Get GitHub API from Windows Credential Store

Get_GitHub_APIToken.ps1

Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;
using System.Text;

public class CredentialManager {
    [DllImport("advapi32", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern bool CredRead(string target, int type, int reservedFlag, out IntPtr credentialPtr);

    [DllImport("advapi32", SetLastError = true)]
    public static extern void CredFree(IntPtr cred);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct CREDENTIAL {
        public int Flags;
        public int Type;
        public IntPtr TargetName;
        public IntPtr Comment;
        public long LastWritten;
        public int CredentialBlobSize;
        public IntPtr CredentialBlob;
        public int Persist;
        public int AttributeCount;
        public IntPtr Attributes;
        public IntPtr TargetAlias;
        public IntPtr UserName;
    }

    public static string GetCredential(string targetName) {
        IntPtr credPtr;
        if (CredRead(targetName, 1, 0, out credPtr)) {
            var credential = (CREDENTIAL)Marshal.PtrToStructure(credPtr, typeof(CREDENTIAL));
            string password = Marshal.PtrToStringUni(credential.CredentialBlob, credential.CredentialBlobSize / 2);
            CredFree(credPtr);
            return password;
        } else {
            throw new Exception("Failed to retrieve credential from Windows Credential Manager.");
        }
    }
}
"@

 function Get-GitHubToken {
     param (
         [string]$targetName = "git:https://github.com"
     )

     try {
         $token = [CredentialManager]::GetCredential($targetName)
         return $token
     } catch {
         Write-Error $_.Exception.Message
         return $null
     }
 }

# Get the GitHub API token
$githubToken = Get-GitHubToken

# Check if the token was retrieved successfully
if ($githubToken) {
    # Make a GitHub API request
    $headers = @{
        Authorization = "token $githubToken"
    }
    $url = "https://api.github.com/user"

    # Perform the API request
    $response = Invoke-RestMethod -Uri $url -Headers $headers -Method Get

    # Output the response
    $response
} else {
    Write-Error "Failed to retrieve GitHub API token."
}