-
Notifications
You must be signed in to change notification settings - Fork 7
/
validate.go
135 lines (130 loc) · 3.65 KB
/
validate.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
// Copyright 2018 Adam S Levy
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
package jsonrpc2
import (
"encoding/json"
"fmt"
)
// validateID assumes that id is valid JSON and returns true if len(id) == 0,
// or id represents a JSON Number, String or Null.
//
// From the JSONRPC 2.0 Spec:
//
// id
// An identifier established by the Client that MUST contain a String,
// Number, or NULL value if included.
//
// Below is the JSON grammar for String, Number and Null from JSON.org.
// value
// string
// number
// "null"
//
// string
// '"' characters '"'
//
// number
// integer fraction exponent
//
// integer
// digit
// onenine digits
// '-' digit
// '-' onenine digits
//
// digits
// digit
// digit digits
//
// digit
// '0'
// onenine
//
// onenine
// '1' . '9'
//
// fraction
// ""
// '.' digits
//
// exponent
// ""
// 'E' sign digits
// 'e' sign digits
//
// Thus if we know that we are working with valid JSON, we can determine the
// JSON type by the first byte alone.
func validateID(id json.RawMessage) error {
if len(id) == 0 {
return fmt.Errorf(`invalid "id": empty`)
}
b := id[0]
if b == 'n' || // null
b == '"' || // string
isNumber(b) {
return nil
}
return fmt.Errorf(`invalid "id": not a number, string, or null`)
}
func isNumber(b byte) bool {
if b == '-' || ('0' <= b && b <= '9') || // integer
b == 'E' || b == 'e' || // exponent
b == '.' { // fraction
return true
}
return false
}
// validateParams assumes that params is valid JSON and returns true if params is
// nil, or if it represents a structured value (Array or Object), or Null.
//
// From the JSONRPC 2.0 Spec:
//
// params
// A Structured value that holds the parameter values to be used during
// the invocation of the method. This member MAY be omitted.
//
// Below is the JSON grammar for Object, Array and Null from JSON.org.
// value
// object
// array
// "null"
//
// object
// '{' ws '}'
// '{' members '}'
//
// array
// '[' ws ']'
// '[' elements ']'
//
// Thus if we know that we are working with valid JSON, we can determine the
// JSON type by the first byte alone.
func validateParams(params json.RawMessage) error {
if len(params) == 0 {
return fmt.Errorf(`invalid "params": empty`)
}
b := params[0]
if b == 'n' || // null
b == '[' || // array
b == '{' { // object
return nil
}
return fmt.Errorf(`invalid "params": not an object, array, or null`)
}