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153
vendor/github.com/gin-gonic/gin/utils.go
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vendored
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153
vendor/github.com/gin-gonic/gin/utils.go
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// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package gin
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import (
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"encoding/xml"
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"net/http"
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"os"
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"path"
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"reflect"
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"runtime"
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"strings"
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)
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// BindKey indicates a default bind key.
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const BindKey = "_gin-gonic/gin/bindkey"
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// Bind is a helper function for given interface object and returns a Gin middleware.
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func Bind(val interface{}) HandlerFunc {
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value := reflect.ValueOf(val)
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if value.Kind() == reflect.Ptr {
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panic(`Bind struct can not be a pointer. Example:
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Use: gin.Bind(Struct{}) instead of gin.Bind(&Struct{})
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`)
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}
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typ := value.Type()
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return func(c *Context) {
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obj := reflect.New(typ).Interface()
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if c.Bind(obj) == nil {
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c.Set(BindKey, obj)
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}
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}
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}
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// WrapF is a helper function for wrapping http.HandlerFunc and returns a Gin middleware.
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func WrapF(f http.HandlerFunc) HandlerFunc {
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return func(c *Context) {
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f(c.Writer, c.Request)
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}
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}
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// WrapH is a helper function for wrapping http.Handler and returns a Gin middleware.
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func WrapH(h http.Handler) HandlerFunc {
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return func(c *Context) {
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h.ServeHTTP(c.Writer, c.Request)
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}
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}
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// H is a shortcut for map[string]interface{}
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type H map[string]interface{}
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// MarshalXML allows type H to be used with xml.Marshal.
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func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
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start.Name = xml.Name{
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Space: "",
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Local: "map",
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}
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if err := e.EncodeToken(start); err != nil {
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return err
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}
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for key, value := range h {
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elem := xml.StartElement{
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Name: xml.Name{Space: "", Local: key},
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Attr: []xml.Attr{},
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}
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if err := e.EncodeElement(value, elem); err != nil {
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return err
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}
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}
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return e.EncodeToken(xml.EndElement{Name: start.Name})
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}
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func assert1(guard bool, text string) {
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if !guard {
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panic(text)
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}
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}
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func filterFlags(content string) string {
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for i, char := range content {
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if char == ' ' || char == ';' {
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return content[:i]
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}
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}
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return content
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}
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func chooseData(custom, wildcard interface{}) interface{} {
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if custom != nil {
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return custom
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}
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if wildcard != nil {
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return wildcard
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}
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panic("negotiation config is invalid")
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}
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func parseAccept(acceptHeader string) []string {
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parts := strings.Split(acceptHeader, ",")
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out := make([]string, 0, len(parts))
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for _, part := range parts {
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if i := strings.IndexByte(part, ';'); i > 0 {
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part = part[:i]
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}
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if part = strings.TrimSpace(part); part != "" {
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out = append(out, part)
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}
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}
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return out
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}
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func lastChar(str string) uint8 {
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if str == "" {
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panic("The length of the string can't be 0")
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}
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return str[len(str)-1]
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}
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func nameOfFunction(f interface{}) string {
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return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
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}
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func joinPaths(absolutePath, relativePath string) string {
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if relativePath == "" {
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return absolutePath
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}
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finalPath := path.Join(absolutePath, relativePath)
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if lastChar(relativePath) == '/' && lastChar(finalPath) != '/' {
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return finalPath + "/"
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}
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return finalPath
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}
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func resolveAddress(addr []string) string {
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switch len(addr) {
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case 0:
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if port := os.Getenv("PORT"); port != "" {
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debugPrint("Environment variable PORT=\"%s\"", port)
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return ":" + port
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}
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debugPrint("Environment variable PORT is undefined. Using port :8080 by default")
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return ":8080"
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case 1:
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return addr[0]
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default:
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panic("too many parameters")
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}
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}
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