initial commit

LICENSE

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+The MIT License (MIT)
+
+Copyright © 2021 Unbewohne | Nikolay Kasyanov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# magnet-info
+## Parse a magnet link into a struct
+
+# Installation 
+```
+go get github.com/Unbewohnte/magnet-info
+```
+
+# Usage
+```
+package main
+
+import (
+	"fmt"
+	magnetinfo "magnet-info"
+)
+
+func main() {
+	info, _ := magnetinfo.Parse("magnet:?xt=urn:btih:83918ea4bb488cefd3d8b8b8762597d32aebb4fa&tr=http%3A%2F%2Facademictorrents.com%2Fannounce.php&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969")
+
+	fmt.Printf("%+v", info)
+
+    // ...
+}
+```

go.mod

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+module github.com/Unbewohnte/magnetInfo
+
+go 1.17

magnetInfo.go

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+package magnetinfo
+
+import (
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+// Contains all magnet link parameters
+type MagnetInfo struct {
+	DisplayNames      []string // DN
+	ExactLength       uint64   // XL
+	ExactTopics       []string // XT
+	WebSeeds          []string // WS
+	AcceptableSources []string // AS
+	ExactSources      []string // XS
+	KeywordTopics     []string // KT
+	ManifestTopics    []string // MT
+	AddressTrackers   []string // TR
+}
+
+// Parses a magnet link and returns its info
+func Parse(magnetLink string) (*MagnetInfo, error) {
+	// split a magnet link identifier and key-value pairs
+	parts := strings.Split(magnetLink, ":?")
+
+	if len(parts) == 1 || parts[0] != "magnet" {
+		return nil, fmt.Errorf("given string does not contain a \"magnet\" identifier")
+	}
+
+	// get all key-value pairs
+	pairs := strings.Split(parts[1], "&")
+
+	var info MagnetInfo
+	for _, pair := range pairs {
+		// get key and its value
+		keyval := strings.Split(pair, "=")
+
+		key := keyval[0]
+		value := keyval[1]
+
+		switch strings.ToLower(key) {
+		case "dn":
+			value, err := url.QueryUnescape(value)
+			if err != nil {
+				return nil, err
+			}
+			info.DisplayNames = append(info.DisplayNames, value)
+
+		case "xl":
+			length, err := strconv.ParseUint(value, 10, 64)
+			if err != nil {
+				fmt.Println(err)
+			}
+			info.ExactLength = length
+
+		case "xt":
+			info.ExactTopics = append(info.ExactTopics, value)
+
+		case "ws":
+			info.WebSeeds = append(info.WebSeeds, value)
+
+		case "as":
+			value, err := url.QueryUnescape(value)
+			if err != nil {
+				return nil, err
+			}
+			info.AcceptableSources = append(info.AcceptableSources, value)
+
+		case "xs":
+			info.ExactSources = append(info.ExactSources, value)
+
+		case "kt":
+			value, err := url.QueryUnescape(value)
+			if err != nil {
+				return nil, err
+			}
+			info.KeywordTopics = append(info.KeywordTopics, value)
+
+		case "mt":
+			value, err := url.QueryUnescape(value)
+			if err != nil {
+				return nil, err
+			}
+			info.ManifestTopics = append(info.ManifestTopics, value)
+
+		case "tr":
+			value, err := url.QueryUnescape(value)
+			if err != nil {
+				return nil, err
+			}
+			info.AddressTrackers = append(info.AddressTrackers, value)
+		}
+	}
+
+	return &info, nil
+}

magnetInfo_test.go

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+package magnetinfo
+
+import (
+	"testing"
+)
+
+func Test_Parse(t *testing.T) {
+	magnets := []string{
+		"magnet:?xt=urn:btih:OVFYDTCS55I7T5JLQFZA2NH6LKZI5XDM",
+
+		"magnet:?xt=urn:btih:83918ea4bb488cefd3d8b8b8762597d32aebb4fa&tr=http%3A%2F%2Facademictorrents.com%2Fannounce.php&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969",
+
+		"magnet:?xt=urn:btih:e8b1f9c5bf555fe58bc73addb83457dd6da69630&tr=http%3A%2F%2Facademictorrents.com%2Fannounce.php&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969",
+	}
+
+	for _, magnet := range magnets {
+		_, err := Parse(magnet)
+		if err != nil {
+			t.Errorf("Parse failed: %s", err)
+		}
+	}
+}