azr: Credential Chain for Seamless 'OAuth 2.0' Authentication to 'Azure Services'

Description

Implements a credential chain for 'Azure OAuth 2.0' authentication based on the package 'httr2”s 'OAuth' framework. Sequentially attempts authentication methods until one succeeds. During development allows interactive browser-based flows ('Device Code' and 'Auth Code' flows) and non-interactive flow ('Client Secret') in batch mode.

Author(s)

Maintainer: Pedro Baltazar pedrobtz@gmail.com

See Also

Useful links:

• https://pedrobtz.github.io/azr/

• https://github.com/pedrobtz/azr

• Report bugs at https://github.com/pedrobtz/azr/issues

Authorization code credential authentication

Description

Authenticates a user through the OAuth 2.0 authorization code flow. This flow opens a web browser for the user to sign in.

Details

The authorization code flow is the standard OAuth 2.0 flow for interactive authentication. It requires a web browser and is suitable for applications where the user can interact with a browser window.

The credential supports token caching to avoid repeated authentication. Tokens can be cached to disk or in memory. A redirect URI is required for the OAuth flow to complete.

Super classes

azr::Credential -> azr::InteractiveCredential -> AuthCodeCredential

Methods

Public methods

• AuthCodeCredential$new()

• AuthCodeCredential$get_token()

• AuthCodeCredential$req_auth()

• AuthCodeCredential$clone()

Method new()

Create a new authorization code credential

Usage

AuthCodeCredential$new(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  use_cache = "disk",
  offline = TRUE,
  redirect_uri = default_redirect_uri()
)

Arguments

Returns

A new AuthCodeCredential object

Method get_token()

Get an access token using authorization code flow

Usage

AuthCodeCredential$get_token(reauth = FALSE)

Arguments

Returns

An httr2::oauth_token() object containing the access token

Method req_auth()

Add OAuth authorization code authentication to an httr2 request

Usage

AuthCodeCredential$req_auth(req)

Arguments

Returns

The request object with OAuth authorization code authentication configured

Method clone()

The objects of this class are cloneable with this method.

Usage

AuthCodeCredential$clone(deep = FALSE)

Arguments

Examples

# AuthCodeCredential requires an interactive session
## Not run: 
# Create credential with default settings
cred <- AuthCodeCredential$new(
  tenant_id = "your-tenant-id",
  client_id = "your-client-id",
  scope = "https://management.azure.com/.default"
)

# Get an access token (will open browser for authentication)
token <- cred$get_token()

# Force reauthentication
token <- cred$get_token(reauth = TRUE)

# Use with httr2 request
req <- httr2::request("https://management.azure.com/subscriptions")
req <- cred$req_auth(req)

## End(Not run)

Azure CLI credential authentication

Description

Authenticates using the Azure CLI (az) command-line tool. This credential requires the Azure CLI to be installed and the user to be logged in via ⁠az login⁠.

Details

The credential uses the ⁠az account get-access-token⁠ command to retrieve access tokens. It will use the currently active Azure CLI account and subscription unless a specific tenant is specified.

Super class

azr::Credential -> AzureCLICredential

Public fields

Methods

Public methods

• AzureCLICredential$new()

• AzureCLICredential$get_token()

• AzureCLICredential$req_auth()

• AzureCLICredential$account_show()

• AzureCLICredential$login()

• AzureCLICredential$logout()

• AzureCLICredential$clone()

Method new()

Create a new Azure CLI credential

Usage

AzureCLICredential$new(
  scope = NULL,
  tenant_id = NULL,
  process_timeout = NULL,
  login = FALSE,
  use_bridge = FALSE
)

Arguments

Returns

A new AzureCLICredential object

Method get_token()

Get an access token from Azure CLI

Usage

AzureCLICredential$get_token(scope = NULL)

Arguments

Returns

An httr2::oauth_token() object containing the access token

Method req_auth()

