alpha: v0.0.1

.gitignore

@@ -0,0 +1,3 @@
+.idea
+.vscode
+.DS_Store

app.go

@@ -0,0 +1,44 @@
+package nf
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+type App struct {
+	*RouterGroup
+	config *Config
+	router *router
+	groups []*RouterGroup
+}
+
+func (a *App) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	c := newContext(a, writer, request)
+
+	for _, group := range a.groups {
+		if strings.HasPrefix(request.URL.Path, group.prefix) {
+			c.handlers = append(c.handlers, group.middlewares...)
+		}
+	}
+
+	if err := a.router.handle(c); err != nil {
+		var ne = &Err{}
+
+		if errors.As(err, ne) {
+			writer.WriteHeader(ne.Status)
+		} else {
+			writer.WriteHeader(500)
+		}
+
+		_, _ = writer.Write([]byte(err.Error()))
+	}
+}
+
+func (a *App) Run(address string) error {
+	if !a.config.DisableBanner {
+		fmt.Println(banner + "nf serve at: " + address + "\n")
+	}
+	return http.ListenAndServe(address, a)
+}

ctx.go

@@ -0,0 +1,156 @@
+package nf
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+)
+
+type Ctx struct {
+	// origin objects
+	Writer  http.ResponseWriter
+	Request *http.Request
+	// request info
+	path   string
+	Method string
+	// response info
+	StatusCode int
+
+	app      *App
+	params   map[string]string
+	index    int
+	handlers []HandlerFunc
+	locals   map[string]any
+}
+
+func newContext(app *App, writer http.ResponseWriter, request *http.Request) *Ctx {
+	return &Ctx{
+		Writer:  writer,
+		Request: request,
+		path:    request.URL.Path,
+		Method:  request.Method,
+
+		app:      app,
+		index:    -1,
+		locals:   map[string]any{},
+		handlers: make([]HandlerFunc, 0),
+	}
+}
+
+func (c *Ctx) Locals(key string, value ...any) any {
+	data := c.locals[key]
+	if len(value) > 0 {
+		c.locals[key] = value[0]
+	}
+
+	return data
+}
+
+func (c *Ctx) Path(overWrite ...string) string {
+	path := c.Request.URL.Path
+	if len(overWrite) > 0 && overWrite[0] != "" {
+		c.Request.URL.Path = overWrite[0]
+	}
+
+	return path
+}
+
+func (c *Ctx) Next() error {
+	c.index++
+	s := len(c.handlers)
+	for ; c.index < s; c.index++ {
+		if err := c.handlers[c.index](c); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+/* ===============================================================
+|| Handle Ctx Request Part
+=============================================================== */
+
+func (c *Ctx) verify() error {
+	// 验证 body size
+	if c.app.config.BodyLimit != -1 && c.Request.ContentLength > c.app.config.BodyLimit {
+		return NewNFError(413, "Content Too Large")
+	}
+
+	return nil
+}
+
+func (c *Ctx) Param(key string) string {
+	return c.params[key]
+}
+
+func (c *Ctx) Form(key string) string {
+	return c.Request.FormValue(key)
+}
+
+func (c *Ctx) Query(key string) string {
+	return c.Request.URL.Query().Get(key)
+}
+
+func (c *Ctx) Get(key string, defaultValue ...string) string {
+	value := c.Request.Header.Get(key)
+	if value == "" && len(defaultValue) > 0 {
+		return defaultValue[0]
+	}
+
+	return value
+}
+
+func (c *Ctx) BodyParser(out interface{}) error {
+	var (
+		err   error
+		ctype = strings.ToLower(c.Request.Header.Get("Content-Type"))
+	)
+
+	log.Printf("BodyParser: Content-Type=%s", ctype)
+
+	ctype = parseVendorSpecificContentType(ctype)
+
+	ctypeEnd := strings.IndexByte(ctype, ';')
+	if ctypeEnd != -1 {
+		ctype = ctype[:ctypeEnd]
+	}
+
+	if strings.HasSuffix(ctype, "json") {
+		bs, err := io.ReadAll(c.Request.Body)
+		if err != nil {
+			log.Printf("BodyParser: read all err=%v", err)
+			return err
+		}
+
+		c.Request.Body = io.NopCloser(bytes.NewReader(bs))
+
+		return json.Unmarshal(bs, out)
+	}
+
+	if strings.HasPrefix(ctype, MIMEApplicationForm) {
+
+		if err = c.Request.ParseForm(); err != nil {
+			return NewNFError(400, err.Error())
+		}
+
+		return parseToStruct("form", out, c.Request.Form)
+	}
+
+	if strings.HasPrefix(ctype, MIMEMultipartForm) {
+		if err = c.Request.ParseMultipartForm(c.app.config.BodyLimit); err != nil {
+			return NewNFError(400, err.Error())
+		}
+
+		return parseToStruct("form", out, c.Request.PostForm)
+	}
+
+	return NewNFError(422, "Unprocessable Content")
+}
+
+func (c *Ctx) QueryParser(out interface{}) error {
+	return parseToStruct("query", out, c.Request.URL.Query())
+}

error.go

@@ -0,0 +1,16 @@
+package nf
+
+import "strconv"
+
+type Err struct {
+	Status int
+	Msg    string
+}
+
+func (n Err) Error() string {
+	return strconv.Itoa(n.Status) + " " + n.Msg
+}
+
+func NewNFError(status int, msg string) Err {
+	return Err{Status: status, Msg: msg}
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/loveuer/nf
+
+go 1.20

group.go

@@ -0,0 +1,61 @@
+package nf
+
+import (
+	"log"
+	"net/http"
+)
+
+type RouterGroup struct {
+	prefix      string
+	middlewares []HandlerFunc // support middleware
+	parent      *RouterGroup  // support nesting
+	app         *App          // all groups share a Engine instance
+}
+
+// Group is defined to create a new RouterGroup
+// remember all groups share the same Engine instance
+func (group *RouterGroup) Group(prefix string) *RouterGroup {
+	app := group.app
+	newGroup := &RouterGroup{
+		prefix: group.prefix + prefix,
+		parent: group,
+		app:    app,
+	}
+	app.groups = append(app.groups, newGroup)
+	return newGroup
+}
+
+func (group *RouterGroup) addRoute(method string, comp string, handlers ...HandlerFunc) {
+	verifyHandlers(comp, handlers...)
+	pattern := group.prefix + comp
+	log.Printf("Add Route %4s - %s", method, pattern)
+	group.app.router.addRoute(method, pattern, handlers...)
+}
+
+func (group *RouterGroup) Get(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodGet, pattern, handlers...)
+}
+
+func (group *RouterGroup) Post(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodPost, pattern, handlers...)
+}
+
+func (group *RouterGroup) Put(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodPut, pattern, handlers...)
+}
+
+func (group *RouterGroup) Delete(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodDelete, pattern, handlers...)
+}
+
+func (group *RouterGroup) Patch(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodPatch, pattern, handlers...)
+}
+
+func (group *RouterGroup) Head(pattern string, handlers ...HandlerFunc) {
+	group.addRoute(http.MethodHead, pattern, handlers...)
+}
+
+func (group *RouterGroup) Use(middlewares ...HandlerFunc) {
+	group.middlewares = append(group.middlewares, middlewares...)
+}

handler.go

@@ -0,0 +1,3 @@
+package nf
+
+type HandlerFunc func(*Ctx) error

internal/schema/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+	 * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+	 * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+	 * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

