feat(secret-sync): Add gitlab secret sync

backend/src/lib/api-docs/constants.ts

@@ -2228,6 +2228,11 @@ export const AppConnections = {
     },
     FLYIO: {
       accessToken: "The Access Token used to access fly.io."
+    },
+    GITLAB: {
+      instanceUrl: "The GitLab instance URL to connect with.",
+      accessToken: "The Access Token used to access GitLab.",
+      code: "The OAuth code to use to connect with GitLab."
     }
   }
 };
@@ -2401,6 +2406,16 @@ export const SecretSyncs = {
     },
     FLYIO: {
       appId: "The ID of the Fly.io app to sync secrets to."
+    },
+    GITLAB: {
+      projectId: "The GitLab project to sync secrets to.",
+      projectName: "The GitLab project name to sync secrets to.",
+      groupId: "The GitLab group to sync secrets to.",
+      scope: "The GitLab project scope that secrets should be synced to. (default: individual)",
+      targetEnvironment: "The GitLab environment scope that secrets should be synced to. (default: *)",
+      shouldProtectSecrets: "Whether variables should be protected",
+      shouldMaskSecrets: "Whether variables should be masked in logs",
+      shouldHideSecrets: "Whether variables should be hidden"
     }
   }
 };

backend/src/server/routes/v1/app-connection-routers/app-connection-router.ts

@@ -46,6 +46,7 @@ import {
   GitHubRadarConnectionListItemSchema,
   SanitizedGitHubRadarConnectionSchema
 } from "@app/services/app-connection/github-radar";
+import { GitLabConnectionListItemSchema, SanitizedGitLabConnectionSchema } from "@app/services/app-connection/gitlab";
 import {
   HCVaultConnectionListItemSchema,
   SanitizedHCVaultConnectionSchema
@@ -109,7 +110,8 @@ const SanitizedAppConnectionSchema = z.union([
   ...SanitizedOnePassConnectionSchema.options,
   ...SanitizedHerokuConnectionSchema.options,
   ...SanitizedRenderConnectionSchema.options,
-  ...SanitizedFlyioConnectionSchema.options
+  ...SanitizedFlyioConnectionSchema.options,
+  ...SanitizedGitLabConnectionSchema.options
 ]);
 
 const AppConnectionOptionsSchema = z.discriminatedUnion("app", [
@@ -139,7 +141,8 @@ const AppConnectionOptionsSchema = z.discriminatedUnion("app", [
   OnePassConnectionListItemSchema,
   HerokuConnectionListItemSchema,
   RenderConnectionListItemSchema,
-  FlyioConnectionListItemSchema
+  FlyioConnectionListItemSchema,
+  GitLabConnectionListItemSchema
 ]);
 
 export const registerAppConnectionRouter = async (server: FastifyZodProvider) => {

backend/src/server/routes/v1/app-connection-routers/gitlab-connection-router.ts

@@ -0,0 +1,94 @@
+import z from "zod";
+
+import { readLimit } from "@app/server/config/rateLimiter";
+import { verifyAuth } from "@app/server/plugins/auth/verify-auth";
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import {
+  CreateGitLabConnectionSchema,
+  SanitizedGitLabConnectionSchema,
+  TGitLabGroup,
+  TGitLabProject,
+  UpdateGitLabConnectionSchema
+} from "@app/services/app-connection/gitlab";
+import { AuthMode } from "@app/services/auth/auth-type";
+
+import { registerAppConnectionEndpoints } from "./app-connection-endpoints";
+
+export const registerGitLabConnectionRouter = async (server: FastifyZodProvider) => {
+  registerAppConnectionEndpoints({
+    app: AppConnection.GitLab,
+    server,
+    sanitizedResponseSchema: SanitizedGitLabConnectionSchema,
+    createSchema: CreateGitLabConnectionSchema,
+    updateSchema: UpdateGitLabConnectionSchema
+  });
+
+  // The below endpoints are not exposed and for Infisical App use
+  server.route({
+    method: "GET",
+    url: `/:connectionId/projects`,
+    config: {
+      rateLimit: readLimit
+    },
+    schema: {
+      params: z.object({
+        connectionId: z.string().uuid()
+      }),
+      querystring: z.object({
+        group: z.string().optional()
+      }),
+      response: {
+        200: z
+          .object({
+            id: z.string(),
+            name: z.string()
+          })
+          .array()
+      }
+    },
+    onRequest: verifyAuth([AuthMode.JWT]),
+    handler: async (req) => {
+      const { connectionId } = req.params;
+
+      const projects: TGitLabProject[] = await server.services.appConnection.gitlab.listProjects(
+        connectionId,
+        req.permission,
+        req.query.group
+      );
+
+      return projects;
+    }
+  });
+
+  server.route({
+    method: "GET",
+    url: `/:connectionId/groups`,
+    config: {
+      rateLimit: readLimit
+    },
+    schema: {
+      params: z.object({
+        connectionId: z.string().uuid()
+      }),
+      response: {
+        200: z
+          .object({
+            id: z.string(),
+            name: z.string()
+          })
+          .array()
+      }
+    },
+    onRequest: verifyAuth([AuthMode.JWT]),
+    handler: async (req) => {
+      const { connectionId } = req.params;
+
+      const groups: TGitLabGroup[] = await server.services.appConnection.gitlab.listGroups(
+        connectionId,
+        req.permission
+      );
+
+      return groups;
+    }
+  });
+};

backend/src/server/routes/v1/app-connection-routers/index.ts

@@ -15,6 +15,7 @@ import { registerFlyioConnectionRouter } from "./flyio-connection-router";
 import { registerGcpConnectionRouter } from "./gcp-connection-router";
 import { registerGitHubConnectionRouter } from "./github-connection-router";
 import { registerGitHubRadarConnectionRouter } from "./github-radar-connection-router";
+import { registerGitLabConnectionRouter } from "./gitlab-connection-router";
 import { registerHCVaultConnectionRouter } from "./hc-vault-connection-router";
 import { registerHerokuConnectionRouter } from "./heroku-connection-router";
 import { registerHumanitecConnectionRouter } from "./humanitec-connection-router";
@@ -58,5 +59,6 @@ export const APP_CONNECTION_REGISTER_ROUTER_MAP: Record<AppConnection, (server:
     [AppConnection.OnePass]: registerOnePassConnectionRouter,
     [AppConnection.Heroku]: registerHerokuConnectionRouter,
     [AppConnection.Render]: registerRenderConnectionRouter,
-    [AppConnection.Flyio]: registerFlyioConnectionRouter
+    [AppConnection.Flyio]: registerFlyioConnectionRouter,
+    [AppConnection.GitLab]: registerGitLabConnectionRouter
   };

backend/src/server/routes/v1/secret-sync-routers/gitlab-sync-router.ts

@@ -0,0 +1,13 @@
+import { CreateGitLabSyncSchema, GitLabSyncSchema, UpdateGitLabSyncSchema } from "@app/services/secret-sync/gitlab";
+import { SecretSync } from "@app/services/secret-sync/secret-sync-enums";
+
+import { registerSyncSecretsEndpoints } from "./secret-sync-endpoints";
+
+export const registerGitLabSyncRouter = async (server: FastifyZodProvider) =>
+  registerSyncSecretsEndpoints({
+    destination: SecretSync.GitLab,
+    server,
+    responseSchema: GitLabSyncSchema,
+    createSchema: CreateGitLabSyncSchema,
+    updateSchema: UpdateGitLabSyncSchema
+  });

backend/src/server/routes/v1/secret-sync-routers/index.ts

@@ -12,6 +12,7 @@ import { registerDatabricksSyncRouter } from "./databricks-sync-router";
 import { registerFlyioSyncRouter } from "./flyio-sync-router";
 import { registerGcpSyncRouter } from "./gcp-sync-router";
 import { registerGitHubSyncRouter } from "./github-sync-router";
+import { registerGitLabSyncRouter } from "./gitlab-sync-router";
 import { registerHCVaultSyncRouter } from "./hc-vault-sync-router";
 import { registerHerokuSyncRouter } from "./heroku-sync-router";
 import { registerHumanitecSyncRouter } from "./humanitec-sync-router";
@@ -43,5 +44,6 @@ export const SECRET_SYNC_REGISTER_ROUTER_MAP: Record<SecretSync, (server: Fastif
   [SecretSync.OnePass]: registerOnePassSyncRouter,
   [SecretSync.Heroku]: registerHerokuSyncRouter,
   [SecretSync.Render]: registerRenderSyncRouter,
-  [SecretSync.Flyio]: registerFlyioSyncRouter
+  [SecretSync.Flyio]: registerFlyioSyncRouter,
+  [SecretSync.GitLab]: registerGitLabSyncRouter
 };

