sync & async api

README.md

@@ -2,12 +2,54 @@
 
 This is the development repository for the new StirlingPDF backend. With the power of JS, WASM & GO this will provide almost all functionality SPDF can do currently directly on the client. For automation purposes this will still provide an API to automate your workflows.
 
-## New/Planned Features
+## Features
 
-- Propper auth using passportjs
+### New
-- Workflows & Node based editing of them.
+
-- Client side PDF-Manipulation
+[ ] Propper auth using passportjs
-- Stateful UI
+[x] Workflows
+[ ] Node based editing of them.
+[x] Client side PDF-Manipulation
+[ ] Stateful UI
+
+### Functions
+
+Current functions of spdf and their progress in this repo.
+
+[x] Merge
+[x] Split
+[x] Rotate
+[x] Multi-Page-Layout
+[x] Adjust page size/scale
+[ ] Organize
+[ ] Change Metadata
+[ ] Add Watermark
+
+[ ] Remove Pages
+[ ] Remove Blank Pages
+[ ] Detect/Split Scanned photos
+
+[ ] Repair
+[ ] Compress
+[ ] Flatten
+[ ] Compare/Diff
+
+[ ] Sign
+[ ] Sign with Certificate
+[ ] Add Password
+[ ] Remove Password
+[ ] Change Permissions
+
+[ ] Image to PDF
+[ ] Add image
+[ ] Extract Images
+[ ] PDF to Image
+[ ] OCR
+
+[ ] Convert file to PDF
+[ ] PDF to Text/RTF
+[ ] PDF to HTML
+[ ] PDF to XML
 
 ## Contribute
 

api/index.js

@@ -1 +0,0 @@
-// TODO: Make API endpoints available

index.js

@@ -1,4 +1,6 @@
 
+import api from './routes/api/index.js';
+
 import express from 'express';
 const app = express();
 const PORT = 8080;
@@ -10,7 +12,7 @@ app.get('/', function (req, res, next) { // TODO: Use EJS?
     res.render('home.ejs');
 });
 
-// TODO: Import and server /api
+app.use("/api/", api);
  
 app.listen(PORT, function (err) {
     if (err) console.log(err);

