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github_webhooks.go
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github_webhooks.go
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package github
import (
"crypto/hmac"
"crypto/sha1" //nolint:gosec // G505
"encoding/hex"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"github.com/circonus-labs/circonus-unified-agent/cua"
"github.com/gorilla/mux"
)
type Webhook struct {
Path string
Secret string
acc cua.Accumulator
}
func (gh *Webhook) Register(router *mux.Router, acc cua.Accumulator) {
router.HandleFunc(gh.Path, gh.eventHandler).Methods("POST")
log.Printf("I! Started the webhooks_github on %s\n", gh.Path)
gh.acc = acc
}
func (gh *Webhook) eventHandler(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
eventType := r.Header.Get("X-Github-Event")
data, err := io.ReadAll(r.Body)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
if gh.Secret != "" && !checkSignature(gh.Secret, data, r.Header.Get("X-Hub-Signature")) {
log.Printf("E! Fail to check the github webhook signature\n")
w.WriteHeader(http.StatusBadRequest)
return
}
e, err := NewEvent(data, eventType)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
if e != nil {
p := e.NewMetric()
gh.acc.AddFields("github_webhooks", p.Fields(), p.Tags(), p.Time())
}
w.WriteHeader(http.StatusOK)
}
func generateEvent(data []byte, event Event) (Event, error) {
err := json.Unmarshal(data, event)
if err != nil {
return nil, fmt.Errorf("json unmarshal: %w", err)
}
return event, nil
}
type newEventError struct {
s string
}
func (e *newEventError) Error() string {
return e.s
}
func NewEvent(data []byte, name string) (Event, error) {
log.Printf("D! New %v event received", name)
switch name {
case "commit_comment":
return generateEvent(data, &CommitCommentEvent{})
case "create":
return generateEvent(data, &CreateEvent{})
case "delete": //nolint:goconst
return generateEvent(data, &DeleteEvent{})
case "deployment":
return generateEvent(data, &DeploymentEvent{})
case "deployment_status":
return generateEvent(data, &DeploymentStatusEvent{})
case "fork":
return generateEvent(data, &ForkEvent{})
case "gollum":
return generateEvent(data, &GollumEvent{})
case "issue_comment":
return generateEvent(data, &IssueCommentEvent{})
case "issues":
return generateEvent(data, &IssuesEvent{})
case "member":
return generateEvent(data, &MemberEvent{})
case "membership":
return generateEvent(data, &MembershipEvent{})
case "page_build":
return generateEvent(data, &PageBuildEvent{})
case "ping":
return nil, nil
case "public":
return generateEvent(data, &PublicEvent{})
case "pull_request":
return generateEvent(data, &PullRequestEvent{})
case "pull_request_review_comment":
return generateEvent(data, &PullRequestReviewCommentEvent{})
case "push":
return generateEvent(data, &PushEvent{})
case "release":
return generateEvent(data, &ReleaseEvent{})
case "repository":
return generateEvent(data, &RepositoryEvent{})
case "status":
return generateEvent(data, &StatusEvent{})
case "team_add":
return generateEvent(data, &TeamAddEvent{})
case "watch":
return generateEvent(data, &WatchEvent{})
}
return nil, &newEventError{"Not a recognized event type"}
}
func checkSignature(secret string, data []byte, signature string) bool {
return hmac.Equal([]byte(signature), []byte(generateSignature(secret, data)))
}
func generateSignature(secret string, data []byte) string {
mac := hmac.New(sha1.New, []byte(secret))
_, _ = mac.Write(data)
result := mac.Sum(nil)
return "sha1=" + hex.EncodeToString(result)
}