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// Copyright 2015 Matthew Holt and The Caddy 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 caddyconfig
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"net/http"
"os"
"time"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(HTTPLoader{})
}
// HTTPLoader can load Caddy configs over HTTP(S). It can adapt the config
// based on the Content-Type header of the HTTP response.
type HTTPLoader struct {
// The method for the request. Default: GET
Method string `json:"method,omitempty"`
// The URL of the request.
URL string `json:"url,omitempty"`
// HTTP headers to add to the request.
Headers http.Header `json:"header,omitempty"`
// Maximum time allowed for a complete connection and request.
Timeout caddy.Duration `json:"timeout,omitempty"`
TLS *struct {
// Present this instance's managed remote identity credentials to the server.
UseServerIdentity bool `json:"use_server_identity,omitempty"`
// PEM-encoded client certificate filename to present to the server.
ClientCertificateFile string `json:"client_certificate_file,omitempty"`
// PEM-encoded key to use with the client certificate.
ClientCertificateKeyFile string `json:"client_certificate_key_file,omitempty"`
// List of PEM-encoded CA certificate files to add to the same trust
// store as RootCAPool (or root_ca_pool in the JSON).
RootCAPEMFiles []string `json:"root_ca_pem_files,omitempty"`
} `json:"tls,omitempty"`
}
// CaddyModule returns the Caddy module information.
func (HTTPLoader) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "caddy.config_loaders.http",
New: func() caddy.Module { return new(HTTPLoader) },
}
}
// LoadConfig loads a Caddy config.
func (hl HTTPLoader) LoadConfig(ctx caddy.Context) ([]byte, error) {
client, err := hl.makeClient(ctx)
if err != nil {
return nil, err
}
method := hl.Method
if method == "" {
method = http.MethodGet
}
req, err := http.NewRequest(method, hl.URL, nil)
if err != nil {
return nil, err
}
req.Header = hl.Headers
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("server responded with HTTP %d", resp.StatusCode)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
result, warnings, err := adaptByContentType(resp.Header.Get("Content-Type"), body)
if err != nil {
return nil, err
}
for _, warn := range warnings {
ctx.Logger(hl).Warn(warn.String())
}
return result, nil
}
func (hl HTTPLoader) makeClient(ctx caddy.Context) (*http.Client, error) {
client := &http.Client{
Timeout: time.Duration(hl.Timeout),
}
if hl.TLS != nil {
var tlsConfig *tls.Config
// client authentication
if hl.TLS.UseServerIdentity {
certs, err := ctx.IdentityCredentials(ctx.Logger(hl))
if err != nil {
return nil, fmt.Errorf("getting server identity credentials: %v", err)
}
if tlsConfig == nil {
tlsConfig = new(tls.Config)
}
tlsConfig.Certificates = certs
} else if hl.TLS.ClientCertificateFile != "" && hl.TLS.ClientCertificateKeyFile != "" {
cert, err := tls.LoadX509KeyPair(hl.TLS.ClientCertificateFile, hl.TLS.ClientCertificateKeyFile)
if err != nil {
return nil, err
}
if tlsConfig == nil {
tlsConfig = new(tls.Config)
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
// trusted server certs
if len(hl.TLS.RootCAPEMFiles) > 0 {
rootPool := x509.NewCertPool()
for _, pemFile := range hl.TLS.RootCAPEMFiles {
pemData, err := os.ReadFile(pemFile)
if err != nil {
return nil, fmt.Errorf("failed reading ca cert: %v", err)
}
rootPool.AppendCertsFromPEM(pemData)
}
if tlsConfig == nil {
tlsConfig = new(tls.Config)
}
tlsConfig.RootCAs = rootPool
}
client.Transport = &http.Transport{TLSClientConfig: tlsConfig}
}
return client, nil
}
var _ caddy.ConfigLoader = (*HTTPLoader)(nil)
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