package-lock.json

@@ -4,6 +4,32 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@pdf-lib/standard-fonts/-/standard-fonts-1.0.0.tgz",
+      "integrity": "sha512-hU30BK9IUN/su0Mn9VdlVKsWBS6GyhVfqjwl1FjZN4TxP6cCw0jP2w7V3Hf5uX7M0AZJ16vey9yE0ny7Sa59ZA==",
+      "requires": {
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+      }
+    },
+    "@pdf-lib/upng": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@pdf-lib/upng/-/upng-1.0.1.tgz",
+      "integrity": "sha512-dQK2FUMQtowVP00mtIksrlZhdFXQZPC+taih1q4CvPZ5vqdxR/LKBaFg0oAfzd1GlHZXXSPdQfzQnt+ViGvEIQ==",
+      "requires": {
+        "pako": "^1.0.10"
+      }
+    },
+    "@wasmer/wasmfs": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/@wasmer/wasmfs/-/wasmfs-0.12.0.tgz",
+      "integrity": "sha512-m1ftchyQ1DfSenm5XbbdGIpb6KJHH5z0gODo3IZr6lATkj4WXfX/UeBTZ0aG9YVShBp+kHLdUHvOkqjy6p/GWw==",
+      "requires": {
+        "memfs": "3.0.4",
+        "pako": "^1.0.11",
+        "tar-stream": "^2.1.0"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -13,11 +39,31 @@
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       }
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-field/-/append-field-1.0.0.tgz",
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+    },
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     },
+    "base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="
+    },
+    "bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "requires": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
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@@ -37,6 +83,28 @@
         "unpipe": "1.0.0"
       }
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+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "requires": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
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+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/busboy/-/busboy-1.6.0.tgz",
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+        "streamsearch": "^1.1.0"
+      }
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       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -51,6 +119,46 @@
         "get-intrinsic": "^1.0.2"
       }
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+    "concat-stream": {
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+      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.2.tgz",
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+        "inherits": "^2.0.3",
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+          "requires": {
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+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
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+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "content-disposition": {
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       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
@@ -74,6 +182,11 @@
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       "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
     },
+    "core-util-is": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ=="
+    },
     "debug": {
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       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -102,6 +215,14 @@
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     },
+    "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==",
+      "requires": {
+        "once": "^1.4.0"
+      }
+    },
     "escape-html": {
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       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -150,6 +271,11 @@
         "vary": "~1.1.2"
       }
     },
+    "fast-extend": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/fast-extend/-/fast-extend-1.0.2.tgz",
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@@ -174,6 +300,16 @@
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     },
+    "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=="
+    },
+    "fs-monkey": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/fs-monkey/-/fs-monkey-0.3.3.tgz",
+      "integrity": "sha512-FNUvuTAJ3CqCQb5ELn+qCbGR/Zllhf2HtwsdAtBi59s1WeCjKMT81fHcSu7dwIskqGVK+MmOrb7VOBlq3/SItw=="
+    },
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@@ -225,6 +361,11 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
     },
+    "ieee754": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+      "integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA=="
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@@ -235,11 +376,25 @@
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
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     },
+    "memfs": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/memfs/-/memfs-3.0.4.tgz",
+      "integrity": "sha512-OcZEzwX9E5AoY8SXjuAvw0DbIAYwUzV/I236I8Pqvrlv7sL/Y0E9aRCon05DhaV8pg1b32uxj76RgW0s5xjHBA==",
+      "requires": {
+        "fast-extend": "1.0.2",
+        "fs-monkey": "0.3.3"
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@@ -268,16 +423,48 @@
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       }
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+    "minimist": {
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+      "requires": {
+        "minimist": "^1.2.6"
+      }
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+    "multer": {
+      "version": "1.4.5-lts.1",
+      "resolved": "https://registry.npmjs.org/multer/-/multer-1.4.5-lts.1.tgz",
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+      "requires": {
+        "append-field": "^1.0.0",
+        "busboy": "^1.0.0",
+        "concat-stream": "^1.5.2",
+        "mkdirp": "^0.5.4",
+        "object-assign": "^4.1.1",
+        "type-is": "^1.6.4",
+        "xtend": "^4.0.0"
+      }
+    },
     "negotiator": {
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       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
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     },
+    "object-assign": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+      "integrity": "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg=="
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@@ -291,6 +478,19 @@
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       }
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+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==",
+      "requires": {
+        "wrappy": "1"
+      }
+    },
+    "pako": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
+      "integrity": "sha512-4hLB8Py4zZce5s4yd9XzopqwVv/yGNhV1Bl8NTmCq1763HeK2+EwVTv+leGeL13Dnh2wfbqowVPXCIO0z4taYw=="
+    },
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@@ -301,6 +501,22 @@
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+    "pdf-lib": {
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+      "resolved": "https://registry.npmjs.org/pdf-lib/-/pdf-lib-1.17.1.tgz",
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+      "requires": {
+        "@pdf-lib/standard-fonts": "^1.0.0",
+        "@pdf-lib/upng": "^1.0.1",
+        "pako": "^1.0.11",
+        "tslib": "^1.11.1"
+      }
+    },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
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+    },
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@@ -334,6 +550,16 @@
         "unpipe": "1.0.0"
       }
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+      "requires": {
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+    "streamsearch": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/streamsearch/-/streamsearch-1.1.0.tgz",
+      "integrity": "sha512-Mcc5wHehp9aXz1ax6bZUyY5afg9u2rv5cqQI3mRrYkGC8rW2hM02jWuwjtL++LS5qinSyhj2QfLyNsuc+VsExg=="
+    },
+    "string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "requires": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "requires": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      }
+    },
     "toidentifier": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
       "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
     },
+    "tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
+    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -416,11 +672,21 @@
         "mime-types": "~2.1.24"
       }
     },
+    "typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha512-/aCDEGatGvZ2BIk+HmLf4ifCJFwvKFNb9/JeZPMulfgFracn9QFcAf5GO8B/mweUjSoblS5In0cWhqpfs/5PQA=="
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
       "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ=="
     },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
+    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -430,6 +696,16 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
+    },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     }
   }
 }

package.json

@@ -9,7 +9,10 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "express": "^4.18.2"
+    "@wasmer/wasmfs": "^0.12.0",
+    "express": "^4.18.2",
+    "multer": "^1.4.5-lts.1",
+    "pdf-lib": "^1.17.1"
   },
   "type": "module"
 }

routes/api/index.js

@@ -0,0 +1,12 @@
+import express from 'express';
+import workflow from './workflow.js';
+
+const router = express.Router();
+
+router.get("/", function (req, res, next) {
+    res.status(501).json({"Error": "Unfinished Endpoint"});
+});
+
+router.use("/workflow", workflow);
+
+export default router;

