// API middleware: body parsing, auth token handling, API gate, and JSON response helper.
// Replaces communitypackages:json-routes middleware chain.
// Must be imported before model files that register API routes.

const { Meteor } = require('meteor/meteor');
const { WebApp } = require('meteor/webapp');
const { safeJsonStringify } = require('/server/lib/apiResponseHelpers');

// ---------------------------------------------------------------------------
// 1. Body parsing (previously registered by json-routes)
// ---------------------------------------------------------------------------
// Reuse Meteor's Express parsers. Rspack 2 no longer brings body-parser into
// the app's node_modules through its development server dependencies.
// A bounce webhook's signature is over the bytes as they were sent (SendGrid,
// Resend), so for those paths the raw body is kept beside the parsed one.
const keepRawBody = (req, res, buf) => {
  if (/^\/api\/inbound-email\/bounces\//.test(String(req.url || ''))) req.rawBody = buf.toString('utf8');
};
WebApp.handlers.use(WebApp.express.urlencoded({ limit: '50mb', extended: false, verify: keepRawBody }));
WebApp.handlers.use(WebApp.express.json({ limit: '50mb', verify: keepRawBody }));

// ---------------------------------------------------------------------------
// 2. API gate — check WITH_API env var (previously in models/users.js)
// ---------------------------------------------------------------------------
// Express matches routes case-insensitively and on the decoded path, so the
// gate must too: with WITH_API off, /API/... and /%61pi/... reached the API
// (2026-10-02).
function isApiPath(url) {
  let pathname = String(url || '').split('?')[0];
  try { pathname = decodeURIComponent(pathname); } catch (e) { /* keep it raw */ }
  return /^\/api(\/|$)/i.test(pathname);
}

// The inbound email endpoints are not the REST API: a mail provider (or Amazon
// SES through SNS) posts email to them, and they have gates of their own - the
// Admin Panel's email-to-card switch and webhook secret, the reply address's
// signature, SNS's message signature (server/routes/inboundEmail.js,
// server/emailBounces.js). Email to card must not need the whole REST API
// turned on, so these exact POST paths pass the WITH_API gate.
const INBOUND_EMAIL_PATHS = ['/api/inbound-email', '/api/inbound-email/ses'];
// The bounce webhooks of the other sending services (server/emailBounces.js).
const BOUNCE_WEBHOOK_PATH = /^\/api\/inbound-email\/bounces\/(mailgun|sendgrid|postmark|brevo|mailjet|sparkpost|mandrill|resend)$/;
function isInboundEmailPath(req) {
  if (req.method !== 'POST') return false;
  let pathname = String(req.url || '').split('?')[0];
  try { pathname = decodeURIComponent(pathname); } catch (e) { return false; }
  pathname = pathname.replace(/\/+$/, '');
  return INBOUND_EMAIL_PATHS.includes(pathname) || BOUNCE_WEBHOOK_PATH.test(pathname);
}

WebApp.handlers.use(function apiGate(req, res, next) {
  const api = isApiPath(req.url);
  // CacheBleed, API sibling (2026-10-02): every API answer is the caller's -
  // exports, attachment downloads as base64, board data - and none said so, so
  // a shared cache was free to keep one by heuristics. A route may still set
  // its own policy.
  if (api) res.setHeader('Cache-Control', 'no-store');
  if ((api && process.env.WITH_API === 'true') || !api || isInboundEmailPath(req)) {
    return next();
  }
  // REFUSED, IN WORDS - not a redirect to the front page.
  //
  // This used to answer `301 Location: /`, and every export in the interface is
  // a download from an `/api/...` address: a board or a card to PDF, Excel,
  // JSON, .zip, CSV. The browser followed the redirect, got WeKan's own HTML
  // page, and wrote it to the file the download link had named - so "the API is
  // off" arrived as a PDF that no reader could open, with nothing anywhere
  // saying why. A 403 with a sentence in it cannot be mistaken for the file
  // that was asked for, and it says what to change.
  res.writeHead(403, { 'Content-Type': 'text/plain; charset=utf-8' });
  return res.end(
    'WeKan API is disabled, so this address answers nothing.\n'
    + '\n'
    + 'Exports use it too - a board or card exported to PDF, Excel, JSON, .zip\n'
    + 'or CSV is a download from /api/..., so with the API off none of them can\n'
    + 'work. Set the environment variable WITH_API=true and restart WeKan.\n',
  );
});

// ---------------------------------------------------------------------------
// 3. Bearer token parser (replaces communitypackages:rest-bearer-token-parser)
// ---------------------------------------------------------------------------
WebApp.handlers.use(function parseBearerToken(req, res, next) {
  // Check Authorization header first
  const authHeader = req.headers.authorization;
  if (authHeader) {
    const match = authHeader.match(/^Bearer\s+(.+)$/i);
    if (match) {
      req.authToken = match[1];
    }
  }

  // Fallback to access_token query param
  if (!req.authToken && req.query && req.query.access_token) {
    req.authToken = req.query.access_token;
  }

  next();
});

