mirror of
https://github.com/ChronosX88/yans.git
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Implement ARTICLE command
This commit is contained in:
parent
496fbf2a4f
commit
57bd1e0eb5
@ -20,7 +20,7 @@
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- :heavy_check_mark: `LIST NEWSGROUPS`
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- :heavy_check_mark: `MODE READER`
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- :heavy_check_mark: `QUIT`
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- :x: `ARTICLE`
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- :heavy_check_mark: `ARTICLE`
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- :x: `BODY`
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- :heavy_check_mark: `GROUP`
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- :x: `HDR`
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@ -129,7 +129,15 @@ func (sb *SQLiteBackend) SaveArticle(a models.Article, groups []string) error {
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func (sb *SQLiteBackend) GetArticle(messageID string) (models.Article, error) {
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var a models.Article
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if err := sb.db.Get(&a, "SELECT * FROM articles WHERE json_extract(articles.header, '$.Message-ID[0]') = ?", messageID); err != nil {
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if err := sb.db.Get(&a, "SELECT * FROM articles WHERE json_extract(articles.header, '$.Message-Id[0]') = ?", messageID); err != nil {
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return a, err
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}
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return a, json.Unmarshal([]byte(a.HeaderRaw), &a.Header)
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}
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func (sb *SQLiteBackend) GetArticleByNumber(g *models.Group, num int) (models.Article, error) {
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var a models.Article
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if err := sb.db.Get(&a, "SELECT articles.* FROM articles INNER JOIN articles_to_groups atg on atg.article_id = articles.id WHERE atg.article_number = ? AND atg.group_id = ?", num, g.ID); err != nil {
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return a, err
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}
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return a, json.Unmarshal([]byte(a.HeaderRaw), &a.Header)
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@ -16,5 +16,6 @@ type StorageBackend interface {
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GetGroupHighWaterMark(g *models.Group) (int, error)
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SaveArticle(article models.Article, groups []string) error
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GetArticle(messageID string) (models.Article, error)
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GetArticleByNumber(g *models.Group, num int) (models.Article, error)
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GetArticleNumbers(g *models.Group, low, high int64) ([]int64, error)
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}
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@ -56,6 +56,7 @@ const (
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CommandNewGroups = "NEWGROUPS"
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CommandPost = "POST"
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CommandListGroup = "LISTGROUP"
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CommandArticle = "ARTICLE"
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)
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const (
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@ -35,6 +35,7 @@ func NewHandler(b backend.StorageBackend, serverDomain string) *Handler {
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protocol.CommandNewGroups: h.handleNewGroups,
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protocol.CommandPost: h.handlePost,
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protocol.CommandListGroup: h.handleListgroup,
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protocol.CommandArticle: h.handleArticle,
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}
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h.serverDomain = serverDomain
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return h
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@ -274,13 +275,10 @@ func (h *Handler) handlePost(s *Session, arguments []string, id uint) error {
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if err != nil {
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return err
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}
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if err != nil {
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return err
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}
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// generate message id
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messageID := fmt.Sprintf("<%s@%s>", uuid.New().String(), h.serverDomain)
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headers["Message-ID"] = []string{messageID}
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headers.Set("Message-ID", messageID)
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headerJson, err := json.Marshal(headers)
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if err != nil {
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@ -387,6 +385,76 @@ func (h *Handler) handleListgroup(s *Session, arguments []string, id uint) error
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return dw.Close()
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}
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func (h *Handler) handleArticle(s *Session, arguments []string, id uint) error {
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s.tconn.StartResponse(id)
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defer s.tconn.EndResponse(id)
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if len(arguments) == 0 && s.currentArticle == nil {
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return s.tconn.PrintfLine(protocol.NNTPResponse{Code: 420, Message: "No current article selected"}.String())
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}
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if len(arguments) > 1 {
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return s.tconn.PrintfLine(protocol.ErrSyntaxError.String())
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}
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getByArticleNum := true
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num, err := strconv.Atoi(arguments[0])
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if err != nil {
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getByArticleNum = false
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}
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if getByArticleNum && s.currentGroup == nil {
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return s.tconn.PrintfLine(protocol.NNTPResponse{Code: 412, Message: "No newsgroup selected"}.String())
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}
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var a models.Article
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if getByArticleNum {
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a, err = h.backend.GetArticleByNumber(s.currentGroup, num)
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if err != nil {
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if err == sql.ErrNoRows {
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return s.tconn.PrintfLine(protocol.NNTPResponse{Code: 423, Message: "No article with that number"}.String())
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} else {
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return err
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}
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}
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} else {
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a, err = h.backend.GetArticle(arguments[0])
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if err != nil {
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if err == sql.ErrNoRows {
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return s.tconn.PrintfLine(protocol.NNTPResponse{Code: 430, Message: "No Such Article Found"}.String())
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} else {
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return err
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}
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}
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}
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s.currentArticle = &a
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err = json.Unmarshal([]byte(a.HeaderRaw), &a.Header)
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if err != nil {
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return err
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}
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m := utils.NewMessage()
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for k, v := range a.Header {
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m.SetHeader(k, v...)
