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utils.go
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utils.go
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package model
import (
"bytes"
"crypto/rand"
"encoding/base32"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/mail"
"net/url"
"regexp"
"strconv"
"strings"
"time"
"unicode"
goi18n "github.com/nicksnyder/go-i18n/i18n"
"github.com/pborman/uuid"
)
const (
LOWERCASE_LETTERS = "abcdefghijklmnopqrstuvwxyz"
UPPERCASE_LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
NUMBERS = "0123456789"
SYMBOLS = " !\"\\#$%&'()*+,-./:;<=>?@[]^_`|~"
)
type StringInterface map[string]interface{}
type StringMap map[string]string
type StringArray []string
var translateFunc goi18n.TranslateFunc = nil
func AppErrorInit(t goi18n.TranslateFunc) {
translateFunc = t
}
type AppError struct {
Id string `json:"id"`
Message string `json:"message"` // Message to be display to the end user without debugging information
DetailedError string `json:"detailed_error"` // Internal error string to help the developer
RequestId string `json:"request_id,omitempty"` // The RequestId that's also set in the header
StatusCode int `json:"status_code,omitempty"` // The http status code
Where string `json:"-"` // The function where it happened in the form of Struct.Func
IsOAuth bool `json:"is_oauth,omitempty"` // Whether the error is OAuth specific
params map[string]interface{}
}
func (er *AppError) Error() string {
return er.Where + ": " + er.Message + ", " + er.DetailedError
}
func (er *AppError) Translate(T goi18n.TranslateFunc) {
if T == nil {
er.Message = er.Id
return
}
if er.params == nil {
er.Message = T(er.Id)
} else {
er.Message = T(er.Id, er.params)
}
}
func (er *AppError) SystemMessage(T goi18n.TranslateFunc) string {
if er.params == nil {
return T(er.Id)
} else {
return T(er.Id, er.params)
}
}
func (er *AppError) ToJson() string {
b, _ := json.Marshal(er)
return string(b)
}
// AppErrorFromJson will decode the input and return an AppError
func AppErrorFromJson(data io.Reader) *AppError {
str := ""
bytes, rerr := ioutil.ReadAll(data)
if rerr != nil {
str = rerr.Error()
} else {
str = string(bytes)
}
decoder := json.NewDecoder(strings.NewReader(str))
var er AppError
err := decoder.Decode(&er)
if err == nil {
return &er
} else {
return NewAppError("AppErrorFromJson", "model.utils.decode_json.app_error", nil, "body: "+str, http.StatusInternalServerError)
}
}
func NewAppError(where string, id string, params map[string]interface{}, details string, status int) *AppError {
ap := &AppError{}
ap.Id = id
ap.params = params
ap.Message = id
ap.Where = where
ap.DetailedError = details
ap.StatusCode = status
ap.IsOAuth = false
ap.Translate(translateFunc)
return ap
}
var encoding = base32.NewEncoding("ybndrfg8ejkmcpqxot1uwisza345h769")
// NewId is a globally unique identifier. It is a [A-Z0-9] string 26
// characters long. It is a UUID version 4 Guid that is zbased32 encoded
// with the padding stripped off.
func NewId() string {
var b bytes.Buffer
encoder := base32.NewEncoder(encoding, &b)
encoder.Write(uuid.NewRandom())
encoder.Close()
b.Truncate(26) // removes the '==' padding
return b.String()
}
func NewRandomString(length int) string {
var b bytes.Buffer
str := make([]byte, length+8)
rand.Read(str)
encoder := base32.NewEncoder(encoding, &b)
encoder.Write(str)
encoder.Close()
b.Truncate(length) // removes the '==' padding
return b.String()
}
// GetMillis is a convience method to get milliseconds since epoch.
func GetMillis() int64 {
return time.Now().UnixNano() / int64(time.Millisecond)
}
// GetMillisForTime is a convience method to get milliseconds since epoch for provided Time.