Add authentication to an httr2 request

Usage

AzureCLICredential$req_auth(req, scope = NULL)

Arguments

Returns

The request object with authentication header added

Method account_show()

Show the currently active Azure CLI account information

Usage

AzureCLICredential$account_show(timeout = NULL)

Arguments

Returns

A list containing the account information from Azure CLI

Method login()

Perform Azure CLI login using device code flow

Usage

AzureCLICredential$login()

Returns

Invisibly returns the exit status (0 for success, non-zero for failure)

Method logout()

Log out from Azure CLI

Usage

AzureCLICredential$logout()

Returns

Invisibly returns NULL

Method clone()

The objects of this class are cloneable with this method.

Usage

AzureCLICredential$clone(deep = FALSE)

Arguments

Examples

# Create credential with default settings
cred <- AzureCLICredential$new()

# Create credential with specific scope and tenant
cred <- AzureCLICredential$new(
  scope = "https://management.azure.com/.default",
  tenant_id = "your-tenant-id"
)

# To get a token or authenticate a request it is required that
# 'az login' is successfully executed, otherwise it will return an error.
## Not run: 
# Get an access token
token <- cred$get_token()

# Use with httr2 request
req <- httr2::request("https://management.azure.com/subscriptions")
resp <- httr2::req_perform(cred$req_auth(req))

## End(Not run)

Client secret credential authentication

Description

Authenticates a service principal using a client ID and client secret. This credential is commonly used for application authentication in Azure.

Details

The credential uses the OAuth 2.0 client credentials flow to obtain access tokens. It requires a registered Azure AD application with a client secret. The client secret should be stored securely and not hard-coded in scripts.

Super class

azr::Credential -> ClientSecretCredential

Methods

Public methods

• ClientSecretCredential$validate()

• ClientSecretCredential$get_token()

• ClientSecretCredential$req_auth()

• ClientSecretCredential$clone()

Method validate()

Validate the credential configuration

Usage

ClientSecretCredential$validate()

Details

Checks that the client secret is provided and not NA or NULL. Calls the parent class validation method.

Method get_token()

Get an access token using client credentials flow

Usage

ClientSecretCredential$get_token()

Returns

An httr2::oauth_token() object containing the access token

Method req_auth()

Add OAuth client credentials authentication to an httr2 request

Usage

ClientSecretCredential$req_auth(req)

Arguments

Returns

The request object with OAuth client credentials authentication configured

Method clone()

The objects of this class are cloneable with this method.

Usage

ClientSecretCredential$clone(deep = FALSE)

Arguments

Examples

# Create credential with client secret
cred <- ClientSecretCredential$new(
  tenant_id = "your-tenant-id",
  client_id = "your-client-id",
  client_secret = "your-client-secret",
  scope = "https://management.azure.com/.default"
)

# To get a token or authenticate a request it requires
# valid 'client_id' and 'client_secret' credentials,
# otherwise it will return an error.
## Not run: 
# Get an access token
token <- cred$get_token()

# Use with httr2 request
req <- httr2::request("https://management.azure.com/subscriptions")
resp <- httr2::req_perform(cred$req_auth(req))

## End(Not run)

Device code credential authentication

Description

Authenticates a user through the device code flow. This flow is designed for devices that don't have a web browser or have input constraints.

Details

The device code flow displays a code that the user must enter on another device with a web browser to complete authentication. This is ideal for CLI applications, headless servers, or devices without a browser.

The credential supports token caching to avoid repeated authentication. Tokens can be cached to disk or in memory.

