mox/webmail/webmail_test.go

package webmail

import (
	"archive/zip"
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"net/textproto"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
	"time"

	"golang.org/x/net/html"

	"github.com/mjl-/sherpa"

	"github.com/mjl-/mox/message"
	"github.com/mjl-/mox/mox-"
	"github.com/mjl-/mox/moxio"
	"github.com/mjl-/mox/store"
	"github.com/mjl-/mox/webauth"
)

var ctxbg = context.Background()

func init() {
	webauth.BadAuthDelay = 0
}

func tcheck(t *testing.T, err error, msg string) {
	t.Helper()
	if err != nil {
		t.Fatalf("%s: %s", msg, err)
	}
}

func tcompare(t *testing.T, got, exp any) {
	t.Helper()
	if !reflect.DeepEqual(got, exp) {
		t.Fatalf("got %v, expected %v", got, exp)
	}
}

type Message struct {
	From, To, Cc, Bcc, Subject, MessageID string
	Headers                               [][2]string
	Date                                  time.Time
	References                            string
	Part                                  Part
}

type Part struct {
	Type             string
	ID               string
	Disposition      string
	TransferEncoding string

	Content string
	Parts   []Part

	boundary string
}

func (m Message) Marshal(t *testing.T) []byte {
	if m.Date.IsZero() {
		m.Date = time.Now()
	}
	if m.MessageID == "" {
		m.MessageID = "<" + mox.MessageIDGen(false) + ">"
	}

	var b bytes.Buffer
	header := func(k, v string) {
		if v == "" {
			return
		}
		_, err := fmt.Fprintf(&b, "%s: %s\r\n", k, v)
		tcheck(t, err, "write header")
	}

	header("From", m.From)
	header("To", m.To)
	header("Cc", m.Cc)
	header("Bcc", m.Bcc)
	header("Subject", m.Subject)
	header("Message-Id", m.MessageID)
	header("Date", m.Date.Format(message.RFC5322Z))
	header("References", m.References)
	for _, t := range m.Headers {
		header(t[0], t[1])
	}
	header("Mime-Version", "1.0")
	if len(m.Part.Parts) > 0 {
		m.Part.boundary = multipart.NewWriter(io.Discard).Boundary()
	}
	m.Part.WriteHeader(t, &b)
	m.Part.WriteBody(t, &b)
	return b.Bytes()
}

func (p Part) Header() textproto.MIMEHeader {
	h := textproto.MIMEHeader{}
	add := func(k, v string) {
		if v != "" {
			h.Add(k, v)
		}
	}
	ct := p.Type
	if p.boundary != "" {
		ct += fmt.Sprintf(`; boundary="%s"`, p.boundary)
	}
	add("Content-Type", ct)
	add("Content-Id", p.ID)
	add("Content-Disposition", p.Disposition)
	add("Content-Transfer-Encoding", p.TransferEncoding) // todo: ensure if not multipart? probably ensure before calling headre
	return h
}

func (p Part) WriteHeader(t *testing.T, w io.Writer) {
	for k, vl := range p.Header() {
		for _, v := range vl {
			_, err := fmt.Fprintf(w, "%s: %s\r\n", k, v)
			tcheck(t, err, "write header")
		}
	}
	_, err := fmt.Fprint(w, "\r\n")
	tcheck(t, err, "write line")
}

func (p Part) WriteBody(t *testing.T, w io.Writer) {
	if len(p.Parts) == 0 {
		switch p.TransferEncoding {
		case "base64":
			bw := moxio.Base64Writer(w)
			_, err := bw.Write([]byte(p.Content))
			tcheck(t, err, "writing base64")
			err = bw.Close()
			tcheck(t, err, "closing base64 part")
		case "":
			if p.Content == "" {
				t.Fatalf("cannot write empty part")
			}
			if !strings.HasSuffix(p.Content, "\n") {
				p.Content += "\n"
			}
			p.Content = strings.ReplaceAll(p.Content, "\n", "\r\n")
			_, err := w.Write([]byte(p.Content))
			tcheck(t, err, "write content")
		default:
			t.Fatalf("unknown transfer-encoding %q", p.TransferEncoding)
		}
		return
	}

