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resolve_input_templates.go
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/
resolve_input_templates.go
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package postprocess
import (
"strconv"
"strings"
"github.com/TykTechnologies/graphql-go-tools/v2/pkg/engine/plan"
"github.com/TykTechnologies/graphql-go-tools/v2/pkg/engine/resolve"
)
// ResolveInputTemplates is a postprocessor that resolves input template
type ResolveInputTemplates struct{}
func (d *ResolveInputTemplates) Process(pre plan.Plan) plan.Plan {
switch t := pre.(type) {
case *plan.SynchronousResponsePlan:
d.traverseNode(t.Response.Data)
case *plan.SubscriptionResponsePlan:
d.traverseTrigger(&t.Response.Trigger)
d.traverseNode(t.Response.Response.Data)
}
return pre
}
func (d *ResolveInputTemplates) traverseNode(node resolve.Node) {
switch n := node.(type) {
case *resolve.Object:
d.traverseFetch(n.Fetch)
for i := range n.Fields {
d.traverseNode(n.Fields[i].Value)
}
case *resolve.Array:
d.traverseNode(n.Item)
}
}
func (d *ResolveInputTemplates) traverseFetch(fetch resolve.Fetch) {
if fetch == nil {
return
}
switch f := fetch.(type) {
case *resolve.SingleFetch:
d.traverseSingleFetch(f)
case *resolve.MultiFetch:
for i := range f.Fetches {
d.traverseFetch(f.Fetches[i])
}
default:
// at this point, we should not have any other types of fetches
// as from planner we could get only SingleFetch and MultiFetch
// other types of fetches are created only during postprocessing via CreateConcreteSingleFetchTypes postprocessor
}
}
func (d *ResolveInputTemplates) traverseTrigger(trigger *resolve.GraphQLSubscriptionTrigger) {
d.resolveInputTemplate(trigger.Variables, string(trigger.Input), &trigger.InputTemplate)
trigger.Input = nil
trigger.Variables = nil
}
func (d *ResolveInputTemplates) traverseSingleFetch(fetch *resolve.SingleFetch) {
d.resolveInputTemplate(fetch.Variables, fetch.Input, &fetch.InputTemplate)
fetch.Input = ""
fetch.Variables = nil
fetch.InputTemplate.SetTemplateOutputToNullOnVariableNull = fetch.SetTemplateOutputToNullOnVariableNull
fetch.SetTemplateOutputToNullOnVariableNull = false
}
func (d *ResolveInputTemplates) resolveInputTemplate(variables resolve.Variables, input string, template *resolve.InputTemplate) {
if input == "" {
return
}
if !strings.Contains(input, "$$") {
template.Segments = append(template.Segments, resolve.TemplateSegment{
SegmentType: resolve.StaticSegmentType,
Data: []byte(input),
})
return
}
segments := strings.Split(input, "$$")
isVariable := false
for _, seg := range segments {
switch {
case isVariable:
i, _ := strconv.Atoi(seg)
variableTemplateSegment := (variables)[i].TemplateSegment()
template.Segments = append(template.Segments, variableTemplateSegment)
isVariable = false
default:
template.Segments = append(template.Segments, resolve.TemplateSegment{
SegmentType: resolve.StaticSegmentType,
Data: []byte(seg),
})
isVariable = true
}
}
}