internal/schema/cache.go

@@ -0,0 +1,305 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package schema
+
+import (
+	"errors"
+	"reflect"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+var errInvalidPath = errors.New("schema: invalid path")
+
+// newCache returns a new cache.
+func newCache() *cache {
+	c := cache{
+		m:       make(map[reflect.Type]*structInfo),
+		regconv: make(map[reflect.Type]Converter),
+		tag:     "schema",
+	}
+	return &c
+}
+
+// cache caches meta-data about a struct.
+type cache struct {
+	l       sync.RWMutex
+	m       map[reflect.Type]*structInfo
+	regconv map[reflect.Type]Converter
+	tag     string
+}
+
+// registerConverter registers a converter function for a custom type.
+func (c *cache) registerConverter(value interface{}, converterFunc Converter) {
+	c.regconv[reflect.TypeOf(value)] = converterFunc
+}
+
+// parsePath parses a path in dotted notation verifying that it is a valid
+// path to a struct field.
+//
+// It returns "path parts" which contain indices to fields to be used by
+// reflect.Value.FieldByString(). Multiple parts are required for slices of
+// structs.
+func (c *cache) parsePath(p string, t reflect.Type) ([]pathPart, error) {
+	var struc *structInfo
+	var field *fieldInfo
+	var index64 int64
+	var err error
+	parts := make([]pathPart, 0)
+	path := make([]string, 0)
+	keys := strings.Split(p, ".")
+	for i := 0; i < len(keys); i++ {
+		if t.Kind() != reflect.Struct {
+			return nil, errInvalidPath
+		}
+		if struc = c.get(t); struc == nil {
+			return nil, errInvalidPath
+		}
+		if field = struc.get(keys[i]); field == nil {
+			return nil, errInvalidPath
+		}
+		// Valid field. Append index.
+		path = append(path, field.name)
+		if field.isSliceOfStructs && (!field.unmarshalerInfo.IsValid || (field.unmarshalerInfo.IsValid && field.unmarshalerInfo.IsSliceElement)) {
+			// Parse a special case: slices of structs.
+			// i+1 must be the slice index.
+			//
+			// Now that struct can implements TextUnmarshaler interface,
+			// we don't need to force the struct's fields to appear in the path.
+			// So checking i+2 is not necessary anymore.
+			i++
+			if i+1 > len(keys) {
+				return nil, errInvalidPath
+			}
+			if index64, err = strconv.ParseInt(keys[i], 10, 0); err != nil {
+				return nil, errInvalidPath
+			}
+			parts = append(parts, pathPart{
+				path:  path,
+				field: field,
+				index: int(index64),
+			})
+			path = make([]string, 0)
+
+			// Get the next struct type, dropping ptrs.
+			if field.typ.Kind() == reflect.Ptr {
+				t = field.typ.Elem()
+			} else {
+				t = field.typ
+			}
+			if t.Kind() == reflect.Slice {
+				t = t.Elem()
+				if t.Kind() == reflect.Ptr {
+					t = t.Elem()
+				}
+			}
+		} else if field.typ.Kind() == reflect.Ptr {
+			t = field.typ.Elem()
+		} else {
+			t = field.typ
+		}
+	}
+	// Add the remaining.
+	parts = append(parts, pathPart{
+		path:  path,
+		field: field,
+		index: -1,
+	})
+	return parts, nil
+}
+
+// get returns a cached structInfo, creating it if necessary.
+func (c *cache) get(t reflect.Type) *structInfo {
+	c.l.RLock()
+	info := c.m[t]
+	c.l.RUnlock()
+	if info == nil {
+		info = c.create(t, "")
+		c.l.Lock()
+		c.m[t] = info
+		c.l.Unlock()
+	}
+	return info
+}
+
+// create creates a structInfo with meta-data about a struct.
+func (c *cache) create(t reflect.Type, parentAlias string) *structInfo {
+	info := &structInfo{}
+	var anonymousInfos []*structInfo
+	for i := 0; i < t.NumField(); i++ {
+		if f := c.createField(t.Field(i), parentAlias); f != nil {
+			info.fields = append(info.fields, f)
+			if ft := indirectType(f.typ); ft.Kind() == reflect.Struct && f.isAnonymous {
+				anonymousInfos = append(anonymousInfos, c.create(ft, f.canonicalAlias))
+			}
+		}
+	}
+	for i, a := range anonymousInfos {
+		others := []*structInfo{info}
+		others = append(others, anonymousInfos[:i]...)
+		others = append(others, anonymousInfos[i+1:]...)
+		for _, f := range a.fields {
+			if !containsAlias(others, f.alias) {
+				info.fields = append(info.fields, f)
+			}
+		}
+	}
+	return info
+}
+
+// createField creates a fieldInfo for the given field.
+func (c *cache) createField(field reflect.StructField, parentAlias string) *fieldInfo {
+	alias, options := fieldAlias(field, c.tag)
+	if alias == "-" {
+		// Ignore this field.
+		return nil
+	}
+	canonicalAlias := alias
+	if parentAlias != "" {
+		canonicalAlias = parentAlias + "." + alias
+	}
+	// Check if the type is supported and don't cache it if not.
+	// First let's get the basic type.
+	isSlice, isStruct := false, false
+	ft := field.Type
+	m := isTextUnmarshaler(reflect.Zero(ft))
+	if ft.Kind() == reflect.Ptr {
+		ft = ft.Elem()
+	}
+	if isSlice = ft.Kind() == reflect.Slice; isSlice {
+		ft = ft.Elem()
+		if ft.Kind() == reflect.Ptr {
+			ft = ft.Elem()
+		}
+	}
+	if ft.Kind() == reflect.Array {
+		ft = ft.Elem()
+		if ft.Kind() == reflect.Ptr {
+			ft = ft.Elem()
+		}
+	}
+	if isStruct = ft.Kind() == reflect.Struct; !isStruct {
+		if c.converter(ft) == nil && builtinConverters[ft.Kind()] == nil {
+			// Type is not supported.
+			return nil
+		}
+	}
+
+	return &fieldInfo{
+		typ:              field.Type,
+		name:             field.Name,
+		alias:            alias,
+		canonicalAlias:   canonicalAlias,
+		unmarshalerInfo:  m,
+		isSliceOfStructs: isSlice && isStruct,
+		isAnonymous:      field.Anonymous,
+		isRequired:       options.Contains("required"),
+	}
+}
+
+// converter returns the converter for a type.
+func (c *cache) converter(t reflect.Type) Converter {
+	return c.regconv[t]
+}
+
+// ----------------------------------------------------------------------------
+
+type structInfo struct {
+	fields []*fieldInfo
+}
+
+func (i *structInfo) get(alias string) *fieldInfo {
+	for _, field := range i.fields {
+		if strings.EqualFold(field.alias, alias) {
+			return field
+		}
+	}
+	return nil
+}
+
+func containsAlias(infos []*structInfo, alias string) bool {
+	for _, info := range infos {
+		if info.get(alias) != nil {
+			return true
+		}
+	}
+	return false
+}
+
+type fieldInfo struct {
+	typ reflect.Type
+	// name is the field name in the struct.
+	name  string
+	alias string
+	// canonicalAlias is almost the same as the alias, but is prefixed with
+	// an embedded struct field alias in dotted notation if this field is
+	// promoted from the struct.
+	// For instance, if the alias is "N" and this field is an embedded field
+	// in a struct "X", canonicalAlias will be "X.N".
+	canonicalAlias string
+	// unmarshalerInfo contains information regarding the
+	// encoding.TextUnmarshaler implementation of the field type.
+	unmarshalerInfo unmarshaler
+	// isSliceOfStructs indicates if the field type is a slice of structs.
+	isSliceOfStructs bool
+	// isAnonymous indicates whether the field is embedded in the struct.
+	isAnonymous bool
+	isRequired  bool
+}
+
+func (f *fieldInfo) paths(prefix string) []string {
+	if f.alias == f.canonicalAlias {
+		return []string{prefix + f.alias}
+	}
+	return []string{prefix + f.alias, prefix + f.canonicalAlias}
+}
+
+type pathPart struct {
+	field *fieldInfo
+	path  []string // path to the field: walks structs using field names.
+	index int      // struct index in slices of structs.
+}
+
+// ----------------------------------------------------------------------------
+
+func indirectType(typ reflect.Type) reflect.Type {
+	if typ.Kind() == reflect.Ptr {
+		return typ.Elem()
+	}
+	return typ
+}
+
+// fieldAlias parses a field tag to get a field alias.
+func fieldAlias(field reflect.StructField, tagName string) (alias string, options tagOptions) {
+	if tag := field.Tag.Get(tagName); tag != "" {
+		alias, options = parseTag(tag)
+	}
+	if alias == "" {
+		alias = field.Name
+	}
+	return alias, options
+}
+
+// tagOptions is the string following a comma in a struct field's tag, or
+// the empty string. It does not include the leading comma.
+type tagOptions []string
+
+// parseTag splits a struct field's url tag into its name and comma-separated
+// options.
+func parseTag(tag string) (string, tagOptions) {
+	s := strings.Split(tag, ",")
+	return s[0], s[1:]
+}
+
+// Contains checks whether the tagOptions contains the specified option.
+func (o tagOptions) Contains(option string) bool {
+	for _, s := range o {
+		if s == option {
+			return true
+		}
+	}
+	return false
+}

