Update

.github/workflows/dotnet.yml

@@ -20,6 +20,8 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 8.0.x
+    - name: Install .NET Aspire workload
+      run: dotnet workload install aspire
     - name: Restore dependencies
       run: dotnet restore ./src/wan24-AutoDiscover.sln --ignore-failed-sources
     - name: Build lib

README.md

@@ -5,7 +5,12 @@ Exchange POX autodiscover standard, which allows email clients to receive
 automatic configuration information for an email account.
 
 It was created using .NET 8 and ASP.NET. You find a published release build 
-for each published release on GitHub as ZIP download for self-hosting.
+for each published release on GitHub as ZIP file download for self-hosting.
+
+The webservice is designed for working with dynamic MTA configurations and 
+tries to concentrate on the basics for fast request handling and response. All 
+required informations will be held in memory, so no database or filesystem 
+access is required for request handling.
 
 ## Usage
 
@@ -20,9 +25,9 @@ For example on a Debian Linux server:
 ```bash
 mkdir /home/autodiscover
 cd /home/autodiscover
-wget https://github.com/nd1012/wan24-AutoDiscover/releases/download/v1.0.0/wan24-AutoDiscover.v1.0.0.zip
-unzip wan24-AutoDiscover.v1.0.0.zip
-rm wan24-AutoDiscover.v1.0.0.zip
+wget https://github.com/nd1012/wan24-AutoDiscover/releases/download/v1.1.0/wan24-AutoDiscover.v1.1.0.zip
+unzip wan24-AutoDiscover.v1.1.0.zip
+rm wan24-AutoDiscover.v1.1.0.zip
 ```
 
 ### `appsettings.json`
@@ -103,7 +108,7 @@ For serving a request, the `DomainConfig` will be looked up
 
 Any unmatched `DomainConfig` will cause a `Bad request` http response.
 
-Documentation references:
+Find the online documentation of the used types here:
 
