feat: add cookie-based authentication support for enterprise GitLab (#101)

* feat: add cookie-based authentication support for GitLab instances 🍪

- Add GITLAB_AUTH_COOKIE_PATH environment variable support
- Handle #HttpOnly_ prefix in cookie files properly
- Enable redirect following when cookies are present
- Maintain compatibility with existing token-based auth

* chore: prepare fork for npm publishing as @mattweg/gitlab-mcp

- Update package name to @mattweg/gitlab-mcp
- Bump version to 1.0.63-fork.1
- Add attribution to original author zereight
- Add deprecation notice referencing upstream PR #100
- Add repository and homepage URLs for fork

* fix: remove duplicate documentation line

 - removed the duplicate GITLAB_AUTH_COOKIE_PATH from README.md

* fix: move cookie header outside conditional block for universal auth support

- Move cookie header setting outside if/else block to ensure it applies
  to both old (Private-Token) and new (Bearer) GitLab authentication
- Fixes issue where cookies were only set for Bearer token auth
- Maintains backward compatibility with existing authentication methods
- Enables cookie-based authentication for all GitLab instance types

Resolves authentication failures when using GITLAB_AUTH_COOKIE_PATH
with GitLab instances that require cookie-based authentication.

* 1.0.63

* fix: add support for macOS cookie format in auth cookie parsing 🍪

- Add fallback parsing for macOS cookie format
- Handle cookie files with different structure than standard Netscape format
- Maintain compatibility with existing Linux cookie parsing
- Extract cookie name and value from space-separated format

Resolves authentication failures when using GITLAB_AUTH_COOKIE_PATH on macOS systems.

* 1.0.64

* chore: update version to 1.0.63-fork.3

* fix: implement proper cookie jar authentication for macOS

- Replace static cookie string with fetch-cookie + tough-cookie
- Add proper Netscape cookie format parsing with domain context
- Enable automatic cookie handling during OAuth2 redirects
- Fixes authentication issues on macOS with enterprise SSO

* chore: update version to 1.0.63-fork.4

* feat: add cookie-based authentication support for enterprise GitLab instances

Add support for Netscape cookie file authentication to enable access to
enterprise GitLab instances that use SSO/OAuth2 redirects.

- Add GITLAB_AUTH_COOKIE_PATH environment variable
- Implement cookie jar with proper domain handling for redirects
- Use conditional fetch assignment: cookie-enabled when path configured
- Maintains backward compatibility: no cookies = original behavior
- Zero changes to existing fetch() calls throughout codebase

Enables authentication flows like: curl -L -b ~/.midway/cookie
Useful for enterprise environments with federated authentication.

* chore: update to fork version 1.0.63-fork.5 with cookie auth support

* feat: add cookie-based authentication support for enterprise GitLab instances

Add support for Netscape cookie file authentication to enable access to
enterprise GitLab instances that use SSO/OAuth2 redirects.

- Add GITLAB_AUTH_COOKIE_PATH environment variable
- Implement cookie jar with proper domain handling for redirects
- Use conditional fetch assignment: cookie-enabled when path configured
- Maintains backward compatibility: no cookies = original behavior
- Zero changes to existing fetch() calls throughout codebase

Enables authentication flows like: curl -L -b ~/.midway/cookie
Useful for enterprise environments with federated authentication.

* feat: implement robust cookie-based authentication with hybrid parsing

- Add support for Netscape cookie file format with #HttpOnly_ prefix handling
- Implement hybrid approach using tough-cookie's parse() for robust cookie parsing
- Add automatic session establishment for enterprise GitLab authentication
- Support cookie file path via GITLAB_AUTH_COOKIE_PATH environment variable
- Integrate with fetch-cookie for automatic redirect handling and session persistence
- Ensure compatibility with Midway enterprise authentication flow

This enables seamless authentication with enterprise GitLab instances that require
cookie-based authentication while maintaining clean, maintainable code using
widely-supported packages (tough-cookie + fetch-cookie).

* chore: bump version to 1.0.63-fork.6 with ultra-clean cookie auth

* fix: correct package name to @mattweg/gitlab-mcp for proper npx dependency resolution

- Fix package name mismatch that prevented npx from installing dependencies
- Bump version to 1.0.63-fork.7
- This resolves cookie authentication issues by ensuring fetch-cookie and tough-cookie are properly installed

* Improve cookie authentication with robust session establishment

* feat: add cookie-based authentication support

This feature adds support for cookie-based authentication with GitLab instances by:
- Adding a new GITLAB_AUTH_COOKIE_PATH environment variable to specify the path to a Netscape-format cookie file
- Implementing a cookie jar parser that handles standard Netscape cookie format
- Adding session establishment logic that checks for GitLab session cookies
- Ensuring all API requests use the authenticated session

This allows the MCP server to authenticate with GitLab instances that use cookie-based authentication, which is particularly useful for instances that require SSO or other authentication methods that don't support personal access tokens.

