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// Copyright 2019 DeepMap, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package codegen
import (
"bufio"
"bytes"
"context"
"embed"
"errors"
"fmt"
"go/scanner"
"io"
"io/fs"
"net/http"
"os"
"runtime/debug"
"sort"
"strings"
"text/template"
"time"
"github.com/getkin/kin-openapi/openapi3"
"golang.org/x/tools/imports"
"github.com/oapi-codegen/oapi-codegen/v2/pkg/util"
)
// Embed the templates directory
//
//go:embed templates
var templates embed.FS
// globalState stores all global state. Please don't put global state anywhere
// else so that we can easily track it.
var globalState struct {
options Configuration
spec *openapi3.T
importMapping importMap
// initialismsMap stores initialisms as "lower(initialism) -> initialism" map.
// List of initialisms was taken from https://staticcheck.io/docs/configuration/options/#initialisms.
initialismsMap map[string]string
// typeMapping is the merged type mapping (defaults + user overrides).
typeMapping TypeMapping
// resolvedNames maps schema path strings (e.g. "components/schemas/Pet")
// to their resolved Go type names, assigned by the multi-pass name resolver.
resolvedNames map[string]string
// resolvedClientWrapperNames maps operationID to the resolved Go type name
// for client response wrapper types (e.g., "createChatCompletion" -> "CreateChatCompletionResponseWrapper").
resolvedClientWrapperNames map[string]string
}
// goImport represents a go package to be imported in the generated code
type goImport struct {
Name string // package name
Path string // package path
}
// String returns a go import statement
func (gi goImport) String() string {
if gi.Name != "" {
return fmt.Sprintf("%s %q", gi.Name, gi.Path)
}
return fmt.Sprintf("%q", gi.Path)
}
// importMap maps external OpenAPI specifications files/urls to external go packages
type importMap map[string]goImport
// importMappingCurrentPackage allows an Import Mapping to map to the current package, rather than an external package.
// This allows users to split their OpenAPI specification across multiple files, but keep them in the same package, which can reduce a bit of the overhead for users.
// We use `-` to indicate that this is a bit of a special case
const importMappingCurrentPackage = "-"
// GoImports returns a slice of go import statements
func (im importMap) GoImports() []string {
goImports := make([]string, 0, len(im))
for _, v := range im {
if v.Path == importMappingCurrentPackage {
continue
}
goImports = append(goImports, v.String())
}
return goImports
}
func constructImportMapping(importMapping map[string]string) importMap {
var (
pathToImport = importMap{}
result = importMap{}
)
{
var packagePaths []string
for _, packageName := range importMapping {
packagePaths = append(packagePaths, packageName)
}
sort.Strings(packagePaths)
for _, packagePath := range packagePaths {
if _, ok := pathToImport[packagePath]; !ok && packagePath != importMappingCurrentPackage {
split := strings.Split(packagePath, " ")
if len(split) == 2 {
// if we have 2 parts, we assume both the package name and path are provided, and we use them as is
pathToImport[packagePath] = goImport{
Name: split[0],
Path: split[1],
}
} else {
// otherwise, we auto-generate a package name based on the order of the imports, to ensure deterministic output
pathToImport[packagePath] = goImport{
Name: fmt.Sprintf("externalRef%d", len(pathToImport)),
Path: packagePath,
}
}
}
}
}
for specPath, packagePath := range importMapping {
if packagePath == importMappingCurrentPackage {
result[specPath] = goImport{
Path: importMappingCurrentPackage,
}
} else {
result[specPath] = pathToImport[packagePath]
}
}
return result
}
// Generate uses the Go templating engine to generate all of our server wrappers from
// the descriptions we've built up above from the schema objects.
