Imports github.com/DisposaBoy/JsonConfigReader github.com/go-playground/validator/v10 github.com/goji/httpauth github.com/gorilla/handlers github.com/gorilla/mux gopkg.in/mailgun/mailgun-go.v1 Standard library imports bytes crypto/sha256 encoding/base64 encoding/csv encoding/json errors fmt io log mime net/http net/mail net/smtp os path path/filepath reflect regexp strconv strings