jetherald/JetHerald/Authorization/PermissionParser.cs

namespace JetHerald.Authorization;
public static class PermissionParser
{
    public static bool ProvePermission(string permissions, string required)
        => permissions.Split(";").Any(p => MatchPermission(p, required));

    // TODO check, test and redo
    static bool MatchPermission(string match, string required)
    {
        string[] matchwords = match.Split('.');
        string[] reqwords = required.Split('.');

        if (reqwords.Length < matchwords.Length)
            return false;

        int matchindex = 0, reqindex = 0;

        while (matchindex < matchwords.Length)
        {
            if (matchwords[matchindex] == "**") reqindex = reqwords.Length - (matchwords.Length - matchindex);
            else if (matchwords[matchindex] != reqwords[reqindex] && matchwords[matchindex] != "*") return false;
            matchindex++;
            reqindex++;
        }

        return reqindex == reqwords.Length;
    }
}