Changelog: 0.1.3

common/utils.go

@@ -2,11 +2,16 @@ package common
 
 import (
 	"bufio"
+	"encoding/base32"
+	"encoding/hex"
 	"fmt"
+	"github.com/anacrolix/torrent/metainfo"
 	"log"
 	"math/rand"
+	"net/http"
 	"net/url"
 	"os"
+	"regexp"
 	"strings"
 )
 
@@ -46,14 +51,51 @@ func OpenMagnetFile(filePath string) string {
 	return ""
 }
 
+func OpenMagnetHttpURL(magnetLink string) (*Magnet, error) {
+	resp, err := http.Get(magnetLink)
+	if err != nil {
+		return nil, fmt.Errorf("error making GET request: %v", err)
+	}
+	defer func(resp *http.Response) {
+		err := resp.Body.Close()
+		if err != nil {
+			return
+		}
+	}(resp) // Ensure the response is closed after the function ends
+
+	// Create a scanner to read the file line by line
+
+	mi, err := metainfo.Load(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	hash := mi.HashInfoBytes()
+	infoHash := hash.HexString()
+	info, err := mi.UnmarshalInfo()
+	if err != nil {
+		return nil, err
+	}
+	log.Println("InfoHash: ", infoHash)
+	magnet := &Magnet{
+		InfoHash: infoHash,
+		Name:     info.Name,
+		Size:     info.Length,
+		Link:     mi.Magnet(&hash, &info).String(),
+	}
+	return magnet, nil
+
+}
+
 func GetMagnetInfo(magnetLink string) (*Magnet, error) {
 	if magnetLink == "" {
 		return nil, fmt.Errorf("error getting magnet from file")
 	}
+
 	magnetURI, err := url.Parse(magnetLink)
 	if err != nil {
 		return nil, fmt.Errorf("error parsing magnet link")
 	}
+
 	query := magnetURI.Query()
 	xt := query.Get("xt")
 	dn := query.Get("dn")
@@ -81,3 +123,47 @@ func RandomString(length int) string {
 	}
 	return string(b)
 }
+
+func ExtractInfoHash(magnetDesc string) string {
+	const prefix = "xt=urn:btih:"
+	start := strings.Index(magnetDesc, prefix)
+	if start == -1 {
+		return ""
+	}
+	hash := ""
+	start += len(prefix)
+	end := strings.IndexAny(magnetDesc[start:], "&#")
+	if end == -1 {
+		hash = magnetDesc[start:]
+	} else {
+		hash = magnetDesc[start : start+end]
+	}
+	hash, _ = processInfoHash(hash) // Convert to hex if needed
+	return hash
+}
+
+func processInfoHash(input string) (string, error) {
+	// Regular expression for a valid 40-character hex infohash
+	hexRegex := regexp.MustCompile("^[0-9a-fA-F]{40}$")
+
+	// If it's already a valid hex infohash, return it as is
+	if hexRegex.MatchString(input) {
+		return strings.ToLower(input), nil
+	}
+
+	// If it's 32 characters long, it might be Base32 encoded
+	if len(input) == 32 {
+		// Ensure the input is uppercase and remove any padding
+		input = strings.ToUpper(strings.TrimRight(input, "="))
+
+		// Try to decode from Base32
+		decoded, err := base32.StdEncoding.DecodeString(input)
+		if err == nil && len(decoded) == 20 {
+			// If successful and the result is 20 bytes, encode to hex
+			return hex.EncodeToString(decoded), nil
+		}
+	}
+
+	// If we get here, it's not a valid infohash and we couldn't convert it
+	return "", fmt.Errorf("invalid infohash: %s", input)
+}