1 package apub
2 
3 import (
4 	"fmt"
5 	"net/mail"
6 	"os"
7 	"os/user"
8 	"path"
9 	"strings"
10 
11 	"webfinger.net/go/webfinger"
12 )
13 
14 func Finger(address string) (*Actor, error) {
15 	jrd, err := webfinger.Lookup(address, nil)
16 	if err != nil {
17 		return nil, err
18 	}
19 	for i := range jrd.Links {
20 		if jrd.Links[i].Type == ContentType {
21 			return LookupActor(jrd.Links[i].Href)
22 		}
23 	}
24 	return nil, ErrNotExist
25 }
26 
27 func fingerAll(alist []*mail.Address) ([]string, error) {
28 	actors := make([]string, len(alist))
29 	for i, addr := range alist {
30 		if strings.Contains(addr.Address, "+followers") {
31 			addr.Address = strings.Replace(addr.Address, "+followers", "", 1)
32 			a, err := Finger(addr.Address)
33 			if err != nil {
34 				return actors, fmt.Errorf("finger %s: %w", addr.Address, err)
35 			}
36 			actors[i] = a.Followers
37 			continue
38 		}
39 		actor, err := Finger(addr.Address)
40 		if err != nil {
41 			return actors, fmt.Errorf("finger %s: %w", addr.Address, err)
42 		}
43 		actors[i] = actor.ID
44 	}
45 	return actors, nil
46 }
47 
48 func UserWebFingerFile(username string) (string, error) {
49 	u, err := user.Lookup(username)
50 	if err != nil {
51 		return "", err
52 	}
53 	if u.HomeDir == "" {
54 		return "", fmt.Errorf("no home directory")
55 	}
56 
57 	paths := []string{
58 		path.Join(u.HomeDir, "lib/webfinger"),                 // Plan 9
59 		path.Join(u.HomeDir, ".config/webfinger"),             // Unix-like
60 		path.Join(u.HomeDir, "Application Support/webfinger"), // macOS
61 	}
62 	for i := range paths {
63 		if _, err := os.Stat(paths[i]); err == nil {
64 			return paths[i], nil
65 		}
66 	}
67 	return "", fmt.Errorf("no webfinger file")
68 }