graph, graphql: Properly validate GraphQL queries before executing them

Uses `graphql-tools-rs` for the actual validation.

Validation can be turned off by setting `DISABLE_GRAPHQL_VALIDATIONS=true` in the environment.

core/tests/interfaces.rs

@@ -279,9 +279,11 @@ async fn follow_interface_reference_invalid() {
         .unwrap();
 
     match &res.to_result().unwrap_err()[0] {
-        QueryError::ExecutionError(QueryExecutionError::UnknownField(_, type_name, field_name)) => {
-            assert_eq!(type_name, "Legged");
-            assert_eq!(field_name, "parent");
+        QueryError::ExecutionError(QueryExecutionError::ValidationError(_, error_message)) => {
+            assert_eq!(
+                error_message,
+                "Cannot query field \"parent\" on type \"Legged\"."
+            );
         }
         e => panic!("error {} is not the expected one", e),
     }
@@ -1424,7 +1426,7 @@ async fn recursive_fragment() {
         .await
         .unwrap();
     let data = res.to_result().unwrap_err()[0].to_string();
-    assert_eq!(data, "query has fragment cycle including `FooFrag`");
+    assert_eq!(data, "Cannot spread fragment \"FooFrag\" within itself.");
 
     let co_recursive = "
         query {
@@ -1451,5 +1453,8 @@ async fn recursive_fragment() {
         .await
         .unwrap();
     let data = res.to_result().unwrap_err()[0].to_string();
-    assert_eq!(data, "query has fragment cycle including `BarFrag`");
+    assert_eq!(
+        data,
+        "Cannot spread fragment \"BarFrag\" within itself via \"FooFrag\"."
+    );
 }

graph/src/data/query/error.rs

@@ -41,6 +41,7 @@ pub enum QueryExecutionError {
     AbstractTypeError(String),
     InvalidArgumentError(Pos, String, q::Value),
     MissingArgumentError(Pos, String),
+    ValidationError(Option<Pos>, String),
     InvalidVariableTypeError(Pos, String),
     MissingVariableError(Pos, String),
     ResolveEntitiesError(String),
@@ -137,6 +138,7 @@ impl QueryExecutionError {
             | DeploymentReverted
             | SubgraphManifestResolveError(_)
             | InvalidSubgraphManifest
+            | ValidationError(_, _)
             | ResultTooBig(_, _) => false,
         }
     }
@@ -161,6 +163,9 @@ impl fmt::Display for QueryExecutionError {
             OperationNotFound(s) => {
                 write!(f, "Operation name not found `{}`", s)
             }
+            ValidationError(_pos, message) => {
+                write!(f, "{}", message)
+            }
             NotSupported(s) => write!(f, "Not supported: {}", s),
             NoRootSubscriptionObjectType => {
                 write!(f, "No root Subscription type defined in the schema")

graphql/Cargo.toml

@@ -8,6 +8,7 @@ crossbeam = "0.8"
 futures01 = { package="futures", version="0.1.29" }
 graph = { path = "../graph" }
 graphql-parser = "0.4.0"
+graphql-tools = "0.0.15"
 indexmap = "1.7"
 Inflector = "0.11.3"
 lazy_static = "1.2.0"

graphql/src/execution/query.rs

@@ -1,4 +1,7 @@
 use graphql_parser::Pos;
+use graphql_tools::validation::rules::*;
+use graphql_tools::validation::validate::{validate, ValidationPlan};
+use lazy_static::lazy_static;
 use std::collections::{HashMap, HashSet};
 use std::hash::{Hash, Hasher};
 use std::sync::Arc;
@@ -9,11 +12,10 @@ use graph::data::graphql::{
     ext::{DocumentExt, TypeExt},
     ObjectOrInterface,
 };
+use graph::data::query::QueryExecutionError;
 use graph::data::query::{Query as GraphDataQuery, QueryVariables};
 use graph::data::schema::ApiSchema;
-use graph::prelude::{
-    info, o, q, r, s, BlockNumber, CheapClone, Logger, QueryExecutionError, TryFromValue,
-};
+use graph::prelude::{info, o, q, r, s, BlockNumber, CheapClone, Logger, TryFromValue};
 
 use crate::introspection::introspection_schema;
 use crate::query::{ast as qast, ext::BlockConstraint};
@@ -23,6 +25,41 @@ use crate::{
     schema::api::ErrorPolicy,
 };
 
