How to track user activity data on google docs - google-api

Question

I wonder if it is possible to track user activity data on google docs. My goal is to know what changes the users did (e.g., adding a new paragraph) and when. At the end, I want to visualize the changes made by each user on a document per each day. I could not find a google drive api method. I found Drive Activity API, but not sure if this is what I am looking.
As a backup plan, I am thinking to include the google doc inside an iframe within my web application to store the key strokes. I appreciate any suggestions.

Answer 1

I believe what you are lookging for is revisions.list I am not sure how much of the information you are looking for is actually returned but it does return some information about the changes that where made.
{
"kind": "drive#revisionList",
"nextPageToken": string,
"revisions": [
revisions Resource
]
}
revision
{
"kind": "drive#revision",
"id": string,
"mimeType": string,
"modifiedTime": datetime,
"keepForever": boolean,
"published": boolean,
"publishAuto": boolean,
"publishedOutsideDomain": boolean,
"lastModifyingUser": {
"kind": "drive#user",
"displayName": string,
"photoLink": string,
"me": boolean,
"permissionId": string,
"emailAddress": string
},
"originalFilename": string,
"md5Checksum": string,
"size": long,
"exportLinks": {
(key): string
}
}