Repository: deepmap/oapi-codegen
Pull request #952 (2023-02-06 12:21:35)

Fix pointers equality in TypeDefinitionsEquivalent function
`OAPISchema` is a pointer and using `==` to check the equality of the pointers is always false. The correct way is doing it using `DeepEqual`.

spinillos: @deepmap-marcinr Sorry for the delay updating this PR. Looks like that it doesn't have more conflicts.

Patch:
diff --git a/cmd/oapi-codegen/oapi-codegen.go b/cmd/oapi-codegen/oapi-codegen.go
index 7d9f2cc..ea9e008 100644
--- a/cmd/oapi-codegen/oapi-codegen.go
+++ b/cmd/oapi-codegen/oapi-codegen.go
@@ -53,6 +53,7 @@ var (
 	flagExcludeSchemas     string
 	flagResponseTypeSuffix string
 	flagAliasTypes         bool
+	flagInitalismOverrides bool
 )
 
 type configuration struct {
@@ -98,6 +99,7 @@ func main() {
 	flag.StringVar(&flagExcludeSchemas, "exclude-schemas", "", "A comma separated list of schemas which must be excluded from generation")
 	flag.StringVar(&flagResponseTypeSuffix, "response-type-suffix", "", "the suffix used for responses types")
 	flag.BoolVar(&flagAliasTypes, "alias-types", false, "Alias type declarations of possible")
+	flag.BoolVar(&flagInitalismOverrides, "initialism-overrides", false, "Use initialism overrides")
 
 	flag.Parse()
 
@@ -396,6 +398,8 @@ func updateConfigFromFlags(cfg *configuration) error {
 		cfg.OutputFile = flagOutputFile
 	}
 
+	cfg.OutputOptions.InitialismOverrides = flagInitalismOverrides
+
 	return nil
 }
 
diff --git a/examples/petstore-expanded/strict/api/petstore-server.gen.go b/examples/petstore-expanded/strict/api/petstore-server.gen.go
index cd9352a..822dee7 100644
--- a/examples/petstore-expanded/strict/api/petstore-server.gen.go
+++ b/examples/petstore-expanded/strict/api/petstore-server.gen.go
@@ -408,9 +408,8 @@ type StrictServerInterface interface {
 	FindPetByID(ctx context.Context, request FindPetByIDRequestObject) (FindPetByIDResponseObject, error)
 }
 
-type StrictHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictHttpHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictHttpMiddlewareFunc
 
 type StrictHTTPServerOptions struct {
 	RequestErrorHandlerFunc  func(w http.ResponseWriter, r *http.Request, err error)
diff --git a/go.mod b/go.mod
index 31bc950..240683f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/deepmap/oapi-codegen
 