// opts defines
func Generate(spec *openapi3.T, opts Configuration) (string, error) {
// This is global state
globalState.options = opts
globalState.spec = spec
globalState.importMapping = constructImportMapping(opts.ImportMapping)
if opts.OutputOptions.TypeMapping != nil {
globalState.typeMapping = DefaultTypeMapping.Merge(*opts.OutputOptions.TypeMapping)
} else {
globalState.typeMapping = DefaultTypeMapping
}
filterOperationsByTag(spec, opts)
filterOperationsByOperationID(spec, opts)
if !opts.OutputOptions.SkipPrune {
pruneUnusedComponents(spec)
}
// if we are provided an override for the response type suffix update it
if opts.OutputOptions.ResponseTypeSuffix != "" {
responseTypeSuffix = opts.OutputOptions.ResponseTypeSuffix
}
if globalState.options.OutputOptions.ClientTypeName == "" {
globalState.options.OutputOptions.ClientTypeName = defaultClientTypeName
}
nameNormalizerFunction := NameNormalizerFunction(opts.OutputOptions.NameNormalizer)
nameNormalizer = NameNormalizers[nameNormalizerFunction]
if nameNormalizer == nil {
return "", fmt.Errorf(`the name-normalizer option %v could not be found among options %q`,
opts.OutputOptions.NameNormalizer, NameNormalizers.Options())
}
if nameNormalizerFunction != NameNormalizerFunctionToCamelCaseWithInitialisms && len(opts.OutputOptions.AdditionalInitialisms) > 0 {
return "", fmt.Errorf("you have specified `additional-initialisms`, but the `name-normalizer` is not set to `ToCamelCaseWithInitialisms`. Please specify `name-normalizer: ToCamelCaseWithInitialisms` or remove the `additional-initialisms` configuration")
}
globalState.initialismsMap = makeInitialismsMap(opts.OutputOptions.AdditionalInitialisms)
// Multi-pass name resolution: gather all schemas, then resolve names globally.
// Only enabled when resolve-type-name-collisions is set.
if true { // HACK
gathered := GatherSchemas(spec, opts)
globalState.resolvedNames = ResolveNames(gathered)
// Build a separate operationID -> wrapper name lookup for genResponseTypeName.
// Keys must use the normalized operationID (via nameNormalizer) because
// OperationDefinition.OperationId is normalized before templates run.
globalState.resolvedClientWrapperNames = make(map[string]string)
for _, gs := range gathered {
if gs.Context == ContextClientResponseWrapper && gs.OperationID != "" {
if name, ok := globalState.resolvedNames[gs.Path.String()]; ok {
normalizedOpID := nameNormalizer(gs.OperationID)
globalState.resolvedClientWrapperNames[normalizedOpID] = name
}
}
}
} else {
globalState.resolvedNames = nil
globalState.resolvedClientWrapperNames = nil
}
// This creates the golang templates text package
TemplateFunctions["opts"] = func() Configuration { return globalState.options }
t := template.New("oapi-codegen").Funcs(TemplateFunctions)
// This parses all of our own template files into the template object
// above
err := LoadTemplates(templates, t)
if err != nil {
return "", fmt.Errorf("error parsing oapi-codegen templates: %w", err)
}
// load user-provided templates. Will Override built-in versions.
for name, template := range opts.OutputOptions.UserTemplates {
utpl := t.New(name)
txt, err := GetUserTemplateText(template)
if err != nil {
return "", fmt.Errorf("error loading user-provided template %q: %w", name, err)
}
_, err = utpl.Parse(txt)
if err != nil {
return "", fmt.Errorf("error parsing user-provided template %q: %w", name, err)
}
}
ops, err := OperationDefinitions(spec, opts.OutputOptions.InitialismOverrides)
if err != nil {
return "", fmt.Errorf("error creating operation definitions: %w", err)
}
xGoTypeImports, err := OperationImports(ops)
if err != nil {
return "", fmt.Errorf("error getting operation imports: %w", err)
}
var typeDefinitions, constantDefinitions string
if opts.Generate.Models {
typeDefinitions, err = GenerateTypeDefinitions(t, spec, ops, opts.OutputOptions.ExcludeSchemas)
if err != nil {
return "", fmt.Errorf("error generating type definitions: %w", err)
}
constantDefinitions, err = GenerateConstants(t, ops)
if err != nil {
return "", fmt.Errorf("error generating constants: %w", err)
}
imprts, err := GetTypeDefinitionsImports(spec, opts.OutputOptions.ExcludeSchemas)
if err != nil {
return "", fmt.Errorf("error getting type definition imports: %w", err)
}
MergeImports(xGoTypeImports, imprts)
}
var serverURLsDefinitions string
if opts.Generate.ServerURLs {
serverURLsDefinitions, err = GenerateServerURLs(t, spec)
if err != nil {
return "", fmt.Errorf("error generating Server URLs: %w", err)
}
}
var irisServerOut string
if opts.Generate.IrisServer {
