Implement a few team endpoints for APIv4 (#5296)

* Implement GET /teams/{team_id} endpoint for APIv4

* Implement GET /users/{user_id}/teams endpoint for APIv4

* Implement GET /teams/{team_id}/members/{user_id} endpoint for APIv4

model/client4.go

@@ -64,6 +64,14 @@ func (c *Client4) GetTeamsRoute() string {
 	return fmt.Sprintf("/teams")
 }
 
+func (c *Client4) GetTeamRoute(teamId string) string {
+	return fmt.Sprintf(c.GetTeamsRoute()+"/%v", teamId)
+}
+
+func (c *Client4) GetTeamMemberRoute(teamId, userId string) string {
+	return fmt.Sprintf(c.GetTeamRoute(teamId)+"/members/%v", userId)
+}
+
 func (c *Client4) GetChannelsRoute() string {
 	return fmt.Sprintf("/channels")
 }
@@ -72,10 +80,6 @@ func (c *Client4) GetChannelRoute(channelId string) string {
 	return fmt.Sprintf(c.GetChannelsRoute()+"/%v", channelId)
 }
 
-func (c *Client4) GetTeamRoute(teamId string) string {
-	return fmt.Sprintf(c.GetTeamsRoute()+"/%v", teamId)
-}
-
 func (c *Client4) DoApiGet(url string, etag string) (*http.Response, *AppError) {
 	return c.DoApiRequest(http.MethodGet, url, "", etag)
 }
@@ -321,6 +325,37 @@ func (c *Client4) CreateTeam(team *Team) (*Team, *Response) {
 	}
 }
 
+// GetTeam returns a team based on the provided team id string.
+func (c *Client4) GetTeam(teamId, etag string) (*Team, *Response) {
+	if r, err := c.DoApiGet(c.GetTeamRoute(teamId), etag); err != nil {
+		return nil, &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return TeamFromJson(r.Body), BuildResponse(r)
+	}
+}
+
+// GetTeamsForUser returns a list of teams a user is on. Must be logged in as the user
+// or be a system administrator.
+func (c *Client4) GetTeamsForUser(userId, etag string) ([]*Team, *Response) {
+	if r, err := c.DoApiGet(c.GetUserRoute(userId)+"/teams", etag); err != nil {
+		return nil, &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return TeamListFromJson(r.Body), BuildResponse(r)
+	}
+}
+
+// GetTeamMember returns a team member based on the provided team and user id strings.
+func (c *Client4) GetTeamMember(teamId, userId, etag string) (*TeamMember, *Response) {
+	if r, err := c.DoApiGet(c.GetTeamMemberRoute(teamId, userId), etag); err != nil {
+		return nil, &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return TeamMemberFromJson(r.Body), BuildResponse(r)
+	}
+}
+
 // Channel Section
 
 // CreateChannel creates a channel based on the provided channel struct.

model/team.go

@@ -112,6 +112,26 @@ func TeamMapFromJson(data io.Reader) map[string]*Team {
 	}
 }
 
+func TeamListToJson(t []*Team) string {
+	b, err := json.Marshal(t)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func TeamListFromJson(data io.Reader) []*Team {
+	decoder := json.NewDecoder(data)
+	var teams []*Team
+	err := decoder.Decode(&teams)
+	if err == nil {
+		return teams
+	} else {
+		return nil
+	}
+}
+
 func (o *Team) Etag() string {
 	return Etag(o.Id, o.UpdateAt)
 }