Add PDF upload with text extraction for Finnish learning content

[Copilot]

Currently, content can only be loaded by pasting text or selecting preloaded markdown files. This adds PDF upload capability with automatic text extraction and reformatting.

Changes

API & Processing

• /api/pdf-upload endpoint handles file uploads with validation (10MB max file size, 100K max text length)
• PDF text extraction via pdf-parse with reformatting logic:
  • Fixes hyphenated line breaks using \S+ regex (supports Finnish diacritics: ä, ö, å)
  • Normalizes whitespace and line endings
  • Preserves paragraph structure

UI

• Tab interface in ContentSelector: "Content Library" | "Upload PDF"
• PdfUploader component with drag-and-drop support
• Client-side validation with error states

Configuration

• All limits centralized in src/config/constants.ts:

export const PDF_UPLOAD_LIMITS = {
    MAX_FILE_SIZE_MB: 10,
    MAX_FILE_SIZE_BYTES: 10 * 1024 * 1024,
    MAX_TEXT_LENGTH: 100000,
    ALLOWED_MIME_TYPES: ['application/pdf'] as const,
} as const;

Screenshot

Dependencies

• pdf-parse@1.1.1 - PDF text extraction (no known vulnerabilities)
• @types/pdf-parse - TypeScript definitions

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node /usr/local/bin/node /home/REDACTED/work/finnish-learner/finnish-learner/node_modules/next/dist/compiled/jest-worker/processChild.js (dns block)
  • Triggering command: /usr/local/bin/node /usr/local/bin/node /home/REDACTED/work/finnish-learner/finnish-learner/node_modules/next/dist/server/lib/start-server.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add ability to upload pdf and get content from there</issue_title>
<issue_description>Currently only way to get content to read/learn only from copying text or selecting already preloaded content. i want to enhance this feature by giving ability to get text from pdf document.
So app should be able to copy text, reformat it to make it suitable for app to read

Also consider about size of the file and other major scenarios, which make app crash or something. Add relacant limitation and keep them in constant file where they can calibrate in future</issue_description>

<agent_instructions>keep the implementation neat and properly seperated by not overly complicated</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add ability to upload pdf and get content from there #6

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Project	Deployment	Review	Updated (UTC)
finnish-learner	Error		Jan 19, 2026 2:38pm