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<h1 id="backend-middleware">Backend Middleware<a class="headerlink" href="#backend-middleware" title="Permanent link">&para;</a></h1>
<p>Middleware components provide cross-cutting concerns for authentication, authorization, validation, rate limiting, and error handling across all API endpoints.</p>
<h2 id="middleware-architecture">Middleware Architecture<a class="headerlink" href="#middleware-architecture" title="Permanent link">&para;</a></h2>
<p>Express middleware functions are composed in the request pipeline to:</p>
<ul>
<li>Authenticate users via JWT tokens</li>
<li>Authorize access based on user roles</li>
<li>Validate request bodies against Zod schemas</li>
<li>Apply rate limits to prevent abuse</li>
<li>Handle errors consistently</li>
<li>Log requests and responses</li>
</ul>
<h2 id="core-middleware">Core Middleware<a class="headerlink" href="#core-middleware" title="Permanent link">&para;</a></h2>
<h3 id="authentication">Authentication<a class="headerlink" href="#authentication" title="Permanent link">&para;</a></h3>
<p><strong>authenticate</strong> (<code>middleware/auth.ts</code>)</p>
<ul>
<li>Verifies JWT access tokens from Authorization header</li>
<li>Attaches <code>req.user</code> object with user ID, email, and role</li>
<li>Returns 401 Unauthorized for missing/invalid tokens</li>
<li>Supports both admin and public route protection</li>
</ul>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nx">router</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s1">&#39;/profile&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">authenticate</span><span class="p">,</span><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">req</span><span class="p">,</span><span class="w"> </span><span class="nx">res</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w"> </span><span class="c1">// req.user is guaranteed to exist</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">userId</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">req</span><span class="p">.</span><span class="nx">user</span><span class="p">.</span><span class="nx">id</span><span class="p">;</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="p">});</span>
</span></code></pre></div>
<h3 id="authorization">Authorization<a class="headerlink" href="#authorization" title="Permanent link">&para;</a></h3>
<p><strong>requireRole</strong> (<code>middleware/auth.ts</code>)</p>
<ul>
<li>Checks if authenticated user has one of the required roles</li>
<li>Returns 403 Forbidden if role check fails</li>
<li>Supports multiple roles (OR logic)</li>
</ul>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="nx">router</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="s1">&#39;/campaigns&#39;</span><span class="p">,</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="nx">authenticate</span><span class="p">,</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="nx">requireRole</span><span class="p">(</span><span class="s1">&#39;SUPER_ADMIN&#39;</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;INFLUENCE_ADMIN&#39;</span><span class="p">),</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">req</span><span class="p">,</span><span class="w"> </span><span class="nx">res</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="c1">// Only admins can create campaigns</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="p">);</span>
</span></code></pre></div>
<p><strong>requireNonTemp</strong> (<code>middleware/auth.ts</code>)</p>
<ul>
<li>Blocks TEMP users from accessing endpoints</li>
<li>Used for routes that require full user accounts</li>
<li>TEMP users are created during shift signups</li>
</ul>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="nx">router</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="s1">&#39;/shifts/:id/signup&#39;</span><span class="p">,</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="nx">authenticate</span><span class="p">,</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="nx">requireNonTemp</span><span class="p">,</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">req</span><span class="p">,</span><span class="w"> </span><span class="nx">res</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="c1">// TEMP users cannot sign up for shifts</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="p">);</span>
</span></code></pre></div>
<h3 id="validation">Validation<a class="headerlink" href="#validation" title="Permanent link">&para;</a></h3>
<p><strong>validate</strong> (<code>middleware/validate.ts</code>)</p>
<ul>
<li>Validates request body against Zod schemas</li>
<li>Returns 400 Bad Request with sanitized error messages</li>
<li>Supports nested validation and type coercion</li>
<li>Prevents injection attacks by sanitizing output</li>