	mp := multipart.NewWriter(w)
	mp.SetBoundary(p.boundary)
	for _, sp := range p.Parts {
		if len(sp.Parts) > 0 {
			sp.boundary = multipart.NewWriter(io.Discard).Boundary()
		}
		pw, err := mp.CreatePart(sp.Header())
		tcheck(t, err, "create part")
		sp.WriteBody(t, pw)
	}
	err := mp.Close()
	tcheck(t, err, "close multipart")
}

var (
	msgMinimal = Message{
		Part: Part{Type: "text/plain", Content: "the body"},
	}
	msgText = Message{
		From:    "mjl <mjl@mox.example>",
		To:      "mox <mox@other.example>",
		Subject: "text message",
		Part:    Part{Type: "text/plain; charset=utf-8", Content: "the body"},
	}
	msgHTML = Message{
		From:    "mjl <mjl@mox.example>",
		To:      "mox <mox@other.example>",
		Subject: "html message",
		Headers: [][2]string{{"List-Id", "test <list.mox.example>"}},
		Part:    Part{Type: "text/html", Content: `<html>the body <img src="cid:img1@mox.example" /></html>`},
	}
	msgAlt = Message{
		From:      "mjl <mjl@mox.example>",
		To:        "mox <mox@other.example>",
		Subject:   "test",
		MessageID: "<alt@localhost>",
		Headers:   [][2]string{{"In-Reply-To", "<previous@host.example>"}},
		Part: Part{
			Type: "multipart/alternative",
			Parts: []Part{
				{Type: "text/plain", Content: "the body"},
				{Type: "text/html; charset=utf-8", Content: `<html>the body <img src="cid:img1@mox.example" /></html>`},
			},
		},
	}
	msgAltReply = Message{
		Subject:    "Re: test",
		References: "<alt@localhost>",
		Part:       Part{Type: "text/plain", Content: "reply to alt"},
	}
	msgAltRel = Message{
		From:    "mjl <mjl+altrel@mox.example>",
		To:      "mox <mox+altrel@other.example>",
		Subject: "test with alt and rel",
		Headers: [][2]string{{"X-Special", "testing"}},
		Part: Part{
			Type: "multipart/alternative",
			Parts: []Part{
				{Type: "text/plain", Content: "the text body"},
				{
					Type: "multipart/related",
					Parts: []Part{
						{
							Type:    "text/html; charset=utf-8",
							Content: `<html>the body <img src="cid:img1@mox.example" /></html>`,
						},
						{Type: `image/png`, Disposition: `inline; filename="test1.png"`, ID: "<img1@mox.example>", Content: `PNG...`, TransferEncoding: "base64"},
					},
				},
			},
		},
	}
	msgAttachments = Message{
		From:    "mjl <mjl@mox.example>",
		To:      "mox <mox@other.example>",
		Subject: "test",
		Part: Part{
			Type: "multipart/mixed",
			Parts: []Part{
				{Type: "text/plain", Content: "the body"},
				{Type: "image/png", TransferEncoding: "base64", Content: `PNG...`},
				{Type: "image/png", TransferEncoding: "base64", Content: `PNG...`},
				{Type: `image/jpg; name="test.jpg"`, TransferEncoding: "base64", Content: `JPG...`},
				{Type: `image/jpg`, Disposition: `attachment; filename="test.jpg"`, TransferEncoding: "base64", Content: `JPG...`},
			},
		},
	}
)