backend/src/server/routes/v1/secret-sync-routers/secret-sync-router.ts

@@ -26,6 +26,7 @@ import { DatabricksSyncListItemSchema, DatabricksSyncSchema } from "@app/service
 import { FlyioSyncListItemSchema, FlyioSyncSchema } from "@app/services/secret-sync/flyio";
 import { GcpSyncListItemSchema, GcpSyncSchema } from "@app/services/secret-sync/gcp";
 import { GitHubSyncListItemSchema, GitHubSyncSchema } from "@app/services/secret-sync/github";
+import { GitLabSyncListItemSchema, GitLabSyncSchema } from "@app/services/secret-sync/gitlab";
 import { HCVaultSyncListItemSchema, HCVaultSyncSchema } from "@app/services/secret-sync/hc-vault";
 import { HerokuSyncListItemSchema, HerokuSyncSchema } from "@app/services/secret-sync/heroku";
 import { HumanitecSyncListItemSchema, HumanitecSyncSchema } from "@app/services/secret-sync/humanitec";
@@ -55,7 +56,8 @@ const SecretSyncSchema = z.discriminatedUnion("destination", [
   OnePassSyncSchema,
   HerokuSyncSchema,
   RenderSyncSchema,
-  FlyioSyncSchema
+  FlyioSyncSchema,
+  GitLabSyncSchema
 ]);
 
 const SecretSyncOptionsSchema = z.discriminatedUnion("destination", [
@@ -78,7 +80,8 @@ const SecretSyncOptionsSchema = z.discriminatedUnion("destination", [
   OnePassSyncListItemSchema,
   HerokuSyncListItemSchema,
   RenderSyncListItemSchema,
-  FlyioSyncListItemSchema
+  FlyioSyncListItemSchema,
+  GitLabSyncListItemSchema
 ]);
 
 export const registerSecretSyncRouter = async (server: FastifyZodProvider) => {

backend/src/services/app-connection/app-connection-enums.ts

@@ -25,7 +25,8 @@ export enum AppConnection {
   OnePass = "1password",
   Heroku = "heroku",
   Render = "render",
-  Flyio = "flyio"
+  Flyio = "flyio",
+  GitLab = "gitlab"
 }
 
 export enum AWSRegion {

backend/src/services/app-connection/app-connection-fns.ts

@@ -64,6 +64,7 @@ import {
   GitHubRadarConnectionMethod,
   validateGitHubRadarConnectionCredentials
 } from "./github-radar";
+import { getGitLabConnectionListItem, GitLabConnectionMethod, validateGitLabConnectionCredentials } from "./gitlab";
 import {
   getHCVaultConnectionListItem,
   HCVaultConnectionMethod,
@@ -128,7 +129,8 @@ export const listAppConnectionOptions = () => {
     getOnePassConnectionListItem(),
     getHerokuConnectionListItem(),
     getRenderConnectionListItem(),
-    getFlyioConnectionListItem()
+    getFlyioConnectionListItem(),
+    getGitLabConnectionListItem()
   ].sort((a, b) => a.name.localeCompare(b.name));
 };
 
@@ -206,7 +208,8 @@ export const validateAppConnectionCredentials = async (
     [AppConnection.OnePass]: validateOnePassConnectionCredentials as TAppConnectionCredentialsValidator,
     [AppConnection.Heroku]: validateHerokuConnectionCredentials as TAppConnectionCredentialsValidator,
     [AppConnection.Render]: validateRenderConnectionCredentials as TAppConnectionCredentialsValidator,
-    [AppConnection.Flyio]: validateFlyioConnectionCredentials as TAppConnectionCredentialsValidator
+    [AppConnection.Flyio]: validateFlyioConnectionCredentials as TAppConnectionCredentialsValidator,
+    [AppConnection.GitLab]: validateGitLabConnectionCredentials as TAppConnectionCredentialsValidator
   };
 
   return VALIDATE_APP_CONNECTION_CREDENTIALS_MAP[appConnection.app](appConnection);
@@ -223,6 +226,7 @@ export const getAppConnectionMethodName = (method: TAppConnection["method"]) =>
     case GitHubConnectionMethod.OAuth:
     case AzureDevOpsConnectionMethod.OAuth:
     case HerokuConnectionMethod.OAuth:
+    case GitLabConnectionMethod.OAuth:
       return "OAuth";
     case HerokuConnectionMethod.AuthToken:
       return "Auth Token";
@@ -318,7 +322,8 @@ export const TRANSITION_CONNECTION_CREDENTIALS_TO_PLATFORM: Record<
   [AppConnection.OnePass]: platformManagedCredentialsNotSupported,
   [AppConnection.Heroku]: platformManagedCredentialsNotSupported,
   [AppConnection.Render]: platformManagedCredentialsNotSupported,
-  [AppConnection.Flyio]: platformManagedCredentialsNotSupported
+  [AppConnection.Flyio]: platformManagedCredentialsNotSupported,
+  [AppConnection.GitLab]: platformManagedCredentialsNotSupported
 };
 
 export const enterpriseAppCheck = async (

backend/src/services/app-connection/app-connection-maps.ts

@@ -27,7 +27,8 @@ export const APP_CONNECTION_NAME_MAP: Record<AppConnection, string> = {
   [AppConnection.OnePass]: "1Password",
   [AppConnection.Heroku]: "Heroku",
   [AppConnection.Render]: "Render",
-  [AppConnection.Flyio]: "Fly.io"
+  [AppConnection.Flyio]: "Fly.io",
+  [AppConnection.GitLab]: "GitLab"
 };
 
 export const APP_CONNECTION_PLAN_MAP: Record<AppConnection, AppConnectionPlanType> = {
@@ -57,5 +58,6 @@ export const APP_CONNECTION_PLAN_MAP: Record<AppConnection, AppConnectionPlanTyp
   [AppConnection.MySql]: AppConnectionPlanType.Regular,
   [AppConnection.Heroku]: AppConnectionPlanType.Regular,
   [AppConnection.Render]: AppConnectionPlanType.Regular,
-  [AppConnection.Flyio]: AppConnectionPlanType.Regular
+  [AppConnection.Flyio]: AppConnectionPlanType.Regular,
+  [AppConnection.GitLab]: AppConnectionPlanType.Regular
 };

backend/src/services/app-connection/app-connection-service.ts

@@ -56,6 +56,8 @@ import { gcpConnectionService } from "./gcp/gcp-connection-service";
 import { ValidateGitHubConnectionCredentialsSchema } from "./github";
 import { githubConnectionService } from "./github/github-connection-service";
 import { ValidateGitHubRadarConnectionCredentialsSchema } from "./github-radar";
+import { ValidateGitLabConnectionCredentialsSchema } from "./gitlab";
+import { gitlabConnectionService } from "./gitlab/gitlab-connection-service";
 import { ValidateHCVaultConnectionCredentialsSchema } from "./hc-vault";
 import { hcVaultConnectionService } from "./hc-vault/hc-vault-connection-service";
 import { ValidateHerokuConnectionCredentialsSchema } from "./heroku";
@@ -113,7 +115,8 @@ const VALIDATE_APP_CONNECTION_CREDENTIALS_MAP: Record<AppConnection, TValidateAp
   [AppConnection.OnePass]: ValidateOnePassConnectionCredentialsSchema,
   [AppConnection.Heroku]: ValidateHerokuConnectionCredentialsSchema,
   [AppConnection.Render]: ValidateRenderConnectionCredentialsSchema,
-  [AppConnection.Flyio]: ValidateFlyioConnectionCredentialsSchema
+  [AppConnection.Flyio]: ValidateFlyioConnectionCredentialsSchema,
+  [AppConnection.GitLab]: ValidateGitLabConnectionCredentialsSchema
 };
 
 export const appConnectionServiceFactory = ({
@@ -521,6 +524,7 @@ export const appConnectionServiceFactory = ({
     onepass: onePassConnectionService(connectAppConnectionById),
     heroku: herokuConnectionService(connectAppConnectionById, appConnectionDAL, kmsService),
     render: renderConnectionService(connectAppConnectionById),
-    flyio: flyioConnectionService(connectAppConnectionById)
+    flyio: flyioConnectionService(connectAppConnectionById),
+    gitlab: gitlabConnectionService(connectAppConnectionById, appConnectionDAL, kmsService)
   };
 };

backend/src/services/app-connection/app-connection-types.ts

@@ -92,6 +92,12 @@ import {
   TGitHubRadarConnectionInput,
   TValidateGitHubRadarConnectionCredentialsSchema
 } from "./github-radar";
+import {
+  TGitLabConnection,
+  TGitLabConnectionConfig,
+  TGitLabConnectionInput,
+  TValidateGitLabConnectionCredentialsSchema
+} from "./gitlab";
 import {
   THCVaultConnection,
   THCVaultConnectionConfig,
@@ -182,6 +188,7 @@ export type TAppConnection = { id: string } & (
   | THerokuConnection
   | TRenderConnection
   | TFlyioConnection
+  | TGitLabConnection
 );
 
