Update vendor

1 files changed, 719 insertions, 0 deletions

diff --git a/vendor/github.com/mattermost/mattermost-server/v6/model/post.go b/vendor/github.com/mattermost/mattermost-server/v6/model/post.go
new file mode 100644
index 00000000..d13fef0a
--- /dev/null
+++ b/vendor/github.com/mattermost/mattermost-server/v6/model/post.go
@@ -0,0 +1,719 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"regexp"
+	"sort"
+	"strings"
+	"sync"
+	"unicode/utf8"
+
+	"github.com/mattermost/mattermost-server/v6/shared/markdown"
+)
+
+const (
+	PostSystemMessagePrefix        = "system_"
+	PostTypeDefault                = ""
+	PostTypeSlackAttachment        = "slack_attachment"
+	PostTypeSystemGeneric          = "system_generic"
+	PostTypeJoinLeave              = "system_join_leave" // Deprecated, use PostJoinChannel or PostLeaveChannel instead
+	PostTypeJoinChannel            = "system_join_channel"
+	PostTypeGuestJoinChannel       = "system_guest_join_channel"
+	PostTypeLeaveChannel           = "system_leave_channel"
+	PostTypeJoinTeam               = "system_join_team"
+	PostTypeLeaveTeam              = "system_leave_team"
+	PostTypeAutoResponder          = "system_auto_responder"
+	PostTypeAddRemove              = "system_add_remove" // Deprecated, use PostAddToChannel or PostRemoveFromChannel instead
+	PostTypeAddToChannel           = "system_add_to_channel"
+	PostTypeAddGuestToChannel      = "system_add_guest_to_chan"
+	PostTypeRemoveFromChannel      = "system_remove_from_channel"
+	PostTypeMoveChannel            = "system_move_channel"
+	PostTypeAddToTeam              = "system_add_to_team"
+	PostTypeRemoveFromTeam         = "system_remove_from_team"
+	PostTypeHeaderChange           = "system_header_change"
+	PostTypeDisplaynameChange      = "system_displayname_change"
+	PostTypeConvertChannel         = "system_convert_channel"
+	PostTypePurposeChange          = "system_purpose_change"
+	PostTypeChannelDeleted         = "system_channel_deleted"
+	PostTypeChannelRestored        = "system_channel_restored"
+	PostTypeEphemeral              = "system_ephemeral"
+	PostTypeChangeChannelPrivacy   = "system_change_chan_privacy"
+	PostTypeAddBotTeamsChannels    = "add_bot_teams_channels"
+	PostTypeSystemWarnMetricStatus = "warn_metric_status"
+	PostTypeMe                     = "me"
+	PostCustomTypePrefix           = "custom_"
+
+	PostFileidsMaxRunes   = 300
+	PostFilenamesMaxRunes = 4000
+	PostHashtagsMaxRunes  = 1000
+	PostMessageMaxRunesV1 = 4000
+	PostMessageMaxBytesV2 = 65535                     // Maximum size of a TEXT column in MySQL
+	PostMessageMaxRunesV2 = PostMessageMaxBytesV2 / 4 // Assume a worst-case representation
+	PostPropsMaxRunes     = 800000
+	PostPropsMaxUserRunes = PostPropsMaxRunes - 40000 // Leave some room for system / pre-save modifications
+
+	PropsAddChannelMember = "add_channel_member"
+
+	PostPropsAddedUserId       = "addedUserId"
+	PostPropsDeleteBy          = "deleteBy"
+	PostPropsOverrideIconURL   = "override_icon_url"
+	PostPropsOverrideIconEmoji = "override_icon_emoji"
+
+	PostPropsMentionHighlightDisabled = "mentionHighlightDisabled"
+	PostPropsGroupHighlightDisabled   = "disable_group_highlight"
+
+	PostPropsPreviewedPost = "previewed_post"
+)
+
+type Post struct {
+	Id         string `json:"id"`
+	CreateAt   int64  `json:"create_at"`
+	UpdateAt   int64  `json:"update_at"`
+	EditAt     int64  `json:"edit_at"`
+	DeleteAt   int64  `json:"delete_at"`
+	IsPinned   bool   `json:"is_pinned"`
+	UserId     string `json:"user_id"`
+	ChannelId  string `json:"channel_id"`
+	RootId     string `json:"root_id"`
+	OriginalId string `json:"original_id"`
+
+	Message string `json:"message"`
+	// MessageSource will contain the message as submitted by the user if Message has been modified
+	// by Mattermost for presentation (e.g if an image proxy is being used). It should be used to
+	// populate edit boxes if present.
