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|
package forge
import (
"errors"
"fmt"
"log"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"slices"
"strings"
)
type problem struct {
code int
msg string
}
func (p *problem) Error() string { return p.msg }
func refuse(code int, msg string) error { return &problem{code, msg} }
func short(h string) string {
if len(h) > 10 {
return h[:10]
}
return h
}
func problemCode(err error) int {
var p *problem
if errors.As(err, &p) {
return p.code
}
return 400
}
func (s *Server) settle(w http.ResponseWriter, r *http.Request, back string, err error) {
switch {
case err == nil:
http.Redirect(w, r, back, http.StatusSeeOther)
case problemCode(err) == 400 || problemCode(err) == 409:
target, frag, _ := strings.Cut(back, "#")
if frag != "" {
frag = "#" + frag
}
http.Redirect(w, r, target+"?error="+url.QueryEscape(err.Error())+frag, http.StatusSeeOther)
default:
s.fail(w, r, problemCode(err), err.Error())
}
}
func (s *Server) materialise(repo Repo, build func(dir string) error) error {
dir := s.repoDir(repo)
err := os.MkdirAll(filepath.Dir(dir), 0o755)
if err == nil {
err = build(dir)
}
if err != nil {
log.Printf("create %s: %v", repo.Path(), err)
os.RemoveAll(dir)
s.store.DeleteRepo(repo.ID)
return refuse(500, "Could not create the repository")
}
installHook(s.root, s.host, dir)
return nil
}
func (s *Server) createRepo(u User, ownerName, name, description string, vis int, tags string) (Repo, error) {
owner := u
if ownerName != "" && ownerName != u.Name {
org, err := s.store.UserByName(ownerName)
if err != nil || !s.store.IsOrg(org.ID) || !s.store.IsMember(org.ID, u.ID) {
return Repo{}, refuse(403, "You are not a member of that organization")
}
owner = org
}
if s.uploads.blocked("create:" + u.Name) {
return Repo{}, refuse(429, "Too many new repositories, try again later")
}
s.uploads.fail("create:" + u.Name)
repo, err := s.store.CreateRepo(owner, strings.TrimSpace(name), strings.TrimSpace(description), vis, tags)
if err != nil {
return Repo{}, err
}
return repo, s.materialise(repo, initRepo)
}
func (s *Server) forkRepo(u User, repo Repo) (Repo, error) {
if u.ID == repo.Owner.ID {
return Repo{}, refuse(409, "You cannot fork your own repository")
}
if s.shunned(repo, &u) {
return Repo{}, refuse(403, "You cannot fork this repository")
}
if s.uploads.blocked("create:" + u.Name) {
return Repo{}, refuse(429, "Too many new repositories, try again later")
}
s.uploads.fail("create:" + u.Name)
fork, err := s.store.ForkRepo(u, repo)
if err != nil {
return Repo{}, err
}
return fork, s.materialise(fork, func(dir string) error { return cloneRepo(s.repoDir(repo), dir) })
}
func (s *Server) ownRepo(u *User, repo Repo) error {
if !s.store.Owns(repo, u) {
return refuse(403, "Not your repository")
}
return nil
}
func (s *Server) renameRepoTo(u User, repo Repo, name string) (Repo, error) {
if err := s.ownRepo(&u, repo); err != nil {
return repo, err
}
if name == repo.Name {
return repo, nil
}
if err := s.store.RenameRepo(repo.ID, name); err != nil {
return repo, err
}
renamed := repo
renamed.Name = name
if err := os.Rename(s.repoDir(repo), s.repoDir(renamed)); err != nil {
s.store.RenameRepo(repo.ID, repo.Name)
return repo, refuse(500, err.Error())
}
s.store.AddRedirect(repo.Owner.Name, repo.Name, repo.ID)
return renamed, nil
}
func (s *Server) transferRepoTo(u User, repo Repo, owner string) (Repo, error) {
if err := s.ownRepo(&u, repo); err != nil {
return repo, err
}
target, err := s.store.UserByName(strings.TrimSpace(strings.TrimPrefix(owner, "~")))
