-
Notifications
You must be signed in to change notification settings - Fork 0
/
proxy.go
216 lines (187 loc) · 4.9 KB
/
proxy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
package server
import (
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"errors"
"fmt"
"io"
"log"
"net/http"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/ds-vologdin/otus-software-architect/task06/app/auth-sidecar/config"
)
const (
TokenTypeAccess = "access"
TokenTypeAccessTTL = time.Duration(15 * time.Minute)
)
var (
DefaultHTTPRequestTimeout = 1 * time.Second
ErrUnauthorized = errors.New("unauthorized request")
ErrForbidden = errors.New("forbidden request")
)
type proxyServer struct {
PublicKey *rsa.PublicKey
Target string
ExcludeAuth []config.Request
}
type ParsedToken struct {
UID string
Type string
ExpiresOn int64
}
func (p proxyServer) Proxy(w http.ResponseWriter, r *http.Request) {
log.Println(r.RemoteAddr, " ", r.Method, " ", r.URL)
var userID string
if isNeedAuth(p.ExcludeAuth, r) {
parsedToken, err := auth(p.PublicKey, r)
if err != nil {
switch err {
case ErrUnauthorized:
http.Error(w, err.Error(), http.StatusUnauthorized)
return
case ErrForbidden:
http.Error(w, err.Error(), http.StatusForbidden)
return
default:
http.Error(w, "internal error", http.StatusInternalServerError)
return
}
}
userID = parsedToken.UID
}
client := &http.Client{
Timeout: DefaultHTTPRequestTimeout,
}
url := fmt.Sprintf("%s%s", p.Target, r.URL.Path)
log.Printf("%v %v", r.Method, url)
req, err := http.NewRequest(r.Method, url, r.Body)
copyHeader(req.Header, r.Header)
if userID != "" {
req.Header.Set("X-User-Id", userID)
}
resp, err := client.Do(req)
if err != nil {
log.Printf("request: %v", err)
http.Error(w, "internal error", http.StatusInternalServerError)
return
}
copyHeader(w.Header(), resp.Header)
w.WriteHeader(resp.StatusCode)
io.Copy(w, resp.Body)
}
func auth(key *rsa.PublicKey, r *http.Request) (ParsedToken, error) {
var parsedToken ParsedToken
token := r.Header.Get("Authorization")
if token == "" {
log.Print("request without Authorization header field")
return parsedToken, ErrUnauthorized
}
if strings.HasPrefix(token, "Bearer ") {
token = token[7:]
}
log.Printf("token: %v", token)
parsedToken, err := parseToken(key, token)
if err != nil {
log.Print(err)
return parsedToken, ErrForbidden
}
log.Printf("parsed: %v", parsedToken)
if err = checkParsedAccessToken(parsedToken); err != nil {
log.Printf("invalid token: %v", err)
return parsedToken, ErrForbidden
}
return parsedToken, nil
}
func isNeedAuth(exclude []config.Request, r *http.Request) bool {
for _, request := range exclude {
if request.Path != r.URL.Path {
continue
}
if request.Method == r.Method {
return false
}
}
return true
}
func NewProxy(cfg config.Config) (proxyServer, error) {
p := proxyServer{}
if cfg.JWT.Algorithm != "RS256" {
return p, fmt.Errorf("'%s' is not supported jwt algorithm, support only RS256", cfg.JWT.Algorithm)
}
publicKeyRaw, err := base64.StdEncoding.DecodeString(cfg.JWT.PublicKey)
if err != nil {
log.Printf("invalid jwt public key: %v", err)
return p, err
}
publicKey, err := x509.ParsePKCS1PublicKey(publicKeyRaw)
if err != nil {
log.Printf("invalid jwt public key: %v", err)
return p, err
}
p.PublicKey = publicKey
target := cfg.Target.URL
targetLength := len(target)
if strings.HasSuffix(target, "/") {
target = target[:targetLength-1]
}
p.Target = target
p.ExcludeAuth = cfg.ExcludeAuth
return p, nil
}
func parseToken(publicKey *rsa.PublicKey, tokenString string) (ParsedToken, error) {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return publicKey, nil
})
parsedToken := ParsedToken{}
if err != nil {
log.Printf("invalid token: %v", token)
return parsedToken, fmt.Errorf("invalid token: %w", err)
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok || !token.Valid {
log.Printf("refresh token: %v", token)
return parsedToken, fmt.Errorf("invalid token")
}
v := claims["uid"]
if uid, ok := v.(string); ok {
parsedToken.UID = uid
}
v = claims["type"]
if tokenType, ok := v.(string); ok {
parsedToken.Type = tokenType
}
v = claims["exp"]
if exp, ok := v.(int64); ok {
parsedToken.ExpiresOn = exp
}
return parsedToken, nil
}
func checkParsedAccessToken(token ParsedToken) error {
if token.Type != TokenTypeAccess {
return fmt.Errorf("invalid type of token: want '%v', got '%v'", TokenTypeAccess, token.Type)
}
if token.UID == "" {
return fmt.Errorf("token has not uid")
}
if token.ExpiresOn > time.Now().Unix() {
return fmt.Errorf("token is expired")
}
return nil
}
func authorizeError(w http.ResponseWriter) {
w.Header().Set("WWW-Authenticate", "Bearer")
http.Error(w, "authorization failed", http.StatusUnauthorized)
}
func copyHeader(dst, src http.Header) {
for k, vv := range src {
for _, v := range vv {
dst.Set(k, v)
}
}
}