1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76

package activitypub

import (
	"errors"
	"fmt"
	"github.com/go-ap/activitystreams"
)

type withObjectFn func (*activitystreams.Object) error
type withActivityFn func (*activitystreams.Activity) error
type withIntransitiveActivityFn func (*activitystreams.IntransitiveActivity) error
type withQuestionFn func (*activitystreams.Question) error
type withPersonFn func (*Person) error

// OnObject
func OnObject(it activitystreams.Item, fn withObjectFn) error {
	if !activitystreams.ObjectTypes.Contains(it.GetType()) {
		return errors.New(fmt.Sprintf("%T[%s] can't be converted to Object", it, it.GetType()))
	}
	ob, err  := activitystreams.ToObject(it)
	if err != nil {
		return err
	}
	return fn(ob)
}

// OnActivity
func OnActivity(it activitystreams.Item, fn withActivityFn) error {
	if !activitystreams.ActivityTypes.Contains(it.GetType()) {
		return errors.New(fmt.Sprintf("%T[%s] can't be converted to Activity", it, it.GetType()))
	}
	act, err  := activitystreams.ToActivity(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnIntransitiveActivity
func OnIntransitiveActivity(it activitystreams.Item, fn withIntransitiveActivityFn) error {
	if !activitystreams.IntransitiveActivityTypes.Contains(it.GetType()) {
		return errors.New(fmt.Sprintf("%T[%s] can't be converted to Activity", it, it.GetType()))
	}
	if it.GetType() == activitystreams.QuestionType {
		errors.New(fmt.Sprintf("For %T[%s] you need to use OnQuestion function", it, it.GetType()))
	}
	act, err  := activitystreams.ToIntransitiveActivity(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnQuestion
func OnQuestion(it activitystreams.Item, fn withQuestionFn) error {
	if it.GetType() != activitystreams.QuestionType {
		errors.New(fmt.Sprintf("For %T[%s] can't be converted to Question", it, it.GetType()))
	}
	act, err  := activitystreams.ToQuestion(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnPerson
func OnPerson(it activitystreams.Item, fn withPersonFn) error {
	if !activitystreams.ActorTypes.Contains(it.GetType()) {
		return errors.New(fmt.Sprintf("%T[%s] can't be converted to Person", it, it.GetType()))
	}
	pers, err  := ToPerson(it)
	if err != nil {
		return err
	}
	return fn(pers)
}