github.com/hms58/moby@v1.13.1/api/server/middleware/debug.go (about)

     1  package middleware
     2  
     3  import (
     4  	"bufio"
     5  	"encoding/json"
     6  	"io"
     7  	"net/http"
     8  	"strings"
     9  
    10  	"github.com/Sirupsen/logrus"
    11  	"github.com/docker/docker/api/server/httputils"
    12  	"github.com/docker/docker/pkg/ioutils"
    13  	"golang.org/x/net/context"
    14  )
    15  
    16  // DebugRequestMiddleware dumps the request to logger
    17  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 {
    18  	return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    19  		logrus.Debugf("Calling %s %s", r.Method, r.RequestURI)
    20  
    21  		if r.Method != "POST" {
    22  			return handler(ctx, w, r, vars)
    23  		}
    24  		if err := httputils.CheckForJSON(r); err != nil {
    25  			return handler(ctx, w, r, vars)
    26  		}
    27  		maxBodySize := 4096 // 4KB
    28  		if r.ContentLength > int64(maxBodySize) {
    29  			return handler(ctx, w, r, vars)
    30  		}
    31  
    32  		body := r.Body
    33  		bufReader := bufio.NewReaderSize(body, maxBodySize)
    34  		r.Body = ioutils.NewReadCloserWrapper(bufReader, func() error { return body.Close() })
    35  
    36  		b, err := bufReader.Peek(maxBodySize)
    37  		if err != io.EOF {
    38  			// either there was an error reading, or the buffer is full (in which case the request is too large)
    39  			return handler(ctx, w, r, vars)
    40  		}
    41  
    42  		var postForm map[string]interface{}
    43  		if err := json.Unmarshal(b, &postForm); err == nil {
    44  			maskSecretKeys(postForm)
    45  			formStr, errMarshal := json.Marshal(postForm)
    46  			if errMarshal == nil {
    47  				logrus.Debugf("form data: %s", string(formStr))
    48  			} else {
    49  				logrus.Debugf("form data: %q", postForm)
    50  			}
    51  		}
    52  
    53  		return handler(ctx, w, r, vars)
    54  	}
    55  }
    56  
    57  func maskSecretKeys(inp interface{}) {
    58  	if arr, ok := inp.([]interface{}); ok {
    59  		for _, f := range arr {
    60  			maskSecretKeys(f)
    61  		}
    62  		return
    63  	}
    64  	if form, ok := inp.(map[string]interface{}); ok {
    65  	loop0:
    66  		for k, v := range form {
    67  			for _, m := range []string{"password", "secret", "jointoken", "unlockkey"} {
    68  				if strings.EqualFold(m, k) {
    69  					form[k] = "*****"
    70  					continue loop0
    71  				}
    72  			}
    73  			maskSecretKeys(v)
    74  		}
    75  	}
    76  }