1package identity
 2
 3import (
 4	"encoding/json"
 5	"errors"
 6	"fmt"
 7	"strings"
 8)
 9
10var ErrIdentityNotExist = errors.New("identity doesn't exist")
11
12type ErrMultipleMatch struct {
13	Matching []string
14}
15
16func (e ErrMultipleMatch) Error() string {
17	return fmt.Sprintf("Multiple matching identities found:\n%s", strings.Join(e.Matching, "\n"))
18}
19
20// Custom unmarshaling function to allow package user to delegate
21// the decoding of an Identity and distinguish between an Identity
22// and a Bare.
23//
24// If the given message has a "id" field, it's considered being a proper Identity.
25func UnmarshalJSON(raw json.RawMessage) (Interface, error) {
26	aux := &IdentityStub{}
27
28	// First try to decode and load as a normal Identity
29	err := json.Unmarshal(raw, &aux)
30	if err == nil && aux.Id() != "" {
31		return aux, nil
32	}
33
34	// abort if we have an error other than the wrong type
35	if _, ok := err.(*json.UnmarshalTypeError); err != nil && !ok {
36		return nil, err
37	}
38
39	// Fallback on a legacy Bare identity
40	b := &Bare{}
41
42	err = json.Unmarshal(raw, b)
43	if err == nil && (b.name != "" || b.login != "") {
44		return b, nil
45	}
46
47	// abort if we have an error other than the wrong type
48	if _, ok := err.(*json.UnmarshalTypeError); err != nil && !ok {
49		return nil, err
50	}
51
52	return nil, fmt.Errorf("unknown identity type")
53}