468 lines
11 KiB
Go
468 lines
11 KiB
Go
/*
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*
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* Utility Functions And Stuff
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* Copyright Azareal 2017 - 2018
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*
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*/
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package common
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import (
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"crypto/rand"
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"encoding/base32"
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"encoding/base64"
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"errors"
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"fmt"
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"html"
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"math"
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"os"
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"strconv"
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"strings"
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"time"
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"unicode"
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)
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// Version stores a Gosora version
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type Version struct {
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Major int
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Minor int
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Patch int
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Tag string
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TagID int
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}
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// TODO: Write a test for this
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func (version *Version) String() (out string) {
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out = strconv.Itoa(version.Major) + "." + strconv.Itoa(version.Minor) + "." + strconv.Itoa(version.Patch)
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if version.Tag != "" {
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out += "-" + version.Tag
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if version.TagID != 0 {
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out += strconv.Itoa(version.TagID)
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}
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}
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return
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}
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// GenerateSafeString is for generating a cryptographically secure set of random bytes which is base64 encoded and safe for URLs
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// TODO: Write a test for this
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func GenerateSafeString(length int) (string, error) {
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rb := make([]byte, length)
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_, err := rand.Read(rb)
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if err != nil {
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return "", err
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}
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return base64.URLEncoding.EncodeToString(rb), nil
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}
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// GenerateStd32SafeString is for generating a cryptographically secure set of random bytes which is base32 encoded
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// ? - Safe for URLs? Mostly likely due to the small range of characters
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func GenerateStd32SafeString(length int) (string, error) {
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rb := make([]byte, length)
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_, err := rand.Read(rb)
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if err != nil {
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return "", err
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}
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return base32.StdEncoding.EncodeToString(rb), nil
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}
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// TODO: Write a test for this
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func RelativeTimeFromString(in string) (string, error) {
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if in == "" {
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return "", nil
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}
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t, err := time.Parse("2006-01-02 15:04:05", in)
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if err != nil {
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return "", err
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}
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return RelativeTime(t), nil
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}
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// TODO: Write a test for this
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func RelativeTime(t time.Time) string {
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diff := time.Since(t)
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hours := diff.Hours()
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seconds := diff.Seconds()
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weeks := int(hours / 24 / 7)
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months := int(hours / 24 / 31)
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switch {
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case months > 3:
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if t.Year() != time.Now().Year() {
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//return t.Format("Mon Jan 2 2006")
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return t.Format("Jan 2 2006")
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}
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return t.Format("Jan 2")
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case months > 1:
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return fmt.Sprintf("%d months ago", months)
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case months == 1:
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return "a month ago"
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case weeks > 1:
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return fmt.Sprintf("%d weeks ago", weeks)
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case int(hours/24) == 7:
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return "a week ago"
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case int(hours/24) == 1:
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return "1 day ago"
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case int(hours/24) > 1:
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return fmt.Sprintf("%d days ago", int(hours/24))
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case seconds <= 1:
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return "a moment ago"
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case seconds < 60:
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return fmt.Sprintf("%d seconds ago", int(seconds))
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case seconds < 120:
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return "a minute ago"
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case seconds < 3600:
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return fmt.Sprintf("%d minutes ago", int(seconds/60))
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case seconds < 7200:
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return "an hour ago"
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}
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return fmt.Sprintf("%d hours ago", int(seconds/60/60))
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}
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// TODO: Write a test for this
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func ConvertByteUnit(bytes float64) (float64, string) {
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switch {
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case bytes >= float64(Petabyte):
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return bytes / float64(Petabyte), "PB"
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case bytes >= float64(Terabyte):
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return bytes / float64(Terabyte), "TB"
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case bytes >= float64(Gigabyte):
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return bytes / float64(Gigabyte), "GB"
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case bytes >= float64(Megabyte):
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return bytes / float64(Megabyte), "MB"
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case bytes >= float64(Kilobyte):
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return bytes / float64(Kilobyte), "KB"
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}
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return bytes, " bytes"
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}
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// TODO: Write a test for this
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func ConvertByteInUnit(bytes float64, unit string) (count float64) {
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switch unit {
