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package forge

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os/exec"
	"strconv"
	"strings"
	"testing"
)

func gistLogin(t *testing.T, s *Server, h http.Handler, name string) (User, string) {
	t.Helper()
	u, err := s.store.CreateUser(name, "correct horse")
	if err != nil {
		t.Fatal(err)
	}
	w := post(h, "/login", url.Values{"name": {name}, "password": {"correct horse"}, "email": {name + "@example.org"}}, "")
	c := session(w)
	if c == "" {
		t.Fatalf("login %s: %d", name, w.Code)
	}
	return u, c
}

func newGist(t *testing.T, h http.Handler, cookie string, form url.Values) string {
	t.Helper()
	w := post(h, "/gists", form, cookie)
	id := strings.TrimPrefix(w.Header().Get("Location"), "/gist/")
	if w.Code != 303 || !gistID.MatchString(id) {
		t.Fatalf("create gist: %d %s", w.Code, w.Body.String())
	}
	return id
}

func TestGists(t *testing.T) {
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git not installed")
	}
	s, h := testServer(t)
	alice, ac := gistLogin(t, s, h, "alice")
	bob, bc := gistLogin(t, s, h, "bob")
	files := url.Values{"name": {"hello.go", ""}, "content": {"package main\r\n", "plain notes\n"}, "orig": {"", ""}, "description": {"first"}}
	if w := post(h, "/gists", files, ac); w.Code != 400 || !strings.Contains(w.Body.String(), "a day old") {
		t.Fatalf("young account created a gist: %d", w.Code)
	}
	age(t, s, alice)
	age(t, s, bob)
	id := newGist(t, h, ac, files)
	page := get(h, "/gist/"+id, bc).Body.String()
	for _, want := range []string{"hello.go", "gistfile1.txt", "first", "/report?kind=gist"} {
		if !strings.Contains(page, want) {
			t.Errorf("gist page lacks %q", want)
		}
	}
	raw := pagesGet(h, "gist.example.org", "/raw/"+id+"/hello.go")
	if raw.Body.String() != "package main\n" || !strings.HasPrefix(raw.Header().Get("Content-Type"), "text/plain") || !strings.Contains(raw.Header().Get("Content-Security-Policy"), "sandbox") || len(raw.Result().Cookies()) > 0 {
		t.Errorf("raw: %d %q %v", raw.Code, raw.Body.String(), raw.Header())
	}
	if w := pagesGet(h, "gist.example.org", "/gists"); w.Code == 200 {
		t.Error("raw host serves the web app")
	}
	if w := pagesGet(h, "gist.example.org", "/embed/"+id); !strings.Contains(w.Body.String(), "hello.go") || !strings.Contains(w.Header().Get("Content-Security-Policy"), "frame-ancestors *") {
		t.Errorf("embed: %d %v", w.Code, w.Header())
	}

	secret := newGist(t, h, ac, url.Values{"name": {"key.txt"}, "content": {"hidden"}, "orig": {""}, "visibility": {"secret"}})
	for path, cookie := range map[string]string{"/gists": ac, "/~alice/gists": bc} {
		if strings.Contains(get(h, path, cookie).Body.String(), secret) {
			t.Errorf("%s lists a secret gist", path)
		}
	}
	if !strings.Contains(get(h, "/~alice/gists", ac).Body.String(), secret) {
		t.Error("owner cannot see their secret gist")
	}

	for _, path := range []string{"/gists/new", "/gist/" + id + "/edit", "/gists", "/~alice/gists?tab=starred"} {
		if w := get(h, path, ac); w.Code != 200 {
			t.Errorf("%s: %d", path, w.Code)
		}
	}
	head := s.gistHead(Gist{ID: id, Owner: alice})
	edit := url.Values{"head": {head}, "name": {"hello.go", "gistfile1.txt"}, "orig": {"hello.go", "gistfile1.txt"}, "content": {"package main\n\nfunc main() {}\n", ""}, "description": {"second"}}
	if w := post(h, "/gist/"+id+"/edit", edit, bc); w.Code != 403 {
		t.Errorf("non-owner edited: %d", w.Code)
	}
	if w := post(h, "/gist/"+id+"/edit", edit, ac); w.Code != 303 {
		t.Fatalf("edit: %d %s", w.Code, w.Body.String())
	}
	if w := post(h, "/gist/"+id+"/edit", edit, ac); w.Code != 400 {
		t.Errorf("stale edit accepted: %d", w.Code)
	}
	log := get(h, "/gist/"+id+"/revisions", bc).Body.String()
	if strings.Count(log, `class="revision"`) != 2 || !strings.Contains(log, "func main() {}") {
		t.Error("revisions do not show both commits")
	}
	if !strings.Contains(get(h, "/gist/"+id+"?rev="+head, bc).Body.String(), "gistfile1.txt") {
		t.Error("old revision not viewable")
	}

