Handle variable parse error

CHANGELOG.md

@@ -9,6 +9,8 @@
 [PR #127](https://github.com/apollostack/apollo-server/pull/127)
 * Camelcase Hapi.  Issue #129. ([@nnance](https://github.com/nnance)) in
 [PR #132](https://github.com/apollostack/apollo-server/pull/132)
+* Fix error handling when parsing variables parameter. Issue #130. ([@nnance](https://github.com/nnance)) in
+[PR #131](https://github.com/apollostack/apollo-server/pull/131)
 
 ### v0.2.6
 * Expose the OperationStore as part of the public API. ([@nnance](https://github.com/nnance))

src/integrations/expressApollo.ts

@@ -77,8 +77,14 @@ export function apolloExpress(options: ApolloOptions | ExpressApolloOptionsFunct
         let variables = requestParams.variables;
 
         if (typeof variables === 'string') {
-          // TODO: catch errors
-          variables = JSON.parse(variables);
+          try {
+            variables = JSON.parse(variables);
+          } catch (error) {
+            res.statusCode = 400;
+            res.write('Variables are invalid JSON.');
+            res.end();
+            return;
+          }
         }
 
         let params = {

src/integrations/integrations.test.ts

@@ -228,6 +228,20 @@ export default (createApp: CreateAppFunc, destroyApp?: DestroyAppFunc) => {
           });
       });
 
+      it('can handle a request with variables as an invalid string', () => {
+          app = createApp();
+          const req = request(app)
+              .post('/graphql')
+              .send({
+                  query: 'query test($echo: String!){ testArgument(echo: $echo) }',
+                  variables: '{ echo: "world" }',
+              });
+          return req.then((res) => {
+              expect(res.status).to.equal(400);
+              return expect(res.error.text).to.contain('Variables are invalid JSON.');
+          });
+      });
+
       it('can handle a request with operationName', () => {
           app = createApp();
           const expected = {

src/integrations/koaApollo.ts

@@ -56,8 +56,12 @@ export function apolloKoa(options: ApolloOptions | KoaApolloOptionsFunction): Ko
         let variables = requestParams.variables;
 
         if (typeof variables === 'string') {
-          // TODO: catch errors
-          variables = JSON.parse(variables);
+          try {
+            variables = JSON.parse(variables);
+          } catch (error) {
+            ctx.status = 400;
+            return ctx.body = 'Variables are invalid JSON.';
+          }
         }
 
         let params = {