irisServerOut, err = GenerateIrisServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var echoServerOut string
if opts.Generate.EchoServer {
echoServerOut, err = GenerateEchoServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var chiServerOut string
if opts.Generate.ChiServer {
chiServerOut, err = GenerateChiServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var fiberServerOut string
if opts.Generate.FiberServer {
fiberServerOut, err = GenerateFiberServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var ginServerOut string
if opts.Generate.GinServer {
ginServerOut, err = GenerateGinServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var gorillaServerOut string
if opts.Generate.GorillaServer {
gorillaServerOut, err = GenerateGorillaServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var stdHTTPServerOut string
if opts.Generate.StdHTTPServer {
stdHTTPServerOut, err = GenerateStdHTTPServer(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var strictServerOut string
if opts.Generate.Strict {
var responses []ResponseDefinition
if spec.Components != nil {
responses, err = GenerateResponseDefinitions("", spec.Components.Responses)
if err != nil {
return "", fmt.Errorf("error generation response definitions for schema: %w", err)
}
}
strictServerResponses, err := GenerateStrictResponses(t, responses)
if err != nil {
return "", fmt.Errorf("error generation response definitions for schema: %w", err)
}
strictServerOut, err = GenerateStrictServer(t, ops, opts)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
strictServerOut = strictServerResponses + strictServerOut
}
var clientOut string
if opts.Generate.Client {
clientOut, err = GenerateClient(t, ops)
if err != nil {
return "", fmt.Errorf("error generating client: %w", err)
}
}
var clientWithResponsesOut string
if opts.Generate.Client {
clientWithResponsesOut, err = GenerateClientWithResponses(t, ops)
if err != nil {
return "", fmt.Errorf("error generating client with responses: %w", err)
}
}
var inlinedSpec string
if opts.Generate.EmbeddedSpec {
inlinedSpec, err = GenerateInlinedSpec(t, globalState.importMapping, spec)
if err != nil {
return "", fmt.Errorf("error generating Go handlers for Paths: %w", err)
}
}
var buf bytes.Buffer
w := bufio.NewWriter(&buf)
externalImports := append(globalState.importMapping.GoImports(), importMap(xGoTypeImports).GoImports()...)
importsOut, err := GenerateImports(
t,
externalImports,
opts.PackageName,
opts.NoVCSVersionOverride,
)
if err != nil {
return "", fmt.Errorf("error generating imports: %w", err)
}
_, err = w.WriteString(importsOut)
if err != nil {
return "", fmt.Errorf("error writing imports: %w", err)
}
_, err = w.WriteString(constantDefinitions)
if err != nil {
return "", fmt.Errorf("error writing constants: %w", err)
}
_, err = w.WriteString(serverURLsDefinitions)
if err != nil {
return "", fmt.Errorf("error writing Server URLs: %w", err)
}
_, err = w.WriteString(typeDefinitions)
if err != nil {
return "", fmt.Errorf("error writing type definitions: %w", err)
}
if opts.Generate.Client {
_, err = w.WriteString(clientOut)
if err != nil {
return "", fmt.Errorf("error writing client: %w", err)
}
_, err = w.WriteString(clientWithResponsesOut)
if err != nil {
return "", fmt.Errorf("error writing client: %w", err)
}
}
if opts.Generate.IrisServer {
_, err = w.WriteString(irisServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.EchoServer {
_, err = w.WriteString(echoServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.ChiServer {
_, err = w.WriteString(chiServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.FiberServer {
_, err = w.WriteString(fiberServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.GinServer {
_, err = w.WriteString(ginServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.GorillaServer {
_, err = w.WriteString(gorillaServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.StdHTTPServer {
_, err = w.WriteString(stdHTTPServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.Strict {
_, err = w.WriteString(strictServerOut)
if err != nil {
return "", fmt.Errorf("error writing server path handlers: %w", err)
}
}
if opts.Generate.EmbeddedSpec {
_, err = w.WriteString(inlinedSpec)
if err != nil {
return "", fmt.Errorf("error writing inlined spec: %w", err)
}
}
err = w.Flush()
if err != nil {
return "", fmt.Errorf("error flushing output buffer: %w", err)
}
// remove any byte-order-marks which break Go-Code
goCode := SanitizeCode(buf.String())
// The generation code produces unindented horrors. Use the Go Imports
// to make it all pretty.