 export type TAppConnectionRaw = NonNullable<Awaited<ReturnType<TAppConnectionDALFactory["findById"]>>>;
@@ -216,6 +223,7 @@ export type TAppConnectionInput = { id: string } & (
   | THerokuConnectionInput
   | TRenderConnectionInput
   | TFlyioConnectionInput
+  | TGitLabConnectionInput
 );
 
 export type TSqlConnectionInput =
@@ -257,7 +265,8 @@ export type TAppConnectionConfig =
   | TOnePassConnectionConfig
   | THerokuConnectionConfig
   | TRenderConnectionConfig
-  | TFlyioConnectionConfig;
+  | TFlyioConnectionConfig
+  | TGitLabConnectionConfig;
 
 export type TValidateAppConnectionCredentialsSchema =
   | TValidateAwsConnectionCredentialsSchema
@@ -286,7 +295,8 @@ export type TValidateAppConnectionCredentialsSchema =
   | TValidateOnePassConnectionCredentialsSchema
   | TValidateHerokuConnectionCredentialsSchema
   | TValidateRenderConnectionCredentialsSchema
-  | TValidateFlyioConnectionCredentialsSchema;
+  | TValidateFlyioConnectionCredentialsSchema
+  | TValidateGitLabConnectionCredentialsSchema;
 
 export type TListAwsConnectionKmsKeys = {
   connectionId: string;

backend/src/services/app-connection/gitlab/gitlab-connection-enums.ts

@@ -0,0 +1,4 @@
+export enum GitLabConnectionMethod {
+  OAuth = "oauth",
+  AccessToken = "access-token"
+}

