Merge pull request from GHSA-j5g3-5c8r-7qfx

If a provided API key had characters that were invalid as
header values, usage reporting and schema reporting requests
would fail and log the API key.

This change implements two fixes to improve this:
* Trim the API key of any whitespace and log a warning
* Throw an error on startup if the key contains invalid characters
  after being `.trim()`med.

packages/apollo-server-core/src/__tests__/ApolloServerBase.test.ts

@@ -103,6 +103,43 @@ describe('ApolloServerBase construction', () => {
       `"Apollo Server requires either an existing schema, modules or typeDefs"`,
     );
   });
+
+  it('throws when an API key is not a valid header value', () => {
+    expect(() => {
+      new ApolloServerBase({
+        typeDefs,
+        resolvers,
+        apollo: {
+          key: 'bar▒baz▒',
+        },
+      });
+    }).toThrowErrorMatchingInlineSnapshot(
+      `"The API key provided to Apollo Server contains characters which are invalid as HTTP header values. The following characters found in the key are invalid: ▒, ▒. Valid header values may only contain ASCII visible characters. If you think there is an issue with your key, please contact Apollo support."`,
+    );
+  });
+
+  it('trims whitespace from incoming API keys and logs a warning', () => {
+    const logger = {
+      debug: jest.fn(),
+      info: jest.fn(),
+      warn: jest.fn(),
+      error: jest.fn(),
+    };
+    expect(() => {
+      new ApolloServerBase({
+        typeDefs,
+        resolvers,
+        apollo: {
+          key: 'barbaz\n',
+        },
+        logger,
+      });
+    }).not.toThrow();
+    expect(logger.warn).toHaveBeenCalledWith(
+      'The provided API key has unexpected leading or trailing whitespace. ' +
+        'Apollo Server will trim the key value before use.',
+    );
+  });
 });
 
 describe('ApolloServerBase start', () => {

packages/apollo-server-core/src/determineApolloConfig.ts

@@ -34,21 +34,34 @@ export function determineApolloConfig(
 
   // Determine key.
   if (input?.key) {
-    apolloConfig.key = input.key;
+    apolloConfig.key = input.key.trim();
   } else if (typeof engine === 'object' && engine.apiKey) {
-    apolloConfig.key = engine.apiKey;
+    apolloConfig.key = engine.apiKey.trim();
   } else if (APOLLO_KEY) {
     if (ENGINE_API_KEY) {
       logger.warn(
         'Using `APOLLO_KEY` since `ENGINE_API_KEY` (deprecated) is also set in the environment.',
       );
     }
-    apolloConfig.key = APOLLO_KEY;
+    apolloConfig.key = APOLLO_KEY.trim();
   } else if (ENGINE_API_KEY) {
     logger.warn(
       '[deprecated] The `ENGINE_API_KEY` environment variable has been renamed to `APOLLO_KEY`.',
     );
-    apolloConfig.key = ENGINE_API_KEY;
+    apolloConfig.key = ENGINE_API_KEY.trim();
+  }
+
+  if ((input?.key ?? APOLLO_KEY ?? ENGINE_API_KEY) !== apolloConfig.key) {
+    logger.warn(
+      'The provided API key has unexpected leading or trailing whitespace. ' +
+        'Apollo Server will trim the key value before use.',
+    );
+  }
+
+  // Assert API key is a valid header value, since it's going to be used as one
+  // throughout.
+  if (apolloConfig.key) {
+    assertValidHeaderValue(apolloConfig.key);
   }
 
   // Determine key hash.
@@ -155,3 +168,17 @@ export function determineApolloConfig(
 
   return apolloConfig as ApolloConfig; // can remove cast in AS3
 }
+
+function assertValidHeaderValue(value: string) {
+  // Ref: node-fetch@2.x `Headers` validation
+  // https://github.com/node-fetch/node-fetch/blob/9b9d45881e5ca68757077726b3c0ecf8fdca1f29/src/headers.js#L18
+  const invalidHeaderCharRegex = /[^\t\x20-\x7e\x80-\xff]/g;
+  if (invalidHeaderCharRegex.test(value)) {
+    const invalidChars = value.match(invalidHeaderCharRegex)!;
+    throw new Error(
+      `The API key provided to Apollo Server contains characters which are invalid as HTTP header values. The following characters found in the key are invalid: ${invalidChars.join(
+        ', ',
+      )}. Valid header values may only contain ASCII visible characters. If you think there is an issue with your key, please contact Apollo support.`,
+    );
+  }
+}