// Import test messages messages.
type testmsg struct {
	Mailbox  string
	Flags    store.Flags
	Keywords []string
	msg      Message
	m        store.Message // As delivered.
	ID       int64         // Shortcut for m.ID
}

func tdeliver(t *testing.T, acc *store.Account, tm *testmsg) {
	msgFile, err := store.CreateMessageTemp(pkglog, "webmail-test")
	tcheck(t, err, "create message temp")
	defer os.Remove(msgFile.Name())
	defer msgFile.Close()
	size, err := msgFile.Write(tm.msg.Marshal(t))
	tcheck(t, err, "write message temp")
	m := store.Message{
		Flags:            tm.Flags,
		RcptToLocalpart:  "mox",
		RcptToDomain:     "other.example",
		MsgFromLocalpart: "mjl",
		MsgFromDomain:    "mox.example",
		DKIMDomains:      []string{"mox.example"},
		Keywords:         tm.Keywords,
		Size:             int64(size),
	}
	err = acc.DeliverMailbox(pkglog, tm.Mailbox, &m, msgFile)
	tcheck(t, err, "deliver test message")
	err = msgFile.Close()
	tcheck(t, err, "closing test message")
	tm.m = m
	tm.ID = m.ID
}

func readBody(r io.Reader) string {
	buf, err := io.ReadAll(r)
	if err != nil {
		return fmt.Sprintf("read error: %s", err)
	}
	return fmt.Sprintf("data: %q", buf)
}

// Test scenario with an account with some mailboxes, messages, then make all
// kinds of changes and we check if we get the right events.
// todo: check more of the results, we currently mostly check http statuses,
// not the returned content.
func TestWebmail(t *testing.T) {
	mox.LimitersInit()
	os.RemoveAll("../testdata/webmail/data")
	mox.Context = ctxbg
	mox.ConfigStaticPath = filepath.FromSlash("../testdata/webmail/mox.conf")
	mox.MustLoadConfig(true, false)
	defer store.Switchboard()()

	acc, err := store.OpenAccount(pkglog, "mjl")
	tcheck(t, err, "open account")
	err = acc.SetPassword(pkglog, "test1234")
	tcheck(t, err, "set password")
	defer func() {
		err := acc.Close()
		pkglog.Check(err, "closing account")
		acc.CheckClosed()
	}()

	api := Webmail{maxMessageSize: 1024 * 1024, cookiePath: "/webmail/"}
	apiHandler, err := makeSherpaHandler(api.maxMessageSize, api.cookiePath, false)
	tcheck(t, err, "sherpa handler")

	respRec := httptest.NewRecorder()
	reqInfo := requestInfo{"", "", "", respRec, &http.Request{RemoteAddr: "127.0.0.1:1234"}}
	ctx := context.WithValue(ctxbg, requestInfoCtxKey, reqInfo)

	// Prepare loginToken.
	loginCookie := &http.Cookie{Name: "webmaillogin"}
	loginCookie.Value = api.LoginPrep(ctx)
	reqInfo.Request.Header = http.Header{"Cookie": []string{loginCookie.String()}}

	csrfToken := api.Login(ctx, loginCookie.Value, "mjl@mox.example", "test1234")
	var sessionCookie *http.Cookie
	for _, c := range respRec.Result().Cookies() {
		if c.Name == "webmailsession" {
			sessionCookie = c
			break
		}
	}
	if sessionCookie == nil {
		t.Fatalf("missing session cookie")
	}

	reqInfo = requestInfo{"mjl@mox.example", "mjl", "", respRec, &http.Request{RemoteAddr: "127.0.0.1:1234"}}
	ctx = context.WithValue(ctxbg, requestInfoCtxKey, reqInfo)

	tneedError(t, func() { api.MailboxCreate(ctx, "Inbox") })   // Cannot create inbox.
	tneedError(t, func() { api.MailboxCreate(ctx, "Archive") }) // Already exists.
	api.MailboxCreate(ctx, "Testbox1")
	api.MailboxCreate(ctx, "Lists/Go/Nuts") // Creates hierarchy.