---------

Co-authored-by: Moon (mattweg's AI assistant) <moon+ai-assistant@mattweg.dev>
Co-authored-by: Matt Weg <mattweg@amazon.com>

CHANGELOG.md

@@ -1,3 +1,29 @@
+## [1.0.63] - 2025-06-12
+
+### Added
+
+- 📊 **CI Job Log Pagination**: Added pagination support for CI job logs to prevent context window flooding
+  - `get_pipeline_job_output` now supports optional `limit` and `offset` parameters
+  - Default limit is 1000 lines when pagination is used
+  - Returns lines from the end of the log, with configurable offset
+  - Includes truncation metadata showing what was skipped
+  - Maintains backward compatibility (no parameters = full log)
+  - See: [PR #97](https://github.com/zereight/gitlab-mcp/pull/97)
+
+---
+
+## [1.0.62] - 2025-06-10
+
+### Fixed
+
+- 🔐 **Private Token Authentication Fix**: Fixed Private-Token header authentication for GitLab API
+  - Removed incorrect `Bearer ` prefix from Private-Token header in legacy authentication mode
+  - Fixed authentication issues when using older GitLab instances with private tokens
+  - Ensures proper API authentication for both new and legacy GitLab configurations
+  - See: [PR #91](https://github.com/zereight/gitlab-mcp/pull/91), [Issue #88](https://github.com/zereight/gitlab-mcp/issues/88)
+
+---
+
 ## [1.0.60] - 2025-06-07
 
 ### Added

README.md

@@ -111,6 +111,7 @@ $ sh scripts/image_push.sh docker_user_name
 - `USE_GITLAB_WIKI`: When set to 'true', enables the wiki-related tools (list_wiki_pages, get_wiki_page, create_wiki_page, update_wiki_page, delete_wiki_page). By default, wiki features are disabled.
 - `USE_MILESTONE`: When set to 'true', enables the milestone-related tools (list_milestones, get_milestone, create_milestone, edit_milestone, delete_milestone, get_milestone_issue, get_milestone_merge_requests, promote_milestone, get_milestone_burndown_events). By default, milestone features are disabled.
 - `USE_PIPELINE`: When set to 'true', enables the pipeline-related tools (list_pipelines, get_pipeline, list_pipeline_jobs, get_pipeline_job, get_pipeline_job_output, create_pipeline, retry_pipeline, cancel_pipeline). By default, pipeline features are disabled.
+- `GITLAB_AUTH_COOKIE_PATH`: Path to an authentication cookie file for GitLab instances that require cookie-based authentication. When provided, the cookie will be included in all GitLab API requests.
 
 ## Tools 🛠️
 

RELEASE_NOTES.md

@@ -1,18 +1,11 @@
-## [1.0.60] - 2025-06-07
-
-### Added
-
-- 📄 **Merge Request Enhancement**: Added support for `remove_source_branch` and `squash` options for merge requests
-  - Enhanced merge request functionality with additional configuration options
-  - Allows automatic source branch removal after merge
-  - Supports squash commits for cleaner Git history
-  - See: [PR #86](https://github.com/zereight/gitlab-mcp/pull/86)
+## [1.0.62] - 2025-06-10
 
 ### Fixed
 
-- 🔧 **Issue Assignment Fix**: Fixed list issues assignee username handling
-  - Corrected assignee username field in issue listing functionality
-  - Improved user assignment data processing for GitLab issues
-  - See: [PR #87](https://github.com/zereight/gitlab-mcp/pull/87), [Issue #74](https://github.com/zereight/gitlab-mcp/issues/74)
+- 🔐 **Private Token Authentication Fix**: Fixed Private-Token header authentication for GitLab API
+  - Removed incorrect `Bearer ` prefix from Private-Token header in legacy authentication mode
+  - Fixed authentication issues when using older GitLab instances with private tokens
+  - Ensures proper API authentication for both new and legacy GitLab configurations
+  - See: [PR #91](https://github.com/zereight/gitlab-mcp/pull/91), [Issue #88](https://github.com/zereight/gitlab-mcp/issues/88)
 