if err != nil {
return repo, refuse(404, "No such user")
}
if target.ID == repo.Owner.ID {
return repo, nil
}
if err := s.store.TransferRepo(repo.ID, target.ID); err != nil {
return repo, err
}
moved := repo
moved.Owner = target
os.MkdirAll(filepath.Dir(s.repoDir(moved)), 0o755)
if err := os.Rename(s.repoDir(repo), s.repoDir(moved)); err != nil {
s.store.TransferRepo(repo.ID, repo.Owner.ID)
return repo, refuse(500, err.Error())
}
s.store.AddRedirect(repo.Owner.Name, repo.Name, repo.ID)
s.notify(s.store.VerifiedEmail(target.ID), fmt.Sprintf("[%s] repository transferred to you", moved.Path()),
fmt.Sprintf("~%s transferred %s to you. It now lives at https://%s/%s\n", repo.Owner.Name, repo.Name, s.host, moved.Path()))
return moved, nil
}
func (s *Server) removeRepo(u User, repo Repo) error {
if err := s.ownRepo(&u, repo); err != nil {
return err
}
if err := s.store.DeleteRepo(repo.ID); err != nil {
return refuse(500, err.Error())
}
os.RemoveAll(s.repoDir(repo))
return nil
}
func (s *Server) starRepo(u User, repo Repo, on bool) error {
if on && s.shunned(repo, &u) {
return refuse(403, "You cannot star this repository")
}
s.store.Star(u.ID, repo.ID, on)
return nil
}
func (s *Server) followUser(u User, owner User, on bool) error {
if u.ID == owner.ID {
return refuse(409, "You cannot follow yourself")
}
if on && s.store.Blocked(owner.ID, u.ID) {
return refuse(403, "You cannot follow this account")
}
s.store.Follow(u.ID, owner.ID, on)
return nil
}
func (s *Server) setMember(u User, org User, name string, on bool) error {
if !s.store.IsMember(org.ID, u.ID) {
return refuse(403, "You are not a member of this organization")
}
target, err := s.store.UserByName(strings.TrimPrefix(strings.TrimSpace(name), "~"))
if err != nil || s.store.IsOrg(target.ID) {
return refuse(404, "No such user")
}
if !on && len(s.store.Members(org.ID)) == 1 && s.store.IsMember(org.ID, target.ID) {
return refuse(409, "An organization needs at least one member")
}
return s.store.SetMember(org.ID, target.ID, on)
}
func (s *Server) createOrg(u User, name string) (User, error) {
if s.limiter.blocked("org:" + u.Name) {
return User{}, refuse(429, "Too many organizations created recently, try again later")
}
org, err := s.store.CreateOrg(strings.TrimSpace(name))
if err == nil {
err = s.store.SetMember(org.ID, u.ID, true)
}
if err != nil {
return User{}, err
}
s.limiter.fail("org:" + u.Name)
return org, nil
}
func (s *Server) openIssue(u User, repo Repo, title, body string) (Issue, error) {
if repo.Archived {
return Issue{}, refuse(403, "This repository is archived")
}
if s.shunned(repo, &u) {
return Issue{}, refuse(403, "You cannot open issues here")
}
if !s.store.ThreadBudget(u.ID) {
return Issue{}, refuse(429, "Too many new issues and pull requests, try again later")
}
issue, err := s.store.CreateIssue(repo, u, title, strings.TrimSpace(body))
if err != nil {
return Issue{}, err
}
s.store.Notify(s.store.Watchers(repo, "issue", issue.ID, issue.Author.ID), u, repo, "issue", issue.Number, issue.Title, "opened")
if repo.Owner.ID != u.ID {
s.notify(s.store.VerifiedEmail(repo.Owner.ID), fmt.Sprintf("[%s] issue #%d: %s", repo.Path(), issue.Number, issue.Title),
fmt.Sprintf("~%s opened an issue on %s.\n\n%s\n\nhttps://%s/%s/issues/%d\n", u.Name, repo.Path(), issue.Body, s.host, repo.Path(), issue.Number))
}
return issue, nil
}
func (s *Server) commentIssue(u User, repo Repo, issue Issue, body string) error {
if repo.Archived {
return refuse(403, "This repository is archived")
}
if s.shunned(repo, &u) {
return refuse(403, "You cannot comment here")