if opts.OutputOptions.SkipFmt {
return goCode, nil
}
outBytes, err := imports.Process(opts.PackageName+".go", []byte(goCode), nil)
if err != nil {
// if we don't get a line number
errLine := -1
var scanErr scanner.ErrorList
if errors.As(err, &scanErr) && scanErr.Len() > 0 {
// for now, only return the first error's information
errLine = scanErr[0].Pos.Line
}
return "", fmt.Errorf("error formatting Go code:\n%s\nerror was: %w", addLineNumbers(goCode, errLine), err)
}
return string(outBytes), nil
}
func addLineNumbers(goCode string, lineWithError int) string {
var out []string
lines := strings.Split(goCode, "\n")
for i, line := range lines {
// lines for humans start at 1
lineNumber := i + 1
errLine := " "
if lineNumber == lineWithError {
errLine = "❗"
}
out = append(out, fmt.Sprintf("%s%5d: %s", errLine, lineNumber, line))
}
return strings.Join(out, "\n")
}
func GenerateTypeDefinitions(t *template.Template, swagger *openapi3.T, ops []OperationDefinition, excludeSchemas []string) (string, error) {
var allTypes []TypeDefinition
if swagger.Components != nil {
schemaTypes, err := GenerateTypesForSchemas(t, swagger.Components.Schemas, excludeSchemas)
if err != nil {
return "", fmt.Errorf("error generating Go types for component schemas: %w", err)
}
paramTypes, err := GenerateTypesForParameters(t, swagger.Components.Parameters)
if err != nil {
return "", fmt.Errorf("error generating Go types for component parameters: %w", err)
}
allTypes = append(schemaTypes, paramTypes...)
responseTypes, err := GenerateTypesForResponses(t, swagger.Components.Responses)
if err != nil {
return "", fmt.Errorf("error generating Go types for component responses: %w", err)
}
allTypes = append(allTypes, responseTypes...)
bodyTypes, err := GenerateTypesForRequestBodies(t, swagger.Components.RequestBodies)
if err != nil {
return "", fmt.Errorf("error generating Go types for component request bodies: %w", err)
}
allTypes = append(allTypes, bodyTypes...)
}
// Go through all operations, and add their types to allTypes, so that we can
// scan all of them for enums. Operation definitions are handled differently
// from the rest, so let's keep track of enumTypes separately, which will contain
// all types needed to be scanned for enums, which includes those within operations.
enumTypes := allTypes
for _, op := range ops {
enumTypes = append(enumTypes, op.TypeDefinitions...)
}
operationsOut, err := GenerateTypesForOperations(t, ops)
if err != nil {
return "", fmt.Errorf("error generating Go types for component request bodies: %w", err)
}
enumsOut, err := GenerateEnums(t, enumTypes)
if err != nil {
return "", fmt.Errorf("error generating code for type enums: %w", err)
}
typesOut, err := GenerateTypes(t, allTypes)
if err != nil {
return "", fmt.Errorf("error generating code for type definitions: %w", err)
}
allOfBoilerplate, err := GenerateAdditionalPropertyBoilerplate(t, allTypes)
if err != nil {
return "", fmt.Errorf("error generating allOf boilerplate: %w", err)
}
unionBoilerplate, err := GenerateUnionBoilerplate(t, allTypes)
if err != nil {
return "", fmt.Errorf("error generating union boilerplate: %w", err)
}
unionAndAdditionalBoilerplate, err := GenerateUnionAndAdditionalProopertiesBoilerplate(t, allTypes)
if err != nil {
return "", fmt.Errorf("error generating boilerplate for union types with additionalProperties: %w", err)
}
typeDefinitions := strings.Join([]string{enumsOut, typesOut, operationsOut, allOfBoilerplate, unionBoilerplate, unionAndAdditionalBoilerplate}, "")
return typeDefinitions, nil
}
// GenerateConstants generates operation ids, context keys, paths, etc. to be exported as constants
func GenerateConstants(t *template.Template, ops []OperationDefinition) (string, error) {
constants := Constants{
SecuritySchemeProviderNames: []string{},
}
providerNameMap := map[string]struct{}{}
for _, op := range ops {
for _, def := range op.SecurityDefinitions {
providerName := SanitizeGoIdentity(def.ProviderName)
providerNameMap[providerName] = struct{}{}
}
}
var providerNames []string
for providerName := range providerNameMap {
providerNames = append(providerNames, providerName)
}
sort.Strings(providerNames)
constants.SecuritySchemeProviderNames = append(constants.SecuritySchemeProviderNames, providerNames...)
