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apub: handle collection recipients mroe reliably When we receive activity that has a collection, we see if any of the other actor recipients have the collection set as their followers. Then we can encode it with plus addressing. If we can't do that we drop it. Not ideal, but it covers most use cases. Next up we can encode arbitrary collections like "some/path/to/thing@example.com".
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 1 77918b00 2024-03-07 o package apub

 2 77918b00 2024-03-07 o 

 3 77918b00 2024-03-07 o import (

 4 77918b00 2024-03-07 o 	"fmt"

 5 77918b00 2024-03-07 o 	"net/mail"

 6 77918b00 2024-03-07 o 	"strings"

 7 77918b00 2024-03-07 o 

 8 77918b00 2024-03-07 o 	"webfinger.net/go/webfinger"

 9 77918b00 2024-03-07 o )

10 77918b00 2024-03-07 o 

11 eec64935 2024-03-16 o // Finger wraps defaultClient.Finger.

12 eec64935 2024-03-16 o func Finger(address string) (*Actor, error) {

13 d3dfb672 2024-03-18 o 	return DefaultClient.Finger(address)

14 eec64935 2024-03-16 o }

15 eec64935 2024-03-16 o 

16 eec64935 2024-03-16 o // Finger is convenience method returning the corresponding Actor,

17 b6986e8e 2024-03-12 o // if any, of an address resolvable by WebFinger.

18 b6986e8e 2024-03-12 o // It is equivalent to doing webfinger.Lookup then LookupActor.

19 eec64935 2024-03-16 o func (c *Client) Finger(address string) (*Actor, error) {

20 77918b00 2024-03-07 o 	jrd, err := webfinger.Lookup(address, nil)

21 77918b00 2024-03-07 o 	if err != nil {

22 77918b00 2024-03-07 o 		return nil, err

23 77918b00 2024-03-07 o 	}

24 77918b00 2024-03-07 o 	for i := range jrd.Links {

25 77918b00 2024-03-07 o 		if jrd.Links[i].Type == ContentType {

26 eec64935 2024-03-16 o 			return c.LookupActor(jrd.Links[i].Href)

27 77918b00 2024-03-07 o 		}

28 77918b00 2024-03-07 o 	}

29 77918b00 2024-03-07 o 	return nil, ErrNotExist

30 77918b00 2024-03-07 o }

31 77918b00 2024-03-07 o 

32 d3dfb672 2024-03-18 o func (c *Client) fingerAll(alist []*mail.Address) ([]Actor, error) {

33 2469f664 2024-03-12 o 	actors := make([]Actor, len(alist))

34 77918b00 2024-03-07 o 	for i, addr := range alist {

35 eec64935 2024-03-16 o 		q := addr.Address

36 77918b00 2024-03-07 o 		if strings.Contains(addr.Address, "+followers") {

37 eec64935 2024-03-16 o 			// strip "+followers" to get the regular address that can be fingered.

38 eec64935 2024-03-16 o 			q = strings.Replace(addr.Address, "+followers", "", 1)

39 77918b00 2024-03-07 o 		}

40 d3dfb672 2024-03-18 o 		actor, err := c.Finger(q)

41 77918b00 2024-03-07 o 		if err != nil {

42 eec64935 2024-03-16 o 			return actors, fmt.Errorf("finger %s: %w", q, err)

43 77918b00 2024-03-07 o 		}

44 2469f664 2024-03-12 o 		actors[i] = *actor

45 77918b00 2024-03-07 o 	}

46 77918b00 2024-03-07 o 	return actors, nil

47 77918b00 2024-03-07 o }