diff --git a/iiif-server/src/index.js b/iiif-server/src/index.js
index 9189af4..1801beb 100644
--- a/iiif-server/src/index.js
+++ b/iiif-server/src/index.js
@@ -1,7 +1,6 @@
 const authorize = require("./authorize");
-const jwt = require('jsonwebtoken');
-const querystring = require('querystring');
-
+const validateJwtClaims = require("./validate-jwt");
+const jwt = require("jsonwebtoken");
 const middy = require("@middy/core");
 const secretsManager = require("@middy/secrets-manager");
 
@@ -18,6 +17,14 @@ function getEventHeader(request, name) {
   }
 }
 
+function s3Location(params, bucket) {
+  const pairtree = params.id.match(/.{1,2}/g).join("/");
+
+  return params.poster
+    ? `s3://${bucket}/posters/${pairtree}-poster.tif`
+    : `s3://${bucket}/${pairtree}-pyramid.tif`;
+}
+
 function viewerRequestOptions(request) {
   const origin = getEventHeader(request, "origin") || "*";
   return {
@@ -48,7 +55,8 @@ function parsePath(path) {
     return {
       poster: segments[2] == "posters",
       id: segments[1],
-      filename: segments[0]
+      filename: segments[0],
+      version: segments[6]
     };
   } else {
     const filename = segments[0].split(".");
@@ -60,7 +68,8 @@ function parsePath(path) {
       rotation: segments[1],
       filename: segments[0],
       quality: filename[0],
-      format: filename[1]
+      format: filename[1],
+      version: segments[5]
     };
   }
 }
@@ -70,38 +79,8 @@ function getAuthSignature(request) {
     return null;
   }
 
-  const parsedQuery = querystring.parse(request.querystring);
-  return parsedQuery['Auth-Signature'] || null;
-}
-
-function validateJwtClaims(jwtClaims, params) {
-  const currentTime = Math.floor(Date.now() / 1000);
-  const errors = [];
-
-  if (jwtClaims.exp <= currentTime) {
-    errors.push("Token expired");
-  }
-
-  if (jwtClaims.sub !== params.id) {
-    errors.push("ID mismatch");
-  }
-
-  const fields = ['region', 'size', 'rotation', 'quality', 'format'];
-  for (const field of fields) {
-    if (jwtClaims[field] && !jwtClaims[field].includes(params[field])) {
-      errors.push(`${field} mismatch`);
-    }
-  }
-
-  if (jwtClaims['max-width'] && params.size.width > jwtClaims['max-width']) {
-    errors.push("Width too large");
-  }
-
-  if (jwtClaims['max-height'] && params.size.height > jwtClaims['max-height']) {
-    errors.push("Height too large");
-  }
-
-  return errors;
+  const parsedQuery = new URLSearchParams(request.querystring);
+  return parsedQuery.get('Auth-Signature', null)
 }
 
 async function viewerRequestIiif(request, { config }) {
@@ -110,33 +89,32 @@ async function viewerRequestIiif(request, { config }) {
   const referer = getEventHeader(request, "referer");
   const cookie = getEventHeader(request, "cookie");
   const authSignature = getAuthSignature(request);
-  
-  if(authSignature) {
-      console.log("Verifying JWT")
-      let jwtClaims;
-      try {
-        jwtClaims = jwt.verify(authSignature, config.apiTokenKey);
-      } catch (err) {
-        console.log(err)
-        return {
-          status: "403",
-          statusDescription: "Forbidden",
-          body: "Invalid JWT"
-        };
-      }
-
-      const jwtValidationErrors = validateJwtClaims(jwtClaims, params);
-  
-      if (jwtValidationErrors.length > 0) {
-        console.log(`Could not verify JWT claims: ${jwtValidationErrors.join(", ")}`)
-        return {
-          status: "403",
-          statusDescription: "Forbidden",
-          body: "Forbidden"
-        };
-      }
+
+  if (authSignature) {
+    let jwtClaims;
+    try {
+      jwtClaims = jwt.verify(authSignature, config.apiTokenKey);
+    } catch (err) {
+      console.error(err)
+      return {
+        status: "403",
+        statusDescription: "Forbidden",
+        body: "Invalid JWT"
+      };
+    }
+
+    const jwtResult = await validateJwtClaims(jwtClaims, params, config);
+
+    if (!jwtResult.valid) {
+      console.log(`Could not verify JWT claims: ${jwtResult.reason}`);
+      return {
+        status: "403",
+        statusDescription: "Forbidden",
+        body: "Forbidden"
+      };
+    }
   }
-  
+
   const authed = await authorize(
     params,
     referer,
@@ -156,12 +134,9 @@ async function viewerRequestIiif(request, { config }) {
