use super::{
OAuthAuthorizationPolicy, OAuthProvider, OAuthTokenEndpointAuth, OAuthUserInfo,
OAuthUserInfoHandler, OAuthUserInfoRequest, OAuthUserInfoResponse,
};
use crate::oauth::{
HttpOAuthJwksSource, OAuthIdTokenConfig, OAuthJwksSelection, OAuthJwksSource,
id_token::OAuthNonceComparison,
};
use async_trait::async_trait;
use base64::Engine;
use serde_json::Map;
use serde_json::Value;
use std::sync::Arc;
#[derive(Clone)]
pub struct FacebookOptions {
pub client_ids: Vec<String>,
pub client_secret: Option<String>,
pub client_key: Option<String>,
pub scope: Vec<String>,
pub disable_default_scope: bool,
pub fields: Vec<String>,
pub config_id: Option<String>,
pub authorization_endpoint: Option<String>,
pub redirect_uri: Option<String>,
pub jwks_source: Option<Arc<dyn OAuthJwksSource>>,
pub token_inspection_endpoint: Option<String>,
pub user_info_endpoint: Option<String>,
pub map_profile_to_user: Option<fn(Value) -> Result<OAuthUserInfo, String>>,
}
impl FacebookOptions {
#[must_use]
pub fn new(client_id: impl Into<String>, client_secret: Option<String>) -> Self {
Self {
client_ids: vec![client_id.into()],
client_secret,
client_key: None,
scope: Vec::new(),
disable_default_scope: false,
fields: Vec::new(),
config_id: None,
authorization_endpoint: None,
redirect_uri: None,
jwks_source: None,
token_inspection_endpoint: None,
user_info_endpoint: None,
map_profile_to_user: None,
}
}
}
impl std::fmt::Debug for FacebookOptions {
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
formatter
.debug_struct("FacebookOptions")
.field("client_ids", &self.client_ids)
.field("scope", &self.scope)
.field("disable_default_scope", &self.disable_default_scope)
.field("fields", &self.fields)
.field("config_id", &self.config_id)
.field("authorization_endpoint", &self.authorization_endpoint)
.field("redirect_uri", &self.redirect_uri)
.finish_non_exhaustive()
}
}
impl OAuthProvider {
#[must_use]
pub fn facebook(client_id: &str, client_secret: &str) -> Self {
Self::facebook_with_options(FacebookOptions::new(client_id, Some(client_secret.into())))
}
#[must_use]
pub fn facebook_with_options(options: FacebookOptions) -> Self {
let client_id = options.client_ids.first().cloned().unwrap_or_default();
let secret = options.client_secret.unwrap_or_default();
let endpoint = options
.user_info_endpoint
.unwrap_or_else(|| "https://graph.facebook.com/me".into());
let verification = OAuthIdTokenConfig {
issuers: vec!["https://www.facebook.com".into()],
audience: None,
client_ids: Some(options.client_ids.clone()),
jwks_source: options.jwks_source.unwrap_or_else(|| {
Arc::new(HttpOAuthJwksSource::new(
"https://limited.facebook.com/.well-known/oauth/openid/jwks/",
))
}),
max_age_secs: None,
allow_opaque_token: true,
algorithm: Some(jsonwebtoken::Algorithm::RS256),
selection: OAuthJwksSelection::RemoteRs256,
nonce_comparison: OAuthNonceComparison::Exact,
verify_claims: None,
};
Self {
client_id: client_id.clone(),
client_secret: secret.clone(),
additional_client_ids: options.client_ids.iter().skip(1).cloned().collect(),
hosted_domain: None,
require_email_verification: false,
auth_url: options
.authorization_endpoint
.filter(|value| !value.is_empty())
.unwrap_or_else(|| "https://www.facebook.com/v24.0/dialog/oauth".into()),
token_url: "https://graph.facebook.com/v24.0/oauth/access_token".into(),
user_info_url: Some(endpoint.clone()),
scopes: vec!["email".into(), "public_profile".into()],
authorization: Some(OAuthAuthorizationPolicy {
configured_scopes: options.scope,
disable_default_scopes: options.disable_default_scope,
require_client_id: true,
require_client_secret: true,
token_endpoint_auth: Some(OAuthTokenEndpointAuth::ClientSecretPost),
authorization_code_client_key: options.client_key,
redirect_uri: options.redirect_uri,
pkce: false,
..OAuthAuthorizationPolicy::default()
}),
allowed_request_params: Vec::new(),
authorization_params: options
.config_id
.filter(|value| !value.is_empty())
.map(|value| vec![("config_id".into(), value)])
.unwrap_or_default(),
account_subject: Some(subject),
map_user_info: None,
get_user_info: Some(Arc::new(FacebookUserInfo {
client_id,
client_ids: options.client_ids,
client_secret: secret,
inspection_endpoint: options
.token_inspection_endpoint
.unwrap_or_else(|| "https://graph.facebook.com/debug_token".into()),
endpoint,
fields: options.fields,
mapper: options.map_profile_to_user,
})),
refresh_access_token: None,
verify_id_token: None,
id_token: Some(verification),
disable_id_token_sign_in: false,
disable_implicit_sign_up: false,
disable_sign_up: false,
allow_idp_initiated: false,
override_user_info_on_sign_in: false,
}
}
}
struct FacebookUserInfo {
client_id: String,
client_ids: Vec<String>,
client_secret: String,
inspection_endpoint: String,
endpoint: String,
fields: Vec<String>,
mapper: Option<fn(Value) -> Result<OAuthUserInfo, String>>,
}
#[async_trait]
impl OAuthUserInfoHandler for FacebookUserInfo {
async fn get_user_info(
&self,
request: OAuthUserInfoRequest,
) -> Result<OAuthUserInfoResponse, String> {
let limited_login = request
.id_token
.as_deref()
.is_some_and(|token| token.split('.').count() == 3);
let profile = if limited_login {
let token = request
.id_token
.as_deref()
.ok_or("Missing Facebook ID token")?;
let payload = token.split('.').nth(1).ok_or("Invalid Facebook ID token")?;
let bytes = base64::engine::general_purpose::URL_SAFE_NO_PAD
.decode(payload)
.map_err(|error| error.to_string())?;
let data: Value =
alibi_core::utils::json::from_slice(&bytes).map_err(|error| error.to_string())?;
if !data.is_object() {
return Err("Invalid Facebook ID profile".into());
}
data
} else {
self.graph_profile(request.access_token.as_deref()).await?
