github.com/dgraph-io/dgraph@v1.2.8/graphql/schema/validation_rules.go (about) 1 /* 2 * Copyright 2019 Dgraph Labs, Inc. and Contributors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package schema 18 19 import ( 20 "github.com/vektah/gqlparser/ast" 21 "github.com/vektah/gqlparser/validator" 22 ) 23 24 func listTypeCheck(observers *validator.Events, addError validator.AddErrFunc) { 25 observers.OnValue(func(walker *validator.Walker, value *ast.Value) { 26 if value.Definition == nil || value.ExpectedType == nil { 27 return 28 } 29 30 if value.Kind == ast.Variable { 31 return 32 } 33 34 // ExpectedType.Elem will be not nil if it is of list type. Otherwise 35 // it will be nil. So it's safe to say that value.Kind should be list 36 if !(value.ExpectedType.Elem != nil && value.Kind != ast.ListValue) { 37 return 38 } 39 40 addError(validator.Message("Value provided %s is incompatible with expected type %s", 41 value.String(), 42 value.ExpectedType.String()), validator.At(value.Position)) 43 }) 44 } 45 46 func variableTypeCheck(observers *validator.Events, addError validator.AddErrFunc) { 47 observers.OnValue(func(walker *validator.Walker, value *ast.Value) { 48 if value.Definition == nil || value.ExpectedType == nil || 49 value.VariableDefinition == nil { 50 return 51 } 52 53 if value.Kind != ast.Variable { 54 return 55 } 56 57 if value.VariableDefinition.Type.IsCompatible(value.ExpectedType) { 58 return 59 } 60 61 addError(validator.Message("Variable type provided %s is incompatible with expected type %s", 62 value.VariableDefinition.Type.String(), 63 value.ExpectedType.String()), validator.At(value.Position)) 64 }) 65 }