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* Instance Configuration Loader
*
* Loads GitLab instance configuration from multiple sources:
* 1. GITLAB_INSTANCES_FILE - Path to YAML/JSON config file
* 2. GITLAB_INSTANCES - Environment variable (single URL, array, or JSON)
* 3. GITLAB_API_URL + GITLAB_TOKEN - Legacy single-instance mode
*
* Configuration priority (first match wins):
* 1. GITLAB_INSTANCES_FILE (if set, load from file)
* 2. GITLAB_INSTANCES (env var - URL, array, or JSON)
* 3. GITLAB_API_URL (legacy single-instance)
*/
import * as fs from "fs";
import * as os from "os";
import * as path from "path";
import { logInfo, logWarn, logError, logDebug } from "../logger.js";
import {
GitLabInstanceConfig,
InstancesConfigFile,
validateInstancesConfig,
parseInstanceUrlString,
applyInstanceDefaults,
} from "./instances-schema.js";
/**
* Loaded instances configuration result
*/
export interface LoadedInstancesConfig {
/** List of configured instances */
instances: GitLabInstanceConfig[];
/** Configuration source for logging */
source: "file" | "env" | "legacy" | "none";
/** Source details (file path or env var name) */
sourceDetails: string;
}
/**
* Load YAML configuration (requires optional yaml package)
*/
async function loadYamlFile(filePath: string): Promise<unknown> {
try {
// Dynamic import to avoid requiring yaml as mandatory dependency
const yaml = await import("yaml");
const content = fs.readFileSync(filePath, "utf-8");
return yaml.parse(content);
} catch (error) {
const err = error as NodeJS.ErrnoException & { code?: string; message?: string };
const code = err.code;
const message = err.message;
// Check for missing yaml module - Node ESM uses ERR_MODULE_NOT_FOUND
const isModuleNotFoundCode = code === "MODULE_NOT_FOUND" || code === "ERR_MODULE_NOT_FOUND";
const isYamlNotFoundMessage =
typeof message === "string" &&
(message.includes("Cannot find package 'yaml'") ||
message.includes("Cannot find module 'yaml'"));
if (isModuleNotFoundCode || isYamlNotFoundMessage) {
throw new Error(`YAML configuration requires 'yaml' package. Install with: yarn add yaml`);
}
throw error;
}
}
/**
* Load JSON configuration
*/
function loadJsonFile(filePath: string): unknown {
const content = fs.readFileSync(filePath, "utf-8");
return JSON.parse(content);
}
/**
* Load configuration from file (YAML or JSON)
*/
async function loadConfigFile(filePath: string): Promise<InstancesConfigFile> {
// Resolve home directory expansion using os.homedir() for cross-platform support
const resolvedPath = filePath.startsWith("~")
? path.join(os.homedir(), filePath.slice(1))
: filePath;
if (!fs.existsSync(resolvedPath)) {
throw new Error(`Configuration file not found: ${resolvedPath}`);
}
const ext = path.extname(resolvedPath).toLowerCase();
let rawConfig: unknown;
if (ext === ".yaml" || ext === ".yml") {
rawConfig = await loadYamlFile(resolvedPath);
} else if (ext === ".json") {
rawConfig = loadJsonFile(resolvedPath);
} else {
// Try to detect format from content
const content = fs.readFileSync(resolvedPath, "utf-8").trim();
if (content.startsWith("{")) {
rawConfig = JSON.parse(content);
} else {
rawConfig = await loadYamlFile(resolvedPath);
}
}
return validateInstancesConfig(rawConfig);
}
/**
* Parse GITLAB_INSTANCES environment variable
* Supports formats:
* - Single URL: "https://gitlab.com"
* - Bash array: "(https://gitlab.com https://git.corp.io)"
* - JSON array: '["https://gitlab.com", "https://git.corp.io"]'
* - JSON object: '{"instances": [...]}'
*/
function parseInstancesEnvVar(value: string): GitLabInstanceConfig[] {
const trimmed = value.trim();
// Check for JSON object format
if (trimmed.startsWith("{")) {
const parsed: unknown = JSON.parse(trimmed);
const config = validateInstancesConfig(parsed);
return config.instances;
}
// Check for JSON array format
if (trimmed.startsWith("[")) {
const parsed = JSON.parse(trimmed) as string[];
return parsed.map((url: string) => parseInstanceUrlString(url));
}
// Check for bash array format: (url1 url2 url3)
if (trimmed.startsWith("(") && trimmed.endsWith(")")) {
const inner = trimmed.slice(1, -1).trim();
// Split by whitespace, handling quoted strings
const urls: string[] = inner.match(/(?:[^\s"]+|"[^"]*")+/g) ?? [];
return urls.map((url: string) => {
// Remove surrounding quotes if present
const cleanUrl = url.startsWith('"') && url.endsWith('"') ? url.slice(1, -1) : url;
return parseInstanceUrlString(cleanUrl);
});
}
// Check for whitespace-separated URLs (space, tab, newline)
if (/\s/.test(trimmed)) {
const urls = trimmed.split(/\s+/).filter(url => url.length > 0);
return urls.map((url: string) => parseInstanceUrlString(url));
}
// Single URL format
return [parseInstanceUrlString(trimmed)];
}
/**
* Load instances configuration from all sources
*/
export async function loadInstancesConfig(): Promise<LoadedInstancesConfig> {
const instancesFile = process.env.GITLAB_INSTANCES_FILE;
