forked from hyperledger-archives/burrow
-
Notifications
You must be signed in to change notification settings - Fork 0
/
rules.go
206 lines (176 loc) · 4.88 KB
/
rules.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
package rule
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"reflect"
validation "github.com/go-ozzo/ozzo-validation"
"github.com/hyperledger/burrow/acm"
"github.com/hyperledger/burrow/crypto"
"github.com/hyperledger/burrow/permission"
)
var PlaceholderRegex = regexp.MustCompile(`\$(?P<bracket>{?)(?P<job>[[:word:]]+)(\.(?P<variable>[[:word:]]+))?}?`)
func MatchPlaceholders(str string) []PlaceholderMatch {
matches := PlaceholderRegex.FindAllStringSubmatch(str, -1)
pms := make([]PlaceholderMatch, 0, len(matches))
for _, match := range matches {
pm := NewPlaceholderMatch(match)
if pm.IsMatch() {
pms = append(pms, pm)
}
}
return pms
}
type PlaceholderMatch struct {
Match string
JobName string
VariableName string
}
func (pm PlaceholderMatch) String() string {
var varStr string
if pm.VariableName != "" {
varStr = fmt.Sprintf(", Variable: %s", pm.VariableName)
}
return fmt.Sprintf("PlaceholderMatch{'%s': Job: %s%s}", pm.Match, pm.JobName, varStr)
}
func (pm PlaceholderMatch) IsMatch() bool {
return pm.Match != ""
}
func NewPlaceholderMatch(match []string) (pm PlaceholderMatch) {
pm.Match = match[0]
for i, name := range PlaceholderRegex.SubexpNames() {
switch name {
case "bracket":
if match[i] == "{" {
stripMatch := PlaceholderRegex.FindStringSubmatch(stripBraces(pm.Match))
if len(stripMatch) == 0 {
return PlaceholderMatch{}
}
// Match stripped but keep the outer match with brackets for use as replacement string
pmStripped := NewPlaceholderMatch(stripMatch)
pm.JobName = pmStripped.JobName
pm.VariableName = pmStripped.VariableName
}
case "job":
pm.JobName = match[i]
case "variable":
pm.VariableName = match[i]
}
}
return
}
// Strips braces and return simple variable confined between braces
func stripBraces(str string) string {
bs := []byte(str)
const lb = byte('{')
const rb = byte('}')
start := 0
for i := 0; i < len(bs); i++ {
switch bs[i] {
case lb:
start = i + 1
case rb:
return `\$` + str[start:i]
}
}
return str[start:]
}
var exampleAddress = acm.GeneratePrivateAccountFromSecret("marmot").GetAddress()
// Rules
var (
Placeholder = validation.Match(PlaceholderRegex).Error("must be a variable placeholder like $marmotVariable")
Address = validation.NewStringRule(IsAddress,
fmt.Sprintf("must be valid 20 byte hex-encoded string like '%v'", exampleAddress))
AddressOrPlaceholder = Or(Placeholder, Address)
Relation = validation.In("eq", "ne", "ge", "gt", "le", "lt", "==", "!=", ">=", ">", "<=", "<")
PermissionOrPlaceholder = Or(Placeholder, Permission)
Permission = validation.By(func(value interface{}) error {
str, err := validation.EnsureString(value)
if err != nil {
return fmt.Errorf("must be a permission name, but %v is not a string", value)
}
_, err = permission.PermStringToFlag(str)
if err != nil {
return err
}
return nil
})
Uint64OrPlaceholder = Or(Placeholder, Uint64)
Uint64 = validation.By(func(value interface{}) error {
str, err := validation.EnsureString(value)
if err != nil {
return fmt.Errorf("should be a numeric string but '%v' is not a string", value)
}
_, err = strconv.ParseUint(str, 10, 64)
if err != nil {
return fmt.Errorf("should be a 64 bit unsigned integer: ")
}
return nil
})
)
func Exactly(identity interface{}) validation.Rule {
return validation.By(func(value interface{}) error {
if !reflect.DeepEqual(identity, value) {
return fmt.Errorf("value %v does not exactly match %v", value, identity)
}
return nil
})
}
func Or(rules ...validation.Rule) *orRule {
return &orRule{
rules: rules,
}
}
type orRule struct {
rules []validation.Rule
}
func (orr *orRule) Validate(value interface{}) error {
errs := make([]string, len(orr.rules))
for i, r := range orr.rules {
err := r.Validate(value)
if err == nil {
return nil
}
errs[i] = err.Error()
}
return fmt.Errorf("did not validate any requirements: %s", strings.Join(errs, ", "))
}
func IsAddress(value string) bool {
_, err := crypto.AddressFromHexString(value)
return err == nil
}
// Returns true IFF value is zero value or has length 0
func IsOmitted(value interface{}) bool {
value, isNil := validation.Indirect(value)
if isNil || validation.IsEmpty(value) {
return true
}
// Accept and empty slice or map
length, err := validation.LengthOfValue(value)
if err == nil && length == 0 {
return true
}
return false
}
type boolRule struct {
isValid func(value interface{}) bool
message string
}
func New(isValid func(value interface{}) bool, message string, args ...interface{}) *boolRule {
return &boolRule{
isValid: isValid,
message: fmt.Sprintf(message, args...),
}
}
func (r *boolRule) Validate(value interface{}) error {
if r.isValid(value) {
return nil
}
return errors.New(r.message)
}
func (r *boolRule) Error(message string, args ...interface{}) *boolRule {
r.message = fmt.Sprintf(message, args...)
return r
}