internal/schema/converter.go

@@ -0,0 +1,145 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package schema
+
+import (
+	"reflect"
+	"strconv"
+)
+
+type Converter func(string) reflect.Value
+
+var (
+	invalidValue = reflect.Value{}
+	boolType     = reflect.Bool
+	float32Type  = reflect.Float32
+	float64Type  = reflect.Float64
+	intType      = reflect.Int
+	int8Type     = reflect.Int8
+	int16Type    = reflect.Int16
+	int32Type    = reflect.Int32
+	int64Type    = reflect.Int64
+	stringType   = reflect.String
+	uintType     = reflect.Uint
+	uint8Type    = reflect.Uint8
+	uint16Type   = reflect.Uint16
+	uint32Type   = reflect.Uint32
+	uint64Type   = reflect.Uint64
+)
+
+// Default converters for basic types.
+var builtinConverters = map[reflect.Kind]Converter{
+	boolType:    convertBool,
+	float32Type: convertFloat32,
+	float64Type: convertFloat64,
+	intType:     convertInt,
+	int8Type:    convertInt8,
+	int16Type:   convertInt16,
+	int32Type:   convertInt32,
+	int64Type:   convertInt64,
+	stringType:  convertString,
+	uintType:    convertUint,
+	uint8Type:   convertUint8,
+	uint16Type:  convertUint16,
+	uint32Type:  convertUint32,
+	uint64Type:  convertUint64,
+}
+
+func convertBool(value string) reflect.Value {
+	if value == "on" {
+		return reflect.ValueOf(true)
+	} else if v, err := strconv.ParseBool(value); err == nil {
+		return reflect.ValueOf(v)
+	}
+	return invalidValue
+}
+
+func convertFloat32(value string) reflect.Value {
+	if v, err := strconv.ParseFloat(value, 32); err == nil {
+		return reflect.ValueOf(float32(v))
+	}
+	return invalidValue
+}
+
+func convertFloat64(value string) reflect.Value {
+	if v, err := strconv.ParseFloat(value, 64); err == nil {
+		return reflect.ValueOf(v)
+	}
+	return invalidValue
+}
+
+func convertInt(value string) reflect.Value {
+	if v, err := strconv.ParseInt(value, 10, 0); err == nil {
+		return reflect.ValueOf(int(v))
+	}
+	return invalidValue
+}
+
+func convertInt8(value string) reflect.Value {
+	if v, err := strconv.ParseInt(value, 10, 8); err == nil {
+		return reflect.ValueOf(int8(v))
+	}
+	return invalidValue
+}
+
+func convertInt16(value string) reflect.Value {
+	if v, err := strconv.ParseInt(value, 10, 16); err == nil {
+		return reflect.ValueOf(int16(v))
+	}
+	return invalidValue
+}
+
+func convertInt32(value string) reflect.Value {
+	if v, err := strconv.ParseInt(value, 10, 32); err == nil {
+		return reflect.ValueOf(int32(v))
+	}
+	return invalidValue
+}
+
+func convertInt64(value string) reflect.Value {
+	if v, err := strconv.ParseInt(value, 10, 64); err == nil {
+		return reflect.ValueOf(v)
+	}
+	return invalidValue
+}
+
+func convertString(value string) reflect.Value {
+	return reflect.ValueOf(value)
+}
+
+func convertUint(value string) reflect.Value {
+	if v, err := strconv.ParseUint(value, 10, 0); err == nil {
+		return reflect.ValueOf(uint(v))
+	}
+	return invalidValue
+}
+
+func convertUint8(value string) reflect.Value {
+	if v, err := strconv.ParseUint(value, 10, 8); err == nil {
+		return reflect.ValueOf(uint8(v))
+	}
+	return invalidValue
+}
+
+func convertUint16(value string) reflect.Value {
+	if v, err := strconv.ParseUint(value, 10, 16); err == nil {
+		return reflect.ValueOf(uint16(v))
+	}
+	return invalidValue
+}
+
+func convertUint32(value string) reflect.Value {
+	if v, err := strconv.ParseUint(value, 10, 32); err == nil {
+		return reflect.ValueOf(uint32(v))
+	}
+	return invalidValue
+}
+
+func convertUint64(value string) reflect.Value {
+	if v, err := strconv.ParseUint(value, 10, 64); err == nil {
+		return reflect.ValueOf(v)
+	}
+	return invalidValue
+}