 require (
 	github.com/apapsch/go-jsonmerge/v2 v2.0.0
-	github.com/getkin/kin-openapi v0.115.0
+	github.com/getkin/kin-openapi v0.116.0
 	github.com/gin-gonic/gin v1.9.0
 	github.com/go-chi/chi/v5 v5.0.8
 	github.com/golangci/lint-1 v0.0.0-20181222135242-d2cdd8c08219
@@ -12,8 +12,8 @@ require (
 	github.com/lestrrat-go/jwx v1.2.25
 	github.com/matryer/moq v0.3.1
 	github.com/stretchr/testify v1.8.2
-	golang.org/x/text v0.8.0
-	golang.org/x/tools v0.7.0
+	golang.org/x/text v0.9.0
+	golang.org/x/tools v0.8.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 
@@ -58,9 +58,9 @@ require (
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	golang.org/x/arch v0.0.0-20210923205945-b76863e36670 // indirect
 	golang.org/x/crypto v0.6.0 // indirect
-	golang.org/x/mod v0.9.0 // indirect
-	golang.org/x/net v0.8.0 // indirect
-	golang.org/x/sys v0.6.0 // indirect
+	golang.org/x/mod v0.10.0 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.7.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f // indirect
 	google.golang.org/protobuf v1.28.1 // indirect
diff --git a/go.sum b/go.sum
index e2d021d..f5edf9d 100644
--- a/go.sum
+++ b/go.sum
@@ -16,8 +16,8 @@ github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0-20210816181553-5444fa50b93d/go.mod h1:tmAIfUFEirG/Y8jhZ9M+h36obRZAk/1fcSpXwAVlfqE=
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 h1:YLtO71vCjJRCBcrPMtQ9nqBsqpA1m5sE92cU+pd5Mcc=
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1/go.mod h1:hyedUtir6IdtD/7lIxGeCxkaw7y45JueMRL4DIyJDKs=
-github.com/getkin/kin-openapi v0.115.0 h1:c8WHRLVY3G8m9jQTy0/DnIuljgRwTCB5twZytQS4JyU=
-github.com/getkin/kin-openapi v0.115.0/go.mod h1:l5e9PaFUo9fyLJCPGQeXI2ML8c3P8BHOEV2VaAVf/pc=
+github.com/getkin/kin-openapi v0.116.0 h1:o986hwgMzR972JzOG5j6+WTwWqllZLs1EJKMKCivs2E=
+github.com/getkin/kin-openapi v0.116.0/go.mod h1:l5e9PaFUo9fyLJCPGQeXI2ML8c3P8BHOEV2VaAVf/pc=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
 github.com/gin-gonic/gin v1.9.0 h1:OjyFBKICoexlu99ctXNR2gg+c5pKrKMuyjgARg9qeY8=
@@ -147,11 +147,11 @@ golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUu
 golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/crypto v0.6.0 h1:qfktjS5LUO+fFKeJXZ+ikTRijMmljikvG68fpMMruSc=
 golang.org/x/crypto v0.6.0/go.mod h1:OFC/31mSvZgRz0V1QTNCzfAI1aIRzbiufJtkMIlEp58=
-golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=
-golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
+golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
-golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
+golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
+golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -160,17 +160,17 @@ golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
-golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4=
 golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=
-golang.org/x/tools v0.7.0/go.mod h1:4pg6aUX35JBAogB10C9AtvVL+qowtN4pT3CGSQex14s=
+golang.org/x/tools v0.8.0 h1:vSDcovVPld282ceKgDimkRSC8kpaH1dgyc9UMzlt84Y=
+golang.org/x/tools v0.8.0/go.mod h1:JxBZ99ISMI5ViVkT1tr6tdNmXeTrcpVSD3vZ1RsRdN4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f h1:GGU+dLjvlC3qDwqYgL6UgRmHXhOOgns0bZu2Ty5mm6U=
 golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/pkg/codegen/codegen.go b/pkg/codegen/codegen.go
index 956d589..70dca56 100644
--- a/pkg/codegen/codegen.go
+++ b/pkg/codegen/codegen.go
@@ -138,7 +138,7 @@ func Generate(spec *openapi3.T, opts Configuration) (string, error) {
 		}
 	}
 
-	ops, err := OperationDefinitions(spec)
+	ops, err := OperationDefinitions(spec, opts.OutputOptions.InitialismOverrides)
 	if err != nil {
 		return "", fmt.Errorf("error creating operation definitions: %w", err)
 	}
diff --git a/pkg/codegen/configuration.go b/pkg/codegen/configuration.go
index afa4fc5..8d7f2e6 100644
--- a/pkg/codegen/configuration.go
+++ b/pkg/codegen/configuration.go
@@ -84,9 +84,10 @@ type OutputOptions struct {
 	ExcludeTags   []string          `yaml:"exclude-tags,omitempty"`   // Exclude operations that have one of these tags. Ignored when empty.
 	UserTemplates map[string]string `yaml:"user-templates,omitempty"` // Override built-in templates from user-provided files
 
