http: require json bodies to be an object.

lib/http/base.js

@@ -329,6 +329,8 @@ HTTPBase.prototype.parseBody = async function parseBody(req, options) {
   switch (type) {
     case 'json':
       body = JSON.parse(data);
+      if (!body || typeof body !== 'object' || Array.isArray(body))
+        throw new Error('JSON body must be an object.');
       break;
     case 'form':
       body = parsePairs(data, options.keyLimit);

lib/http/request.js

@@ -202,16 +202,16 @@ RequestOptions.prototype.isExpected = function isExpected(type) {
   return this.expect === type;
 };
 
-RequestOptions.prototype.isOverflow = function isOverflow(length) {
-  if (!length)
+RequestOptions.prototype.isOverflow = function isOverflow(hdr) {
+  if (!hdr)
     return false;
 
   if (!this.buffer)
     return false;
 
-  length = parseInt(length, 10);
+  const length = parseInt(hdr, 10);
 
-  if (length !== length)
+  if (!isFinite(length))
     return true;
 
   return length > this.limit;
@@ -293,9 +293,10 @@ function Request(options) {
   this.total = 0;
   this.decoder = null;
   this.body = null;
+  this.buffer = null;
 }
 
-Request.prototype.__proto__ = Stream.prototype;
+Object.setPrototypeOf(Request.prototype, Stream.prototype);
 
 Request.prototype.startTimeout = function startTimeout() {
   if (!this.options.timeout)
@@ -395,27 +396,58 @@ Request.prototype.finish = function finish(err) {
 
   this.cleanup();
 
-  if (this.options.buffer && this.body) {
+  if (this.options.buffer) {
+    assert(this.buffer != null);
     switch (this.type) {
-      case 'bin':
-        this.body = Buffer.concat(this.body);
+      case 'bin': {
+        this.body = Buffer.concat(this.buffer);
+        this.buffer = null;
         break;
-      case 'json':
+      }
+      case 'json': {
+        const buffer = this.buffer.trim();
+
+        this.buffer = null;
+
+        if (buffer.length === 0)
+          break;
+
+        let body;
         try {
-          this.body = JSON.parse(this.body);
+          body = JSON.parse(buffer);
         } catch (e) {
           this.emit('error', e);
           return;
         }
+
+        if (!body || typeof body !== 'object') {
+          this.emit('error', new Error('JSON body is a non-object.'));
+          return;
+        }
+
+        this.body = body;
+
         break;
-      case 'form':
+      }
+      case 'form': {
+        const buffer = this.buffer;
+
+        this.buffer = null;
+
         try {
-          this.body = qs.parse(this.body);
+          this.body = qs.parse(buffer);
         } catch (e) {
           this.emit('error', e);
           return;
         }
+
         break;
+      }
+      default: {
+        this.body = this.buffer;
+        this.buffer = null;
+        break;
+      }
     }
   }
 
@@ -469,9 +501,9 @@ Request.prototype._onResponse = function _onResponse(response) {
   if (this.options.buffer) {
     if (this.type !== 'bin') {
       this.decoder = new StringDecoder('utf8');
-      this.body = '';
+      this.buffer = '';
     } else {
-      this.body = [];
+      this.buffer = [];
     }
   }
 };
@@ -488,11 +520,13 @@ Request.prototype._onData = function _onData(data) {
         return;
       }
     }
+
     if (this.decoder) {
-      this.body += this.decoder.write(data);
+      this.buffer += this.decoder.write(data);
       return;
     }
-    this.body.push(data);
+
+    this.buffer.push(data);
   }
 };