70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package streamhandler
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import (
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"github.com/cloudflare/cloudflared/h2mux"
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"github.com/pkg/errors"
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)
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const (
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lbProbeUserAgentPrefix = "Mozilla/5.0 (compatible; Cloudflare-Traffic-Manager/1.0; +https://www.cloudflare.com/traffic-manager/;"
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)
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func FindCfRayHeader(h1 *http.Request) string {
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return h1.Header.Get("Cf-Ray")
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}
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func IsLBProbeRequest(req *http.Request) bool {
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return strings.HasPrefix(req.UserAgent(), lbProbeUserAgentPrefix)
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}
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func createRequest(stream *h2mux.MuxedStream, url *url.URL) (*http.Request, error) {
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req, err := http.NewRequest(http.MethodGet, url.String(), h2mux.MuxedStreamReader{MuxedStream: stream})
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if err != nil {
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return nil, errors.Wrap(err, "unexpected error from http.NewRequest")
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}
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err = H2RequestHeadersToH1Request(stream.Headers, req)
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if err != nil {
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return nil, errors.Wrap(err, "invalid request received")
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}
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return req, nil
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}
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func H2RequestHeadersToH1Request(h2 []h2mux.Header, h1 *http.Request) error {
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for _, header := range h2 {
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switch header.Name {
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case ":method":
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h1.Method = header.Value
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case ":scheme":
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case ":authority":
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// Otherwise the host header will be based on the origin URL
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h1.Host = header.Value
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case ":path":
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u, err := url.Parse(header.Value)
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if err != nil {
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return fmt.Errorf("unparseable path")
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}
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resolved := h1.URL.ResolveReference(u)
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// prevent escaping base URL
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if !strings.HasPrefix(resolved.String(), h1.URL.String()) {
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return fmt.Errorf("invalid path")
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}
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h1.URL = resolved
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case "content-length":
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contentLength, err := strconv.ParseInt(header.Value, 10, 64)
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if err != nil {
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return fmt.Errorf("unparseable content length")
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}
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h1.ContentLength = contentLength
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default:
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h1.Header.Add(http.CanonicalHeaderKey(header.Name), header.Value)
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}
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}
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return nil
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}
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