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| import sharp from 'sharp' | |
| const MAX_DIMENSION = 1800 | |
| const JPEG_QUALITY = 80 | |
| // Shared by every image-ingestion entry point (slip queue, payment-slip | |
| // reconciliation, ad-hoc expense parsing) — runs before any LLM call and | |
| // before any persistence. sharp strips EXIF on re-encode by default, which | |
| // also drops embedded GPS data as a privacy side-benefit. | |
| export async function compressImage(base64: string): Promise<string> { | |
| const inputBuffer = Buffer.from(base64, 'base64') | |
| const outputBuffer = await sharp(inputBuffer) | |
| .resize(MAX_DIMENSION, MAX_DIMENSION, { fit: 'inside', withoutEnlargement: true }) | |
| .jpeg({ quality: JPEG_QUALITY }) | |
| .toBuffer() | |
| return outputBuffer.toString('base64') | |
| } | |
| // Cheap real-image check — reads only the header (via sharp's metadata | |
| // probe), not the full pixel data, so it's far cheaper than compressImage. | |
| // Used at enqueue time now that compression itself has moved to after OCR | |
| // succeeds (see slip-queue.service.ts), so something still rejects a | |
| // non-image upload immediately instead of silently queuing it. | |
| export async function validateImage(base64: string): Promise<void> { | |
| await sharp(Buffer.from(base64, 'base64')).metadata() | |
| } | |