internal/schema/decoder.go

@@ -0,0 +1,534 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package schema
+
+import (
+	"encoding"
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+// NewDecoder returns a new Decoder.
+func NewDecoder() *Decoder {
+	return &Decoder{cache: newCache()}
+}
+
+// Decoder decodes values from a map[string][]string to a struct.
+type Decoder struct {
+	cache             *cache
+	zeroEmpty         bool
+	ignoreUnknownKeys bool
+}
+
+// SetAliasTag changes the tag used to locate custom field aliases.
+// The default tag is "schema".
+func (d *Decoder) SetAliasTag(tag string) {
+	d.cache.tag = tag
+}
+
+// ZeroEmpty controls the behaviour when the decoder encounters empty values
+// in a map.
+// If z is true and a key in the map has the empty string as a value
+// then the corresponding struct field is set to the zero value.
+// If z is false then empty strings are ignored.
+//
+// The default value is false, that is empty values do not change
+// the value of the struct field.
+func (d *Decoder) ZeroEmpty(z bool) {
+	d.zeroEmpty = z
+}
+
+// IgnoreUnknownKeys controls the behaviour when the decoder encounters unknown
+// keys in the map.
+// If i is true and an unknown field is encountered, it is ignored. This is
+// similar to how unknown keys are handled by encoding/json.
+// If i is false then Decode will return an error. Note that any valid keys
+// will still be decoded in to the target struct.
+//
+// To preserve backwards compatibility, the default value is false.
+func (d *Decoder) IgnoreUnknownKeys(i bool) {
+	d.ignoreUnknownKeys = i
+}
+
+// RegisterConverter registers a converter function for a custom type.
+func (d *Decoder) RegisterConverter(value interface{}, converterFunc Converter) {
+	d.cache.registerConverter(value, converterFunc)
+}
+
+// Decode decodes a map[string][]string to a struct.
+//
+// The first parameter must be a pointer to a struct.
+//
+// The second parameter is a map, typically url.Values from an HTTP request.
+// Keys are "paths" in dotted notation to the struct fields and nested structs.
+//
+// See the package documentation for a full explanation of the mechanics.
+func (d *Decoder) Decode(dst interface{}, src map[string][]string) error {
+	v := reflect.ValueOf(dst)
+	if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
+		return errors.New("schema: interface must be a pointer to struct")
+	}
+	v = v.Elem()
+	t := v.Type()
+	multiError := MultiError{}
+	for path, values := range src {
+		if parts, err := d.cache.parsePath(path, t); err == nil {
+			if err = d.decode(v, path, parts, values); err != nil {
+				multiError[path] = err
+			}
+		} else if !d.ignoreUnknownKeys {
+			multiError[path] = UnknownKeyError{Key: path}
+		}
+	}
+	multiError.merge(d.checkRequired(t, src))
+	if len(multiError) > 0 {
+		return multiError
+	}
+	return nil
+}
+
+// checkRequired checks whether required fields are empty
+//
+// check type t recursively if t has struct fields.
+//
+// src is the source map for decoding, we use it here to see if those required fields are included in src
+func (d *Decoder) checkRequired(t reflect.Type, src map[string][]string) MultiError {
+	m, errs := d.findRequiredFields(t, "", "")
+	for key, fields := range m {
+		if isEmptyFields(fields, src) {
+			errs[key] = EmptyFieldError{Key: key}
+		}
+	}
+	return errs
+}
+
+// findRequiredFields recursively searches the struct type t for required fields.
+//
+// canonicalPrefix and searchPrefix are used to resolve full paths in dotted notation
+// for nested struct fields. canonicalPrefix is a complete path which never omits
+// any embedded struct fields. searchPrefix is a user-friendly path which may omit
+// some embedded struct fields to point promoted fields.
+func (d *Decoder) findRequiredFields(t reflect.Type, canonicalPrefix, searchPrefix string) (map[string][]fieldWithPrefix, MultiError) {
+	struc := d.cache.get(t)
+	if struc == nil {
+		// unexpect, cache.get never return nil
+		return nil, MultiError{canonicalPrefix + "*": errors.New("cache fail")}
+	}
+
+	m := map[string][]fieldWithPrefix{}
+	errs := MultiError{}
+	for _, f := range struc.fields {
+		if f.typ.Kind() == reflect.Struct {
+			fcprefix := canonicalPrefix + f.canonicalAlias + "."
+			for _, fspath := range f.paths(searchPrefix) {
+				fm, ferrs := d.findRequiredFields(f.typ, fcprefix, fspath+".")
+				for key, fields := range fm {
+					m[key] = append(m[key], fields...)
+				}
+				errs.merge(ferrs)
+			}
+		}
+		if f.isRequired {
+			key := canonicalPrefix + f.canonicalAlias
+			m[key] = append(m[key], fieldWithPrefix{
+				fieldInfo: f,
+				prefix:    searchPrefix,
+			})
+		}
+	}
+	return m, errs
+}
+
+type fieldWithPrefix struct {
+	*fieldInfo
+	prefix string
+}
+
+// isEmptyFields returns true if all of specified fields are empty.
+func isEmptyFields(fields []fieldWithPrefix, src map[string][]string) bool {
+	for _, f := range fields {
+		for _, path := range f.paths(f.prefix) {
+			v, ok := src[path]
+			if ok && !isEmpty(f.typ, v) {
+				return false
+			}
+			for key := range src {
+				// issue references:
+				// https://github.com/gofiber/fiber/issues/1414
+				// https://github.com/gorilla/schema/issues/176
+				nested := strings.IndexByte(key, '.') != -1
+
+				// for non required nested structs
+				c1 := strings.HasSuffix(f.prefix, ".") && key == path
+
+				// for required nested structs
+				c2 := f.prefix == "" && nested && strings.HasPrefix(key, path)
+
+				// for non nested fields
+				c3 := f.prefix == "" && !nested && key == path
+				if !isEmpty(f.typ, src[key]) && (c1 || c2 || c3) {
+					return false
+				}
+			}
+		}
+	}
+	return true
+}
+
+// isEmpty returns true if value is empty for specific type
+func isEmpty(t reflect.Type, value []string) bool {
+	if len(value) == 0 {
+		return true
+	}
+	switch t.Kind() {
+	case boolType, float32Type, float64Type, intType, int8Type, int32Type, int64Type, stringType, uint8Type, uint16Type, uint32Type, uint64Type:
+		return len(value[0]) == 0
+	}
+	return false
+}
+
+// decode fills a struct field using a parsed path.
+func (d *Decoder) decode(v reflect.Value, path string, parts []pathPart, values []string) error {
+	// Get the field walking the struct fields by index.
+	for _, name := range parts[0].path {
+		if v.Type().Kind() == reflect.Ptr {
+			if v.IsNil() {
+				v.Set(reflect.New(v.Type().Elem()))
+			}
+			v = v.Elem()
+		}
+
+		// alloc embedded structs
+		if v.Type().Kind() == reflect.Struct {
+			for i := 0; i < v.NumField(); i++ {
+				field := v.Field(i)
+				if field.Type().Kind() == reflect.Ptr && field.IsNil() && v.Type().Field(i).Anonymous {
+					field.Set(reflect.New(field.Type().Elem()))
+				}
+			}
+		}
+
+		v = v.FieldByName(name)
+	}
+	// Don't even bother for unexported fields.
+	if !v.CanSet() {
+		return nil
+	}
+
+	// Dereference if needed.
+	t := v.Type()
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+		if v.IsNil() {
+			v.Set(reflect.New(t))
+		}
+		v = v.Elem()
+	}
+
+	// Slice of structs. Let's go recursive.
+	if len(parts) > 1 {
+		idx := parts[0].index
+		if v.IsNil() || v.Len() < idx+1 {
+			value := reflect.MakeSlice(t, idx+1, idx+1)
+			if v.Len() < idx+1 {
+				// Resize it.
+				reflect.Copy(value, v)
+			}
+			v.Set(value)
+		}
+		return d.decode(v.Index(idx), path, parts[1:], values)
+	}
+
+	// Get the converter early in case there is one for a slice type.
+	conv := d.cache.converter(t)
+	m := isTextUnmarshaler(v)
+	if conv == nil && t.Kind() == reflect.Slice && m.IsSliceElement {
+		var items []reflect.Value
+		elemT := t.Elem()