</ul>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">validate</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;../middleware/validate&#39;</span><span class="p">;</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">createCampaignSchema</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;./campaigns.schemas&#39;</span><span class="p">;</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="nx">router</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="s1">&#39;/campaigns&#39;</span><span class="p">,</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="nx">authenticate</span><span class="p">,</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="nx">validate</span><span class="p">(</span><span class="nx">createCampaignSchema</span><span class="p">),</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">req</span><span class="p">,</span><span class="w"> </span><span class="nx">res</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="c1">// req.body is type-safe and validated</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="p">);</span>
</span></code></pre></div>
<h3 id="rate-limiting">Rate Limiting<a class="headerlink" href="#rate-limiting" title="Permanent link">&para;</a></h3>
<p><strong>rateLimit</strong> (<code>middleware/rate-limit.ts</code>)</p>
<ul>
<li>Uses Redis for distributed rate limiting</li>
<li>Configurable window size and max requests</li>
<li>Returns 429 Too Many Requests when limit exceeded</li>
<li>Per-IP tracking with X-RateLimit headers</li>
</ul>
<p><strong>Common Configurations:</strong></p>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1">// Auth endpoints: 10 requests per minute</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="nx">rateLimitRedis</span><span class="p">({</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="nx">windowMs</span><span class="o">:</span><span class="w"> </span><span class="kt">60</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mf">1000</span><span class="p">,</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w"> </span><span class="nx">max</span><span class="o">:</span><span class="w"> </span><span class="kt">10</span><span class="p">,</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="w"> </span><span class="nx">standardHeaders</span><span class="o">:</span><span class="w"> </span><span class="kt">true</span><span class="p">,</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="w"> </span><span class="nx">legacyHeaders</span><span class="o">:</span><span class="w"> </span><span class="kt">false</span><span class="p">,</span>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w"> </span><span class="nx">keyPrefix</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;rl:auth:&#39;</span><span class="p">,</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="p">})</span>
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="c1">// Canvass visits: 30 requests per minute</span>
</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="nx">rateLimitRedis</span><span class="p">({</span>
</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a><span class="w"> </span><span class="nx">windowMs</span><span class="o">:</span><span class="w"> </span><span class="kt">60</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mf">1000</span><span class="p">,</span>
</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="w"> </span><span class="nx">max</span><span class="o">:</span><span class="w"> </span><span class="kt">30</span><span class="p">,</span>
</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="w"> </span><span class="nx">keyPrefix</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;rl:canvass-visit:&#39;</span><span class="p">,</span>
</span><span id="__span-4-15"><a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="p">})</span>
</span></code></pre></div>
<h3 id="error-handling">Error Handling<a class="headerlink" href="#error-handling" title="Permanent link">&para;</a></h3>
<p><strong>errorHandler</strong> (<code>middleware/error-handler.ts</code>)</p>
<ul>
<li>Catches all unhandled errors in routes</li>
<li>Formats errors consistently as JSON</li>
<li>Logs errors with Winston</li>
<li>Sanitizes error messages in production</li>
<li>Returns appropriate HTTP status codes</li>
</ul>
<h3 id="request-logging">Request Logging<a class="headerlink" href="#request-logging" title="Permanent link">&para;</a></h3>
<p><strong>requestLogger</strong> (<code>middleware/logger.ts</code>)</p>
<ul>
<li>Logs all incoming requests with Morgan</li>
<li>Tracks response times</li>
<li>Formats logs with Winston</li>
<li>Separates error logs from access logs</li>
</ul>
<h2 id="middleware-composition">Middleware Composition<a class="headerlink" href="#middleware-composition" title="Permanent link">&para;</a></h2>
<p>Middleware is applied in order and can be composed:</p>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="c1">// Global middleware (applies to all routes)</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="nx">app</span><span class="p">.</span><span class="nx">use</span><span class="p">(</span><span class="nx">helmet</span><span class="p">());</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="nx">app</span><span class="p">.</span><span class="nx">use</span><span class="p">(</span><span class="nx">cors</span><span class="p">());</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="nx">app</span><span class="p">.</span><span class="nx">use</span><span class="p">(</span><span class="nx">requestLogger</span><span class="p">);</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="c1">// Route-specific middleware</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="nx">router</span><span class="p">.</span><span class="nx">post</span><span class="p">(</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="s1">&#39;/api/campaigns&#39;</span><span class="p">,</span>