	var zerom store.Message
	var (
		inboxMinimal     = &testmsg{"Inbox", store.Flags{}, nil, msgMinimal, zerom, 0}
		inboxText        = &testmsg{"Inbox", store.Flags{}, nil, msgText, zerom, 0}
		inboxHTML        = &testmsg{"Inbox", store.Flags{}, nil, msgHTML, zerom, 0}
		inboxAlt         = &testmsg{"Inbox", store.Flags{}, nil, msgAlt, zerom, 0}
		inboxAltRel      = &testmsg{"Inbox", store.Flags{}, nil, msgAltRel, zerom, 0}
		inboxAttachments = &testmsg{"Inbox", store.Flags{}, nil, msgAttachments, zerom, 0}
		testbox1Alt      = &testmsg{"Testbox1", store.Flags{}, nil, msgAlt, zerom, 0}
		rejectsMinimal   = &testmsg{"Rejects", store.Flags{Junk: true}, nil, msgMinimal, zerom, 0}
	)
	var testmsgs = []*testmsg{inboxMinimal, inboxText, inboxHTML, inboxAlt, inboxAltRel, inboxAttachments, testbox1Alt, rejectsMinimal}

	for _, tm := range testmsgs {
		tdeliver(t, acc, tm)
	}

	type httpHeaders [][2]string
	ctHTML := [2]string{"Content-Type", "text/html; charset=utf-8"}
	ctText := [2]string{"Content-Type", "text/plain; charset=utf-8"}
	ctTextNoCharset := [2]string{"Content-Type", "text/plain"}
	ctJS := [2]string{"Content-Type", "application/javascript; charset=utf-8"}
	ctJSON := [2]string{"Content-Type", "application/json; charset=utf-8"}

	cookieOK := &http.Cookie{Name: "webmailsession", Value: sessionCookie.Value}
	cookieBad := &http.Cookie{Name: "webmailsession", Value: "AAAAAAAAAAAAAAAAAAAAAA mjl"}
	hdrSessionOK := [2]string{"Cookie", cookieOK.String()}
	hdrSessionBad := [2]string{"Cookie", cookieBad.String()}
	hdrCSRFOK := [2]string{"x-mox-csrf", string(csrfToken)}
	hdrCSRFBad := [2]string{"x-mox-csrf", "AAAAAAAAAAAAAAAAAAAAAA"}

	testHTTP := func(method, path string, headers httpHeaders, expStatusCode int, expHeaders httpHeaders, check func(resp *http.Response)) {
		t.Helper()

		req := httptest.NewRequest(method, path, nil)
		for _, kv := range headers {
			req.Header.Add(kv[0], kv[1])
		}
		rr := httptest.NewRecorder()
		rr.Body = &bytes.Buffer{}
		handle(apiHandler, false, "", rr, req)
		if rr.Code != expStatusCode {
			t.Fatalf("got status %d, expected %d (%s)", rr.Code, expStatusCode, readBody(rr.Body))
		}

		resp := rr.Result()
		for _, h := range expHeaders {
			if resp.Header.Get(h[0]) != h[1] {
				t.Fatalf("for header %q got value %q, expected %q", h[0], resp.Header.Get(h[0]), h[1])
			}
		}

		if check != nil {
			check(resp)
		}
	}
	testHTTPAuthAPI := func(method, path string, expStatusCode int, expHeaders httpHeaders, check func(resp *http.Response)) {
		t.Helper()
		testHTTP(method, path, httpHeaders{hdrCSRFOK, hdrSessionOK}, expStatusCode, expHeaders, check)
	}
	testHTTPAuthREST := func(method, path string, expStatusCode int, expHeaders httpHeaders, check func(resp *http.Response)) {
		t.Helper()
		testHTTP(method, path, httpHeaders{hdrSessionOK}, expStatusCode, expHeaders, check)
	}

	userAuthError := func(resp *http.Response, expCode string) {
		t.Helper()

		var response struct {
			Error *sherpa.Error `json:"error"`
		}
		err := json.NewDecoder(resp.Body).Decode(&response)
		tcheck(t, err, "parsing response as json")
		if response.Error == nil {
			t.Fatalf("expected sherpa error with code %s, no error", expCode)
		}
		if response.Error.Code != expCode {
			t.Fatalf("got sherpa error code %q, expected %s", response.Error.Code, expCode)
		}
	}
	badAuth := func(resp *http.Response) {
		t.Helper()
		userAuthError(resp, "user:badAuth")
	}
	noAuth := func(resp *http.Response) {
		t.Helper()
		userAuthError(resp, "user:noAuth")
	}