return GenerateTemplates([]string{"constants.tmpl"}, t, constants)
}
// GenerateTypesForSchemas generates type definitions for any custom types defined in the
// components/schemas section of the Swagger spec.
func GenerateTypesForSchemas(t *template.Template, schemas map[string]*openapi3.SchemaRef, excludeSchemas []string) ([]TypeDefinition, error) {
excludeSchemasMap := make(map[string]bool)
for _, schema := range excludeSchemas {
excludeSchemasMap[schema] = true
}
types := make([]TypeDefinition, 0)
// We're going to define Go types for every object under components/schemas
for _, schemaName := range SortedSchemaKeys(schemas) {
if _, ok := excludeSchemasMap[schemaName]; ok {
continue
}
schemaRef := schemas[schemaName]
goSchema, err := GenerateGoSchema(schemaRef, []string{schemaName})
if err != nil {
return nil, fmt.Errorf("error converting Schema %s to Go type: %w", schemaName, err)
}
goTypeName, err := renameSchema(schemaName, schemaRef)
if err != nil {
return nil, fmt.Errorf("error making name for components/schemas/%s: %w", schemaName, err)
}
if resolved := resolvedNameForComponent("schemas", schemaName); resolved != "" {
goTypeName = resolved
}
types = append(types, TypeDefinition{
JsonName: schemaName,
TypeName: goTypeName,
Schema: goSchema,
})
types = append(types, goSchema.AdditionalTypes...)
}
return types, nil
}
// GenerateTypesForParameters generates type definitions for any custom types defined in the
// components/parameters section of the Swagger spec.
func GenerateTypesForParameters(t *template.Template, params map[string]*openapi3.ParameterRef) ([]TypeDefinition, error) {
var types []TypeDefinition
for _, paramName := range SortedMapKeys(params) {
paramOrRef := params[paramName]
goType, err := paramToGoType(paramOrRef.Value, nil)
if err != nil {
return nil, fmt.Errorf("error generating Go type for schema in parameter %s: %w", paramName, err)
}
goTypeName, err := renameParameter(paramName, paramOrRef)
if err != nil {
return nil, fmt.Errorf("error making name for components/parameters/%s: %w", paramName, err)
}
if resolved := resolvedNameForComponent("parameters", paramName); resolved != "" {
goTypeName = resolved
}
typeDef := TypeDefinition{
JsonName: paramName,
Schema: goType,
TypeName: goTypeName,
}
if paramOrRef.Ref != "" {
// Generate a reference type for referenced parameters
refType, err := RefPathToGoType(paramOrRef.Ref)
if err != nil {
return nil, fmt.Errorf("error generating Go type for (%s) in parameter %s: %w", paramOrRef.Ref, paramName, err)
}
typeDef.TypeName = SchemaNameToTypeName(refType)
}
types = append(types, typeDef)
}
return types, nil
}
// GenerateTypesForResponses generates type definitions for any custom types defined in the
// components/responses section of the Swagger spec.
func GenerateTypesForResponses(t *template.Template, responses openapi3.ResponseBodies) ([]TypeDefinition, error) {
var types []TypeDefinition
for _, responseName := range SortedMapKeys(responses) {
responseOrRef := responses[responseName]
// We have to generate the response object. We're only going to
// handle media types that conform to JSON. Other responses should
// simply be specified as strings or byte arrays.
response := responseOrRef.Value
jsonCount := 0
for mediaType := range response.Content {
if util.IsMediaTypeJson(mediaType) {
jsonCount++
}
}
SortedMapKeys := SortedMapKeys(response.Content)
for _, mediaType := range SortedMapKeys {
response := response.Content[mediaType]
if !util.IsMediaTypeJson(mediaType) {
continue
}
// When a response has multiple JSON content types, include the
// content type in the schema path so that inline types (e.g.,
// oneOf union members) get unique names per content type.
