# Azure Certificate Auth

This article is the sample showing Gosip custom auth with [AAD Certificate Authorization](https://docs.microsoft.com/en-us/azure/developer/go/azure-sdk-authorization).

### Azure App registration

1\. Create or use existing app registration

2\. Make sure that the app is configured for a specific auth scenario:

* Certificate

Follow instructions: <https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azuread>

* O365 Admin -> Azure Active Directory
* Generate self-signed certificate

```bash
# PowerShell, run on a Windows machine
$certName = "MyCert"
$password = "MyPassword"

$startDate = Get-Date
$endDate = (Get-Date).AddYears(5)
$securePass = (ConvertTo-SecureString -String $password -AsPlainText -Force)

.\Create-SelfSignedCertificate.ps1 -CommonName $certName -StartDate $startDate -EndDate $endDate -Password $securePass
```

or on a Linux or macOS client via `openssl`:

```bash
chmod +x ./Create-SelfSignedCertificate.sh
./Create-SelfSignedCertificate.sh
```

{% hint style="info" %}
Get [scripts](https://github.com/koltyakov/gosip/tree/master/auth/azurecert).
{% endhint %}

* New App Registration
  * Accounts in this organizational directory only
  * API Permissions -> SharePoint :: Application :: Sites.FullControl.All -> Grant Admin Consent
  * Certificates & Secrets -> Upload `.cer` file

### JSON

`private.json` sample:

```javascript
{
	"siteUrl": "https://contoso.sharepoint.com/sites/test",
	"tenantId": "e4d43069-8ecb-49c4-8178-5bec83c53e9d",
	"clientId": "628cc712-c9a4-48f0-a059-af64bdbb4be5",
	"certPath": "cert.pfx",
	"certPass": "password"
}
```

### Usage sample

```go
package main

import (
	"fmt"
	"log"
	"os"

	"github.com/koltyakov/gosip"
	"github.com/koltyakov/gosip/api"
	strategy "github.com/koltyakov/gosip/auth/azurecert"
)

func main() {

	// authCnfg := &strategy.AuthCnfg{
	// 	SiteURL:  os.Getenv("SPAUTH_SITEURL"),
	// 	TenantID: os.Getenv("AZURE_TENANT_ID"),
	// 	ClientID: os.Getenv("AZURE_CLIENT_ID"),
	// 	CertPath: os.Getenv("AZURE_CERTIFICATE_PATH"),
	// 	CertPass: os.Getenv("AZURE_CERTIFICATE_PASSWORD"),
	// }
	// or using `private.json` creds source

	authCnfg := &strategy.AuthCnfg{}
	configPath := "./config/private.json"
	if err := authCnfg.ReadConfig(configPath); err != nil {
		log.Fatalf("unable to get config: %v", err)
	}
	
	client := &gosip.SPClient{AuthCnfg: authCnfg}
	sp := api.NewSP(client)

	res, err := sp.Web().Select("Title").Get()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("Site title: %s\n", res.Data().Title)

}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://go.spflow.com/auth/strategies/azure-certificate-auth.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.