Add support for message deletion (nctalk) (#1492)

* nctalk: add message deletion support

Signed-off-by: Gary Kim <gary@garykim.dev>

* nctalk: seperate out deletion and sending logic

Signed-off-by: Gary Kim <gary@garykim.dev>

* nctalk: update library to v0.2.0

Signed-off-by: Gary Kim <gary@garykim.dev>

* Rename functions to be clearer

Signed-off-by: Gary Kim <gary@garykim.dev>

* Update to go-nc-talk v0.2.1

Signed-off-by: Gary Kim <gary@garykim.dev>

* Update to go-nc-talk v0.2.2

Signed-off-by: Gary Kim <gary@garykim.dev>

* Make deletions easier to debug

Signed-off-by: Gary Kim <gary@garykim.dev>

4 files changed, 152 insertions, 43 deletions

diff --git a/vendor/gomod.garykim.dev/nc-talk/ocs/capabilities.go b/vendor/gomod.garykim.dev/nc-talk/ocs/capabilities.go
index 4dbaa735..8b2919fc 100644
--- a/vendor/gomod.garykim.dev/nc-talk/ocs/capabilities.go
+++ b/vendor/gomod.garykim.dev/nc-talk/ocs/capabilities.go
@@ -33,10 +33,14 @@ type SpreedCapabilities struct {
 			Folder  string `json:"folder"`
 		} `json:"attachments"`
 		Chat struct {
-			MaxLength int `json:"max-length"`
+			MaxLength   int `json:"max-length"`
+			ReadPrivacy int `json:"read-privacy"`
 		} `json:"chat"`
 		Conversations struct {
 			CanCreate bool `json:"can-create"`
 		} `json:"conversations"`
+		Previews struct {
+			MaxGifSize int `json:"max-gif-size"`
+		} `json:"previews"`
 	} `json:"config"`
 }
diff --git a/vendor/gomod.garykim.dev/nc-talk/ocs/message.go b/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
index d4766006..1a8f95dc 100644
--- a/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
+++ b/vendor/gomod.garykim.dev/nc-talk/ocs/message.go
@@ -35,6 +35,15 @@ const (
 	// MessageCommand is a Nextcloud Talk message that is a command
 	MessageCommand MessageType = "command"
 
+	// MessageDelete is a Nextcloud Talk message indicating a message that was deleted
+	//
+	// If a message has been deleted, a message of MessageType MessageSystem is
+	// sent through the channel for which the parent message's MessageType is MessageDelete.
+	// So, in order to check if a new message is a message deletion request, a check
+	// like this can be used:
+	// msg.MessageType == ocs.MessageSystem && msg.Parent != nil && msg.Parent.MessageType == ocs.MessageDelete
+	MessageDelete MessageType = "comment_deleted"
+
 	// ActorUser is a Nextcloud Talk message sent by a user
 	ActorUser ActorType = "users"
 
@@ -55,6 +64,8 @@ type TalkRoomMessageData struct {
 	SystemMessage     string                      `json:"systemMessage"`
 	Timestamp         int                         `json:"timestamp"`
 	MessageType       MessageType                 `json:"messageType"`
+	Deleted           bool                        `json:"deleted"`
+	Parent            *TalkRoomMessageData        `json:"parent"`
 	MessageParameters map[string]RichObjectString `json:"-"`
 }
 
diff --git a/vendor/gomod.garykim.dev/nc-talk/room/room.go b/vendor/gomod.garykim.dev/nc-talk/room/room.go
index 1ee73740..eb72c2c0 100644
--- a/vendor/gomod.garykim.dev/nc-talk/room/room.go
+++ b/vendor/gomod.garykim.dev/nc-talk/room/room.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"errors"
 	"io/ioutil"
+	"net/http"
 	"strconv"
 	"time"
 
@@ -41,6 +42,12 @@ var (
 	ErrUnexpectedReturnCode = errors.New("unexpected return code")
 	// ErrTooManyRequests is returned if the server returns a 429
 	ErrTooManyRequests = errors.New("too many requests")
+	// ErrLackingCapabilities is returned if the server lacks the required capability for the given function
+	ErrLackingCapabilities = errors.New("lacking required capabilities")
+	// ErrForbidden is returned if the user is forbidden from accessing the requested resource
+	ErrForbidden = errors.New("request forbidden")
+	// ErrUnexpectedResponse is returned if the response from the Nextcloud Talk server is not formatted as expected
+	ErrUnexpectedResponse = errors.New("unexpected response")
 )
 