+		isPtrElem := elemT.Kind() == reflect.Ptr
+		if isPtrElem {
+			elemT = elemT.Elem()
+		}
+
+		// Try to get a converter for the element type.
+		conv := d.cache.converter(elemT)
+		if conv == nil {
+			conv = builtinConverters[elemT.Kind()]
+			if conv == nil {
+				// As we are not dealing with slice of structs here, we don't need to check if the type
+				// implements TextUnmarshaler interface
+				return fmt.Errorf("schema: converter not found for %v", elemT)
+			}
+		}
+
+		for key, value := range values {
+			if value == "" {
+				if d.zeroEmpty {
+					items = append(items, reflect.Zero(elemT))
+				}
+			} else if m.IsValid {
+				u := reflect.New(elemT)
+				if m.IsSliceElementPtr {
+					u = reflect.New(reflect.PtrTo(elemT).Elem())
+				}
+				if err := u.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(value)); err != nil {
+					return ConversionError{
+						Key:   path,
+						Type:  t,
+						Index: key,
+						Err:   err,
+					}
+				}
+				if m.IsSliceElementPtr {
+					items = append(items, u.Elem().Addr())
+				} else if u.Kind() == reflect.Ptr {
+					items = append(items, u.Elem())
+				} else {
+					items = append(items, u)
+				}
+			} else if item := conv(value); item.IsValid() {
+				if isPtrElem {
+					ptr := reflect.New(elemT)
+					ptr.Elem().Set(item)
+					item = ptr
+				}
+				if item.Type() != elemT && !isPtrElem {
+					item = item.Convert(elemT)
+				}
+				items = append(items, item)
+			} else {
+				if strings.Contains(value, ",") {
+					values := strings.Split(value, ",")
+					for _, value := range values {
+						if value == "" {
+							if d.zeroEmpty {
+								items = append(items, reflect.Zero(elemT))
+							}
+						} else if item := conv(value); item.IsValid() {
+							if isPtrElem {
+								ptr := reflect.New(elemT)
+								ptr.Elem().Set(item)
+								item = ptr
+							}
+							if item.Type() != elemT && !isPtrElem {
+								item = item.Convert(elemT)
+							}
+							items = append(items, item)
+						} else {
+							return ConversionError{
+								Key:   path,
+								Type:  elemT,
+								Index: key,
+							}
+						}
+					}
+				} else {
+					return ConversionError{
+						Key:   path,
+						Type:  elemT,
+						Index: key,
+					}
+				}
+			}
+		}
+		value := reflect.Append(reflect.MakeSlice(t, 0, 0), items...)
+		v.Set(value)
+	} else {
+		val := ""
+		// Use the last value provided if any values were provided
+		if len(values) > 0 {
+			val = values[len(values)-1]
+		}
+
+		if conv != nil {
+			if value := conv(val); value.IsValid() {
+				v.Set(value.Convert(t))
+			} else {
+				return ConversionError{
+					Key:   path,
+					Type:  t,
+					Index: -1,
+				}
+			}
+		} else if m.IsValid {
+			if m.IsPtr {
+				u := reflect.New(v.Type())
+				if err := u.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(val)); err != nil {
+					return ConversionError{
+						Key:   path,
+						Type:  t,
+						Index: -1,
+						Err:   err,
+					}
+				}
+				v.Set(reflect.Indirect(u))
+			} else {
+				// If the value implements the encoding.TextUnmarshaler interface
+				// apply UnmarshalText as the converter
+				if err := m.Unmarshaler.UnmarshalText([]byte(val)); err != nil {
+					return ConversionError{
+						Key:   path,
+						Type:  t,
+						Index: -1,
+						Err:   err,
+					}
+				}
+			}
+		} else if val == "" {
+			if d.zeroEmpty {
+				v.Set(reflect.Zero(t))
+			}
+		} else if conv := builtinConverters[t.Kind()]; conv != nil {
+			if value := conv(val); value.IsValid() {
+				v.Set(value.Convert(t))
+			} else {
+				return ConversionError{
+					Key:   path,
+					Type:  t,
+					Index: -1,
+				}
+			}
+		} else {
+			return fmt.Errorf("schema: converter not found for %v", t)
+		}
+	}
+	return nil
+}
+
+func isTextUnmarshaler(v reflect.Value) unmarshaler {
+	// Create a new unmarshaller instance
+	m := unmarshaler{}
+	if m.Unmarshaler, m.IsValid = v.Interface().(encoding.TextUnmarshaler); m.IsValid {
+		return m
+	}
+	// As the UnmarshalText function should be applied to the pointer of the
+	// type, we check that type to see if it implements the necessary
+	// method.
+	if m.Unmarshaler, m.IsValid = reflect.New(v.Type()).Interface().(encoding.TextUnmarshaler); m.IsValid {
+		m.IsPtr = true
+		return m
+	}
+
+	// if v is []T or *[]T create new T
+	t := v.Type()
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	if t.Kind() == reflect.Slice {
+		// Check if the slice implements encoding.TextUnmarshaller
+		if m.Unmarshaler, m.IsValid = v.Interface().(encoding.TextUnmarshaler); m.IsValid {
+			return m
+		}
+		// If t is a pointer slice, check if its elements implement
+		// encoding.TextUnmarshaler
+		m.IsSliceElement = true
+		if t = t.Elem(); t.Kind() == reflect.Ptr {
+			t = reflect.PtrTo(t.Elem())
+			v = reflect.Zero(t)
+			m.IsSliceElementPtr = true
+			m.Unmarshaler, m.IsValid = v.Interface().(encoding.TextUnmarshaler)
+			return m
+		}
+	}
+
+	v = reflect.New(t)
+	m.Unmarshaler, m.IsValid = v.Interface().(encoding.TextUnmarshaler)
+	return m
+}
+
+// TextUnmarshaler helpers ----------------------------------------------------
+// unmarshaller contains information about a TextUnmarshaler type
+type unmarshaler struct {
+	Unmarshaler encoding.TextUnmarshaler
+	// IsValid indicates whether the resolved type indicated by the other
+	// flags implements the encoding.TextUnmarshaler interface.
+	IsValid bool
+	// IsPtr indicates that the resolved type is the pointer of the original
+	// type.
+	IsPtr bool
+	// IsSliceElement indicates that the resolved type is a slice element of
+	// the original type.
+	IsSliceElement bool
+	// IsSliceElementPtr indicates that the resolved type is a pointer to a
+	// slice element of the original type.
+	IsSliceElementPtr bool
+}
+
+// Errors ---------------------------------------------------------------------
+
+// ConversionError stores information about a failed conversion.
+type ConversionError struct {
+	Key   string       // key from the source map.
+	Type  reflect.Type // expected type of elem
+	Index int          // index for multi-value fields; -1 for single-value fields.
+	Err   error        // low-level error (when it exists)
+}
+
+func (e ConversionError) Error() string {
+	var output string
+
+	if e.Index < 0 {
+		output = fmt.Sprintf("schema: error converting value for %q", e.Key)
+	} else {
+		output = fmt.Sprintf("schema: error converting value for index %d of %q",
+			e.Index, e.Key)
+	}
+
+	if e.Err != nil {
+		output = fmt.Sprintf("%s. Details: %s", output, e.Err)
+	}
+
+	return output
+}
+
+// UnknownKeyError stores information about an unknown key in the source map.
+type UnknownKeyError struct {
+	Key string // key from the source map.
+}
+
+func (e UnknownKeyError) Error() string {
+	return fmt.Sprintf("schema: invalid path %q", e.Key)
+}
+
+// EmptyFieldError stores information about an empty required field.
+type EmptyFieldError struct {
+	Key string // required key in the source map.
+}
+
+func (e EmptyFieldError) Error() string {
+	return fmt.Sprintf("%v is empty", e.Key)
+}
+
+// MultiError stores multiple decoding errors.
+//
+// Borrowed from the App Engine SDK.
+type MultiError map[string]error
+
+func (e MultiError) Error() string {
+	s := ""
+	for _, err := range e {
+		s = err.Error()
+		break
+	}
+	switch len(e) {
+	case 0:
+		return "(0 errors)"
+	case 1:
+		return s
+	case 2:
+		return s + " (and 1 other error)"
+	}
+	return fmt.Sprintf("%s (and %d other errors)", s, len(e)-1)
+}
+
+func (e MultiError) merge(errors MultiError) {
+	for key, err := range errors {
+		if e[key] == nil {
+			e[key] = err
+		}
+	}
+}

