(AutoIt) Download a File from a SharePoint Documents Library

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This example shows how to use Chilkat's HttpCurl class to download a file from the root of a SharePoint Documents document library. The example demonstrates how HttpCurl automatically resolves the SharePoint site name to a site ID, finds the drive ID for the Documents library, locates the file by name, and then downloads the file content using Microsoft Graph.

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Local $bSuccess = False

; This example downloads a file named "hamlet.json" from the root of the SharePoint
; Documents document library.
; 
; The example demonstrates how HttpCurl can automatically resolve all of the
; information needed to locate and download a file:
; 
;   site_name            -> site_id
;   site_id              -> document_library_id
;   document_library_id  -> file_id
;   file_id              -> file content
; 
; The application only provides the SharePoint site name and the desired
; filename.  HttpCurl automatically executes the required Microsoft Graph
; requests to obtain the remaining values.

$bSuccess = False

; --------------------------------------------------------------------------------------------------------
; 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.
$oJsonAuth = ObjCreate("Chilkat.JsonObject")

; 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
$oJsonAuth.EnableSecrets = True

$bSuccess = $oJsonAuth.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
If ($bSuccess = True) Then
    $bSuccess = $oJsonAuth.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
EndIf

If ($bSuccess = True) Then
    $bSuccess = $oJsonAuth.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
EndIf

If ($bSuccess = False) Then
    ConsoleWrite($oJsonAuth.LastErrorText & @CRLF)
    Exit
EndIf

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

; ---------------------------------------------------------------------------------------------------

$oCurl = ObjCreate("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.
$oCurl.SetAuth($oJsonAuth)

; Define values that are already known.
; 
; These variables are referenced in curl commands using
; {{variable_name}} substitution syntax.
$oCurl.SetVar "sharepoint_hostname","example.sharepoint.com"
$oCurl.SetVar "site_name","test"

; The first step is to obtain the Microsoft Graph site ID.
; 
; The application only knows the SharePoint site name, so define
; a function that can retrieve the site information.
$oCurl.AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}")

; Extract the site's ID and store it in the HttpCurl variable named site_id.
$oCurl.AddOutput("getSite","id","site_id")

; The next step is to find the Documents document library.
; 
; Microsoft Graph refers to document libraries as "drives".
$oCurl.AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives")

; Search the returned drives for the one named "Documents"
; and save its drive ID in the document_library_id variable.
$oCurl.AddOutput2("getDrives","value","name","Documents",True,"id","document_library_id")

; Now list the contents of the Documents document library.
$oCurl.AddFunction("getFiles","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children")

; Search the returned files for an item named "hamlet.json"
; and save its Microsoft Graph item ID in the file_id variable.
$oCurl.AddOutput2("getFiles","value","name","hamlet.json",True,"id","file_id")

; This is the target request.
; 
; GET -L https://graph.microsoft.com/v1.0/drives/{{document_library_id}}/items/{{file_id}}/content
; 
; The /content endpoint returns the actual contents of the file.
; 
; The -L option instructs HttpCurl to follow the redirect returned by
; Microsoft Graph.  The Graph API typically responds with a redirect
; to the actual file download URL.
Local $sCurlCommand = "GET -L https://graph.microsoft.com/v1.0/drives/{{document_library_id}}/items/{{file_id}}/content"

; Execute the request.
; 
; HttpCurl examines the target request and determines that both
; document_library_id and file_id are required.
; 
; To obtain these values, it automatically builds and executes
; the following dependency chain:
; 
;   1) getSite      -> site_id
;   2) getDrives    -> document_library_id
;   3) getFiles     -> file_id
;   4) download     -> file content
; 
; The final response returned by DoYourThing is the downloaded
; file content from the target request.
$bSuccess = $oCurl.DoYourThing($sCurlCommand)
If ($bSuccess = False) Then
    ConsoleWrite($oCurl.LastErrorText & @CRLF)
    Exit
EndIf

; A successful Graph response should return HTTP 200.
; Any other status code typically indicates an authentication,
; permission, site lookup, document library lookup, or file lookup error.
Local $iStatusCode = $oCurl.StatusCode
If ($iStatusCode <> 200) Then
    ConsoleWrite($oCurl.ResponseBodyStr & @CRLF)
    ConsoleWrite("status code = " & $iStatusCode & @CRLF)
    Exit
EndIf

; The response body contains the contents of the downloaded file.
$oSbFileContents = ObjCreate("Chilkat.StringBuilder")
$oCurl.GetResponseSb($oSbFileContents)

; Optionally save the downloaded content to a local file.
; 
; The third argument controls whether the file is appended.
; Passing ckfalse causes the file to be overwritten if it already exists.
$bSuccess = $oSbFileContents.WriteFile("c:/temp/hamlet.json","utf-8",False)
If ($bSuccess = False) Then
    ConsoleWrite($oSbFileContents.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Success." & @CRLF)