   }
 
   // Set the x-preflight-location request header to the location of the requested item
-  const pairtree = params.id.match(/.{1,2}/g).join("/");
-  const s3Location = params.poster
-    ? `s3://${config.tiffBucket}/posters/${pairtree}-poster.tif`
-    : `s3://${config.tiffBucket}/${pairtree}-pyramid.tif`;
+  const location = s3Location(params, config.tiffBucket);
   request.headers["x-preflight-location"] = [
-    { key: "X-Preflight-Location", value: s3Location }
+    { key: "X-Preflight-Location", value: location }
   ];
   return request;
 }
@@ -226,14 +201,14 @@ function functionNameAndRegion() {
 const { functionName, functionRegion } = functionNameAndRegion();
 console.log("Initializing", functionName, 'in', functionRegion);
 
-module.exports = { 
+module.exports = {
   handler:
     middy(processRequest)
-    .use(
-      secretsManager({
-        fetchData: { config: functionName },
-        awsClientOptions: { region: functionRegion },
-        setToContext: true
-      })
-    )
+      .use(
+        secretsManager({
+          fetchData: { config: functionName },
+          awsClientOptions: { region: functionRegion },
+          setToContext: true
+        })
+      )
 };
diff --git a/iiif-server/src/package-lock.json b/iiif-server/src/package-lock.json
index 5218be8..336be7e 100644
--- a/iiif-server/src/package-lock.json
+++ b/iiif-server/src/package-lock.json
@@ -11,6 +11,7 @@
       "dependencies": {
         "@middy/core": "4.6.4",
         "@middy/secrets-manager": "4.6.4",
+        "iiif-processor": "^4.0.7",
         "jsonwebtoken": "^9.0.2",
         "lodash.isstring": "^4.0.1",
         "node-fetch": "^2.3.0"
@@ -55,11 +56,197 @@
         "url": "https://github.com/sponsors/willfarrell"
       }
     },
+    "node_modules/b4a": {
+      "version": "1.6.7",
+      "resolved": "https://registry.npmjs.org/b4a/-/b4a-1.6.7.tgz",
+      "integrity": "sha512-OnAYlL5b7LEkALw87fUVafQw5rVR9RjwGd4KUwNQ6DrrNmaVaUCgLipfVlzrPQ4tWOR9P0IXGNOx50jYCCdSJg=="
+    },
+    "node_modules/bare-events": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/bare-events/-/bare-events-2.5.0.tgz",
+      "integrity": "sha512-/E8dDe9dsbLyh2qrZ64PEPadOQ0F4gbl1sUJOrmph7xOiIxfY8vwab/4bFLh4Y88/Hk/ujKcrQKc+ps0mv873A==",
+      "optional": true
+    },
+    "node_modules/bare-fs": {
+      "version": "2.3.5",
+      "resolved": "https://registry.npmjs.org/bare-fs/-/bare-fs-2.3.5.tgz",
+      "integrity": "sha512-SlE9eTxifPDJrT6YgemQ1WGFleevzwY+XAP1Xqgl56HtcrisC2CHCZ2tq6dBpcH2TnNxwUEUGhweo+lrQtYuiw==",
+      "optional": true,
+      "dependencies": {
+        "bare-events": "^2.0.0",
+        "bare-path": "^2.0.0",
+        "bare-stream": "^2.0.0"
+      }
+    },
+    "node_modules/bare-os": {
+      "version": "2.4.4",
+      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-2.4.4.tgz",
+      "integrity": "sha512-z3UiI2yi1mK0sXeRdc4O1Kk8aOa/e+FNWZcTiPB/dfTWyLypuE99LibgRaQki914Jq//yAWylcAt+mknKdixRQ==",
+      "optional": true
+    },
+    "node_modules/bare-path": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/bare-path/-/bare-path-2.1.3.tgz",
+      "integrity": "sha512-lh/eITfU8hrj9Ru5quUp0Io1kJWIk1bTjzo7JH1P5dWmQ2EL4hFUlfI8FonAhSlgIfhn63p84CDY/x+PisgcXA==",
+      "optional": true,
+      "dependencies": {
+        "bare-os": "^2.1.0"
+      }
+    },
+    "node_modules/bare-stream": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/bare-stream/-/bare-stream-2.3.2.tgz",
+      "integrity": "sha512-EFZHSIBkDgSHIwj2l2QZfP4U5OcD4xFAOwhSb/vlr9PIqyGJGvB/nfClJbcnh3EY4jtPE4zsb5ztae96bVF79A==",
+      "optional": true,
+      "dependencies": {
+        "streamx": "^2.20.0"
+      }
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
+    "node_modules/bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
+    "node_modules/buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "node_modules/buffer-equal-constant-time": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
       "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA=="
     },
+    "node_modules/chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg=="
+    },
+    "node_modules/color": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/color/-/color-4.2.3.tgz",