internal/schema/doc.go

@@ -0,0 +1,148 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package gorilla/schema fills a struct with form values.
+
+The basic usage is really simple. Given this struct:
+
+	type Person struct {
+		Name  string
+		Phone string
+	}
+
+...we can fill it passing a map to the Decode() function:
+
+	values := map[string][]string{
+		"Name":  {"John"},
+		"Phone": {"999-999-999"},
+	}
+	person := new(Person)
+	decoder := schema.NewDecoder()
+	decoder.Decode(person, values)
+
+This is just a simple example and it doesn't make a lot of sense to create
+the map manually. Typically it will come from a http.Request object and
+will be of type url.Values, http.Request.Form, or http.Request.MultipartForm:
+
+	func MyHandler(w http.ResponseWriter, r *http.Request) {
+		err := r.ParseForm()
+
+		if err != nil {
+			// Handle error
+		}
+
+		decoder := schema.NewDecoder()
+		// r.PostForm is a map of our POST form values
+		err := decoder.Decode(person, r.PostForm)
+
+		if err != nil {
+			// Handle error
+		}
+
+		// Do something with person.Name or person.Phone
+	}
+
+Note: it is a good idea to set a Decoder instance as a package global,
+because it caches meta-data about structs, and an instance can be shared safely:
+
+	var decoder = schema.NewDecoder()
+
+To define custom names for fields, use a struct tag "schema". To not populate
+certain fields, use a dash for the name and it will be ignored:
+
+	type Person struct {
+		Name  string `schema:"name"`  // custom name
+		Phone string `schema:"phone"` // custom name
+		Admin bool   `schema:"-"`     // this field is never set
+	}
+
+The supported field types in the destination struct are:
+
+  - bool
+  - float variants (float32, float64)
+  - int variants (int, int8, int16, int32, int64)
+  - string
+  - uint variants (uint, uint8, uint16, uint32, uint64)
+  - struct
+  - a pointer to one of the above types
+  - a slice or a pointer to a slice of one of the above types
+
+Non-supported types are simply ignored, however custom types can be registered
+to be converted.
+
+To fill nested structs, keys must use a dotted notation as the "path" for the
+field. So for example, to fill the struct Person below:
+
+	type Phone struct {
+		Label  string
+		Number string
+	}
+
+	type Person struct {
+		Name  string
+		Phone Phone
+	}
+
+...the source map must have the keys "Name", "Phone.Label" and "Phone.Number".
+This means that an HTML form to fill a Person struct must look like this:
+
+	<form>
+		<input type="text" name="Name">
+		<input type="text" name="Phone.Label">
+		<input type="text" name="Phone.Number">
+	</form>
+
+Single values are filled using the first value for a key from the source map.
+Slices are filled using all values for a key from the source map. So to fill
+a Person with multiple Phone values, like:
+
+	type Person struct {
+		Name   string
+		Phones []Phone
+	}
+
+...an HTML form that accepts three Phone values would look like this:
+
+	<form>
+		<input type="text" name="Name">
+		<input type="text" name="Phones.0.Label">
+		<input type="text" name="Phones.0.Number">
+		<input type="text" name="Phones.1.Label">
+		<input type="text" name="Phones.1.Number">
+		<input type="text" name="Phones.2.Label">
+		<input type="text" name="Phones.2.Number">
+	</form>
+
+Notice that only for slices of structs the slice index is required.
+This is needed for disambiguation: if the nested struct also had a slice
+field, we could not translate multiple values to it if we did not use an
+index for the parent struct.
+
+There's also the possibility to create a custom type that implements the
+TextUnmarshaler interface, and in this case there's no need to register
+a converter, like:
+
+	type Person struct {
+	  Emails []Email
+	}
+
+	type Email struct {
+	  *mail.Address
+	}
+
+	func (e *Email) UnmarshalText(text []byte) (err error) {
+		e.Address, err = mail.ParseAddress(string(text))
+		return
+	}
+
+...an HTML form that accepts three Email values would look like this:
+
+	<form>
+		<input type="email" name="Emails.0">
+		<input type="email" name="Emails.1">
+		<input type="email" name="Emails.2">
+	</form>
+*/
+package schema

internal/schema/encoder.go

@@ -0,0 +1,202 @@
+package schema
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+)
+
+type encoderFunc func(reflect.Value) string
+
+// Encoder encodes values from a struct into url.Values.
+type Encoder struct {
+	cache  *cache
+	regenc map[reflect.Type]encoderFunc
+}
+
+// NewEncoder returns a new Encoder with defaults.
+func NewEncoder() *Encoder {
+	return &Encoder{cache: newCache(), regenc: make(map[reflect.Type]encoderFunc)}
+}
+
+// Encode encodes a struct into map[string][]string.
+//
+// Intended for use with url.Values.
+func (e *Encoder) Encode(src interface{}, dst map[string][]string) error {
+	v := reflect.ValueOf(src)
+
+	return e.encode(v, dst)
+}
+
+// RegisterEncoder registers a converter for encoding a custom type.
+func (e *Encoder) RegisterEncoder(value interface{}, encoder func(reflect.Value) string) {
+	e.regenc[reflect.TypeOf(value)] = encoder
+}
+
+// SetAliasTag changes the tag used to locate custom field aliases.
+// The default tag is "schema".
+func (e *Encoder) SetAliasTag(tag string) {
+	e.cache.tag = tag
+}
+
+// isValidStructPointer test if input value is a valid struct pointer.
+func isValidStructPointer(v reflect.Value) bool {
+	return v.Type().Kind() == reflect.Ptr && v.Elem().IsValid() && v.Elem().Type().Kind() == reflect.Struct
+}
+
+func isZero(v reflect.Value) bool {
+	switch v.Kind() {
+	case reflect.Func:
+	case reflect.Map, reflect.Slice:
+		return v.IsNil() || v.Len() == 0
+	case reflect.Array:
+		z := true
+		for i := 0; i < v.Len(); i++ {
+			z = z && isZero(v.Index(i))
+		}
+		return z
+	case reflect.Struct:
+		type zero interface {
+			IsZero() bool
+		}
+		if v.Type().Implements(reflect.TypeOf((*zero)(nil)).Elem()) {
+			iz := v.MethodByName("IsZero").Call([]reflect.Value{})[0]
+			return iz.Interface().(bool)
+		}
+		z := true
+		for i := 0; i < v.NumField(); i++ {
+			z = z && isZero(v.Field(i))
+		}
+		return z
+	}
+	// Compare other types directly:
+	z := reflect.Zero(v.Type())
+	return v.Interface() == z.Interface()
+}
+
+func (e *Encoder) encode(v reflect.Value, dst map[string][]string) error {
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+	if v.Kind() != reflect.Struct {
+		return errors.New("schema: interface must be a struct")
+	}
+	t := v.Type()
+
+	errors := MultiError{}
+
+	for i := 0; i < v.NumField(); i++ {
+		name, opts := fieldAlias(t.Field(i), e.cache.tag)
+		if name == "-" {
+			continue
+		}
+
+		// Encode struct pointer types if the field is a valid pointer and a struct.
+		if isValidStructPointer(v.Field(i)) {
+			_ = e.encode(v.Field(i).Elem(), dst)
+			continue
+		}
+
+		encFunc := typeEncoder(v.Field(i).Type(), e.regenc)
+
+		// Encode non-slice types and custom implementations immediately.
+		if encFunc != nil {
+			value := encFunc(v.Field(i))
+			if opts.Contains("omitempty") && isZero(v.Field(i)) {
+				continue
+			}
+
+			dst[name] = append(dst[name], value)
+			continue
+		}
+
+		if v.Field(i).Type().Kind() == reflect.Struct {
+			_ = e.encode(v.Field(i), dst)
+			continue
+		}
+
+		if v.Field(i).Type().Kind() == reflect.Slice {
+			encFunc = typeEncoder(v.Field(i).Type().Elem(), e.regenc)
+		}
+
+		if encFunc == nil {
+			errors[v.Field(i).Type().String()] = fmt.Errorf("schema: encoder not found for %v", v.Field(i))
+			continue
+		}
+
+		// Encode a slice.
+		if v.Field(i).Len() == 0 && opts.Contains("omitempty") {
+			continue
+		}
+
+		dst[name] = []string{}
+		for j := 0; j < v.Field(i).Len(); j++ {
+			dst[name] = append(dst[name], encFunc(v.Field(i).Index(j)))
+		}
+	}
+
+	if len(errors) > 0 {
+		return errors
+	}
+	return nil
+}
+
+func typeEncoder(t reflect.Type, reg map[reflect.Type]encoderFunc) encoderFunc {
+	if f, ok := reg[t]; ok {
+		return f
+	}
+
+	switch t.Kind() {
+	case reflect.Bool:
+		return encodeBool
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return encodeInt
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return encodeUint
+	case reflect.Float32:
+		return encodeFloat32
+	case reflect.Float64:
+		return encodeFloat64
+	case reflect.Ptr:
+		f := typeEncoder(t.Elem(), reg)
+		return func(v reflect.Value) string {
+			if v.IsNil() {
+				return "null"
+			}
+			return f(v.Elem())
+		}
+	case reflect.String:
+		return encodeString
+	default:
+		return nil
+	}
+}
+
+func encodeBool(v reflect.Value) string {
+	return strconv.FormatBool(v.Bool())
+}
+
+func encodeInt(v reflect.Value) string {
+	return strconv.FormatInt(int64(v.Int()), 10)
+}
+
+func encodeUint(v reflect.Value) string {
+	return strconv.FormatUint(uint64(v.Uint()), 10)
+}
+
+func encodeFloat(v reflect.Value, bits int) string {
+	return strconv.FormatFloat(v.Float(), 'f', 6, bits)
+}
+
+func encodeFloat32(v reflect.Value) string {
+	return encodeFloat(v, 32)
+}
+
+func encodeFloat64(v reflect.Value) string {
+	return encodeFloat(v, 64)
+}
+
+func encodeString(v reflect.Value) string {
+	return v.String()
+}

