摘要：基礎環境安裝在官方應用商店下載解壓并拷貝至目錄打開并在應用中啟用配置使用管理員賬號打開找到設置，選擇并添加信息，如下設置只使用登錄，取消系統登錄編輯添加以下配置使用注銷使用中發現點擊登出后，只是注銷了本身的，并沒有注銷的，因此會登出失敗打開

Nextcloud 15.0.5

oauth2

在官方app應用商店下載 sociallogin

解壓并拷貝 sociallogin 至 app 目錄

打開 Nextcloud 并在 應用中啟用

使用管理員賬號打開 Nextcloud 找到 sociallogin設置，選擇 Custom OAuth2 并添加oauth2信息，如下

設置只使用oauth2登錄，取消系統登錄
編輯 /var/www/html/config/config.php 添加以下配置：

"social_login_auto_redirect" => true

使用中發現點擊登出后，Nextcloud只是注銷了本身的session，并沒有注銷oauth2的session，因此會登出失敗.
打開 core/Controller/LoginController.php 找到 logout 方法，修改 $response 值如下：

$response = new RedirectResponse("http://10.0.4.3/logout?redirect_uri=http://10.0.4.33:8088");

http://10.0.4.3/logout 為oauth2認證系統登出地址

在使用oauth2登錄成功后，為了與原有Nextcloud用戶區分，Nextcloud會在數據庫中創建一個用戶名為 oauth2 Internal name + 登錄名稱的用戶，這樣使用起來及其不方便，我們可以通過修改以下代碼，保證用戶名正常不帶前綴：

根據返回用戶信息中其他信息創建組

sociallogin/lib/Controller/LoginController.php

private function login($uid, Profile $profile)
{
    $user = $this->userManager->get($uid);
    if (null === $user) {
        $connectedUid = $this->socialConnect->findUID($uid);
        $user = $this->userManager->get($connectedUid);
    }
    if ($this->userSession->isLoggedIn()) {
        if (!$this->config->getAppValue($this->appName, "allow_login_connect")) {
            throw new LoginException($this->l->t("Social login connect is disabled"));
        }
        if (null !== $user) {
            throw new LoginException($this->l->t("This account already connected"));
        }
        $currentUid = $this->userSession->getUser()->getUID();
        $this->socialConnect->connectLogin($currentUid, $uid);
        return new RedirectResponse($this->urlGenerator->linkToRoute("settings.PersonalSettings.index", ["section" => "additional"]));
    }
    if (null === $user) {
        if ($this->config->getAppValue($this->appName, "disable_registration")) {
            throw new LoginException($this->l->t("Auto creating new users is disabled"));
        }
        if (
            $profile->email && $this->config->getAppValue($this->appName, "prevent_create_email_exists")
            && count($this->userManager->getByEmail($profile->email)) !== 0
        ) {
            throw new LoginException($this->l->t("Email already registered"));
        }
        $password = substr(base64_encode(random_bytes(64)), 0, 30);
        $user = $this->userManager->createUser($uid, $password);
        $user->setDisplayName($profile->displayName ?: $profile->identifier);
        $user->setEMailAddress((string)$profile->email);

        $newUserGroup = $this->config->getAppValue($this->appName, "new_user_group");
        if ($newUserGroup) {
            try {
                $group = $this->groupManager->get($newUserGroup);
                $group->addUser($user);
            } catch (Exception $e) {
            }
        }

        if ($profile->photoURL) {
            $curl = new Curl();
            try {
                $photo = $curl->request($profile->photoURL);
                $avatar = $this->avatarManager->getAvatar($uid);
                $avatar->set($photo);
            } catch (Exception $e) {
            }
        }
        $this->config->setUserValue($uid, $this->appName, "disable_password_confirmation", 1);
        if ($profile->data["departmentName"] !== null) {
            $existGroup = $this->groupManager->get($profile->data["departmentName"]);
            if ($existGroup === null) {
                $newGroup = $this->groupManager->createGroup($profile->data["departmentName"]);
                $newGroup->addUser($user);
            } else {
                $existGroup->addUser($user);
            }
        }
    }

    $this->userSession->completeLogin($user, ["loginName" => $user->getUID(), "password" => null]);
    $this->userSession->createSessionToken($this->request, $user->getUID(), $user->getUID());

    if ($redirectUrl = $this->session->get("login_redirect_url")) {
        return new RedirectResponse($redirectUrl);
    }

    $this->session->set("last-password-confirm", time());

    return new RedirectResponse($this->urlGenerator->getAbsoluteURL("/"));
}

sociallogin/lib/Provider/CustomOAuth2.php

public function getUserProfile()
    {
        $profileFields = array_filter(
            array_map("trim", explode(",", $this->config->get("profile_fields"))),
            function ($val) {
                return !empty($val);
            }
        );
        $profileUrl = $this->config->get("endpoints")->get("profile_url");

        if (count($profileFields) > 0) {
            $profileUrl .= (strpos($profileUrl, "?") !== false ? "&" : "?") . "fields=" . implode(",", $profileFields);
        }
        $response = $this->apiRequest($profileUrl);
        if (!isset($response->identifier) && isset($response->id)) {
            $response->identifier = $response->id;
        }
        if (!isset($response->identifier) && isset($response->data->id)) {
            $response->identifier = $response->data->id;
        }
        if (!isset($response->identifier) && isset($response->user_id)) {
            $response->identifier = $response->user_id;
        }
        $data = new DataCollection($response);
        if (!$data->exists("identifier")) {
            throw new UnexpectedApiResponseException("Provider API returned an unexpected response.");
        }
        $userProfile = new UserProfile();
        foreach ($data->toArray() as $key => $value) {
            if (property_exists($userProfile, $key)) {
                $userProfile->$key = $value;
            }
        }
        if (!empty($userProfile->email)) {
            $userProfile->emailVerified = $userProfile->email;
        }
        $attributes = new DataCollection($data->get("attributes"));
        $userProfile->data = [
            "organizationName" => $attributes->get("organizationName"),
            "departmentName" => $attributes->get("departmentName"),
        ];
        if ($attributes->get("name") !== null) {
            $userProfile->displayName = $attributes->get("name");
        }
        return $userProfile;
    }