};
let mapped = self
.mapper
.map(|mapper| mapper(profile.clone()))
.transpose()?;
let user_output = mapped.as_ref().map(|user| user.public_profile(true));
let user = match mapped {
Some(user) => user,
None => OAuthUserInfo {
additional_fields: Map::default(),
id: scalar(profile.get("sub").or_else(|| profile.get("id")))?.unwrap_or_default(),
name: scalar(profile.get("name"))?,
email: profile
.get("email")
.and_then(Value::as_str)
.unwrap_or_default()
.into(),
image: scalar(if limited_login {
profile.get("picture")
} else {
profile
.get("picture")
.and_then(|picture| picture.get("data"))
.and_then(|data| data.get("url"))
})?,
email_verified: !limited_login
&& profile
.get("email_verified")
.and_then(Value::as_bool)
.unwrap_or(false),
},
};
Ok(OAuthUserInfoResponse {
user_output,
user,
data: profile,
})
}
}
impl FacebookUserInfo {
async fn graph_profile(&self, access_token: Option<&str>) -> Result<Value, String> {
let access_token = access_token
.filter(|token| !token.is_empty())
.ok_or("Missing Facebook access token")?;
if self.client_id.is_empty() || self.client_secret.is_empty() {
return Err("Facebook client ID and secret are required".into());
}
let client = reqwest::Client::new();
let app_access_token = format!("{}|{}", self.client_id, self.client_secret);
let inspected: Value = client
.get(&self.inspection_endpoint)
.query(&[
("input_token", access_token),
("access_token", app_access_token.as_str()),
])
.send()
.await
.map_err(http_error)?
.error_for_status()
.map_err(http_error)?
.json()
.await
.map_err(http_error)?;
let data = inspected
.get("data")
.ok_or("Facebook inspection returned no data")?;
let app_valid = data
.get("app_id")
.and_then(Value::as_str)
.is_some_and(|id| {
!id.is_empty() && self.client_ids.iter().any(|configured| configured == id)
});
if data.get("is_valid").and_then(Value::as_bool) != Some(true) || !app_valid {
return Err("Invalid Facebook token or configured app binding".into());
}
let user_id = data
.get("user_id")
.filter(|value| {
matches!(value, Value::String(_) | Value::Number(_) | Value::Bool(_))
&& truthy(value)
})
.ok_or("Facebook inspection returned no user")?;
let mut fields = vec!["id", "name", "email", "picture"];
fields.extend(self.fields.iter().map(String::as_str));
let profile: Value = client
.get(&self.endpoint)
.query(&[("fields", fields.join(","))])
.bearer_auth(access_token)
.send()
.await
.map_err(http_error)?
.error_for_status()
.map_err(http_error)?
.json()
.await
.map_err(http_error)?;
if profile.get("id") != Some(user_id) {
return Err("Facebook profile does not match inspected identity".into());
}
Ok(profile)
}
}
fn http_error(error: reqwest::Error) -> String {
error.without_url().to_string()
}
fn truthy(value: &Value) -> bool {
match value {
Value::Null => false,
Value::Bool(value) => *value,
Value::Number(value) => value.as_f64().is_some_and(|value| value != 0.0),
Value::String(value) => !value.is_empty(),
Value::Array(_) | Value::Object(_) => true,
}
}
fn scalar(value: Option<&Value>) -> Result<Option<String>, String> {
match value {
None | Some(Value::Null) => Ok(None),
Some(Value::String(value)) => Ok(Some(value.clone())),
Some(Value::Number(value)) => alibi_core::utils::json::number_to_string(value)
.map(Some)
.map_err(|error| error.to_string()),
Some(Value::Bool(value)) => Ok(Some(value.to_string())),
Some(Value::Array(_) | Value::Object(_)) => Err("Invalid Facebook profile field".into()),
}
}
fn subject(profile: &Value) -> Result<String, String> {
let id = scalar(profile.get("sub").or_else(|| profile.get("id")))?
.ok_or("Missing Facebook account subject")?;
if id
.trim_matches(|character: char| {
(character.is_whitespace() && character != '\u{85}') || character == '\u{feff}'
})
.is_empty()
|| id == "null"
|| id == "undefined"
{
return Err("Invalid Facebook account subject".into());
}
Ok(id)
}