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w"> </span><span class="nx">rateLimit</span><span class="p">({</span><span class="w"> </span><span class="nx">max</span><span class="o">:</span><span class="w"> </span><span class="kt">100</span><span class="w"> </span><span class="p">}),</span>
</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="w"> </span><span class="nx">authenticate</span><span class="p">,</span>
</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="w"> </span><span class="nx">requireRole</span><span class="p">(</span><span class="s1">&#39;SUPER_ADMIN&#39;</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;INFLUENCE_ADMIN&#39;</span><span class="p">),</span>
</span><span id="__span-5-12"><a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a><span class="w"> </span><span class="nx">validate</span><span class="p">(</span><span class="nx">createCampaignSchema</span><span class="p">),</span>
</span><span id="__span-5-13"><a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a><span class="w"> </span><span class="nx">campaignController</span><span class="p">.</span><span class="nx">create</span>
</span><span id="__span-5-14"><a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a><span class="p">);</span>
</span><span id="__span-5-15"><a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a>
</span><span id="__span-5-16"><a id="__codelineno-5-16" name="__codelineno-5-16" href="#__codelineno-5-16"></a><span class="c1">// Global error handler (last middleware)</span>
</span><span id="__span-5-17"><a id="__codelineno-5-17" name="__codelineno-5-17" href="#__codelineno-5-17"></a><span class="nx">app</span><span class="p">.</span><span class="nx">use</span><span class="p">(</span><span class="nx">errorHandler</span><span class="p">);</span>
</span></code></pre></div>
<h2 id="security-features">Security Features<a class="headerlink" href="#security-features" title="Permanent link">&para;</a></h2>
<h3 id="password-policy">Password Policy<a class="headerlink" href="#password-policy" title="Permanent link">&para;</a></h3>
<ul>
<li>Enforced at schema validation level</li>
<li>12+ characters required</li>
<li>Must include uppercase, lowercase, and digit</li>
<li>Validated in <code>auth.schemas.ts</code></li>
</ul>
<h3 id="user-enumeration-prevention">User Enumeration Prevention<a class="headerlink" href="#user-enumeration-prevention" title="Permanent link">&para;</a></h3>
<ul>
<li>Returns 401 instead of 404 for missing users</li>
<li>Consistent response times for invalid credentials</li>
<li>No detailed error messages about which field failed</li>
</ul>
<h3 id="refresh-token-rotation">Refresh Token Rotation<a class="headerlink" href="#refresh-token-rotation" title="Permanent link">&para;</a></h3>
<ul>
<li>Atomic transaction to prevent race conditions</li>
<li>Invalidates old refresh token on rotation</li>
<li>Tracks token family for security</li>
<li>Automatic cleanup of expired tokens</li>
</ul>
<h3 id="redis-authentication">Redis Authentication<a class="headerlink" href="#redis-authentication" title="Permanent link">&para;</a></h3>
<ul>
<li>All Redis connections require password</li>
<li>Configured via <code>REDIS_PASSWORD</code> environment variable</li>
<li>Prevents unauthorized cache/queue access</li>
</ul>
<h2 id="middleware-chain">Middleware Chain<a class="headerlink" href="#middleware-chain" title="Permanent link">&para;</a></h2>
<p>Typical middleware chain for protected routes:</p>
<ol>
<li><strong>CORS</strong> - Handle cross-origin requests</li>
<li><strong>Helmet</strong> - Security headers</li>
<li><strong>Request Logger</strong> - Log incoming request</li>
<li><strong>Body Parser</strong> - Parse JSON body</li>
<li><strong>Rate Limit</strong> - Check rate limits</li>
<li><strong>Authenticate</strong> - Verify JWT token</li>
<li><strong>Authorize</strong> - Check user role</li>
<li><strong>Validate</strong> - Validate request schema</li>
<li><strong>Route Handler</strong> - Execute business logic</li>
<li><strong>Error Handler</strong> - Catch and format errors</li>
</ol>
<h2 id="related-documentation">Related Documentation<a class="headerlink" href="#related-documentation" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="../">Backend Overview</a></li>
<li><a href="../modules/auth/">Authentication Module</a></li>
<li><a href="../../deployment/security.md">Security Audit</a></li>
<li><a href="../../deployment/environment-variables/">Environment Variables</a></li>
<li><a href="../../deployment/rate-limiting.md">Rate Limiting</a></li>
</ul>
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