+	MessageSource string `json:"message_source,omitempty" db:"-"`
+
+	Type          string          `json:"type"`
+	propsMu       sync.RWMutex    `db:"-"`       // Unexported mutex used to guard Post.Props.
+	Props         StringInterface `json:"props"` // Deprecated: use GetProps()
+	Hashtags      string          `json:"hashtags"`
+	Filenames     StringArray     `json:"-"` // Deprecated, do not use this field any more
+	FileIds       StringArray     `json:"file_ids,omitempty"`
+	PendingPostId string          `json:"pending_post_id" db:"-"`
+	HasReactions  bool            `json:"has_reactions,omitempty"`
+	RemoteId      *string         `json:"remote_id,omitempty"`
+
+	// Transient data populated before sending a post to the client
+	ReplyCount   int64         `json:"reply_count" db:"-"`
+	LastReplyAt  int64         `json:"last_reply_at" db:"-"`
+	Participants []*User       `json:"participants" db:"-"`
+	IsFollowing  *bool         `json:"is_following,omitempty" db:"-"` // for root posts in collapsed thread mode indicates if the current user is following this thread
+	Metadata     *PostMetadata `json:"metadata,omitempty" db:"-"`
+}
+
+type PostEphemeral struct {
+	UserID string `json:"user_id"`
+	Post   *Post  `json:"post"`
+}
+
+type PostPatch struct {
+	IsPinned     *bool            `json:"is_pinned"`
+	Message      *string          `json:"message"`
+	Props        *StringInterface `json:"props"`
+	FileIds      *StringArray     `json:"file_ids"`
+	HasReactions *bool            `json:"has_reactions"`
+}
+
+type SearchParameter struct {
+	Terms                  *string `json:"terms"`
+	IsOrSearch             *bool   `json:"is_or_search"`
+	TimeZoneOffset         *int    `json:"time_zone_offset"`
+	Page                   *int    `json:"page"`
+	PerPage                *int    `json:"per_page"`
+	IncludeDeletedChannels *bool   `json:"include_deleted_channels"`
+}
+
+type AnalyticsPostCountsOptions struct {
+	TeamId        string
+	BotsOnly      bool
+	YesterdayOnly bool
+}
+
+func (o *PostPatch) WithRewrittenImageURLs(f func(string) string) *PostPatch {
+	copy := *o
+	if copy.Message != nil {
+		*copy.Message = RewriteImageURLs(*o.Message, f)
+	}
+	return &copy
+}
+
+type PostForExport struct {
+	Post
+	TeamName    string
+	ChannelName string
+	Username    string
+	ReplyCount  int
+}
+
+type DirectPostForExport struct {
+	Post
+	User           string
+	ChannelMembers *[]string
+}
+
+type ReplyForExport struct {
+	Post
+	Username string
+}
+
+type PostForIndexing struct {
+	Post
+	TeamId         string `json:"team_id"`
+	ParentCreateAt *int64 `json:"parent_create_at"`
+}
+
+type FileForIndexing struct {
+	FileInfo
+	ChannelId string `json:"channel_id"`
+	Content   string `json:"content"`
+}
+
+// ShallowCopy is an utility function to shallow copy a Post to the given
+// destination without touching the internal RWMutex.