 - [`DiscoveryConfig`](https://nd1012.github.io/wan24-AutoDiscover/api/wan24.AutoDiscover.Models.DiscoveryConfig.html)
 - [`DomainConfig`](https://nd1012.github.io/wan24-AutoDiscover/api/wan24.AutoDiscover.Models.DomainConfig.html)
@@ -217,3 +222,147 @@ things for you:
 ```bash
 dotnet wan24AutoDiscover.dll autodiscover systemd > /etc/systemd/system/autodiscover.service
 ```
+
+#### Parse a Postfix virtual configuration file
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover postfix < /etc/postfix/virtual > /home/autodiscover/postfix.json
+```
+
+#### Display version number
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover version
+```
+
+#### Upgrade online
+
+Check for an available newer version only:
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover upgrade -checkOnly
+```
+
+**NOTE**: The command will exit with code #2, if an update is available online.
+
+Upgrade with user interaction:
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover upgrade
+```
+
+Upgrade without user interaction:
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover upgrade -noUserInteraction
+```
+
+#### Display detailed CLI API usage instructions
+
+```bash
+dotnet wan24AutoDiscover.dll help -details
+```
+
+## Login name mapping
+
+If the login name isn't the email address or the alias of the given email 
+address, you can create a login name mapping per domain and/or protocol, by 
+defining a mapping from the email address or alias to the login name. During 
+lookup the protocol mapping and then the domain mapping will be used by trying 
+the email address and then the alias as key.
+
+### Automatic email address to login user mapping with Postfix
+
+If your Postfix virtual email mappings are stored in a hash text file, you can 
+create an email mapping from is using
+
+```bash
+dotnet wan24AutoDiscover.dll autodiscover postfix < /etc/postfix/virtual > /home/autodiscover/postfix.json
+```
+
+Then you can add the `postix.json` to your `appsettings.json`:
+
+```json
+{
+	...
+  "DiscoveryConfig": {
+	...
+	"EmailMappings": "/home/autodiscover/postfix.json",
+	...
+  }
+}
+```
+
+The configuration will be reloaded, if the `postfix.json` file changed, so be 
+sure to re-create the `postfix.json` file as soon as the `virtual` file was 
+changed. If you don't want that, set `WatchEmailMappings` to `false`.
+
+### Additionally watched files
+
+You can set a list of additionally watched file paths to `WatchFiles` in your 
+`appsettings.json` file. When any file was changed, the configuration will be 
+reloaded.
+
+### Pre-reload command execution
+
+To execute a command before reloading a changed configration, set the 
+`PreReloadCommand` value in your `appsettings.json` like this:
+
+```json
+{
+	...
+  "DiscoveryConfig": {
+	...
+	"PreReloadCommand": ["/command/to/execute", "argument1", "argument2", ...],
+	...
+  }
+}
+```
+
+## Automatic online upgrades
+
+You can upgrade `wan24-AutoDiscover` online and automatic. For this some steps 
+are recommended:
+
+1. Create sheduled task for auto-upgrade (daily, for example)
+1. Stop the service before installing the newer version
+1. Start the service after installing the newer version
+
+The sheduled auto-upgrade task should execute this command on a Debian Linux 
+server, for example:
+
+```bash
+dotnet /home/autodiscover/wan24AutoDiscover.dll autodiscover upgrade -noUserInteraction --preCommand systemctl stop autodiscover --postCommand systemctl start autodiscover
+```
+
+If the upgrade download failed, nothing will happen - the upgrade won't be 
+installed only and being re-tried at the next sheduled auto-upgrade time.
+
+If the upgrade installation failed, the post-upgrade command won't be 
+executed, and the autodiscover service won't run. This'll give you the chance 
+to investigate the broken upgrade and optional restore the running version 
+manually.
+
+**CAUTION**: The auto-upgrade is being performed using the GitHub repository. 
+There are no security checks at present - so if the repository was hacked, you 
+could end up with upgrading to a compromised software which could harm your 
+system!
+
+The upgrade setup should be done in less than a second, if everything was fine.
+
+## Manual upgrade
+
+1. Download the latest release ZIP file from GitHub
+1. Extract the ZIP file to a temporary folder
+1. Stop the autodiscover service, if running
+1. Create a backup of your current installation
+1. Copy all extracted files/folders excluding `appsettings.json` to your 
+installation folder
+1. Remove files/folders that are no longer required and perform additional 
+upgrade steps, which are required for the new release (see upgrade 
+instructions)
+1. Start the autodiscover service
+1. Delete the previously created backup and the temporary folder
+
+These steps are being executed during an automatic upgrade like described 
+above also.

latest-release.txt

@@ -0,0 +1 @@
+1.1.0

src/wan24-AutoDiscover Shared/Constants.cs

@@ -5,9 +5,41 @@
     /// </summary>
     public static class Constants
     {
+        /// <summary>
+        /// Auto discovery XML namespace
+        /// </summary>
+        public const string AUTO_DISCOVER_NS = "http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006";
         /// <summary>
         /// POX response node XML namespace
         /// </summary>
         public const string RESPONSE_NS = "https://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a";
+        /// <summary>
+        /// <c>Autodiscover</c> node name
+        /// </summary>
+        public const string AUTODISCOVER_NODE_NAME = "Autodiscover";
+        /// <summary>
+        /// <c>Response</c> node name
+        /// </summary>
+        public const string RESPONSE_NODE_NAME = "Response";
+        /// <summary>
+        /// <c>Account</c> node name
+        /// </summary>
+        public const string ACCOUNT_NODE_NAME = "Account";
+        /// <summary>
+        /// <c>AccountType</c> node name
+        /// </summary>
+        public const string ACCOUNTTYPE_NODE_NAME = "AccountType";
+        /// <summary>
+        /// Account type
+        /// </summary>
+        public const string ACCOUNTTYPE = "email";
+        /// <summary>
+        /// <c>Action</c> node name
+        /// </summary>
+        public const string ACTION_NODE_NAME = "Action";
+        /// <summary>
+        /// Action
+        /// </summary>
+        public const string ACTION = "settings";
     }
 }

