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package main import ( "encoding/json" "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-playground/validator/v10" "log" "net/http" ) type SampleRequest struct { Name string `json:"name" validate:"required,min=3"` Age int `json:"age" validate:"required,min=1"` } var validate = validator.New() type ValidationErrors struct { Errors map[string][]string `json:"errors"` } func main() { r := chi.NewRouter() r.Use(middleware.Logger) r.Use(middleware.Recoverer) r.Post("/submit/{name}", func(w http.ResponseWriter, r *http.Request) { sampleReq := &SampleRequest{} // Set the path parameter name := chi.URLParam(r, "name") if name == "" { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "name is required", }) return } sampleReq.Name = name // Parse and decode the JSON body if err := json.NewDecoder(r.Body).Decode(sampleReq); err != nil { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Invalid JSON format", }) return } // Validate the request if err := validate.Struct(sampleReq); err != nil { validationErrors := make(map[string][]string) for _, err := range err.(validator.ValidationErrors) { fieldName := err.Field() validationErrors[fieldName] = append(validationErrors[fieldName], err.Tag()) } w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Validation error", "body": ValidationErrors{Errors: validationErrors}, }) return } // Send success response w.WriteHeader(http.StatusOK) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusOK, "message": "Request received successfully", "body": sampleReq, }) }) log.Println("Starting server on :8080") http.ListenAndServe(":8080", r) }
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package main import ( "encoding/json" "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-playground/validator/v10" "log" "net/http" ) type SampleRequest struct { Name string `json:"name" validate:"required,min=3"` Age int `json:"age" validate:"required,min=1"` } var validate = validator.New() type ValidationErrors struct { Errors map[string][]string `json:"errors"` } func main() { r := chi.NewRouter() r.Use(middleware.Logger) r.Use(middleware.Recoverer) r.Post("/submit/{name}", func(w http.ResponseWriter, r *http.Request) { sampleReq := &SampleRequest{} // Set the path parameter name := chi.URLParam(r, "name") if name == "" { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "name is required", }) return } sampleReq.Name = name // Parse and decode the JSON body if err := json.NewDecoder(r.Body).Decode(sampleReq); err != nil { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Invalid JSON format", }) return } // Validate the request if err := validate.Struct(sampleReq); err != nil { validationErrors := make(map[string][]string) for _, err := range err.(validator.ValidationErrors) { fieldName := err.Field() validationErrors[fieldName] = append(validationErrors[fieldName], err.Tag()) } w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Validation error", "body": ValidationErrors{Errors: validationErrors}, }) return } // Send success response w.WriteHeader(http.StatusOK) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusOK, "message": "Request received successfully", "body": sampleReq, }) }) log.Println("Starting server on :8080") http.ListenAndServe(":8080", r) }
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package httpsuite import ( "encoding/json" "errors" "github.com/go-chi/chi/v5" "net/http" "reflect" ) // RequestParamSetter defines the interface used to set the parameters to the HTTP request object by the request parser. // Implementing this interface allows custom handling of URL parameters. type RequestParamSetter interface { // SetParam assigns a value to a specified field in the request struct. // The fieldName parameter is the name of the field, and value is the value to set. SetParam(fieldName, value string) error } // ParseRequest parses the incoming HTTP request into a specified struct type, handling JSON decoding and URL parameters. // It validates the parsed request and returns it along with any potential errors. // The pathParams variadic argument allows specifying URL parameters to be extracted. // If an error occurs during parsing, validation, or parameter setting, it responds with an appropriate HTTP status. func ParseRequest[T RequestParamSetter](w http.ResponseWriter, r *http.Request, pathParams ...string) (T, error) { var request T var empty T defer func() { _ = r.Body.Close() }() if r.Body != http.NoBody { if err := json.NewDecoder(r.Body).Decode(&request); err != nil { SendResponse[any](w, "Invalid JSON format", http.StatusBadRequest, nil) return empty, err } } // If body wasn't parsed request may be nil and cause problems ahead if isRequestNil(request) { request = reflect.New(reflect.TypeOf(request).Elem()).Interface().(T) } // Parse URL parameters for _, key := range pathParams { value := chi.URLParam(r, key) if value == "" { SendResponse[any](w, "Parameter "+key+" not found in request", http.StatusBadRequest, nil) return empty, errors.New("missing parameter: " + key) } if err := request.SetParam(key, value); err != nil { SendResponse[any](w, "Failed to set field "+key, http.StatusInternalServerError, nil) return empty, err } } // Validate the combined request struct if validationErr := IsRequestValid(request); validationErr != nil { SendResponse[ValidationErrors](w, "Validation error", http.StatusBadRequest, validationErr) return empty, errors.New("validation error") } return request, nil } func isRequestNil(i interface{}) bool { return i == nil || (reflect.ValueOf(i).Kind() == reflect.Ptr && reflect.ValueOf(i).IsNil()) }
