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http.go
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http.go
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package http
import (
"fmt"
"io"
"net/http"
"net/url"
"time"
"github.com/smartcontractkit/chainlink/core/logger"
)
type httpClientConfig interface {
DatabaseURL() url.URL
}
// NewRestrictedHTTPClient returns a secure HTTP Client (queries to certain
// local addresses are blocked)
func NewRestrictedHTTPClient(cfg httpClientConfig, lggr logger.Logger) *http.Client {
tr := newDefaultTransport()
tr.DialContext = makeRestrictedDialContext(cfg, lggr)
return &http.Client{Transport: tr}
}
// NewUnrestrictedClient returns a HTTP Client with no Transport restrictions
func NewUnrestrictedHTTPClient() *http.Client {
unrestrictedTr := newDefaultTransport()
return &http.Client{Transport: unrestrictedTr}
}
func newDefaultTransport() *http.Transport {
t := http.DefaultTransport.(*http.Transport).Clone()
// There are certain classes of vulnerabilities that open up when
// compression is enabled. For simplicity, we disable compression
// to cut off this class of attacks.
// https://www.cyberis.co.uk/2013/08/vulnerabilities-that-just-wont-die.html
t.DisableCompression = true
return t
}
// HTTPRequest holds the request and config struct for a http request
type HTTPRequest struct {
Client *http.Client
Request *http.Request
Config HTTPRequestConfig
Logger logger.Logger
}
// HTTPRequestConfig holds the configurable settings for a http request
type HTTPRequestConfig struct {
SizeLimit int64
}
// SendRequest sends a HTTPRequest,
// returns a body, status code, and error.
func (h *HTTPRequest) SendRequest() (responseBody []byte, statusCode int, headers http.Header, err error) {
start := time.Now()
r, err := h.Client.Do(h.Request)
if err != nil {
h.Logger.Warnw("http adapter got error", "error", err)
return nil, 0, nil, err
}
defer h.Logger.ErrorIfClosing(r.Body, "SendRequest response body")
statusCode = r.StatusCode
elapsed := time.Since(start)
h.Logger.Debugw(fmt.Sprintf("http adapter got %v in %s", statusCode, elapsed), "statusCode", statusCode, "timeElapsedSeconds", elapsed)
source := http.MaxBytesReader(nil, r.Body, h.Config.SizeLimit)
bytes, err := io.ReadAll(source)
if err != nil {
h.Logger.Errorw("http adapter error reading body", "error", err)
return nil, statusCode, nil, err
}
elapsed = time.Since(start)
h.Logger.Debugw(fmt.Sprintf("http adapter finished after %s", elapsed), "statusCode", statusCode, "timeElapsedSeconds", elapsed)
responseBody = bytes
return responseBody, statusCode, r.Header, nil
}