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// Package api provides internal APIs for gitlab-workhorse.
package api
import (
"crypto/tls"
"crypto/x509"
"fmt"
"net/http"
"net/url"
"github.com/gorilla/websocket"
"gitlab.com/gitlab-org/labkit/log"
)
// ChannelSettings holds the configuration settings for establishing a websocket channel.
type ChannelSettings struct {
// The channel provider may require use of a particular subprotocol. If so,
// it must be specified here, and Workhorse must have a matching codec.
Subprotocols []string
// The websocket URL to connect to.
Url string //nolint:revive,stylecheck // when JSON decoding, the value is provided via 'url'
// Any headers (e.g., Authorization) to send with the websocket request
Header http.Header
// The CA roots to validate the remote endpoint with, for wss:// URLs. The
// system-provided CA pool will be used if this is blank. PEM-encoded data.
CAPem string
// The value is specified in seconds. It is converted to time.Duration
// later.
MaxSessionTime int
}
// URL parses the websocket URL in the ChannelSettings and returns a *url.URL.
func (t *ChannelSettings) URL() (*url.URL, error) {
return url.Parse(t.Url)
}
// Dialer returns a websocket Dialer configured with the settings from ChannelSettings.
func (t *ChannelSettings) Dialer() *websocket.Dialer {
dialer := &websocket.Dialer{
Subprotocols: t.Subprotocols,
}
pool, err := x509.SystemCertPool()
if err != nil {
log.WithError(err).Print("failed to load system cert pool")
pool = x509.NewCertPool()
}
if len(t.CAPem) > 0 {
pool.AppendCertsFromPEM([]byte(t.CAPem))
}
dialer.TLSClientConfig = &tls.Config{RootCAs: pool}
return dialer
}
// Clone creates and returns a deep copy of the ChannelSettings instance.
func (t *ChannelSettings) Clone() *ChannelSettings {
// Doesn't clone the strings, but that's OK as strings are immutable in go
cloned := *t
cloned.Header = t.Header.Clone()
if cloned.Header == nil {
cloned.Header = make(http.Header)
}
return &cloned
}
// Dial establishes a websocket connection using the settings from ChannelSettings.
// It returns a websocket connection, an HTTP response, and an error if any.
func (t *ChannelSettings) Dial() (*websocket.Conn, *http.Response, error) {
return t.Dialer().Dial(t.Url, t.Header)
}
// Validate checks if the ChannelSettings instance is valid.
func (t *ChannelSettings) Validate() error {
if t == nil {
return fmt.Errorf("channel details not specified")
}
if len(t.Subprotocols) == 0 {
return fmt.Errorf("no subprotocol specified")
}
parsedURL, err := t.URL()
if err != nil {
return fmt.Errorf("invalid URL")
}
if parsedURL.Scheme != "ws" && parsedURL.Scheme != "wss" {
return fmt.Errorf("invalid websocket scheme: %q", parsedURL.Scheme)
}
return nil
}
// IsEqual compares the current ChannelSettings with another ChannelSettings instance.
// It returns true if both instances are equal (or both nil), otherwise false.
func (t *ChannelSettings) IsEqual(other *ChannelSettings) bool {
if t == nil && other == nil {
return true
}
if t == nil || other == nil {
return false
}
if len(t.Subprotocols) != len(other.Subprotocols) {
return false
}
for i, subprotocol := range t.Subprotocols {
if other.Subprotocols[i] != subprotocol {
return false
}
}
if len(t.Header) != len(other.Header) {
return false
}
for header, values := range t.Header {
if len(values) != len(other.Header[header]) {
return false
}
for i, value := range values {
if other.Header[header][i] != value {
return false
}
}
}
return t.Url == other.Url &&
t.CAPem == other.CAPem &&
t.MaxSessionTime == other.MaxSessionTime
}
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