Super classes

azr::Credential -> azr::InteractiveCredential -> DeviceCodeCredential

Methods

Public methods

• DeviceCodeCredential$new()

• DeviceCodeCredential$get_token()

• DeviceCodeCredential$req_auth()

• DeviceCodeCredential$clone()

Method new()

Create a new device code credential

Usage

DeviceCodeCredential$new(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  use_cache = "disk",
  offline = TRUE
)

Arguments

Returns

A new DeviceCodeCredential object

Method get_token()

Get an access token using device code flow

Usage

DeviceCodeCredential$get_token(reauth = FALSE)

Arguments

Returns

An httr2::oauth_token() object containing the access token

Method req_auth()

Add OAuth device code authentication to an httr2 request

Usage

DeviceCodeCredential$req_auth(req)

Arguments

Returns

The request object with OAuth device code authentication configured

Method clone()

The objects of this class are cloneable with this method.

Usage

DeviceCodeCredential$clone(deep = FALSE)

Arguments

Examples

# DeviceCodeCredential requires an interactive session
## Not run: 
# Create credential with default settings
cred <- DeviceCodeCredential$new()

# Get an access token (will prompt for 'device code' flow)
token <- cred$get_token()

# Force re-authentication
token <- cred$get_token(reauth = TRUE)

# Use with httr2 request
req <- httr2::request("https://management.azure.com/subscriptions")
req <- cred$req_auth(req)

## End(Not run)

Interactive credential base class

Description

Base class for interactive authentication credentials. This class should not be instantiated directly; use DeviceCodeCredential or AuthCodeCredential instead.

Super class

azr::Credential -> InteractiveCredential

Methods

Public methods

• InteractiveCredential$is_interactive()

• InteractiveCredential$clone()

Method is_interactive()

Check if the credential is interactive

Usage

InteractiveCredential$is_interactive()

Returns

Always returns TRUE for interactive credentials

Method clone()

The objects of this class are cloneable with this method.

Usage

InteractiveCredential$clone(deep = FALSE)

Arguments

Azure API Client

Description

An R6 class that provides a base HTTP client for interacting with Azure APIs. This client handles authentication, request building, retry logic, logging, and error handling for Azure API requests.

Details

The api_client class is designed to be a base class for Azure service-specific clients. It provides:

• Automatic authentication using Azure credentials

• Configurable retry logic with exponential backoff

• Request and response logging

• JSON, XML, and HTML content type handling

• Standardized error handling

Public fields

Methods

Public methods

• api_client$new()

• api_client$.fetch()

• api_client$.req_build()

• api_client$.req_perform()

• api_client$.resp_content()

• api_client$.get_token()

• api_client$clone()

Method new()

Create a new API client instance

Usage

api_client$new(
  host_url,
  provider = NULL,
  credentials = NULL,
  timeout = 60L,
  connecttimeout = 30L,
  max_tries = 5L,
  response_handler = NULL
)

Arguments

Returns

A new api_client object

Method .fetch()

Make an HTTP request to the API

Usage

api_client$.fetch(
  path,
  ...,
  req_data = NULL,
  req_method = "get",
  verbosity = 0L,
  content = c("body", "headers", "response", "request"),
  content_type = NULL
)

Arguments

Returns

Depends on the content parameter:

• "body": Parsed response body (list, data.frame, or character)

• "headers": List of response headers

• "response": Full httr2::response() object

• "request": httr2::request() object

Method .req_build()

Build an HTTP request object

Usage

api_client$.req_build(path, ..., req_data = NULL, req_method = "get")

Arguments

Returns

An httr2::request() object ready for execution

Method .req_perform()

Perform an HTTP request and log the results

Usage

api_client$.req_perform(req, verbosity)

Arguments

Returns

An httr2::response() object containing the API response

Method .resp_content()

Extract and parse response content

Usage

api_client$.resp_content(resp, content_type = NULL)

Arguments

Returns

Parsed response body. Format depends on content type:

• JSON: List or data.frame

• XML: xml2 document

• HTML: xml2 document

• Other: Character string

Method .get_token()

Get authentication token from the credential provider

Usage

api_client$.get_token()

Returns

An httr2::oauth_token() object if a provider is available, otherwise returns NULL with a warning.