-	ExcludeSchemas     []string `yaml:"exclude-schemas,omitempty"`      // Exclude from generation schemas with given names. Ignored when empty.
-	ResponseTypeSuffix string   `yaml:"response-type-suffix,omitempty"` // The suffix used for responses types
-	ClientTypeName     string   `yaml:"client-type-name,omitempty"`     // Override the default generated client type with the value
+	ExcludeSchemas      []string `yaml:"exclude-schemas,omitempty"`      // Exclude from generation schemas with given names. Ignored when empty.
+	ResponseTypeSuffix  string   `yaml:"response-type-suffix,omitempty"` // The suffix used for responses types
+	ClientTypeName      string   `yaml:"client-type-name,omitempty"`     // Override the default generated client type with the value
+	InitialismOverrides bool     `yaml:"initialism-overrides,omitempty"` // Whether to use the initialism overrides
 }
 
 // UpdateDefaults sets reasonable default values for unset fields in Configuration
diff --git a/pkg/codegen/operations.go b/pkg/codegen/operations.go
index 28b991f..fe37328 100644
--- a/pkg/codegen/operations.go
+++ b/pkg/codegen/operations.go
@@ -293,6 +293,10 @@ func (o *OperationDefinition) GetResponseTypeDefinitions() ([]ResponseTypeDefini
 
 					var typeName string
 					switch {
+					// HAL+JSON:
+					case StringInArray(contentTypeName, contentTypesHalJSON):
+						typeName = fmt.Sprintf("HALJSON%s", ToCamelCase(responseName))
+					// JSON:
 					case StringInArray(contentTypeName, contentTypesJSON):
 						typeName = fmt.Sprintf("JSON%s", ToCamelCase(responseName))
 					// YAML:
@@ -483,9 +487,16 @@ func FilterParameterDefinitionByType(params []ParameterDefinition, in string) []
 }
 
 // OperationDefinitions returns all operations for a swagger definition.
-func OperationDefinitions(swagger *openapi3.T) ([]OperationDefinition, error) {
+func OperationDefinitions(swagger *openapi3.T, initialismOverrides bool) ([]OperationDefinition, error) {
 	var operations []OperationDefinition
 
+	var toCamelCaseFunc func(string) string
+	if initialismOverrides {
+		toCamelCaseFunc = ToCamelCaseWithInitialism
+	} else {
+		toCamelCaseFunc = ToCamelCase
+	}
+
 	for _, requestPath := range SortedPathsKeys(swagger.Paths) {
 		pathItem := swagger.Paths[requestPath]
 		// These are parameters defined for all methods on a given path. They
@@ -505,13 +516,13 @@ func OperationDefinitions(swagger *openapi3.T) ([]OperationDefinition, error) {
 			}
 			// We rely on OperationID to generate function names, it's required
 			if op.OperationID == "" {
-				op.OperationID, err = generateDefaultOperationID(opName, requestPath)
+				op.OperationID, err = generateDefaultOperationID(opName, requestPath, toCamelCaseFunc)
 				if err != nil {
 					return nil, fmt.Errorf("error generating default OperationID for %s/%s: %s",
 						opName, requestPath, err)
 				}
 			} else {
-				op.OperationID = ToCamelCase(op.OperationID)
+				op.OperationID = toCamelCaseFunc(op.OperationID)
 			}
 			op.OperationID = typeNamePrefix(op.OperationID) + op.OperationID
 
@@ -550,7 +561,7 @@ func OperationDefinitions(swagger *openapi3.T) ([]OperationDefinition, error) {
 				HeaderParams: FilterParameterDefinitionByType(allParams, "header"),
 				QueryParams:  FilterParameterDefinitionByType(allParams, "query"),
 				CookieParams: FilterParameterDefinitionByType(allParams, "cookie"),
-				OperationId:  ToCamelCase(op.OperationID),
+				OperationId:  toCamelCaseFunc(op.OperationID),
 				// Replace newlines in summary.
 				Summary:         op.Summary,
 				Method:          opName,
@@ -588,7 +599,7 @@ func OperationDefinitions(swagger *openapi3.T) ([]OperationDefinition, error) {
 	return operations, nil
 }
 
-func generateDefaultOperationID(opName string, requestPath string) (string, error) {
+func generateDefaultOperationID(opName string, requestPath string, toCamelCaseFunc func(string) string) (string, error) {
 	var operationId = strings.ToLower(opName)
 
 	if opName == "" {
@@ -605,7 +616,7 @@ func generateDefaultOperationID(opName string, requestPath string) (string, erro
 		}
 	}
 
