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http.go
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http.go
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// 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 nvd
import (
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"regexp"
)
var userAgent = "nvdsync-" + Version
// http helpers
func httpNewRequestContext(ctx context.Context, method, path string) (*http.Request, error) {
req, err := http.NewRequest(method, path, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", UserAgent())
return req.WithContext(ctx), nil
}
func httpResponseNotOK(resp *http.Response) error {
if resp.StatusCode == http.StatusOK {
return nil
}
body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 4*1024))
if err != nil {
return err
}
return fmt.Errorf("unexpected http response from %q (%q): %q",
resp.Request.URL.String(), resp.Status, string(body))
}
// SetUserAgent sets the value of User-Agent HTTP header for the client
func SetUserAgent(ua string) error {
if !regexp.MustCompile("^[[:ascii:]]+$").MatchString(ua) {
return fmt.Errorf("non-ascii character in User-Agent header: %q", ua)
}
userAgent = ua
return nil
}
// UserAgent returns the value of User-Agent HTTP header used by the client
func UserAgent() string {
return userAgent
}