+lazy_static! {
+    static ref GRAPHQL_VALIDATION_PLAN: ValidationPlan = ValidationPlan::from(
+        if std::env::var("DISABLE_GRAPHQL_VALIDATIONS")
+            .unwrap_or_else(|_| "false".into())
+            .parse::<bool>()
+            .unwrap_or_else(|_| false)
+        {
+            vec![]
+        } else {
+            vec![
+                Box::new(UniqueOperationNames {}),
+                Box::new(LoneAnonymousOperation {}),
+                Box::new(SingleFieldSubscriptions {}),
+                Box::new(KnownTypeNames {}),
+                Box::new(FragmentsOnCompositeTypes {}),
+                Box::new(VariablesAreInputTypes {}),
+                Box::new(LeafFieldSelections {}),
+                Box::new(FieldsOnCorrectType {}),
+                Box::new(UniqueFragmentNames {}),
+                Box::new(KnownFragmentNames {}),
+                Box::new(NoUnusedFragments {}),
+                Box::new(OverlappingFieldsCanBeMerged {}),
+                Box::new(NoFragmentsCycle {}),
+                Box::new(PossibleFragmentSpreads {}),
+                Box::new(NoUnusedVariables {}),
+                Box::new(NoUndefinedVariables {}),
+                Box::new(KnownArgumentNames {}),
+                Box::new(UniqueArgumentNames {}),
+                Box::new(UniqueVariableNames {}),
+                Box::new(ProvidedRequiredArguments {}),
+            ]
+        }
+    );
+}
+
 #[derive(Clone, Debug)]
 pub enum ComplexityError {
     TooDeep,
@@ -115,6 +152,21 @@ impl Query {
         max_complexity: Option<u64>,
         max_depth: u8,
     ) -> Result<Arc<Self>, Vec<QueryExecutionError>> {
+        let validation_errors = validate(
+            &schema.document(),
+            &query.document,
+            &GRAPHQL_VALIDATION_PLAN,
+        );
+
+        if validation_errors.len() > 0 {
+            return Err(validation_errors
+                .into_iter()
+                .map(|e| {
+                    QueryExecutionError::ValidationError(e.locations.first().cloned(), e.message)
+                })
+                .collect());
+        }
+
         let mut operation = None;
         let mut fragments = HashMap::new();
         for defn in query.document.definitions.into_iter() {

graphql/tests/query.rs

@@ -895,17 +895,18 @@ fn query_complexity_subscriptions() {
                 "subscription {
                 musicians(orderBy: id) {
                     name
-                    bands(first: 100, orderBy: id) {
+                    t1: bands(first: 100, orderBy: id) {
                         name
                         members(first: 100, orderBy: id) {
                             name
                         }
                     }
-                }
-                __schema {
-                    types {
-                        name
-                    }
+                    t2: bands(first: 200, orderBy: id) {
+                      name
+                      members(first: 100, orderBy: id) {
+                          name
+                      }
+                  }
                 }
             }",
             )
@@ -932,12 +933,12 @@ fn query_complexity_subscriptions() {
             result_size: result_size_metrics(),
         };
 
-        // The extra introspection causes the complexity to go over.
         let result = execute_subscription(Subscription { query }, schema, options);
+
         match result {
-            Err(SubscriptionError::GraphQLError(e)) => match e[0] {
-                QueryExecutionError::TooComplex(1_010_200, _) => (), // Expected
-                _ => panic!("did not catch complexity"),
+            Err(SubscriptionError::GraphQLError(e)) => match &e[0] {
+                QueryExecutionError::TooComplex(3_030_100, _) => (), // Expected
+                e => panic!("did not catch complexity: {:?}", e),
             },
             _ => panic!("did not catch complexity"),
         }