PLT-6403: Interactive messages (#7274)

* wip

* finish first pass

* requested changes

* add DoPostAction to Client4

4 files changed, 108 insertions, 2 deletions

diff --git a/model/client4.go b/model/client4.go
index 0f7578539..26ea6ee03 100644
--- a/model/client4.go
+++ b/model/client4.go
@@ -1803,6 +1803,16 @@ func (c *Client4) SearchPosts(teamId string, terms string, isOrSearch bool) (*Po
 	}
 }
 
+// DoPostAction performs a post action.
+func (c *Client4) DoPostAction(postId, actionId string) (bool, *Response) {
+	if r, err := c.DoApiPost(c.GetPostRoute(postId)+"/actions/"+actionId, ""); err != nil {
+		return false, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return CheckStatusOK(r), BuildResponse(r)
+	}
+}
+
 // File Section
 
 // UploadFile will upload a file to a channel, to be later attached to a post.
diff --git a/model/post.go b/model/post.go
index 55e6f591d..1c2e9b937 100644
--- a/model/post.go
+++ b/model/post.go
@@ -68,8 +68,31 @@ type PostForIndexing struct {
 	ParentCreateAt *int64 `json:"parent_create_at"`
 }
 
+type PostAction struct {
+	Id          string                 `json:"id"`
+	Name        string                 `json:"name"`
+	Integration *PostActionIntegration `json:"integration,omitempty"`
+}
+
+type PostActionIntegration struct {
+	URL     string          `json:"url,omitempty"`
+	Context StringInterface `json:"context,omitempty"`
+}
+
+type PostActionIntegrationRequest struct {
+	UserId  string          `json:"user_id"`
+	Context StringInterface `json:"context,omitempty"`
+}
+
+type PostActionIntegrationResponse struct {
+	Update        *Post  `json:"update"`
+	EphemeralText string `json:"ephemeral_text"`
+}
+
 func (o *Post) ToJson() string {
-	b, err := json.Marshal(o)
+	copy := *o
+	copy.StripActionIntegrations()
+	b, err := json.Marshal(&copy)
 	if err != nil {
 		return ""
 	} else {
@@ -179,6 +202,16 @@ func (o *Post) PreSave() {
 		o.Props = make(map[string]interface{})
 	}
 
+	if attachments, ok := o.Props["attachments"].([]*SlackAttachment); ok {
+		for _, attachment := range attachments {
+			for _, action := range attachment.Actions {
+				if action.Id == "" {
+					action.Id = NewId()
+				}
+			}
+		}
+	}
+
 	if o.Filenames == nil {
 		o.Filenames = []string{}
 	}
@@ -246,3 +279,53 @@ func PostPatchFromJson(data io.Reader) *PostPatch {
 
 	return &post
 }
+
+func (r *PostActionIntegrationRequest) ToJson() string {
+	b, err := json.Marshal(r)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func (o *Post) Attachments() []*SlackAttachment {
+	if attachments, ok := o.Props["attachments"].([]*SlackAttachment); ok {
+		return attachments
+	}
+	var ret []*SlackAttachment
+	if attachments, ok := o.Props["attachments"].([]interface{}); ok {
+		for _, attachment := range attachments {
+			if enc, err := json.Marshal(attachment); err == nil {
+				var decoded SlackAttachment
+				if json.Unmarshal(enc, &decoded) == nil {
+					ret = append(ret, &decoded)
+				}
+			}
+		}
+	}
+	return ret
+}
+
+func (o *Post) StripActionIntegrations() {
+	attachments := o.Attachments()
+	if o.Props["attachments"] != nil {
+		o.Props["attachments"] = attachments
+	}
+	for _, attachment := range attachments {
+		for _, action := range attachment.Actions {
+			action.Integration = nil
+		}
+	}
+}
+
+func (o *Post) GetAction(id string) *PostAction {
+	for _, attachment := range o.Attachments() {
+		for _, action := range attachment.Actions {
+			if action.Id == id {
+				return action
+			}
+		}
+	}
+	return nil
+}
diff --git a/model/post_list.go b/model/post_list.go
index 63f6d6825..b3caadafd 100644
--- a/model/post_list.go
+++ b/model/post_list.go
@@ -20,8 +20,20 @@ func NewPostList() *PostList {
 	}
 }
 
+func (o *PostList) StripActionIntegrations() {
+	posts := o.Posts
+	o.Posts = make(map[string]*Post)
+	for id, post := range posts {
+		pcopy := *post
+		pcopy.StripActionIntegrations()
+		o.Posts[id] = &pcopy
+	}
+}
+
 func (o *PostList) ToJson() string {
-	b, err := json.Marshal(o)
+	copy := *o
+	copy.StripActionIntegrations()
+	b, err := json.Marshal(&copy)
 	if err != nil {
 		return ""
 	} else {
diff --git a/model/slack_attachment.go b/model/slack_attachment.go
index 855838214..fe3958316 100644
--- a/model/slack_attachment.go
+++ b/model/slack_attachment.go
@@ -25,6 +25,7 @@ type SlackAttachment struct {
 	Footer     string                  `json:"footer"`
 	FooterIcon string                  `json:"footer_icon"`
 	Timestamp  interface{}             `json:"ts"` // This is either a string or an int64
+	Actions    []*PostAction           `json:"actions,omitempty"`
 }
 
 type SlackAttachmentField struct {