 // TalkRoom represents a room in Nextcloud Talk
@@ -90,6 +97,39 @@ func (t *TalkRoom) SendMessage(msg string) (*ocs.TalkRoomMessageData, error) {
 	return &msgInfo.OCS.TalkRoomMessage, err
 }
 
+// DeleteMessage deletes the message with the given messageID on the server.
+//
+// Requires "delete-messages" capability on the Nextcloud Talk server
+func (t *TalkRoom) DeleteMessage(messageID int) (*ocs.TalkRoomMessageData, error) {
+	// Check for required capability
+	capable, err := t.User.Capabilities()
+	if err != nil {
+		return nil, err
+	}
+	if !capable.DeleteMessages {
+		return nil, ErrLackingCapabilities
+	}
+
+	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token + "/" + strconv.Itoa(messageID)
+
+	client := t.User.RequestClient(request.Client{
+		URL:    url,
+		Method: "DELETE",
+	})
+	res, err := client.Do()
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode() != http.StatusOK && res.StatusCode() != http.StatusAccepted {
+		return nil, ErrUnexpectedReturnCode
+	}
+	msgInfo, err := ocs.TalkRoomSentResponseUnmarshal(&res.Data)
+	if err != nil {
+		return nil, err
+	}
+	return &msgInfo.OCS.TalkRoomMessage, nil
+}
+
 // ReceiveMessages starts watching for new messages
 func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessageData, error) {
 	c := make(chan ocs.TalkRoomMessageData)
@@ -133,23 +173,28 @@ func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessag
 			}
 
 			// If it seems that we no longer have access to the chat for one reason or another, stop the goroutine and set error in the next return.
-			if res.StatusCode == 404 {
+			if res.StatusCode == http.StatusNotFound {
 				_ = res.Body.Close()
 				c <- ocs.TalkRoomMessageData{Error: ErrRoomNotFound}
 				return
 			}
-			if res.StatusCode == 401 {
+			if res.StatusCode == http.StatusUnauthorized {
 				_ = res.Body.Close()
 				c <- ocs.TalkRoomMessageData{Error: ErrUnauthorized}
 				return
 			}
-			if res.StatusCode == 429 {
+			if res.StatusCode == http.StatusTooManyRequests {
 				_ = res.Body.Close()
 				c <- ocs.TalkRoomMessageData{Error: ErrTooManyRequests}
 				return
 			}
+			if res.StatusCode == http.StatusForbidden {
+				_ = res.Body.Close()
+				c <- ocs.TalkRoomMessageData{Error: ErrForbidden}
+				return
+			}
 
-			if res.StatusCode == 200 {
+			if res.StatusCode == http.StatusOK {
 				lastKnown = res.Header.Get("X-Chat-Last-Given")
 				data, err := ioutil.ReadAll(res.Body)
 				_ = res.Body.Close()
@@ -192,13 +237,13 @@ func (t *TalkRoom) TestConnection() error {
 		return err
 	}
 	switch res.StatusCode() {
-	case 200:
+	case http.StatusOK:
 		return nil
-	case 304:
+	case http.StatusNotModified:
 		return nil
-	case 404:
+	case http.StatusNotFound:
 		return ErrRoomNotFound
-	case 412:
+	case http.StatusPreconditionFailed:
 		return ErrNotModeratorInLobby
 	}
 	return ErrUnexpectedReturnCode
diff --git a/vendor/gomod.garykim.dev/nc-talk/user/user.go b/vendor/gomod.garykim.dev/nc-talk/user/user.go
index 2b42dacf..e557cffa 100644
--- a/vendor/gomod.garykim.dev/nc-talk/user/user.go
+++ b/vendor/gomod.garykim.dev/nc-talk/user/user.go
@@ -28,12 +28,16 @@ import (
 
 const (
 	ocsCapabilitiesEndpoint = "/ocs/v2.php/cloud/capabilities"
-	ocsRoomsEndpoint        = "/ocs/v2.php/apps/spreed/api/v2/room"
+	ocsRoomsv2Endpoint      = "/ocs/v2.php/apps/spreed/api/v2/room"
+	ocsRoomsv4Endpoint      = "/ocs/v2.php/apps/spreed/api/v4/room"
 )
 
 var (
-	// ErrUserIsNil is returned when a funciton is called with an nil user.
+	// ErrUserIsNil is returned when a function is called with an nil user.
 	ErrUserIsNil = errors.New("user is nil")
+
+	// ErrCannotDownloadFile is returned when a function cannot download the requested file
+	ErrCannotDownloadFile = errors.New("cannot download file")
 )
 
