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package middleware // import "github.com/docker/docker/api/server/middleware"
import (
"bufio"
"context"
"encoding/json"
"io"
"net/http"
"strings"
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/pkg/ioutils"
"github.com/sirupsen/logrus"
)
// DebugRequestMiddleware dumps the request to logger
func DebugRequestMiddleware(handler func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error) func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
logrus.Debugf("Calling %s %s", r.Method, r.RequestURI)
if r.Method != http.MethodPost {
return handler(ctx, w, r, vars)
}
if err := httputils.CheckForJSON(r); err != nil {
return handler(ctx, w, r, vars)
}
maxBodySize := 4096 // 4KB
if r.ContentLength > int64(maxBodySize) {
return handler(ctx, w, r, vars)
}
body := r.Body
bufReader := bufio.NewReaderSize(body, maxBodySize)
r.Body = ioutils.NewReadCloserWrapper(bufReader, func() error { return body.Close() })
b, err := bufReader.Peek(maxBodySize)
if err != io.EOF {
// either there was an error reading, or the buffer is full (in which case the request is too large)
return handler(ctx, w, r, vars)
}
var postForm map[string]interface{}
if err := json.Unmarshal(b, &postForm); err == nil {
maskSecretKeys(postForm)
formStr, errMarshal := json.Marshal(postForm)
if errMarshal == nil {
logrus.Debugf("form data: %s", string(formStr))
} else {
logrus.Debugf("form data: %q", postForm)
}
}
return handler(ctx, w, r, vars)
}
}
func maskSecretKeys(inp interface{}) {
if arr, ok := inp.([]interface{}); ok {
for _, f := range arr {
maskSecretKeys(f)
}
return
}
if form, ok := inp.(map[string]interface{}); ok {
scrub := []string{
// Note: The Data field contains the base64-encoded secret in 'secret'
// and 'config' create and update requests. Currently, no other POST
// API endpoints use a data field, so we scrub this field unconditionally.
// Change this handling to be conditional if a new endpoint is added
// in future where this field should not be scrubbed.
"data",
"jointoken",
"password",
"secret",
"signingcakey",
"unlockkey",
}
loop0:
for k, v := range form {
for _, m := range scrub {
if strings.EqualFold(m, k) {
form[k] = "*****"
continue loop0
}
}
maskSecretKeys(v)
}
}
}
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