onedrive: add support for no admin mode

Add tenant_url configuration option for accessing OneDrive/SharePoint
without admin privileges. When tenant_url is set, rclone uses the
SharePoint v2.0 API endpoint instead of the standard Microsoft Graph
API.

Co-Authored-By: KyokoMiki <161209740+kyokomiki@users.noreply.github.com>

backend/onedrive/onedrive.go

@@ -154,6 +154,21 @@ See: https://github.com/rclone/rclone/issues/1716
 `,
 			Default:  fs.SizeSuffix(-1),
 			Advanced: true,
+		}, {
+			Name: "tenant_url",
+			Help: `The tenant URL for non-admin OneDrive access.
+
+Set this to your SharePoint tenant URL to use the SharePoint v2.0 API
+endpoint instead of the standard Microsoft Graph API. This allows
+accessing business OneDrive without admin consent.
+
+The URL can be found in your browser's developer tools by searching
+for "driveAccessToken" in the network requests. Look for the
+".driveUrl" field which contains the tenant URL and drive ID.
+
+Example: https://your-tenant.sharepoint.com/_api`,
+			Default:  "",
+			Advanced: true,
 		}, {
 			Name: "chunk_size",
 			Help: `Chunk size to upload files with - must be multiple of 320k (327,680 bytes).
@@ -471,7 +486,15 @@ isn't always desirable to set the permissions from the metadata.
 // Get the region and graphURL from the config
 func getRegionURL(m configmap.Mapper) (region, graphURL string) {
 	region, _ = m.Get("region")
+
 	graphURL = graphAPIEndpoint[region] + "/v1.0"
+
+	// Check if tenant_url is provided for non-admin mode
+	tenantURL, _ := m.Get("tenant_url")
+	if tenantURL != "" {
+		graphURL = tenantURL + "/v2.0"
+	}
+
 	return region, graphURL
 }
 
@@ -764,6 +787,7 @@ type Options struct {
 	Region                  string               `config:"region"`
 	UploadCutoff            fs.SizeSuffix        `config:"upload_cutoff"`
 	ChunkSize               fs.SizeSuffix        `config:"chunk_size"`
+	TenantURL               string               `config:"tenant_url"`
 	DriveID                 string               `config:"drive_id"`
 	DriveType               string               `config:"drive_type"`
 	RootFolderID            string               `config:"root_folder_id"`
@@ -1070,6 +1094,10 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
 
 	rootURL := graphAPIEndpoint[opt.Region] + "/v1.0" + "/drives/" + opt.DriveID
 
+	if opt.TenantURL != "" {
+		rootURL = opt.TenantURL + "/v2.0" + "/drives/" + opt.DriveID
+	}
+
 	oauthConfig, err := makeOauthConfig(ctx, opt)
 	if err != nil {
 		return nil, err
@@ -2738,7 +2766,13 @@ func (o *Object) ID() string {
 // and returns itemID, driveID, rootURL.
 // Such a normalized ID can come from (*Item).GetID()
 func (f *Fs) parseNormalizedID(ID string) (string, string, string) {
-	rootURL := graphAPIEndpoint[f.opt.Region] + "/v1.0/drives"
+	var rootURL string
+	if f.opt.TenantURL != "" {
+		rootURL = f.opt.TenantURL + "/v2.0/drives"
+	} else {
+		rootURL = graphAPIEndpoint[f.opt.Region] + "/v1.0/drives"
+	}
+
 	if strings.Contains(ID, "#") {
 		s := strings.Split(ID, "#")
 		return s[1], s[0], rootURL
@@ -2933,7 +2967,12 @@ func (f *Fs) changeNotifyNextChange(ctx context.Context, token string) (delta ap
 }
 
 func (f *Fs) buildDriveDeltaOpts(token string) rest.Opts {
-	rootURL := graphAPIEndpoint[f.opt.Region] + "/v1.0/drives"
+	var rootURL string
+	if f.opt.TenantURL != "" {
+		rootURL = f.opt.TenantURL + "/v2.0/drives"
+	} else {
+		rootURL = graphAPIEndpoint[f.opt.Region] + "/v1.0/drives"
+	}
 
 	return rest.Opts{
 		Method:     "GET",

docs/content/onedrive.md

@@ -237,6 +237,41 @@ credentials.
 anyone with the *Client ID* and *Client Secret* can access your
 OneDrive files. Take care to safeguard these credentials.
 
+### Non-admin access to Business OneDrive
+
+If you do not have admin access to your organization's OneDrive for
+Business, you can still connect by manually providing the SharePoint
+tenant URL and drive ID. This works by overriding the base API URL
+from the standard Microsoft Graph endpoint to the SharePoint v2.0
+endpoint.
+
+#### Steps to manually obtain credentials
+
+1. Open your browser and navigate to `https://[your-tenant].sharepoint.com/`
+2. Open Developer Tools (press F12) and go to the **Network** tab.
+3. Search for `driveAccessToken` in the network requests.
+4. Extract the following information from the response:
+   ```json
+   ".driveUrl": "{tenant_url}/v2.0/drives/{drive_id}",
+   ".driveAccessToken": "access_token={access_token}"
+   ```
+
+#### Rclone configuration
+
+Use the extracted values to configure your remote:
+
+```ini
+type = onedrive
+token = {"access_token":"{access_token}","token_type":"Bearer","refresh_token":"","expiry":"2045-12-31T23:59:59Z"}
+drive_id = {drive_id}
+tenant_url = {tenant_url}
+drive_type = business
+```
+
+Since the exact expiry time cannot be determined from web traffic,
+set the expiry to a future date. Note that the token will eventually
+expire and you will need to repeat the process to obtain a new one.
+
 ### Modification times and hashes
 
 OneDrive allows modification times to be set on objects accurate to 1