-	return ToCamelCase(operationId), nil
+	return toCamelCaseFunc(operationId), nil
 }
 
 // GenerateBodyDefinitions turns the Swagger body definitions into a list of our body
diff --git a/pkg/codegen/schema.go b/pkg/codegen/schema.go
index 457e102..e9fccbf 100644
--- a/pkg/codegen/schema.go
+++ b/pkg/codegen/schema.go
@@ -638,17 +638,20 @@ func GenFieldsFromProperties(props []Property) []string {
 
 		field += fmt.Sprintf("    %s %s", goFieldName, p.GoTypeDef())
 
+		omitEmpty := !p.Nullable &&
+			(!p.Required || p.ReadOnly || p.WriteOnly) &&
+			(!p.Required || !p.ReadOnly || !globalState.options.Compatibility.DisableRequiredReadOnlyAsPointer)
+
 		// Support x-omitempty
-		overrideOmitEmpty := true
-		if _, ok := p.Extensions[extPropOmitEmpty]; ok {
-			if extOmitEmpty, err := extParseOmitEmpty(p.Extensions[extPropOmitEmpty]); err == nil {
-				overrideOmitEmpty = extOmitEmpty
+		if extOmitEmptyValue, ok := p.Extensions[extPropOmitEmpty]; ok {
+			if extOmitEmpty, err := extParseOmitEmpty(extOmitEmptyValue); err == nil {
+				omitEmpty = extOmitEmpty
 			}
 		}
 
 		fieldTags := make(map[string]string)
 
-		if (p.Required && !p.ReadOnly && !p.WriteOnly) || p.Nullable || !overrideOmitEmpty || (p.Required && p.ReadOnly && globalState.options.Compatibility.DisableRequiredReadOnlyAsPointer) {
+		if !omitEmpty {
 			fieldTags["json"] = p.JsonFieldName
 			if p.NeedsFormTag {
 				fieldTags["form"] = p.JsonFieldName
diff --git a/pkg/codegen/template_helpers.go b/pkg/codegen/template_helpers.go
index 16671fb..bae1e30 100644
--- a/pkg/codegen/template_helpers.go
+++ b/pkg/codegen/template_helpers.go
@@ -34,9 +34,10 @@ const (
 )
 
 var (
-	contentTypesJSON = []string{echo.MIMEApplicationJSON, "text/x-json", "application/problem+json"}
-	contentTypesYAML = []string{"application/yaml", "application/x-yaml", "text/yaml", "text/x-yaml"}
-	contentTypesXML  = []string{echo.MIMEApplicationXML, echo.MIMETextXML, "application/problems+xml"}
+	contentTypesJSON    = []string{echo.MIMEApplicationJSON, "text/x-json", "application/problem+json"}
+	contentTypesHalJSON = []string{"application/hal+json"}
+	contentTypesYAML    = []string{"application/yaml", "application/x-yaml", "text/yaml", "text/x-yaml"}
+	contentTypesXML     = []string{echo.MIMEApplicationXML, echo.MIMETextXML, "application/problems+xml"}
 
 	responseTypeSuffix = "Response"
 
diff --git a/pkg/codegen/templates/strict/strict-echo.tmpl b/pkg/codegen/templates/strict/strict-echo.tmpl
index 4bd6aec..86def37 100644
--- a/pkg/codegen/templates/strict/strict-echo.tmpl
+++ b/pkg/codegen/templates/strict/strict-echo.tmpl
@@ -1,6 +1,5 @@
-type StrictHandlerFunc func(ctx echo.Context, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictEchoHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictEchoMiddlewareFunc
 
 func NewStrictHandler(ssi StrictServerInterface, middlewares []StrictMiddlewareFunc) ServerInterface {
     return &strictHandler{ssi: ssi, middlewares: middlewares}
diff --git a/pkg/codegen/templates/strict/strict-gin.tmpl b/pkg/codegen/templates/strict/strict-gin.tmpl
index 9622fb2..23d8f0b 100644
--- a/pkg/codegen/templates/strict/strict-gin.tmpl
+++ b/pkg/codegen/templates/strict/strict-gin.tmpl
@@ -1,6 +1,5 @@
-type StrictHandlerFunc func(ctx *gin.Context, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictGinHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictGinMiddlewareFunc
 