src/wan24-AutoDiscover Shared/Models/DiscoveryConfig.cs

@@ -3,6 +3,7 @@
 using System.Collections.Frozen;
 using System.ComponentModel.DataAnnotations;
 using System.Net;
+using System.Net.Mail;
 using System.Text.Json.Serialization;
 using wan24.Core;
 using wan24.ObjectValidation;
@@ -12,12 +13,22 @@ namespace wan24.AutoDiscover.Models
     /// <summary>
     /// Discovery configuration
     /// </summary>
-    public record class DiscoveryConfig
+    public record class DiscoveryConfig : ValidatableRecordBase
     {
+        /// <summary>
+        /// Discovery configuration type
+        /// </summary>
+        protected Type? _DiscoveryType = null;
+
         /// <summary>
         /// Constructor
         /// </summary>
-        public DiscoveryConfig() { }
+        public DiscoveryConfig() : base() { }
+
+        /// <summary>
+        /// Current configuration
+        /// </summary>
+        public static DiscoveryConfig Current { get; set; } = null!;
 
         /// <summary>
         /// Logfile path
@@ -41,22 +52,46 @@ public DiscoveryConfig() { }
         /// Discovery configuration type
         /// </summary>
         [JsonIgnore]
-        public Type DiscoveryType => DiscoveryTypeName is null
+        public virtual Type DiscoveryType => _DiscoveryType ??= string.IsNullOrWhiteSpace(DiscoveryTypeName)
             ? typeof(Dictionary<string, DomainConfig>)
             : TypeHelper.Instance.GetType(DiscoveryTypeName)
                 ?? throw new InvalidDataException($"Discovery type {DiscoveryTypeName.ToQuotedLiteral()} not found");
 
         /// <summary>
         /// Known http proxies
         /// </summary>
-        public HashSet<IPAddress> KnownProxies { get; init; } = [];
+        public IReadOnlySet<IPAddress> KnownProxies { get; init; } = new HashSet<IPAddress>();
+
+        /// <summary>
+        /// JSON file path which contains the email mappings list
+        /// </summary>
+        [StringLength(short.MaxValue, MinimumLength = 1)]
+        public string? EmailMappings { get; init; }
+
+        /// <summary>
+        /// Watch email mappings list file changes for reloading the configuration?
+        /// </summary>
+        public bool WatchEmailMappings { get; init; } = true;
+
+        /// <summary>
+        /// Additional file paths to watch for an automatic configuration reload
+        /// </summary>
+        [CountLimit(1, byte.MaxValue), ItemStringLength(short.MaxValue)]
+        public string[]? WatchFiles { get; init; }
+
+        /// <summary>
+        /// Command to execute (and optional arguments) before reloading the configuration
+        /// </summary>
+        [CountLimit(1, byte.MaxValue), ItemStringLength(short.MaxValue)]
+        public string[]? PreReloadCommand { get; init; }
 
