Add initial code

Author: leadpony

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+indent_size = 2
+
+[{*.go,Makefile,go.*}]
+indent_style = tab

.gitattributes

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+* text=auto eol=lf
+*.bat text eol=crlf
+*.cmd text eol=crlf

.gitignore

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+.vscode/
+bin/
+.env

LICENSE

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+
+                                 Apache License
+                           Version 2.0, January 2004
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+
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+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
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+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+   Copyright 2025-2026 The slogan Authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

README.md

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+# slogan
+
+slogan is a [slog](https://pkg.go.dev/log/slog) Handler for submitting log records to [Azure Application Insights](https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-insights-overview).
+
+## Prerequisites
+
+This module requires [Go](https://go.dev) version [1.23](https://go.dev/doc/devel/release#go1.23.0) or higher.
+
+## Getting Started
+
+Install this module using the following command.
+
+```
+go get github.com/openclosed-dev/slogan
+```
+
+## Usage
+
+The code below shows how to use the handler in `appinsights` package.
+
+```go
+import (
+	"fmt"
+	"log/slog"
+	"os"
+
+	"github.com/openclosed-dev/slogan/appinsights"
+)
+
+func main() {
+
+	// The connection string provided by your Application Insights resource.
+	connectionString := os.Getenv("APPLICATIONINSIGHTS_CONNECTION_STRING")
+
+	// Creates a handler for Application Insights using the default options.
+	handler, err := appinsights.NewHandler(connectionString, nil)
+	if err != nil {
+		fmt.Print(err)
+		return
+	}
+	// The handler should be closed to flush log records before the application exits.
+	defer handler.Close()
+
+	// Creates a slog.Logger with the handler.
+	logger := slog.New(handler)
+	// Makes the logger as the system-wide default if you prefer.
+	slog.SetDefault(logger)
+
+	slog.Info("hello", "count", 3)
+}
+```

appinsights/connection_params.go

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+package appinsights
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+type connectionParams struct {
+	instrumentationKey string
+	ingestionEndpoint  *url.URL
+}
+
+func parseConnectionString(connectionString string) (*connectionParams, error) {
+
+	connectionString = strings.TrimSpace(connectionString)
+	if connectionString == "" {
+		return nil, errors.New("connection string is empty")
+	}
+
+	var instrumentationKey string
+	var ingestionEndpoint string
+
+	for _, v := range strings.Split(connectionString, ";") {
+		pair := strings.SplitN(v, "=", 2)
+		if len(pair) == 2 {
+			switch pair[0] {
+			case "InstrumentationKey":
+				instrumentationKey = pair[1]
+			case "IngestionEndpoint":
+				ingestionEndpoint = pair[1]
+			}
+		}
+	}
+
+	if instrumentationKey == "" {
+		return nil, errors.New("instrumentation key is missing")
+	}
+
+	if ingestionEndpoint == "" {
+		return nil, errors.New("ingestion endpoint is missing")
+	}
+
+	ingestionUrl, err := url.Parse(ingestionEndpoint)
+	if err != nil {
+		return nil, fmt.Errorf("ingestion endpoint is not a valid URL: %w", err)
+	}
+
+	return &connectionParams{
+		instrumentationKey: instrumentationKey,
+		ingestionEndpoint:  ingestionUrl,
+	}, nil
+}

appinsights/connection_params_test.go

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+package appinsights
+
+import "testing"
+
+func TestParseValidConnectionString(t *testing.T) {
+
+	connectionString := "InstrumentationKey=f81d4fae-7dec-11d0-a765-00a0c91e6bf6;IngestionEndpoint=https://southcentralus.in.applicationinsights.azure.com/"
+
+	spec, err := parseConnectionString(connectionString)
+	if err != nil {
+		t.Errorf("failed to parse valid connection string: %v", err)
+	}
+
+	if spec.instrumentationKey != "f81d4fae-7dec-11d0-a765-00a0c91e6bf6" {
+		t.Errorf("instrument key is wrong: %s", spec.instrumentationKey)
+	}
+
+	if spec.ingestionEndpoint == nil {
+		t.Errorf("ingestion endpoint is nil")
+	}
+
+	if spec.ingestionEndpoint.String() != "https://southcentralus.in.applicationinsights.azure.com/" {
+		t.Errorf("ingestion endpoint is wrong: %v", spec.ingestionEndpoint)
+	}
+}

appinsights/diagnostics.go

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+package appinsights
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/microsoft/ApplicationInsights-Go/appinsights"
+)
+
+// EnableDiagnostics enables telemetry printing for debugging purpose.
+func EnableDiagnostics() {
+	appinsights.NewDiagnosticsMessageListener(printDiagnosticsMessage)
+}
+
+func printDiagnosticsMessage(message string) error {
+	fmt.Printf("[%s] %s\n", time.Now().Format(time.RFC3339), message)
+	return nil
+}