 func NewStrictHandler(ssi StrictServerInterface, middlewares []StrictMiddlewareFunc) ServerInterface {
     return &strictHandler{ssi: ssi, middlewares: middlewares}
diff --git a/pkg/codegen/templates/strict/strict-http.tmpl b/pkg/codegen/templates/strict/strict-http.tmpl
index d04503d..b16ed1d 100644
--- a/pkg/codegen/templates/strict/strict-http.tmpl
+++ b/pkg/codegen/templates/strict/strict-http.tmpl
@@ -1,6 +1,5 @@
-type StrictHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictHttpHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictHttpMiddlewareFunc
 
 type StrictHTTPServerOptions struct {
     RequestErrorHandlerFunc  func(w http.ResponseWriter, r *http.Request, err error)
diff --git a/pkg/codegen/utils.go b/pkg/codegen/utils.go
index c386cd3..3922538 100644
--- a/pkg/codegen/utils.go
+++ b/pkg/codegen/utils.go
@@ -17,6 +17,7 @@ import (
 	"fmt"
 	"go/token"
 	"net/url"
+	"reflect"
 	"regexp"
 	"sort"
 	"strconv"
@@ -160,6 +161,24 @@ func ToCamelCase(str string) string {
 	return n
 }
 
+func ToCamelCaseWithInitialism(str string) string {
+	return replaceInitialism(ToCamelCase(str))
+}
+
+func replaceInitialism(s string) string {
+	// These strings do not apply CamelCase
+	// Do not do CamelCase when these characters match when the preceding character is lowercase
+	// ["Acl", "Api", "Ascii", "Cpu", "Css", "Dns", "Eof", "Guid", "Html", "Http", "Https", "Id", "Ip", "Json", "Qps", "Ram", "Rpc", "Sla", "Smtp", "Sql", "Ssh", "Tcp", "Tls", "Ttl", "Udp", "Ui", "Gid", "Uid", "Uuid", "Uri", "Url", "Utf8", "Vm", "Xml", "Xmpp", "Xsrf", "Xss", "Sip", "Rtp", "Amqp", "Db", "Ts"]
+	targetWordRegex := regexp.MustCompile(`(?i)(Acl|Api|Ascii|Cpu|Css|Dns|Eof|Guid|Html|Http|Https|Id|Ip|Json|Qps|Ram|Rpc|Sla|Smtp|Sql|Ssh|Tcp|Tls|Ttl|Udp|Ui|Gid|Uid|Uuid|Uri|Url|Utf8|Vm|Xml|Xmpp|Xsrf|Xss|Sip|Rtp|Amqp|Db|Ts)`)
+	return targetWordRegex.ReplaceAllStringFunc(s, func(s string) string {
+		// If the preceding character is lowercase, do not do CamelCase
+		if unicode.IsLower(rune(s[0])) {
+			return s
+		}
+		return strings.ToUpper(s)
+	})
+}
+
 // SortedSchemaKeys returns the keys of the given SchemaRef dictionary in sorted
 // order, since Golang scrambles dictionary keys
 func SortedSchemaKeys(dict map[string]*openapi3.SchemaRef) []string {
@@ -904,5 +923,5 @@ func TypeDefinitionsEquivalent(t1, t2 TypeDefinition) bool {
 	if t1.TypeName != t2.TypeName {
 		return false
 	}
-	return t1.Schema.OAPISchema == t2.Schema.OAPISchema
+	return reflect.DeepEqual(t1.Schema.OAPISchema, t2.Schema.OAPISchema)
 }
diff --git a/pkg/runtime/strictmiddleware.go b/pkg/runtime/strictmiddleware.go
new file mode 100644
index 0000000..fac240e
--- /dev/null
+++ b/pkg/runtime/strictmiddleware.go
@@ -0,0 +1,21 @@
+package runtime
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/labstack/echo/v4"
+)
+
+type StrictEchoHandlerFunc func(ctx echo.Context, request interface{}) (response interface{}, err error)
+
+type StrictEchoMiddlewareFunc func(f StrictEchoHandlerFunc, operationID string) StrictEchoHandlerFunc
+
+type StrictHttpHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, request interface{}) (response interface{}, err error)
+
+type StrictHttpMiddlewareFunc func(f StrictHttpHandlerFunc, operationID string) StrictHttpHandlerFunc
+
+type StrictGinHandlerFunc func(ctx *gin.Context, request interface{}) (response interface{}, err error)
+
+type StrictGinMiddlewareFunc func(f StrictGinHandlerFunc, operationID string) StrictGinHandlerFunc


