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Adam Scarr
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Jul 24, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| package validator | ||
|
|
||
| import ( | ||
| "reflect" | ||
|
|
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| "github.com/vektah/gqlparser/ast" | ||
| "github.com/vektah/gqlparser/gqlerror" | ||
| ) | ||
|
|
||
| // CoerceVariableValues checks the variables for a given operation are valid. mutates variables to include default values where they were not provided | ||
| func CoerceVariableValues(schema *ast.Schema, op *ast.OperationDefinition, variables map[string]interface{}) (map[string]interface{}, *gqlerror.Error) { | ||
| if variables == nil { | ||
| variables = map[string]interface{}{} | ||
| } | ||
| validator := operationValidator{ | ||
| path: []interface{}{"variable"}, | ||
| schema: schema, | ||
| } | ||
|
|
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| for _, v := range op.VariableDefinitions { | ||
| validator.path = append(validator.path, v.Variable) | ||
|
|
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| val, found := variables[v.Variable] | ||
| if !found { | ||
| if v.DefaultValue != nil { | ||
| var err error | ||
| val, err = v.DefaultValue.Value(variables) | ||
| if err != nil { | ||
| return nil, gqlerror.WrapPath(validator.path, err) | ||
| } | ||
| variables[v.Variable] = val | ||
| } else if v.Type.NonNull { | ||
| return nil, gqlerror.ErrorPathf(validator.path, "must be defined") | ||
| } | ||
| } | ||
|
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| rv := reflect.ValueOf(val) | ||
| if rv.Kind() == reflect.Ptr { | ||
| if v.Type.NonNull && rv.IsNil() { | ||
| return nil, gqlerror.ErrorPathf(validator.path, "cannot be null") | ||
| } | ||
| rv = rv.Elem() | ||
| } | ||
|
|
||
| if err := validator.validateVarType(v.Type, rv); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| validator.path = validator.path[0 : len(validator.path)-1] | ||
| } | ||
|
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| return variables, nil | ||
| } | ||
|
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| type operationValidator struct { | ||
| path []interface{} | ||
| schema *ast.Schema | ||
| } | ||
|
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| func (v *operationValidator) validateVarType(typ *ast.Type, val reflect.Value) *gqlerror.Error { | ||
| if typ.Elem != nil { | ||
| if val.Kind() != reflect.Slice { | ||
| return gqlerror.ErrorPathf(v.path, "must be an array") | ||
| } | ||
|
|
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| for i := 0; i < val.Len(); i++ { | ||
| v.path = append(v.path, i) | ||
| field := val.Index(i) | ||
|
|
||
| if field.Kind() == reflect.Ptr { | ||
| if typ.NonNull && field.IsNil() { | ||
| return gqlerror.ErrorPathf(v.path, "cannot be null") | ||
| } | ||
| field = field.Elem() | ||
| } | ||
|
|
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| err := v.validateVarType(typ.Elem, val.Field(i)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| v.path = v.path[0 : len(v.path)-1] | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| def := v.schema.Types[typ.NamedType] | ||
| if def == nil { | ||
| return gqlerror.ErrorPathf(v.path, "missing definition for %s", typ.String()) | ||
| } | ||
|
|
||
| switch def.Kind { | ||
| case ast.Scalar, ast.Enum: | ||
| // todo scalar coercion, assuming valid for now | ||
| case ast.Object: | ||
| return gqlerror.ErrorPathf(v.path, "input objects must be used for inputs") | ||
| case ast.Interface: | ||
| return gqlerror.ErrorPathf(v.path, "interfaces are not currently supported as inputs") | ||
| case ast.Union: | ||
| return gqlerror.ErrorPathf(v.path, "unions are not currently supported as inputs") | ||
| case ast.InputObject: | ||
| if val.Kind() != reflect.Map { | ||
| return gqlerror.ErrorPathf(v.path, "must be a %s", def.Name) | ||
| } | ||
|
|
||
| // check for unknown fields | ||
| for _, name := range val.MapKeys() { | ||
| val.MapIndex(name) | ||
| fieldDef := def.Fields.ForName(name.String()) | ||
| v.path = append(v.path, name) | ||
|
|
||
| if fieldDef == nil { | ||
| return gqlerror.ErrorPathf(v.path, "unknown field %s", fieldDef) | ||
| } | ||
| v.path = v.path[0 : len(v.path)-1] | ||
| } | ||
|
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| for _, fieldDef := range def.Fields { | ||
| v.path = append(v.path, fieldDef.Name) | ||
|
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| field := val.MapIndex(reflect.ValueOf(fieldDef.Name)) | ||
| if !field.IsValid() { | ||
| if fieldDef.Type.NonNull { | ||
| return gqlerror.ErrorPathf(v.path, "must be defined") | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| if field.Kind() == reflect.Ptr { | ||
| if typ.NonNull && field.IsNil() { | ||
| return gqlerror.ErrorPathf(v.path, "cannot be null") | ||
| } | ||
| field = field.Elem() | ||
| } | ||
|
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| err := v.validateVarType(fieldDef.Type, field) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| v.path = v.path[0 : len(v.path)-1] | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| type Query { | ||
| intArg(i: Int!): Boolean! | ||
| structArg(i: InputType!): Boolean! | ||
| arrayArg(i: [InputType!]): Boolean! | ||
| } | ||
|
|
||
| input InputType { | ||
| name: String! | ||
| } |
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