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utils.go
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/
utils.go
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package utils
import (
"bufio"
"bytes"
"crypto/md5"
"fmt"
"io"
"net/url"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
"github.com/iawia002/lia/array"
"github.com/pkg/errors"
"github.com/wanyuqin/lux/request"
)
// MatchOneOf match one of the patterns
func MatchOneOf(text string, patterns ...string) []string {
var (
re *regexp.Regexp
value []string
)
for _, pattern := range patterns {
// (?flags): set flags within current group; non-capturing
// s: let . match \n (default false)
// https://github.com/google/re2/wiki/Syntax
re = regexp.MustCompile(pattern)
value = re.FindStringSubmatch(text)
if len(value) > 0 {
return value
}
}
return nil
}
// MatchAll return all matching results
func MatchAll(text, pattern string) [][]string {
re := regexp.MustCompile(pattern)
value := re.FindAllStringSubmatch(text, -1)
return value
}
// FileSize return the file size of the specified path file
func FileSize(filePath string) (int64, bool, error) {
file, err := os.Stat(filePath)
if err != nil {
if os.IsNotExist(err) {
return 0, false, nil
}
return 0, false, err
}
return file.Size(), true, nil
}
// Domain get the domain of given URL
func Domain(url string) string {
domainPattern := `([a-z0-9][-a-z0-9]{0,62})\.` +
`(com\.cn|com\.hk|` +
`cn|com|net|edu|gov|biz|org|info|pro|name|xxx|xyz|be|` +
`me|top|cc|tv|tt)`
domain := MatchOneOf(url, domainPattern)
if domain != nil {
return domain[1]
}
return ""
}
// LimitLength Handle overly long strings
func LimitLength(s string, length int) string {
// 0 means unlimited
if length == 0 {
return s
}
const ELLIPSES = "..."
str := []rune(s)
if len(str) > length {
return string(str[:length-len(ELLIPSES)]) + ELLIPSES
}
return s
}
// FileName Converts a string to a valid filename
func FileName(name, ext string, length int) string {
rep := strings.NewReplacer("\n", " ", "/", " ", "|", "-", ": ", ":", ":", ":", "'", "’")
name = rep.Replace(name)
if runtime.GOOS == "windows" {
rep = strings.NewReplacer("\"", " ", "?", " ", "*", " ", "\\", " ", "<", " ", ">", " ")
name = rep.Replace(name)
}
limitedName := LimitLength(name, length)
if ext == "" {
return limitedName
}
return fmt.Sprintf("%s.%s", limitedName, ext)
}
// FilePath gen valid file path
func FilePath(name, ext string, length int, outputPath string, escape bool) (string, error) {
if outputPath != "" {
if _, err := os.Stat(outputPath); err != nil {
return "", err
}
}
var fileName string
if escape {
fileName = FileName(name, ext, length)
} else {
fileName = fmt.Sprintf("%s.%s", name, ext)
}
return filepath.Join(outputPath, fileName), nil
}
// FileLineCounter Counts line in file
func FileLineCounter(r io.Reader) (int, error) {
buf := make([]byte, 32*1024)
count := 0
lineSep := []byte{'\n'}
for {
c, err := r.Read(buf)
count += bytes.Count(buf[:c], lineSep)
switch {
case err == io.EOF:
return count, nil
case err != nil:
return count, err
}
}
}
// ParseInputFile Parses input file into args
func ParseInputFile(r io.Reader, items string, itemStart, itemEnd int) []string {
scanner := bufio.NewScanner(r)
temp := make([]string, 0)
totalLines := 0
for scanner.Scan() {
totalLines++
universalURL := strings.TrimSpace(scanner.Text())
temp = append(temp, universalURL)
}
wantedItems := NeedDownloadList(items, itemStart, itemEnd, totalLines)
itemList := make([]string, 0, len(wantedItems))
for i, item := range temp {
if array.ItemInArray(i+1, wantedItems) {
itemList = append(itemList, item)
}
}
return itemList
}
// GetNameAndExt return the name and ext of the URL
// https://img9.bcyimg.com/drawer/15294/post/1799t/1f5a87801a0711e898b12b640777720f.jpg ->
// 1f5a87801a0711e898b12b640777720f, jpg
func GetNameAndExt(uri string) (string, string, error) {
u, err := url.ParseRequestURI(uri)
if err != nil {
return "", "", err
}
s := strings.Split(u.Path, "/")
filename := strings.Split(s[len(s)-1], ".")
if len(filename) > 1 {
return filename[0], filename[1], nil
}
// Image url like this
// https://img9.bcyimg.com/drawer/15294/post/1799t/1f5a87801a0711e898b12b640777720f.jpg/w650
// has no suffix
contentType, err := request.ContentType(uri, uri)
if err != nil {
return "", "", err
}
return filename[0], strings.Split(contentType, "/")[1], nil
}
// Md5 md5 hash
func Md5(text string) string {
sign := md5.New()
sign.Write([]byte(text)) // nolint
return fmt.Sprintf("%x", sign.Sum(nil))
}
// M3u8URLs get all urls from m3u8 url
func M3u8URLs(uri string) ([]string, error) {
if len(uri) == 0 {
return nil, errors.New("url is null")
}
html, err := request.Get(uri, "", nil)
if err != nil {
return nil, errors.WithStack(err)
}
lines := strings.Split(html, "\n")
var urls []string
for _, line := range lines {
line = strings.TrimSpace(line)
if line != "" && !strings.HasPrefix(line, "#") {
if strings.HasPrefix(line, "http") {
urls = append(urls, line)
} else {
base, err := url.Parse(uri)
if err != nil {
continue
}
u, err := url.Parse(line)
if err != nil {
continue
}
urls = append(urls, base.ResolveReference(u).String())
}
}
}
return urls, nil
}
// Reverse Reverse a string
func Reverse(s string) string {
runes := []rune(s)
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
runes[i], runes[j] = runes[j], runes[i]
}
return string(runes)
}
// Range generate a sequence of numbers by range
func Range(min, max int) []int {
items := make([]int, max-min+1)
for index := range items {
items[index] = min + index
}
return items
}