// ---------------------------------------------------------------------------
// 4. User authentication (replaces communitypackages:authenticate-user-by-token)
// ---------------------------------------------------------------------------
WebApp.handlers.use(async function authenticateByToken(req, res, next) {
  if (req.authToken) {
    try {
      const user = await require('/server/lib/activeUser').activeUserByToken(req.authToken, 'apiMiddleware', req);
      if (user) {
        req.userId = user._id;
      }
    } catch (e) {
      // Ignore auth errors — routes handle missing userId themselves
    }
  }
  next();
});

// ---------------------------------------------------------------------------
// 4a. Sandstorm API keys: in a grain, the bridge says who is calling
// (models/lib/sandstormApiIdentity.js). Never off Sandstorm, never in place of
// a WeKan token, and only for an account that already exists and is enabled.
// ---------------------------------------------------------------------------
const isSandstormGrain = !!(Meteor.settings && Meteor.settings.public && Meteor.settings.public.sandstorm);
WebApp.handlers.use(async function authenticateSandstormApiKey(req, res, next) {
  if (req.userId || !isSandstormGrain) return next();
  try {
    const { sandstormApiIdentity } = require('/models/lib/sandstormApiIdentity');
    const identity = sandstormApiIdentity(req.headers, { sandstorm: isSandstormGrain, method: req.method });
    if (identity) {
      const user = await Meteor.users.findOneAsync({ 'services.sandstorm.id': identity.sandstormId }, { fields: { _id: 1, loginDisabled: 1 } });
      if (user && require('/server/lib/activeUser').allowActiveUser(user, 'sandstormApiKey', req)) {
        req.userId = user._id;
      }
    }
  } catch (e) {
    // Ignore auth errors — routes handle missing userId themselves
  }
  next();
});

// ---------------------------------------------------------------------------
// 4b. API usage counting (Admin Panel -> Problems -> API)
// ---------------------------------------------------------------------------
// After authentication, so a call has an account, and in front of the routes, so
// a route cannot be added without being counted. It counts on the response's
// `finish` event - by then Express has filled req.route.path, which is the route
// PATTERN and therefore one row per endpoint rather than one per board id.
WebApp.handlers.use(require('/server/lib/apiUsageLog').apiUsageMiddleware);

// ---------------------------------------------------------------------------
// 5. sendJsonResult — drop-in replacement for JsonRoutes.sendResult
// ---------------------------------------------------------------------------
function sendJsonResult(res, options) {
  const { containsFields } = require('/models/lib/adminOnlyCustomFields');
  if (!containsFields(options?.data)) return writeJsonResult(res, options);
  return require('/server/lib/adminOnlyCustomFields').redactFields(options.data, res.req?.userId)
    .then(data => writeJsonResult(res, { ...options, data }))
    .catch(() => writeJsonResult(res, { code: 500, data: { error: 'Response unavailable' } }));
}

function writeJsonResult(res, options) {
  options = options || {};

  // Default response headers (matching json-routes behavior)
  res.setHeader('Cache-Control', 'no-store');
  res.setHeader('Pragma', 'no-cache');

  // Custom headers
  if (options.headers) {
    Object.entries(options.headers).forEach(function ([key, value]) {
      res.setHeader(key, value);
    });
  }

  // Status code
  res.statusCode = options.code || 200;

  // JSON body
  if (options.data !== undefined) {
    const shouldPrettyPrint = process.env.NODE_ENV === 'development';
    const spacer = shouldPrettyPrint ? 2 : null;
    res.setHeader('Content-Type', 'application/json');
    // Use a crash-proof serializer: some error payloads (e.g. a circular
    // SimpleSchema validation error) would otherwise throw inside
    // JSON.stringify and surface as a generic HTTP 500. See #5804.
    res.write(safeJsonStringify(options.data, spacer));
  }

  res.end();
}

// GHSA-3gcg-g6rf-w2rx: an export route that throws must not escape as an unhandled
// promise rejection. This app turns one of those into a full process crash - the
// note in server/ldapGroupSync.js explains why - so a single crafted request could
// take the server down for everyone. Every route body wrapped in this answers with a
// 500 instead. Only the registered route pattern and a fixed error category
// are folded into API Problems; concrete requests and exception text are secret.
//
// The guards inside the handlers are still the real fix; this is the net under them,
// so the next missing null check is one broken request rather than an outage.
function safeRoute(handler) {
  return async function safeRouteHandler(req, res, ...rest) {
    try {
      return await handler.call(this, req, res, ...rest);
    } catch (error) {
      try { require('/server/lib/apiFailureLog').recordApiFailure(req, error); }
      catch (_) { /* Logging is best effort and must never prevent the response. */ }
      try {
        if (!res.headersSent) {
          res.writeHead(500, { 'Content-Type': 'text/plain; charset=utf-8' });
        }
        res.end('Internal server error');
      } catch (_) {
        // The response is already gone; nothing left to answer with.
      }
      return undefined;
    }
  };
}

module.exports = { sendJsonResult, safeRoute };