backend/src/services/app-connection/gitlab/gitlab-connection-fns.ts

@@ -0,0 +1,510 @@
+/* eslint-disable no-await-in-loop */
+import { AxiosError, AxiosResponse } from "axios";
+
+import { getConfig } from "@app/lib/config/env";
+import { request } from "@app/lib/config/request";
+import { BadRequestError, InternalServerError } from "@app/lib/errors";
+import { logger } from "@app/lib/logger";
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import { encryptAppConnectionCredentials } from "@app/services/app-connection/app-connection-fns";
+import { IntegrationUrls } from "@app/services/integration-auth/integration-list";
+import { TKmsServiceFactory } from "@app/services/kms/kms-service";
+
+import { TAppConnectionDALFactory } from "../app-connection-dal";
+import { GitLabConnectionMethod } from "./gitlab-connection-enums";
+import { TGitLabConnection, TGitLabConnectionConfig, TGitLabGroup, TGitLabProject } from "./gitlab-connection-types";
+
+interface GitLabOAuthTokenResponse {
+  access_token: string;
+  token_type: string;
+  expires_in: number;
+  refresh_token: string;
+  created_at: number;
+  scope?: string;
+}
+
+export const getGitLabConnectionListItem = () => {
+  const { CLIENT_ID_GITLAB_LOGIN } = getConfig();
+
+  return {
+    name: "GitLab" as const,
+    app: AppConnection.GitLab as const,
+    methods: Object.values(GitLabConnectionMethod) as [
+      GitLabConnectionMethod.AccessToken,
+      GitLabConnectionMethod.OAuth
+    ],
+    oauthClientId: CLIENT_ID_GITLAB_LOGIN
+  };
+};
+
+export const refreshGitLabToken = async (
+  refreshToken: string,
+  appId: string,
+  orgId: string,
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">,
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">,
+  instanceUrl?: string
+): Promise<string> => {
+  const { CLIENT_ID_GITLAB_LOGIN, CLIENT_SECRET_GITLAB_LOGIN, SITE_URL } = getConfig();
+  if (!CLIENT_SECRET_GITLAB_LOGIN || !CLIENT_ID_GITLAB_LOGIN || !SITE_URL) {
+    throw new InternalServerError({
+      message: `GitLab environment variables have not been configured`
+    });
+  }
+
+  const payload = new URLSearchParams({
+    grant_type: "refresh_token",
+    refresh_token: refreshToken,
+    client_id: CLIENT_ID_GITLAB_LOGIN,
+    client_secret: CLIENT_SECRET_GITLAB_LOGIN,
+    redirect_uri: `${SITE_URL}/integrations/gitlab/oauth2/callback`
+  });
+
+  try {
+    const { data } = await request.post<GitLabOAuthTokenResponse>(
+      `${instanceUrl ? `${instanceUrl}/oauth/token` : IntegrationUrls.GITLAB_TOKEN_URL}`,
+      payload.toString(),
+      {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+          Accept: "application/json"
+        }
+      }
+    );
+
+    const expiresAt = new Date(Date.now() + data.expires_in * 1000 - 60000);
+
+    const encryptedCredentials = await encryptAppConnectionCredentials({
+      credentials: {
+        refreshToken: data.refresh_token,
+        accessToken: data.access_token,
+        expiresAt
+      },
+      orgId,
+      kmsService
+    });
+
+    await appConnectionDAL.updateById(appId, { encryptedCredentials });
+
+    return data.access_token;
+  } catch (error: unknown) {
+    if (error instanceof AxiosError) {
+      throw new BadRequestError({
+        message: `Failed to refresh GitLab token: ${error.message}`
+      });
+    }
+    throw new BadRequestError({
+      message: "Unable to refresh GitLab token"
+    });
+  }
+};
+
+export const exchangeGitLabOAuthCode = async (
+  code: string,
+  instanceUrl?: string
+): Promise<GitLabOAuthTokenResponse> => {
+  const { CLIENT_ID_GITLAB_LOGIN, CLIENT_SECRET_GITLAB_LOGIN, SITE_URL } = getConfig();
+  if (!CLIENT_SECRET_GITLAB_LOGIN || !CLIENT_ID_GITLAB_LOGIN || !SITE_URL) {
+    throw new InternalServerError({
+      message: `GitLab environment variables have not been configured`
+    });
+  }
+
+  try {
+    const payload = new URLSearchParams({
+      grant_type: "authorization_code",
+      code,
+      client_id: CLIENT_ID_GITLAB_LOGIN,
+      client_secret: CLIENT_SECRET_GITLAB_LOGIN,
+      redirect_uri: `${SITE_URL}/integrations/gitlab/oauth2/callback`
+    });
+
+    const response = await request.post<GitLabOAuthTokenResponse>(
+      instanceUrl ? `${instanceUrl}/oauth/token` : IntegrationUrls.GITLAB_TOKEN_URL,
+      payload.toString(),
+      {
+        headers: {
+          "Content-Type": "application/x-www-form-urlencoded",
+          Accept: "application/json"
+        }
+      }
+    );
+
+    if (!response.data) {
+      throw new InternalServerError({
+        message: "Failed to exchange OAuth code: Empty response"
+      });
+    }
+
+    return response.data;
+  } catch (error: unknown) {
+    if (error instanceof AxiosError) {
+      throw new BadRequestError({
+        message: `Failed to exchange OAuth code: ${error.message}`
+      });
+    }
+    throw new BadRequestError({
+      message: "Unable to exchange OAuth code"
+    });
+  }
+};
+
+export const validateGitLabConnectionCredentials = async (config: TGitLabConnectionConfig) => {
+  const { credentials: inputCredentials, method } = config;
+
+  let accessToken: string;
+  let oauthData: GitLabOAuthTokenResponse | null = null;
+
+  if (method === GitLabConnectionMethod.OAuth && "code" in inputCredentials) {
+    oauthData = await exchangeGitLabOAuthCode(inputCredentials.code, inputCredentials.instanceUrl);
+    accessToken = oauthData.access_token;
+  } else if (method === GitLabConnectionMethod.AccessToken && "accessToken" in inputCredentials) {
+    accessToken = inputCredentials.accessToken;
+  } else {
+    throw new BadRequestError({
+      message: "Invalid credentials for the selected connection method"
+    });
+  }
+
+  let response: AxiosResponse<TGitLabProject[]> | null = null;
+
+  try {
+    response = await request.get<TGitLabProject[]>(
+      `${inputCredentials.instanceUrl ? `${inputCredentials.instanceUrl}/api` : IntegrationUrls.GITLAB_API_URL}/v4/groups`,
+      {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+          Accept: "application/json"
+        }
+      }
+    );
+  } catch (error: unknown) {
+    if (error instanceof AxiosError) {
+      throw new BadRequestError({
+        message: `Failed to validate credentials: ${error.message}`
+      });
+    }
+    throw new BadRequestError({
+      message: "Unable to validate connection: verify credentials"
+    });
+  }
+
+  if (!response?.data) {
+    throw new InternalServerError({
+      message: "Failed to validate credentials: Response was empty"
+    });
+  }
+
+  if (method === GitLabConnectionMethod.OAuth && oauthData) {
+    return {
+      accessToken,
+      refreshToken: oauthData.refresh_token,
+      expiresAt: new Date(Date.now() + oauthData.expires_in * 1000 - 60000),
+      tokenType: oauthData.token_type,
+      createdAt: new Date(oauthData.created_at * 1000)
+    };
+  }
+
+  return inputCredentials;
+};
+
+export const listGitLabProjects = async ({
+  appConnection,
+  appConnectionDAL,
+  kmsService,
+  teamId
+}: {
+  appConnection: TGitLabConnection;
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">;
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">;
+  teamId?: string;
+}): Promise<TGitLabProject[]> => {
+  let { accessToken } = appConnection.credentials;
+
+  if (
+    appConnection.method === GitLabConnectionMethod.OAuth &&
+    appConnection.credentials.refreshToken &&
+    appConnection.credentials.expiresAt < new Date()
+  ) {
+    accessToken = await refreshGitLabToken(
+      appConnection.credentials.refreshToken,
+      appConnection.id,
+      appConnection.orgId,
+      appConnectionDAL,
+      kmsService,
+      appConnection.credentials.instanceUrl
+    );
+  }
+
+  const gitLabApiUrl = appConnection.credentials.instanceUrl
+    ? `${appConnection.credentials.instanceUrl}/api/v4`
+    : `${IntegrationUrls.GITLAB_API_URL}/v4`;
+
+  const projects: TGitLabProject[] = [];
+  let page = 1;
+  const perPage = 100;
+  let hasMorePages = true;
+
+  try {
+    if (teamId) {
+      while (hasMorePages) {
+        const { data } = await request.get<TGitLabProject[]>(`${gitLabApiUrl}/groups/${teamId}/projects`, {
+          headers: {
+            Authorization: `Bearer ${accessToken}`,
+            Accept: "application/json"
+          },
+          params: {
+            page: page.toString(),
+            per_page: perPage.toString(),
+            order_by: "updated_at",
+            sort: "desc",
+            include_subgroups: "true"
+          }
+        });
+
+        if (!data) {
+          throw new InternalServerError({
+            message: "Failed to get group projects: Response was empty"
+          });
+        }
+
+        data.forEach((project) => {
+          projects.push({
+            name: project.name,
+            id: project.id.toString()
+          });
+        });
+
+        hasMorePages = data.length === perPage;
+        page += 1;
+      }
+    } else {
+      const { data: userData } = await request.get<{ id: string }>(`${gitLabApiUrl}/user`, {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+          Accept: "application/json"
+        }
+      });
+
+      if (!userData?.id) {
+        throw new InternalServerError({
+          message: "Failed to get current user information"
+        });
+      }
+
+      while (hasMorePages) {
+        const { data } = await request.get<TGitLabProject[]>(`${gitLabApiUrl}/users/${userData.id}/projects`, {
+          headers: {
+            Authorization: `Bearer ${accessToken}`,
+            Accept: "application/json"
+          },
+          params: {
+            page: page.toString(),
+            per_page: perPage.toString(),
+            order_by: "updated_at",
+            sort: "desc"
+          }
+        });
+
+        if (!data) {
+          throw new InternalServerError({
+            message: "Failed to get user projects: Response was empty"
+          });
+        }
+
+        data.forEach((project) => {
+          projects.push({
+            name: project.name,
+            id: project.id.toString()
+          });
+        });
+
+        hasMorePages = data.length === perPage;
+        page += 1;
+      }
+
+      if (projects.length === 0 && appConnection.method === GitLabConnectionMethod.AccessToken) {
+        try {
+          const { data: tokenAssociations } = await request.get<{
+            projects?: TGitLabProject[];
+            groups?: Array<{ projects?: TGitLabProject[] }>;
+          }>(`${gitLabApiUrl}/personal_access_tokens/self/associations`, {
+            headers: {
+              Authorization: `Bearer ${accessToken}`,
+              Accept: "application/json"
+            },
+            params: {
+              min_access_level: "50"
+            }
+          });
+
+          if (tokenAssociations?.projects) {
+            tokenAssociations.projects.forEach((project) => {
+              projects.push({
+                name: project.name,
+                id: project.id.toString()
+              });
+            });
+          }
+
+          if (tokenAssociations?.groups) {
+            tokenAssociations.groups.forEach((group) => {
+              if (group.projects) {
+                group.projects.forEach((project) => {
+                  const existingProject = projects.find((p) => p.id === project.id.toString());
+                  if (!existingProject) {
+                    projects.push({
+                      name: project.name,
+                      id: project.id.toString()
+                    });
+                  }
+                });
+              }
+            });
+          }
+        } catch (error) {
+          logger.warn(error, "Failed to fetch projects via personal access token associations:");
+        }
+      }
+    }
+
+    return projects;
+  } catch (error: unknown) {
+    if (error instanceof AxiosError) {
+      const status = error.response?.status;
+      const { message } = error;
+
+      if (status === 401) {
+        throw new BadRequestError({
+          message: `GitLab authentication failed: ${message}`
+        });
+      } else if (status === 403) {
+        throw new BadRequestError({
+          message: `GitLab access forbidden: ${message}`
+        });
+      } else if (status === 404) {
+        throw new BadRequestError({
+          message: teamId ? `GitLab group not found or access denied: ${message}` : `GitLab user not found: ${message}`
+        });
+      } else {
+        throw new BadRequestError({
+          message: `Failed to fetch GitLab projects: ${message}`
+        });
+      }
+    }
+
+    if (error instanceof InternalServerError) {
+      throw error;
+    }
+
+    throw new InternalServerError({
+      message: "Unable to fetch GitLab projects"
+    });
+  }
+};
+
+export const listGitLabGroups = async ({
+  appConnection,
+  appConnectionDAL,
+  kmsService,
+  includeSubgroups = true,
+  owned = false
+}: {
+  appConnection: TGitLabConnection;
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">;
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">;
+  includeSubgroups?: boolean;
+  owned?: boolean;
+}): Promise<TGitLabGroup[]> => {
+  let { accessToken } = appConnection.credentials;
+
+  if (
+    appConnection.method === GitLabConnectionMethod.OAuth &&
+    appConnection.credentials.refreshToken &&
+    appConnection.credentials.expiresAt < new Date()
+  ) {
+    accessToken = await refreshGitLabToken(
+      appConnection.credentials.refreshToken,
+      appConnection.id,
+      appConnection.orgId,
+      appConnectionDAL,
+      kmsService,
+      appConnection.credentials.instanceUrl
+    );
+  }
+
+  const gitLabApiUrl = appConnection.credentials.instanceUrl
+    ? `${appConnection.credentials.instanceUrl}/api/v4`
+    : `${IntegrationUrls.GITLAB_API_URL}/v4`;
+
+  const groups: TGitLabGroup[] = [];
+  let page = 1;
+  const perPage = 100;
+  let hasMorePages = true;
+
+  try {
+    while (hasMorePages) {
+      const { data } = await request.get<TGitLabGroup[]>(`${gitLabApiUrl}/groups`, {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+          Accept: "application/json"
+        },
+        params: {
+          page: page.toString(),
+          per_page: perPage.toString(),
+          order_by: "name",
+          sort: "asc",
+          all_available: (!owned).toString(),
+          owned: owned.toString(),
+          min_access_level: "10",
+          ...(includeSubgroups && { with_custom_attributes: "true" })
+        }
+      });
+
+      if (!data) {
+        throw new InternalServerError({
+          message: "Failed to get groups: Response was empty"
+        });
+      }
+
+      data.forEach((group) => {
+        groups.push({
+          id: group.id.toString(),
+          name: group.name
+        });
+      });
+
+      hasMorePages = data.length === perPage;
+      page += 1;
+    }
+
+    return groups;
+  } catch (error: unknown) {
+    if (error instanceof AxiosError) {
+      const status = error.response?.status;
+      const { message } = error;
+
+      if (status === 401) {
+        throw new BadRequestError({
+          message: `GitLab authentication failed: ${message}`
+        });
+      } else if (status === 403) {
+        throw new BadRequestError({
+          message: `GitLab access forbidden: ${message}`
+        });
+      } else {
+        throw new BadRequestError({
+          message: `Failed to fetch GitLab groups: ${message}`
+        });
+      }
+    }
+
+    if (error instanceof InternalServerError) {
+      throw error;
+    }
+
+    throw new InternalServerError({
+      message: "Unable to fetch GitLab groups"
+    });
+  }
+};