+func (o *Post) ShallowCopy(dst *Post) error {
+	if dst == nil {
+		return errors.New("dst cannot be nil")
+	}
+	o.propsMu.RLock()
+	defer o.propsMu.RUnlock()
+	dst.propsMu.Lock()
+	defer dst.propsMu.Unlock()
+	dst.Id = o.Id
+	dst.CreateAt = o.CreateAt
+	dst.UpdateAt = o.UpdateAt
+	dst.EditAt = o.EditAt
+	dst.DeleteAt = o.DeleteAt
+	dst.IsPinned = o.IsPinned
+	dst.UserId = o.UserId
+	dst.ChannelId = o.ChannelId
+	dst.RootId = o.RootId
+	dst.OriginalId = o.OriginalId
+	dst.Message = o.Message
+	dst.MessageSource = o.MessageSource
+	dst.Type = o.Type
+	dst.Props = o.Props
+	dst.Hashtags = o.Hashtags
+	dst.Filenames = o.Filenames
+	dst.FileIds = o.FileIds
+	dst.PendingPostId = o.PendingPostId
+	dst.HasReactions = o.HasReactions
+	dst.ReplyCount = o.ReplyCount
+	dst.Participants = o.Participants
+	dst.LastReplyAt = o.LastReplyAt
+	dst.Metadata = o.Metadata
+	if o.IsFollowing != nil {
+		dst.IsFollowing = NewBool(*o.IsFollowing)
+	}
+	dst.RemoteId = o.RemoteId
+	return nil
+}
+
+// Clone shallowly copies the post and returns the copy.
+func (o *Post) Clone() *Post {
+	copy := &Post{}
+	o.ShallowCopy(copy)
+	return copy
+}
+
+func (o *Post) ToJSON() (string, error) {
+	copy := o.Clone()
+	copy.StripActionIntegrations()
+	b, err := json.Marshal(copy)
+	return string(b), err
+}
+
+type GetPostsSinceOptions struct {
+	UserId                   string
+	ChannelId                string
+	Time                     int64
+	SkipFetchThreads         bool
+	CollapsedThreads         bool
+	CollapsedThreadsExtended bool
+	SortAscending            bool
+}
+
+type GetPostsSinceForSyncCursor struct {
+	LastPostUpdateAt int64
+	LastPostId       string
+}
+
+type GetPostsSinceForSyncOptions struct {
+	ChannelId       string
+	ExcludeRemoteId string
+	IncludeDeleted  bool
+}
+
+type GetPostsOptions struct {
+	UserId                   string
+	ChannelId                string
+	PostId                   string
+	Page                     int
+	PerPage                  int
+	SkipFetchThreads         bool
+	CollapsedThreads         bool
+	CollapsedThreadsExtended bool
+}
+
+func (o *Post) Etag() string {
+	return Etag(o.Id, o.UpdateAt)
+}
+
+func (o *Post) IsValid(maxPostSize int) *AppError {
+	if !IsValidId(o.Id) {
+		return NewAppError("Post.IsValid", "model.post.is_valid.id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if o.CreateAt == 0 {
+		return NewAppError("Post.IsValid", "model.post.is_valid.create_at.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	if o.UpdateAt == 0 {
+		return NewAppError("Post.IsValid", "model.post.is_valid.update_at.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	if !IsValidId(o.UserId) {
+		return NewAppError("Post.IsValid", "model.post.is_valid.user_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if !IsValidId(o.ChannelId) {
+		return NewAppError("Post.IsValid", "model.post.is_valid.channel_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if !(IsValidId(o.RootId) || o.RootId == "") {
+		return NewAppError("Post.IsValid", "model.post.is_valid.root_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if !(len(o.OriginalId) == 26 || o.OriginalId == "") {
+		return NewAppError("Post.IsValid", "model.post.is_valid.original_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if utf8.RuneCountInString(o.Message) > maxPostSize {
+		return NewAppError("Post.IsValid", "model.post.is_valid.msg.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	if utf8.RuneCountInString(o.Hashtags) > PostHashtagsMaxRunes {
+		return NewAppError("Post.IsValid", "model.post.is_valid.hashtags.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	switch o.Type {
+	case
+		PostTypeDefault,