         /// <summary>
         /// Get the discovery configuration
         /// </summary>
         /// <param name="config">Configuration</param>
+        /// <param name="cancellationToken">Cancellation token</param>
         /// <returns>Discovery configuration</returns>
-        public FrozenDictionary<string, DomainConfig> GetDiscoveryConfig(IConfigurationRoot config)
+        public virtual async Task<IReadOnlyDictionary<string, DomainConfig>> GetDiscoveryConfigAsync(IConfigurationRoot config, CancellationToken cancellationToken = default)
         {
             Type discoveryType = DiscoveryType;
             if (!typeof(IDictionary).IsAssignableFrom(discoveryType))
@@ -68,19 +103,64 @@ public FrozenDictionary<string, DomainConfig> GetDiscoveryConfig(IConfigurationR
             if (gt.Length != 2)
                 throw new InvalidDataException($"Discovery type must be a generic type with two type arguments");
             if (gt[0] != typeof(string))
-                throw new InvalidDataException($"Discovery types first generic type argument must be a {typeof(string)}");
+                throw new InvalidDataException($"Discovery types first generic type argument must be {typeof(string)}");
             if (!typeof(DomainConfig).IsAssignableFrom(gt[1]))
                 throw new InvalidDataException($"Discovery types second generic type argument must be a {typeof(DomainConfig)}");
             // Parse the discovery configuration
             IDictionary discovery = config.GetRequiredSection("DiscoveryConfig:Discovery").Get(discoveryType) as IDictionary
-                ?? throw new InvalidDataException("Failed to get discovery configuration");
+                ?? throw new InvalidDataException("Failed to get discovery configuration from the \"DiscoveryConfig:Discovery section\"");
             object[] keys = new object[discovery.Count],
                 values = new object[discovery.Count];
             discovery.Keys.CopyTo(keys, index: 0);
             discovery.Values.CopyTo(values, index: 0);
-            return new Dictionary<string, DomainConfig>(
+            Dictionary<string, DomainConfig> discoveryDomains = new(
                 Enumerable.Range(0, discovery.Count).Select(i => new KeyValuePair<string, DomainConfig>((string)keys[i], (DomainConfig)values[i]))
-                ).ToFrozenDictionary();
+                );
+            // Apply email mappings
+            if (!string.IsNullOrWhiteSpace(EmailMappings))
+                if (File.Exists(EmailMappings))
+                {
+                    Logging.WriteInfo($"Loading email mappings from {EmailMappings.ToQuotedLiteral()}");
+                    FileStream fs = FsHelper.CreateFileStream(EmailMappings, FileMode.Open, FileAccess.Read, FileShare.Read);
+                    EmailMapping[] mappings;
+                    await using (fs.DynamicContext())
+                        mappings = await JsonHelper.DecodeAsync<EmailMapping[]>(fs, cancellationToken).DynamicContext()
+                            ?? throw new InvalidDataException("Invalid email mappings");
+                    foreach(EmailMapping mapping in mappings)
+                    {
+                        if (!mapping.Email.Contains('@'))
+                        {
+                            if (Logging.Debug)
+                                Logging.WriteDebug($"Skipping invalid email address {mapping.Email.ToQuotedLiteral()}");
+                            continue;
+                        }
+                        string email = mapping.Email.ToLower();
+                        string[] emailParts = email.Split('@', 2);
+                        if (
+                            emailParts.Length != 2 ||
+                            !MailAddress.TryCreate(email, out MailAddress? emailAddress) ||
+                            (emailAddress.User.Length == 1 && (emailAddress.User[0] == '*' || emailAddress.User[0] == '@')) ||
+                            EmailMapping.GetLoginUser(mappings, email) is not string loginUser ||
+                            DomainConfig.GetConfig(string.Empty, emailParts) is not DomainConfig domain
+                            )
+                        {
+                            if (Logging.Debug)
+                                Logging.WriteDebug($"Mapping email address {email.ToQuotedLiteral()} to login user failed, because it seems to be a redirection to an external target, or no matching domain configuration was found");
+                            continue;
+                        }
+                        if (Logging.Debug)
+                            Logging.WriteDebug($"Mapping email address {email.ToQuotedLiteral()} to login user {loginUser.ToQuotedLiteral()}");
+                        domain.LoginNameMapping ??= [];
+                        if (Logging.Debug && domain.LoginNameMapping.ContainsKey(email))
+                            Logging.WriteDebug($"Overwriting existing email address {email.ToQuotedLiteral()} mapping");
+                        domain.LoginNameMapping[email] = loginUser;
+                    }
+                }
+                else
+                {
+                    Logging.WriteWarning($"Email mappings file {EmailMappings.ToQuotedLiteral()} not found");
+                }
+            return discoveryDomains.ToFrozenDictionary();
         }
     }
 }