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request.go
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request.go
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package graphql
import (
"encoding/json"
"errors"
"io"
"io/ioutil"
"net/http"
"github.com/TykTechnologies/graphql-go-tools/pkg/ast"
"github.com/TykTechnologies/graphql-go-tools/pkg/astparser"
"github.com/TykTechnologies/graphql-go-tools/pkg/engine/resolve"
"github.com/TykTechnologies/graphql-go-tools/pkg/middleware/operation_complexity"
"github.com/TykTechnologies/graphql-go-tools/pkg/operationreport"
)
const (
schemaIntrospectionFieldName = "__schema"
typeIntrospectionFieldName = "__type"
)
type OperationType ast.OperationType
const (
OperationTypeUnknown OperationType = OperationType(ast.OperationTypeUnknown)
OperationTypeQuery OperationType = OperationType(ast.OperationTypeQuery)
OperationTypeMutation OperationType = OperationType(ast.OperationTypeMutation)
OperationTypeSubscription OperationType = OperationType(ast.OperationTypeSubscription)
)
var (
ErrEmptyRequest = errors.New("the provided request is empty")
ErrNilSchema = errors.New("the provided schema is nil")
)
type Request struct {
OperationName string `json:"operationName,omitempty"`
Variables json.RawMessage `json:"variables,omitempty"`
Query string `json:"query"`
document ast.Document
isParsed bool
isNormalized bool
request resolve.Request
validForSchema map[uint64]ValidationResult
}
func UnmarshalRequest(reader io.Reader, request *Request) error {
requestBytes, err := ioutil.ReadAll(reader)
if err != nil {
return err
}
if len(requestBytes) == 0 {
return ErrEmptyRequest
}
return json.Unmarshal(requestBytes, &request)
}
func UnmarshalHttpRequest(r *http.Request, request *Request) error {
request.request.Header = r.Header
return UnmarshalRequest(r.Body, request)
}
func MarshalRequest(graphqlRequest Request) ([]byte, error) {
return json.Marshal(graphqlRequest)
}
func MarshalRequestString(graphqlRequest Request) (string, error) {
result, err := MarshalRequest(graphqlRequest)
if err != nil {
return "", err
}
return string(result), nil
}
func (r *Request) SetHeader(header http.Header) {
r.request.Header = header
}
func (r *Request) CalculateComplexity(complexityCalculator ComplexityCalculator, schema *Schema) (ComplexityResult, error) {
if schema == nil {
return ComplexityResult{}, ErrNilSchema
}
report := r.parseQueryOnce()
if report.HasErrors() {
return complexityResult(
operation_complexity.OperationStats{},
[]operation_complexity.RootFieldStats{},
report,
)
}
return complexityCalculator.Calculate(&r.document, &schema.document)
}
func (r Request) Print(writer io.Writer) (n int, err error) {
report := r.parseQueryOnce()
if report.HasErrors() {
return 0, report
}
return writer.Write(r.document.Input.RawBytes)
}
func (r *Request) IsNormalized() bool {
return r.isNormalized
}
func (r *Request) parseQueryOnce() (report operationreport.Report) {
if r.isParsed {
return report
}
r.document, report = astparser.ParseGraphqlDocumentString(r.Query)
if !report.HasErrors() {
// If the given query has problems, and we failed to parse it,
// we shouldn't mark it as parsed. It can be misleading for
// the rest of the components. See TT-5704.