 // TalkUser represents a user of Nextcloud Talk
@@ -53,36 +57,52 @@ type TalkUserConfig struct {
 // Capabilities describes the capabilities that the Nextcloud Talk instance is capable of. Visit https://nextcloud-talk.readthedocs.io/en/latest/capabilities/ for more info.
 type Capabilities struct {
 	AttachmentsFolder      string `ocscapability:"config => attachments => folder"`
-	ChatMaxLength          int
-	Audio                  bool `ocscapability:"audio"`
-	Video                  bool `ocscapability:"video"`
-	Chat                   bool `ocscapability:"chat"`
-	GuestSignaling         bool `ocscapability:"guest-signaling"`
-	EmptyGroupRoom         bool `ocscapability:"empty-group-room"`
-	GuestDisplayNames      bool `ocscapability:"guest-display-names"`
-	MultiRoomUsers         bool `ocscapability:"multi-room-users"`
-	ChatV2                 bool `ocscapability:"chat-v2"`
-	Favorites              bool `ocscapability:"favorites"`
-	LastRoomActivity       bool `ocscapability:"last-room-activity"`
-	NoPing                 bool `ocscapability:"no-ping"`
-	SystemMessages         bool `ocscapability:"system-messages"`
-	MentionFlag            bool `ocscapability:"mention-flag"`
-	InCallFlags            bool `ocscapability:"in-call-flags"`
-	InviteByMail           bool `ocscapability:"invite-by-mail"`
-	NotificationLevels     bool `ocscapability:"notification-levels"`
-	InviteGroupsAndMails   bool `ocscapability:"invite-groups-and-mails"`
-	LockedOneToOneRooms    bool `ocscapability:"locked-one-to-one-rooms"`
-	ReadOnlyRooms          bool `ocscapability:"read-only-rooms"`
-	ChatReadMarker         bool `ocscapability:"chat-read-marker"`
-	WebinaryLobby          bool `ocscapability:"webinary-lobby"`
-	StartCallFlag          bool `ocscapability:"start-call-flag"`
-	ChatReplies            bool `ocscapability:"chat-replies"`
-	CirclesSupport         bool `ocscapability:"circles-support"`
-	AttachmentsAllowed     bool `ocscapability:"config => attachments => allowed"`
-	ConversationsCanCreate bool `ocscapability:"config => conversations => can-create"`
-	ForceMute              bool `ocscapability:"force-mute"`
-	ConversationV2         bool `ocscapability:"conversation-v2"`
-	ChatReferenceID        bool `ocscapability:"chat-reference-id"`
+	Audio                  bool   `ocscapability:"audio"`
+	Video                  bool   `ocscapability:"video"`
+	Chat                   bool   `ocscapability:"chat"`
+	GuestSignaling         bool   `ocscapability:"guest-signaling"`
+	EmptyGroupRoom         bool   `ocscapability:"empty-group-room"`
+	GuestDisplayNames      bool   `ocscapability:"guest-display-names"`
+	MultiRoomUsers         bool   `ocscapability:"multi-room-users"`
+	ChatV2                 bool   `ocscapability:"chat-v2"`
+	Favorites              bool   `ocscapability:"favorites"`
+	LastRoomActivity       bool   `ocscapability:"last-room-activity"`
+	NoPing                 bool   `ocscapability:"no-ping"`
+	SystemMessages         bool   `ocscapability:"system-messages"`
+	MentionFlag            bool   `ocscapability:"mention-flag"`
+	InCallFlags            bool   `ocscapability:"in-call-flags"`
+	InviteByMail           bool   `ocscapability:"invite-by-mail"`
+	NotificationLevels     bool   `ocscapability:"notification-levels"`
+	InviteGroupsAndMails   bool   `ocscapability:"invite-groups-and-mails"`
+	LockedOneToOneRooms    bool   `ocscapability:"locked-one-to-one-rooms"`
+	ReadOnlyRooms          bool   `ocscapability:"read-only-rooms"`
+	ChatReadMarker         bool   `ocscapability:"chat-read-marker"`
+	WebinaryLobby          bool   `ocscapability:"webinary-lobby"`
+	StartCallFlag          bool   `ocscapability:"start-call-flag"`
+	ChatReplies            bool   `ocscapability:"chat-replies"`
+	CirclesSupport         bool   `ocscapability:"circles-support"`
+	AttachmentsAllowed     bool   `ocscapability:"config => attachments => allowed"`
+	ConversationsCanCreate bool   `ocscapability:"config => conversations => can-create"`
+	ForceMute              bool   `ocscapability:"force-mute"`
+	ConversationV2         bool   `ocscapability:"conversation-v2"`
+	ChatReferenceID        bool   `ocscapability:"chat-reference-id"`
+	ConversationV3         bool   `ocscapability:"conversation-v3"`
+	ConversationV4         bool   `ocscapability:"conversation-v4"`
+	SIPSupport             bool   `ocscapability:"sip-support"`
+	ChatReadStatus         bool   `ocscapability:"chat-read-status"`
+	ListableRooms          bool   `ocscapability:"listable-rooms"`
+	PhonebookSearch        bool   `ocscapability:"phonebook-search"`
+	RaiseHand              bool   `ocscapability:"raise-hand"`
+	RoomDescription        bool   `ocscapability:"room-description"`
+	DeleteMessages         bool   `ocscapability:"delete-messages"`
+	RichObjectSharing      bool   `ocscapability:"rich-object-sharing"`
+	ConversationCallFlags  bool   `ocscapability:"conversation-call-flags"`
+	GeoLocationSharing     bool   `ocscapability:"geo-location-sharing"`
+	ReadPrivacyConfig      bool   `ocscapability:"config => chat => read-privacy"`
+	SignalingV3            bool   `ocscapability:"signaling-v3"`
+	TempUserAvatarAPI      bool   `ocscapability:"temp-user-avatar-api"`
+	MaxGifSizeConfig       int    `ocscapability:"config => previews => max-gif-size"`
+	ChatMaxLength          int    `ocscapability:"config => chat => max-length"`
 }
 
