Accessing Google SpreadSheet via JavaScript directly (no middle Server before Google Servers). -- 2

I would like to access the content of a GoogleSpreadSheet which I have its key and access to it, but will like not to learn the many tidbits of the APIs involved to do it, we need you to provide for the ready made function that just gets and writes the cell content from an user allowed (but non-public published) google Sheet. Your mission, if you accept, is to write a couple of JavaScript functions that call the API to perform such a functions. Adapt JavaScript Google API Sheet for reading and writing to a non public user Sheet for the following functions written by you for us to use: For reading a Cell: gSheetRead("fileKey", "SheetName", "Cell (ej 'A1') ) For writing a Cell: gSheetWrite("fileKey", "SheetName", "Cell (ej 'A1'), 'ContentToWrite') Needed: 1. Entirely 100% of code to be given written in JavaScript (not php, neither any other language) and a bit of HTML needed for logging of the user. 2. No external libraries used, with the exception of calling the Google needed scripts. 3. Just to put my GoogleKey in a variable once. 4. No use of GoogleScripting in the Sheet. The JavaScript code should run in any Sheet without any need of adaptation of the Sheet to be ready in any terms. If you really, really, really, need some GoogleScripting, include the code to include (without the need of calling to other external libraries beyond Google Apis), ready to paste into the SpreadSheet to work on. 5. Upon Google Logging, get and return the email of the current user. If you cannot comply with 1,2,3,4,5 it will not be useful for us, since the five items are required because of the limitations of the environment in which it will run (inside a smartphone webview). What Implies: - Include Google Logging with necessary permissions to modify and read google documents. - You really need to know JavaScript and by good at working with JavaScript APIs. - You understand what we are asking and can do it in very easily for you. - Really understand that if it will be coded once for all platforms of smartphone running in webview with JavaScript, no other for of code other that JavaScript (and HTML) can be used for accessing from the browser. - Before starting the project I would like you to assure me in the Chat that you understand the limitations, as to avoid wasting both your time and mine.