}
if err := s.store.AddIssueComment(issue.ID, u, body); err != nil {
return err
}
s.store.Notify(s.store.Watchers(repo, "issue", issue.ID, issue.Author.ID), u, repo, "issue", issue.Number, issue.Title, "commented on")
subject := fmt.Sprintf("[%s] issue #%d: %s", repo.Path(), issue.Number, issue.Title)
link := fmt.Sprintf("https://%s/%s/issues/%d", s.host, repo.Path(), issue.Number)
for _, id := range []int64{issue.Author.ID, repo.Owner.ID} {
if id != u.ID {
s.notify(s.store.VerifiedEmail(id), subject, fmt.Sprintf("~%s commented on issue #%d.\n\n%s\n\n%s\n", u.Name, issue.Number, body, link))
}
}
return nil
}
func (s *Server) setIssueState(u User, repo Repo, issue Issue, open bool) error {
if !s.store.CanWrite(repo, &u) && u.ID != issue.Author.ID {
return refuse(403, "Only collaborators and the author can close or reopen this issue")
}
state, verb := "closed", "closed"
if open {
state, verb = "open", "reopened"
}
if issue.State == state {
return nil
}
s.store.SetIssueState(issue.ID, state)
s.store.Notify(s.store.Watchers(repo, "issue", issue.ID, issue.Author.ID), u, repo, "issue", issue.Number, issue.Title, verb)
return nil
}
func (s *Server) setLabels(u User, repo Repo, kind string, item int64, ids []int64) error {
if !s.store.CanWrite(repo, &u) {
return refuse(403, "Only collaborators can change labels and assignees")
}
s.store.SetItemLabels(kind, item, repo.ID, ids)
return nil
}
func (s *Server) setAssignees(u User, repo Repo, kind string, item int64, ids []int64) error {
if !s.store.CanWrite(repo, &u) {
return refuse(403, "Only collaborators can change labels and assignees")
}
allowed := map[int64]bool{}
for _, a := range s.store.Assignable(repo) {
allowed[a.ID] = true
}
var keep []int64
for _, id := range ids {
if allowed[id] {
keep = append(keep, id)
}
}
s.store.SetAssignees(kind, item, keep)
return nil
}
func (s *Server) openPull(u User, repo Repo, source, target, title, body string, draft bool) (Pull, error) {
g := Git{Dir: s.repoDir(repo)}
if repo.Archived {
return Pull{}, refuse(403, "This repository is archived")
}
if s.store.IsPullMirror(repo.ID) {
return Pull{}, refuse(403, "This repository is a mirror and does not take pull requests")
}
if s.shunned(repo, &u) {
return Pull{}, refuse(403, "You cannot open pull requests here")
}
if !s.store.ThreadBudget(u.ID) {
return Pull{}, refuse(429, "Too many new issues and pull requests, try again later")
}
src, branch, err := s.resolveSource(repo, &u, source)
if err != nil {
return Pull{}, err
}
if _, err := g.Resolve("refs/heads/" + target); err != nil || !validBranch(target) {
return Pull{}, refuse(400, "No such target branch")
}
if src.ID == repo.ID && branch == target {
return Pull{}, refuse(400, "Source and target are the same branch")
}
pull, err := s.store.CreatePull(repo, u, title, strings.TrimSpace(body), src, branch, target)
if err != nil {
return Pull{}, err
}
if draft {
s.store.SetDraft(pull.ID, true)
pull.Draft = true
}
if err := g.Fetch(s.repoDir(src), "refs/heads/"+branch, pull.Ref()); err != nil {
return Pull{}, refuse(500, "Could not fetch the source branch: "+err.Error())
}
g.RecordRevision(pull)
s.store.Notify(s.store.Watchers(repo, "pull", pull.ID, pull.Author.ID), u, repo, "pull", pull.Number, pull.Title, "opened")
if repo.Owner.ID != u.ID {
s.notify(s.store.VerifiedEmail(repo.Owner.ID), fmt.Sprintf("[%s] pull request #%d: %s", repo.Path(), pull.Number, pull.Title),
fmt.Sprintf("~%s opened a pull request on %s.\n\n%s\n\nhttps://%s/%s/pulls/%d\n", u.Name, repo.Path(), pull.Body, s.host, repo.Path(), pull.Number))
