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package api
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"path/filepath"
"strings"
"time"
"github.com/google/uuid"
"github.com/thepeterstone/claudomator/internal/config"
"github.com/thepeterstone/claudomator/internal/task"
)
// prRef is a minimal pull request entry used to extract branch names.
type prRef struct {
Head struct {
Ref string `json:"ref"`
} `json:"head"`
}
// checkRunPayload is the GitHub check_run webhook payload.
type checkRunPayload struct {
Action string `json:"action"`
CheckRun struct {
Name string `json:"name"`
Conclusion string `json:"conclusion"`
HTMLURL string `json:"html_url"`
DetailsURL string `json:"details_url"`
HeadSHA string `json:"head_sha"`
CheckSuite struct {
HeadBranch string `json:"head_branch"`
} `json:"check_suite"`
PullRequests []prRef `json:"pull_requests"`
} `json:"check_run"`
Repository struct {
Name string `json:"name"`
FullName string `json:"full_name"`
} `json:"repository"`
}
// workflowRunPayload is the GitHub workflow_run webhook payload.
type workflowRunPayload struct {
Action string `json:"action"`
WorkflowRun struct {
Name string `json:"name"`
Conclusion string `json:"conclusion"`
HTMLURL string `json:"html_url"`
HeadSHA string `json:"head_sha"`
HeadBranch string `json:"head_branch"`
PullRequests []prRef `json:"pull_requests"`
} `json:"workflow_run"`
Repository struct {
Name string `json:"name"`
FullName string `json:"full_name"`
} `json:"repository"`
}
// validateGitHubSignature checks the HMAC-SHA256 signature from GitHub.
func validateGitHubSignature(sig string, body []byte, secret string) bool {
if !strings.HasPrefix(sig, "sha256=") {
return false
}
mac := hmac.New(sha256.New, []byte(secret))
mac.Write(body)
expected := "sha256=" + hex.EncodeToString(mac.Sum(nil))
return hmac.Equal([]byte(sig), []byte(expected))
}
// matchProject finds the best matching project for a repository name.
// Returns the single configured project as a fallback if there's only one.
func matchProject(projects []config.Project, repoName string) *config.Project {
repoLower := strings.ToLower(repoName)
for i := range projects {
p := &projects[i]
nameLower := strings.ToLower(p.Name)
dirBase := strings.ToLower(filepath.Base(p.Dir))
if strings.Contains(nameLower, repoLower) || strings.Contains(dirBase, repoLower) {
return p
}
}
if len(projects) == 1 {
return &projects[0]
}
return nil
}
func (s *Server) handleGitHubWebhook(w http.ResponseWriter, r *http.Request) {
body, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "failed to read body", http.StatusBadRequest)
return
}
// Validate HMAC signature if a secret is configured.
if s.webhookSecret != "" {
sig := r.Header.Get("X-Hub-Signature-256")
if !validateGitHubSignature(sig, body, s.webhookSecret) {
http.Error(w, "invalid signature", http.StatusUnauthorized)
return
}
}
eventType := r.Header.Get("X-GitHub-Event")
slog.Info("github webhook received", "event", eventType, "bytes", len(body))
switch eventType {
case "check_run":
s.handleCheckRunEvent(w, body)
case "workflow_run":
s.handleWorkflowRunEvent(w, body)
default:
w.WriteHeader(http.StatusNoContent)
}
}
func (s *Server) handleCheckRunEvent(w http.ResponseWriter, body []byte) {
var p checkRunPayload
if err := json.Unmarshal(body, &p); err != nil {
http.Error(w, "invalid JSON", http.StatusBadRequest)
return
}
if p.Action != "completed" || p.CheckRun.Conclusion != "failure" {
w.WriteHeader(http.StatusNoContent)
return
}
branch := p.CheckRun.CheckSuite.HeadBranch
if branch == "" && len(p.CheckRun.PullRequests) > 0 {
branch = p.CheckRun.PullRequests[0].Head.Ref
}
htmlURL := p.CheckRun.HTMLURL
if htmlURL == "" {
htmlURL = p.CheckRun.DetailsURL
}
slog.Info("check_run webhook", "repo", p.Repository.FullName, "conclusion", p.CheckRun.Conclusion, "branch", branch, "html_url", htmlURL)
s.createCIFailureTask(w,
p.Repository.Name,
p.Repository.FullName,
branch,
p.CheckRun.HeadSHA,
p.CheckRun.Name,
htmlURL,
)
}
func (s *Server) handleWorkflowRunEvent(w http.ResponseWriter, body []byte) {
var p workflowRunPayload
if err := json.Unmarshal(body, &p); err != nil {
http.Error(w, "invalid JSON", http.StatusBadRequest)
return
}
if p.Action != "completed" {
w.WriteHeader(http.StatusNoContent)
return
}
if p.WorkflowRun.Conclusion != "failure" && p.WorkflowRun.Conclusion != "timed_out" {
w.WriteHeader(http.StatusNoContent)
return
}
branch := p.WorkflowRun.HeadBranch
if branch == "" && len(p.WorkflowRun.PullRequests) > 0 {
branch = p.WorkflowRun.PullRequests[0].Head.Ref
}
slog.Info("workflow_run webhook", "repo", p.Repository.FullName, "conclusion", p.WorkflowRun.Conclusion, "branch", branch, "html_url", p.WorkflowRun.HTMLURL)
s.createCIFailureTask(w,
p.Repository.Name,
p.Repository.FullName,
branch,
p.WorkflowRun.HeadSHA,
p.WorkflowRun.Name,
p.WorkflowRun.HTMLURL,
)
}
func (s *Server) createCIFailureTask(w http.ResponseWriter, repoName, fullName, branch, sha, checkName, htmlURL string) {
project := matchProject(s.projects, repoName)
if htmlURL == "" && fullName != "" && sha != "" {
htmlURL = fmt.Sprintf("https://github.com/%s/commit/%s", fullName, sha)
}
instructions := fmt.Sprintf(
"A CI failure has been detected and requires investigation.\n\n"+
"Repository: %s\n"+
"Branch: %s\n"+
"Commit SHA: %s\n"+
"Check/Workflow: %s\n"+
"Run URL: %s\n\n"+
"Please investigate the failure by:\n"+
"1. Reviewing recent commits on the branch\n"+
"2. Checking the CI logs at the URL above\n"+
"3. Identifying the root cause of the failure\n"+
"4. Fixing the root cause and ensuring the build passes",
fullName, branch, sha, checkName, htmlURL,
)
now := time.Now().UTC()
t := &task.Task{
ID: uuid.New().String(),
Name: fmt.Sprintf("Fix CI failure: %s on %s", checkName, branch),
Agent: task.AgentConfig{
Type: "claude",
Model: "sonnet",
Instructions: instructions,
MaxBudgetUSD: 3.0,
AllowedTools: []string{"Read", "Edit", "Bash", "Glob", "Grep"},
},
Priority: task.PriorityNormal,
Tags: []string{"ci", "auto"},
DependsOn: []string{},
Retry: task.RetryConfig{MaxAttempts: 1, Backoff: "exponential"},
State: task.StatePending,
CreatedAt: now,
UpdatedAt: now,
}
if project != nil {
t.RepositoryURL = fmt.Sprintf("https://github.com/%s.git", fullName)
t.Project = project.Name
}
if err := s.store.CreateTask(t); err != nil {
writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
return
}
writeJSON(w, http.StatusOK, map[string]string{"task_id": t.ID})
}
|