func GetMillisForTime(thisTime time.Time) int64 {
return thisTime.UnixNano() / int64(time.Millisecond)
}
// ParseDateFilterToTime is a convience method to get Time from string
func ParseDateFilterToTime(filterString string) time.Time {
resultTime, err := time.Parse("2006-01-02", PadDateStringZeros(filterString))
if err != nil {
return time.Now()
}
return resultTime
}
// PadDateStringZeros is a convience method to pad 2 digit date parts with zeros to meet ISO 8601 format
func PadDateStringZeros(dateString string) string {
parts := strings.Split(dateString, "-")
for index, part := range parts {
if len(part) == 1 {
parts[index] = "0" + part
}
}
dateString = strings.Join(parts[:], "-")
return dateString
}
// GetStartOfDayMillis is a convience method to get milliseconds since epoch for provided date's start of day
func GetStartOfDayMillis(thisTime time.Time, timeZoneOffset int) int64 {
localSearchTimeZone := time.FixedZone("Local Search Time Zone", timeZoneOffset)
resultTime := time.Date(thisTime.Year(), thisTime.Month(), thisTime.Day(), 0, 0, 0, 0, localSearchTimeZone)
return GetMillisForTime(resultTime)
}
// GetEndOfDayMillis is a convience method to get milliseconds since epoch for provided date's end of day
func GetEndOfDayMillis(thisTime time.Time, timeZoneOffset int) int64 {
localSearchTimeZone := time.FixedZone("Local Search Time Zone", timeZoneOffset)
resultTime := time.Date(thisTime.Year(), thisTime.Month(), thisTime.Day(), 23, 59, 59, 999999999, localSearchTimeZone)
return GetMillisForTime(resultTime)
}
func CopyStringMap(originalMap map[string]string) map[string]string {
copyMap := make(map[string]string)
for k, v := range originalMap {
copyMap[k] = v
}
return copyMap
}
// MapToJson converts a map to a json string
func MapToJson(objmap map[string]string) string {
b, _ := json.Marshal(objmap)
return string(b)
}
// MapToJson converts a map to a json string
func MapBoolToJson(objmap map[string]bool) string {
b, _ := json.Marshal(objmap)
return string(b)
}
// MapFromJson will decode the key/value pair map
func MapFromJson(data io.Reader) map[string]string {
decoder := json.NewDecoder(data)
var objmap map[string]string
if err := decoder.Decode(&objmap); err != nil {
return make(map[string]string)
} else {
return objmap
}
}
// 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 {
b, _ := json.Marshal(objmap)
return string(b)
}
func ArrayFromJson(data io.Reader) []string {
decoder := json.NewDecoder(data)
var objmap []string
if err := decoder.Decode(&objmap); err != nil {
return make([]string, 0)
} else {
return objmap
}
}
func ArrayFromInterface(data interface{}) []string {
stringArray := []string{}
dataArray, ok := data.([]interface{})
if !ok {
return stringArray
}
for _, v := range dataArray {
if str, ok := v.(string); ok {
stringArray = append(stringArray, str)
}
}
return stringArray
}
func StringInterfaceToJson(objmap map[string]interface{}) string {
b, _ := json.Marshal(objmap)
return string(b)
}
func StringInterfaceFromJson(data io.Reader) map[string]interface{} {
decoder := json.NewDecoder(data)
var objmap map[string]interface{}
if err := decoder.Decode(&objmap); err != nil {
return make(map[string]interface{})
} else {
return objmap
}
}
func StringToJson(s string) string {
b, _ := json.Marshal(s)
return string(b)
}
func StringFromJson(data io.Reader) string {
decoder := json.NewDecoder(data)
var s string
if err := decoder.Decode(&s); err != nil {
return ""
} else {
return s
}
}
func GetServerIpAddress() string {
if addrs, err := net.InterfaceAddrs(); err != nil {
return ""
} else {
for _, addr := range addrs {
if ip, ok := addr.(*net.IPNet); ok && !ip.IP.IsLoopback() && !ip.IP.IsLinkLocalUnicast() && !ip.IP.IsLinkLocalMulticast() {
if ip.IP.To4() != nil {
return ip.IP.String()
}
}
}
}
return ""
}
func IsLower(s string) bool {
return strings.ToLower(s) == s
}
func IsValidEmail(email string) bool {
if !IsLower(email) {
return false
}
if addr, err := mail.ParseAddress(email); err != nil {
return false
} else if addr.Name != "" {
// mail.ParseAddress accepts input of the form "Billy Bob <billy@example.com>" which we don't allow
return false
}
return true
}
var reservedName = []string{
"signup",
"login",
"admin",
"channel",
"post",
"api",
"oauth",
}
func IsValidChannelIdentifier(s string) bool {
if !IsValidAlphaNumHyphenUnderscore(s, true) {
return false
}
if len(s) < CHANNEL_NAME_MIN_LENGTH {
return false
}
return true
}
func IsValidAlphaNum(s string) bool {
validAlphaNum := regexp.MustCompile(`^[a-z0-9]+([a-z\-0-9]+|(__)?)[a-z0-9]+$`)