Method clone()

The objects of this class are cloneable with this method.

Usage

api_client$clone(deep = FALSE)

Arguments

Examples

## Not run: 
# Create a client with default credentials
client <- api_client$new(
  host_url = "https://management.azure.com"
)

# Create a client with a credential provider
cred_provider <- get_credential_provider(
  scope = "https://management.azure.com/.default"
)
client <- api_client$new(
  host_url = "https://management.azure.com",
  provider = cred_provider
)

# Create a client with custom credentials function
client <- api_client$new(
  host_url = "https://management.azure.com",
  credentials = my_credential_function,
  timeout = 120,
  max_tries = 3
)

# Create a client with custom response handler
custom_handler <- function(content) {
  # Custom processing logic - e.g., keep data frames as-is
  content
}
client <- api_client$new(
  host_url = "https://management.azure.com",
  response_handler = custom_handler
)

# Make a GET request
response <- client$.fetch(
  path = "/subscriptions/{subscription_id}/resourceGroups",
  subscription_id = "my-subscription-id",
  req_method = "get"
)

## End(Not run)

Microsoft Graph API Resource

Description

An R6 class that extends api_resource to provide specialized methods for the Microsoft Graph API. This class adds convenience methods for common Graph operations.

Super class

azr::api_resource -> api_graph_resource

Methods

Public methods

• api_graph_resource$me()

• api_graph_resource$clone()

Method me()

Fetch the current user's profile

Usage

api_graph_resource$me(select = NULL)

Arguments

Returns

The response from the /me endpoint

Method clone()

The objects of this class are cloneable with this method.

Usage

api_graph_resource$clone(deep = FALSE)

Arguments

Azure API Resource

Description

An R6 class that wraps an api_client and adds an additional path segment (like "beta" or "v1.0") to all requests. This is useful for APIs that version their endpoints or have different API surfaces under different paths.

Details

The api_resource class creates a modified base request by appending an endpoint path to the client's base request. All subsequent API calls through this resource will automatically include this path prefix.

Public fields

Methods

Public methods

• api_resource$new()

• api_resource$clone()

Method new()

Create a new API resource instance

Usage

api_resource$new(client, endpoint)

Arguments

Returns

A new api_resource object

Method clone()

The objects of this class are cloneable with this method.

Usage

api_resource$clone(deep = FALSE)

Arguments

Examples

## Not run: 
# Create a client
client <- api_client$new(
  host_url = "https://graph.microsoft.com"
)

# Create a resource with v1.0 API endpoint
resource_v1 <- api_resource$new(
  client = client,
  endpoint = "v1.0"
)

# Create a resource with beta API endpoint
resource_beta <- api_resource$new(
  client = client,
  endpoint = "beta"
)

# Make requests - the endpoint is automatically prepended
response <- resource_v1$.fetch(
  path = "/me",
  req_method = "get"
)

## End(Not run)

API Service Base Class

Description

Base R6 class for creating API service wrappers. This class provides a foundation for building service-specific API clients with authentication, endpoint management, and configuration.

Public fields

Methods

Public methods

• api_service$new()

Method new()

Create a new API service instance

Usage

api_service$new(
  client = NULL,
  chain = NULL,
  endpoints = list(),
  config = list()
)

Arguments

Returns

A new api_service object

Show Azure CLI Account Information

Description

Retrieves information about the currently active Azure CLI account and subscription. This function runs ⁠az account show⁠ and parses the JSON output into an R list.

Usage

az_cli_account_show(timeout = 10L)

Arguments

Details

The function returns details about the current Azure subscription including:

• Subscription ID and name

• Tenant ID

• Account state (e.g., "Enabled")

• User information

• Cloud environment details

Value

A list containing the account information from Azure CLI

Examples

## Not run: 
# Get current account information
account_info <- az_cli_account_show()

# Access subscription ID
subscription_id <- account_info$id

# Access tenant ID
tenant_id <- account_info$tenantId

## End(Not run)

Get Access Token from Azure CLI

Description

Retrieves an access token from Azure CLI using the ⁠az account get-access-token⁠ command. This is a lower-level function that directly interacts with the Azure CLI to obtain OAuth2 tokens.