middleware.go

@@ -0,0 +1,23 @@
+package nf
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+)
+
+func NewRecover(enableStackTrace bool) HandlerFunc {
+	return func(c *Ctx) error {
+		defer func() {
+			if r := recover(); r != nil {
+				if enableStackTrace {
+					os.Stderr.WriteString(fmt.Sprintf("recovered from panic: %v\n%s\n", r, debug.Stack()))
+				} else {
+					os.Stderr.WriteString(fmt.Sprintf("recovered from panic: %v\n", r))
+				}
+			}
+		}()
+
+		return c.Next()
+	}
+}

nf.go

@@ -0,0 +1,45 @@
+package nf
+
+const (
+	banner = "  _  _     _     ___                 _ \n | \\| |___| |_  | __|__ _  _ _ _  __| |\n | .` / _ \\  _| | _/ _ \\ || | ' \\/ _` |\n |_|\\_\\___/\\__| |_|\\___/\\_,_|_||_\\__,_|\n "
+)
+
+type Map map[string]interface{}
+
+type Config struct {
+	// Default: 4 * 1024 * 1024
+	BodyLimit      int64 `json:"-"`
+	DisableBanner  bool  `json:"-"`
+	DisableLogger  bool  `json:"-"`
+	DisableRecover bool  `json:"-"`
+}
+
+var (
+	defaultConfig = &Config{
+		BodyLimit: 4 * 1024 * 1024,
+	}
+)
+
+func New(config ...Config) *App {
+	app := &App{
+		router: newRouter(),
+	}
+
+	if len(config) > 0 {
+		app.config = &config[0]
+		if app.config.BodyLimit == 0 {
+			app.config.BodyLimit = defaultConfig.BodyLimit
+		}
+	} else {
+		app.config = defaultConfig
+	}
+
+	app.RouterGroup = &RouterGroup{app: app}
+	app.groups = []*RouterGroup{app.RouterGroup}
+
+	if !app.config.DisableRecover {
+		app.Use(NewRecover(true))
+	}
+
+	return app
+}

resp.go

@@ -0,0 +1,49 @@
+package nf
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+func (c *Ctx) Status(code int) *Ctx {
+	c.StatusCode = code
+	c.Writer.WriteHeader(code)
+	return c
+}
+
+func (c *Ctx) SetHeader(key string, value string) {
+	c.Writer.Header().Set(key, value)
+}
+
+func (c *Ctx) SendString(data string) error {
+	c.SetHeader("Content-Type", "text/plain")
+	_, err := c.Write([]byte(data))
+	return err
+}
+
+func (c *Ctx) Writef(format string, values ...interface{}) (int, error) {
+	c.SetHeader("Content-Type", "text/plain")
+	return c.Writer.Write([]byte(fmt.Sprintf(format, values...)))
+}
+
+func (c *Ctx) JSON(data interface{}) error {
+	c.SetHeader("Content-Type", "application/json")
+
+	encoder := json.NewEncoder(c.Writer)
+
+	if err := encoder.Encode(data); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Ctx) Write(data []byte) (int, error) {
+	return c.Writer.Write(data)
+}
+
+func (c *Ctx) HTML(html string) error {
+	c.SetHeader("Content-Type", "text/html")
+	_, err := c.Writer.Write([]byte(html))
+	return err
+}

router.go

@@ -0,0 +1,99 @@
+package nf
+
+import "strings"
+
+type router struct {
+	roots    map[string]*_node
+	handlers map[string][]HandlerFunc
+}
+
+func newRouter() *router {
+	return &router{
+		roots:    make(map[string]*_node),
+		handlers: make(map[string][]HandlerFunc),
+	}
+}
+
+// Only one * is allowed
+func parsePattern(pattern string) []string {
+	vs := strings.Split(pattern, "/")
+
+	parts := make([]string, 0)
+	for _, item := range vs {
+		if item != "" {
+			parts = append(parts, item)
+			if item[0] == '*' {
+				break
+			}
+		}
+	}
+	return parts
+}
+
+func (r *router) addRoute(method string, pattern string, handlers ...HandlerFunc) {
+	parts := parsePattern(pattern)
+
+	key := method + "-" + pattern
+	_, ok := r.roots[method]
+	if !ok {
+		r.roots[method] = &_node{}
+	}
+	r.roots[method].insert(pattern, parts, 0)
+	r.handlers[key] = handlers
+}
+
+func (r *router) getRoute(method string, path string) (*_node, map[string]string) {
+	searchParts := parsePattern(path)
+	params := make(map[string]string)
+	root, ok := r.roots[method]
+
+	if !ok {
+		return nil, nil
+	}
+
+	n := root.search(searchParts, 0)
+
+	if n != nil {
+		parts := parsePattern(n.pattern)
+		for index, part := range parts {
+			if part[0] == ':' {
+				params[part[1:]] = searchParts[index]
+			}
+			if part[0] == '*' && len(part) > 1 {
+				params[part[1:]] = strings.Join(searchParts[index:], "/")
+				break
+			}
+		}
+		return n, params
+	}
+
+	return nil, nil
+}
+
+func (r *router) getRoutes(method string) []*_node {
+	root, ok := r.roots[method]
+	if !ok {
+		return nil
+	}
+	nodes := make([]*_node, 0)
+	root.travel(&nodes)
+	return nodes
+}
+
+func (r *router) handle(c *Ctx) error {
+	if err := c.verify(); err != nil {
+		return err
+	}
+
+	node, params := r.getRoute(c.Method, c.path)
+	if node != nil {
+		c.params = params
+		key := c.Method + "-" + node.pattern
+		c.handlers = append(c.handlers, r.handlers[key]...)
+	} else {
+		_, err := c.Writef("404 NOT FOUND: %s\n", c.path)
+		return err
+	}
+
+	return c.Next()
+}

