Thread overview
[SAoC] “D Language Client Libraries for Google APIs” project thread
Sep 09
ikod
Sep 30
aberba
September 09
Hi all,

I am Robert and during this year’s edition of SAoC I will be working on the “D Language Client Libraries for Google APIs” project. This thread will be used to post further updates.

Google APIs is a set of application programming interfaces (APIs) developed by Google which allow communication with Google Services and their integration to other services. Examples of these include GDrive, Calendar, Search or Gmail. Third-party apps can use these APIs to take advantage of or extend the functionality of the existing services.

At the moment, there is no client library for D Programming Language which can allow D developers to use various Google APIs. The goal of this project is to implement this library.

Milestones for this project:

Milestone 1 – Familiarize with dlang-requests, dub and OAuth 2.0
	- implement small app using dlang-requests that interacts with weather api
	- implement small app using dlang-requests that interacts with myip api
	- implement simple client-server app using dlang requests
	- use http requests to interact with google drive api and list its content
	- use dlang-requests to interact with google drive, list its content and store
	access token and refresh token

Milestone 2 – Familiarize with gapic-generator
	- read protobuf documentation
	- build protobuf example and understand how it works
	- read gapic-generator documentation and look at how the generator is used to
        build libraries for other languages

Milestone 3 – Add support Google Drive
	- write a proto file describing the API
	- write a yaml file describing certain service values
	- add support for Google Drive
	- test the generated library by inspecting and reading files, inspecting files 	
        details and creating file hierarchies

Milestone 4 – Validate general case
	- solve issues that may appear
	- creating calendar events to test the support for Google Calendar
	- filling sheets to test the support for Google Sheets
	- sending and reading emails to test support for Gmail

From now on, I will be posting updates weekly (or every two weeks) regarding the progress done on this project.

Thanks,
Robert


September 09
On Wednesday, 9 September 2020 at 18:35:22 UTC, Robert Aron wrote:
> Milestone 1 – Familiarize with dlang-requests, dub and OAuth 2.0


I've actually done much of this before so feel free to email if you ever need a pointer. I did it with my own http lib but it is easy enough to adapt.

refeshAccessToken()
        auto url = "https://www.googleapis.com/oauth2/v4/token";
        string[string] req = [
                "client_id" : config.web.client_id.get!string,
                "client_secret" : config.web.client_secret.get!string,
                "refresh_token" : auth.refresh_token.get!string,
                "grant_type" : "refresh_token"
        ];

        auto v = var.fromJson(cast(string) (post(url, req).waitForCompletion.content));


getCode()
        auto url = "https://accounts.google.com/o/oauth2/v2/auth";
        string[string] req = [
                "client_id" : config.web.client_id.get!string,
                "redirect_uri" : "http://localhost:9292/",
                "scope" : [
                        "https://www.googleapis.com/auth/drive",
                        "https://spreadsheets.google.com/feeds/",
                        "https://www.googleapis.com/auth/surveys",
                        "https://www.googleapis.com/auth/userinfo.email",
                ].join(" "),
                "access_type" : "offline",
                "response_type" : "code"
        ];


consumeCode()

        string[string] req = [
                "client_id" : config.web.client_id.get!string,
                "client_secret" : config.web.client_secret.get!string,
                "code" : code,
                "redirect_uri" : "http://localhost:9292/",
                "grant_type" : "authorization_code"
        ];

        auto creds_got = post(url, req);



update a google sheet

        var json = var.emptyObject;
        json.valueInputOption = "RAW"; // alternative is USER_ENTERED
        json.data = var.emptyArray;

        var obj = var.emptyObject;
        obj.range = "WHATEVERRRRR!B1:B4";
        obj.majorDimension = "COLUMNS"; // or could be ROWS to run left to right
        obj.values = [ ["1", "2", "3", "4"] ];

        json.data ~= obj;
        json.includeValuesInResponse = false;

        auto client = new HttpClient();
        auto request = client.request(arsd.http2.Uri("https://sheets.googleapis.com/v4/spreadsheets/SOMEID/values:batchUpdate"),
        HttpVerb.POST, cast(ubyte[]) json.toJson(), "application/json");
        request.requestParameters.headers ~= "Authorization: Bearer " ~ creds.access_token.get!string;




You get the idea, they aren't terribly complicated to do one piece at a time.
September 09
On Wednesday, 9 September 2020 at 18:35:22 UTC, Robert Aron wrote:
> Hi all,
>
> I am Robert and during this year’s edition of SAoC I will be working on the “D Language Client Libraries for Google APIs” project. This thread will be used to post further updates.

Nice project! Feel free to query for any missed features for dlang-requests in case you will base on it (although I think you should abstract http client from other code).
September 30
Update for week 2 of Milestone 1

Last week I managed to do the following tasks for #SAOC2020 :
- implemented a client-server app using dlang-requests
- created a google account for the project and credentials for the project in Google API Console
- get access and refresh tokens using curl and postman
- list content of the drive associated to the created account before and after adding some files

The plan for the next week is:
- familiarize myself with std.json and cerealed[0]
- start implementing an app that uses dlang-requests and is able to interact with google drive, list its content and store
serializede access and refresh tokens

Milestone 1 Update 1: [1]

[0]: https://code.dlang.org/packages/cerealed
[1]: https://forum.dlang.org/post/xitzuuhgxpfvnsdvdlyq@forum.dlang.org



September 30
On Wednesday, 30 September 2020 at 16:34:59 UTC, Robert Aron wrote:
> Update for week 2 of Milestone 1
>
> Last week I managed to do the following tasks for #SAOC2020 :
> - implemented a client-server app using dlang-requests
> - created a google account for the project and credentials for the project in Google API Console
> - get access and refresh tokens using curl and postman
> - list content of the drive associated to the created account before and after adding some files
>
> [...]


I'm very excited you're doing this. Keep up the good work. Very handy for my Web dev things.
October 09
Update for week 3 of Milestone 1

Last week I managed to do the following tasks for #SAOC2020 :
- familiarize myself with std.json and cerealed[0]
- implement authentication for the app that uses dlang-requests to list the content of the drive

The plan for the next week is:
- continue the implementation of the app
- solve any issues that may occur

Milestone 1 Update 1: [1]

[0]: https://code.dlang.org/packages/cerealed
[1]: https://forum.dlang.org/post/xitzuuhgxpfvnsdvdlyq@forum.dlang.org