(PowerBuilder) SharePoint List Document Libraries

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This example shows how to use Chilkat's HttpCurl class to list the document libraries in a SharePoint site. In Microsoft Graph, SharePoint document libraries are represented as drives. The example demonstrates how HttpCurl can automatically resolve a SharePoint site name to its Microsoft Graph site ID, then use that ID to retrieve and display the site's document libraries.

Note: This example requires Chilkat v11.5.0 or greater.

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integer li_rc
integer li_Success
oleobject loo_JsonAuth
oleobject loo_Curl
string ls_CurlCommand
integer li_StatusCode
oleobject loo_Json
integer i
integer li_NumDrives

li_Success = 0

// This example retrieves the document libraries for a SharePoint site.
// 
// In Microsoft Graph terminology, a document library is represented as a "drive".
// The example demonstrates how HttpCurl can automatically resolve a SharePoint
// site name to a site ID before requesting the site's document libraries.

li_Success = 0

// --------------------------------------------------------------------------------------------------------
// Before running this example, create an Azure App Registration and grant it
// the Microsoft Graph permissions required to access SharePoint.
// 
// The application will authenticate using OAuth2 Client Credentials.
// See:
// How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
// --------------------------------------------------------------------------------------------------------

// Build a JSON authentication configuration.
// HttpCurl will use this information to automatically obtain OAuth2 access tokens.
loo_JsonAuth = create oleobject
li_rc = loo_JsonAuth.ConnectToNewObject("Chilkat.JsonObject")
if li_rc < 0 then
    destroy loo_JsonAuth
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Enable secret lookup.
// 
// Instead of hard-coding sensitive values such as the client ID,
// client secret, and token endpoint, secret specification strings
// are used.  Chilkat automatically retrieves the actual values from
// Windows Credential Manager (Windows) or Apple Keychain (macOS).
// 
// See:
// Secret Specification Strings
loo_JsonAuth.EnableSecrets = 1

li_Success = loo_JsonAuth.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
if li_Success = 1 then
    li_Success = loo_JsonAuth.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
end if

if li_Success = 1 then
    li_Success = loo_JsonAuth.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
end if

if li_Success = 0 then
    Write-Debug loo_JsonAuth.LastErrorText
    destroy loo_JsonAuth
    return
end if

// Request Microsoft Graph permissions that were granted to the application.
loo_JsonAuth.UpdateString("oauth2.scope","https://graph.microsoft.com/.default")

// ---------------------------------------------------------------------------------------------------

loo_Curl = create oleobject
li_rc = loo_Curl.ConnectToNewObject("Chilkat.HttpCurl")

// Associate the OAuth2 configuration with HttpCurl.
// 
// When the request is executed, Chilkat automatically obtains an access token
// if needed and adds the Authorization: Bearer header to the HTTP request.
loo_Curl.SetAuth(loo_JsonAuth)

// Define variables whose values are already known.
// 
// These variables are referenced in the curl command using
// {{variable_name}} substitution syntax.
loo_Curl.SetVar("sharepoint_hostname","example.sharepoint.com")
loo_Curl.SetVar("site_name","test")

// The document libraries endpoint requires a Microsoft Graph site ID.
// 
// Because the application only knows the SharePoint site name,
// HttpCurl must first retrieve the corresponding site ID.
// 
// Define a function that can resolve the site_id variable when needed.
// HttpCurl may execute this function automatically if it determines that
// site_id is required by another request.
loo_Curl.AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}")

// Extract the "id" field from the getSite response and store it
// in the HttpCurl variable named "site_id".
// 
// Any later request that references {{site_id}} can use this value.
loo_Curl.AddOutput("getSite","id","site_id")

// The target Microsoft Graph request:
// 
// curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives
// 
// This request returns the document libraries belonging to the site.
// 
// Microsoft Graph refers to document libraries as "drives",
// so each object in the response represents one document library.
// 
// No Authorization header is included because HttpCurl automatically
// adds it when OAuth2 authentication is configured.
ls_CurlCommand = "curl -X GET ~"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives~""

// Execute the request.
// 
// HttpCurl examines the target curl command and determines that
// the variable {{site_id}} is required.
// 
// Because site_id is not yet known, HttpCurl searches for a function
// capable of producing it.  The getSite function provides the "id"
// output, which is mapped to the site_id variable.
// 
// The execution plan becomes:
// 
//   1) Execute getSite to obtain site_id.
//   2) Substitute {{site_id}} into the target request.
//   3) Execute the drives request.
// 
// The final HTTP response returned by DoYourThing is always the
// response from the target curl command, which is the last step in the plan.
li_Success = loo_Curl.DoYourThing(ls_CurlCommand)
if li_Success = 0 then
    Write-Debug loo_Curl.LastErrorText
    destroy loo_JsonAuth
    destroy loo_Curl
    return
end if

// A successful Graph response should return HTTP 200.
// Any other status code typically indicates an authentication,
// permission, or resource lookup error.
li_StatusCode = loo_Curl.StatusCode
if li_StatusCode <> 200 then
    Write-Debug loo_Curl.ResponseBodyStr
    Write-Debug "status code = " + string(li_StatusCode)
    destroy loo_JsonAuth
    destroy loo_Curl
    return
end if

// The response body contains a JSON array named "value".
// Each element of the array describes a SharePoint document library.
loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

loo_Json.EmitCompact = 0
loo_Curl.GetResponseJson(loo_Json)
Write-Debug loo_Json.Emit()

// Iterate over the document libraries returned by Microsoft Graph
// and display selected properties for each library.
i = 0
li_NumDrives = loo_Json.SizeOfArray("value")
do while i < li_NumDrives
    loo_Json.I = i
    Write-Debug "name: " + loo_Json.StringOf("value[i].name")
    Write-Debug "description: " + loo_Json.StringOf("value[i].description")
    Write-Debug "id: " + loo_Json.StringOf("value[i].id")
    Write-Debug "webUrl: " + loo_Json.StringOf("value[i].webUrl")
    Write-Debug "displayName: " + loo_Json.StringOf("value[i].createdBy.user.displayName")
    Write-Debug "-"
    i = i + 1
loop

Write-Debug "Success."


destroy loo_JsonAuth
destroy loo_Curl
destroy loo_Json