Usage

az_cli_get_token(scope, tenant_id = NULL, timeout = 10L)

Arguments

Details

This function executes the Azure CLI command and parses the JSON response to create an httr2 OAuth token object. The token includes the access token, token type, and expiration time.

Value

An httr2::oauth_token() object containing:

• access_token: The OAuth2 access token string

• token_type: The type of token (typically "Bearer")

• .expires_at: POSIXct timestamp when the token expires

Examples

## Not run: 
# Get a token for Azure Resource Manager
token <- az_cli_get_token(
  scope = "https://management.azure.com/.default"
)

# Get a token for a specific tenant
token <- az_cli_get_token(
  scope = "https://graph.microsoft.com/.default",
  tenant_id = "your-tenant-id"
)

# Access the token string
access_token <- token$access_token

## End(Not run)

Check if User is Logged in to Azure CLI

Description

Checks whether the user is currently logged in to Azure CLI by attempting to retrieve account information.

Usage

az_cli_is_login(timeout = 10L)

Arguments

Value

A logical value: TRUE if the user is logged in, FALSE otherwise

Examples

## Not run: 
# Check if logged in
if (az_cli_is_login()) {
  message("User is logged in")
} else {
  message("User is not logged in")
}

## End(Not run)

Azure CLI Device Code Login

Description

Performs an interactive Azure CLI login using device code flow. Automatically captures the device code, copies it to the clipboard, and opens the browser for authentication.

Usage

az_cli_login(tenant_id = NULL, use_bridge = FALSE, verbose = FALSE)

Arguments

Details

This function runs ⁠az login --use-device-code⁠, monitors the output to extract the device code, copies it to the clipboard, and opens the authentication URL in the default browser.

Value

Invisibly returns the exit status (0 for success, non-zero for failure)

Examples

## Not run: 
# Perform Azure CLI login with device code flow
az_cli_login()

# Use the bridge webpage for easier code handling
az_cli_login(use_bridge = TRUE)

# Login to a specific tenant with verbose output
az_cli_login(tenant_id = "your-tenant-id", verbose = TRUE)

## End(Not run)

Azure CLI Logout

Description

Logs out from Azure CLI by removing all stored credentials and account information. This function runs ⁠az logout⁠.

Usage

az_cli_logout()

Details

After logging out, you will need to run az_cli_login() again to authenticate and use Azure CLI credentials.

Value

Invisibly returns NULL

Examples

## Not run: 
# Log out from Azure CLI
az_cli_logout()

## End(Not run)

Create a Microsoft Graph API Client

Description

Creates a configured client for the Microsoft Graph API with authentication and versioned endpoints (v1.0 and beta). This function returns an api_service object that provides access to Microsoft Graph resources through versioned endpoints.

Usage

azr_graph_client(scopes = ".default", ..., chain = NULL)

Arguments

Details

The function creates a Microsoft Graph service using these components:

• api_client: A general-purpose API client configured with the Graph API host URL (⁠https://graph.microsoft.com⁠) and authentication provider.

• api_graph_resource: A specialized resource class that extends api_resource with Microsoft Graph-specific methods. Currently implements:

  • me(select = NULL): Fetch the current user's profile. The select parameter accepts a character vector of properties to return (e.g., c("displayName", "mail")).

• api_service: A service container that combines the client and resources with versioned endpoints (v1.0 and beta). The service is locked using lockEnvironment() to prevent modification after creation.

Value

An api_service object configured for Microsoft Graph API with v1.0 and beta endpoints. The object is locked using lockEnvironment() to prevent modification after creation. Access endpoints via ⁠$v1.0⁠ or ⁠$beta⁠.

