From 9c2ad91230d72fe6d661450cc78300ea223ae2bc Mon Sep 17 00:00:00 2001
From: Vidhu Kant Sharma <bokuwakanojogahoshii@yahoo.com>
Date: Mon, 19 Oct 2020 11:05:36 +0530
Subject: make it better

---
 vendor/github.com/gin-gonic/gin/auth.go | 98 +++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 vendor/github.com/gin-gonic/gin/auth.go

(limited to 'vendor/github.com/gin-gonic/gin/auth.go')

diff --git a/vendor/github.com/gin-gonic/gin/auth.go b/vendor/github.com/gin-gonic/gin/auth.go
new file mode 100644
index 0000000..33f8e9a
--- /dev/null
+++ b/vendor/github.com/gin-gonic/gin/auth.go
@@ -0,0 +1,98 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"crypto/subtle"
+	"encoding/base64"
+	"strconv"
+)
+
+const (
+	AuthUserKey = "user"
+)
+
+type (
+	Accounts map[string]string
+	authPair struct {
+		Value string
+		User  string
+	}
+	authPairs []authPair
+)
+
+func (a authPairs) searchCredential(authValue string) (string, bool) {
+	if len(authValue) == 0 {
+		return "", false
+	}
+	for _, pair := range a {
+		if pair.Value == authValue {
+			return pair.User, true
+		}
+	}
+	return "", false
+}
+
+// Implements a basic Basic HTTP Authorization. It takes as arguments a map[string]string where
+// the key is the user name and the value is the password, as well as the name of the Realm
+// (see http://tools.ietf.org/html/rfc2617#section-1.2)
+func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc {
+	if realm == "" {
+		realm = "Authorization Required"
+	}
+	realm = "Basic realm=" + strconv.Quote(realm)
+	pairs := processAccounts(accounts)
+	return func(c *Context) {
+		// Search user in the slice of allowed credentials
+		user, found := pairs.searchCredential(c.Request.Header.Get("Authorization"))
+		if !found {
+			// Credentials doesn't match, we return 401 and abort handlers chain.
+			c.Header("WWW-Authenticate", realm)
+			c.AbortWithStatus(401)
+		} else {
+			// The user credentials was found, set user's id to key AuthUserKey in this context, the userId can be read later using
+			// c.MustGet(gin.AuthUserKey)
+			c.Set(AuthUserKey, user)
+		}
+	}
+}
+
+// Implements a basic Basic HTTP Authorization. It takes as argument a map[string]string where
+// the key is the user name and the value is the password.
+func BasicAuth(accounts Accounts) HandlerFunc {
+	return BasicAuthForRealm(accounts, "")
+}
+
+func processAccounts(accounts Accounts) authPairs {
+	if len(accounts) == 0 {
+		panic("Empty list of authorized credentials")
+	}
+	pairs := make(authPairs, 0, len(accounts))
+	for user, password := range accounts {
+		if len(user) == 0 {
+			panic("User can not be empty")
+		}
+		value := authorizationHeader(user, password)
+		pairs = append(pairs, authPair{
+			Value: value,
+			User:  user,
+		})
+	}
+	return pairs
+}
+
+func authorizationHeader(user, password string) string {
+	base := user + ":" + password
+	return "Basic " + base64.StdEncoding.EncodeToString([]byte(base))
+}
+
+func secureCompare(given, actual string) bool {
+	if subtle.ConstantTimeEq(int32(len(given)), int32(len(actual))) == 1 {
+		return subtle.ConstantTimeCompare([]byte(given), []byte(actual)) == 1
+	} else {
+		/* Securely compare actual to itself to keep constant time, but always return false */
+		return subtle.ConstantTimeCompare([]byte(actual), []byte(actual)) == 1 && false
+	}
+}
-- 
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