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Explorer | Level 3

2 years ago

Powershell Oauth2 Refresh Token

Hey all! Thanks in advanced. I am trying to write a powershell script to get an offline refresh token so I can do unattended uploads. The problem is that I have to authenticate for an author...

Greg-DB
2 years ago
I'm not sure what you mean when you say you are "not getting any type of response from the curl command". For reference, if you need to debug something with curl, you can use the "-v" flag to enable verbose mode.

In any case, I haven't tested your new code, but the parameters look right. I also don't see where you retrieve the access token from the new /oauth2/token call, but assuming you do either manually or in code not shown, it seems right. Does it work for you when you run it?

Explorer | Level 3

So I used this code to upload files. I tried using the refresh token and it doesn't work...

$refresh_token = "hssEaww....REFRESHTOKENWENTHERE"

$upload_url = "https://content.dropboxapi.com/2/files/upload"

$headers = @{

Authorization = "Bearer $refresh_token"

"Content-Type" = "application/octet-stream"

}

# Read the file as a byte array and upload it to Dropbox

$file_bytes = [System.IO.File]::ReadAllBytes($file_path)

$outputFile = Split-Path "C:\FILEHERE.TXT" -leaf

$TargetFilePath = "/$outputFile"

$arg = '{ "path": "' + $TargetFilePath + '", "mode": "add", "autorename": true, "mute": false }'

$authorization = "Bearer " + $refresh_token

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"

$headers.Add("Authorization", $authorization)

$headers.Add("Dropbox-API-Arg", $arg)

$headers.Add("Content-Type", 'application/octet-stream')

$response = Invoke-RestMethod -Uri https://content.dropboxapi.com/2/files/upload -Method Post -InFile $SourceFilePath -Headers $headers

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Dropbox Staff

2 years ago

Access tokens and refresh tokens are different objects and are not interchangeable, so you can't use a refresh token as an access token like that. Instead, whenever you need a new short-lived access token you should call /oauth2/token with grant_type=refresh_token and refresh_token set to the refresh token, like in step 5 of this example. That call will return a new short-lived access token which you can then use to make further API calls, such as /2/files/upload.

lucasj
Explorer | Level 3
2 years ago
Is this correct? If so, I'm not getting any type of response from the curl command

$refreshToken = "REFRESHTOKENHERE"
$appKey = "APPKEYHERE"
$appSecret = "APPSECRETHERE"

$response = Invoke-RestMethod -Uri "https://api.dropbox.com/oauth2/token" -Method POST -Body @{
refresh_token = $refreshToken
grant_type = "refresh_token"
client_id = $appKey
client_secret = $appSecret
}

$response
# Set up the URL to upload the file
$upload_url = "https://content.dropboxapi.com/2/files/upload"

# Set up the request headers with the authorization and content-type
$headers = @{
Authorization = "Bearer $access_token"
"Content-Type" = "application/octet-stream"
}
- Greg-DB
  Dropbox Staff
  2 years ago
  I'm not sure what you mean when you say you are "not getting any type of response from the curl command". For reference, if you need to debug something with curl, you can use the "-v" flag to enable verbose mode.
  
  In any case, I haven't tested your new code, but the parameters look right. I also don't see where you retrieve the access token from the new /oauth2/token call, but assuming you do either manually or in code not shown, it seems right. Does it work for you when you run it?
  - lucasj
    Explorer | Level 3
    2 years ago
    Thanks Greg! I think I figured it out. I'm going to post code for future users with this problem.
    
