(PowerBuilder) List Files and Folders in a SharePoint Documents Library

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This example shows how to use Chilkat's HttpCurl class to list the files and folders in the root of a SharePoint Documents document library. In Microsoft Graph, a SharePoint document library is represented as a drive. The example demonstrates how HttpCurl automatically resolves the SharePoint site name to a site ID, finds the drive ID for the Documents library, and then retrieves the children of the library's root folder.

Note: This example requires Chilkat v11.0.0 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 li_NumFiles
integer i

li_Success = 0

// This example lists the files and folders in the root of the SharePoint
// Documents document library.
// 
// In Microsoft Graph terminology, a SharePoint document library is represented
// as a "drive".  The default document library is commonly named "Documents".
// This example shows how HttpCurl can automatically resolve the needed values:
// 
//   site_name  ->  site_id
//   site_id    ->  document_library_id
// 
// After those values are known, the final request lists the children of the
// root folder in the Documents document library.

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 curl commands using
// {{variable_name}} substitution syntax.
loo_Curl.SetVar("sharepoint_hostname","example.sharepoint.com")
loo_Curl.SetVar("site_name","test")

// The final request needs a Microsoft Graph site ID.
// 
// Because the application only knows the SharePoint site name,
// define a helper function that can retrieve the site record.
// HttpCurl can execute this function automatically when it needs
// to resolve the site_id variable.
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".
loo_Curl.AddOutput("getSite","id","site_id")

// The next value needed is the drive ID for the Documents document library.
// 
// This function lists the drives, also known as document libraries,
// belonging to the SharePoint site.
loo_Curl.AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives")

// Extract the ID of the drive whose name is "Documents".
// 
// AddOutput2 searches an array in the JSON response.  In this case:
// 
//   response array: value
//   match field:    name
//   match value:    Documents
//   case-sensitive: true
//   output field:   id
//   variable name:  document_library_id
// 
// The result is that document_library_id will contain the drive ID
// for the Documents document library.
loo_Curl.AddOutput2("getDrives","value","name","Documents",1,"id","document_library_id")

// The target Microsoft Graph request:
// 
// GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children
// 
// This lists the files and folders in the root folder of the Documents
// document library.
// 
// The {{site_id}} and {{document_library_id}} variables are not set directly
// by this program.  HttpCurl resolves them automatically by running the
// helper functions defined above.
ls_CurlCommand = "GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children"

// Execute the request.
// 
// HttpCurl examines the target request and determines that it requires
// both site_id and document_library_id.
// 
// The execution plan becomes:
// 
//   1) Execute getSite to obtain site_id.
//   2) Execute getDrives to obtain document_library_id.
//   3) Substitute both variables into the target request.
//   4) Execute the root/children request.
// 
// The final HTTP response returned by DoYourThing is always the response
// from the target request, 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, site lookup, or document library 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 represents one file or folder in the root of the
// Documents 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()
Write-Debug ""

// Count the number of items returned in the "value" array.
// 
// This includes both files and folders.
li_NumFiles = loo_Json.SizeOfArray("value")
Write-Debug "Number of files: " + string(li_NumFiles)
Write-Debug ""

// Iterate over the files and folders returned by Microsoft Graph
// and display selected properties for each item.
i = 0
do while i < li_NumFiles
    loo_Json.I = i

    Write-Debug "name: " + loo_Json.StringOf("value[i].name")
    Write-Debug "webUrl: " + loo_Json.StringOf("value[i].webUrl")
    Write-Debug "size: " + loo_Json.StringOf("value[i].size")
    Write-Debug "id: " + loo_Json.StringOf("value[i].id")
    Write-Debug "-"
    i = i + 1
loop


destroy loo_JsonAuth
destroy loo_Curl
destroy loo_Json