routes/api/workflow.js

@@ -0,0 +1,125 @@
+import express from 'express';
+import multer from 'multer';
+import crypto from 'crypto';
+import stream from "stream";
+
+import { traverseOperations } from "../../traverseOperations.js";
+
+const activeWorkflows = {};
+
+const router = express.Router();
+
+router.post("/", [
+    multer().array("files"),
+    async (req, res, next) => {
+        const workflow = JSON.parse(req.body.workflow);
+        console.log("fileCount: ", req.files.length);
+        console.log("workflow: ", workflow);
+
+        // TODO: Validate
+
+        let workflowID = undefined;
+
+        const inputs = await Promise.all(req.files.map(async file => {
+            console.log(file);
+            return {
+                originalFileName: file.originalname.replace(/\.[^/.]+$/, ""),
+                fileName: file.originalname.replace(/\.[^/.]+$/, ""),
+                buffer: new Uint8Array(await file.buffer)
+            }
+        }));
+
+        // Allow option to do it synchronously and just make a long request
+        if(req.body.async === "false") {
+            console.log("Don't do async");
+
+            const pdfResults = await traverseOperations(workflow.operations, inputs);
+            downloadHandler(res, pdfResults);
+        }
+        else {
+            workflowID = generateWorkflowID();
+            activeWorkflows[workflowID] = {
+                createdAt: Date.now(),
+                finished: false, 
+                eventStream: null,
+                result: null,
+                // TODO: When auth is implemented: owner
+            }
+
+            res.status(501).json({
+                "warning": "Unfinished Endpoint",
+                "workflowID": workflowID,
+                "data-recieved": {
+                    "fileCount": req.files.length,
+                    "workflow": workflow
+                }
+            });
+
+            traverseOperations(workflow.operations, inputs).then((pdfResults) => {
+                activeWorkflows[workflowID].result = pdfResults;
+                activeWorkflows[workflowID].finished = true;
+                // TODO: Post to eventStream
+            });
+        }
+    }
+]);
+
+router.get("/progress/:workflowUuid", (req, res, nex) => {
+    // TODO: Validation
+
+    // Return current progress
+    const workflow = activeWorkflows[req.params.workflowUuid];
+    res.status(200).json({ createdAt: workflow.createdAt, finished: workflow.finished });
+});
+
+router.get("/progress-stream/:workflowUuid", (req, res, nex) => {
+    // TODO: Send realtime updates
+    res.status(501).json({"warning": "Event-Stream has not been implemented yet."});
+});
+
+router.get("/result/:workflowUuid", (req, res, nex) => {
+    // TODO: Validation
+
+    /* 
+     * If workflow isn't done return error
+     * Send file, TODO: if there are multiple outputs return as zip
+     * If download is done, delete results / allow deletion within the next 5-60 mins
+    */
+    const workflow = activeWorkflows[req.params.workflowUuid];
+    if(!workflow.finished) {
+        res.status(202).json({ message: "Workflow hasn't finished yet. Check progress or connect to progress-steam to get notified when its done." });
+        return
+    }
+
+    downloadHandler(res, workflow.result);
+    // Delete workflow / results when done.
+    delete activeWorkflows[req.params.workflowUuid];
+});
+
+router.post("/abort/:workflowUuid", (req, res, nex) => {
+    // TODO: Abort workflow
+    res.status(501).json({"warning": "Abortion has not been implemented yet."});
+});
+
+function generateWorkflowID() {
+    return crypto.randomUUID();
+}
+
+function downloadHandler(res, pdfResults) {
+    if(pdfResults.length > 1) {
+        res.status(501).json({"warning": "The workflow had multiple outputs, this is not implemented yet."});
+        // TODO: Implement ZIP
+    }
+    else {
+        const readStream = new stream.PassThrough();
+        readStream.end(pdfResults[0].buffer);
+
+        // TODO: Implement other file types (mostly fro image & text extraction)
+        res.set("Content-disposition", 'attachment; filename=' + pdfResults[0].fileName + ".pdf");
+        res.set("Content-Type", "application/pdf");
+
+        readStream.pipe(res);
+    }
+}
+
+export default router;