// See the matching logic in GetResponseTypeDefinitions.
//
// We only add the content type segment when collision resolution
// is enabled (resolve-type-name-collisions) and jsonCount > 1,
// to avoid changing type names for existing users. Ideally the
// media type would always be part of the path for consistency.
// TODO: revisit this at the next major version change —
// always include the media type in the schema path.
schemaPath := []string{responseName}
if jsonCount > 1 && true { // HACK
schemaPath = append(schemaPath, mediaTypeToCamelCase(mediaType))
}
goType, err := GenerateGoSchema(response.Schema, schemaPath)
if err != nil {
return nil, fmt.Errorf("error generating Go type for schema in response %s: %w", responseName, err)
}
goTypeName, err := renameResponse(responseName, responseOrRef)
if err != nil {
return nil, fmt.Errorf("error making name for components/responses/%s: %w", responseName, err)
}
if resolved := resolvedNameForComponent("responses", responseName, mediaType); resolved != "" {
goTypeName = resolved
}
typeDef := TypeDefinition{
JsonName: responseName,
Schema: goType,
TypeName: goTypeName,
}
if responseOrRef.Ref != "" {
// Generate a reference type for referenced parameters
refType, err := RefPathToGoType(responseOrRef.Ref)
if err != nil {
return nil, fmt.Errorf("error generating Go type for (%s) in parameter %s: %w", responseOrRef.Ref, responseName, err)
}
typeDef.TypeName = SchemaNameToTypeName(refType)
}
if jsonCount > 1 {
typeDef.TypeName = typeDef.TypeName + mediaTypeToCamelCase(mediaType)
}
types = append(types, typeDef)
types = append(types, goType.AdditionalTypes...)
}
}
return types, nil
}
// GenerateTypesForRequestBodies generates type definitions for any custom types defined in the
// components/requestBodies section of the Swagger spec.
func GenerateTypesForRequestBodies(t *template.Template, bodies map[string]*openapi3.RequestBodyRef) ([]TypeDefinition, error) {
var types []TypeDefinition
for _, requestBodyName := range SortedMapKeys(bodies) {
requestBodyRef := bodies[requestBodyName]
// As for responses, we will only generate Go code for JSON bodies,
// the other body formats are up to the user.
response := requestBodyRef.Value
for _, mediaType := range SortedMapKeys(response.Content) {
body := response.Content[mediaType]
if !util.IsMediaTypeJson(mediaType) {
continue
}
goType, err := GenerateGoSchema(body.Schema, []string{requestBodyName})
if err != nil {
return nil, fmt.Errorf("error generating Go type for schema in body %s: %w", requestBodyName, err)
}
goTypeName, err := renameRequestBody(requestBodyName, requestBodyRef)
if err != nil {
return nil, fmt.Errorf("error making name for components/schemas/%s: %w", requestBodyName, err)
}
if resolved := resolvedNameForComponent("requestBodies", requestBodyName, mediaType); resolved != "" {
goTypeName = resolved
}
typeDef := TypeDefinition{
JsonName: requestBodyName,
Schema: goType,
TypeName: goTypeName,
}
if requestBodyRef.Ref != "" {
// Generate a reference type for referenced bodies
refType, err := RefPathToGoType(requestBodyRef.Ref)
if err != nil {
return nil, fmt.Errorf("error generating Go type for (%s) in body %s: %w", requestBodyRef.Ref, requestBodyName, err)
}
typeDef.TypeName = SchemaNameToTypeName(refType)
}
types = append(types, typeDef)
types = append(types, goType.AdditionalTypes...)
