Add OS and framework info to captured events

Author: haacked

src/PostHog/Api/PostHogApiClient.cs

@@ -1,13 +1,13 @@
 using System.Net.Http.Headers;
 using System.Net.Http.Json;
+using System.Runtime.InteropServices;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using PostHog.Config;
 using PostHog.Json;
 using PostHog.Library;
 using PostHog.Versioning;
 #if NETSTANDARD2_0 || NETSTANDARD2_1
-using PostHog.Library.Polyfills;
 #endif
 
 namespace PostHog.Api;
@@ -41,6 +41,10 @@ public PostHogApiClient(
         _timeProvider = timeProvider;
 
         _httpClient = httpClient;
+        var framework = RuntimeInformation.FrameworkDescription;
+        var os = RuntimeInformation.OSDescription;
+        var arch = RuntimeInformation.ProcessArchitecture;
+        _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd($"{LibraryName}/{VersionConstants.Version} ({framework}; {os}; {arch})");
 
         logger.LogTraceApiClientCreated(HostUrl);
     }
@@ -157,6 +161,9 @@ void PrepareAndMutatePayload(Dictionary<string, object> payload)
 
         properties["$lib"] = LibraryName;
         properties["$lib_version"] = VersionConstants.Version;
+        properties["$os"] = RuntimeInformation.OSDescription;
+        properties["$framework"] = RuntimeInformation.FrameworkDescription;
+        properties["$arch"] = RuntimeInformation.ProcessArchitecture.ToString();
         properties["$geoip_disable"] = true;
 
         properties.Merge(_options.Value.SuperProperties);

tests/UnitTests/PostHogClientTests.cs

@@ -1,4 +1,5 @@
 using System.Net.Http.Headers;
+using System.Runtime.InteropServices;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 using PostHog;
@@ -370,6 +371,9 @@ public async Task SendsCorrectPayload()
                          "properties": {
                            "$lib": "posthog-dotnet",
                            "$lib_version": "{{VersionConstants.Version}}",
+                           "$os": "{{RuntimeInformation.OSDescription}}",
+                           "$framework": "{{RuntimeInformation.FrameworkDescription}}",
+                           "$arch": "{{RuntimeInformation.ProcessArchitecture}}",
                            "$geoip_disable": true
                          },
                          "api_key": "fake-project-api-key",
@@ -411,6 +415,9 @@ public async Task SendsCorrectPayloadWithPersonProperties()
                            },
                            "$lib": "posthog-dotnet",
                            "$lib_version": "{{VersionConstants.Version}}",
+                           "$os": "{{RuntimeInformation.OSDescription}}",
+                           "$framework": "{{RuntimeInformation.FrameworkDescription}}",
+                           "$arch": "{{RuntimeInformation.ProcessArchitecture}}",
                            "$geoip_disable": true
                          },
                          "api_key": "fake-project-api-key",
@@ -445,6 +452,9 @@ public async Task SendsCorrectPayloadWithSuperProperties()
                          "properties": {
                            "$lib": "posthog-dotnet",
                            "$lib_version": "{{VersionConstants.Version}}",
+                           "$os": "{{RuntimeInformation.OSDescription}}",
+                           "$framework": "{{RuntimeInformation.FrameworkDescription}}",
+                           "$arch": "{{RuntimeInformation.ProcessArchitecture}}",
                            "$geoip_disable": true,
                            "source": "repo-name"
                          },
@@ -481,6 +491,9 @@ public async Task SendsCorrectPayload()
                            },
                            "$lib": "posthog-dotnet",
                            "$lib_version": "{{VersionConstants.Version}}",
+                           "$os": "{{RuntimeInformation.OSDescription}}",
+                           "$framework": "{{RuntimeInformation.FrameworkDescription}}",
+                           "$arch": "{{RuntimeInformation.ProcessArchitecture}}",
                            "$geoip_disable": true
                          },
                          "api_key": "fake-project-api-key",