+      "integrity": "sha512-1rXeuUUiGGrykh+CeBdu5Ie7OJwinCgQY0bc7GCRxy5xVHy+moaqkpL/jqQq0MtQOeYcrqEz4abc5f0KtU7W4A==",
+      "dependencies": {
+        "color-convert": "^2.0.1",
+        "color-string": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=12.5.0"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+    },
+    "node_modules/color-string": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.9.1.tgz",
+      "integrity": "sha512-shrVawQFojnZv6xM40anx4CkoDP+fZsw/ZerEMsW/pyzsRbElpsL/DBVW7q3ExxwusdNXI3lXpuhEZkzs8p5Eg==",
+      "dependencies": {
+        "color-name": "^1.0.0",
+        "simple-swizzle": "^0.2.2"
+      }
+    },
+    "node_modules/debug": {
+      "version": "4.3.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.7.tgz",
+      "integrity": "sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/decompress-response": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-6.0.0.tgz",
+      "integrity": "sha512-aW35yZM6Bb/4oJlZncMH2LCoZtJXTRxES17vE3hoRiowU2kWHaJKFkSBDnDR+cm9J+9QhXmREyIfv0pji9ejCQ==",
+      "dependencies": {
+        "mimic-response": "^3.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/detect-libc": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.0.3.tgz",
+      "integrity": "sha512-bwy0MGW55bG41VqxxypOsdSdGqLwXPI/focwgTYCFMbdUiBAxLg9CFzG08sz2aqzknwiX7Hkl0bQENjg8iLByw==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/ecdsa-sig-formatter": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
@@ -68,6 +255,81 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "node_modules/end-of-stream": {
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
+      "integrity": "sha512-+uw1inIHVPQoaVuHzRyXd21icM+cnt4CzD5rW+NC1wjOUSTOs+Te7FOv7AhN7vS9x/oIyhLP5PR1H+phQAHu5Q==",
+      "dependencies": {
+        "once": "^1.4.0"
+      }
+    },
+    "node_modules/expand-template": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/expand-template/-/expand-template-2.0.3.tgz",
+      "integrity": "sha512-XYfuKMvj4O35f/pOXLObndIRvyQ+/+6AhODh+OKWj9S9498pHHn/IMszH+gt0fBCRWMNfk1ZSp5x3AifmnI2vg==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/fast-fifo": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/fast-fifo/-/fast-fifo-1.3.2.tgz",
+      "integrity": "sha512-/d9sfos4yxzpwkDkuN7k2SqFKtYNmCTzgfEpz82x34IM9/zc8KGxQoXg1liNC/izpRM/MBdt44Nmx41ZWqk+FQ=="
+    },
+    "node_modules/fs-constants": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
+      "integrity": "sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow=="
+    },
+    "node_modules/github-from-package": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/github-from-package/-/github-from-package-0.0.0.tgz",
+      "integrity": "sha512-SyHy3T1v2NUXn29OsWdxmK6RwHD+vkj3v8en8AOBZ1wBQ/hCAQ5bAQTD02kW4W9tUp/3Qh6J8r9EvntiyCmOOw=="
+    },
+    "node_modules/ieee754": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+      "integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
+    "node_modules/iiif-processor": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/iiif-processor/-/iiif-processor-4.0.7.tgz",
+      "integrity": "sha512-kY0CH4mr3miBcxl/afEX75ygRxQnr6CnbRu27tlmmKNiKfYBqkp18CVd0faeahU+HqvhNrk09+fcWwYaShnZrw==",
+      "dependencies": {
+        "debug": "^4.3.4",
+        "mime-types": "2.x",
+        "sharp": ">=0.25.2 <0.33.0"
+      }
+    },
+    "node_modules/inherits": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
+    },
+    "node_modules/ini": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
+      "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew=="
+    },
+    "node_modules/is-arrayish": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+      "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ=="
+    },
     "node_modules/jsonwebtoken": {
       "version": "9.0.2",
       "resolved": "https://registry.npmjs.org/jsonwebtoken/-/jsonwebtoken-9.0.2.tgz",
@@ -143,11 +405,75 @@
       "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
       "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg=="
     },
+    "node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/mime-types": {
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+      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.1.tgz",