backend/src/services/app-connection/gitlab/gitlab-connection-schemas.ts

@@ -0,0 +1,139 @@
+import z from "zod";
+
+import { AppConnections } from "@app/lib/api-docs";
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import {
+  BaseAppConnectionSchema,
+  GenericCreateAppConnectionFieldsSchema,
+  GenericUpdateAppConnectionFieldsSchema
+} from "@app/services/app-connection/app-connection-schemas";
+
+import { GitLabConnectionMethod } from "./gitlab-connection-enums";
+
+// Fixed: Use consistent accessToken naming throughout
+export const GitLabConnectionAccessTokenCredentialsSchema = z.object({
+  accessToken: z
+    .string()
+    .trim()
+    .min(1, "Access Token required")
+    .describe(AppConnections.CREDENTIALS.GITLAB.accessToken),
+  instanceUrl: z
+    .string()
+    .trim()
+    .url("Invalid Instance URL")
+    .optional()
+    .describe(AppConnections.CREDENTIALS.GITLAB.instanceUrl)
+});
+
+export const GitLabConnectionOAuthCredentialsSchema = z.object({
+  code: z.string().trim().min(1, "OAuth code required").describe(AppConnections.CREDENTIALS.GITLAB.code),
+  instanceUrl: z
+    .string()
+    .trim()
+    .url("Invalid Instance URL")
+    .optional()
+    .describe(AppConnections.CREDENTIALS.GITLAB.instanceUrl)
+});
+
+// Fixed: Updated schema to match GitLab's actual OAuth response structure
+export const GitLabConnectionOAuthOutputCredentialsSchema = z.object({
+  accessToken: z.string().trim(),
+  refreshToken: z.string().trim(),
+  expiresAt: z.date(),
+  tokenType: z.string().optional().default("bearer"),
+  createdAt: z.string().optional(),
+  instanceUrl: z
+    .string()
+    .trim()
+    .url("Invalid Instance URL")
+    .optional()
+    .describe(AppConnections.CREDENTIALS.GITLAB.instanceUrl)
+});
+
+// Schema for refresh token input during initial setup
+export const GitLabConnectionRefreshTokenCredentialsSchema = z.object({
+  refreshToken: z.string().trim().min(1, "Refresh token required"),
+  instanceUrl: z
+    .string()
+    .trim()
+    .url("Invalid Instance URL")
+    .optional()
+    .describe(AppConnections.CREDENTIALS.GITLAB.instanceUrl)
+});
+
+const BaseGitLabConnectionSchema = BaseAppConnectionSchema.extend({
+  app: z.literal(AppConnection.GitLab)
+});
+
+export const GitLabConnectionSchema = z.intersection(
+  BaseGitLabConnectionSchema,
+  z.discriminatedUnion("method", [
+    z.object({
+      method: z.literal(GitLabConnectionMethod.AccessToken),
+      credentials: GitLabConnectionAccessTokenCredentialsSchema
+    }),
+    z.object({
+      method: z.literal(GitLabConnectionMethod.OAuth),
+      credentials: GitLabConnectionOAuthOutputCredentialsSchema
+    })
+  ])
+);
+
+export const SanitizedGitLabConnectionSchema = z.discriminatedUnion("method", [
+  BaseGitLabConnectionSchema.extend({
+    method: z.literal(GitLabConnectionMethod.AccessToken),
+    credentials: GitLabConnectionAccessTokenCredentialsSchema.pick({
+      instanceUrl: true
+    }) // Don't expose sensitive data
+  }),
+  BaseGitLabConnectionSchema.extend({
+    method: z.literal(GitLabConnectionMethod.OAuth),
+    credentials: GitLabConnectionOAuthOutputCredentialsSchema.pick({
+      instanceUrl: true
+    })
+  })
+]);
+
+export const ValidateGitLabConnectionCredentialsSchema = z.discriminatedUnion("method", [
+  z.object({
+    method: z.literal(GitLabConnectionMethod.AccessToken).describe(AppConnections.CREATE(AppConnection.GitLab).method),
+    credentials: GitLabConnectionAccessTokenCredentialsSchema.describe(
+      AppConnections.CREATE(AppConnection.GitLab).credentials
+    )
+  }),
+  z.object({
+    method: z.literal(GitLabConnectionMethod.OAuth).describe(AppConnections.CREATE(AppConnection.GitLab).method),
+    credentials: z
+      .union([
+        GitLabConnectionOAuthCredentialsSchema,
+        GitLabConnectionRefreshTokenCredentialsSchema,
+        GitLabConnectionOAuthOutputCredentialsSchema
+      ])
+      .describe(AppConnections.CREATE(AppConnection.GitLab).credentials)
+  })
+]);
+
+export const CreateGitLabConnectionSchema = ValidateGitLabConnectionCredentialsSchema.and(
+  GenericCreateAppConnectionFieldsSchema(AppConnection.GitLab)
+);
+
+export const UpdateGitLabConnectionSchema = z
+  .object({
+    credentials: z
+      .union([
+        GitLabConnectionAccessTokenCredentialsSchema,
+        GitLabConnectionOAuthOutputCredentialsSchema,
+        GitLabConnectionRefreshTokenCredentialsSchema,
+        GitLabConnectionOAuthCredentialsSchema
+      ])
+      .optional()
+      .describe(AppConnections.UPDATE(AppConnection.GitLab).credentials)
+  })
+  .and(GenericUpdateAppConnectionFieldsSchema(AppConnection.GitLab));
+
+export const GitLabConnectionListItemSchema = z.object({
+  name: z.literal("GitLab"),
+  app: z.literal(AppConnection.GitLab),
+  methods: z.nativeEnum(GitLabConnectionMethod).array(),
+  oauthClientId: z.string().optional()
+});

backend/src/services/app-connection/gitlab/gitlab-connection-service.ts

@@ -0,0 +1,47 @@
+import { logger } from "@app/lib/logger";
+import { OrgServiceActor } from "@app/lib/types";
+import { TKmsServiceFactory } from "@app/services/kms/kms-service";
+
+import { TAppConnectionDALFactory } from "../app-connection-dal";
+import { AppConnection } from "../app-connection-enums";
+import { listGitLabGroups, listGitLabProjects } from "./gitlab-connection-fns";
+import { TGitLabConnection } from "./gitlab-connection-types";
+
+type TGetAppConnectionFunc = (
+  app: AppConnection,
+  connectionId: string,
+  actor: OrgServiceActor
+) => Promise<TGitLabConnection>;
+
+export const gitlabConnectionService = (
+  getAppConnection: TGetAppConnectionFunc,
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">,
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">
+) => {
+  const listProjects = async (connectionId: string, actor: OrgServiceActor, teamId?: string) => {
+    try {
+      const appConnection = await getAppConnection(AppConnection.GitLab, connectionId, actor);
+      const projects = await listGitLabProjects({ appConnection, appConnectionDAL, kmsService, teamId });
+      return projects;
+    } catch (error) {
+      logger.error(error, `Failed to establish connection with GitLab for app ${connectionId}`);
+      return [];
+    }
+  };
+
+  const listGroups = async (connectionId: string, actor: OrgServiceActor) => {
+    try {
+      const appConnection = await getAppConnection(AppConnection.GitLab, connectionId, actor);
+      const groups = await listGitLabGroups({ appConnection, appConnectionDAL, kmsService });
+      return groups;
+    } catch (error) {
+      logger.error(error, `Failed to establish connection with GitLab for app ${connectionId}`);
+      return [];
+    }
+  };
+
+  return {
+    listProjects,
+    listGroups
+  };
+};

backend/src/services/app-connection/gitlab/gitlab-connection-types.ts

@@ -0,0 +1,56 @@
+import z from "zod";
+
+import { DiscriminativePick } from "@app/lib/types";
+
+import { AppConnection } from "../app-connection-enums";
+import {
+  CreateGitLabConnectionSchema,
+  GitLabConnectionSchema,
+  ValidateGitLabConnectionCredentialsSchema
+} from "./gitlab-connection-schemas";
+
+export type TGitLabConnection = z.infer<typeof GitLabConnectionSchema>;
+
+export type TGitLabConnectionInput = z.infer<typeof CreateGitLabConnectionSchema> & {
+  app: AppConnection.GitLab;
+};
+
+export type TValidateGitLabConnectionCredentialsSchema = typeof ValidateGitLabConnectionCredentialsSchema;
+
+export type TGitLabConnectionConfig = DiscriminativePick<TGitLabConnectionInput, "method" | "app" | "credentials"> & {
+  orgId: string;
+};
+
+export type TGitLabProject = {
+  name: string;
+  id: string;
+};
+
+export type TGitLabAccessTokenCredentials = {
+  accessToken: string;
+  instanceUrl: string;
+};
+
+export type TGitLabOAuthCredentials = {
+  accessToken: string;
+  refreshToken: string;
+  expiresAt: Date;
+  tokenType?: string;
+  createdAt?: Date;
+  instanceUrl: string;
+};
+
+export type TGitLabOAuthCodeCredentials = {
+  code: string;
+  instanceUrl: string;
+};
+
+export type TGitLabRefreshTokenCredentials = {
+  refreshToken: string;
+  instanceUrl: string;
+};
+
+export interface TGitLabGroup {
+  id: string;
+  name: string;
+}

