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Go
at master
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import ( "context" "fmt" "log/slog" "net/http" "net/url" "slices" "strconv" "strings"
"github.com/bluesky-social/indigo/atproto/identity" "github.com/bluesky-social/indigo/atproto/syntax" "github.com/go-chi/chi/v5" "tangled.org/core/appview/cache" "tangled.org/core/appview/db" "tangled.org/core/appview/oauth" "tangled.org/core/appview/pages" "tangled.org/core/appview/pagination" "tangled.org/core/appview/reporesolver" "tangled.org/core/appview/state/userutil" "tangled.org/core/idresolver" "tangled.org/core/orm" "tangled.org/core/rbac")
type Middleware struct { oauth *oauth.OAuth db *db.DB enforcer *rbac.Enforcer repoResolver *reporesolver.RepoResolver idResolver *idresolver.Resolver pages *pages.Pages rdb *cache.Cache logger *slog.Logger}
func New(oauth *oauth.OAuth, db *db.DB, enforcer *rbac.Enforcer, repoResolver *reporesolver.RepoResolver, idResolver *idresolver.Resolver, pages *pages.Pages, rdb *cache.Cache, logger *slog.Logger) Middleware { return Middleware{ oauth: oauth, db: db, enforcer: enforcer, repoResolver: repoResolver, idResolver: idResolver, pages: pages, rdb: rdb, logger: logger, }}
type middlewareFunc func(http.Handler) http.Handler
func AuthMiddleware(o *oauth.OAuth) middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { returnURL := "/" if u, err := url.Parse(r.Header.Get("Referer")); err == nil { returnURL = u.RequestURI() }
loginURL := fmt.Sprintf("/login?return_url=%s", url.QueryEscape(returnURL))
redirectFunc := func(w http.ResponseWriter, r *http.Request) { http.Redirect(w, r, loginURL, http.StatusTemporaryRedirect) } if r.Header.Get("HX-Request") == "true" { redirectFunc = func(w http.ResponseWriter, _ *http.Request) { w.Header().Set("HX-Redirect", loginURL) w.WriteHeader(http.StatusOK) } }
sess, err := o.ResumeSession(r) if err != nil { slog.Default().Warn("failed to resume session, redirecting", "err", err, "url", r.URL.String()) redirectFunc(w, r) return }
if sess == nil { slog.Default().Warn("session is nil, redirecting") redirectFunc(w, r) return }
next.ServeHTTP(w, r) }) }}
func Paginate(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { page := pagination.FirstPage()
offsetVal := r.URL.Query().Get("offset") if offsetVal != "" { offset, err := strconv.Atoi(offsetVal) if err != nil { slog.Default().Warn("invalid offset", "value", offsetVal) } else { page.Offset = offset } }
limitVal := r.URL.Query().Get("limit") if limitVal != "" { limit, err := strconv.Atoi(limitVal) if err != nil { slog.Default().Warn("invalid limit", "value", limitVal) } else { page.Limit = limit } }
ctx := pagination.IntoContext(r.Context(), page) next.ServeHTTP(w, r.WithContext(ctx)) })}
func (mw Middleware) knotRoleMiddleware(group string) middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { l := mw.logger.With("middleware", "knotRoleMiddleware") // requires auth also actor := mw.oauth.GetMultiAccountUser(r) if actor == nil { // we need a logged in user l.Warn("not logged in, redirecting") http.Error(w, "Forbidden", http.StatusUnauthorized) return } domain := chi.URLParam(r, "domain") if domain == "" { http.Error(w, "malformed url", http.StatusBadRequest) return }
ok, err := mw.enforcer.E.HasGroupingPolicy(actor.Did, group, domain) if err != nil || !ok { l.Warn("permission denied", "did", actor.Did, "group", group, "domain", domain) http.Error(w, "Forbidden", http.StatusUnauthorized) return }
next.ServeHTTP(w, r) }) }}
func (mw Middleware) KnotOwner() middlewareFunc { return mw.knotRoleMiddleware("server:owner")}
func (mw Middleware) RepoPermissionMiddleware(requiredPerm string) middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { l := mw.logger.With("middleware", "RepoPermissionMiddleware") // requires auth also actor := mw.oauth.GetMultiAccountUser(r) if actor == nil { // we need a logged in user l.Warn("not logged in, redirecting") http.Error(w, "Forbidden", http.StatusUnauthorized) return } f, err := mw.repoResolver.Resolve(r) if err != nil { http.Error(w, "malformed url", http.StatusBadRequest) return }
ok, err := mw.enforcer.E.Enforce(actor.Did, f.Knot, f.RepoIdentifier(), requiredPerm) if err != nil || !ok { l.Warn("permission denied", "did", actor.Did, "perm", requiredPerm, "repo", f.RepoIdentifier()) http.Error(w, "Forbidden", http.StatusUnauthorized) return }
next.ServeHTTP(w, r) }) }}
func (mw Middleware) ResolveIdent() middlewareFunc { excluded := []string{"favicon.ico"}
return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { origSeg := chi.URLParam(req, "user") didOrHandle := strings.TrimPrefix(origSeg, "@")
if slices.Contains(excluded, didOrHandle) { next.ServeHTTP(w, req) return }
