1 package apub
2 
3 import (
4 	"fmt"
5 	"net/mail"
6 	"strings"
7 
8 	"webfinger.net/go/webfinger"
9 )
10 
11 // Finger wraps defaultClient.Finger.
12 func Finger(address string) (*Actor, error) {
13 	return DefaultClient.Finger(address)
14 }
15 
16 // Finger is convenience method returning the corresponding Actor,
17 // if any, of an address resolvable by WebFinger.
18 // It is equivalent to doing webfinger.Lookup then LookupActor.
19 func (c *Client) Finger(address string) (*Actor, error) {
20 	jrd, err := webfinger.Lookup(address, nil)
21 	if err != nil {
22 		return nil, err
23 	}
24 	for i := range jrd.Links {
25 		if jrd.Links[i].Type == ContentType {
26 			return c.LookupActor(jrd.Links[i].Href)
27 		}
28 	}
29 	return nil, ErrNotExist
30 }
31 
32 func (c *Client) fingerAll(alist []*mail.Address) ([]Actor, error) {
33 	actors := make([]Actor, len(alist))
34 	for i, addr := range alist {
35 		q := addr.Address
36 		if strings.Contains(addr.Address, "+followers") {
37 			// strip "+followers" to get the regular address that can be fingered.
38 			q = strings.Replace(addr.Address, "+followers", "", 1)
39 		}
40 		actor, err := c.Finger(q)
41 		if err != nil {
42 			return actors, fmt.Errorf("finger %s: %w", q, err)
43 		}
44 		actors[i] = *actor
45 	}
46 	return actors, nil
47 }