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package server
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"io"
"log"
"net/http"
"strings"
"time"
"custard/internal/release"
)
// hookPayload is the subset of Soft Serve's webhook JSON we use.
type hookPayload struct {
Event string `json:"event"`
Repository struct {
Name string `json:"name"`
Description string `json:"description"`
Private bool `json:"private"`
} `json:"repository"`
Ref string `json:"ref"`
Created bool `json:"created"`
Deleted bool `json:"deleted"`
}
// handleReleaseHook receives Soft Serve's branch_tag_create webhook and, for a
// brew-enabled public repo tagged vX.Y.Z, publishes a formula to the tap.
// Disabled (404) unless a webhook secret is configured.
func (s *Server) handleReleaseHook(w http.ResponseWriter, r *http.Request) {
if s.cfg.WebhookSecret == "" {
s.notFound(w, r)
return
}
body, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
if err != nil {
http.Error(w, "bad request", http.StatusBadRequest)
return
}
if !validSignature(r.Header.Get("X-Softserve-Signature"), body, s.cfg.WebhookSecret) {
http.Error(w, "bad signature", http.StatusUnauthorized)
return
}
var p hookPayload
if err := json.Unmarshal(body, &p); err != nil {
http.Error(w, "bad payload", http.StatusBadRequest)
return
}
// Only act on a newly-created ref that could be a release. The exact mode
// (tag vs bookmark) lives in the repo's .custard.yaml, read in publishRelease
// once the pushed objects are readable.
skip := ""
switch {
case p.Event != "branch_tag_create" || !p.Created || p.Deleted:
skip = "not a ref-create"
case p.Repository.Private:
skip = "private repo"
case !couldBeRelease(p.Ref):
skip = "not a release ref"
}
log.Printf("hook: repo=%s ref=%q event=%s created=%v deleted=%v", p.Repository.Name, p.Ref, p.Event, p.Created, p.Deleted)
if skip != "" {
log.Printf("hook: ignored (%s) repo=%s ref=%s", skip, p.Repository.Name, p.Ref)
writeText(w, http.StatusAccepted, "ignored: "+skip)
return
}
repo := p.Repository.Name
go s.publishRelease(repo, p.Ref, p.Repository.Description)
writeText(w, http.StatusAccepted, "accepted: "+repo+" "+p.Ref)
}
// publishRelease reads the repo's opt-in config (retrying while the freshly
// pushed ref becomes readable) and, if brew-enabled and the highest version for
// its mode, publishes to the tap.
func (s *Server) publishRelease(repo, ref, desc string) {
// Short ref name to read config at: strip refs/tags/ or refs/heads/.
readRef := strings.TrimPrefix(strings.TrimPrefix(ref, "refs/tags/"), "refs/heads/")
var cfg release.RepoConfig
var ok bool
for i := 0; i < 30; i++ {
if cfg, ok = release.ReadRepoConfig(s.store, repo, readRef); ok {
break
}
time.Sleep(time.Second)
}
if !ok {
log.Printf("hook: %s@%s — config never became readable; giving up", repo, ref)
return
}
if !cfg.Brew.Enabled {
log.Printf("hook: ignored (not brew-enabled) repo=%s ref=%s", repo, ref)
return
}
archiveRef, version, skip := releasePlan(cfg, ref)
if skip != "" {
log.Printf("hook: ignored (%s) repo=%s ref=%s", skip, repo, ref)
return
}
// Guard against out-of-order versions downgrading the published formula.
highest := s.store.IsHighestVersion(repo, version)
if cfg.ReleaseSource() == release.SourceBookmark {
highest = s.store.IsHighestRelease(repo, cfg.Prefix(), version)
}
if !highest {
log.Printf("hook: ignored (not highest version; %s superseded) repo=%s", version, repo)
return
}
ver, err := release.Publish(release.Options{
Store: s.store,
ReposPath: s.cfg.ReposPath,
DLPath: s.cfg.DLPath,
TapRepo: s.cfg.TapRepo,
BaseURL: s.cfg.BaseURL,
Repo: repo,
Ref: archiveRef,
Tag: version,
Desc: desc,
Package: cfg.Brew.Package,
})
if err != nil {
log.Printf("release %s@%s failed: %v", repo, ref, err)
return
}
log.Printf("released %s %s to tap", repo, ver)
}
// statusReport is the CLI's signed deploy-status update.
type statusReport struct {
Repo string `json:"repo"`
Commit string `json:"commit"`
State string `json:"state"` // preview | prod
URL string `json:"url"`
}
// handleStatus records a deploy-status update from the custard CLI.
func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
if s.cfg.StatusSecret == "" {
s.notFound(w, r)
return
}
body, err := io.ReadAll(io.LimitReader(r.Body, 64<<10))
if err != nil {
http.Error(w, "bad request", http.StatusBadRequest)
return
}
if !validSignature(r.Header.Get("X-Custard-Signature"), body, s.cfg.StatusSecret) {
http.Error(w, "bad signature", http.StatusUnauthorized)
return
}
var sr statusReport
if err := json.Unmarshal(body, &sr); err != nil || sr.Repo == "" || sr.Commit == "" {
http.Error(w, "bad payload", http.StatusBadRequest)
return
}
if err := s.status.Set(sr.Repo, sr.State, sr.Commit, sr.URL); err != nil {
log.Printf("status set %s@%s failed: %v", sr.Repo, sr.Commit, err)
http.Error(w, "store error", http.StatusInternalServerError)
return
}
log.Printf("status: %s %s=%s", sr.Repo, sr.State, sr.Commit[:min(8, len(sr.Commit))])
writeText(w, http.StatusOK, "ok")
}
// validSignature checks the "sha256=<hex>" HMAC over the raw body.
func validSignature(header string, body []byte, secret string) bool {
want, ok := strings.CutPrefix(header, "sha256=")
if !ok {
return false
}
mac := hmac.New(sha256.New, []byte(secret))
mac.Write(body)
got := hex.EncodeToString(mac.Sum(nil))
return hmac.Equal([]byte(got), []byte(want))
}
func writeText(w http.ResponseWriter, code int, msg string) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(code)
_, _ = io.WriteString(w, msg+"\n")
}
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