id, err := mw.idResolver.ResolveAtIdentifier(req.Context(), didOrHandle) if err != nil { if h, parseErr := syntax.ParseHandle(didOrHandle); parseErr == nil { if did := cache.LookupDidByPreferredHandle(req.Context(), mw.rdb, mw.db, h); did != "" { id, err = mw.idResolver.ResolveAtIdentifier(req.Context(), did) } } } if err != nil { mw.logger.Error("failed to resolve did/handle", "didOrHandle", didOrHandle, "err", err) mw.pages.Error404(w) return }
if req.Method == http.MethodGet && !userutil.IsDid(didOrHandle) { if pref := cache.LookupPreferredHandle(req.Context(), mw.rdb, mw.db, id.DID.String()); pref != "" && didOrHandle != pref { rest := strings.TrimPrefix(req.URL.Path, "/"+origSeg) target := "/" + pref + rest if req.URL.RawQuery != "" { target += "?" + req.URL.RawQuery } http.Redirect(w, req, target, http.StatusFound) return } }
ctx := context.WithValue(req.Context(), "resolvedId", *id)
next.ServeHTTP(w, req.WithContext(ctx)) }) }}
func (mw Middleware) ResolveRepo() middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { l := mw.logger.With("middleware", "ResolveRepo") repoName := chi.URLParam(req, "repo") repoName = strings.TrimSuffix(repoName, ".git")
id, ok := req.Context().Value("resolvedId").(identity.Identity) if !ok { l.Error("malformed middleware") w.WriteHeader(http.StatusInternalServerError) return }
repo, err := db.GetRepo( mw.db, orm.FilterEq("did", id.DID.String()), orm.FilterEq("name", repoName), ) if err != nil { l.Error("failed to resolve repo", "err", err) w.WriteHeader(http.StatusNotFound) mw.pages.ErrorKnot404(w) return }
ctx := context.WithValue(req.Context(), "repo", repo) next.ServeHTTP(w, req.WithContext(ctx)) }) }}
// middleware that is tacked on top of /{user}/{repo}/pulls/{pull}func (mw Middleware) ResolvePull() middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { l := mw.logger.With("middleware", "ResolvePull") f, err := mw.repoResolver.Resolve(r) if err != nil { l.Error("failed to fully resolve repo", "err", err) w.WriteHeader(http.StatusNotFound) mw.pages.ErrorKnot404(w) return }
prId := chi.URLParam(r, "pull") prIdInt, err := strconv.Atoi(prId) if err != nil { l.Error("failed to parse pr id", "err", err) mw.pages.Error404(w) return }
pr, err := db.GetPull(mw.db, orm.FilterEq("repo_at", f.RepoAt()), orm.FilterEq("pull_id", prIdInt)) if err != nil { l.Error("failed to get pull and comments", "err", err) mw.pages.Error404(w) return }
ctx := context.WithValue(r.Context(), "pull", pr)
stack, err := db.GetStack(mw.db, pr.AtUri()) if err != nil { l.Error("failed to get stack", "err", err) mw.pages.Error404(w) return }
ctx = context.WithValue(ctx, "stack", stack)
next.ServeHTTP(w, r.WithContext(ctx)) }) }}
// middleware that is tacked on top of /{user}/{repo}/issues/{issue}func (mw Middleware) ResolveIssue(next http.Handler) http.Handler { l := mw.logger.With("middleware", "ResolveIssue") return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { f, err := mw.repoResolver.Resolve(r) if err != nil { l.Error("failed to fully resolve repo", "err", err) w.WriteHeader(http.StatusNotFound) mw.pages.ErrorKnot404(w) return }
issueIdStr := chi.URLParam(r, "issue") issueId, err := strconv.Atoi(issueIdStr) if err != nil { l.Error("failed to fully resolve issue ID", "err", err) mw.pages.Error404(w) return }
issue, err := db.GetIssue(mw.db, f.RepoAt(), issueId) if err != nil { l.Error("failed to get issues", "err", err) mw.pages.Error404(w) return }
ctx := context.WithValue(r.Context(), "issue", issue) next.ServeHTTP(w, r.WithContext(ctx)) })}
// this should serve the go-import meta tag even if the path is technically// a 404 like tangled.sh/oppi.li/go-git/v5//// we're keeping the tangled.sh go-import tag too to maintain backward// compatibility for modules that still point there. they will be redirected// to fetch source from tangled.orgfunc (mw Middleware) GoImport() middlewareFunc { return func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { l := mw.logger.With("middleware", "GoImport") f, err := mw.repoResolver.Resolve(r) if err != nil { l.Error("failed to fully resolve repo", "err", err) w.WriteHeader(http.StatusNotFound) mw.pages.ErrorKnot404(w) return }
fullName := reporesolver.GetBaseRepoPath(r, f)
if r.Header.Get("User-Agent") == "Go-http-client/1.1" { if r.URL.Query().Get("go-get") == "1" { modulePath := userutil.FlattenDid(fullName) if strings.Contains(modulePath, ":") { modulePath = userutil.FlattenDid(f.Did) + "/" + f.Name } html := fmt.Sprintf( `<meta name="go-import" content="tangled.sh/%s git https://tangled.sh/%s"/><meta name="go-import" content="tangled.org/%s git https://tangled.org/%s"/>`, modulePath, fullName, modulePath, fullName, ) w.Header().Set("Content-Type", "text/html") w.Write([]byte(html)) return } }
next.ServeHTTP(w, r) }) }}