gin router

vendor/github.com/gin-gonic/contrib/LICENSE

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+MIT License
+
+Copyright (c) 2019 Gin-Gonic
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/gin-gonic/contrib/static/README.md

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+# static
+
+## EOL-warning
+
+**This package has been abandoned on 2016-12-13. Please use [gin-contrib/static](https://github.com/gin-contrib/static) instead.**

vendor/github.com/gin-gonic/contrib/static/static.go

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+package static
+
+import (
+	"net/http"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+type ServeFileSystem interface {
+	http.FileSystem
+	Exists(prefix string, path string) bool
+}
+
+type localFileSystem struct {
+	http.FileSystem
+	root    string
+	indexes bool
+}
+
+func LocalFile(root string, indexes bool) *localFileSystem {
+	return &localFileSystem{
+		FileSystem: gin.Dir(root, indexes),
+		root:       root,
+		indexes:    indexes,
+	}
+}
+
+func (l *localFileSystem) Exists(prefix string, filepath string) bool {
+	if p := strings.TrimPrefix(filepath, prefix); len(p) < len(filepath) {
+		name := path.Join(l.root, p)
+		stats, err := os.Stat(name)
+		if err != nil {
+			return false
+		}
+		if !l.indexes && stats.IsDir() {
+			return false
+		}
+		return true
+	}
+	return false
+}
+
+func ServeRoot(urlPrefix, root string) gin.HandlerFunc {
+	return Serve(urlPrefix, LocalFile(root, false))
+}
+
+// Static returns a middleware handler that serves static files in the given directory.
+func Serve(urlPrefix string, fs ServeFileSystem) gin.HandlerFunc {
+	fileserver := http.FileServer(fs)
+	if urlPrefix != "" {
+		fileserver = http.StripPrefix(urlPrefix, fileserver)
+	}
+	return func(c *gin.Context) {
+		if fs.Exists(urlPrefix, c.Request.URL.Path) {
+			fileserver.ServeHTTP(c.Writer, c.Request)
+			c.Abort()
+		}
+	}
+}