+      "integrity": "sha512-x9v3H/lTKIJKQQe7RPQkLfKAnc9lUTkWDypIQgTzPJAq+5/GCDHonmshfvlsNSj58yyshbIJJDLmU15qNERrXQ=="
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
     }
   }
 }
diff --git a/iiif-server/src/package.json b/iiif-server/src/package.json
index 8316f0f..8501bd6 100644
--- a/iiif-server/src/package.json
+++ b/iiif-server/src/package.json
@@ -8,6 +8,7 @@
   "dependencies": {
     "@middy/core": "4.6.4",
     "@middy/secrets-manager": "4.6.4",
+    "iiif-processor": "^4.0.7",
     "jsonwebtoken": "^9.0.2",
     "lodash.isstring": "^4.0.1",
     "node-fetch": "^2.3.0"
diff --git a/iiif-server/src/validate-jwt.js b/iiif-server/src/validate-jwt.js
new file mode 100644
index 0000000..1f0b312
--- /dev/null
+++ b/iiif-server/src/validate-jwt.js
@@ -0,0 +1,86 @@
+const { S3Client, HeadObjectCommand } = require("@aws-sdk/client-s3");
+const IIIF = require('iiif-processor');
+
+async function validateJwtClaims(jwtClaims, params, config) {
+  console.log("Validating JWT claims");
+  const currentTime = Math.floor(Date.now() / 1000);
+
+  if (jwtClaims.exp <= currentTime) {
+    return { valid: false, reason: "Token expired" }
+  }
+
+  if (jwtClaims.sub !== params.id) {
+    return { valid: false, reason: "ID mismatch" }
+  }
+
+  const fields = ['region', 'size', 'rotation', 'quality', 'format'];
+  for (const field of fields) {
+    if (jwtClaims[field] && !jwtClaims[field].includes(params[field])) {
+      return { valid: false, reason: `${field} mismatch` }
+    }
+  }
+
+  if (jwtClaims['max-width'] || jwtClaims['max-height']) {
+    const dimensions = await s3Dimensions(config.tiffBucket, s3Key(params));
+
+    if (dimensions) {
+      const Calculator = IIIF.Versions[params.version].Calculator;
+      const calculator = new Calculator(dimensions);
+
+      calculator
+        .region(params.region)
+        .size(params.size)
+        .rotation(params.rotation)
+        .quality(params.quality)
+        .format(params.format);
+
+      const requestedDimensions = calculator.info().fullSize;
+
+      if (requestedDimensions.width > jwtClaims['max-width']) {
+        return { valid: false, reason: "Exceeds max-width" }
+      }
+
+      if (requestedDimensions.height > jwtClaims['max-height']) {
+        return { valid: false, reason: "Exceeds max-height" }
+      }
+    }
+  }
+
+  return { valid: true };
+}
+
+async function s3Dimensions(bucket, key) {
+  const input = {
+    "Bucket": bucket,
+    "Key": key
+  }
+  try {
+    const s3 = new S3Client();
+    const cmd = new HeadObjectCommand(input);
+    const response = await s3.send(cmd);
+    const { Metadata } = response;
+    if (Metadata.width && Metadata.height) {
+      return {
+        width: parseInt(Metadata.width, 10),
+        height: parseInt(Metadata.height, 10)
+      };
+    } else {
+      console.log("Missing width and height metadata in S3 object");
+      return null;
+    }
+  } catch (err) {
+    console.log("Error fetching S3 object metadata");
+    console.log(err);
+    return null;
+  }
+}
+
+function s3Key(params) {
+  const pairtree = params.id.match(/.{1,2}/g).join("/");
+
+  return params.poster
+    ? `posters/${pairtree}-poster.tif`
+    : `${pairtree}-pyramid.tif`;
+}
+
+module.exports = validateJwtClaims
\ No newline at end of file
diff --git a/iiif-server/template.yaml b/iiif-server/template.yaml
index de5f55c..77629f2 100644
--- a/iiif-server/template.yaml
+++ b/iiif-server/template.yaml
@@ -72,6 +72,17 @@ Resources:
                 - lambda.amazonaws.com
             Action:
               - 'sts:AssumeRole'
+      Policies:
+        Version: 2012-10-17
+        Statement:
+          - Sid: PyramidBucketAccess
+            Effect: Allow
+            Action:
+              - s3:ListBucket
+              - s3:GetObject
+            Resource: 
+              - !Sub "arn:aws:s3:::${SourceBucket}"
+              - !Sub "arn:aws:s3:::${SourceBucket}/*"
   ViewerRequestSecret:
     Type: AWS::SecretsManager::Secret
     Properties:
@@ -100,7 +111,7 @@ Resources:
   ConfigurationSecret:
     Type: AWS::SecretsManager::Secret
     Properties:
-      Name: !Sub "${Namespace}/iiif-url"
+      Name: !Sub "${Namespace}/infrastructure/iiif"
       SecretString:
         Fn::ToJsonString:
           base: !Sub "https://${Hostname}.${DomainName}/"