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gitlab_app.go
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gitlab_app.go
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package probot
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"os"
"github.com/spf13/pflag"
"github.com/xanzy/go-gitlab"
)
func NewGitLabAPP() App[GitLabClient] {
return &gitlabApp{
handlers: make(map[string]Handler),
// graphqlClients: make(map[int64]*githubv4.Client),
serveMux: http.NewServeMux(),
metrics: new(eventMetrics),
}
}
type gitlabApp struct {
handlers map[string]Handler
client *gitlab.Client
baseURL string
token []byte
tokenFile string
secret []byte
secretFile string
serverOpts ServerOptions
serveMux *http.ServeMux
metrics *eventMetrics
loggerOptions
}
func (app *gitlabApp) AddFlags(flags *pflag.FlagSet) {
app.serverOpts.AddFlags(flags)
app.loggerOptions.AddFlags(flags)
flags.StringVar(&app.tokenFile, "gitlab.token-file", "", "GitLab token file")
flags.StringVar(&app.secretFile, "gitlab.secret-file", "", "GitLab token file")
flags.StringVar(&app.baseURL, "gitlab.base-url", "https://gitlab.com", "GitLab base URL")
}
func (app *gitlabApp) On(events ...WebhookEvent) handlerLoader {
return handlerLoadFunc(func(h Handler) error {
for _, event := range events {
key := event.Type()
if action := event.Action(); action != "" {
key = key + "." + action
}
if _, ok := app.handlers[key]; ok {
return fmt.Errorf("event type %s already exists", key)
}
app.handlers[key] = h
app.metrics.add(key, event.Type())
}
return nil
})
}
func (app *gitlabApp) Run(ctx context.Context) error {
// TODO: Implement
if err := app.initialize(); err != nil {
return err
}
if app.serverOpts.Path == "" {
app.serverOpts.Path = "/"
}
app.serveMux.HandleFunc(app.serverOpts.Path, app.handle)
server := &http.Server{Addr: fmt.Sprintf("%s:%d", app.serverOpts.Address, app.serverOpts.Port), Handler: app.serveMux}
server.RegisterOnShutdown(app.shutdown)
app.logger.Info("Kuilei hook is serving", "addr", server.Addr)
return server.ListenAndServe()
}
//go:generate go run tools/codegen/main.go -t gitlab_app_handle.go.tmpl -v gitlab_events.yaml -o gitlab_app_handle.go
func (app *gitlabApp) handle(w http.ResponseWriter, r *http.Request) {
var handlerKey string
defer func() {
if e := recover(); e != nil {
err, ok := e.(error)
if ok {
app.handleError(w, err, http.StatusBadRequest)
app.logger.Error(
err, "Failed handle event",
"handler_key", handlerKey,
)
}
} else {
app.logger.Info("Succeeded to handle event", "handler_key", handlerKey)
}
}()
ctx, cancel := context.WithCancel(r.Context())
defer cancel()
if r.Method != http.MethodPost {
app.handleError(w, fmt.Errorf("method %s not found", r.Method), http.StatusNotFound)
return
}
eventType := gitlab.WebhookEventType(r)
app.logger.Info("Handle event", "event", eventType)
rawPayload, err := validateGitLabPayload(r, string(app.secret))
if err != nil {
app.handleError(w, fmt.Errorf("failed to validate payload, %w", err), http.StatusBadRequest)
return
}
payload, err := gitlab.ParseHook(eventType, rawPayload)
if err != nil {
app.handleError(w, fmt.Errorf("failed to parse webhook, %w", err), http.StatusBadRequest)
return
}
handlerKey = app.handelEvent(ctx, w, r, string(eventType), payload)
}
func (app *gitlabApp) shutdown() {}
func (app *gitlabApp) ServeMux() *http.ServeMux {
return app.serveMux
}
func (app *gitlabApp) GetServerOptions() ServerOptions {
return app.serverOpts
}
func (app *gitlabApp) GetHTTPHandler() http.Handler {
return http.HandlerFunc(app.handle)
}
func (app *gitlabApp) GetSecretToken() []byte {
// TODO: Implement
return nil
}
func (app *gitlabApp) initialize() (err error) {
app.token, err = os.ReadFile(app.tokenFile)
if err != nil {
return
}
app.client, err = gitlab.NewClient(string(app.token), gitlab.WithBaseURL(app.baseURL), gitlab.WithHTTPClient(http.DefaultClient))
if err != nil {
return
}
return nil
}
func (app *gitlabApp) handleError(w http.ResponseWriter, err error, status int) {
w.WriteHeader(status)
fmt.Fprint(w, err.Error())
}
func validateGitLabPayload(r *http.Request, secret string) (payload []byte, err error) {
signature := r.Header.Get("X-Gitlab-Token")
if signature != secret {
return nil, errors.New("token validation failed")
}
return io.ReadAll(r.Body)
}