backend/src/services/app-connection/gitlab/index.ts

@@ -0,0 +1,4 @@
+export * from "./gitlab-connection-enums";
+export * from "./gitlab-connection-fns";
+export * from "./gitlab-connection-schemas";
+export * from "./gitlab-connection-types";

backend/src/services/secret-sync/gitlab/gitlab-sync-constants.ts

@@ -0,0 +1,10 @@
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import { SecretSync } from "@app/services/secret-sync/secret-sync-enums";
+import { TSecretSyncListItem } from "@app/services/secret-sync/secret-sync-types";
+
+export const GITLAB_SYNC_LIST_OPTION: TSecretSyncListItem = {
+  name: "GitLab",
+  destination: SecretSync.GitLab,
+  connection: AppConnection.GitLab,
+  canImportSecrets: false
+};

backend/src/services/secret-sync/gitlab/gitlab-sync-enums.ts

@@ -0,0 +1,4 @@
+export enum GitLabSyncScope {
+  Individual = "individual",
+  Group = "group"
+}

backend/src/services/secret-sync/gitlab/gitlab-sync-fns.ts

@@ -0,0 +1,369 @@
+/* eslint-disable no-await-in-loop */
+import { request } from "@app/lib/config/request";
+import { TAppConnectionDALFactory } from "@app/services/app-connection/app-connection-dal";
+import { GitLabConnectionMethod, refreshGitLabToken, TGitLabConnection } from "@app/services/app-connection/gitlab";
+import { IntegrationUrls } from "@app/services/integration-auth/integration-list";
+import { TKmsServiceFactory } from "@app/services/kms/kms-service";
+import { TGitLabSyncWithCredentials, TGitLabVariable } from "@app/services/secret-sync/gitlab/gitlab-sync-types";
+import { SecretSyncError } from "@app/services/secret-sync/secret-sync-errors";
+import { matchesSchema } from "@app/services/secret-sync/secret-sync-fns";
+import { TSecretMap } from "@app/services/secret-sync/secret-sync-types";
+
+import { SECRET_SYNC_NAME_MAP } from "../secret-sync-maps";
+
+interface TGitLabVariablePayload {
+  key?: string;
+  value: string;
+  variable_type?: "env_var" | "file";
+  environment_scope?: string;
+  protected?: boolean;
+  masked?: boolean;
+  masked_and_hidden?: boolean;
+  description?: string;
+}
+
+interface TGitLabVariableCreate extends TGitLabVariablePayload {
+  key: string;
+}
+
+interface TGitLabVariableUpdate extends Omit<TGitLabVariablePayload, "key"> {}
+
+type TGitLabSyncFactoryDeps = {
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">;
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">;
+};
+
+const getValidAccessToken = async (
+  connection: TGitLabConnection,
+  appConnectionDAL: Pick<TAppConnectionDALFactory, "updateById">,
+  kmsService: Pick<TKmsServiceFactory, "createCipherPairWithDataKey">
+): Promise<string> => {
+  if (
+    connection.method === GitLabConnectionMethod.OAuth &&
+    connection.credentials.refreshToken &&
+    connection.credentials.expiresAt < new Date()
+  ) {
+    const accessToken = await refreshGitLabToken(
+      connection.credentials.refreshToken,
+      connection.id,
+      connection.orgId,
+      appConnectionDAL,
+      kmsService
+    );
+    return accessToken;
+  }
+  return connection.credentials.accessToken;
+};
+
+const getGitLabApiUrl = (connection: TGitLabConnection): string => {
+  const baseUrl = connection.credentials.instanceUrl || IntegrationUrls.GITLAB_API_URL;
+  return baseUrl.includes("/api") ? baseUrl : `${baseUrl}/api`;
+};
+
+const buildVariablesEndpoint = (apiUrl: string, projectId: string): string => {
+  return `${apiUrl}/v4/projects/${encodeURIComponent(projectId)}/variables`;
+};
+
+const getGitLabVariables = async ({
+  accessToken,
+  connection,
+  projectId,
+  targetEnvironment
+}: {
+  accessToken: string;
+  connection: TGitLabConnection;
+  projectId: string;
+  targetEnvironment?: string;
+}): Promise<TGitLabVariable[]> => {
+  try {
+    const apiUrl = getGitLabApiUrl(connection);
+    const baseEndpoint = buildVariablesEndpoint(apiUrl, projectId);
+
+    const headers = {
+      Authorization: `Bearer ${accessToken}`,
+      "Accept-Encoding": "application/json",
+      "Content-Type": "application/json"
+    };
+
+    let allVariables: TGitLabVariable[] = [];
+    let url: string | null = `${baseEndpoint}?per_page=100`;
+
+    if (targetEnvironment) {
+      url += `&filter[environment_scope]=${encodeURIComponent(targetEnvironment)}`;
+    }
+
+    while (url) {
+      const response = await request.get<TGitLabVariable[]>(url, { headers });
+      allVariables = [...allVariables, ...(response.data || [])];
+
+      const linkHeader = response.headers.link as string;
+      const nextLink = linkHeader?.split(",").find((part: string) => part.includes('rel="next"'));
+
+      if (nextLink) {
+        url = nextLink.trim().split(";")[0].slice(1, -1);
+      } else {
+        url = null;
+      }
+    }
+
+    if (targetEnvironment) {
+      return allVariables.filter((variable) => variable.environment_scope === targetEnvironment);
+    }
+
+    return allVariables;
+  } catch (error) {
+    throw new SecretSyncError({
+      error,
+      secretKey: "list_variables"
+    });
+  }
+};
+
+const createGitLabVariable = async ({
+  accessToken,
+  connection,
+  projectId,
+  variable
+}: {
+  accessToken: string;
+  connection: TGitLabConnection;
+  projectId: string;
+  variable: TGitLabVariableCreate;
+}): Promise<void> => {
+  try {
+    const apiUrl = getGitLabApiUrl(connection);
+    const endpoint = buildVariablesEndpoint(apiUrl, projectId);
+
+    const payload = {
+      key: variable.key,
+      value: variable.value,
+      variable_type: variable.variable_type || "env_var",
+      environment_scope: variable.environment_scope || "*",
+      protected: variable.protected || false,
+      masked: variable.masked || false,
+      masked_and_hidden: variable.masked_and_hidden || false,
+      raw: false,
+      ...(variable.description && { description: variable.description })
+    };
+
+    await request.post(endpoint, payload, {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        "Accept-Encoding": "application/json",
+        "Content-Type": "application/json"
+      }
+    });
+  } catch (error) {
+    throw new SecretSyncError({
+      error,
+      secretKey: variable.key
+    });
+  }
+};
+
+const updateGitLabVariable = async ({
+  accessToken,
+  connection,
+  projectId,
+  key,
+  variable,
+  targetEnvironment
+}: {
+  accessToken: string;
+  connection: TGitLabConnection;
+  projectId: string;
+  key: string;
+  variable: TGitLabVariableUpdate;
+  targetEnvironment?: string;
+}): Promise<void> => {
+  try {
+    const apiUrl = getGitLabApiUrl(connection);
+    const baseEndpoint = buildVariablesEndpoint(apiUrl, projectId);
+    let url = `${baseEndpoint}/${encodeURIComponent(key)}`;
+
+    if (targetEnvironment) {
+      url += `?filter[environment_scope]=${encodeURIComponent(targetEnvironment)}`;
+    }
+
+    const payload = {
+      value: variable.value,
+      ...(variable.variable_type && { variable_type: variable.variable_type }),
+      ...(variable.environment_scope && { environment_scope: variable.environment_scope }),
+      ...(variable.protected !== undefined && { protected: variable.protected }),
+      ...(variable.masked !== undefined && { masked: variable.masked }),
+      ...(variable.masked_and_hidden !== undefined && { masked_and_hidden: variable.masked_and_hidden }),
+      ...(variable.description !== undefined && { description: variable.description || "" })
+    };
+
+    await request.put(url, payload, {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        "Accept-Encoding": "application/json",
+        "Content-Type": "application/json"
+      }
+    });
+  } catch (error) {
+    throw new SecretSyncError({
+      error,
+      secretKey: key
+    });
+  }
+};
+
+const deleteGitLabVariable = async ({
+  accessToken,
+  connection,
+  projectId,
+  key,
+  targetEnvironment
+}: {
+  accessToken: string;
+  connection: TGitLabConnection;
+  projectId: string;
+  key: string;
+  targetEnvironment?: string;
+}): Promise<void> => {
+  try {
+    const apiUrl = getGitLabApiUrl(connection);
+    const baseEndpoint = buildVariablesEndpoint(apiUrl, projectId);
+    let url = `${baseEndpoint}/${encodeURIComponent(key)}`;
+
+    if (targetEnvironment) {
+      url += `?filter[environment_scope]=${encodeURIComponent(targetEnvironment)}`;
+    }
+
+    await request.delete(url, {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        "Accept-Encoding": "application/json",
+        "Content-Type": "application/json"
+      }
+    });
+  } catch (error: unknown) {
+    throw new SecretSyncError({
+      error
+    });
+  }
+};
+
+export const GitLabSyncFns = {
+  syncSecrets: async (
+    secretSync: TGitLabSyncWithCredentials,
+    secretMap: TSecretMap,
+    { appConnectionDAL, kmsService }: TGitLabSyncFactoryDeps
+  ): Promise<void> => {
+    const { connection, environment, destinationConfig } = secretSync;
+
+    const { projectId, targetEnvironment } = destinationConfig;
+
+    const accessToken = await getValidAccessToken(connection, appConnectionDAL, kmsService);
+
+    try {
+      const currentVariables = await getGitLabVariables({
+        accessToken,
+        connection,
+        projectId,
+        targetEnvironment
+      });
+
+      const currentVariableMap = new Map(currentVariables.map((v) => [v.key, v]));
+
+      for (const [key, { value }] of Object.entries(secretMap)) {
+        const existingVariable = currentVariableMap.get(key);
+
+        if (existingVariable) {
+          if (existingVariable.value !== value) {
+            await updateGitLabVariable({
+              accessToken,
+              connection,
+              projectId,
+              key,
+              variable: {
+                value,
+                variable_type: existingVariable.variable_type,
+                environment_scope: targetEnvironment || existingVariable.environment_scope,
+                protected: destinationConfig.shouldProtectSecrets ?? existingVariable.protected,
+                ...(!existingVariable.masked && destinationConfig.shouldMaskSecrets && { masked: value?.length > 8 }),
+                ...(!existingVariable.hidden &&
+                  destinationConfig.shouldHideSecrets && { masked_and_hidden: value?.length > 8 }),
+                description: existingVariable.description ?? undefined
+              },
+              targetEnvironment
+            });
+          }
+        } else {
+          await createGitLabVariable({
+            accessToken,
+            connection,
+            projectId,
+            variable: {
+              key,
+              value,
+              variable_type: "env_var",
+              environment_scope: targetEnvironment || "*",
+              protected: destinationConfig.shouldProtectSecrets || false,
+              masked: value?.length > 8 ? destinationConfig.shouldMaskSecrets || false : false,
+              masked_and_hidden: value?.length > 8 ? destinationConfig.shouldHideSecrets || false : false
+            }
+          });
+        }
+      }
+
+      if (!secretSync.syncOptions.disableSecretDeletion) {
+        for (const variable of currentVariables) {
+          const shouldDelete =
+            matchesSchema(variable.key, environment?.slug || "", secretSync.syncOptions.keySchema) &&
+            !(variable.key in secretMap);
+
+          if (shouldDelete) {
+            await deleteGitLabVariable({
+              accessToken,
+              connection,
+              projectId,
+              key: variable.key,
+              targetEnvironment
+            });
+          }
+        }
+      }
+    } catch (error) {
+      throw new SecretSyncError({
+        error,
+        secretKey: "batch_sync"
+      });
+    }
+  },
+
+  removeSecrets: async (
+    secretSync: TGitLabSyncWithCredentials,
+    secretMap: TSecretMap,
+    { appConnectionDAL, kmsService }: TGitLabSyncFactoryDeps
+  ): Promise<void> => {
+    const { connection, destinationConfig } = secretSync;
+
+    const { projectId, targetEnvironment } = destinationConfig;
+
+    const accessToken = await getValidAccessToken(connection, appConnectionDAL, kmsService);
+
+    try {
+      for (const key of Object.keys(secretMap)) {
+        await deleteGitLabVariable({
+          accessToken,
+          connection,
+          projectId,
+          key,
+          targetEnvironment
+        });
+      }
+    } catch (error) {
+      throw new SecretSyncError({
+        error,
+        secretKey: "batch_remove"
+      });
+    }
+  },
+
+  getSecrets: async (secretSync: TGitLabSyncWithCredentials): Promise<TSecretMap> => {
+    throw new Error(`${SECRET_SYNC_NAME_MAP[secretSync.destination]} does not support importing secrets.`);
+  }
+};

