From 60fe10382a5eb4164dfdfeeeb4f65b2f4103c281 Mon Sep 17 00:00:00 2001
From: Chapuis Bertil <bchapuis@agimem.com>
Date: Sat, 19 Sep 2015 14:28:43 +0200
Subject: [PATCH] added htpasswd

---
 htpasswd.go | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 htpasswd.go

diff --git a/htpasswd.go b/htpasswd.go
new file mode 100644
index 0000000..d72a83c
--- /dev/null
+++ b/htpasswd.go
@@ -0,0 +1,84 @@
+package main
+
+/*
+Copied from: github.com/bitly/oauth2_proxy
+
+MIT License
+
+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.
+*/
+
+import (
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/csv"
+	"io"
+	"log"
+	"os"
+)
+
+// lookup passwords in a htpasswd file
+// The entries must have been created with -s for SHA encryption
+
+type HtpasswdFile struct {
+	Users map[string]string
+}
+
+func NewHtpasswdFromFile(path string) (*HtpasswdFile, error) {
+	r, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer r.Close()
+	return NewHtpasswd(r)
+}
+
+func NewHtpasswd(file io.Reader) (*HtpasswdFile, error) {
+	csv_reader := csv.NewReader(file)
+	csv_reader.Comma = ':'
+	csv_reader.Comment = '#'
+	csv_reader.TrimLeadingSpace = true
+
+	records, err := csv_reader.ReadAll()
+	if err != nil {
+		return nil, err
+	}
+	h := &HtpasswdFile{Users: make(map[string]string)}
+	for _, record := range records {
+		h.Users[record[0]] = record[1]
+	}
+	return h, nil
+}
+
+func (h *HtpasswdFile) Validate(user string, password string) bool {
+	realPassword, exists := h.Users[user]
+	if !exists {
+		return false
+	}
+	if realPassword[:5] == "{SHA}" {
+		d := sha1.New()
+		d.Write([]byte(password))
+		if realPassword[5:] == base64.StdEncoding.EncodeToString(d.Sum(nil)) {
+			return true
+		}
+	} else {
+		log.Printf("Invalid htpasswd entry for %s. Must be a SHA entry.", user)
+	}
+	return false
+}