traverseOperations.js

@@ -0,0 +1,206 @@
+import { extractPages } from "./functions/extractPages.js";
+import { impose } from "./functions/impose.js";
+import { mergePDFs } from "./functions/mergePDFs.js";
+import { rotatePages } from "./functions/rotatePDF.js";
+import { splitPDF } from "./functions/splitPDF.js";
+import { organizeWaitOperations } from "./public/organizeWaitOperations.js";
+
+export async function traverseOperations(operations, input) {
+    const waitOperations = organizeWaitOperations(operations);
+    const results = [];
+    await nextOperation(operations, input);
+    return results;
+
+    async function nextOperation(operations, input) {
+        if(Array.isArray(operations) && operations.length == 0) { // isEmpty
+            console.log("operation done: " + input.fileName);
+            results.push(input);
+            return;
+        }
+    
+        for (let i = 0; i < operations.length; i++) {
+            await computeOperation(operations[i], structuredClone(input)); // break references
+        }
+    }
+    
+    async function computeOperation(operation, input) {
+        switch (operation.type) {
+            case "done":
+                console.log("Done operation will get called if all waits are done. Skipping for now.")
+                break;
+            case "wait":
+                const waitOperation = waitOperations[operation.values.id];
+                waitOperation.input.push(input);
+                waitOperation.waitCount--;
+                if(waitOperation.waitCount == 0) {
+                    await nextOperation(waitOperation.doneOperation.operations, waitOperation.input);
+                }
+                break;
+            case "removeObjects":
+                console.warn("RemoveObjects not implemented yet.")
+
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        // TODO: modfiy input
+                        input[i].fileName += "_removedObjects";
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    // TODO: modfiy input
+                    input.fileName += "_removedObjects";
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "extract":
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        input[i].fileName += "_extractedPages";
+                        input[i].buffer = await extractPages(input[i].buffer, operation.values["pagesToExtractArray"]);
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    input.fileName += "_extractedPages";
+                    input.buffer = await extractPages(input.buffer, operation.values["pagesToExtractArray"]);
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "split":
+                // TODO: When a split goes into a wait function it might break the done condition, as it will count multiplpe times.
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        const splits = await splitPDF(input[i].buffer, operation.values["pagesToSplitAfterArray"]);
+
+                        for (let j = 0; j < splits.length; j++) {
+                            const split = {};
+                            split.originalFileName = input[i].originalFileName;
+                            split.fileName = input[i].fileName + "_split";
+                            split.buffer = splits[j];
+                            await nextOperation(operation.operations, split);
+                        }
+                    }
+                }
+                else {
+                    const splits = await splitPDF(input.buffer, operation.values["pagesToSplitAfterArray"]);
+
+                    for (let j = 0; j < splits.length; j++) {
+                        const split = {};
+                        split.originalFileName = input.originalFileName;
+                        split.fileName = input.fileName + "_split";
+                        split.buffer = splits[j];
+                        await nextOperation(operation.operations, split);
+                    }
+                }
+                break;
+            case "fillField":
+                console.warn("FillField not implemented yet.")
+
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        // TODO: modfiy input
+                        input[i].fileName += "_filledField";
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    // TODO: modfiy input
+                    input.fileName += "_filledField";
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "extractImages":
+                console.warn("ExtractImages not implemented yet.")
+
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        // TODO: modfiy input
+                        input[i].fileName += "_extractedImages";
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    // TODO: modfiy input
+                    input.fileName += "_extractedImages";
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "merge":
+                if(Array.isArray(input) && input.length > 1) {
+                    const inputs = input;
+                    input = {
+                        originalFileName: inputs.map(input => input.originalFileName).join("_and_"),
+                        fileName: inputs.map(input => input.fileName).join("_and_") + "_merged",
+                        buffer: await mergePDFs(inputs.map(input => input.buffer))
+                    }
+                }
+                else {
+                    // Only one input, no need to merge
+                    input.fileName += "_merged";
+                }
+                await nextOperation(operation.operations, input);
+                break;
+            case "transform": {
+                console.warn("Transform not implemented yet.")
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        // TODO: modfiy input
+                        input[i].fileName += "_transformed";
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    // TODO: modfiy input
+                    input.fileName += "_transformed";
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            }
+            case "extract":
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        input[i].fileName += "_extractedPages";
+                        input[i].buffer = await extractPages(input[i].buffer, operation.values["pagesToExtractArray"]);
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    input.fileName += "_extractedPages";
+                    input.buffer = await extractPages(input.buffer, operation.values["pagesToExtractArray"]);
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "rotate":
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        input[i].fileName += "_turned";
+                        input[i].buffer = await rotatePages(input[i].buffer, operation.values["rotation"]);
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    input.fileName += "_turned";
+                    input.buffer = await rotatePages(input.buffer, operation.values["rotation"]);
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            case "impose":
+                if(Array.isArray(input)) {
+                    for (let i = 0; i < input.length; i++) {
+                        input[i].fileName += "_imposed";
+                        input[i].buffer = await impose(input[i].buffer, operation.values["nup"], operation.values["format"]);
+                        await nextOperation(operation.operations, input[i]);
+                    }
+                }
+                else {
+                    input.fileName += "_imposed";
+                    input.buffer = await impose(input.buffer, operation.values["nup"], operation.values["format"]);
+                    await nextOperation(operation.operations, input);
+                }
+                break;
+            default:
+                console.log("operation type unknown: ", operation.type);
+                break;
+        }
+    }
+}