}
return pull, nil
}
func (s *Server) pullGuard(u User, pull Pull, closing bool) error {
if pull.Repo.Archived {
return refuse(403, "This repository is archived")
}
if !closing && s.shunned(pull.Repo, &u) {
return refuse(403, "You cannot take part here")
}
return nil
}
func (s *Server) pullManager(u User, pull Pull) bool {
return s.store.CanWrite(pull.Repo, &u) || u.ID == pull.Author.ID
}
func (s *Server) commentPull(u User, pull Pull, body string) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
if err := s.store.AddComment(pull.ID, u, body); err != nil {
return err
}
s.notifyPull(pull, u, "commented on", body)
return nil
}
func (s *Server) setPullState(u User, pull Pull, open bool) error {
if err := s.pullGuard(u, pull, true); err != nil {
return err
}
if !s.pullManager(u, pull) {
return refuse(403, "Only collaborators and the author can close or reopen this pull request")
}
from, to, verb := "open", "closed", "closed"
if open {
from, to, verb = "closed", "open", "reopened"
}
if pull.State != from {
return refuse(409, "This pull request is "+pull.State)
}
s.store.SetPullState(pull.ID, to, "")
s.store.Notify(s.store.Watchers(pull.Repo, "pull", pull.ID, pull.Author.ID), u, pull.Repo, "pull", pull.Number, pull.Title, verb)
return nil
}
func (s *Server) setPullDraft(u User, pull Pull, draft bool) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
if !s.pullManager(u, pull) {
return refuse(403, "Only collaborators and the author can change the draft state")
}
s.store.SetDraft(pull.ID, draft)
return nil
}
func (s *Server) notePull(u User, pull Pull, filePath, side string, line int, body string) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
if err := s.store.AddReview(pull.ID, u, filePath, side, line, body); err != nil {
return err
}
s.notifyPull(pull, u, fmt.Sprintf("reviewed %s line %d on", filePath, line), body)
return nil
}
func (s *Server) touchNote(u User, pull Pull, id int64, action string) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
notes, _ := s.store.Reviews(pull.ID)
i := slices.IndexFunc(notes, func(r Review) bool { return r.ID == id })
if i < 0 {
return refuse(404, "No such comment on this pull request")
}
author := notes[i].Author.ID
if author != u.ID && !s.store.CanWrite(pull.Repo, &u) {
return refuse(403, "Not your comment")
}
switch action {
case "resolve":
s.store.ResolveReview(id, true)
case "unresolve":
s.store.ResolveReview(id, false)
case "delete":
s.store.DeleteReview(id)
}
return nil
}
func (s *Server) judgePull(u User, pull Pull, state, body string) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
if u.ID == pull.Author.ID && state != "comment" {
return refuse(403, "You cannot approve your own pull request")
}
head, _ := Git{Dir: s.repoDir(pull.Repo)}.Resolve(pull.Ref())
if err := s.store.AddPRReview(pull.ID, u, state, body, head); err != nil {
return err
}
verb := map[string]string{"approved": "approved", "changes": "requested changes on", "comment": "reviewed"}[state]
s.notifyPull(pull, u, verb, body)
return nil
}
func (s *Server) refreshPull(u User, pull Pull) error {
if err := s.pullGuard(u, pull, false); err != nil {
return err
}
if !s.pullManager(u, pull) {
return refuse(403, "Only collaborators and the author can update this pull request")
}
if pull.State != "open" || pull.Agit != "" {
return refuse(409, "Only open pull requests from a branch can be updated")
}
g := Git{Dir: s.repoDir(pull.Repo)}
if err := g.Fetch(s.repoDir(pull.SourceRepo), "refs/heads/"+pull.SourceBranch, pull.Ref()); err != nil {