return validAlphaNum.MatchString(s)
}
func IsValidAlphaNumHyphenUnderscore(s string, withFormat bool) bool {
if withFormat {
validAlphaNumHyphenUnderscore := regexp.MustCompile(`^[a-z0-9]+([a-z\-\_0-9]+|(__)?)[a-z0-9]+$`)
return validAlphaNumHyphenUnderscore.MatchString(s)
}
validSimpleAlphaNumHyphenUnderscore := regexp.MustCompile(`^[a-zA-Z0-9\-_]+$`)
return validSimpleAlphaNumHyphenUnderscore.MatchString(s)
}
func Etag(parts ...interface{}) string {
etag := CurrentVersion
for _, part := range parts {
etag += fmt.Sprintf(".%v", part)
}
return etag
}
var validHashtag = regexp.MustCompile(`^(#\pL[\pL\d\-_.]*[\pL\d])$`)
var puncStart = regexp.MustCompile(`^[^\pL\d\s#]+`)
var hashtagStart = regexp.MustCompile(`^#{2,}`)
var puncEnd = regexp.MustCompile(`[^\pL\d\s]+$`)
func ParseHashtags(text string) (string, string) {
words := strings.Fields(text)
hashtagString := ""
plainString := ""
for _, word := range words {
// trim off surrounding punctuation
word = puncStart.ReplaceAllString(word, "")
word = puncEnd.ReplaceAllString(word, "")
// and remove extra pound #s
word = hashtagStart.ReplaceAllString(word, "#")
if validHashtag.MatchString(word) {
hashtagString += " " + word
} else {
plainString += " " + word
}
}
if len(hashtagString) > 1000 {
hashtagString = hashtagString[:999]
lastSpace := strings.LastIndex(hashtagString, " ")
if lastSpace > -1 {
hashtagString = hashtagString[:lastSpace]
} else {
hashtagString = ""
}
}
return strings.TrimSpace(hashtagString), strings.TrimSpace(plainString)
}
func IsFileExtImage(ext string) bool {
ext = strings.ToLower(ext)
for _, imgExt := range IMAGE_EXTENSIONS {
if ext == imgExt {
return true
}
}
return false
}
func GetImageMimeType(ext string) string {
ext = strings.ToLower(ext)
if len(IMAGE_MIME_TYPES[ext]) == 0 {
return "image"
} else {
return IMAGE_MIME_TYPES[ext]
}
}
func ClearMentionTags(post string) string {
post = strings.Replace(post, "<mention>", "", -1)
post = strings.Replace(post, "</mention>", "", -1)
return post
}
func IsValidHttpUrl(rawUrl string) bool {
if strings.Index(rawUrl, "http://") != 0 && strings.Index(rawUrl, "https://") != 0 {
return false
}
if _, err := url.ParseRequestURI(rawUrl); err != nil {
return false
}
return true
}
func IsValidTurnOrStunServer(rawUri string) bool {
if strings.Index(rawUri, "turn:") != 0 && strings.Index(rawUri, "stun:") != 0 {
return false
}
if _, err := url.ParseRequestURI(rawUri); err != nil {
return false
}
return true
}
func IsSafeLink(link *string) bool {
if link != nil {
if IsValidHttpUrl(*link) {
return true
} else if strings.HasPrefix(*link, "/") {
return true
} else {
return false
}
}
return true
}
func IsValidWebsocketUrl(rawUrl string) bool {
if strings.Index(rawUrl, "ws://") != 0 && strings.Index(rawUrl, "wss://") != 0 {
return false
}
if _, err := url.ParseRequestURI(rawUrl); err != nil {
return false
}
return true
}
func IsValidTrueOrFalseString(value string) bool {
return value == "true" || value == "false"
}
func IsValidNumberString(value string) bool {
if _, err := strconv.Atoi(value); err != nil {
return false
}
return true
}
func IsValidId(value string) bool {
if len(value) != 26 {
return false
}
for _, r := range value {
if !unicode.IsLetter(r) && !unicode.IsNumber(r) {
return false
}
}
return true
}
// Copied from https://golang.org/src/net/dnsclient.go#L119
func IsDomainName(s string) bool {
// See RFC 1035, RFC 3696.
// Presentation format has dots before every label except the first, and the
// terminal empty label is optional here because we assume fully-qualified
// (absolute) input. We must therefore reserve space for the first and last
// labels' length octets in wire format, where they are necessary and the
// maximum total length is 255.
// So our _effective_ maximum is 253, but 254 is not rejected if the last
// character is a dot.
l := len(s)
if l == 0 || l > 254 || l == 254 && s[l-1] != '.' {
return false
}
last := byte('.')
ok := false // Ok once we've seen a letter.
partlen := 0
for i := 0; i < len(s); i++ {
c := s[i]
switch {
default:
return false
case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
ok = true
partlen++
case '0' <= c && c <= '9':
// fine
partlen++
case c == '-':
// Byte before dash cannot be dot.
if last == '.' {
return false
}
partlen++
case c == '.':
// Byte before dot cannot be dot, dash.
if last == '.' || last == '-' {
return false
}
if partlen > 63 || partlen == 0 {
return false
}
partlen = 0
}
last = c
}
if last == '-' || partlen > 63 {
return false
}
return ok
}