Proton API C# Client

Description

This library is a C# (netstandard 2.0) implementation of Proton API Client. It is meant for use by C# applications that want to authenticate at Proton server.

The official Python client can be found here.

Dependencies

• TuviAuthProtonLib
• TuviRestClientLib
• TuviSRPLib

Installation

• Add this repository as a submodule to your git repository;
• Update submodules recursively;
• Add the following projects to the solution:
  • proton-cs-client.csproj
  • TuviAuthProtonLib.csproj
  • TuviProtonPrimitiveLib.csproj
  • TuviRestClientLib.csproj
  • ProtonBase64Lib.scproj
  • TuviSRPLib.scproj
• Add the proton-cs-client.csproj project reference to your projects that will use Proton.

cd <repository folder path>

git submodule add https://github.com/Eppie-io/proton-cs-client.git submodules/proton-cs-client

git submodule update --init --recursive

# Unix/Linux shell

# globstar feature from Bash version 4 or higher.
# If set, the pattern ** used in a filename expansion context
shopt -s globstar 

dotnet sln <solution-file> add --solution-folder submodules **/proton-cs-client.csproj **/*Lib.csproj

dotnet add <project-file> reference **/proton-cs-client.csproj

# Windows PowerShell
dotnet sln <solution-file> add --solution-folder submodules (ls -r **/proton-cs-client.csproj) (ls -r **/*Lib.csproj)

dotnet add <project-file> reference (ls -r **/proton-cs-client.csproj)

Usage

Setup

Create new Proton session. For test run use these parameters:

using Tuvi.Proton.Client;

var proton = new Session(
    httpClient: new HttpClient(),
    host: new Uri("https://mail-api.proton.me"))
{
    AppVersion = "Other", 
    RedirectUri = new Uri("https://protonmail.ch")
};

Authentication

Authenticate by calling LoginAsync. Provide username and password.

Next, check if two-factor authentication is enabled. If so, provide TOTP code with ProvideTwoFactorCodeAsync.

await proton.LoginAsync(
    username: "<user@proton.me>",
    password: "<password>");

if (proton.IsTwoFactor && proton.IsTOTP)
{
    await proton.ProvideTwoFactorCodeAsync(code: "<123456>");
}

Logout

LogoutAsync closes the session.

await proton.LogoutAsync();

Refresh Session

RefreshAsync asynchronously refreshes AccessToken.

await proton.RefreshAsync();

Store session

If you want to store the session for, call Dump. The return value will contain JSON data, that can be passed later to Load and RefreshAsync.

string protonDump = proton.Dump();
Save(protonDump);

Sample result:

{
    "Version":1, 
    "Uid":"7ry2z7aydqhqir4a3xe7pcyqyqblkzmp",
    "AccessToken":"xvth2getrrhfuvvw5lfnkd7k3esfdbz7",
    "TokenType":"Bearer",
    "RefreshToken":"n4am4teh7htzbkhjyr2rg4fsut35ec46",
    "PasswordMode":1,
    "Scope":"full self payments keys parent user loggedin nondelinquent mail vpn calendar drive pass verified"
}

Load session

To Load previously saved session, provide a JSON formatted string created by Dump:

string protonDump = "<previously saved session state>";
proton.Load(dump: protonDump);

API Calls

After successful authentication you are ready to make API calls to Proton server. For more information on available requests refer to official Proton API repository.

RequestAsync makes a request asynchronously.

The following demo shows how to count the number of messages in the mailbox. This will return a value of type TotalMessagesContent that results from deserializing the content as JSON.

Example:

// The type represents the JSON response value
struct TotalMessagesContent
{
    public int Code { get; set; } 
    public string Error { get; set; } 
    public JsonObject Details { get; set; } 

    public IList<Folder> Counts { get; set; } 

    public record Folder
    {
        public string LabelID { get; set; } 
        public long Total { get; set; } 
        public long Unread { get; set; }
    }
}

// Api request
TotalMessagesContent countResponse = await proton.RequestAsync<TotalMessagesContent>(
    endpoint: new Uri("/mail/v4/messages/count", UriKind.Relative),
    method: HttpMethod.Get,
    headers: null);