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go-server.routers.mustache Maven / Gradle / Ivy
{{>partial_header}}
package {{packageName}}
import (
"encoding/json"
"errors"
"time"
{{#routers}}
{{#mux}}
"github.com/gorilla/mux"
{{#featureCORS}}
"github.com/gorilla/handlers"
{{/featureCORS}}
{{/mux}}
{{#chi}}
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
{{#featureCORS}}
"github.com/go-chi/cors"
{{/featureCORS}}
{{/chi}}
{{/routers}}
"io"
"mime/multipart"
"net/http"
"os"
"strconv"
"strings"
)
// A Route defines the parameters for an api endpoint
type Route struct {
Method string
Pattern string
HandlerFunc http.HandlerFunc
}
// Routes is a map of defined api endpoints
type Routes map[string]Route
// Router defines the required methods for retrieving api routes
type Router interface {
Routes() Routes
}
const errMsgRequiredMissing = "required parameter is missing"
const errMsgMinValueConstraint = "provided parameter is not respecting minimum value constraint"
const errMsgMaxValueConstraint = "provided parameter is not respecting maximum value constraint"
// NewRouter creates a new router for any number of api routers
func NewRouter(routers ...Router) {{#routers}}{{#mux}}*mux.Router{{/mux}}{{#chi}}chi.Router{{/chi}}{{/routers}} {
{{#routers}}
{{#mux}}
router := mux.NewRouter().StrictSlash(true)
{{/mux}}
{{#chi}}
router := chi.NewRouter()
router.Use(middleware.Logger)
{{#featureCORS}}
router.Use(cors.Handler(cors.Options{}))
{{/featureCORS}}
{{/chi}}
{{/routers}}
for _, api := range routers {
for {{#routers}}{{#mux}}name{{/mux}}{{#chi}}_{{/chi}}{{/routers}}, route := range api.Routes() {
var handler http.Handler
handler = route.HandlerFunc
{{#routers}}
{{#mux}}
handler = Logger(handler, name)
{{#featureCORS}}
handler = handlers.CORS()(handler)
{{/featureCORS}}
router.
Methods(route.Method).
Path(route.Pattern).
Name(name).
Handler(handler)
{{/mux}}
{{#chi}}
router.Method(route.Method, route.Pattern, handler)
{{/chi}}
{{/routers}}
}
}
return router
}
// EncodeJSONResponse uses the json encoder to write an interface to the http response with an optional status code
func EncodeJSONResponse(i interface{}, status *int,{{#addResponseHeaders}} headers map[string][]string,{{/addResponseHeaders}} w http.ResponseWriter) error {
wHeader := w.Header()
{{#addResponseHeaders}}
for key, values := range headers {
for _, value := range values {
wHeader.Add(key, value)
}
}
{{/addResponseHeaders}}
f, ok := i.(*os.File)
if ok {
data, err := io.ReadAll(f)
if err != nil {
return err
}
wHeader.Set("Content-Type", http.DetectContentType(data))
wHeader.Set("Content-Disposition", "attachment; filename="+f.Name())
if status != nil {
w.WriteHeader(*status)
} else {
w.WriteHeader(http.StatusOK)
}
_, err = w.Write(data)
return err
}
wHeader.Set("Content-Type", "application/json; charset=UTF-8")
if status != nil {
w.WriteHeader(*status)
} else {
w.WriteHeader(http.StatusOK)
}
if i != nil {
return json.NewEncoder(w).Encode(i)
}
return nil
}
// ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
func ReadFormFileToTempFile(r *http.Request, key string) (*os.File, error) {
_, fileHeader, err := r.FormFile(key)
if err != nil {
return nil, err
}
return readFileHeaderToTempFile(fileHeader)
}
// ReadFormFilesToTempFiles reads files array data from a request form and writes it to a temporary files
func ReadFormFilesToTempFiles(r *http.Request, key string) ([]*os.File, error) {
if err := r.ParseMultipartForm(32 << 20); err != nil {
return nil, err
}
files := make([]*os.File, 0, len(r.MultipartForm.File[key]))
for _, fileHeader := range r.MultipartForm.File[key] {
file, err := readFileHeaderToTempFile(fileHeader)
if err != nil {
return nil, err
}
files = append(files, file)
}
return files, nil
}
// readFileHeaderToTempFile reads multipart.FileHeader and writes it to a temporary file
func readFileHeaderToTempFile(fileHeader *multipart.FileHeader) (*os.File, error) {
formFile, err := fileHeader.Open()
if err != nil {
return nil, err
}
defer formFile.Close()
file, err := os.CreateTemp("", fileHeader.Filename)
if err != nil {
return nil, err
}
defer file.Close()
_, err = io.Copy(file, formFile)
if err != nil {
return nil, err
}
return file, nil
}
func parseTimes(param string) ([]time.Time, error) {
splits := strings.Split(param, ",")
times := make([]time.Time, 0, len(splits))
for _, v := range splits {
t, err := parseTime(v)
if err != nil {
return nil, err
}
times = append(times, t)
}
return times, nil
}
// parseTime will parses a string parameter into a time.Time using the RFC3339 format
func parseTime(param string) (time.Time, error) {
if param == "" {
return time.Time{}, nil
}
return time.Parse(time.RFC3339, param)
}
type Number interface {
~int32 | ~int64 | ~float32 | ~float64
}
type ParseString[T Number | string | bool] func(v string) (T, error)
// parseFloat64 parses a string parameter to an float64.
