introduce a very simple Nextcloud API

Pilz.Networking.CloudProviders.Nextcloud/Model/NextcloudLogin.cs

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+using Newtonsoft.Json;
+using Pilz.Networking.CloudProviders.Nextcloud.OCS.Responses.LoginFlowV2;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Model
+{
+    public class NextcloudLogin
+    {
+        /// <summary>
+        /// The server url the login credentials are for.
+        /// </summary>
+        public string? Server { get; set; }
+
+        /// <summary>
+        /// The login name (username or password) used for the login.
+        /// </summary>
+        public string? LoginName { get; set; }
+
+        /// <summary>
+        /// The app password that has been generated.
+        /// </summary>
+        public string? AppPassword { get; set; }
+
+        public NextcloudLogin()
+        {
+        }
+
+        public NextcloudLogin(OcsResponseLoginFlowV2Credentials response)
+        {
+            Server = response.Server;
+            LoginName = response.LoginName;
+            AppPassword = response.AppPassword;
+        }
+    }
+}

Pilz.Networking.CloudProviders.Nextcloud/Model/UserBackendCapabilities.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Model
+{
+    public class UserBackendCapabilities
+    {
+        /// <summary>
+        /// Defines if the display name can be changed.
+        /// </summary>
+        public bool SetDisplayName { get; set; }
+
+        /// <summary>
+        /// Defines if the password can be changed.
+        /// </summary>
+        public bool SetPassword { get; set; }
+    }
+}

Pilz.Networking.CloudProviders.Nextcloud/Model/UserInfo.cs

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+using Pilz.Networking.CloudProviders.Nextcloud.OCS.Responses.Cloud;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Model
+{
+    public class UserInfo
+    {
+        /// <summary>
+        /// Defines if the user is enabled.
+        /// </summary>
+        public bool Enabled { get; set; }
+
+        /// <summary>
+        /// The location of the user's storage directory.
+        /// </summary>
+        public string? StorageLocation { get; set; }
+
+        /// <summary>
+        /// The uniquie user id that infos are for.
+        /// </summary>
+        public string? ID { get; set; }
+
+        /// <summary>
+        /// The last time when the user has logged in to its account.
+        /// </summary>
+        public DateTime LastLogin { get; set; }
+
+        /// <summary>
+        /// The backend of the user. Common values are "Database" or "LDAP".
+        /// </summary>
+        public string? Backend { get; set; }
+
+        /// <summary>
+        /// The Email address of the user.
+        /// </summary>
+        public string? Email { get; set; }
+
+        /// <summary>
+        /// The displayname of the user.
+        /// </summary>
+        public string? Displayname { get; set; }
+
+        /// <summary>
+        /// The displayname of the user.
+        /// </summary>
+        public string? Displayname2 { get; set; }
+
+        /// <summary>
+        /// The phone number of the user.
+        /// </summary>
+        public string? Phone { get; set; }
+
+        /// <summary>
+        /// The address of the user.
+        /// </summary>
+        public string? Address { get; set; }
+
+        /// <summary>
+        /// The Website of the user.
+        /// </summary>
+        public string? Website { get; set; }
+
+        /// <summary>
+        /// The twitter profile name of the user.
+        /// </summary>
+        public string? Twitter { get; set; }
+
+        /// <summary>
+        /// Defines the groups the user is member of.
+        /// </summary>
+        public string[] Groups { get; set; }
+
+        /// <summary>
+        /// The configured language of the user.
+        /// </summary>
+        public string? Language { get; set; }
+
+        /// <summary>
+        /// The configured location of the user.
+        /// </summary>
+        public string? Locale { get; set; }
+
+        /// <summary>
+        /// Quota informations for the user.
+        /// </summary>
+        public UserQuota Quota { get; } = new();
+
+        /// <summary>
+        /// Backend capabilities of the user.
+        /// </summary>
+        public UserBackendCapabilities BackendCapabilities { get; } = new();
+
+        public UserInfo(OcsResponseDataUser responseData)
+        {
+            Enabled = Convert.ToBoolean(responseData.Enabled);
+            StorageLocation = responseData.StorageLocation;
+            ID = responseData.ID;
+            LastLogin = Convert.ToDateTime(responseData.LastLogin);
+            Backend = responseData.Backend;
+            Email = responseData.Email;
+            Displayname = responseData.Displayname;
+            Displayname2 = responseData.Displayname2;
+            Phone = responseData.Phone;
+            Address = responseData.Address;
+            Website = responseData.Website;
+            Twitter = responseData.Twitter;
+            Groups = responseData.Groups ?? Array.Empty<string>();
+            Language = responseData.Language;
+            Locale = responseData.Locale;
+
+            if (responseData.Quota != null)
+            {
+                Quota.Free = responseData.Quota.Free ?? 0;
+                Quota.Used = responseData.Quota.Used ?? 0;
+                Quota.Total = responseData.Quota.Total ?? 0;
+                Quota.Relative = responseData.Quota.Relative ?? 0.0F;
+                Quota.Quota = responseData.Quota.Quota ?? 0;
+            }
+
+            if (responseData.BackendCapabilities != null)
+            {
+                BackendCapabilities.SetDisplayName = Convert.ToBoolean(responseData.BackendCapabilities.SetDisplayName);
+                BackendCapabilities.SetPassword = Convert.ToBoolean(responseData.BackendCapabilities.SetPassword);
+            }
+        }
+    }
+}

Pilz.Networking.CloudProviders.Nextcloud/Model/UserQuota.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Model
+{
+    public class UserQuota
+    {
+        /// <summary>
+        /// Amount of free bytes left.
+        /// </summary>
+        public ulong Free { get; set; }
+
+        /// <summary>
+        /// Amount of already used bytes.
+        /// </summary>
+        public ulong Used { get; set; }
+
+        /// <summary>
+        /// Total amount of all bytes (free + used).
+        /// </summary>
+        public ulong Total { get; set; }
+
+        /// <summary>
+        /// Relative amount of used quota in percent.
+        /// </summary>
+        public float Relative { get; set; }
+
+        /// <summary>
+        /// Total amount of bytes available.
+        /// </summary>
+        public ulong Quota { get; set; }
+    }
+}