Examples

## Not run: 
# Create a Graph API client with default credentials
graph <- azr_graph_client()

# Fetch current user profile from v1.0 endpoint
me <- graph$v1.0$me()

# Fetch specific properties using OData $select
me <- graph$v1.0$me(select = c("displayName", "mail", "userPrincipalName"))

# Use beta endpoint for preview features
me_beta <- graph$beta$me(select = c("displayName", "mail"))

# Create with a custom credential chain
custom_chain <- credential_chain(
  AzureCLICredential$new(scope = "https://graph.microsoft.com/.default")
)
graph <- azr_graph_client(chain = custom_chain)

# Use specific scopes instead of .default
graph <- azr_graph_client(scopes = "User.Read Mail.Read")

## End(Not run)

Azure Authority Host URLs

Description

Login endpoint URLs for different Azure cloud environments.

Usage

azure_authority_hosts

Format

An object of class list of length 3.

Azure Default Client Configuration

Description

Default client ID and tenant ID used for Azure authentication when not explicitly provided. The client ID is Microsoft's public Azure CLI client ID.

Usage

azure_client

Format

An object of class list of length 2.

Common Azure OAuth Scopes

Description

Predefined OAuth scopes for common Azure services.

Usage

azure_scopes

Format

An object of class list of length 5.

Create Custom Credential Chain

Description

Creates a custom chain of credential providers to attempt during authentication. Credentials are tried in the order they are provided until one successfully authenticates. This allows you to customize the authentication flow beyond the default credential chain.

Usage

credential_chain(...)

Arguments

Value

A credential_chain object containing the specified sequence of credential providers.

See Also

default_credential_chain(), get_token_provider()

Examples

# Create a custom chain with only non-interactive credentials
custom_chain <- credential_chain(
  client_secret = ClientSecretCredential,
  azure_cli = AzureCLICredential
)

# Use the custom chain to get a token
## Not run: 
token <- get_token(
  scope = "https://graph.microsoft.com/.default",
  chain = custom_chain
)

## End(Not run)

Get default Azure client ID

Description

Retrieves the Azure client ID from the AZURE_CLIENT_ID environment variable, or falls back to the default Azure CLI client ID if not set.

Usage

default_azure_client_id()

Value

A character string with the client ID

Examples

default_azure_client_id()

Get default Azure client secret

Description

Retrieves the Azure client secret from the AZURE_CLIENT_SECRET environment variable, or returns NA_character_ if not set.

Usage

default_azure_client_secret()

Value

A character string with the client secret, or NA_character_ if not set

Examples

default_azure_client_secret()

Get default Azure configuration directory

Description

Retrieves the Azure configuration directory from the AZURE_CONFIG_DIR environment variable, or falls back to the platform-specific default.

Usage

default_azure_config_dir()

Value

A character string with the Azure configuration directory path

Examples

default_azure_config_dir()

Get default Azure authority host

Description

Retrieves the Azure authority host from the AZURE_AUTHORITY_HOST environment variable, or falls back to Azure Public Cloud if not set.

Usage

default_azure_host()

Value

A character string with the authority host URL

Examples

default_azure_host()

Create default Azure OAuth client

Description

Creates an httr2::oauth_client() configured for Azure authentication.

Usage

default_azure_oauth_client(
  client_id = default_azure_client_id(),
  client_secret = NULL,
  name = NULL
)

Arguments

Value

An httr2::oauth_client() object

Examples

client <- default_azure_oauth_client()
client <- default_azure_oauth_client(
  client_id = "my-client-id",
  client_secret = "my-secret"
)

Get default Azure OAuth scope

Description

Returns the default OAuth scope for a specified Azure resource.

Usage

default_azure_scope(resource = "azure_arm")

Arguments

Value

A character string with the OAuth scope URL

Examples

default_azure_scope()
default_azure_scope("azure_graph")

Get default Azure tenant ID

Description

Retrieves the Azure tenant ID from the AZURE_TENANT_ID environment variable, or falls back to the default value if not set.

