planning

node_modules/graphql/validation/rules/VariablesInAllowedPositionRule.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.VariablesInAllowedPositionRule = VariablesInAllowedPositionRule;
+
+var _inspect = _interopRequireDefault(require("../../jsutils/inspect.js"));
+
+var _GraphQLError = require("../../error/GraphQLError.js");
+
+var _kinds = require("../../language/kinds.js");
+
+var _definition = require("../../type/definition.js");
+
+var _typeFromAST = require("../../utilities/typeFromAST.js");
+
+var _typeComparators = require("../../utilities/typeComparators.js");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Variables passed to field arguments conform to type
+ */
+function VariablesInAllowedPositionRule(context) {
+  var varDefMap = Object.create(null);
+  return {
+    OperationDefinition: {
+      enter: function enter() {
+        varDefMap = Object.create(null);
+      },
+      leave: function leave(operation) {
+        var usages = context.getRecursiveVariableUsages(operation);
+
+        for (var _i2 = 0; _i2 < usages.length; _i2++) {
+          var _ref2 = usages[_i2];
+          var node = _ref2.node;
+          var type = _ref2.type;
+          var defaultValue = _ref2.defaultValue;
+          var varName = node.name.value;
+          var varDef = varDefMap[varName];
+
+          if (varDef && type) {
+            // A var type is allowed if it is the same or more strict (e.g. is
+            // a subtype of) than the expected type. It can be more strict if
+            // the variable type is non-null when the expected type is nullable.
+            // If both are list types, the variable item type can be more strict
+            // than the expected item type (contravariant).
+            var schema = context.getSchema();
+            var varType = (0, _typeFromAST.typeFromAST)(schema, varDef.type);
+
+            if (varType && !allowedVariableUsage(schema, varType, varDef.defaultValue, type, defaultValue)) {
+              var varTypeStr = (0, _inspect.default)(varType);
+              var typeStr = (0, _inspect.default)(type);
+              context.reportError(new _GraphQLError.GraphQLError("Variable \"$".concat(varName, "\" of type \"").concat(varTypeStr, "\" used in position expecting type \"").concat(typeStr, "\"."), [varDef, node]));
+            }
+          }
+        }
+      }
+    },
+    VariableDefinition: function VariableDefinition(node) {
+      varDefMap[node.variable.name.value] = node;
+    }
+  };
+}
+/**
+ * Returns true if the variable is allowed in the location it was found,
+ * which includes considering if default values exist for either the variable
+ * or the location at which it is located.
+ */
+
+
+function allowedVariableUsage(schema, varType, varDefaultValue, locationType, locationDefaultValue) {
+  if ((0, _definition.isNonNullType)(locationType) && !(0, _definition.isNonNullType)(varType)) {
+    var hasNonNullVariableDefaultValue = varDefaultValue != null && varDefaultValue.kind !== _kinds.Kind.NULL;
+    var hasLocationDefaultValue = locationDefaultValue !== undefined;
+
+    if (!hasNonNullVariableDefaultValue && !hasLocationDefaultValue) {
+      return false;
+    }
+
+    var nullableLocationType = locationType.ofType;
+    return (0, _typeComparators.isTypeSubTypeOf)(schema, varType, nullableLocationType);
+  }
+
+  return (0, _typeComparators.isTypeSubTypeOf)(schema, varType, locationType);
+}