feat: add Edge authentication support (#111)

Co-authored-by: Jakub Bednář <jakub.bednar@gmail.com>

Author: alespour

CHANGELOG.md

@@ -4,6 +4,18 @@
 
 1. [#101](https://github.com/InfluxCommunity/influxdb3-csharp/pull/101): Add standard `user-agent` header to all calls.
 1. [#110](https://github.com/InfluxCommunity/influxdb3-csharp/pull/110): InfluxDB Edge (OSS) error handling.
+1. [#111](https://github.com/InfluxCommunity/influxdb3-csharp/pull/111): Add InfluxDB Edge (OSS) authentication support.
+
+### Migration Notice
+
+- `InfluxDBClient` constructor with connection options has new option `authScheme` with `null` default value:
+
+```diff
+- public InfluxDBClient(string host, string token, string? organization = null, string? database = null);
++ public InfluxDBClient(string host, string token, string? organization = null, string? database = null, string? authScheme = null)
+```
+
+  This new option is used for Edge (OSS) authentication.
 
 ## 0.6.0 [2024-04-16]
 

Client.Test/Config/ClientConfigTest.cs

@@ -47,6 +47,21 @@ public void CreateFromConnectionStringBasic()
         });
     }
 
+    [Test]
+    public void CreateFromConnectionStringWithAuthScheme()
+    {
+        var cfg = new ClientConfig("http://localhost:8086?token=my-token&org=my-org&authScheme=my-scheme");
+        Assert.That(cfg, Is.Not.Null);
+        cfg.Validate();
+        Assert.Multiple(() =>
+        {
+            Assert.That(cfg.Host, Is.EqualTo("http://localhost:8086/"));
+            Assert.That(cfg.Token, Is.EqualTo("my-token"));
+            Assert.That(cfg.AuthScheme, Is.EqualTo("my-scheme"));
+            Assert.That(cfg.WriteOptions, Is.EqualTo(null));
+        });
+    }
+
     [Test]
     public void CreateFromConnectionStringWithWriteOptions()
     {
@@ -143,6 +158,28 @@ public void CreateFromEnvBasic()
         });
     }
 
+    [Test]
+    public void CreateFromEnvWithAuthScheme()
+    {
+        var env = new Dictionary<String, String>
+        {
+            {"INFLUX_HOST", "http://localhost:8086"},
+            {"INFLUX_TOKEN", "my-token"},
+            {"INFLUX_AUTH_SCHEME", "my-scheme"},
+        };
+        SetEnv(env);
+        var cfg = new ClientConfig(env);
+        Assert.That(cfg, Is.Not.Null);
+        cfg.Validate();
+        Assert.Multiple(() =>
+        {
+            Assert.That(cfg.Host, Is.EqualTo("http://localhost:8086/"));
+            Assert.That(cfg.Token, Is.EqualTo("my-token"));
+            Assert.That(cfg.AuthScheme, Is.EqualTo("my-scheme"));
+            Assert.That(cfg.WriteOptions, Is.EqualTo(null));
+        });
+    }
+
     [Test]
     public void CreateFromEnvWithWriteOptions()
     {

Client.Test/Internal/RestClientTest.cs

@@ -36,6 +36,22 @@ public async Task Authorization()
         Assert.That(requests[0].RequestMessage.Headers?["Authorization"][0], Is.EqualTo("Token my-token"));
     }
 
+    [Test]
+    public async Task AuthorizationCustomScheme()
+    {
+        CreateAndConfigureRestClient(new ClientConfig
+        {
+            Host = MockServerUrl,
+            Token = "my-token",
+            AuthScheme = "my-scheme"
+        });
+        await DoRequest();
+
+        var requests = MockServer.LogEntries.ToList();
+
+        Assert.That(requests[0].RequestMessage.Headers?["Authorization"][0], Is.EqualTo("my-scheme my-token"));
+    }
+
     [Test]
     public async Task UserAgent()
     {

Client/Config/ClientConfig.cs

@@ -13,6 +13,7 @@ namespace InfluxDB3.Client.Config;
 /// You can configure following options:
 /// - Host: The URL of the InfluxDB server.
 /// - Token: The authentication token for accessing the InfluxDB server.
+/// - AuthScheme: Token authentication scheme. Default is 'null' for Cloud access. Set to 'Bearer' for Edge access.
 /// - Organization: The organization to be used for operations.
 /// - Database: The database to be used for InfluxDB operations.
 /// - Headers: The set of HTTP headers to be included in requests.
@@ -44,6 +45,7 @@ public class ClientConfig
 {
     internal const string EnvInfluxHost = "INFLUX_HOST";
     internal const string EnvInfluxToken = "INFLUX_TOKEN";
+    internal const string EnvInfluxAuthScheme = "INFLUX_AUTH_SCHEME";
     internal const string EnvInfluxOrg = "INFLUX_ORG";
     internal const string EnvInfluxDatabase = "INFLUX_DATABASE";
     internal const string EnvInfluxPrecision = "INFLUX_PRECISION";
@@ -67,6 +69,7 @@ internal ClientConfig(string connectionString)
         Host = uri.GetLeftPart(UriPartial.Path);
         var values = HttpUtility.ParseQueryString(uri.Query);
         Token = values.Get("token");
+        AuthScheme = values.Get("authScheme");
         Organization = values.Get("org");
         Database = values.Get("database");
         ParsePrecision(values.Get("precision"));
@@ -80,6 +83,7 @@ internal ClientConfig(IDictionary env)
     {
         Host = (string)env[EnvInfluxHost];
         Token = env[EnvInfluxToken] as string;
+        AuthScheme = env[EnvInfluxAuthScheme] as string;
         Organization = env[EnvInfluxOrg] as string;
         Database = env[EnvInfluxDatabase] as string;
         ParsePrecision(env[EnvInfluxPrecision] as string);
@@ -100,6 +104,11 @@ public string Host
     /// </summary>
     public string? Token { get; set; }
 
+    /// <summary>
+    /// Token authentication scheme.
+    /// </summary>
+    public string? AuthScheme { get; set; }
+
     /// <summary>
     /// The organization to be used for operations.
     /// </summary>