2018-09-04 20:51:42 +00:00
|
|
|
// Copyright 2017 clair authors
|
|
|
|
//
|
|
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
|
|
// you may not use this file except in compliance with the License.
|
|
|
|
// You may obtain a copy of the License at
|
|
|
|
//
|
|
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
//
|
|
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
|
|
// See the License for the specific language governing permissions and
|
|
|
|
// limitations under the License.
|
|
|
|
|
|
|
|
// Package httputil implements common HTTP functionality used throughout the Clair codebase.
|
|
|
|
package httputil
|
|
|
|
|
|
|
|
import (
|
2019-02-20 22:14:51 +00:00
|
|
|
"context"
|
|
|
|
"crypto/tls"
|
|
|
|
"fmt"
|
|
|
|
"io"
|
2018-09-04 20:51:42 +00:00
|
|
|
"net"
|
|
|
|
"net/http"
|
|
|
|
"strings"
|
|
|
|
|
|
|
|
"github.com/coreos/clair/pkg/version"
|
|
|
|
)
|
|
|
|
|
2018-09-11 02:49:24 +00:00
|
|
|
// Middleware is a function used to wrap the logic of another http.Handler.
|
|
|
|
type Middleware func(http.Handler) http.Handler
|
|
|
|
|
2018-09-04 20:51:42 +00:00
|
|
|
// GetWithUserAgent performs an HTTP GET with the proper Clair User-Agent.
|
|
|
|
func GetWithUserAgent(url string) (*http.Response, error) {
|
|
|
|
client := &http.Client{}
|
|
|
|
|
|
|
|
req, err := http.NewRequest("GET", url, nil)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
req.Header.Set("User-Agent", "Clair/"+version.Version+" (https://github.com/coreos/clair)")
|
|
|
|
|
|
|
|
resp, err := client.Do(req)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return resp, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// GetClientAddr returns the first value in X-Forwarded-For if it exists
|
|
|
|
// otherwise fall back to use RemoteAddr
|
|
|
|
func GetClientAddr(r *http.Request) string {
|
|
|
|
addr := r.RemoteAddr
|
|
|
|
if s := r.Header.Get("X-Forwarded-For"); s != "" {
|
|
|
|
ips := strings.Split(s, ",")
|
|
|
|
// assume the first one is the client address
|
|
|
|
if len(ips) != 0 {
|
|
|
|
// validate the ip
|
|
|
|
if realIP := net.ParseIP(ips[0]); realIP != nil {
|
|
|
|
addr = strings.TrimSpace(ips[0])
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return addr
|
|
|
|
}
|
|
|
|
|
2019-02-20 22:14:51 +00:00
|
|
|
// GetWithContext do HTTP GET to the URI with headers and returns response blob
|
|
|
|
// reader.
|
|
|
|
func GetWithContext(ctx context.Context, uri string, headers http.Header) (io.ReadCloser, error) {
|
|
|
|
request, err := http.NewRequest("GET", uri, nil)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
if headers != nil {
|
|
|
|
request.Header = headers
|
|
|
|
}
|
|
|
|
|
|
|
|
tr := &http.Transport{
|
|
|
|
TLSClientConfig: &tls.Config{},
|
|
|
|
Proxy: http.ProxyFromEnvironment,
|
|
|
|
}
|
|
|
|
|
|
|
|
client := &http.Client{Transport: tr}
|
|
|
|
request = request.WithContext(ctx)
|
|
|
|
r, err := client.Do(request)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
// Fail if we don't receive a 2xx HTTP status code.
|
|
|
|
if !Status2xx(r) {
|
|
|
|
return nil, fmt.Errorf("failed HTTP GET: expected 2XX, got %d", r.StatusCode)
|
|
|
|
}
|
|
|
|
|
|
|
|
return r.Body, nil
|
|
|
|
}
|
|
|
|
|
2018-09-04 20:51:42 +00:00
|
|
|
// Status2xx returns true if the response's status code is success (2xx)
|
|
|
|
func Status2xx(resp *http.Response) bool {
|
|
|
|
return resp.StatusCode/100 == 2
|
|
|
|
}
|