const instancesEnv = process.env.GITLAB_INSTANCES;
const legacyBaseUrl = process.env.GITLAB_API_URL;
// Priority 1: Configuration file
if (instancesFile) {
try {
logDebug("Loading instances from configuration file", { path: instancesFile });
const config = await loadConfigFile(instancesFile);
// Apply defaults to all instances
const instances = config.instances.map(inst => applyInstanceDefaults(inst, config.defaults));
logInfo("Loaded GitLab instances from configuration file", {
path: instancesFile,
count: instances.length,
instances: instances.map(i => i.label ?? i.url),
});
return {
instances,
source: "file",
sourceDetails: instancesFile,
};
} catch (error) {
logError("Failed to load instances configuration file", {
path: instancesFile,
err: error instanceof Error ? error : new Error(String(error)),
});
throw error;
}
}
// Priority 2: Environment variable
if (instancesEnv) {
try {
logDebug("Loading instances from GITLAB_INSTANCES env var");
const instances = parseInstancesEnvVar(instancesEnv);
logInfo("Loaded GitLab instances from environment variable", {
count: instances.length,
instances: instances.map(i => i.label ?? i.url),
});
return {
instances,
source: "env",
sourceDetails: "GITLAB_INSTANCES",
};
} catch (error) {
logError("Failed to parse GITLAB_INSTANCES environment variable", {
err: error instanceof Error ? error : new Error(String(error)),
});
throw error;
}
}
// Priority 3: Legacy single-instance mode
if (legacyBaseUrl) {
logDebug("Using legacy GITLAB_API_URL configuration");
// Normalize URL (same logic as config.ts normalizeGitLabBaseUrl)
let normalizedUrl = legacyBaseUrl;
if (normalizedUrl.endsWith("/")) {
normalizedUrl = normalizedUrl.slice(0, -1);
}
if (normalizedUrl.endsWith("/api/v4")) {
normalizedUrl = normalizedUrl.slice(0, -7);
}
if (normalizedUrl.endsWith("/api/graphql")) {
normalizedUrl = normalizedUrl.slice(0, -12);
}
const instance: GitLabInstanceConfig = {
url: normalizedUrl,
label: "Default Instance",
insecureSkipVerify: process.env.SKIP_TLS_VERIFY === "true",
};
logInfo("Using legacy single-instance configuration", {
url: normalizedUrl,
});
return {
instances: [instance],
source: "legacy",
sourceDetails: "GITLAB_API_URL",
};
}
// No configuration - use default gitlab.com
logWarn("No GitLab instance configuration found, using gitlab.com as default");
return {
instances: [
{
url: "https://gitlab.com",
label: "GitLab.com",
insecureSkipVerify: false,
},
],
source: "none",
sourceDetails: "default",
};
}
/**
* Get a specific instance configuration by URL
*/
export function getInstanceByUrl(
instances: GitLabInstanceConfig[],
url: string
): GitLabInstanceConfig | undefined {
// Normalize the search URL
let normalizedSearch = url;
if (normalizedSearch.endsWith("/")) {
normalizedSearch = normalizedSearch.slice(0, -1);
}
if (normalizedSearch.endsWith("/api/v4")) {
normalizedSearch = normalizedSearch.slice(0, -7);
}
if (normalizedSearch.endsWith("/api/graphql")) {
normalizedSearch = normalizedSearch.slice(0, -12);
}
return instances.find(inst => inst.url === normalizedSearch);
}
/**
* Check if a URL matches a configured instance
*/
export function isKnownInstance(instances: GitLabInstanceConfig[], url: string): boolean {
return getInstanceByUrl(instances, url) !== undefined;
}
/**
* Create a sample configuration file content
*/
export function generateSampleConfig(format: "yaml" | "json"): string {
const config: InstancesConfigFile = {
instances: [
{
url: "https://gitlab.com",
label: "GitLab.com",
insecureSkipVerify: false,
},
{
url: "https://git.corp.io",
label: "Corporate GitLab",
oauth: {
clientId: "your_app_id",
clientSecret: "your_secret",
scopes: "api read_user",
},
rateLimit: {
maxConcurrent: 50,
queueSize: 200,
queueTimeout: 30000,
},
insecureSkipVerify: false,
},
],
defaults: {
rateLimit: {
maxConcurrent: 100,
queueSize: 500,
queueTimeout: 60000,
},
oauth: {
scopes: "api read_user",
},
},
};
if (format === "json") {
return JSON.stringify(config, null, 2);
}
// YAML format - manual generation to preserve comments
return `# GitLab MCP Instances Configuration
# Documentation: https://gitlab-mcp.sw.foundation/advanced/multi-instance
instances:
# Minimal configuration (OAuth disabled or uses global credentials)
- url: https://gitlab.com
label: "GitLab.com"
# Full configuration with OAuth
- url: https://git.corp.io
label: "Corporate GitLab"
oauth:
clientId: "your_app_id"
clientSecret: "your_secret" # Only for confidential apps
scopes: "api read_user" # Optional, default: api read_user
rateLimit:
maxConcurrent: 50 # Max parallel requests
queueSize: 200 # Max queued requests
queueTimeout: 30000 # Queue wait timeout (ms)
# Global defaults (applied to all instances unless overridden)
defaults:
rateLimit:
maxConcurrent: 100
queueSize: 500
queueTimeout: 60000
oauth:
scopes: "api read_user"
`;
}
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