r.isParsed = true
}
return report
}
func (r *Request) scanOperationDefinitionsFindSelectionSet() (selectionSet *ast.SelectionSet, err error) {
report := r.parseQueryOnce()
if report.HasErrors() {
return nil, report
}
var operationDefinitionRef = ast.InvalidRef
var possibleOperationDefinitionRefs = make([]int, 0)
for i := 0; i < len(r.document.RootNodes); i++ {
if r.document.RootNodes[i].Kind == ast.NodeKindOperationDefinition {
possibleOperationDefinitionRefs = append(possibleOperationDefinitionRefs, r.document.RootNodes[i].Ref)
}
}
if len(possibleOperationDefinitionRefs) == 0 {
return nil, nil
} else if len(possibleOperationDefinitionRefs) == 1 {
operationDefinitionRef = possibleOperationDefinitionRefs[0]
} else {
for i := 0; i < len(possibleOperationDefinitionRefs); i++ {
ref := possibleOperationDefinitionRefs[i]
name := r.document.OperationDefinitionNameString(ref)
if r.OperationName == name {
operationDefinitionRef = ref
break
}
}
}
if operationDefinitionRef == ast.InvalidRef {
return
}
operationDef := r.document.OperationDefinitions[operationDefinitionRef]
if operationDef.OperationType != ast.OperationTypeQuery {
return
}
if !operationDef.HasSelections {
return
}
selectionSet = &r.document.SelectionSets[operationDef.SelectionSet]
if len(selectionSet.SelectionRefs) == 0 {
return
}
return selectionSet, nil
}
func (r *Request) scanFragmentDefinitionsFindSelectionSets() ([]*ast.SelectionSet, error) {
report := r.parseQueryOnce()
if report.HasErrors() {
return nil, report
}
// See the following constants:
//
// * inlineFragmentedIntrospectionQueryWithFragmentOnQuery
// * inlineFragmentedIntrospectionQueryType
// * fragmentedIntrospectionQuery
var selectionSets []*ast.SelectionSet
for i := 0; i < len(r.document.FragmentDefinitions); i++ {
fragment := r.document.FragmentDefinitions[i]
if fragment.HasSelections {
if fragment.SelectionSet == ast.InvalidRef {
continue
}
selectionSet := r.document.SelectionSets[fragment.SelectionSet]
selectionSets = append(selectionSets, &selectionSet)
}
}
for i := 0; i < len(r.document.InlineFragments); i++ {
inlineFragment := r.document.InlineFragments[i]
if inlineFragment.HasSelections {
if inlineFragment.SelectionSet == ast.InvalidRef {
continue
}
selectionSet := r.document.SelectionSets[inlineFragment.SelectionSet]
selectionSets = append(selectionSets, &selectionSet)
}
}
return selectionSets, nil
}
func (r *Request) IsIntrospectionQuery() (result bool, err error) {
selectionSet, err := r.scanOperationDefinitionsFindSelectionSet()
if err != nil {
return
}
if selectionSet == nil {
return
}
for i := 0; i < len(selectionSet.SelectionRefs); i++ {
selection := r.document.Selections[selectionSet.SelectionRefs[i]]
if selection.Kind != ast.SelectionKindField {
continue
}
fieldName := r.document.FieldNameUnsafeString(selection.Ref)
switch fieldName {
case schemaIntrospectionFieldName, typeIntrospectionFieldName:
continue
default:
return
}
}
return true, nil
}
// IsIntrospectionQueryStrict returns true if the client tries to query __schema or __type fields in any way.
// IsIntrospectionQuery returns false if schema/type introspection query contains additional non-introspection fields.
// This breaks the granular access schema of Tyk Gateway.
func (r *Request) IsIntrospectionQueryStrict() (result bool, err error) {
selectionSets, err := r.scanFragmentDefinitionsFindSelectionSets()
if err != nil {
return
}
selectionSet, err := r.scanOperationDefinitionsFindSelectionSet()
if err != nil {
return
}
if selectionSet != nil {
selectionSets = append(selectionSets, selectionSet)
}
for _, selectionSetItem := range selectionSets {
for i := 0; i < len(selectionSetItem.SelectionRefs); i++ {
selection := r.document.Selections[selectionSetItem.SelectionRefs[i]]
if selection.Kind != ast.SelectionKindField {
continue
}
fieldName := r.document.FieldNameUnsafeString(selection.Ref)
switch fieldName {
case schemaIntrospectionFieldName, typeIntrospectionFieldName:
// The query wants to access an introspection field, return true.
return true, nil
default:
// non-introspection field, continue scanning.
continue
}
}
}
return
}
func (r *Request) OperationType() (OperationType, error) {
report := r.parseQueryOnce()
if report.HasErrors() {
return OperationTypeUnknown, report
}
for _, rootNode := range r.document.RootNodes {
if rootNode.Kind != ast.NodeKindOperationDefinition {
continue
}
if r.OperationName != "" && r.document.OperationDefinitionNameString(rootNode.Ref) != r.OperationName {
continue
}
opType := r.document.OperationDefinitions[rootNode.Ref].OperationType
return OperationType(opType), nil
}
return OperationTypeUnknown, nil
}