tree.go

@@ -0,0 +1,76 @@
+package nf
+
+import (
+	"strings"
+)
+
+type _node struct {
+	pattern  string
+	part     string
+	children []*_node
+	isWild   bool
+}
+
+func (n *_node) insert(pattern string, parts []string, height int) {
+	if len(parts) == height {
+		n.pattern = pattern
+		return
+	}
+
+	part := parts[height]
+	child := n.matchChild(part)
+	if child == nil {
+		child = &_node{part: part, isWild: part[0] == ':' || part[0] == '*'}
+		n.children = append(n.children, child)
+	}
+	child.insert(pattern, parts, height+1)
+}
+
+func (n *_node) search(parts []string, height int) *_node {
+	if len(parts) == height || strings.HasPrefix(n.part, "*") {
+		if n.pattern == "" {
+			return nil
+		}
+		return n
+	}
+
+	part := parts[height]
+	children := n.matchChildren(part)
+
+	for _, child := range children {
+		result := child.search(parts, height+1)
+		if result != nil {
+			return result
+		}
+	}
+
+	return nil
+}
+
+func (n *_node) travel(list *([]*_node)) {
+	if n.pattern != "" {
+		*list = append(*list, n)
+	}
+	for _, child := range n.children {
+		child.travel(list)
+	}
+}
+
+func (n *_node) matchChild(part string) *_node {
+	for _, child := range n.children {
+		if child.part == part || child.isWild {
+			return child
+		}
+	}
+	return nil
+}
+
+func (n *_node) matchChildren(part string) []*_node {
+	nodes := make([]*_node, 0)
+	for _, child := range n.children {
+		if child.part == part || child.isWild {
+			nodes = append(nodes, child)
+		}
+	}
+	return nodes
+}

util.go

@@ -0,0 +1,81 @@
+package nf
+
+import (
+	"fmt"
+	"github.com/loveuer/nf/internal/schema"
+	"strings"
+)
+
+const (
+	MIMETextXML         = "text/xml"
+	MIMETextHTML        = "text/html"
+	MIMETextPlain       = "text/plain"
+	MIMETextJavaScript  = "text/javascript"
+	MIMEApplicationXML  = "application/xml"
+	MIMEApplicationJSON = "application/json"
+	// Deprecated: use MIMETextJavaScript instead
+	MIMEApplicationJavaScript = "application/javascript"
+	MIMEApplicationForm       = "application/x-www-form-urlencoded"
+	MIMEOctetStream           = "application/octet-stream"
+	MIMEMultipartForm         = "multipart/form-data"
+
+	MIMETextXMLCharsetUTF8         = "text/xml; charset=utf-8"
+	MIMETextHTMLCharsetUTF8        = "text/html; charset=utf-8"
+	MIMETextPlainCharsetUTF8       = "text/plain; charset=utf-8"
+	MIMETextJavaScriptCharsetUTF8  = "text/javascript; charset=utf-8"
+	MIMEApplicationXMLCharsetUTF8  = "application/xml; charset=utf-8"
+	MIMEApplicationJSONCharsetUTF8 = "application/json; charset=utf-8"
+	// Deprecated: use MIMETextJavaScriptCharsetUTF8 instead
+	MIMEApplicationJavaScriptCharsetUTF8 = "application/javascript; charset=utf-8"
+)
+
+func verifyHandlers(path string, handlers ...HandlerFunc) {
+	if len(handlers) == 0 {
+		panic(fmt.Sprintf("missing handler in route: %s", path))
+	}
+
+	for _, handler := range handlers {
+		if handler == nil {
+			panic(fmt.Sprintf("nil handler found in route: %s", path))
+		}
+	}
+}
+
+// parseVendorSpecificContentType check if content type is vendor specific and
+// if it is parsable to any known types. If it's not vendor specific then returns
+// the original content type.
+func parseVendorSpecificContentType(cType string) string {
+	plusIndex := strings.Index(cType, "+")
+
+	if plusIndex == -1 {
+		return cType
+	}
+
+	var parsableType string
+	if semiColonIndex := strings.Index(cType, ";"); semiColonIndex == -1 {
+		parsableType = cType[plusIndex+1:]
+	} else if plusIndex < semiColonIndex {
+		parsableType = cType[plusIndex+1 : semiColonIndex]
+	} else {
+		return cType[:semiColonIndex]
+	}
+
+	slashIndex := strings.Index(cType, "/")
+
+	if slashIndex == -1 {
+		return cType
+	}
+
+	return cType[0:slashIndex+1] + parsableType
+}
+
+func parseToStruct(aliasTag string, out interface{}, data map[string][]string) error {
+	schemaDecoder := schema.NewDecoder()
+	schemaDecoder.SetAliasTag(aliasTag)
+
+	if err := schemaDecoder.Decode(out, data); err != nil {
+		return fmt.Errorf("failed to decode: %w", err)
+	}
+
+	return nil
+}

xtest/basic/basic.http

@@ -0,0 +1,2 @@
+### basic - get
+GET http://127.0.0.1/hello/nf

xtest/basic/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"github.com/loveuer/nf"
+	"log"
+)
+
+func main() {
+	app := nf.New()
+
+	app.Get("/hello/:name", func(c *nf.Ctx) error {
+		name := c.Param("name")
+		return c.JSON(nf.Map{"status": 200, "data": "hello, " + name})
+	})
+
+	log.Fatal(app.Run("0.0.0.0:80"))
+}

xtest/bodyLimit/body_limit.http

@@ -0,0 +1,9 @@
+### body_limit
+POST http://127.0.0.1/data
+Content-Type: application/json
+
+{
+  "name": "zyp",
+  "age": 19,
+  "likes": ["2233"]
+}

xtest/bodyLimit/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"github.com/loveuer/nf"
+	"log"
+)
+
+func main() {
+	app := nf.New(nf.Config{BodyLimit: -1})
+
+	app.Post("/data", func(c *nf.Ctx) error {
+		type Req struct {
+			Name  string   `json:"name"`
+			Age   int      `json:"age"`
+			Likes []string `json:"likes"`
+		}
+
+		var (
+			err error
+			req = new(Req)
+		)
+
+		if err = c.BodyParser(req); err != nil {
+			return c.JSON(nf.Map{"status": 400, "err": err.Error()})
+		}
+
+		return c.JSON(nf.Map{"status": 200, "data": req})
+	})
+
+	app.Post("/url", func(c *nf.Ctx) error {
+		type Req struct {
+			Name  string   `form:"name"`
+			Age   int      `form:"age"`
+			Likes []string `form:"likes"`
+		}
+
+		var (
+			err error
+			req = new(Req)
+		)
+
+		if err = c.BodyParser(req); err != nil {
+			return c.JSON(nf.Map{"status": 400, "err": err.Error()})
+		}
+
+		return c.JSON(nf.Map{"status": 200, "data": req})
+	})
+
+	log.Fatal(app.Run("0.0.0.0:80"))
+}

xtest/panic/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"github.com/loveuer/nf"
+	"log"
+)
+
+func main() {
+	app := nf.New(nf.Config{
+		DisableRecover: true,
+	})
+
+	app.Get("/hello/:name", func(c *nf.Ctx) error {
+		name := c.Param("name")
+
+		if name == "nf" {
+			panic("name is nf")
+		}
+
+		return c.JSON("nice")
+	})
+
+	log.Fatal(app.Run("0.0.0.0:80"))
+}

xtest/panic/panic.http

@@ -0,0 +1,5 @@
+### panic test
+GET http://127.0.0.1/hello/nf
+
+### if covered?
+GET http://127.0.0.1/hello/world

xtest/queryParser/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"github.com/loveuer/nf"
+	"log"
+)
+
+func main() {
+	app := nf.New()
+
+	app.Get("/hello", func(c *nf.Ctx) error {
+		type Req struct {
+			Name  string   `query:"name"`
+			Age   int      `query:"age"`
+			Likes []string `query:"likes"`
+		}
+
+		var (
+			err error
+			req = new(Req)
+		)
+
+		if err = c.QueryParser(req); err != nil {
+			return nf.NewNFError(400, err.Error())
+		}
+
+		return c.JSON(nf.Map{"status": 200, "data": req})
+	})
+
+	log.Fatal(app.Run("0.0.0.0:80"))
+}