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utils.go
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/
utils.go
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package main
import (
"encoding/base32"
"encoding/binary"
"encoding/hex"
"math/rand"
"net"
"os"
"strings"
"time"
"github.com/jcelliott/lumber"
"github.com/microcosm-cc/bluemonday"
"github.com/russross/blackfriday"
"github.com/shurcooL/github_flavored_markdown"
"golang.org/x/crypto/bcrypt"
)
var animals []string
var adjectives []string
var aboutPageText string
var allowInsecureHtml bool
var log *lumber.ConsoleLogger
func init() {
rand.Seed(time.Now().Unix())
animalsText, _ := Asset("static/text/animals")
animals = strings.Split(string(animalsText), ",")
adjectivesText, _ := Asset("static/text/adjectives")
adjectives = strings.Split(string(adjectivesText), "\n")
log = lumber.NewConsoleLogger(lumber.TRACE)
}
func turnOffDebugger() {
log = lumber.NewConsoleLogger(lumber.WARN)
}
func randomAnimal() string {
return strings.Replace(strings.Title(animals[rand.Intn(len(animals)-1)]), " ", "", -1)
}
func randomAdjective() string {
return strings.Replace(strings.Title(adjectives[rand.Intn(len(adjectives)-1)]), " ", "", -1)
}
func randomAlliterateCombo() (combo string) {
combo = ""
// generate random alliteration thats not been used
for {
animal := randomAnimal()
adjective := randomAdjective()
if animal[0] == adjective[0] && len(animal)+len(adjective) < 18 { //&& stringInSlice(strings.ToLower(adjective+animal), takenNames) == false {
combo = adjective + animal
break
}
}
return
}
// is there a string in a slice?
func stringInSlice(s string, strings []string) bool {
for _, k := range strings {
if s == k {
return true
}
}
return false
}
// itob returns an 8-byte big endian representation of v.
func itob(v int) []byte {
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, uint64(v))
return b
}
func contentType(filename string) string {
switch {
case strings.Contains(filename, ".css"):
return "text/css"
case strings.Contains(filename, ".jpg"):
return "image/jpeg"
case strings.Contains(filename, ".png"):
return "image/png"
case strings.Contains(filename, ".js"):
return "application/javascript"
case strings.Contains(filename, ".xml"):
return "application/xml"
}
return "text/html"
}
func timeTrack(start time.Time, name string) {
elapsed := time.Since(start)
log.Debug("%s took %s", name, elapsed)
}
var src = rand.NewSource(time.Now().UnixNano())
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
// RandStringBytesMaskImprSrc prints a random string
func RandStringBytesMaskImprSrc(n int) string {
b := make([]byte, n)
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return string(b)
}
// GetLocalIP returns the local ip address
func GetLocalIP() string {
addrs, err := net.InterfaceAddrs()
if err != nil {
return ""
}
bestIP := ""
for _, address := range addrs {
// check the address type and if it is not a loopback the display it
if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP.String()
}
}
}
return bestIP
}
// HashPassword generates a bcrypt hash of the password using work factor 14.
// https://github.com/gtank/cryptopasta/blob/master/hash.go
func HashPassword(password string) string {
hash, _ := bcrypt.GenerateFromPassword([]byte(password), 14)
return hex.EncodeToString(hash)
}
// CheckPassword securely compares a bcrypt hashed password with its possible
// plaintext equivalent. Returns nil on success, or an error on failure.
// https://github.com/gtank/cryptopasta/blob/master/hash.go
func CheckPasswordHash(password, hashedString string) error {
hash, err := hex.DecodeString(hashedString)
if err != nil {
return err
}
return bcrypt.CompareHashAndPassword(hash, []byte(password))
}
// exists returns whether the given file or directory exists or not
func exists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
return true
}
func MarkdownToHtml(s string) string {
unsafe := blackfriday.MarkdownCommon([]byte(s))
if allowInsecureHtml {
return string(unsafe)
}
pClean := bluemonday.UGCPolicy()
pClean.AllowElements("img")
pClean.AllowElements("center")
pClean.AllowAttrs("alt").OnElements("img")
pClean.AllowAttrs("src").OnElements("img")
pClean.AllowAttrs("class").OnElements("a")
pClean.AllowAttrs("href").OnElements("a")
pClean.AllowAttrs("id").OnElements("a")
pClean.AllowDataURIImages()
html := pClean.SanitizeBytes(unsafe)
return string(html)
}
func GithubMarkdownToHTML(s string) string {
return string(github_flavored_markdown.Markdown([]byte(s)))
}
func encodeToBase32(s string) string {
return encodeBytesToBase32([]byte(s))
}
func encodeBytesToBase32(s []byte) string {
return base32.StdEncoding.EncodeToString(s)
}
func decodeFromBase32(s string) (s2 string, err error) {
bString, err := base32.StdEncoding.DecodeString(s)
s2 = string(bString)
return
}
func reverseSliceInt64(s []int64) []int64 {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
return s
}
func reverseSliceString(s []string) []string {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
return s
}
func reverseSliceInt(s []int) []int {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
return s
}