Usage

default_azure_tenant_id()

Value

A character string with the tenant ID

Examples

default_azure_tenant_id()

Get default Azure OAuth URLs

Description

Constructs Azure OAuth 2.0 endpoint URLs for a given tenant and authority host.

Usage

default_azure_url(
  endpoint = NULL,
  oauth_host = default_azure_host(),
  tenant_id = default_azure_tenant_id()
)

Arguments

Value

If endpoint is specified, returns a character string with the URL. If endpoint is NULL, returns a named list of all endpoint URLs.

Examples

# Get all URLs
default_azure_url()

# Get specific endpoint
default_azure_url("token")

# Custom tenant
default_azure_url("authorize", tenant_id = "my-tenant-id")

Create Default Credential Chain

Description

Creates the default chain of credentials to attempt during authentication. The credentials are tried in order until one successfully authenticates. The default chain includes:

1. Client Secret Credential - Uses client ID and secret

2. Authorization Code Credential - Interactive browser-based authentication

3. Azure CLI Credential - Uses credentials from Azure CLI

4. Device Code Credential - Interactive device code flow

Usage

default_credential_chain()

Value

A credential_chain object containing the default sequence of credential providers.

See Also

credential_chain(), get_token_provider()

Default No Authentication

Description

A pass-through credential function that performs no authentication. This function returns the request object unchanged, allowing API calls to be made without adding any authentication headers or tokens.

Usage

default_non_auth(req)

Arguments

Value

The same httr2::request() object, unmodified

Get default OAuth redirect URI

Description

Constructs a redirect URI for OAuth flows. If the provided URI doesn't have a port, assigns a random port using httpuv::randomPort().

Usage

default_redirect_uri(redirect_uri = httr2::oauth_redirect_uri())

Arguments

Value

A character string with the redirect URI

Examples

default_redirect_uri()

Default Response Handler

Description

Default callback function for processing API response content. This function converts data frames within lists to data.table objects for better performance and functionality, if the data.table package is available.

Usage

default_response_handler()

Details

The function recursively processes list responses and converts any data.frame objects to data.table objects using data.table::as.data.table(), but only if the data.table package is installed. If data.table is not available, data frames are returned unchanged. Non-data.frame elements are always returned unchanged.

Value

A function that accepts parsed response content and returns processed content

Examples

# Get the default handler
handler <- default_response_handler()

# Use with a custom handler
custom_handler <- function(content) {
  # Your custom processing logic
  content
}

Azure Environment Variable Names

Description

Standard environment variable names used for Azure credential discovery.

Usage

environment_variables

Format

An object of class list of length 9.

Get Credential Authentication Function

Description

Creates a function that retrieves authentication tokens and formats them as HTTP Authorization headers. This function handles credential discovery and returns a callable method that generates Bearer token headers when invoked.

Usage

get_credential_auth(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  client_secret = NULL,
  use_cache = "disk",
  offline = TRUE,
  chain = default_credential_chain()
)

Arguments

Value

A function that, when called, returns a named list with an Authorization element containing the Bearer token, suitable for use with httr2::req_headers().

See Also

get_token(), get_request_authorizer(), get_token_provider()

Examples

## Not run: 
# Create an authentication function
auth_fn <- get_credential_auth(
  scope = "https://graph.microsoft.com/.default"
)

# Call it to get headers
auth_headers <- auth_fn()

# Use with httr2
req <- httr2::request("https://graph.microsoft.com/v1.0/me") |>
  httr2::req_headers(!!!auth_headers)

## End(Not run)

Get Credential Provider

Description

Discovers and returns an authenticated credential object from a chain of credential providers. This function attempts each credential in the chain until one successfully authenticates, returning the first successful credential object.