 ---

index.ts

@@ -4,7 +4,9 @@ import { Server } from "@modelcontextprotocol/sdk/server/index.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
 import { CallToolRequestSchema, ListToolsRequestSchema } from "@modelcontextprotocol/sdk/types.js";
-import fetch from "node-fetch";
+import nodeFetch from "node-fetch";
+import fetchCookie from "fetch-cookie";
+import { CookieJar, parse as parseCookie } from "tough-cookie";
 import { SocksProxyAgent } from "socks-proxy-agent";
 import { HttpsProxyAgent } from "https-proxy-agent";
 import { HttpProxyAgent } from "http-proxy-agent";
@@ -203,6 +205,7 @@ const server = new Server(
 );
 
 const GITLAB_PERSONAL_ACCESS_TOKEN = process.env.GITLAB_PERSONAL_ACCESS_TOKEN;
+const GITLAB_AUTH_COOKIE_PATH = process.env.GITLAB_AUTH_COOKIE_PATH;
 const IS_OLD = process.env.GITLAB_IS_OLD === "true";
 const GITLAB_READ_ONLY_MODE = process.env.GITLAB_READ_ONLY_MODE === "true";
 const USE_GITLAB_WIKI = process.env.USE_GITLAB_WIKI === "true";
@@ -245,6 +248,88 @@ if (HTTPS_PROXY) {
 httpsAgent = httpsAgent || new HttpsAgent(sslOptions);
 httpAgent = httpAgent || new Agent();
 
+// Create cookie jar with clean Netscape file parsing
+const createCookieJar = (): CookieJar | null => {
+  if (!GITLAB_AUTH_COOKIE_PATH) return null;
+  
+  try {
+    const cookiePath = GITLAB_AUTH_COOKIE_PATH.startsWith("~/")
+      ? path.join(process.env.HOME || "", GITLAB_AUTH_COOKIE_PATH.slice(2))
+      : GITLAB_AUTH_COOKIE_PATH;
+    
+    const jar = new CookieJar();
+    const cookieContent = fs.readFileSync(cookiePath, "utf8");
+    
+    cookieContent.split("\n").forEach(line => {
+      // Handle #HttpOnly_ prefix
+      if (line.startsWith("#HttpOnly_")) {
+        line = line.slice(10);
+      }
+      // Skip comments and empty lines
+      if (line.startsWith("#") || !line.trim()) {
+        return;
+      }
+      
+      // Parse Netscape format: domain, flag, path, secure, expires, name, value
+      const parts = line.split("\t");
+      if (parts.length >= 7) {
+        const [domain, , path, secure, expires, name, value] = parts;
+        
+        // Build cookie string in standard format
+        const cookieStr = `${name}=${value}; Domain=${domain}; Path=${path}${secure === "TRUE" ? "; Secure" : ""}${expires !== "0" ? `; Expires=${new Date(parseInt(expires) * 1000).toUTCString()}` : ""}`;
+        
+        // Use tough-cookie's parse function for robust parsing
+        const cookie = parseCookie(cookieStr);
+        if (cookie) {
+          const url = `${secure === "TRUE" ? "https" : "http"}://${domain.startsWith(".") ? domain.slice(1) : domain}`;
+          jar.setCookieSync(cookie, url);
+        }
+      }
+    });
+    
+    return jar;
+  } catch (error) {
+    console.error("Error loading cookie file:", error);
+    return null;
+  }
+};
+
+// Initialize cookie jar and fetch
+const cookieJar = createCookieJar();
+const fetch = cookieJar ? fetchCookie(nodeFetch, cookieJar) : nodeFetch;
+
+// Ensure session is established for the current request
+async function ensureSessionForRequest(): Promise<void> {
+  if (!cookieJar || !GITLAB_AUTH_COOKIE_PATH) return;
+  
+  // Extract the base URL from GITLAB_API_URL
+  const apiUrl = new URL(GITLAB_API_URL);
+  const baseUrl = `${apiUrl.protocol}//${apiUrl.hostname}`;
+  
+  // Check if we already have GitLab session cookies
+  const gitlabCookies = cookieJar.getCookiesSync(baseUrl);
+  const hasSessionCookie = gitlabCookies.some(cookie => 
+    cookie.key === '_gitlab_session' || cookie.key === 'remember_user_token'
+  );
+  
+  if (!hasSessionCookie) {
+    try {
+      // Establish session with a lightweight request
+      await fetch(`${GITLAB_API_URL}/user`, {
+        ...DEFAULT_FETCH_CONFIG,
+        redirect: 'follow'
+      }).catch(() => {
+        // Ignore errors - the important thing is that cookies get set during redirects
+      });
+      
+      // Small delay to ensure cookies are fully processed
+      await new Promise(resolve => setTimeout(resolve, 100));
+    } catch (error) {
+      // Ignore session establishment errors
+    }
+  }
+}
+
 // Modify DEFAULT_HEADERS to include agent configuration
 const DEFAULT_HEADERS: Record<string, string> = {
   Accept: "application/json",
@@ -523,7 +608,7 @@ const allTools = [
   },
   {
     name: "get_pipeline_job_output",
-    description: "Get the output/trace of a GitLab pipeline job number",
+    description: "Get the output/trace of a GitLab pipeline job with optional pagination to limit context window usage",
     inputSchema: zodToJsonSchema(GetPipelineJobOutputSchema),
   },
   {
@@ -2611,9 +2696,11 @@ async function getPipelineJob(projectId: string, jobId: number): Promise<GitLabP
  *
  * @param {string} projectId - The ID or URL-encoded path of the project
  * @param {number} jobId - The ID of the job
+ * @param {number} limit - Maximum number of lines to return from the end (default: 1000)
+ * @param {number} offset - Number of lines to skip from the end (default: 0)
  * @returns {Promise<string>} The job output/trace
  */
-async function getPipelineJobOutput(projectId: string, jobId: number): Promise<string> {
+async function getPipelineJobOutput(projectId: string, jobId: number, limit?: number, offset?: number): Promise<string> {
   projectId = decodeURIComponent(projectId); // Decode project ID
   const url = new URL(
     `${GITLAB_API_URL}/projects/${encodeURIComponent(projectId)}/jobs/${jobId}/trace`
@@ -2632,7 +2719,35 @@ async function getPipelineJobOutput(projectId: string, jobId: number): Promise<s
   }
 