Test patch:
diff --git a/internal/test/issues/issue-removed-external-ref/gen/spec_base/issue.gen.go b/internal/test/issues/issue-removed-external-ref/gen/spec_base/issue.gen.go
index 09e8df3..69766e1 100644
--- a/internal/test/issues/issue-removed-external-ref/gen/spec_base/issue.gen.go
+++ b/internal/test/issues/issue-removed-external-ref/gen/spec_base/issue.gen.go
@@ -10,6 +10,7 @@ import (
 	"net/http"
 
 	externalRef0 "github.com/deepmap/oapi-codegen/internal/test/issues/issue-removed-external-ref/gen/spec_ext"
+	"github.com/deepmap/oapi-codegen/pkg/runtime"
 	"github.com/go-chi/chi/v5"
 )
 
@@ -244,9 +245,8 @@ type StrictServerInterface interface {
 	PostNoTrouble(ctx context.Context, request PostNoTroubleRequestObject) (PostNoTroubleResponseObject, error)
 }
 
-type StrictHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictHttpHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictHttpMiddlewareFunc
 
 type StrictHTTPServerOptions struct {
 	RequestErrorHandlerFunc  func(w http.ResponseWriter, r *http.Request, err error)
diff --git a/internal/test/issues/issue-removed-external-ref/gen/spec_ext/issue.gen.go b/internal/test/issues/issue-removed-external-ref/gen/spec_ext/issue.gen.go
index 21222f8..ed5a474 100644
--- a/internal/test/issues/issue-removed-external-ref/gen/spec_ext/issue.gen.go
+++ b/internal/test/issues/issue-removed-external-ref/gen/spec_ext/issue.gen.go
@@ -4,10 +4,10 @@
 package spec_ext
 
 import (
-	"context"
 	"fmt"
 	"net/http"
 
+	"github.com/deepmap/oapi-codegen/pkg/runtime"
 	"github.com/go-chi/chi/v5"
 )
 
@@ -161,9 +161,8 @@ type PascalJSONResponse PascalSchema
 type StrictServerInterface interface {
 }
 
-type StrictHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictHttpHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictHttpMiddlewareFunc
 
 type StrictHTTPServerOptions struct {
 	RequestErrorHandlerFunc  func(w http.ResponseWriter, r *http.Request, err error)
diff --git a/internal/test/strict-server/chi/server.gen.go b/internal/test/strict-server/chi/server.gen.go
index 236277c..b3904b5 100644
--- a/internal/test/strict-server/chi/server.gen.go
+++ b/internal/test/strict-server/chi/server.gen.go
@@ -892,9 +892,8 @@ type StrictServerInterface interface {
 	HeadersExample(ctx context.Context, request HeadersExampleRequestObject) (HeadersExampleResponseObject, error)
 }
 
-type StrictHandlerFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictHttpHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictHttpMiddlewareFunc
 
 type StrictHTTPServerOptions struct {
 	RequestErrorHandlerFunc  func(w http.ResponseWriter, r *http.Request, err error)
diff --git a/internal/test/strict-server/echo/server.gen.go b/internal/test/strict-server/echo/server.gen.go
index ebd374b..0912230 100644
--- a/internal/test/strict-server/echo/server.gen.go
+++ b/internal/test/strict-server/echo/server.gen.go
@@ -706,9 +706,8 @@ type StrictServerInterface interface {
 	HeadersExample(ctx context.Context, request HeadersExampleRequestObject) (HeadersExampleResponseObject, error)
 }
 
