/
middleware.go
71 lines (62 loc) · 1.72 KB
/
middleware.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
package middleware
import (
"fmt"
"net/http"
"time"
"github.com/labstack/echo/v4"
"golang.org/x/time/rate"
awsv4 "github.com/LukeEuler/echo-awsv4/aws/v4"
)
type AwsV4Config struct {
Region, Name string
AwsCheckHandler func(c echo.Context, err error)
RateCheckHandler func(c echo.Context, err error)
keys map[string]string
limiters map[string]*rate.Limiter
}
func (c *AwsV4Config) AddKey(accessKey, secretKey string, duration time.Duration, times int) error {
if len(c.keys) == 0 {
c.keys = make(map[string]string, 10)
c.limiters = make(map[string]*rate.Limiter, 10)
}
_, ok := c.keys[accessKey]
if ok {
return fmt.Errorf("repeated key: %s", accessKey)
}
c.keys[accessKey] = secretKey
c.limiters[accessKey] = rate.NewLimiter(rate.Every(duration), times)
return nil
}
func DefaultAwsV4ContextHandler(c echo.Context, err error) {
_ = c.String(http.StatusBadRequest, err.Error())
}
func AwsV4(conf AwsV4Config) echo.MiddlewareFunc {
if conf.AwsCheckHandler == nil {
conf.AwsCheckHandler = DefaultAwsV4ContextHandler
}
if conf.RateCheckHandler == nil {
conf.RateCheckHandler = DefaultAwsV4ContextHandler
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
auth, _, err := awsv4.CheckRequestWithAwsV4KeyMaps(c.Request(), conf.keys, conf.Region, conf.Name)
if err != nil {
conf.AwsCheckHandler(c, err)
return err
}
limiter := conf.limiters[auth.AccessKeyID]
allow := limiter.Allow()
if !allow {
ll := limiter.Limit()
fmt.Println(ll)
err := fmt.Errorf("match rate limit. key: %s", auth.AccessKeyID)
conf.RateCheckHandler(c, err)
return err
}
if err = next(c); err != nil {
c.Error(err)
}
return err
}
}
}