nasso.dev
forked from
tangled.org/core
fork
Configure Feed
Select the types of activity you want to include in your feed.
this repo has no description
fork
Configure Feed
Select the types of activity you want to include in your feed.
anirudh.fi
1package main
2
3import (
4 "flag"
5 "fmt"
6 "io"
7 "os"
8 "strings"
9
10 "tangled.sh/tangled.sh/core/crypto"
11)
12
13func parseCommitObject(commitData string) (string, string, error) {
14 lines := strings.Split(commitData, "\n")
15
16 var payloadLines []string
17 var signatureLines []string
18 var inSignature bool
19 var foundSignature bool
20
21 for _, line := range lines {
22 if strings.HasPrefix(line, "gpgsig ") {
23 foundSignature = true
24 inSignature = true
25 // remove 'gpgsig' prefix
26 sigLine := strings.TrimPrefix(line, "gpgsig ")
27 signatureLines = append(signatureLines, sigLine)
28 continue
29 }
30
31 if inSignature {
32 // check if this line is part of the signature (starts with space)
33 if strings.HasPrefix(line, " ") {
34 // remove the leading space and add to signature
35 sigLine := strings.TrimPrefix(line, " ")
36 signatureLines = append(signatureLines, sigLine)
37 continue
38 } else {
39 // end of signature block
40 inSignature = false
41 // this line is part of payload, so add it
42 payloadLines = append(payloadLines, line)
43 }
44 } else {
45 // regular payload line
46 payloadLines = append(payloadLines, line)
47 }
48 }
49
50 if !foundSignature {
51 return "", commitData, nil // no signature found, return empty signature and full data as payload
52 }
53
54 signature := strings.Join(signatureLines, "\n")
55 payload := strings.Join(payloadLines, "\n")
56
57 return signature, payload, nil
58}
59
60func main() {
61 var pubkeyPath string
62 flag.StringVar(&pubkeyPath, "pubkey", "", "Path to the public key file")
63 flag.Parse()
64
65 var pubKey []byte
66 var err error
67 if pubkeyPath != "" {
68 pubKey, err = os.ReadFile(pubkeyPath)
69 if err != nil {
70 fmt.Fprintf(os.Stderr, "error reading public key file: %v\n", err)
71 os.Exit(1)
72 }
73 }
74
75 input, err := io.ReadAll(os.Stdin)
76 if err != nil {
77 fmt.Fprintf(os.Stderr, "error reading from stdin: %v\n", err)
78 os.Exit(1)
79 }
80
81 commitData := string(input)
82
83 signature, payload, err := parseCommitObject(commitData)
84 if err != nil {
85 fmt.Fprintf(os.Stderr, "error parsing commit: %v\n", err)
86 os.Exit(1)
87 }
88
89 fmt.Println("signature")
90 fmt.Println(signature)
91 fmt.Println()
92 fmt.Println("payload:")
93 fmt.Println(payload)
94
95 err, ok := crypto.VerifySignature(pubKey, []byte(signature), []byte(payload))
96 if err != nil {
97 fmt.Fprintf(os.Stderr, "%v\n", err)
98 os.Exit(1)
99 }
100 if ok {
101 fmt.Println("ok")
102 }
103}