    This is the full code to get the refresh token. Replace the variables at the top where it cays CLIENTIDHERE and CLIENTSECRETHERE. Also the auth_url has a space where you have to put the CLIENTID
    
    Once you run it, a web browser will pop up and you'll need to copy the code on the right side of the URL that pops up. This is your authorization_code that you'll have to enter in the prompt. Once you enter in the authorization code, it will give you a refresh token:
    
    $client_id = "CLIENTIDHERE"
    $client_secret = "CLIENTSECRETHERE"
    $redirectUri = "https://www.dropbox.com/1/oauth2/redirect_receiver"
    $auth_url = "https://www.dropbox.com/oauth2/authorize"
    $token_url = "https://api.dropboxapi.com/oauth2/token"
    
    # Set up the OAuth2 authorization URL
    #$scope = "offline"
    #$auth_url = "{0}?response_type=code&client_id={1}&scope={2}" -f $auth_url, $client_id, $scope
    $auth_url = "https://www.dropbox.com/oauth2/authorize?client_id=CLIENTIDHERE&response_type=code&redirect_uri=$redirectUri&token_access_type=offline"
    
    # Open the authorization URL in the default web browser and prompt the user to sign in and authorize your app
    Start-Process $auth_url
    Write-Host "Please sign in and authorize your app in the browser window that just opened."
    
    # Prompt the user to enter the authorization code provided by Dropbox after they have authorized your app
    $authorization_code = Read-Host "Enter the authorization code provided by Dropbox"
    
    # Set up the access token request parameters
    $body = @{
    code = $authorization_code
    grant_type = "authorization_code"
    client_id = $client_id
    redirect_uri = $redirectUri
    client_secret = $client_secret
    }
    
    # Send the access token request and parse the response for the access token and refresh token
    $response = Invoke-RestMethod -Method Post -Uri $token_url -Body $body
    $access_token = $response.access_token
    $refresh_token = $response.refresh_token
    
    # Use the access token to make API calls to Dropbox
    # For example, you can list the contents of the root folder like this:
    $headers = @{
    "Authorization" = "Bearer $access_token"
    }
    $list_url = "https://api.dropboxapi.com/2/files/list_folder"
    $list_body = @{
    path = ""
    recursive = $false
    }
    $list_response = Invoke-RestMethod -Method Post -Uri $list_url -Headers $headers -Body ($list_body | ConvertTo-Json)
    $list_response.entries | Select-Object name, path_display
    
    # Output the access token and refresh token to the console
    Write-Host "Your access token is: $access_token"
    Write-Host "Your refresh token is: $refresh_token"
    
    Then this is the code that creates a function to use the refresh token to upload a file. You just need the file path as a parameter to the function.
    
    function DropBox-Upload {
    [CmdletBinding()]
    param (
    [Parameter (Mandatory = $True, ValueFromPipeline = $True)]
    [Alias("f")]
    [string]$SourceFilePath
    )
    $refreshToken = "REFRESHTOKENHERE"
    $appKey = "CLIENTIDHERE"
    $appSecret = "CLIENTSECRETHERE"
    
    $response = Invoke-RestMethod -Uri "https://api.dropbox.com/oauth2/token" -Method POST -Body @{
    refresh_token = $refreshToken
    grant_type = "refresh_token"
    client_id = $appKey
    client_secret = $appSecret
    } -Verbose
    
    $responseAccessToken = $response | select-object -expand "access_token"
    $responseAccessToken
    
    # Set up the URL to upload the file
    $upload_url = "https://content.dropboxapi.com/2/files/upload"
    
    # Set up the request headers with the authorization and content-type
    $access_token = $responseAccessToken
    $headers = @{
    Authorization = "Bearer $access_token"
    "Content-Type" = "application/octet-stream"
    }
    
    $outputFile = Split-Path $SourceFilePath -leaf
    $TargetFilePath = "/$outputFile"
    $arg = '{ "path": "' + $TargetFilePath + '", "mode": "add", "autorename": true, "mute": false }'
    $authorization = "Bearer " + $access_token
    $headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
    $headers.Add("Authorization", $authorization)
    $headers.Add("Dropbox-API-Arg", $arg)
    $headers.Add("Content-Type", 'application/octet-stream')
    
    $response = Invoke-RestMethod -Uri https://content.dropboxapi.com/2/files/upload -Method Post -InFile $SourceFilePath -Headers $headers
    }

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