	// HTTP webmail
	testHTTP("GET", "/", httpHeaders{}, http.StatusOK, nil, nil)
	testHTTP("POST", "/", httpHeaders{}, http.StatusMethodNotAllowed, nil, nil)
	testHTTP("GET", "/", httpHeaders{[2]string{"Accept-Encoding", "gzip"}}, http.StatusOK, httpHeaders{ctHTML, [2]string{"Content-Encoding", "gzip"}}, nil)
	testHTTP("GET", "/msg.js", httpHeaders{}, http.StatusOK, httpHeaders{ctJS}, nil)
	testHTTP("POST", "/msg.js", httpHeaders{}, http.StatusMethodNotAllowed, nil, nil)
	testHTTP("GET", "/text.js", httpHeaders{}, http.StatusOK, httpHeaders{ctJS}, nil)
	testHTTP("POST", "/text.js", httpHeaders{}, http.StatusMethodNotAllowed, nil, nil)

	testHTTP("POST", "/api/Bogus", httpHeaders{}, http.StatusOK, nil, noAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrCSRFBad}, http.StatusOK, nil, noAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrSessionBad}, http.StatusOK, nil, noAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrCSRFBad, hdrSessionBad}, http.StatusOK, nil, badAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrCSRFOK}, http.StatusOK, nil, noAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrSessionOK}, http.StatusOK, nil, noAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrCSRFBad, hdrSessionOK}, http.StatusOK, nil, badAuth)
	testHTTP("POST", "/api/Bogus", httpHeaders{hdrCSRFOK, hdrSessionBad}, http.StatusOK, nil, badAuth)
	testHTTPAuthAPI("GET", "/api/Bogus", http.StatusMethodNotAllowed, nil, nil)
	testHTTPAuthAPI("POST", "/api/Bogus", http.StatusNotFound, nil, nil)
	testHTTPAuthAPI("POST", "/api/SSETypes", http.StatusOK, httpHeaders{ctJSON}, nil)

	// Unknown.
	testHTTP("GET", "/other", httpHeaders{}, http.StatusForbidden, nil, nil)

	// HTTP message, generic
	testHTTP("GET", fmt.Sprintf("/msg/%v/attachments.zip", inboxMinimal.ID), nil, http.StatusForbidden, nil, nil)
	testHTTP("GET", fmt.Sprintf("/msg/%v/attachments.zip", inboxMinimal.ID), httpHeaders{hdrCSRFBad}, http.StatusForbidden, nil, nil)
	testHTTP("GET", fmt.Sprintf("/msg/%v/attachments.zip", inboxMinimal.ID), httpHeaders{hdrCSRFOK}, http.StatusForbidden, nil, nil)
	testHTTP("GET", fmt.Sprintf("/msg/%v/attachments.zip", inboxMinimal.ID), httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)
	testHTTPAuthREST("GET", fmt.Sprintf("/msg/%v/attachments.zip", 0), http.StatusNotFound, nil, nil)
	testHTTPAuthREST("GET", fmt.Sprintf("/msg/%v/attachments.zip", testmsgs[len(testmsgs)-1].ID+1), http.StatusNotFound, nil, nil)
	testHTTPAuthREST("GET", fmt.Sprintf("/msg/%v/bogus", inboxMinimal.ID), http.StatusNotFound, nil, nil)
	testHTTPAuthREST("GET", fmt.Sprintf("/msg/%v/view/bogus", inboxMinimal.ID), http.StatusNotFound, nil, nil)
	testHTTPAuthREST("GET", fmt.Sprintf("/msg/%v/bogus/0", inboxMinimal.ID), http.StatusNotFound, nil, nil)
	testHTTPAuthREST("GET", "/msg/", http.StatusNotFound, nil, nil)
	testHTTPAuthREST("POST", fmt.Sprintf("/msg/%v/attachments.zip", inboxMinimal.ID), http.StatusMethodNotAllowed, nil, nil)

