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// Copyright 2024 The Prometheus 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.
// This package no longer handles safe yaml parsing. In order to
// ensure correct yaml unmarshalling, use "yaml.UnmarshalStrict()".
package config
import (
"encoding/json"
"fmt"
"net/http"
"os"
"strings"
)
// ReservedHeaders that change the connection, are set by Prometheus, or can
// be changed otherwise.
var ReservedHeaders = map[string]struct{}{
"Authorization": {},
"Host": {},
"Content-Encoding": {},
"Content-Length": {},
"Content-Type": {},
"User-Agent": {},
"Connection": {},
"Keep-Alive": {},
"Proxy-Authenticate": {},
"Proxy-Authorization": {},
"Www-Authenticate": {},
"Accept-Encoding": {},
"X-Prometheus-Remote-Write-Version": {},
"X-Prometheus-Remote-Read-Version": {},
"X-Prometheus-Scrape-Timeout-Seconds": {},
// Added by SigV4.
"X-Amz-Date": {},
"X-Amz-Security-Token": {},
"X-Amz-Content-Sha256": {},
}
// Headers represents the configuration for HTTP headers.
type Headers struct {
Headers map[string]Header `yaml:",inline"`
}
func (h Headers) MarshalJSON() ([]byte, error) {
// Inline the Headers map when serializing JSON because json encoder doesn't support "inline" directive.
return json.Marshal(h.Headers)
}
// SetDirectory make headers file relative to the configuration file.
func (h *Headers) SetDirectory(dir string) {
if h == nil {
return
}
for _, h := range h.Headers {
h.SetDirectory(dir)
}
}
// Validate validates the Headers config.
func (h *Headers) Validate() error {
for n := range h.Headers {
if _, ok := ReservedHeaders[http.CanonicalHeaderKey(n)]; ok {
return fmt.Errorf("setting header %q is not allowed", http.CanonicalHeaderKey(n))
}
}
return nil
}
// Header represents the configuration for a single HTTP header.
type Header struct {
Values []string `yaml:"values,omitempty" json:"values,omitempty"`
Secrets []Secret `yaml:"secrets,omitempty" json:"secrets,omitempty"`
Files []string `yaml:"files,omitempty" json:"files,omitempty"`
}
// SetDirectory makes headers file relative to the configuration file.
func (h *Header) SetDirectory(dir string) {
for i := range h.Files {
h.Files[i] = JoinDir(dir, h.Files[i])
}
}
// NewHeadersRoundTripper returns a RoundTripper that sets HTTP headers on
// requests as configured.
func NewHeadersRoundTripper(config *Headers, next http.RoundTripper) http.RoundTripper {
if len(config.Headers) == 0 {
return next
}
return &headersRoundTripper{
config: config,
next: next,
}
}
type headersRoundTripper struct {
next http.RoundTripper
config *Headers
}
// RoundTrip implements http.RoundTripper.
func (rt *headersRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
req = cloneRequest(req)
for n, h := range rt.config.Headers {
for _, v := range h.Values {
req.Header.Add(n, v)
}
for _, v := range h.Secrets {
req.Header.Add(n, string(v))
}
for _, v := range h.Files {
b, err := os.ReadFile(v)
if err != nil {
return nil, fmt.Errorf("unable to read headers file %s: %w", v, err)
}
req.Header.Add(n, strings.TrimSpace(string(b)))
}
}
return rt.next.RoundTrip(req)
}
// CloseIdleConnections implements closeIdler.
func (rt *headersRoundTripper) CloseIdleConnections() {
if ci, ok := rt.next.(closeIdler); ok {
ci.CloseIdleConnections()
}
}
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