+		PostTypeSystemGeneric,
+		PostTypeJoinLeave,
+		PostTypeAutoResponder,
+		PostTypeAddRemove,
+		PostTypeJoinChannel,
+		PostTypeGuestJoinChannel,
+		PostTypeLeaveChannel,
+		PostTypeJoinTeam,
+		PostTypeLeaveTeam,
+		PostTypeAddToChannel,
+		PostTypeAddGuestToChannel,
+		PostTypeRemoveFromChannel,
+		PostTypeMoveChannel,
+		PostTypeAddToTeam,
+		PostTypeRemoveFromTeam,
+		PostTypeSlackAttachment,
+		PostTypeHeaderChange,
+		PostTypePurposeChange,
+		PostTypeDisplaynameChange,
+		PostTypeConvertChannel,
+		PostTypeChannelDeleted,
+		PostTypeChannelRestored,
+		PostTypeChangeChannelPrivacy,
+		PostTypeAddBotTeamsChannels,
+		PostTypeSystemWarnMetricStatus,
+		PostTypeMe:
+	default:
+		if !strings.HasPrefix(o.Type, PostCustomTypePrefix) {
+			return NewAppError("Post.IsValid", "model.post.is_valid.type.app_error", nil, "id="+o.Type, http.StatusBadRequest)
+		}
+	}
+
+	if utf8.RuneCountInString(ArrayToJSON(o.Filenames)) > PostFilenamesMaxRunes {
+		return NewAppError("Post.IsValid", "model.post.is_valid.filenames.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	if utf8.RuneCountInString(ArrayToJSON(o.FileIds)) > PostFileidsMaxRunes {
+		return NewAppError("Post.IsValid", "model.post.is_valid.file_ids.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	if utf8.RuneCountInString(StringInterfaceToJSON(o.GetProps())) > PostPropsMaxRunes {
+		return NewAppError("Post.IsValid", "model.post.is_valid.props.app_error", nil, "id="+o.Id, http.StatusBadRequest)
+	}
+
+	return nil
+}
+
+func (o *Post) SanitizeProps() {
+	if o == nil {
+		return
+	}
+	membersToSanitize := []string{
+		PropsAddChannelMember,
+	}
+
+	for _, member := range membersToSanitize {
+		if _, ok := o.GetProps()[member]; ok {
+			o.DelProp(member)
+		}
+	}
+	for _, p := range o.Participants {
+		p.Sanitize(map[string]bool{})
+	}
+}
+
+func (o *Post) PreSave() {
+	if o.Id == "" {
+		o.Id = NewId()
+	}
+
+	o.OriginalId = ""
+
+	if o.CreateAt == 0 {
+		o.CreateAt = GetMillis()
+	}
+
+	o.UpdateAt = o.CreateAt
+	o.PreCommit()
+}
+
+func (o *Post) PreCommit() {
+	if o.GetProps() == nil {
+		o.SetProps(make(map[string]interface{}))
+	}
+
+	if o.Filenames == nil {
+		o.Filenames = []string{}
+	}
+
+	if o.FileIds == nil {
+		o.FileIds = []string{}
+	}
+
+	o.GenerateActionIds()
+
+	// There's a rare bug where the client sends up duplicate FileIds so protect against that
+	o.FileIds = RemoveDuplicateStrings(o.FileIds)
+}
+
+func (o *Post) MakeNonNil() {
+	if o.GetProps() == nil {
+		o.SetProps(make(map[string]interface{}))
+	}
+}
+
+func (o *Post) DelProp(key string) {
+	o.propsMu.Lock()
+	defer o.propsMu.Unlock()
+	propsCopy := make(map[string]interface{}, len(o.Props)-1)
+	for k, v := range o.Props {
+		propsCopy[k] = v
+	}
+	delete(propsCopy, key)
+	o.Props = propsCopy
+}
+
+func (o *Post) AddProp(key string, value interface{}) {
+	o.propsMu.Lock()
+	defer o.propsMu.Unlock()
+	propsCopy := make(map[string]interface{}, len(o.Props)+1)
+	for k, v := range o.Props {
+		propsCopy[k] = v
+	}
+	propsCopy[key] = value
+	o.Props = propsCopy
+}
+
+func (o *Post) GetProps() StringInterface {
+	o.propsMu.RLock()
+	defer o.propsMu.RUnlock()
+	return o.Props
+}
+
+func (o *Post) SetProps(props StringInterface) {
+	o.propsMu.Lock()
+	defer o.propsMu.Unlock()
+	o.Props = props
+}
+
+func (o *Post) GetProp(key string) interface{} {
+	o.propsMu.RLock()
+	defer o.propsMu.RUnlock()
+	return o.Props[key]
+}
+
+func (o *Post) IsSystemMessage() bool {
+	return len(o.Type) >= len(PostSystemMessagePrefix) && o.Type[:len(PostSystemMessagePrefix)] == PostSystemMessagePrefix
+}
+
+// IsRemote returns true if the post originated on a remote cluster.