Usage

get_credential_provider(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  client_secret = NULL,
  use_cache = "disk",
  offline = TRUE,
  oauth_host = NULL,
  oauth_endpoint = NULL,
  chain = NULL
)

Arguments

Value

A credential object that inherits from the Credential class and has successfully authenticated.

See Also

get_token_provider(), get_request_authorizer(), default_credential_chain()

Examples

## Not run: 
# Get a credential provider with default settings
cred <- get_credential_provider(
  scope = "https://graph.microsoft.com/.default",
  tenant_id = "my-tenant-id"
)

# Use the credential to get a token
token <- cred$get_token()

## End(Not run)

Get Default Request Authorizer Function

Description

Creates a request authorizer function that retrieves authentication credentials and returns a callable request authorization method. This function handles the credential discovery process and returns the request authentication method from the discovered credential object.

Usage

get_request_authorizer(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  client_secret = NULL,
  use_cache = "disk",
  offline = TRUE,
  chain = default_credential_chain()
)

Arguments

Value

A function that authorizes HTTP requests with appropriate credentials when called.

See Also

get_token_provider(), get_token()

Examples

# In non-interactive sessions, this function will return an error if the
# environment is not setup with valid credentials. And in an interactive session
# the user will be prompted to attempt one of the interactive authentication flows.
## Not run: 
req_auth <- get_request_authorizer(
  scope = "https://graph.microsoft.com/.default"
)
req <- req_auth(httr2::request("https://graph.microsoft.com/v1.0/me"))

## End(Not run)

Get Authentication Token

Description

Retrieves an authentication token using the default token provider. This is a convenience function that combines credential discovery and token acquisition in a single step.

Usage

get_token(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  client_secret = NULL,
  use_cache = "disk",
  offline = TRUE,
  chain = default_credential_chain()
)

Arguments

Value

An httr2::oauth_token() object.

See Also

get_token_provider(), get_request_authorizer()

Examples

# In non-interactive sessions, this function will return an error if the
# environment is not setup with valid credentials. And in an interactive session
# the user will be prompted to attempt one of the interactive authentication flows.
## Not run: 
token <- get_token(
  scope = "https://graph.microsoft.com/.default",
  tenant_id = "my-tenant-id",
  client_id = "my-client-id",
  client_secret = "my-secret"
)

## End(Not run)

Get Default Token Provider Function

Description

Creates a token provider function that retrieves authentication credentials and returns a callable token getter. This function handles the credential discovery process and returns the token acquisition method from the discovered credential object.

Usage

get_token_provider(
  scope = NULL,
  tenant_id = NULL,
  client_id = NULL,
  client_secret = NULL,
  use_cache = "disk",
  offline = TRUE,
  chain = default_credential_chain()
)

Arguments

Value

A function that retrieves and returns an authentication token when called.

See Also

get_request_authorizer(), get_token()

Examples

# In non-interactive sessions, this function will return an error if the
# environment is not set up with valid credentials. In an interactive session
# the user will be prompted to attempt one of the interactive authentication flows.
## Not run: 
token_provider <- get_token_provider(
  scope = "https://graph.microsoft.com/.default",
  tenant_id = "my-tenant-id",
  client_id = "my-client-id",
  client_secret = "my-secret"
)
token <- token_provider()

## End(Not run)

Detect if running in a hosted session

Description

Determines whether the current R session is running in a hosted environment such as Google Colab or RStudio Server (non-localhost).

Usage

is_hosted_session()

Details

This function checks for:

• Google Colab: presence of the COLAB_RELEASE_TAG environment variable

• RStudio Server: RSTUDIO_PROGRAM_MODE is "server" and RSTUDIO_HTTP_REFERER does not contain "localhost"

Value

A logical value: TRUE if running in a hosted session (Google Colab or remote RStudio Server), FALSE otherwise.

Examples

if (is_hosted_session()) {
  message("Running in a hosted environment")
}