117 lines
3.1 KiB
Go
117 lines
3.1 KiB
Go
package gitea
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"git.rootprojects.org/root/gitdeploy/internal/log"
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"git.rootprojects.org/root/gitdeploy/internal/options"
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"git.rootprojects.org/root/gitdeploy/internal/webhooks"
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"github.com/go-chi/chi"
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)
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func init() {
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var secret string
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name := "gitea"
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options.ServerFlags.StringVar(
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&secret, fmt.Sprintf("%s-secret", name), "",
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fmt.Sprintf(
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"secret for %s webhooks (same as %s_SECRET=)",
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name, strings.ToUpper(name)),
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)
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webhooks.AddProvider("gitea", InitWebhook("gitea", &secret, "GITEA_SECRET"))
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}
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// InitWebhook prepares the webhook router.
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// It should be called after arguments are parsed and ENVs are set.InitWebhook
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func InitWebhook(providername string, secretList *string, envname string) func() {
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return func() {
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secrets := webhooks.ParseSecrets(providername, *secretList, envname)
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if 0 == len(secrets) {
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fmt.Fprintf(os.Stderr, "skipped route for missing %q\n", envname)
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return
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}
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webhooks.AddRouteHandler(providername, func(router chi.Router) {
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router.Post("/", func(w http.ResponseWriter, r *http.Request) {
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r.Body = http.MaxBytesReader(w, r.Body, options.DefaultMaxBodySize)
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payload, err := ioutil.ReadAll(r.Body)
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if err != nil {
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// if there's a read error, it should have been handled already by the MaxBytesReader
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return
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}
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var valid bool
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sig := r.Header.Get("X-Gitea-Signature")
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sigB, err := hex.DecodeString(sig)
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for _, secret := range secrets {
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if ValidMAC(payload, sigB, secret) {
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valid = true
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break
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}
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}
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if !valid {
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log.Printf("invalid %q signature: %q\n", providername, sig)
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http.Error(w, fmt.Sprintf("invalid %q signature", providername), http.StatusBadRequest)
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return
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}
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info := Webhook{}
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if err := json.Unmarshal(payload, &info); nil != err {
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log.Printf("invalid gitea payload: error: %s\n%s\n", err, string(payload))
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http.Error(w, "invalid gitea payload", http.StatusBadRequest)
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return
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}
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var tag string
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var branch string
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ref := info.Ref // refs/heads/master
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parts := strings.Split(ref, "/")
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refType := parts[1] // refs/[heads]/master
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prefixLen := len("refs/") + len(refType) + len("/")
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refName := ref[prefixLen:]
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switch refType {
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case "tags":
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refType = "tag"
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tag = refName
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case "heads":
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refType = "branch"
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branch = refName
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default:
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refType = "unknown"
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}
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webhooks.Hook(webhooks.Ref{
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HTTPSURL: info.Repository.CloneURL,
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SSHURL: info.Repository.SSHURL,
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Rev: info.After,
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Ref: ref,
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RefType: refType,
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RefName: refName,
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Branch: branch,
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Tag: tag,
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Repo: info.Repository.Name,
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Owner: info.Repository.Owner.Login,
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})
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})
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})
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}
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}
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// ValidMAC reports whether messageMAC is a valid HMAC tag for message.
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func ValidMAC(message, messageMAC, key []byte) bool {
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mac := hmac.New(sha256.New, key)
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mac.Write(message)
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expectedMAC := mac.Sum(nil)
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return hmac.Equal(messageMAC, expectedMAC)
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}
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