+func (o *Post) IsRemote() bool {
+	return o.RemoteId != nil && *o.RemoteId != ""
+}
+
+// GetRemoteID safely returns the remoteID or empty string if not remote.
+func (o *Post) GetRemoteID() string {
+	if o.RemoteId != nil {
+		return *o.RemoteId
+	}
+	return ""
+}
+
+func (o *Post) IsJoinLeaveMessage() bool {
+	return o.Type == PostTypeJoinLeave ||
+		o.Type == PostTypeAddRemove ||
+		o.Type == PostTypeJoinChannel ||
+		o.Type == PostTypeLeaveChannel ||
+		o.Type == PostTypeJoinTeam ||
+		o.Type == PostTypeLeaveTeam ||
+		o.Type == PostTypeAddToChannel ||
+		o.Type == PostTypeRemoveFromChannel ||
+		o.Type == PostTypeAddToTeam ||
+		o.Type == PostTypeRemoveFromTeam
+}
+
+func (o *Post) Patch(patch *PostPatch) {
+	if patch.IsPinned != nil {
+		o.IsPinned = *patch.IsPinned
+	}
+
+	if patch.Message != nil {
+		o.Message = *patch.Message
+	}
+
+	if patch.Props != nil {
+		newProps := *patch.Props
+		o.SetProps(newProps)
+	}
+
+	if patch.FileIds != nil {
+		o.FileIds = *patch.FileIds
+	}
+
+	if patch.HasReactions != nil {
+		o.HasReactions = *patch.HasReactions
+	}
+}
+
+func (o *Post) ChannelMentions() []string {
+	return ChannelMentions(o.Message)
+}
+
+// DisableMentionHighlights disables a posts mention highlighting and returns the first channel mention that was present in the message.
+func (o *Post) DisableMentionHighlights() string {
+	mention, hasMentions := findAtChannelMention(o.Message)
+	if hasMentions {
+		o.AddProp(PostPropsMentionHighlightDisabled, true)
+	}
+	return mention
+}
+
+// DisableMentionHighlights disables mention highlighting for a post patch if required.
+func (o *PostPatch) DisableMentionHighlights() {
+	if o.Message == nil {
+		return
+	}
+	if _, hasMentions := findAtChannelMention(*o.Message); hasMentions {
+		if o.Props == nil {
+			o.Props = &StringInterface{}
+		}
+		(*o.Props)[PostPropsMentionHighlightDisabled] = true
+	}
+}
+
+func findAtChannelMention(message string) (mention string, found bool) {
+	re := regexp.MustCompile(`(?i)\B@(channel|all|here)\b`)
+	matched := re.FindStringSubmatch(message)
+	if found = (len(matched) > 0); found {
+		mention = strings.ToLower(matched[0])
+	}
+	return
+}
+
+func (o *Post) Attachments() []*SlackAttachment {
+	if attachments, ok := o.GetProp("attachments").([]*SlackAttachment); ok {
+		return attachments
+	}
+	var ret []*SlackAttachment
+	if attachments, ok := o.GetProp("attachments").([]interface{}); ok {
+		for _, attachment := range attachments {
+			if enc, err := json.Marshal(attachment); err == nil {
+				var decoded SlackAttachment
+				if json.Unmarshal(enc, &decoded) == nil {
+					// Ignoring nil actions
+					i := 0
+					for _, action := range decoded.Actions {
+						if action != nil {
+							decoded.Actions[i] = action
+							i++
+						}
+					}
+					decoded.Actions = decoded.Actions[:i]
+
+					// Ignoring nil fields
+					i = 0
+					for _, field := range decoded.Fields {
+						if field != nil {
+							decoded.Fields[i] = field
+							i++
+						}
+					}
+					decoded.Fields = decoded.Fields[:i]
+					ret = append(ret, &decoded)
+				}
+			}
+		}
+	}
+	return ret
+}
+
+func (o *Post) AttachmentsEqual(input *Post) bool {
+	attachments := o.Attachments()
+	inputAttachments := input.Attachments()
+
+	if len(attachments) != len(inputAttachments) {
+		return false
+	}
+
+	for i := range attachments {
+		if !attachments[i].Equals(inputAttachments[i]) {
+			return false
+		}
+	}
+
+	return true
+}
+
+var markdownDestinationEscaper = strings.NewReplacer(
+	`\`, `\\`,
+	`<`, `\<`,
+	`>`, `\>`,
+	`(`, `\(`,
+	`)`, `\)`,
+)
+
+// WithRewrittenImageURLs returns a new shallow copy of the post where the message has been
+// rewritten via RewriteImageURLs.