}
}
return types, nil
}
// GenerateTypes passes a bunch of types to the template engine, and buffers
// its output into a string.
func GenerateTypes(t *template.Template, types []TypeDefinition) (string, error) {
m := map[string]TypeDefinition{}
var ts []TypeDefinition
for _, typ := range types {
if prevType, found := m[typ.TypeName]; found {
// If type names collide, we need to see if they refer to the same
// exact type definition, in which case, we can de-dupe. If they
// don't match, we error out.
if TypeDefinitionsEquivalent(prevType, typ) {
continue
}
return "", fmt.Errorf("duplicate typename '%s' detected, can't auto-rename, "+
"please use x-go-name to specify your own name for one of them", typ.TypeName)
}
m[typ.TypeName] = typ
ts = append(ts, typ)
}
context := struct {
Types []TypeDefinition
}{
Types: ts,
}
return GenerateTemplates([]string{"typedef.tmpl"}, t, context)
}
// resolvedNameForComponent looks up the resolved Go type name for a component
// identified by its section (e.g., "schemas", "parameters") and name.
// For content-bearing sections (responses, requestBodies), an optional
// contentType can be provided to match the exact media type entry.
// Returns empty string if no resolved name is available.
func resolvedNameForComponent(section, name string, contentType ...string) string {
if len(globalState.resolvedNames) == 0 {
return ""
}
// Direct key match for schemas, parameters, headers
key := "components/" + section + "/" + name
if resolved, ok := globalState.resolvedNames[key]; ok {
return resolved
}
// For responses and requestBodies, the path includes content type info.
// If a specific content type was provided, do an exact match.
if len(contentType) > 0 && contentType[0] != "" {
exactKey := key + "/content/" + contentType[0]
if resolved, ok := globalState.resolvedNames[exactKey]; ok {
return resolved
}
}
// Fall back to prefix match for callers that don't specify content type.
// Sort matching keys so the result is deterministic across runs.
prefix := key + "/"
var matches []string
for k := range globalState.resolvedNames {
if strings.HasPrefix(k, prefix) {
matches = append(matches, k)
}
}
if len(matches) > 0 {
if len(matches) > 1 {
sort.Strings(matches)
}
return globalState.resolvedNames[matches[0]]
}
return ""
}
// resolvedNameForRefPath looks up the resolved Go type name for a $ref path
// like "#/components/responses/Foo", optionally scoped to a specific content type.
func resolvedNameForRefPath(refPath, contentType string) string {
if len(globalState.resolvedNames) == 0 || !strings.HasPrefix(refPath, "#/") {
return ""
}
parts := strings.Split(refPath, "/")
if len(parts) != 4 || parts[1] != "components" {
return ""
}
return resolvedNameForComponent(parts[2], parts[3], contentType)
}
func GenerateEnums(t *template.Template, types []TypeDefinition) (string, error) {
enums := []EnumDefinition{}
// Keep track of which enums we've generated
m := map[string]bool{}
// These are all types defined globally
for _, tp := range types {
if found := m[tp.TypeName]; found {
continue
}
m[tp.TypeName] = true
if len(tp.Schema.EnumValues) > 0 {
wrapper := ""
if tp.Schema.GoType == "string" {
wrapper = `"`
}
enums = append(enums, EnumDefinition{
Schema: tp.Schema,
TypeName: tp.TypeName,
ValueWrapper: wrapper,
PrefixTypeName: globalState.options.Compatibility.AlwaysPrefixEnumValues,
})
}
}
// Now, go through all the enums, and figure out if we have conflicts with
// any others.
for i := range enums {
// Look through all other enums not compared so far. Make sure we don't
// compare against self.
e1 := enums[i]
for j := i + 1; j < len(enums); j++ {
e2 := enums[j]
for e1key := range e1.GetValues() {
_, found := e2.GetValues()[e1key]
if found {
e1.PrefixTypeName = true
e2.PrefixTypeName = true
enums[i] = e1
enums[j] = e2
break
}
}
}
// now see if this enum conflicts with any global type names.
for _, tp := range types {
// Skip over enums, since we've handled those above.
if len(tp.Schema.EnumValues) > 0 {
continue
}
_, found := e1.Schema.EnumValues[tp.TypeName]
if found {
e1.PrefixTypeName = true
enums[i] = e1
}
}
// Another edge case is that an enum value can conflict with its own
// type name.
_, found := e1.GetValues()[e1.TypeName]
if found {
e1.PrefixTypeName = true
enums[i] = e1
}
}
// Now see if enums conflict with any non-enum typenames
return GenerateTemplates([]string{"constants.tmpl"}, t, Constants{EnumDefinitions: enums})
}
// GenerateImports generates our import statements and package definition.