mirror of https://github.com/perkeep/perkeep.git
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package auth
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import (
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"encoding/base64"
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"fmt"
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"http"
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"os"
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"regexp"
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"strings"
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)
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var kBasicAuthPattern *regexp.Regexp = regexp.MustCompile(`^Basic ([a-zA-Z0-9\+/=]+)`)
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var AccessPassword string
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func TriedAuthorization(req *http.Request) bool {
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// Currently a simple test just using HTTP basic auth
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// (presumably over https); may expand.
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return req.Header.Get("Authorization") != ""
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}
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func SendUnauthorized(conn http.ResponseWriter) {
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realm := "camlistored"
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if pw := os.Getenv("CAMLI_ADVERTISED_PASSWORD"); pw != "" {
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realm = "Any username, password is: " + pw
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}
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conn.Header().Set("WWW-Authenticate", fmt.Sprintf("Basic realm=%q", realm))
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conn.WriteHeader(http.StatusUnauthorized)
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fmt.Fprintf(conn, "<h1>Unauthorized</h1>")
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}
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func IsAuthorized(req *http.Request) bool {
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auth := req.Header.Get("Authorization")
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if auth == "" {
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return false
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}
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matches := kBasicAuthPattern.FindStringSubmatch(auth)
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if len(matches) != 2 {
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return false
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}
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encoded := matches[1]
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enc := base64.StdEncoding
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decBuf := make([]byte, enc.DecodedLen(len(encoded)))
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n, err := enc.Decode(decBuf, []byte(encoded))
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if err != nil {
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return false
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}
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userpass := strings.SplitN(string(decBuf[0:n]), ":", 2)
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if len(userpass) != 2 {
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fmt.Println("didn't get two pieces")
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return false
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}
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password := userpass[1] // username at index 0 is currently unused
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return password != "" && password == AccessPassword
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}
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// requireAuth wraps a function with another function that enforces
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// HTTP Basic Auth.
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func RequireAuth(handler func(conn http.ResponseWriter, req *http.Request)) func(conn http.ResponseWriter, req *http.Request) {
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return func(conn http.ResponseWriter, req *http.Request) {
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if IsAuthorized(req) {
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handler(conn, req)
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} else {
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SendUnauthorized(conn)
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}
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}
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}
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