add team exists endpoint for APIv4 (#5517)

model/client4.go

@@ -600,6 +600,16 @@ func (c *Client4) GetTeamByName(name, etag string) (*Team, *Response) {
 	}
 }
 
+// TeamExists returns true or false if the team exist or not.
+func (c *Client4) TeamExists(name, etag string) (bool, *Response) {
+	if r, err := c.DoApiGet(c.GetTeamByNameRoute(name)+"/exists", etag); err != nil {
+		return false, &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return MapBoolFromJson(r.Body)["exists"], 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) {

model/utils.go

@@ -156,6 +156,15 @@ func MapToJson(objmap map[string]string) string {
 	}
 }
 
+// MapToJson converts a map to a json string
+func MapBoolToJson(objmap map[string]bool) string {
+	if b, err := json.Marshal(objmap); err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
 // MapFromJson will decode the key/value pair map
 func MapFromJson(data io.Reader) map[string]string {
 	decoder := json.NewDecoder(data)
@@ -168,6 +177,18 @@ func MapFromJson(data io.Reader) map[string]string {
 	}
 }
 
+// MapFromJson will decode the key/value pair map
+func MapBoolFromJson(data io.Reader) map[string]bool {
+	decoder := json.NewDecoder(data)
+
+	var objmap map[string]bool
+	if err := decoder.Decode(&objmap); err != nil {
+		return make(map[string]bool)
+	} else {
+		return objmap
+	}
+}
+
 func ArrayToJson(objmap []string) string {
 	if b, err := json.Marshal(objmap); err != nil {
 		return ""