	post(h, "/gist/"+id+"/star", nil, bc)
	post(h, "/gist/"+id+"/comment", url.Values{"body": {"nice **work**"}}, bc)
	if w := post(h, "/gist/"+id+"/fork", nil, bc); w.Code != 303 {
		t.Fatalf("fork: %d", w.Code)
	}
	g, err := s.store.Gist(id)
	if err != nil || g.Stars != 1 || g.Forks != 1 || g.Comments != 1 {
		t.Errorf("counts: %+v %v", g, err)
	}
	forks, _ := s.store.GistForks(id)
	if len(forks) != 1 || forks[0].Owner.ID != bob.ID {
		t.Fatalf("forks: %+v", forks)
	}
	if !strings.Contains(get(h, "/gist/"+id, ac).Body.String(), "<strong>work</strong>") {
		t.Error("comment not rendered")
	}

	t.Setenv("GITPOCKET_PUSHER", strconv.FormatInt(bob.ID, 10))
	update := func(ref, tree string) int {
		gd := Git{Dir: gistDir(s.root, "alice", id)}
		out, err := gd.runEnv(ident("T", "[email protected]", timeNow()), []byte("x"), "commit-tree", tree, "-p", head)
		if err != nil {
			t.Fatal(err)
		}
		var errw bytes.Buffer
		return gistPreReceive(s.root, id, strings.NewReader(head+" "+strings.TrimSpace(string(out))+" "+ref+"\n"), &errw)
	}
	gd := Git{Dir: gistDir(s.root, "alice", id)}
	blob, _ := gd.run([]byte("x"), "hash-object", "-w", "--stdin")
	flat, _ := gd.run([]byte("100644 blob "+strings.TrimSpace(string(blob))+"\tok.txt\x00"), "mktree", "-z")
	nested, _ := gd.run([]byte("040000 tree "+strings.TrimSpace(string(flat))+"\tdir\x00"), "mktree", "-z")
	if update("refs/heads/main", strings.TrimSpace(string(flat))) == 0 {
		t.Error("non-owner push accepted")
	}
	t.Setenv("GITPOCKET_PUSHER", strconv.FormatInt(alice.ID, 10))
	if update("refs/heads/main", strings.TrimSpace(string(flat))) != 0 {
		t.Error("owner push refused")
	}
	if update("refs/heads/other", strings.TrimSpace(string(flat))) == 0 {
		t.Error("push to another branch accepted")
	}
	if update("refs/heads/main", strings.TrimSpace(string(nested))) == 0 {
		t.Error("nested tree accepted")
	}

	token, err := s.store.CreateToken(alice.ID, "cli")
	if err != nil {
		t.Fatal(err)
	}
	body := `{"description":"api","public":true,"files":{"a.md":{"content":"# hi"}}}`
	r := httptest.NewRequest("POST", "/api/gists", strings.NewReader(body))
	r.Header.Set("Content-Type", "application/json")
	r.SetBasicAuth("alice", token)
	r.RemoteAddr = "192.0.2.1:1000"
	w := httptest.NewRecorder()
	h.ServeHTTP(w, r)
	var made struct {
		ID    string
		Files map[string]struct{ Content string }
	}
	if w.Code != 201 || json.Unmarshal(w.Body.Bytes(), &made) != nil || made.Files["a.md"].Content != "# hi" {
		t.Fatalf("api create: %d %s", w.Code, w.Body.String())
	}
	if w := get(h, "/api/gists/"+made.ID, ""); w.Code != 200 || !strings.Contains(w.Body.String(), `"a.md"`) {
		t.Errorf("api get: %d", w.Code)
	}
	r = httptest.NewRequest("POST", "/api/gists?file=x.txt", strings.NewReader("raw upload"))
	r.RemoteAddr = "192.0.2.1:1000"
	w = httptest.NewRecorder()
	h.ServeHTTP(w, r)
	if w.Code != 401 {
		t.Errorf("anonymous api create: %d", w.Code)
	}

	if w := post(h, "/gist/"+id+"/delete", nil, bc); w.Code != 403 {
		t.Errorf("non-owner deleted: %d", w.Code)
	}
	if w := post(h, "/gist/"+id+"/delete", nil, ac); w.Code != 303 {
		t.Errorf("delete: %d", w.Code)
	}
	if _, err := s.store.Gist(id); err == nil {
		t.Error("gist survived deletion")
	}
}