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Add OpenID Connect Support for Slack Apps #1381

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Merged
atymic merged 1 commit into from
Aug 26, 2025
Merged

Add OpenID Connect Support for Slack Apps #1381

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80 changes: 67 additions & 13 deletions src/Slack/Provider.php
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Original file line number Diff line number Diff line change
Expand Up @@ -39,8 +39,12 @@ protected function getCodeFields($state = null)
{
$fields = parent::getCodeFields($state);

$fields['user_scope'] = $this->formatScopes($this->userScopes, $this->scopeSeparator);
$fields['scope'] = $this->formatScopes($this->scopes, $this->scopeSeparator);
if ($this->shouldUseOpenIdConnect()) {
$fields['scope'] = $this->formatScopes($this->userScopes, ' ');
} else {
$fields['user_scope'] = $this->formatScopes($this->userScopes, $this->scopeSeparator);
$fields['scope'] = $this->formatScopes($this->scopes, $this->scopeSeparator);
}

return $fields;
}
Expand All @@ -57,7 +61,13 @@ public function user()

$response = $this->getAccessTokenResponse($this->getCode());

$user = $this->getUserByToken(Arr::get($response, 'authed_user.access_token'));
if ($this->shouldUseOpenIdConnect()) {
$token = Arr::get($response, 'access_token');
} else {
$token = Arr::get($response, 'authed_user.access_token');
}

$user = $this->getUserByToken($token);

/** @var User $userInstance */
$userInstance = $this->userInstance($response, $user);
Expand All @@ -68,13 +78,25 @@ public function user()

protected function mapUserToObject(array $user)
{
return (new User)->setRaw($user)->map([
'id' => Arr::get($user, 'user.id'),
'name' => Arr::get($user, 'user.name'),
'email' => Arr::get($user, 'user.email'),
'avatar' => Arr::get($user, 'user.image_512'),
'organization_id' => Arr::get($user, 'team.id'),
]);
if ($this->usesOpenIdScopes()) {
$attributes = [
'id' => Arr::get($user, 'sub'),
'name' => Arr::get($user, 'name'),
'email' => Arr::get($user, 'email'),
'avatar' => Arr::get($user, 'picture'),
'organization_id' => Arr::get($user, 'https://slack.com/team_id'),
];
} else {
$attributes = [
'id' => Arr::get($user, 'user.id'),
'name' => Arr::get($user, 'user.name'),
'email' => Arr::get($user, 'user.email'),
'avatar' => Arr::get($user, 'user.image_512'),
'organization_id' => Arr::get($user, 'team.id'),
];
}

return (new User)->setRaw($user)->map($attributes);
}

public function getAccessTokenResponse($code)
Expand All @@ -87,13 +109,23 @@ public function getAccessTokenResponse($code)
return json_decode((string) $response->getBody(), true);
}

public function getAuthUrl($state)
public function getAuthUrl($state): string
{
return $this->buildAuthUrlFromBase('https://slack.com/oauth/v2/authorize', $state);
if ($this->shouldUseOpenIdConnect()) {
$url = 'https://slack.com/openid/connect/authorize';
} else {
$url = 'https://slack.com/oauth/v2/authorize';
}

return $this->buildAuthUrlFromBase($url, $state);
}

protected function getTokenUrl(): string
{
if ($this->shouldUseOpenIdConnect()) {
return 'https://slack.com/api/openid.connect.token';
}

return 'https://slack.com/api/oauth.v2.access';
}

Expand All @@ -102,10 +134,32 @@ protected function getTokenUrl(): string
*/
protected function getUserByToken($token)
{
$response = $this->getHttpClient()->get('https://slack.com/api/users.identity', [
if ($this->usesOpenIdScopes()) {
$url = 'https://slack.com/api/openid.connect.userInfo';
} else {
$url = 'https://slack.com/api/users.identity';
}

$response = $this->getHttpClient()->get($url, [
RequestOptions::HEADERS => ['Authorization' => 'Bearer '.$token],
]);

return json_decode((string) $response->getBody(), true);
}

protected function shouldUseOpenIdConnect(): bool
{
return $this->usesOpenIdScopes() && empty($this->scopes);
}

protected function usesOpenIdScopes(): bool
{
$openidScopes = ['openid', 'email', 'profile'];
$identityScopes = ['identity.basic', 'identity.email', 'identity.team', 'identity.avatar'];

$hasOpenIdScopes = ! empty(array_intersect($this->userScopes, $openidScopes));
$hasIdentityScopes = ! empty(array_intersect($this->userScopes, $identityScopes));

return $hasOpenIdScopes && ! $hasIdentityScopes;
}
}
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