160 lines
4.2 KiB
Go
160 lines
4.2 KiB
Go
package acme
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"runtime"
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"strings"
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"time"
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)
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// UserAgent (if non-empty) will be tacked onto the User-Agent string in requests.
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var UserAgent string
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// HTTPClient is an HTTP client with a reasonable timeout value.
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var HTTPClient = http.Client{
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Transport: &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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Dial: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).Dial,
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TLSHandshakeTimeout: 15 * time.Second,
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ResponseHeaderTimeout: 15 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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},
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}
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const (
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// defaultGoUserAgent is the Go HTTP package user agent string. Too
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// bad it isn't exported. If it changes, we should update it here, too.
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defaultGoUserAgent = "Go-http-client/1.1"
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// ourUserAgent is the User-Agent of this underlying library package.
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ourUserAgent = "xenolf-acme"
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)
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// httpHead performs a HEAD request with a proper User-Agent string.
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// The response body (resp.Body) is already closed when this function returns.
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func httpHead(url string) (resp *http.Response, err error) {
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req, err := http.NewRequest("HEAD", url, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to head %q: %v", url, err)
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}
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req.Header.Set("User-Agent", userAgent())
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resp, err = HTTPClient.Do(req)
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if err != nil {
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return resp, fmt.Errorf("failed to do head %q: %v", url, err)
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}
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resp.Body.Close()
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return resp, err
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}
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// httpPost performs a POST request with a proper User-Agent string.
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// Callers should close resp.Body when done reading from it.
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func httpPost(url string, bodyType string, body io.Reader) (resp *http.Response, err error) {
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req, err := http.NewRequest("POST", url, body)
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if err != nil {
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return nil, fmt.Errorf("failed to post %q: %v", url, err)
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}
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req.Header.Set("Content-Type", bodyType)
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req.Header.Set("User-Agent", userAgent())
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return HTTPClient.Do(req)
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}
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// httpGet performs a GET request with a proper User-Agent string.
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// Callers should close resp.Body when done reading from it.
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func httpGet(url string) (resp *http.Response, err error) {
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to get %q: %v", url, err)
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}
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req.Header.Set("User-Agent", userAgent())
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return HTTPClient.Do(req)
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}
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// getJSON performs an HTTP GET request and parses the response body
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// as JSON, into the provided respBody object.
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func getJSON(uri string, respBody interface{}) (http.Header, error) {
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resp, err := httpGet(uri)
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if err != nil {
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return nil, fmt.Errorf("failed to get json %q: %v", uri, err)
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}
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defer resp.Body.Close()
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if resp.StatusCode >= http.StatusBadRequest {
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return resp.Header, handleHTTPError(resp)
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}
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return resp.Header, json.NewDecoder(resp.Body).Decode(respBody)
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}
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// postJSON performs an HTTP POST request and parses the response body
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// as JSON, into the provided respBody object.
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func postJSON(j *jws, uri string, reqBody, respBody interface{}) (http.Header, error) {
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jsonBytes, err := json.Marshal(reqBody)
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if err != nil {
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return nil, errors.New("Failed to marshal network message")
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}
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resp, err := j.post(uri, jsonBytes)
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if err != nil {
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return nil, fmt.Errorf("Failed to post JWS message. -> %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode >= http.StatusBadRequest {
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err := handleHTTPError(resp)
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switch err.(type) {
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case NonceError:
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// Retry once if the nonce was invalidated
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retryResp, err := j.post(uri, jsonBytes)
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if err != nil {
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return nil, fmt.Errorf("Failed to post JWS message. -> %v", err)
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}
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defer retryResp.Body.Close()
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if retryResp.StatusCode >= http.StatusBadRequest {
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return retryResp.Header, handleHTTPError(retryResp)
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}
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if respBody == nil {
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return retryResp.Header, nil
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}
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return retryResp.Header, json.NewDecoder(retryResp.Body).Decode(respBody)
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default:
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return resp.Header, err
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}
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}
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if respBody == nil {
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return resp.Header, nil
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}
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return resp.Header, json.NewDecoder(resp.Body).Decode(respBody)
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}
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// userAgent builds and returns the User-Agent string to use in requests.
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func userAgent() string {
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ua := fmt.Sprintf("%s (%s; %s) %s %s", defaultGoUserAgent, runtime.GOOS, runtime.GOARCH, ourUserAgent, UserAgent)
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return strings.TrimSpace(ua)
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}
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