	// HTTP message: attachments.zip
	ctZip := [2]string{"Content-Type", "application/zip"}
	checkZip := func(resp *http.Response, fileContents [][2]string) {
		t.Helper()
		zipbuf, err := io.ReadAll(resp.Body)
		tcheck(t, err, "reading response")
		zr, err := zip.NewReader(bytes.NewReader(zipbuf), int64(len(zipbuf)))
		tcheck(t, err, "open zip")
		if len(fileContents) != len(zr.File) {
			t.Fatalf("zip file has %d files, expected %d", len(fileContents), len(zr.File))
		}
		for i, fc := range fileContents {
			if zr.File[i].Name != fc[0] {
				t.Fatalf("zip, file at index %d is named %q, expected %q", i, zr.File[i].Name, fc[0])
			}
			f, err := zr.File[i].Open()
			tcheck(t, err, "open file in zip")
			buf, err := io.ReadAll(f)
			tcheck(t, err, "read file in zip")
			tcompare(t, string(buf), fc[1])
			err = f.Close()
			tcheck(t, err, "closing file")
		}
	}

	pathInboxMinimal := fmt.Sprintf("/msg/%d", inboxMinimal.ID)
	testHTTP("GET", pathInboxMinimal+"/attachments.zip", httpHeaders{}, http.StatusForbidden, nil, nil)
	testHTTP("GET", pathInboxMinimal+"/attachments.zip", httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)

	testHTTPAuthREST("GET", pathInboxMinimal+"/attachments.zip", http.StatusOK, httpHeaders{ctZip}, func(resp *http.Response) {
		checkZip(resp, nil)
	})
	pathInboxRelAlt := fmt.Sprintf("/msg/%d", inboxAltRel.ID)
	testHTTPAuthREST("GET", pathInboxRelAlt+"/attachments.zip", http.StatusOK, httpHeaders{ctZip}, func(resp *http.Response) {
		checkZip(resp, [][2]string{{"test1.png", "PNG..."}})
	})
	pathInboxAttachments := fmt.Sprintf("/msg/%d", inboxAttachments.ID)
	testHTTPAuthREST("GET", pathInboxAttachments+"/attachments.zip", http.StatusOK, httpHeaders{ctZip}, func(resp *http.Response) {
		checkZip(resp, [][2]string{{"attachment-1.png", "PNG..."}, {"attachment-2.png", "PNG..."}, {"test.jpg", "JPG..."}, {"test-1.jpg", "JPG..."}})
	})

	// HTTP message: raw
	pathInboxAltRel := fmt.Sprintf("/msg/%d", inboxAltRel.ID)
	pathInboxText := fmt.Sprintf("/msg/%d", inboxText.ID)
	testHTTP("GET", pathInboxAltRel+"/raw", httpHeaders{}, http.StatusForbidden, nil, nil)
	testHTTP("GET", pathInboxAltRel+"/raw", httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/raw", http.StatusOK, httpHeaders{ctTextNoCharset}, nil)
	testHTTPAuthREST("GET", pathInboxText+"/raw", http.StatusOK, httpHeaders{ctText}, nil)

	// HTTP message: parsedmessage.js
	testHTTP("GET", pathInboxMinimal+"/parsedmessage.js", httpHeaders{}, http.StatusForbidden, nil, nil)
	testHTTP("GET", pathInboxMinimal+"/parsedmessage.js", httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)
	testHTTPAuthREST("GET", pathInboxMinimal+"/parsedmessage.js", http.StatusOK, httpHeaders{ctJS}, nil)

	mox.LimitersInit()
	// HTTP message: text,html,htmlexternal and msgtext,msghtml,msghtmlexternal
	for _, elem := range []string{"text", "html", "htmlexternal", "msgtext", "msghtml", "msghtmlexternal"} {
		testHTTP("GET", pathInboxAltRel+"/"+elem, httpHeaders{}, http.StatusForbidden, nil, nil)
		testHTTP("GET", pathInboxAltRel+"/"+elem, httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)
		mox.LimitersInit() // Reset, for too many failures.
	}