   await handleGitLabError(response);
-  return await response.text();
+  const fullTrace = await response.text();
+  
+  // Apply client-side pagination to limit context window usage
+  if (limit !== undefined || offset !== undefined) {
+    const lines = fullTrace.split('\n');
+    const startOffset = offset || 0;
+    const maxLines = limit || 1000;
+    
+    // Return lines from the end, skipping offset lines and limiting to maxLines
+    const startIndex = Math.max(0, lines.length - startOffset - maxLines);
+    const endIndex = lines.length - startOffset;
+    
+    const selectedLines = lines.slice(startIndex, endIndex);
+    const result = selectedLines.join('\n');
+    
+    // Add metadata about truncation
+    if (startIndex > 0 || endIndex < lines.length) {
+      const totalLines = lines.length;
+      const shownLines = selectedLines.length;
+      const skippedFromStart = startIndex;
+      const skippedFromEnd = startOffset;
+      
+      return `[Log truncated: showing ${shownLines} of ${totalLines} lines, skipped ${skippedFromStart} from start, ${skippedFromEnd} from end]\n\n${result}`;
+    }
+    
+    return result;
+  }
+  
+  return fullTrace;
 }
 
 /**
@@ -3083,6 +3198,11 @@ server.setRequestHandler(CallToolRequestSchema, async request => {
       throw new Error("Arguments are required");
     }
     
+    // Ensure session is established for every request if cookie authentication is enabled
+    if (GITLAB_AUTH_COOKIE_PATH) {
+      await ensureSessionForRequest();
+    }
+
     switch (request.params.name) {
       case "fork_repository": {
         const forkArgs = ForkRepositorySchema.parse(request.params.arguments);
@@ -3732,8 +3852,8 @@ server.setRequestHandler(CallToolRequestSchema, async request => {
       }
 
       case "get_pipeline_job_output": {
-        const { project_id, job_id } = GetPipelineJobOutputSchema.parse(request.params.arguments);
-        const jobOutput = await getPipelineJobOutput(project_id, job_id);
+        const { project_id, job_id, limit, offset } = GetPipelineJobOutputSchema.parse(request.params.arguments);
+        const jobOutput = await getPipelineJobOutput(project_id, job_id, limit, offset);
         return {
           content: [
             {