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case "PB":
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count = bytes / float64(Petabyte)
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case "TB":
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count = bytes / float64(Terabyte)
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case "GB":
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count = bytes / float64(Gigabyte)
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case "MB":
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count = bytes / float64(Megabyte)
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case "KB":
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count = bytes / float64(Kilobyte)
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default:
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count = 0.1
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}
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if count < 0.1 {
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count = 0.1
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}
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return
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}
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// TODO: Write a test for this
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func FriendlyUnitToBytes(quantity int, unit string) (bytes int, err error) {
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switch unit {
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case "PB":
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bytes = quantity * Petabyte
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case "TB":
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bytes = quantity * Terabyte
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case "GB":
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bytes = quantity * Gigabyte
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case "MB":
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bytes = quantity * Megabyte
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case "KB":
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bytes = quantity * Kilobyte
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case "":
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// Do nothing
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default:
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return bytes, errors.New("Unknown unit")
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}
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return bytes, nil
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}
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// TODO: Write a test for this
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// TODO: Re-add T as int64
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func ConvertUnit(num int) (int, string) {
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switch {
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case num >= 1000000000000:
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return num / 1000000000000, "T"
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case num >= 1000000000:
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return num / 1000000000, "B"
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case num >= 1000000:
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return num / 1000000, "M"
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case num >= 1000:
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return num / 1000, "K"
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}
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return num, ""
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}
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// TODO: Write a test for this
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// TODO: Re-add quadrillion as int64
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// TODO: Re-add trillion as int64
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func ConvertFriendlyUnit(num int) (int, string) {
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switch {
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case num >= 1000000000000000:
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return 0, " quadrillion"
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case num >= 1000000000000:
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return 0, " trillion"
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case num >= 1000000000:
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return num / 1000000000, " billion"
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case num >= 1000000:
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return num / 1000000, " million"
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case num >= 1000:
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return num / 1000, " thousand"
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}
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return num, ""
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}
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// TODO: Make slugs optional for certain languages across the entirety of Gosora?
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// TODO: Let plugins replace NameToSlug and the URL building logic with their own
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func NameToSlug(name string) (slug string) {
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// TODO: Do we want this reliant on config file flags? This might complicate tests and oddball uses
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if !Config.BuildSlugs {
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return ""
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}
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name = strings.TrimSpace(name)
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name = strings.Replace(name, " ", " ", -1)
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for _, char := range name {
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if unicode.IsLower(char) || unicode.IsNumber(char) {
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slug += string(char)
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} else if unicode.IsUpper(char) {
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slug += string(unicode.ToLower(char))
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} else if unicode.IsSpace(char) {
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slug += "-"
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}
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}
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if slug == "" {
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slug = "untitled"
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}
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return slug
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}
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// TODO: Write a test for this
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func HasSuspiciousEmail(email string) bool {
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lowEmail := strings.ToLower(email)
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// TODO: Use a more flexible blacklist, perhaps with a similar mechanism to the HTML tag registration system in PreparseMessage()
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if strings.Contains(lowEmail, "casino") || strings.Contains(lowEmail, "viagra") || strings.Contains(lowEmail, "pharma") || strings.Contains(lowEmail, "pill") {
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return true
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}
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var dotCount int
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var shortBits int
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var currentSegmentLength int
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for _, char := range lowEmail {
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if char == '.' {
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dotCount++
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if currentSegmentLength < 3 {
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shortBits++
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}
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currentSegmentLength = 0
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} else {
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currentSegmentLength++
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}
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}
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return dotCount > 7 || shortBits > 2
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}
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// TODO: Write a test for this
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func WeakPassword(password string, username string, email string) error {
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lowPassword := strings.ToLower(password)
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switch {
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case password == "":
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return errors.New("You didn't put in a password.")
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case strings.Contains(lowPassword, strings.ToLower(username)) && len(username) > 3:
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return errors.New("You can't use your username in your password.")
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case strings.Contains(lowPassword, strings.ToLower(email)):
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return errors.New("You can't use your email in your password.")