 // RoomInfo contains information about a room
@@ -160,8 +180,17 @@ func (t *TalkUser) RequestClient(client request.Client) *request.Client {
 
 // GetRooms returns a list of all rooms the user is in
 func (t *TalkUser) GetRooms() (*[]RoomInfo, error) {
+	endpoint := ocsRoomsv2Endpoint
+	capabilities, err := t.Capabilities()
+	if err != nil {
+		return nil, err
+	}
+	if capabilities.ConversationV4 {
+		endpoint = ocsRoomsv4Endpoint
+	}
+
 	client := t.RequestClient(request.Client{
-		URL: ocsRoomsEndpoint,
+		URL: endpoint,
 	})
 	res, err := client.Do()
 	if err != nil {
@@ -239,6 +268,22 @@ func (t *TalkUser) Capabilities() (*Capabilities, error) {
 		ConversationV2:         sliceContains(sc.Features, "conversation-v2"),
 		ChatReferenceID:        sliceContains(sc.Features, "chat-reference-id"),
 		ChatMaxLength:          sc.Config.Chat.MaxLength,
+		ConversationV3:         sliceContains(sc.Features, "conversation-v3"),
+		ConversationV4:         sliceContains(sc.Features, "conversation-v4"),
+		SIPSupport:             sliceContains(sc.Features, "sip-support"),
+		ChatReadStatus:         sliceContains(sc.Features, "chat-read-status"),
+		ListableRooms:          sliceContains(sc.Features, "listable-rooms"),
+		PhonebookSearch:        sliceContains(sc.Features, "phonebook-search"),
+		RaiseHand:              sliceContains(sc.Features, "raise-hand"),
+		RoomDescription:        sliceContains(sc.Features, "room-description"),
+		ReadPrivacyConfig:      sc.Config.Chat.ReadPrivacy != 0,
+		MaxGifSizeConfig:       sc.Config.Previews.MaxGifSize,
+		DeleteMessages:         sliceContains(sc.Features, "delete-messages"),
+		RichObjectSharing:      sliceContains(sc.Features, "rich-object-sharing"),
+		ConversationCallFlags:  sliceContains(sc.Features, "conversation-call-flags"),
+		GeoLocationSharing:     sliceContains(sc.Features, "geo-location-sharing"),
+		SignalingV3:            sliceContains(sc.Features, "signaling-v3"),
+		TempUserAvatarAPI:      sliceContains(sc.Features, "temp-user-avatar-api"),
 	}
 
 	t.capabilities = tr
@@ -264,7 +309,11 @@ func (t *TalkUser) DownloadFile(path string) (data *[]byte, err error) {
 		URL: url,
 	})
 	res, err := c.Do()
-	if err != nil || res.StatusCode() != 200 {
+	if err != nil {
+		return
+	}
+	if res.StatusCode() != 200 {
+		err = ErrCannotDownloadFile
 		return
 	}
 	data = &res.Data