remove pdf dependency and replace with pdftotext...

server/pdfhelpers.go

@@ -0,0 +1,120 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func isScannedPDF(path string) (bool, error) {
+	content, _, err := extractTextFromPDF(path)
+	if err != nil {
+		return false, err
+	}
+	return len(strings.TrimSpace(string(content))) != 0, nil
+}
+
+func runOCRMyPDF(inputPath string) error {
+	tempfile, err := os.CreateTemp("", "temp-ocr-*.pdf")
+	defer os.Remove(tempfile.Name())
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command("ocrmypdf", "--skip-text", inputPath, tempfile.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("ocrmypdf failed: %v\nOutput: %s", err, output)
+	}
+
+	processedData, err := os.ReadFile(tempfile.Name())
+	if err != nil {
+		return fmt.Errorf("failed to read processed file: %v", err)
+	}
+
+	err = os.WriteFile(inputPath, processedData, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to overwrite input file: %v", err)
+	}
+	return nil
+}
+
+func isEncrypted(pdfPath string) bool {
+	cmd := exec.Command("qpdf", "--check", pdfPath)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return strings.Contains(string(output), "File is not encrypted")
+	}
+	return false
+}
+
+func repairPDF(inputPath string) error {
+	tempfile, err := os.CreateTemp("", "")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tempfile.Name())
+
+	cmd := exec.Command("qpdf", "--repair", inputPath, tempfile.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return err
+	}
+
+	_, err = tempfile.Write(output)
+
+	return err
+}
+
+func decryptPDF(inputPath string) error {
+	tempfile, err := os.CreateTemp("", "")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tempfile.Name())
+
+	cmd := exec.Command("qpdf", "--decrypt", inputPath, tempfile.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("qpdf failed: %v\nOutput: %s", err, output)
+	}
+
+	processedData, err := os.ReadFile(tempfile.Name())
+	if err != nil {
+		return fmt.Errorf("failed to read processed file: %v", err)
+	}
+
+	err = os.WriteFile(inputPath, processedData, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to overwrite input file: %v", err)
+	}
+	return nil
+}
+
+func extractTextFromPDF(path string) (string, []byte, error) {
+
+	tmpOut, err := os.CreateTemp("", "pdftotext-*.txt")
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to create temp file: %w", err)
+	}
+	tmpOut.Close()
+	defer os.Remove(tmpOut.Name())
+
+	cmd := exec.Command("pdftotext", path, tmpOut.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return "", nil, fmt.Errorf("pdftotext failed: %v\nOutput: %s", err, output)
+	}
+
+	data, err := os.ReadFile(tmpOut.Name())
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to read pdftotext output: %w", err)
+	}
+
+	rawData, err := os.ReadFile(path)
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to read raw PDF file: %w", err)
+	}
+
+	return string(data), rawData, nil
+}