package-lock.json

@@ -1,22 +1,24 @@
 {
   "name": "@zereight/mcp-gitlab",
-  "version": "1.0.60",
+  "version": "1.0.62",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@zereight/mcp-gitlab",
-      "version": "1.0.60",
+      "version": "1.0.62",
       "license": "MIT",
       "dependencies": {
         "@modelcontextprotocol/sdk": "1.8.0",
         "@types/node-fetch": "^2.6.12",
         "express": "^5.1.0",
+        "fetch-cookie": "^3.1.0",
         "form-data": "^4.0.0",
         "http-proxy-agent": "^7.0.2",
         "https-proxy-agent": "^7.0.6",
         "node-fetch": "^3.3.2",
         "socks-proxy-agent": "^8.0.5",
+        "tough-cookie": "^5.1.2",
         "zod-to-json-schema": "^3.23.5"
       },
       "bin": {
@@ -1709,6 +1711,16 @@
         "node": "^12.20 || >= 14.13"
       }
     },
+    "node_modules/fetch-cookie": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/fetch-cookie/-/fetch-cookie-3.1.0.tgz",
+      "integrity": "sha512-s/XhhreJpqH0ftkGVcQt8JE9bqk+zRn4jF5mPJXWZeQMCI5odV9K+wEWYbnzFPHgQZlvPSMjS4n4yawWE8RINw==",
+      "license": "Unlicense",
+      "dependencies": {
+        "set-cookie-parser": "^2.4.8",
+        "tough-cookie": "^5.0.0"
+      }
+    },
     "node_modules/file-entry-cache": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
@@ -2902,6 +2914,12 @@
         "node": ">= 18"
       }
     },
+    "node_modules/set-cookie-parser": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.1.tgz",
+      "integrity": "sha512-IOc8uWeOZgnb3ptbCURJWNjWUPcO3ZnTTdzsurqERrP6nPyv+paC55vJM0LpOlT2ne+Ix+9+CRG1MNLlyZ4GjQ==",
+      "license": "MIT"
+    },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
@@ -3090,6 +3108,24 @@
         "node": ">=8"
       }
     },
+    "node_modules/tldts": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-6.1.86.tgz",
+      "integrity": "sha512-WMi/OQ2axVTf/ykqCQgXiIct+mSQDFdH2fkwhPwgEwvJ1kSzZRiinb0zF2Xb8u4+OqPChmyI6MEu4EezNJz+FQ==",
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^6.1.86"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-6.1.86.tgz",
+      "integrity": "sha512-Je6p7pkk+KMzMv2XXKmAE3McmolOQFdxkKw0R8EYNr7sELW46JqnNeTX8ybPiQgvg1ymCoF8LXs5fzFaZvJPTA==",
+      "license": "MIT"
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -3112,6 +3148,18 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/tough-cookie": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
+      "integrity": "sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^6.1.32"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/tr46": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@zereight/mcp-gitlab",
-  "version": "1.0.62",
+  "version": "1.0.63",
   "description": "MCP server for using the GitLab API",
   "license": "MIT",
   "author": "zereight",
@@ -33,11 +33,13 @@
     "@modelcontextprotocol/sdk": "1.8.0",
     "@types/node-fetch": "^2.6.12",
     "express": "^5.1.0",
+    "fetch-cookie": "^3.1.0",
     "form-data": "^4.0.0",
     "http-proxy-agent": "^7.0.2",
     "https-proxy-agent": "^7.0.6",
     "node-fetch": "^3.3.2",
     "socks-proxy-agent": "^8.0.5",
+    "tough-cookie": "^5.1.2",
     "zod-to-json-schema": "^3.23.5"
   },
   "devDependencies": {

schemas.ts

@@ -191,6 +191,8 @@ export const CancelPipelineSchema = z.object({
 export const GetPipelineJobOutputSchema = z.object({
   project_id: z.string().describe("Project ID or URL-encoded path"),
   job_id: z.number().describe("The ID of the job"),
+  limit: z.number().optional().describe("Maximum number of lines to return from the end of the log (default: 1000)"),
+  offset: z.number().optional().describe("Number of lines to skip from the end of the log (default: 0)"),
 });
 
 // User schemas
@@ -296,14 +298,14 @@ export const GitLabRepositorySchema = z.object({
       project_access: z
         .object({
           access_level: z.number(),
-          notification_level: z.number().optional(),
+          notification_level: z.number().nullable().optional(),
         })
         .optional()
         .nullable(),
       group_access: z
         .object({
           access_level: z.number(),
-          notification_level: z.number().optional(),
+          notification_level: z.number().nullable().optional(),
         })
         .optional()
         .nullable(),