return err
}
g.RecordRevision(pull)
s.store.TouchPull(pull.ID)
return nil
}
func (s *Server) mergePull(u User, pull Pull, strategy, title, body string) (string, error) {
if err := s.pullGuard(u, pull, false); err != nil {
return "", err
}
repo := pull.Repo
if s.store.IsPullMirror(repo.ID) {
return "", refuse(403, "This repository is a mirror and read only")
}
if !s.store.CanWrite(repo, &u) {
return "", refuse(403, "Only people who can push here can merge")
}
if pull.State != "open" {
return "", refuse(409, "This pull request is "+pull.State)
}
if pull.Draft {
return "", refuse(409, "Draft pull requests cannot be merged")
}
g := Git{Dir: s.repoDir(repo)}
if prot, ok := s.store.Protection(repo.ID, pull.TargetBranch); ok && prot.Approvals > 0 {
head, _ := g.Resolve(pull.Ref())
approvals, changes := latestVerdicts(s.store.PRReviews(pull.ID), head)
if approvals < prot.Approvals || changes > 0 {
return "", refuse(409, fmt.Sprintf("%s needs %d approving reviews of the current head and no outstanding change requests", pull.TargetBranch, prot.Approvals))
}
}
title = strings.TrimSpace(title)
if title == "" {
title = mergeTitle(pull)
}
message := title
if body = strings.TrimSpace(body); body != "" {
message += "\n\n" + body
}
var hash string
var err error
switch strategy {
case "squash":
hash, err = g.Squash(pull.TargetBranch, pull.Ref(), message, pull.Author.Name, pull.Author.Name+"@"+s.host, u.Name, u.Name+"@"+s.host)
case "rebase":
hash, err = g.Rebase(pull.TargetBranch, pull.Ref(), u.Name, u.Name+"@"+s.host)
case "ff":
hash, err = g.FastForward(pull.TargetBranch, pull.Ref(), pull.baseRef())
case "", "merge":
hash, err = g.Merge(pull.TargetBranch, pull.Ref(), message, u.Name, u.Name+"@"+s.host)
default:
return "", refuse(400, "Strategy must be merge, squash, rebase or ff")
}
if err != nil {
return "", refuse(409, err.Error())
}
s.store.SetPullState(pull.ID, "merged", hash)
s.notifyPull(pull, u, "merged", "")
return hash, nil
}
func (s *Server) editable(u *User, repo Repo, branch string) (Git, string, error) {
g := Git{Dir: s.repoDir(repo)}
if !s.store.CanWrite(repo, u) {
return g, "", refuse(403, "You cannot write to this repository")
}
if repo.Archived {
return g, "", refuse(403, "This repository is archived")
}
if s.store.IsPullMirror(repo.ID) {
return g, "", refuse(403, "This repository is a mirror and read only")
}
head, err := g.Resolve("refs/heads/" + branch)
if err != nil || !validBranch(branch) {
return g, "", refuse(404, "Edits need a branch, not a tag or commit")
}
if prot, ok := s.store.Protection(repo.ID, branch); ok && prot.RequirePR {
return g, "", refuse(403, branch+" only accepts changes through pull requests")
}
return g, head, nil
}
func (s *Server) writeFile(u User, repo Repo, branch, filePath string, content []byte, remove bool, message, parent string) (string, error) {
g, head, err := s.editable(&u, repo, branch)
if err != nil {
return "", err
}
if parent != "" && parent != head {
return "", refuse(409, branch+" has moved on since "+short(parent))
}
kind := g.Kind(head, filePath)
if remove && kind != "blob" {
return "", refuse(404, "No such file")
}
if kind == "tree" {
return "", refuse(409, filePath+" is a directory")
}
if strings.TrimSpace(message) == "" {
verb := "Update "
switch {
case remove:
verb = "Delete "
case kind == "":
verb = "Create "
}
message = verb + path.Base(filePath)
}
return g.Commit1(branch, head, filePath, content, remove, strings.TrimSpace(message), u.Name, u.Name+"@"+s.host)
}
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