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Merge pull request #416 from roidelapluie/headers
Add HTTP headers support to common HTTP client.
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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. | ||
|
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// This package no longer handles safe yaml parsing. In order to | ||
// ensure correct yaml unmarshalling, use "yaml.UnmarshalStrict()". | ||
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package config | ||
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import ( | ||
"fmt" | ||
"net/http" | ||
"os" | ||
"strings" | ||
) | ||
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// 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": {}, | ||
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// Added by SigV4. | ||
"X-Amz-Date": {}, | ||
"X-Amz-Security-Token": {}, | ||
"X-Amz-Content-Sha256": {}, | ||
} | ||
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// Headers represents the configuration for HTTP headers. | ||
type Headers struct { | ||
Headers map[string]Header `yaml:",inline" json:",inline"` | ||
dir string | ||
} | ||
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// Headers represents the configuration for HTTP headers. | ||
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"` | ||
} | ||
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// SetDirectory records the directory to make headers file relative to the | ||
// configuration file. | ||
func (h *Headers) SetDirectory(dir string) { | ||
if h == nil { | ||
return | ||
} | ||
h.dir = dir | ||
} | ||
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// Validate validates the Headers config. | ||
func (h *Headers) Validate() error { | ||
for n, header := range h.Headers { | ||
if _, ok := reservedHeaders[http.CanonicalHeaderKey(n)]; ok { | ||
return fmt.Errorf("setting header %q is not allowed", http.CanonicalHeaderKey(n)) | ||
} | ||
for _, v := range header.Files { | ||
f := JoinDir(h.dir, v) | ||
_, err := os.ReadFile(f) | ||
if err != nil { | ||
return fmt.Errorf("unable to read header %q from file %s: %w", http.CanonicalHeaderKey(n), f, err) | ||
} | ||
} | ||
} | ||
return nil | ||
} | ||
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// 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, | ||
} | ||
} | ||
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type headersRoundTripper struct { | ||
next http.RoundTripper | ||
config *Headers | ||
} | ||
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// 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 { | ||
f := JoinDir(rt.config.dir, v) | ||
b, err := os.ReadFile(f) | ||
if err != nil { | ||
return nil, fmt.Errorf("unable to read headers file %s: %w", f, err) | ||
} | ||
req.Header.Add(n, strings.TrimSpace(string(b))) | ||
} | ||
} | ||
return rt.next.RoundTrip(req) | ||
} | ||
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// CloseIdleConnections implements closeIdler. | ||
func (rt *headersRoundTripper) CloseIdleConnections() { | ||
if ci, ok := rt.next.(closeIdler); ok { | ||
ci.CloseIdleConnections() | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,31 @@ | ||
// 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()". | ||
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package config | ||
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import ( | ||
"net/http" | ||
"testing" | ||
) | ||
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func TestReservedHeaders(t *testing.T) { | ||
for k := range reservedHeaders { | ||
l := http.CanonicalHeaderKey(k) | ||
if k != l { | ||
t.Errorf("reservedHeaders keys should be lowercase: got %q, expected %q", k, http.CanonicalHeaderKey(k)) | ||
} | ||
} | ||
} |
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