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}
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m.SetBody("text/plain", a.Body) // FIXME currently only plain text is supported
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dw := s.tconn.DotWriter()
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_, err = dw.Write([]byte(protocol.NNTPResponse{Code: 220, Message: fmt.Sprintf("%d %s", num, a.Header.Get("Message-ID"))}.String() + protocol.CRLF))
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if err != nil {
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return err
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}
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_, err = m.WriteTo(dw)
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if err != nil {
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return err
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}
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return dw.Close()
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}
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func (h *Handler) Handle(s *Session, message string, id uint) error {
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splittedMessage := strings.Split(message, " ")
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for i, v := range splittedMessage {
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@ -28,6 +28,7 @@ type Session struct {
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h *Handler
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currentGroup *models.Group
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currentArticle *models.Article
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mode SessionMode
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}
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635
internal/utils/message.go
Normal file
635
internal/utils/message.go
Normal file
@ -0,0 +1,635 @@
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package utils
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// this package has been kindly taken from https://github.com/go-gomail/gomail
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// licensed under MIT license
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// Copyright (c) 2014 Alexandre Cesaro
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import (
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"bytes"
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"encoding/base64"
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"io"
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"mime"
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"mime/multipart"
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"mime/quotedprintable"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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var newQPWriter = quotedprintable.NewWriter
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type mimeEncoder struct {
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mime.WordEncoder
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}
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var (
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bEncoding = mimeEncoder{mime.BEncoding}
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qEncoding = mimeEncoder{mime.QEncoding}
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lastIndexByte = strings.LastIndexByte
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)
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// Message represents an email.
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type Message struct {
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header header
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parts []*part
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attachments []*file
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embedded []*file
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charset string
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encoding Encoding
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hEncoder mimeEncoder
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buf bytes.Buffer
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}
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type header map[string][]string
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type part struct {
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contentType string
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copier func(io.Writer) error
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encoding Encoding
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}
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// NewMessage creates a new message. It uses UTF-8 and quoted-printable encoding
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// by default.
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func NewMessage(settings ...MessageSetting) *Message {
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m := &Message{
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header: make(header),
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charset: "UTF-8",
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encoding: QuotedPrintable,
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}
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m.applySettings(settings)
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if m.encoding == Base64 {
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m.hEncoder = bEncoding
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} else {
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m.hEncoder = qEncoding
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}
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return m
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}
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// Reset resets the message so it can be reused. The message keeps its previous
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// settings so it is in the same state that after a call to NewMessage.
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func (m *Message) Reset() {
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for k := range m.header {
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delete(m.header, k)
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}
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m.parts = nil
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m.attachments = nil
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m.embedded = nil
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}
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func (m *Message) applySettings(settings []MessageSetting) {
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for _, s := range settings {
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s(m)
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}
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}
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// A MessageSetting can be used as an argument in NewMessage to configure an
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// email.
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type MessageSetting func(m *Message)
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// SetCharset is a message setting to set the charset of the email.
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func SetCharset(charset string) MessageSetting {
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return func(m *Message) {
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m.charset = charset
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}
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}
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// SetEncoding is a message setting to set the encoding of the email.
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func SetEncoding(enc Encoding) MessageSetting {
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return func(m *Message) {
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m.encoding = enc
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}
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}
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// Encoding represents a MIME encoding scheme like quoted-printable or base64.
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type Encoding string
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const (
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// QuotedPrintable represents the quoted-printable encoding as defined in
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// RFC 2045.
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QuotedPrintable Encoding = "quoted-printable"
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// Base64 represents the base64 encoding as defined in RFC 2045.
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Base64 Encoding = "base64"
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// Unencoded can be used to avoid encoding the body of an email. The headers
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// will still be encoded using quoted-printable encoding.