backend/src/services/secret-sync/gitlab/gitlab-sync-schemas.ts

@@ -0,0 +1,101 @@
+import { z } from "zod";
+
+import { SecretSyncs } from "@app/lib/api-docs";
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import { SecretSync } from "@app/services/secret-sync/secret-sync-enums";
+import {
+  BaseSecretSyncSchema,
+  GenericCreateSecretSyncFieldsSchema,
+  GenericUpdateSecretSyncFieldsSchema
+} from "@app/services/secret-sync/secret-sync-schemas";
+import { TSyncOptionsConfig } from "@app/services/secret-sync/secret-sync-types";
+
+import { GitLabSyncScope } from "./gitlab-sync-enums";
+
+const GitLabSyncDestinationConfigSchema = z.discriminatedUnion("scope", [
+  z.object({
+    scope: z.literal(GitLabSyncScope.Individual).describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.scope),
+    projectId: z.string().min(1, "Project ID is required").describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.projectId),
+    projectName: z
+      .string()
+      .min(1, "Project name is required")
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.projectName),
+    targetEnvironment: z
+      .string()
+      .optional()
+      .default("*")
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.targetEnvironment),
+    shouldProtectSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldProtectSecrets),
+    shouldMaskSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldMaskSecrets),
+    shouldHideSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldHideSecrets)
+  }),
+  z.object({
+    scope: z.literal(GitLabSyncScope.Group).describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.scope),
+    groupId: z.string().min(1, "Group ID is required").describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.groupId),
+    projectId: z.string().min(1, "Project ID is required").describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.projectId),
+    projectName: z
+      .string()
+      .min(1, "Project name is required")
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.projectName),
+    targetEnvironment: z
+      .string()
+      .optional()
+      .default("*")
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.targetEnvironment),
+    shouldProtectSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldProtectSecrets),
+    shouldMaskSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldMaskSecrets),
+    shouldHideSecrets: z
+      .boolean()
+      .optional()
+      .default(false)
+      .describe(SecretSyncs.DESTINATION_CONFIG.GITLAB.shouldHideSecrets)
+  })
+]);
+
+const GitLabSyncOptionsConfig: TSyncOptionsConfig = { canImportSecrets: false };
+
+export const GitLabSyncSchema = BaseSecretSyncSchema(SecretSync.GitLab, GitLabSyncOptionsConfig).extend({
+  destination: z.literal(SecretSync.GitLab),
+  destinationConfig: GitLabSyncDestinationConfigSchema
+});
+
+export const CreateGitLabSyncSchema = GenericCreateSecretSyncFieldsSchema(
+  SecretSync.GitLab,
+  GitLabSyncOptionsConfig
+).extend({
+  destinationConfig: GitLabSyncDestinationConfigSchema
+});
+
+export const UpdateGitLabSyncSchema = GenericUpdateSecretSyncFieldsSchema(
+  SecretSync.GitLab,
+  GitLabSyncOptionsConfig
+).extend({
+  destinationConfig: GitLabSyncDestinationConfigSchema.optional()
+});
+
+export const GitLabSyncListItemSchema = z.object({
+  name: z.literal("GitLab"),
+  connection: z.literal(AppConnection.GitLab),
+  destination: z.literal(SecretSync.GitLab),
+  canImportSecrets: z.literal(false)
+});

backend/src/services/secret-sync/gitlab/gitlab-sync-types.ts

@@ -0,0 +1,64 @@
+import { z } from "zod";
+
+import { TGitLabConnection } from "@app/services/app-connection/gitlab";
+
+import { CreateGitLabSyncSchema, GitLabSyncListItemSchema, GitLabSyncSchema } from "./gitlab-sync-schemas";
+
+export type TGitLabSync = z.infer<typeof GitLabSyncSchema>;
+export type TGitLabSyncInput = z.infer<typeof CreateGitLabSyncSchema>;
+export type TGitLabSyncListItem = z.infer<typeof GitLabSyncListItemSchema>;
+
+export type TGitLabSyncWithCredentials = TGitLabSync & {
+  connection: TGitLabConnection;
+};
+
+// GitLab CI/CD Variable structure based on API documentation
+export type TGitLabVariable = {
+  key: string;
+  value: string;
+  variable_type: "env_var" | "file";
+  protected: boolean;
+  masked: boolean;
+  hidden: boolean;
+  raw: boolean;
+  environment_scope: string;
+  description: string | null;
+};
+
+// Type for creating a new variable
+export type TGitLabVariableCreate = {
+  key: string;
+  value: string;
+  variable_type?: "env_var" | "file";
+  protected?: boolean;
+  masked?: boolean;
+  raw?: boolean;
+  environment_scope?: string;
+  description?: string;
+};
+
+// Type for updating an existing variable
+export type TGitLabVariableUpdate = {
+  value: string;
+  variable_type?: "env_var" | "file";
+  protected?: boolean;
+  masked?: boolean;
+  raw?: boolean;
+  environment_scope?: string;
+  description?: string | null;
+};
+
+export type TGitLabListVariables = {
+  accessToken: string;
+  projectId: string;
+  environmentScope?: string;
+};
+
+export type TGitLabCreateVariable = TGitLabListVariables & {
+  variable: TGitLabVariableCreate;
+};
+
+export type TGitLabUpdateVariable = TGitLabListVariables & {
+  key: string;
+  variable: TGitLabVariableUpdate;
+};