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package main import ( "encoding/json" "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/go-playground/validator/v10" "log" "net/http" ) type SampleRequest struct { Name string `json:"name" validate:"required,min=3"` Age int `json:"age" validate:"required,min=1"` } var validate = validator.New() type ValidationErrors struct { Errors map[string][]string `json:"errors"` } func main() { r := chi.NewRouter() r.Use(middleware.Logger) r.Use(middleware.Recoverer) r.Post("/submit/{name}", func(w http.ResponseWriter, r *http.Request) { sampleReq := &SampleRequest{} // Set the path parameter name := chi.URLParam(r, "name") if name == "" { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "name is required", }) return } sampleReq.Name = name // Parse and decode the JSON body if err := json.NewDecoder(r.Body).Decode(sampleReq); err != nil { w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Invalid JSON format", }) return } // Validate the request if err := validate.Struct(sampleReq); err != nil { validationErrors := make(map[string][]string) for _, err := range err.(validator.ValidationErrors) { fieldName := err.Field() validationErrors[fieldName] = append(validationErrors[fieldName], err.Tag()) } w.WriteHeader(http.StatusBadRequest) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusBadRequest, "message": "Validation error", "body": ValidationErrors{Errors: validationErrors}, }) return } // Send success response w.WriteHeader(http.StatusOK) json.NewEncoder(w).Encode(map[string]interface{}{ "code": http.StatusOK, "message": "Request received successfully", "body": sampleReq, }) }) log.Println("Starting server on :8080") http.ListenAndServe(":8080", r) }
?? ??? ??? ?????. httpsuite/validation_test.go:
package httpsuite import ( "encoding/json" "errors" "github.com/go-chi/chi/v5" "net/http" "reflect" ) // RequestParamSetter defines the interface used to set the parameters to the HTTP request object by the request parser. // Implementing this interface allows custom handling of URL parameters. type RequestParamSetter interface { // SetParam assigns a value to a specified field in the request struct. // The fieldName parameter is the name of the field, and value is the value to set. SetParam(fieldName, value string) error } // ParseRequest parses the incoming HTTP request into a specified struct type, handling JSON decoding and URL parameters. // It validates the parsed request and returns it along with any potential errors. // The pathParams variadic argument allows specifying URL parameters to be extracted. // If an error occurs during parsing, validation, or parameter setting, it responds with an appropriate HTTP status. func ParseRequest[T RequestParamSetter](w http.ResponseWriter, r *http.Request, pathParams ...string) (T, error) { var request T var empty T defer func() { _ = r.Body.Close() }() if r.Body != http.NoBody { if err := json.NewDecoder(r.Body).Decode(&request); err != nil { SendResponse[any](w, "Invalid JSON format", http.StatusBadRequest, nil) return empty, err } } // If body wasn't parsed request may be nil and cause problems ahead if isRequestNil(request) { request = reflect.New(reflect.TypeOf(request).Elem()).Interface().(T) } // Parse URL parameters for _, key := range pathParams { value := chi.URLParam(r, key) if value == "" { SendResponse[any](w, "Parameter "+key+" not found in request", http.StatusBadRequest, nil) return empty, errors.New("missing parameter: " + key) } if err := request.SetParam(key, value); err != nil { SendResponse[any](w, "Failed to set field "+key, http.StatusInternalServerError, nil) return empty, err } } // Validate the combined request struct if validationErr := IsRequestValid(request); validationErr != nil { SendResponse[ValidationErrors](w, "Validation error", http.StatusBadRequest, validationErr) return empty, errors.New("validation error") } return request, nil } func isRequestNil(i interface{}) bool { return i == nil || (reflect.ValueOf(i).Kind() == reflect.Ptr && reflect.ValueOf(i).IsNil()) }
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?? ??? httpsuite/response.go:
package httpsuite import ( "bytes" "context" "encoding/json" "errors" "fmt" "github.com/go-chi/chi/v5" "github.com/stretchr/testify/assert" "log" "net/http" "net/http/httptest" "strconv" "strings" "testing" ) // TestRequest includes custom type annotation for UUID type TestRequest struct { ID int `json:"id" validate:"required"` Name string `json:"name" validate:"required"` } func (r *TestRequest) SetParam(fieldName, value string) error { switch strings.ToLower(fieldName) { case "id": id, err := strconv.Atoi(value) if err != nil { return errors.New("invalid id") } r.ID = id default: log.Printf("Parameter %s cannot be set", fieldName) } return nil } func Test_ParseRequest(t *testing.T) { testSetURLParam := func(r *http.Request, fieldName, value string) *http.Request { ctx := chi.NewRouteContext() ctx.URLParams.Add(fieldName, value) return r.WithContext(context.WithValue(r.Context(), chi.RouteCtxKey, ctx)) } type args struct { w http.ResponseWriter r *http.Request pathParams []string } type testCase[T any] struct { name string args args want *TestRequest wantErr assert.ErrorAssertionFunc } tests := []testCase[TestRequest]{ { name: "Successful Request", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { body, _ := json.Marshal(TestRequest{Name: "Test"}) req := httptest.NewRequest("POST", "/test/123", bytes.NewBuffer(body)) req = testSetURLParam(req, "ID", "123") req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: &TestRequest{ID: 123, Name: "Test"}, wantErr: assert.NoError, }, { name: "Missing body", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { req := httptest.NewRequest("POST", "/test/123", nil) req = testSetURLParam(req, "ID", "123") req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: nil, wantErr: assert.Error, }, { name: "Missing Path Parameter", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { req := httptest.NewRequest("POST", "/test", nil) req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: nil, wantErr: assert.Error, }, { name: "Invalid JSON Body", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { req := httptest.NewRequest("POST", "/test/123", bytes.NewBufferString("{invalid-json}")) req = testSetURLParam(req, "ID", "123") req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: nil, wantErr: assert.Error, }, { name: "Validation Error for body", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { body, _ := json.Marshal(TestRequest{}) req := httptest.NewRequest("POST", "/test/123", bytes.NewBuffer(body)) req = testSetURLParam(req, "ID", "123") req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: nil, wantErr: assert.Error, }, { name: "Validation Error for zero ID", args: args{ w: httptest.NewRecorder(), r: func() *http.Request { body, _ := json.Marshal(TestRequest{Name: "Test"}) req := httptest.NewRequest("POST", "/test/0", bytes.NewBuffer(body)) req = testSetURLParam(req, "ID", "0") req.Header.Set("Content-Type", "application/json") return req }(), pathParams: []string{"ID"}, }, want: nil, wantErr: assert.Error, }, } for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { got, err := ParseRequest[*TestRequest](tt.args.w, tt.args.r, tt.args.pathParams...) if !tt.wantErr(t, err, fmt.Sprintf("parseRequest(%v, %v, %v)", tt.args.w, tt.args.r, tt.args.pathParams)) { return } assert.Equalf(t, tt.want, got, "parseRequest(%v, %v, %v)", tt.args.w, tt.args.r, tt.args.pathParams) }) } }
??? ?? ??? httpsuite/response_test.go:
package httpsuite import ( "errors" "github.com/go-playground/validator/v10" ) // ValidationErrors represents a collection of validation errors for an HTTP request. type ValidationErrors struct { Errors map[string][]string `json:"errors,omitempty"` } // NewValidationErrors creates a new ValidationErrors instance from a given error. // It extracts field-specific validation errors and maps them for structured output. func NewValidationErrors(err error) *ValidationErrors { var validationErrors validator.ValidationErrors errors.As(err, &validationErrors) fieldErrors := make(map[string][]string) for _, vErr := range validationErrors { fieldName := vErr.Field() fieldError := fieldName + " " + vErr.Tag() fieldErrors[fieldName] = append(fieldErrors[fieldName], fieldError) } return &ValidationErrors{Errors: fieldErrors} } // IsRequestValid validates the provided request struct using the go-playground/validator package. // It returns a ValidationErrors instance if validation fails, or nil if the request is valid. func IsRequestValid(request any) *ValidationErrors { validate := validator.New(validator.WithRequiredStructEnabled()) err := validate.Struct(request) if err != nil { return NewValidationErrors(err) } return nil }
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package httpsuite import ( "github.com/go-playground/validator/v10" "testing" "github.com/stretchr/testify/assert" ) type TestValidationRequest struct { Name string `validate:"required"` Age int `validate:"required,min=18"` } func TestNewValidationErrors(t *testing.T) { validate := validator.New() request := TestValidationRequest{} // Missing required fields to trigger validation errors err := validate.Struct(request) if err == nil { t.Fatal("Expected validation errors, but got none") } validationErrors := NewValidationErrors(err) expectedErrors := map[string][]string{ "Name": {"Name required"}, "Age": {"Age required"}, } assert.Equal(t, expectedErrors, validationErrors.Errors) } func TestIsRequestValid(t *testing.T) { tests := []struct { name string request TestValidationRequest expectedErrors *ValidationErrors }{ { name: "Valid request", request: TestValidationRequest{Name: "Alice", Age: 25}, expectedErrors: nil, // No errors expected for valid input }, { name: "Missing Name and Age below minimum", request: TestValidationRequest{Age: 17}, expectedErrors: &ValidationErrors{ Errors: map[string][]string{ "Name": {"Name required"}, "Age": {"Age min"}, }, }, }, { name: "Missing Age", request: TestValidationRequest{Name: "Alice"}, expectedErrors: &ValidationErrors{ Errors: map[string][]string{ "Age": {"Age required"}, }, }, }, } for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { errs := IsRequestValid(tt.request) if tt.expectedErrors == nil { assert.Nil(t, errs) } else { assert.NotNil(t, errs) assert.Equal(t, tt.expectedErrors.Errors, errs.Errors) } }) } }
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