github.com/stolowski/snapd@v0.0.0-20210407085831-115137ce5a22/store/uacontext.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2019 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package store
    21  
    22  import (
    23  	"context"
    24  	"net/http"
    25  )
    26  
    27  type userAgentContextKey struct{}
    28  
    29  // ClientUserAgentContext carries the client user agent that talks to snapd
    30  func WithClientUserAgent(parent context.Context, req *http.Request) context.Context {
    31  	ua := req.Header.Get("User-Agent")
    32  	return context.WithValue(parent, userAgentContextKey{}, ua)
    33  }
    34  
    35  // ClientUserAgent returns the user agent of the client that talks to snapd
    36  func ClientUserAgent(ctx context.Context) string {
    37  	ua, ok := ctx.Value(userAgentContextKey{}).(string)
    38  	if ok {
    39  		return ua
    40  	}
    41  	return ""
    42  }