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Unencoded Encoding = "8bit"
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)
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// SetHeader sets a value to the given header field.
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func (m *Message) SetHeader(field string, value ...string) {
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m.encodeHeader(value)
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m.header[field] = value
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}
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func (m *Message) encodeHeader(values []string) {
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for i := range values {
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values[i] = m.encodeString(values[i])
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}
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}
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func (m *Message) encodeString(value string) string {
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return m.hEncoder.Encode(m.charset, value)
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}
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// SetHeaders sets the message headers.
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func (m *Message) SetHeaders(h map[string][]string) {
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for k, v := range h {
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m.SetHeader(k, v...)
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}
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}
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// SetAddressHeader sets an address to the given header field.
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func (m *Message) SetAddressHeader(field, address, name string) {
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m.header[field] = []string{m.FormatAddress(address, name)}
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}
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// FormatAddress formats an address and a name as a valid RFC 5322 address.
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func (m *Message) FormatAddress(address, name string) string {
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if name == "" {
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return address
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}
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enc := m.encodeString(name)
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if enc == name {
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m.buf.WriteByte('"')
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for i := 0; i < len(name); i++ {
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b := name[i]
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if b == '\\' || b == '"' {
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m.buf.WriteByte('\\')
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}
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m.buf.WriteByte(b)
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}
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m.buf.WriteByte('"')
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} else if hasSpecials(name) {
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m.buf.WriteString(bEncoding.Encode(m.charset, name))
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} else {
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m.buf.WriteString(enc)
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}
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m.buf.WriteString(" <")
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m.buf.WriteString(address)
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m.buf.WriteByte('>')
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addr := m.buf.String()
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m.buf.Reset()
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return addr
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}
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func hasSpecials(text string) bool {
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for i := 0; i < len(text); i++ {
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switch c := text[i]; c {
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case '(', ')', '<', '>', '[', ']', ':', ';', '@', '\\', ',', '.', '"':
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return true
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}
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}
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return false
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}
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// SetDateHeader sets a date to the given header field.
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func (m *Message) SetDateHeader(field string, date time.Time) {
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m.header[field] = []string{m.FormatDate(date)}
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}
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// FormatDate formats a date as a valid RFC 5322 date.
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func (m *Message) FormatDate(date time.Time) string {
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return date.Format(time.RFC1123Z)
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}
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// GetHeader gets a header field.
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func (m *Message) GetHeader(field string) []string {
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return m.header[field]
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}
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// SetBody sets the body of the message. It replaces any content previously set
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// by SetBody, AddAlternative or AddAlternativeWriter.
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func (m *Message) SetBody(contentType, body string, settings ...PartSetting) {
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m.parts = []*part{m.newPart(contentType, newCopier(body), settings)}
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}
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// AddAlternative adds an alternative part to the message.
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//
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// It is commonly used to send HTML emails that default to the plain text
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// version for backward compatibility. AddAlternative appends the new part to
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// the end of the message. So the plain text part should be added before the
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// HTML part. See http://en.wikipedia.org/wiki/MIME#Alternative
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func (m *Message) AddAlternative(contentType, body string, settings ...PartSetting) {
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m.AddAlternativeWriter(contentType, newCopier(body), settings...)
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}
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func newCopier(s string) func(io.Writer) error {
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return func(w io.Writer) error {
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_, err := io.WriteString(w, s)
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return err
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}
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}
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// AddAlternativeWriter adds an alternative part to the message. It can be
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// useful with the text/template or html/template packages.
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func (m *Message) AddAlternativeWriter(contentType string, f func(io.Writer) error, settings ...PartSetting) {
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m.parts = append(m.parts, m.newPart(contentType, f, settings))
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}
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func (m *Message) newPart(contentType string, f func(io.Writer) error, settings []PartSetting) *part {
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p := &part{
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contentType: contentType,
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copier: f,
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encoding: m.encoding,
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}
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for _, s := range settings {
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s(p)
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}
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return p
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}
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// A PartSetting can be used as an argument in Message.SetBody,
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// Message.AddAlternative or Message.AddAlternativeWriter to configure the part
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// added to a message.
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type PartSetting func(*part)
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// SetPartEncoding sets the encoding of the part added to the message. By
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// default, parts use the same encoding than the message.