+func (o *Post) WithRewrittenImageURLs(f func(string) string) *Post {
+	copy := o.Clone()
+	copy.Message = RewriteImageURLs(o.Message, f)
+	if copy.MessageSource == "" && copy.Message != o.Message {
+		copy.MessageSource = o.Message
+	}
+	return copy
+}
+
+// RewriteImageURLs takes a message and returns a copy that has all of the image URLs replaced
+// according to the function f. For each image URL, f will be invoked, and the resulting markdown
+// will contain the URL returned by that invocation instead.
+//
+// Image URLs are destination URLs used in inline images or reference definitions that are used
+// anywhere in the input markdown as an image.
+func RewriteImageURLs(message string, f func(string) string) string {
+	if !strings.Contains(message, "![") {
+		return message
+	}
+
+	var ranges []markdown.Range
+
+	markdown.Inspect(message, func(blockOrInline interface{}) bool {
+		switch v := blockOrInline.(type) {
+		case *markdown.ReferenceImage:
+			ranges = append(ranges, v.ReferenceDefinition.RawDestination)
+		case *markdown.InlineImage:
+			ranges = append(ranges, v.RawDestination)
+		default:
+			return true
+		}
+		return true
+	})
+
+	if ranges == nil {
+		return message
+	}
+
+	sort.Slice(ranges, func(i, j int) bool {
+		return ranges[i].Position < ranges[j].Position
+	})
+
+	copyRanges := make([]markdown.Range, 0, len(ranges))
+	urls := make([]string, 0, len(ranges))
+	resultLength := len(message)
+
+	start := 0
+	for i, r := range ranges {
+		switch {
+		case i == 0:
+		case r.Position != ranges[i-1].Position:
+			start = ranges[i-1].End
+		default:
+			continue
+		}
+		original := message[r.Position:r.End]
+		replacement := markdownDestinationEscaper.Replace(f(markdown.Unescape(original)))
+		resultLength += len(replacement) - len(original)
+		copyRanges = append(copyRanges, markdown.Range{Position: start, End: r.Position})
+		urls = append(urls, replacement)
+	}
+
+	result := make([]byte, resultLength)
+
+	offset := 0
+	for i, r := range copyRanges {
+		offset += copy(result[offset:], message[r.Position:r.End])
+		offset += copy(result[offset:], urls[i])
+	}
+	copy(result[offset:], message[ranges[len(ranges)-1].End:])
+
+	return string(result)
+}
+
+func (o *Post) IsFromOAuthBot() bool {
+	props := o.GetProps()
+	return props["from_webhook"] == "true" && props["override_username"] != ""
+}
+
+func (o *Post) ToNilIfInvalid() *Post {
+	if o.Id == "" {
+		return nil
+	}
+	return o
+}
+
+func (o *Post) RemovePreviewPost() {
+	if o.Metadata == nil || o.Metadata.Embeds == nil {
+		return
+	}
+	n := 0
+	for _, embed := range o.Metadata.Embeds {
+		if embed.Type != PostEmbedPermalink {
+			o.Metadata.Embeds[n] = embed
+			n++
+		}
+	}
+	o.Metadata.Embeds = o.Metadata.Embeds[:n]
+}
+
+func (o *Post) GetPreviewPost() *PreviewPost {
+	for _, embed := range o.Metadata.Embeds {
+		if embed.Type == PostEmbedPermalink {
+			if previewPost, ok := embed.Data.(*PreviewPost); ok {
+				return previewPost
+			}
+		}
+	}
+	return nil
+}
+
+func (o *Post) GetPreviewedPostProp() string {
+	if val, ok := o.GetProp(PostPropsPreviewedPost).(string); ok {
+		return val
+	}
+	return ""
+}