Add read-only access to POST data for webRequest's onBeforeRequest

chrome/common/extensions/api/web_request.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "webRequest",
     "types": [
       {
         "id": "RequestFilter",
@@ skipping 61 matching lines @@
           "authCredentials": {
             "type": "object",
             "description": "Only used as a response to the onAuthRequired event. If set, the request is made using the supplied credentials.",
             "optional": true,
             "properties": {
               "username": {"type": "string"},
               "password": {"type": "string"}
             }
           }
         }
+      },
+      {
+        "id": "UploadData",
+        "type": "object",
+        "properties": {
+          "bytes": {
+              "type": "any",
+              "optional": true,
+              "description": "An ArrayBuffer with a copy of the data."
+          },
+          "file": {
+              "type": "string",
+              "optional": true,
+              "description": "A string with the file's path and name."
+          }
+        },
+        "description": "Contains data uploaded in a URL request."
       }
     ],
     "functions": [
       {
         "name": "handlerBehaviorChanged",
         "type": "function",
         "description": "Needs to be called when the behavior of the webRequest handlers has changed to prevent incorrect handling due to caching. This function call is expensive. Don't call it often.",
         "parameters": [
           {"type": "function", "name": "callback", "optional": true, "parameters": []}
         ]
       }
     ],
     "events": [
       {
         "name": "onBeforeRequest",
         "type": "function",
         "description": "Fired when a request is about to occur.",
         "parameters": [
           {
             "type": "object",
             "name": "details",
             "properties": {
               "requestId": {"type": "string", "description": "The ID of the request. Request IDs are unique within a browser session. As a result, they could be used to relate different events of the same request."},
               "url": {"type": "string"},
               "method": {"type": "string", "description": "Standard HTTP method."},
               "frameId": {"type": "integer", "description": "The value 0 indicates that the request happens in the main frame; a positive value indicates the ID of a subframe in which the request happens. If the document of a (sub-)frame is loaded (<code>type</code> is <code>main_frame</code> or <code>sub_frame</code>), <code>frameId</code> indicates the ID of this frame, not the ID of the outer frame. Frame IDs are unique within a tab."},
               "parentFrameId": {"type": "integer", "description": "ID of frame that wraps the frame which sent the request. Set to -1 if no parent frame exists."},
+              "requestBody": {
+                "type": "object",
+                "optional": true,
+                "description": "Experimental feature, only available in DEV or CANARY channels. Container for request body data. Only provided if extraInfoSpec contains 'requestBody'. Currently only request body elements containing byte data or files are reported.",
+                "properties": {
+                  "error": {"type": "string", "optional": true, "description": "Errors when obtaining request body data."},
+                  "formData": {
+                    "type": "object",
+                    "optional": true,
+                    "description": "If the request method is POST and the body is a sequence of key-value pairs encoded in UTF8, encoded as either multipart/form-data, or application/x-www-form-urlencoded, this dictionary is present and for each key contains the list of all values for that key. If the data is of another media type, or if it is malformed, the dictionary is not present. An example value of this dictionary is {'key': ['value1', 'value2']}.",
+                    "properties": {},
+                    "additionalProperties": {
+                      "type": "array",
+                      "items": { "type": "string" }
+                    }
+                  },
+                  "raw" : {
+                    "type": "array",
+                    "optional": true,
+                    "items": {"$ref": "UploadData"},
+                    "description": "If the request method is PUT or POST, and the body is not already parsed in formData, then the unparsed request body elements are contained in this array."
+                  }
+                }
+              },
               "tabId": {"type": "integer", "description": "The ID of the tab in which the request takes place. Set to -1 if the request isn't related to a tab."},
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
-              "enum": ["blocking"]
+              "enum": ["blocking", "requestBody"]
             }
           }
         ],
         "returns": {
           "$ref": "BlockingResponse",
           "description": "If \"blocking\" is specified in the \"extraInfoSpec\" parameter, the event listener should return an object of this type.",
           "optional": true
         }
       },
       {
@@ skipping 338 matching lines @@
           {
             "$ref": "RequestFilter",
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           }
         ]
       }
     ]
   }
 ]