schema.Ref)
}
if walked == nil {
walked = map[*jsonschema.Schema]*ogen.Schema{}
}
walked[schema] = expanded
defer func() {
delete(walked, schema)
}()
expanded.Type = schema.Type.String()
expanded.Format = schema.Format
expanded.ContentEncoding = schema.ContentEncoding
expanded.ContentMediaType = schema.ContentMediaType
expanded.Summary = schema.Summary
expanded.Description = schema.Description
expanded.Deprecated = schema.Deprecated
expanded.Nullable = schema.Nullable
expanded.XML, err = e.XML(schema.XML)
if err != nil {
return nil, errors.Wrap(err, "expand xml")
}
expanded.Discriminator, err = e.Discriminator(schema.Discriminator)
if err != nil {
return nil, errors.Wrap(err, "expand discriminator")
}
expanded.AnyOf, err = e.Schemas(schema.AnyOf, walked)
if err != nil {
return nil, errors.Wrap(err, "expand anyOf")
}
expanded.OneOf, err = e.Schemas(schema.OneOf, walked)
if err != nil {
return nil, errors.Wrap(err, "expand oneOf")
}
expanded.AllOf, err = e.Schemas(schema.AllOf, walked)
if err != nil {
return nil, errors.Wrap(err, "expand allOf")
}
if enum := schema.Enum; len(enum) > 0 {
expanded.Enum = make(jsonschema.Enum, len(enum))
for i, e := range enum {
raw, err := json.Marshal(e)
if err != nil {
return nil, errors.Wrapf(err, "marshal enum value [%d] %v", i, e)
}
expanded.Enum[i] = raw
}
}
switch schema.Type {
case jsonschema.Object:
expanded.MinProperties = schema.MinProperties
expanded.MaxProperties = schema.MaxProperties
if props := schema.Properties; len(props) > 0 {
expanded.Properties = make(ogen.Properties, len(props))
for i, prop := range props {
propSchema, err := e.Schema(prop.Schema, walked)
if err != nil {
return nil, errors.Wrapf(err, "expand property %q", prop.Name)
}
expanded.Properties[i] = ogen.Property{
Name: prop.Name,
Schema: propSchema,
}
if prop.Required {
expanded.Required = append(expanded.Required, prop.Name)
}
}
}
if ap := schema.AdditionalProperties; ap != nil {
expandedAp := &ogen.AdditionalProperties{}
if item := schema.Item; item != nil {
s, err := e.Schema(item, walked)
if err != nil {
return nil, errors.Wrap(err, "expand additionalProperties")
}
if s != nil {
expandedAp.Schema = *s
}
} else {
v := new(bool)
*v = *ap
expandedAp.Bool = v
}
expanded.AdditionalProperties = expandedAp
}
if patternProps := schema.PatternProperties; len(patternProps) > 0 {
expanded.PatternProperties = make(ogen.PatternProperties, len(patternProps))
for i, prop := range patternProps {
propSchema, err := e.Schema(prop.Schema, walked)
if err != nil {
return nil, errors.Wrapf(err, "expand pattern property %q", prop.Pattern)
}
expanded.Properties[i] = ogen.Property{
Name: prop.Pattern.String(),
Schema: propSchema,
}
}
}
case jsonschema.Array:
expanded.MinItems = schema.MinItems
expanded.MaxItems = schema.MaxItems
expanded.UniqueItems = schema.UniqueItems
var item *ogen.Schema
item, err = e.Schema(schema.Item, walked)
if err != nil {
return nil, errors.Wrap(err, "expand items")
}
expanded.Items = &ogen.Items{
Item: item,
}
case jsonschema.Integer, jsonschema.Number:
expanded.Minimum = schema.Minimum
expanded.ExclusiveMinimum = schema.ExclusiveMinimum
expanded.Maximum = schema.Maximum
expanded.ExclusiveMaximum = schema.ExclusiveMaximum
expanded.MultipleOf = schema.MultipleOf
case jsonschema.String:
expanded.MinLength = schema.MinLength
expanded.MaxLength = schema.MaxLength
expanded.Pattern = schema.Pattern
case jsonschema.Boolean:
case jsonschema.Null:
}
return expanded, nil
}
func (e *expander) Schemas(schemas []*jsonschema.Schema, walked map[*jsonschema.Schema]*ogen.Schema) (expanded []*ogen.Schema, err error) {
if len(schemas) == 0 {
return nil, nil
}
expanded = make([]*ogen.Schema, len(schemas))
for i, s := range schemas {
expanded[i], err = e.Schema(s, walked)
if err != nil {
return nil, errors.Wrapf(err, "expand %d", i)
}
}
return expanded, nil
}
func (e *expander) Discriminator(d *jsonschema.Discriminator) (expanded *ogen.Discriminator, _ error) {
if d == nil {
return nil, nil
}
expanded = new(ogen.Discriminator)
expanded.PropertyName = d.PropertyName
if m := d.Mapping; len(m) > 0 {
expanded.Mapping = make(map[string]string, len(m))
for k, s := range m {
if s.Ref.IsZero() {
return nil, errors.Errorf("mapping %q has empty ref", k)
}
localRef, _, err := e.generateComponentLocalRef("#/components/schemas/", s.Ref, s.Pointer)
if err != nil {
return nil, errors.Wrapf(err, "mapping %q name", k)
}
expanded.Mapping[k] = localRef
}
}
return expanded, nil
}
func (e *expander) XML(xml *jsonschema.XML) (expanded *ogen.XML, _ error) {
if xml == nil {
return nil, nil
}
expanded = new(ogen.XML)
expanded.Name = xml.Name
expanded.Namespace = xml.Namespace
expanded.Prefix = xml.Prefix
expanded.Attribute = xml.Attribute
expanded.Wrapped = xml.Wrapped
return expanded, nil
}
func (e *expander) generateComponentName(ref jsonschema.Ref) (string, error) {
ptr := ref.Ptr
idx := strings.LastIndexByte(ptr, '/')
if idx < 0 || ptr[idx+1:] == "" {
return "", errors.Errorf("can't generate component name for %q", ref)
}
return ptr[idx+1:], nil
}
func (e *expander) generateComponentLocalRef(
prefix string,
ref jsonschema.Ref,
parentPtr location.Pointer,
) (localRef, name string, err error) {
name, err = e.generateComponentName(ref)
if err != nil {
return "", "", err
}
localRef = prefix + name
if existing, ok := e.localToRemote[localRef]; ok && existing.ref != ref {
me := new(location.MultiError)
me.ReportPtr(existing.ptr, fmt.Sprintf("local ref %q conflict: %q", localRef, existing.ref))
me.ReportPtr(parentPtr, fmt.Sprintf("and %q", ref))
return "", "", me
}
e.localToRemote[localRef] = localToRemote{
ref: ref,
ptr: parentPtr,
}
return localRef, name, nil
}