backend/src/services/secret-sync/gitlab/index.ts

@@ -0,0 +1,4 @@
+export * from "./gitlab-sync-constants";
+export * from "./gitlab-sync-fns";
+export * from "./gitlab-sync-schemas";
+export * from "./gitlab-sync-types";

backend/src/services/secret-sync/secret-sync-enums.ts

@@ -18,7 +18,8 @@ export enum SecretSync {
   OnePass = "1password",
   Heroku = "heroku",
   Render = "render",
-  Flyio = "flyio"
+  Flyio = "flyio",
+  GitLab = "gitlab"
 }
 
 export enum SecretSyncInitialSyncBehavior {

backend/src/services/secret-sync/secret-sync-fns.ts

@@ -32,6 +32,7 @@ import { CAMUNDA_SYNC_LIST_OPTION, camundaSyncFactory } from "./camunda";
 import { FLYIO_SYNC_LIST_OPTION, FlyioSyncFns } from "./flyio";
 import { GCP_SYNC_LIST_OPTION } from "./gcp";
 import { GcpSyncFns } from "./gcp/gcp-sync-fns";
+import { GITLAB_SYNC_LIST_OPTION, GitLabSyncFns } from "./gitlab";
 import { HC_VAULT_SYNC_LIST_OPTION, HCVaultSyncFns } from "./hc-vault";
 import { HEROKU_SYNC_LIST_OPTION, HerokuSyncFns } from "./heroku";
 import { HUMANITEC_SYNC_LIST_OPTION } from "./humanitec";
@@ -63,7 +64,8 @@ const SECRET_SYNC_LIST_OPTIONS: Record<SecretSync, TSecretSyncListItem> = {
   [SecretSync.OnePass]: ONEPASS_SYNC_LIST_OPTION,
   [SecretSync.Heroku]: HEROKU_SYNC_LIST_OPTION,
   [SecretSync.Render]: RENDER_SYNC_LIST_OPTION,
-  [SecretSync.Flyio]: FLYIO_SYNC_LIST_OPTION
+  [SecretSync.Flyio]: FLYIO_SYNC_LIST_OPTION,
+  [SecretSync.GitLab]: GITLAB_SYNC_LIST_OPTION
 };
 
 export const listSecretSyncOptions = () => {
@@ -227,6 +229,8 @@ export const SecretSyncFns = {
         return RenderSyncFns.syncSecrets(secretSync, schemaSecretMap);
       case SecretSync.Flyio:
         return FlyioSyncFns.syncSecrets(secretSync, schemaSecretMap);
+      case SecretSync.GitLab:
+        return GitLabSyncFns.syncSecrets(secretSync, schemaSecretMap, { appConnectionDAL, kmsService });
       default:
         throw new Error(
           `Unhandled sync destination for sync secrets fns: ${(secretSync as TSecretSyncWithCredentials).destination}`
@@ -313,6 +317,9 @@ export const SecretSyncFns = {
       case SecretSync.Flyio:
         secretMap = await FlyioSyncFns.getSecrets(secretSync);
         break;
+      case SecretSync.GitLab:
+        secretMap = await GitLabSyncFns.getSecrets(secretSync);
+        break;
       default:
         throw new Error(
           `Unhandled sync destination for get secrets fns: ${(secretSync as TSecretSyncWithCredentials).destination}`
@@ -386,6 +393,8 @@ export const SecretSyncFns = {
         return RenderSyncFns.removeSecrets(secretSync, schemaSecretMap);
       case SecretSync.Flyio:
         return FlyioSyncFns.removeSecrets(secretSync, schemaSecretMap);
+      case SecretSync.GitLab:
+        return GitLabSyncFns.removeSecrets(secretSync, schemaSecretMap, { appConnectionDAL, kmsService });
       default:
         throw new Error(
           `Unhandled sync destination for remove secrets fns: ${(secretSync as TSecretSyncWithCredentials).destination}`

backend/src/services/secret-sync/secret-sync-maps.ts

@@ -21,7 +21,8 @@ export const SECRET_SYNC_NAME_MAP: Record<SecretSync, string> = {
   [SecretSync.OnePass]: "1Password",
   [SecretSync.Heroku]: "Heroku",
   [SecretSync.Render]: "Render",
-  [SecretSync.Flyio]: "Fly.io"
+  [SecretSync.Flyio]: "Fly.io",
+  [SecretSync.GitLab]: "GitLab"
 };
 
 export const SECRET_SYNC_CONNECTION_MAP: Record<SecretSync, AppConnection> = {
@@ -44,7 +45,8 @@ export const SECRET_SYNC_CONNECTION_MAP: Record<SecretSync, AppConnection> = {
   [SecretSync.OnePass]: AppConnection.OnePass,
   [SecretSync.Heroku]: AppConnection.Heroku,
   [SecretSync.Render]: AppConnection.Render,
-  [SecretSync.Flyio]: AppConnection.Flyio
+  [SecretSync.Flyio]: AppConnection.Flyio,
+  [SecretSync.GitLab]: AppConnection.GitLab
 };
 
 export const SECRET_SYNC_PLAN_MAP: Record<SecretSync, SecretSyncPlanType> = {
@@ -67,5 +69,6 @@ export const SECRET_SYNC_PLAN_MAP: Record<SecretSync, SecretSyncPlanType> = {
   [SecretSync.OnePass]: SecretSyncPlanType.Regular,
   [SecretSync.Heroku]: SecretSyncPlanType.Regular,
   [SecretSync.Render]: SecretSyncPlanType.Regular,
-  [SecretSync.Flyio]: SecretSyncPlanType.Regular
+  [SecretSync.Flyio]: SecretSyncPlanType.Regular,
+  [SecretSync.GitLab]: SecretSyncPlanType.Regular
 };

backend/src/services/secret-sync/secret-sync-types.ts

@@ -74,6 +74,7 @@ import {
 } from "./azure-key-vault";
 import { TFlyioSync, TFlyioSyncInput, TFlyioSyncListItem, TFlyioSyncWithCredentials } from "./flyio/flyio-sync-types";
 import { TGcpSync, TGcpSyncInput, TGcpSyncListItem, TGcpSyncWithCredentials } from "./gcp";
+import { TGitLabSync, TGitLabSyncInput, TGitLabSyncListItem, TGitLabSyncWithCredentials } from "./gitlab";
 import {
   THCVaultSync,
   THCVaultSyncInput,
@@ -127,7 +128,8 @@ export type TSecretSync =
   | TOnePassSync
   | THerokuSync
   | TRenderSync
-  | TFlyioSync;
+  | TFlyioSync
+  | TGitLabSync;
 
 export type TSecretSyncWithCredentials =
   | TAwsParameterStoreSyncWithCredentials
@@ -149,7 +151,8 @@ export type TSecretSyncWithCredentials =
   | TOnePassSyncWithCredentials
   | THerokuSyncWithCredentials
   | TRenderSyncWithCredentials
-  | TFlyioSyncWithCredentials;
+  | TFlyioSyncWithCredentials
+  | TGitLabSyncWithCredentials;
 
 export type TSecretSyncInput =
   | TAwsParameterStoreSyncInput
@@ -171,7 +174,8 @@ export type TSecretSyncInput =
   | TOnePassSyncInput
   | THerokuSyncInput
   | TRenderSyncInput
-  | TFlyioSyncInput;
+  | TFlyioSyncInput
+  | TGitLabSyncInput;
 
 export type TSecretSyncListItem =
   | TAwsParameterStoreSyncListItem
@@ -193,7 +197,8 @@ export type TSecretSyncListItem =
   | TOnePassSyncListItem
   | THerokuSyncListItem
   | TRenderSyncListItem
-  | TFlyioSyncListItem;
+  | TFlyioSyncListItem
+  | TGitLabSyncListItem;
 
 export type TSyncOptionsConfig = {
   canImportSecrets: boolean;