-type StrictHandlerFunc func(ctx echo.Context, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictEchoHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictEchoMiddlewareFunc
 
 func NewStrictHandler(ssi StrictServerInterface, middlewares []StrictMiddlewareFunc) ServerInterface {
 	return &strictHandler{ssi: ssi, middlewares: middlewares}
diff --git a/internal/test/strict-server/gin/server.gen.go b/internal/test/strict-server/gin/server.gen.go
index 618db70..78b68e5 100644
--- a/internal/test/strict-server/gin/server.gen.go
+++ b/internal/test/strict-server/gin/server.gen.go
@@ -763,9 +763,8 @@ type StrictServerInterface interface {
 	HeadersExample(ctx context.Context, request HeadersExampleRequestObject) (HeadersExampleResponseObject, error)
 }
 
-type StrictHandlerFunc func(ctx *gin.Context, args interface{}) (interface{}, error)
-
-type StrictMiddlewareFunc func(f StrictHandlerFunc, operationID string) StrictHandlerFunc
+type StrictHandlerFunc = runtime.StrictGinHandlerFunc
+type StrictMiddlewareFunc = runtime.StrictGinMiddlewareFunc
 
 func NewStrictHandler(ssi StrictServerInterface, middlewares []StrictMiddlewareFunc) ServerInterface {
 	return &strictHandler{ssi: ssi, middlewares: middlewares}
diff --git a/pkg/codegen/operations_test.go b/pkg/codegen/operations_test.go
index 0eff03e..77a54a8 100644
--- a/pkg/codegen/operations_test.go
+++ b/pkg/codegen/operations_test.go
@@ -131,7 +131,7 @@ func TestGenerateDefaultOperationID(t *testing.T) {
 	}
 
 	for _, test := range suite {
-		got, err := generateDefaultOperationID(test.op, test.path)
+		got, err := generateDefaultOperationID(test.op, test.path, ToCamelCase)
 		if err != nil {
 			if !test.wantErr {
 				t.Fatalf("did not expected error but got %v", err)
diff --git a/pkg/codegen/utils_test.go b/pkg/codegen/utils_test.go
index 32708f0..644167a 100644
--- a/pkg/codegen/utils_test.go
+++ b/pkg/codegen/utils_test.go
@@ -433,6 +433,18 @@ func TestSchemaNameToTypeName(t *testing.T) {
 	}
 }
 
+
+func TestTypeDefinitionsEquivalent(t *testing.T) {
+	def1 := TypeDefinition{TypeName: "name", Schema: Schema{
+		OAPISchema: &openapi3.Schema{},
+	}}
+	def2 := TypeDefinition{TypeName: "name", Schema: Schema{
+		OAPISchema: &openapi3.Schema{},
+	}}
+	assert.True(t, TypeDefinitionsEquivalent(def1, def2))
+}
+
+
 func TestRefPathToObjName(t *testing.T) {
 	t.Parallel()
 
@@ -446,3 +458,45 @@ func TestRefPathToObjName(t *testing.T) {
 		assert.Equal(t, want, RefPathToObjName(in))
 	}
 }
+
+func Test_replaceInitialisms(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "empty string",
+			args: args{s: ""},
+			want: "",
+		},
+		{
+			name: "no initialism",
+			args: args{s: "foo"},
+			want: "foo",
+		},
+		{
+			name: "one initialism",
+			args: args{s: "fooId"},
+			want: "fooID",
+		},
+		{
+			name: "two initialism",
+			args: args{s: "fooIdBarApi"},
+			want: "fooIDBarAPI",
+		},
+		{
+			name: "already initialism",
+			args: args{s: "fooIDBarAPI"},
+			want: "fooIDBarAPI",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equalf(t, tt.want, replaceInitialism(tt.args.s), "replaceInitialism(%v)", tt.args.s)
+		})
+	}
+}