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func SetPartEncoding(e Encoding) PartSetting {
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return PartSetting(func(p *part) {
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p.encoding = e
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})
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}
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type file struct {
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Name string
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Header map[string][]string
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CopyFunc func(w io.Writer) error
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}
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func (f *file) setHeader(field, value string) {
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f.Header[field] = []string{value}
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}
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// A FileSetting can be used as an argument in Message.Attach or Message.Embed.
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type FileSetting func(*file)
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// SetHeader is a file setting to set the MIME header of the message part that
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// contains the file content.
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//
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// Mandatory headers are automatically added if they are not set when sending
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// the email.
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func SetHeader(h map[string][]string) FileSetting {
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return func(f *file) {
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for k, v := range h {
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f.Header[k] = v
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}
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}
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}
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// Rename is a file setting to set the name of the attachment if the name is
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// different than the filename on disk.
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func Rename(name string) FileSetting {
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return func(f *file) {
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f.Name = name
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}
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}
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// SetCopyFunc is a file setting to replace the function that runs when the
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// message is sent. It should copy the content of the file to the io.Writer.
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//
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// The default copy function opens the file with the given filename, and copy
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// its content to the io.Writer.
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func SetCopyFunc(f func(io.Writer) error) FileSetting {
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return func(fi *file) {
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fi.CopyFunc = f
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}
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}
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func (m *Message) appendFile(list []*file, name string, settings []FileSetting) []*file {
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f := &file{
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Name: filepath.Base(name),
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Header: make(map[string][]string),
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CopyFunc: func(w io.Writer) error {
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h, err := os.Open(name)
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if err != nil {
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return err
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}
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if _, err := io.Copy(w, h); err != nil {
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h.Close()
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return err
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}
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return h.Close()
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},
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}
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for _, s := range settings {
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s(f)
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}
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if list == nil {
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return []*file{f}
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}
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return append(list, f)
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}
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// Attach attaches the files to the email.
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func (m *Message) Attach(filename string, settings ...FileSetting) {
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m.attachments = m.appendFile(m.attachments, filename, settings)