func parseFloat64(param string) (float64, error) {
if param == "" {
return 0, nil
}
return strconv.ParseFloat(param, 64)
}
// parseFloat32 parses a string parameter to an float32.
func parseFloat32(param string) (float32, error) {
if param == "" {
return 0, nil
}
v, err := strconv.ParseFloat(param, 32)
return float32(v), err
}
// parseInt64 parses a string parameter to an int64.
func parseInt64(param string) (int64, error) {
if param == "" {
return 0, nil
}
return strconv.ParseInt(param, 10, 64)
}
// parseInt32 parses a string parameter to an int32.
func parseInt32(param string) (int32, error) {
if param == "" {
return 0, nil
}
val, err := strconv.ParseInt(param, 10, 32)
return int32(val), err
}
// parseBool parses a string parameter to an bool.
func parseBool(param string) (bool, error) {
if param == "" {
return false, nil
}
return strconv.ParseBool(param)
}
type Operation[T Number | string | bool] func(actual string) (T, bool, error)
func WithRequire[T Number | string | bool](parse ParseString[T]) Operation[T] {
var empty T
return func(actual string) (T, bool, error) {
if actual == "" {
return empty, false, errors.New(errMsgRequiredMissing)
}
v, err := parse(actual)
return v, false, err
}
}
func WithDefaultOrParse[T Number | string | bool](def T, parse ParseString[T]) Operation[T] {
return func(actual string) (T, bool, error) {
if actual == "" {
return def, true, nil
}
v, err := parse(actual)
return v, false, err
}
}
func WithParse[T Number | string | bool](parse ParseString[T]) Operation[T] {
return func(actual string) (T, bool, error) {
v, err := parse(actual)
return v, false, err
}
}
type Constraint[T Number | string | bool] func(actual T) error
func WithMinimum[T Number](expected T) Constraint[T] {
return func(actual T) error {
if actual < expected {
return errors.New(errMsgMinValueConstraint)
}
return nil
}
}
func WithMaximum[T Number](expected T) Constraint[T] {
return func(actual T) error {
if actual > expected {
return errors.New(errMsgMaxValueConstraint)
}
return nil
}
}
// parseNumericParameter parses a numeric parameter to its respective type.
func parseNumericParameter[T Number](param string, fn Operation[T], checks ...Constraint[T]) (T, error) {
v, ok, err := fn(param)
if err != nil {
return 0, err
}
if !ok {
for _, check := range checks {
if err := check(v); err != nil {
return 0, err
}
}
}
return v, nil
}
// parseBoolParameter parses a string parameter to a bool
func parseBoolParameter(param string, fn Operation[bool]) (bool, error) {
v, _, err := fn(param)
return v, err
}
// parseNumericArrayParameter parses a string parameter containing array of values to its respective type.
func parseNumericArrayParameter[T Number](param, delim string, required bool, fn Operation[T], checks ...Constraint[T]) ([]T, error) {
if param == "" {
if required {
return nil, errors.New(errMsgRequiredMissing)
}
return nil, nil
}
str := strings.Split(param, delim)
values := make([]T, len(str))
for i, s := range str {
v, ok, err := fn(s)
if err != nil {
return nil, err
}
if !ok {
for _, check := range checks {
if err := check(v); err != nil {
return nil, err
}
}
}
values[i] = v
}
return values, nil
}