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case len(password) < 8:
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return errors.New("Your password needs to be at-least eight characters long")
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}
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if strings.Contains(lowPassword, "test") || /*strings.Contains(password,"123456") || */ strings.Contains(password, "123") || strings.Contains(lowPassword, "password") || strings.Contains(lowPassword, "qwerty") || strings.Contains(lowPassword, "fuck") || strings.Contains(lowPassword, "love") {
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return errors.New("You may not have 'test', '123', 'password', 'qwerty', 'love' or 'fuck' in your password")
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}
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var charMap = make(map[rune]int)
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var numbers, symbols, upper, lower int
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for _, char := range password {
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charItem, ok := charMap[char]
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if ok {
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charItem++
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} else {
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charItem = 1
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}
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charMap[char] = charItem
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if unicode.IsLetter(char) {
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if unicode.IsUpper(char) {
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upper++
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} else {
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lower++
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}
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} else if unicode.IsNumber(char) {
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numbers++
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} else {
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symbols++
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}
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}
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if numbers == 0 {
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return errors.New("You don't have any numbers in your password")
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}
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if upper == 0 {
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return errors.New("You don't have any uppercase characters in your password")
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}
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if lower == 0 {
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return errors.New("You don't have any lowercase characters in your password")
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}
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if len(password) < 18 {
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if (len(password) / 2) > len(charMap) {
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return errors.New("You don't have enough unique characters in your password")
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}
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} else if (len(password) / 3) > len(charMap) {
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// Be a little lenient on the number of unique characters for long passwords
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return errors.New("You don't have enough unique characters in your password")
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}
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return nil
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}
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// TODO: Write a test for this
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func createFile(name string) error {
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f, err := os.Create(name)
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if err != nil {
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return err
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}
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return f.Close()
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}
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// TODO: Write a test for this
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func writeFile(name string, content string) (err error) {
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f, err := os.Create(name)
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if err != nil {
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return err
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}
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_, err = f.WriteString(content)
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if err != nil {
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return err
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}
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err = f.Sync()
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if err != nil {
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return err
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}
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return f.Close()
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}
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// TODO: Write a test for this
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func Stripslashes(text string) string {
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text = strings.Replace(text, "/", "", -1)
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return strings.Replace(text, "\\", "", -1)
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}
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// The word counter might run into problems with some languages where words aren't as obviously demarcated, I would advise turning it off in those cases, or if it becomes annoying in general, really.
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func WordCount(input string) (count int) {
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input = strings.TrimSpace(input)
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if input == "" {
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return 0
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}
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var inSpace bool
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for _, value := range input {
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if unicode.IsSpace(value) || unicode.IsPunct(value) {
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if !inSpace {
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inSpace = true
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}
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} else if inSpace {
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count++
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inSpace = false
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}
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}
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return count + 1
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}
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// TODO: Write a test for this
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func GetLevel(score int) (level int) {
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var base float64 = 25
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var current, prev float64
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var expFactor = 2.8
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for i := 1; ; i++ {
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_, bit := math.Modf(float64(i) / 10)
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if bit == 0 {
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expFactor += 0.1
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}
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current = base + math.Pow(float64(i), expFactor) + (prev / 3)
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prev = current
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if float64(score) < current {
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break
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}
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level++
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}
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return level
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}
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// TODO: Write a test for this
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func GetLevelScore(getLevel int) (score int) {
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var base float64 = 25
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var current float64
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var expFactor = 2.8
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for i := 1; i <= getLevel; i++ {
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_, bit := math.Modf(float64(i) / 10)
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if bit == 0 {
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expFactor += 0.1
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}
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current = base + math.Pow(float64(i), expFactor) + (current / 3)
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//fmt.Println("level: ", i)
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//fmt.Println("current: ", current)
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}
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return int(math.Ceil(current))
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}
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// TODO: Write a test for this
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func GetLevels(maxLevel int) []float64 {
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var base float64 = 25
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var current, prev float64 // = 0
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var expFactor = 2.8
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var out []float64
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out = append(out, 0)
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for i := 1; i <= maxLevel; i++ {
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_, bit := math.Modf(float64(i) / 10)
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if bit == 0 {
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expFactor += 0.1
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}
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current = base + math.Pow(float64(i), expFactor) + (prev / 3)
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prev = current
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out = append(out, current)
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}
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return out
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}
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// TODO: Write a test for this
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// SanitiseSingleLine is a generic function for escaping html entities and removing silly characters from usernames and topic titles. It also strips newline characters
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func SanitiseSingleLine(in string) string {
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in = strings.Replace(in, "\n", "", -1)
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in = strings.Replace(in, "\r", "", -1)
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return SanitiseBody(in)
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}
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// TODO: Write a test for this
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// TODO: Add more strange characters
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// TODO: Strip all sub-32s minus \r and \n?
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// SanitiseBody is the same as SanitiseSingleLine, but it doesn't strip newline characters
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func SanitiseBody(in string) string {
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in = strings.Replace(in, "", "", -1) // Strip Zero length space
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in = html.EscapeString(in)
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return strings.TrimSpace(in)
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}
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func BuildSlug(slug string, id int) string {
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if slug == "" || !Config.BuildSlugs {
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return strconv.Itoa(id)
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}
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return slug + "." + strconv.Itoa(id)
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}
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