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}
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// Embed embeds the images to the email.
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func (m *Message) Embed(filename string, settings ...FileSetting) {
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m.embedded = m.appendFile(m.embedded, filename, settings)
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}
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// WriteTo implements io.WriterTo. It dumps the whole message into w.
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||||
func (m *Message) WriteTo(w io.Writer) (int64, error) {
|
||||
mw := &messageWriter{w: w}
|
||||
mw.writeMessage(m)
|
||||
return mw.n, mw.err
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeMessage(m *Message) {
|
||||
if _, ok := m.header["Mime-Version"]; !ok {
|
||||
w.writeString("Mime-Version: 1.0\r\n")
|
||||
}
|
||||
if _, ok := m.header["Date"]; !ok {
|
||||
w.writeHeader("Date", m.FormatDate(time.Now()))
|
||||
}
|
||||
w.writeHeaders(m.header)
|
||||
|
||||
if m.hasMixedPart() {
|
||||
w.openMultipart("mixed")
|
||||
}
|
||||
|
||||
if m.hasRelatedPart() {
|
||||
w.openMultipart("related")
|
||||
}
|
||||
|
||||
if m.hasAlternativePart() {
|
||||
w.openMultipart("alternative")
|
||||
}
|
||||
for _, part := range m.parts {
|
||||
w.writePart(part, m.charset)
|
||||
}
|
||||
if m.hasAlternativePart() {
|
||||
w.closeMultipart()
|
||||
}
|
||||
|
||||
w.addFiles(m.embedded, false)
|
||||
if m.hasRelatedPart() {
|
||||
w.closeMultipart()
|
||||
}
|
||||
|
||||
w.addFiles(m.attachments, true)
|
||||
if m.hasMixedPart() {
|
||||
w.closeMultipart()
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Message) hasMixedPart() bool {
|
||||
return (len(m.parts) > 0 && len(m.attachments) > 0) || len(m.attachments) > 1
|
||||
}
|
||||
|
||||
func (m *Message) hasRelatedPart() bool {
|
||||
return (len(m.parts) > 0 && len(m.embedded) > 0) || len(m.embedded) > 1
|
||||
}
|
||||
|
||||
func (m *Message) hasAlternativePart() bool {
|
||||
return len(m.parts) > 1
|
||||
}
|
||||
|
||||
type messageWriter struct {
|
||||
w io.Writer
|
||||
n int64
|
||||
writers [3]*multipart.Writer
|
||||
partWriter io.Writer
|
||||
depth uint8
|
||||
err error
|
||||
}
|
||||
|
||||
func (w *messageWriter) openMultipart(mimeType string) {
|
||||
mw := multipart.NewWriter(w)
|
||||
contentType := "multipart/" + mimeType + ";\r\n boundary=" + mw.Boundary()
|
||||
w.writers[w.depth] = mw
|
||||
|
||||
if w.depth == 0 {
|
||||
w.writeHeader("Content-Type", contentType)
|
||||
w.writeString("\r\n")
|
||||
} else {
|
||||
w.createPart(map[string][]string{
|
||||
"Content-Type": {contentType},
|
||||
})
|
||||
}
|
||||
w.depth++
|
||||
}
|
||||
|
||||
func (w *messageWriter) createPart(h map[string][]string) {
|
||||
w.partWriter, w.err = w.writers[w.depth-1].CreatePart(h)
|
||||
}
|
||||
|
||||
func (w *messageWriter) closeMultipart() {
|
||||
if w.depth > 0 {
|
||||
w.writers[w.depth-1].Close()
|
||||
w.depth--
|
||||
}
|
||||
}
|
||||
|
||||
func (w *messageWriter) writePart(p *part, charset string) {
|
||||
w.writeHeaders(map[string][]string{
|
||||
"Content-Type": {p.contentType + "; charset=" + charset},
|
||||
"Content-Transfer-Encoding": {string(p.encoding)},
|
||||
})
|
||||
w.writeBody(p.copier, p.encoding)
|
||||
}
|
||||
|
||||
func (w *messageWriter) addFiles(files []*file, isAttachment bool) {
|
||||
for _, f := range files {
|
||||
if _, ok := f.Header["Content-Type"]; !ok {
|
||||
mediaType := mime.TypeByExtension(filepath.Ext(f.Name))
|
||||
if mediaType == "" {
|
||||
mediaType = "application/octet-stream"
|
||||
}
|
||||
f.setHeader("Content-Type", mediaType+`; name="`+f.Name+`"`)
|
||||
}
|
||||
|
||||
if _, ok := f.Header["Content-Transfer-Encoding"]; !ok {
|
||||
f.setHeader("Content-Transfer-Encoding", string(Base64))
|
||||
}
|
||||
|
||||
if _, ok := f.Header["Content-Disposition"]; !ok {
|
||||
var disp string
|
||||
if isAttachment {
|
||||
disp = "attachment"
|
||||
} else {
|
||||
disp = "inline"
|
||||
}
|
||||
f.setHeader("Content-Disposition", disp+`; filename="`+f.Name+`"`)
|
||||
}
|
||||
|
||||
if !isAttachment {
|
||||
if _, ok := f.Header["Content-ID"]; !ok {
|
||||
f.setHeader("Content-ID", "<"+f.Name+">")
|
||||
}
|
||||
}
|
||||
w.writeHeaders(f.Header)
|
||||
w.writeBody(f.CopyFunc, Base64)
|
||||
}
|
||||
}
|
||||
|
||||
func (w *messageWriter) Write(p []byte) (int, error) {
|
||||
if w.err != nil {
|
||||
return 0, w.err
|
||||
}
|
||||
|
||||
var n int
|
||||
n, w.err = w.w.Write(p)
|
||||
w.n += int64(n)
|
||||
return n, w.err
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeString(s string) {
|
||||
n, _ := io.WriteString(w.w, s)
|
||||
w.n += int64(n)
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeHeader(k string, v ...string) {
|
||||
w.writeString(k)
|
||||
if len(v) == 0 {
|
||||
w.writeString(":\r\n")
|
||||
return
|
||||
}
|
||||
w.writeString(": ")
|
||||
|
||||
// Max header line length is 78 characters in RFC 5322 and 76 characters
|
||||
// in RFC 2047. So for the sake of simplicity we use the 76 characters
|
||||
// limit.
|
||||
charsLeft := 76 - len(k) - len(": ")
|
||||
|
||||
for i, s := range v {
|
||||
// If the line is already too long, insert a newline right away.
|
||||
if charsLeft < 1 {
|
||||
if i == 0 {
|
||||
w.writeString("\r\n ")
|
||||
} else {
|
||||
w.writeString(",\r\n ")
|
||||
}
|
||||
charsLeft = 75
|
||||
} else if i != 0 {
|
||||
w.writeString(", ")
|
||||
charsLeft -= 2
|
||||
}
|
||||
|
||||
// While the header content is too long, fold it by inserting a newline.
