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
|
package graphql
import (
"context"
"fmt"
"github.com/vektah/gqlparser/ast"
)
type ExecutableSchema interface {
Schema() *ast.Schema
Complexity(typeName, fieldName string, childComplexity int, args map[string]interface{}) (int, bool)
Query(ctx context.Context, op *ast.OperationDefinition) *Response
Mutation(ctx context.Context, op *ast.OperationDefinition) *Response
Subscription(ctx context.Context, op *ast.OperationDefinition) func() *Response
}
// CollectFields returns the set of fields from an ast.SelectionSet where all collected fields satisfy at least one of the GraphQL types
// passed through satisfies. Providing an empty or nil slice for satisfies will return collect all fields regardless of fragment
// type conditions.
func CollectFields(reqCtx *RequestContext, selSet ast.SelectionSet, satisfies []string) []CollectedField {
return collectFields(reqCtx, selSet, satisfies, map[string]bool{})
}
func collectFields(reqCtx *RequestContext, selSet ast.SelectionSet, satisfies []string, visited map[string]bool) []CollectedField {
groupedFields := make([]CollectedField, 0, len(selSet))
for _, sel := range selSet {
switch sel := sel.(type) {
case *ast.Field:
if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
continue
}
f := getOrCreateAndAppendField(&groupedFields, sel.Alias, func() CollectedField {
return CollectedField{Field: sel}
})
f.Selections = append(f.Selections, sel.SelectionSet...)
case *ast.InlineFragment:
if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
continue
}
if len(satisfies) > 0 && !instanceOf(sel.TypeCondition, satisfies) {
continue
}
for _, childField := range collectFields(reqCtx, sel.SelectionSet, satisfies, visited) {
f := getOrCreateAndAppendField(&groupedFields, childField.Name, func() CollectedField { return childField })
f.Selections = append(f.Selections, childField.Selections...)
}
case *ast.FragmentSpread:
if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
continue
}
fragmentName := sel.Name
if _, seen := visited[fragmentName]; seen {
continue
}
visited[fragmentName] = true
fragment := reqCtx.Doc.Fragments.ForName(fragmentName)
if fragment == nil {
// should never happen, validator has already run
panic(fmt.Errorf("missing fragment %s", fragmentName))
}
if len(satisfies) > 0 && !instanceOf(fragment.TypeCondition, satisfies) {
continue
}
for _, childField := range collectFields(reqCtx, fragment.SelectionSet, satisfies, visited) {
f := getOrCreateAndAppendField(&groupedFields, childField.Name, func() CollectedField { return childField })
f.Selections = append(f.Selections, childField.Selections...)
}
default:
panic(fmt.Errorf("unsupported %T", sel))
}
}
return groupedFields
}
type CollectedField struct {
*ast.Field
Selections ast.SelectionSet
}
func instanceOf(val string, satisfies []string) bool {
for _, s := range satisfies {
if val == s {
return true
}
}
return false
}
func getOrCreateAndAppendField(c *[]CollectedField, name string, creator func() CollectedField) *CollectedField {
for i, cf := range *c {
if cf.Alias == name {
return &(*c)[i]
}
}
f := creator()
*c = append(*c, f)
return &(*c)[len(*c)-1]
}
func shouldIncludeNode(directives ast.DirectiveList, variables map[string]interface{}) bool {
if len(directives) == 0 {
return true
}
skip, include := false, true
if d := directives.ForName("skip"); d != nil {
skip = resolveIfArgument(d, variables)
}
if d := directives.ForName("include"); d != nil {
include = resolveIfArgument(d, variables)
}
return !skip && include
}
func resolveIfArgument(d *ast.Directive, variables map[string]interface{}) bool {
arg := d.Arguments.ForName("if")
if arg == nil {
panic(fmt.Sprintf("%s: argument 'if' not defined", d.Name))
}
value, err := arg.Value.Value(variables)
if err != nil {
panic(err)
}
ret, ok := value.(bool)
if !ok {
panic(fmt.Sprintf("%s: argument 'if' is not a boolean", d.Name))
}
return ret
}
|