	// The text endpoint serves JS that we generated, so should be safe, but still doesn't hurt to have a CSP.
	cspText := [2]string{
		"Content-Security-Policy",
		"frame-ancestors 'self'; default-src 'none'; img-src data:; style-src 'unsafe-inline'; script-src 'unsafe-inline' 'self'; frame-src 'self'; connect-src 'self'",
	}
	// Text and img-src 'self', for viewing image files inline.
	cspTextImg := [2]string{
		"Content-Security-Policy",
		"frame-ancestors 'self'; default-src 'none'; img-src data: 'self'; style-src 'unsafe-inline'; script-src 'unsafe-inline' 'self'; frame-src 'self'; connect-src 'self'",
	}
	// HTML as viewed in the regular viewer, not in a new tab.
	cspHTML := [2]string{
		"Content-Security-Policy",
		"sandbox allow-popups allow-popups-to-escape-sandbox; frame-ancestors 'self'; default-src 'none'; img-src data:; style-src 'unsafe-inline'",
	}
	// HTML when in separate message tab, needs allow-same-origin for iframe inner height.
	cspHTMLSameOrigin := [2]string{
		"Content-Security-Policy",
		"sandbox allow-popups allow-popups-to-escape-sandbox allow-same-origin; frame-ancestors 'self'; default-src 'none'; img-src data:; style-src 'unsafe-inline'",
	}
	// Like cspHTML, but allows http and https resources.
	cspHTMLExternal := [2]string{
		"Content-Security-Policy",
		"sandbox allow-popups allow-popups-to-escape-sandbox; frame-ancestors 'self'; default-src 'none'; img-src data: http: https: 'unsafe-inline'; style-src 'unsafe-inline' data: http: https:; font-src data: http: https: 'unsafe-inline'; media-src 'unsafe-inline' data: http: https:",
	}
	// HTML with external resources when opened in separate tab, with allow-same-origin for iframe inner height.
	cspHTMLExternalSameOrigin := [2]string{
		"Content-Security-Policy",
		"sandbox allow-popups allow-popups-to-escape-sandbox allow-same-origin; frame-ancestors 'self'; default-src 'none'; img-src data: http: https: 'unsafe-inline'; style-src 'unsafe-inline' data: http: https:; font-src data: http: https: 'unsafe-inline'; media-src 'unsafe-inline' data: http: https:",
	}
	// Msg page, our JS, that loads an html iframe, already blocks access for the iframe.
	cspMsgHTML := [2]string{
		"Content-Security-Policy",
		"frame-ancestors 'self'; default-src 'none'; img-src data:; style-src 'unsafe-inline'; script-src 'unsafe-inline' 'self'; frame-src 'self'; connect-src 'self'",
	}
	// Msg page that already allows external resources for the iframe.
	cspMsgHTMLExternal := [2]string{
		"Content-Security-Policy",
		"frame-ancestors 'self'; default-src 'none'; img-src data: http: https: 'unsafe-inline'; style-src 'unsafe-inline' data: http: https:; font-src data: http: https: 'unsafe-inline'; media-src 'unsafe-inline' data: http: https:; script-src 'unsafe-inline' 'self'; frame-src 'self'; connect-src 'self'",
	}
	testHTTPAuthREST("GET", pathInboxAltRel+"/text", http.StatusOK, httpHeaders{ctHTML, cspTextImg}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/html", http.StatusOK, httpHeaders{ctHTML, cspHTML}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/htmlexternal", http.StatusOK, httpHeaders{ctHTML, cspHTMLExternal}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/msgtext", http.StatusOK, httpHeaders{ctHTML, cspText}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/msghtml", http.StatusOK, httpHeaders{ctHTML, cspMsgHTML}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/msghtmlexternal", http.StatusOK, httpHeaders{ctHTML, cspMsgHTMLExternal}, nil)

	testHTTPAuthREST("GET", pathInboxAltRel+"/html?sameorigin=true", http.StatusOK, httpHeaders{ctHTML, cspHTMLSameOrigin}, nil)
	testHTTPAuthREST("GET", pathInboxAltRel+"/htmlexternal?sameorigin=true", http.StatusOK, httpHeaders{ctHTML, cspHTMLExternalSameOrigin}, nil)