|
||||
for len(s) > charsLeft {
|
||||
s = w.writeLine(s, charsLeft)
|
||||
charsLeft = 75
|
||||
}
|
||||
w.writeString(s)
|
||||
if i := lastIndexByte(s, '\n'); i != -1 {
|
||||
charsLeft = 75 - (len(s) - i - 1)
|
||||
} else {
|
||||
charsLeft -= len(s)
|
||||
}
|
||||
}
|
||||
w.writeString("\r\n")
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeLine(s string, charsLeft int) string {
|
||||
// If there is already a newline before the limit. Write the line.
|
||||
if i := strings.IndexByte(s, '\n'); i != -1 && i < charsLeft {
|
||||
w.writeString(s[:i+1])
|
||||
return s[i+1:]
|
||||
}
|
||||
|
||||
for i := charsLeft - 1; i >= 0; i-- {
|
||||
if s[i] == ' ' {
|
||||
w.writeString(s[:i])
|
||||
w.writeString("\r\n ")
|
||||
return s[i+1:]
|
||||
}
|
||||
}
|
||||
|
||||
// We could not insert a newline cleanly so look for a space or a newline
|
||||
// even if it is after the limit.
|
||||
for i := 75; i < len(s); i++ {
|
||||
if s[i] == ' ' {
|
||||
w.writeString(s[:i])
|
||||
w.writeString("\r\n ")
|
||||
return s[i+1:]
|
||||
}
|
||||
if s[i] == '\n' {
|
||||
w.writeString(s[:i+1])
|
||||
return s[i+1:]
|
||||
}
|
||||
}
|
||||
|
||||
// Too bad, no space or newline in the whole string. Just write everything.
|
||||
w.writeString(s)
|
||||
return ""
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeHeaders(h map[string][]string) {
|
||||
if w.depth == 0 {
|
||||
for k, v := range h {
|
||||
if k != "Bcc" {
|
||||
w.writeHeader(k, v...)
|
||||
}
|
||||
}
|
||||
} else {
|
||||
w.createPart(h)
|
||||
}
|
||||
}
|
||||
|
||||
func (w *messageWriter) writeBody(f func(io.Writer) error, enc Encoding) {
|
||||
var subWriter io.Writer
|
||||
if w.depth == 0 {
|
||||
w.writeString("\r\n")
|
||||
subWriter = w.w
|
||||
} else {
|
||||
subWriter = w.partWriter
|
||||
}
|
||||
|
||||
if enc == Base64 {
|
||||
wc := base64.NewEncoder(base64.StdEncoding, newBase64LineWriter(subWriter))
|
||||
w.err = f(wc)
|
||||
wc.Close()
|
||||
} else if enc == Unencoded {
|
||||
w.err = f(subWriter)
|
||||
} else {
|
||||
wc := newQPWriter(subWriter)
|
||||
w.err = f(wc)
|
||||
wc.Close()
|
||||
}
|
||||
}
|
||||
|
||||
// As required by RFC 2045, 6.7. (page 21) for quoted-printable, and
|
||||
// RFC 2045, 6.8. (page 25) for base64.
|
||||
const maxLineLen = 76
|
||||
|
||||
// base64LineWriter limits text encoded in base64 to 76 characters per line
|
||||
type base64LineWriter struct {
|
||||
w io.Writer
|
||||
lineLen int
|
||||
}
|
||||
|
||||
func newBase64LineWriter(w io.Writer) *base64LineWriter {
|
||||
return &base64LineWriter{w: w}
|
||||
}
|
||||
|
||||
func (w *base64LineWriter) Write(p []byte) (int, error) {
|
||||
n := 0
|
||||
for len(p)+w.lineLen > maxLineLen {
|
||||
w.w.Write(p[:maxLineLen-w.lineLen])
|
||||
w.w.Write([]byte("\r\n"))
|
||||
p = p[maxLineLen-w.lineLen:]
|
||||
n += maxLineLen - w.lineLen
|
||||
w.lineLen = 0
|
||||
}
|
||||
|
||||
w.w.Write(p)
|
||||
w.lineLen += len(p)
|
||||
|
||||
return n + len(p), nil
|
||||
}
|
Loading…
Reference in New Issue
Block a user