	// No HTML part.
	for _, elem := range []string{"html", "htmlexternal", "msghtml", "msghtmlexternal"} {
		testHTTPAuthREST("GET", pathInboxText+"/"+elem, http.StatusBadRequest, nil, nil)

	}
	// No text part.
	pathInboxHTML := fmt.Sprintf("/msg/%d", inboxHTML.ID)
	for _, elem := range []string{"text", "msgtext"} {
		testHTTPAuthREST("GET", pathInboxHTML+"/"+elem, http.StatusBadRequest, nil, nil)
	}

	// HTTP message part: view,viewtext,download
	for _, elem := range []string{"view", "viewtext", "download"} {
		testHTTP("GET", pathInboxAltRel+"/"+elem+"/0", httpHeaders{}, http.StatusForbidden, nil, nil)
		testHTTP("GET", pathInboxAltRel+"/"+elem+"/0", httpHeaders{hdrSessionBad}, http.StatusForbidden, nil, nil)
		testHTTPAuthREST("GET", pathInboxAltRel+"/"+elem+"/0", http.StatusOK, nil, nil)
		testHTTPAuthREST("GET", pathInboxAltRel+"/"+elem+"/0.0", http.StatusOK, nil, nil)
		testHTTPAuthREST("GET", pathInboxAltRel+"/"+elem+"/0.1", http.StatusOK, nil, nil)
		testHTTPAuthREST("GET", pathInboxAltRel+"/"+elem+"/0.2", http.StatusNotFound, nil, nil)
		testHTTPAuthREST("GET", pathInboxAltRel+"/"+elem+"/1", http.StatusNotFound, nil, nil)
	}

	// Logout invalidates the session. Must work exactly once.
	// Normally the generic /api/ auth check returns a user error. We bypass it and
	// check for the server error.
	sessionToken := store.SessionToken(strings.SplitN(sessionCookie.Value, " ", 2)[0])
	reqInfo = requestInfo{"mjl@mox.example", "mjl", sessionToken, httptest.NewRecorder(), &http.Request{RemoteAddr: "127.0.0.1:1234"}}
	ctx = context.WithValue(ctxbg, requestInfoCtxKey, reqInfo)
	api.Logout(ctx)
	tneedErrorCode(t, "server:error", func() { api.Logout(ctx) })
}

func TestSanitize(t *testing.T) {
	check := func(s string, exp string) {
		t.Helper()
		n, err := html.Parse(strings.NewReader(s))
		tcheck(t, err, "parsing html")
		sanitizeNode(n)
		var sb strings.Builder
		err = html.Render(&sb, n)
		tcheck(t, err, "writing html")
		if sb.String() != exp {
			t.Fatalf("sanitizing html: %s\ngot: %s\nexpected: %s", s, sb.String(), exp)
		}
	}

	check(``,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body></body></html>`)
	check(`<script>read localstorage</script>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body></body></html>`)
	check(`<a href="javascript:evil">click me</a>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body><a target="_blank" rel="noopener noreferrer">click me</a></body></html>`)
	check(`<a href="https://badsite" target="top">click me</a>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body><a href="https://badsite" target="_blank" rel="noopener noreferrer">click me</a></body></html>`)
	check(`<a xlink:href="https://badsite">click me</a>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body><a xlink:href="https://badsite" target="_blank" rel="noopener noreferrer">click me</a></body></html>`)
	check(`<a onclick="evil">click me</a>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body><a target="_blank" rel="noopener noreferrer">click me</a></body></html>`)
	check(`<iframe src="data:text/html;base64,evilhtml"></iframe>`,
		`<html><head><base target="_blank" rel="noopener noreferrer"/></head><body><iframe></iframe></body></html>`)
}