Feat: add script to strip metadata from a PDF file

README.md

@@ -42,6 +42,8 @@ This repository holds shell scripts that Intersect uses to engage in Cardano on-
 
 - [hash.sh](./scripts/hash.sh)
   - Performs a blake2b-256 hash on provided file
+- [pdf-remove-metadata.sh](./scripts/pdf-remove-metadata.sh)
+  - Removes PDF metadata from PDF files  
 
 ### Documentation
 

scripts/author-create.sh

@@ -51,7 +51,6 @@ while [[ $# -gt 0 ]]; do
             new_file="true"
             shift
             ;;
-
         -h|--help)
             usage
             ;;

scripts/pdf-remove-metadata.sh

@@ -0,0 +1,86 @@
+#!/bin/bash
+
+##################################################
+DEFAULT_NEW_FILE="false" # default to false, to the script overwrites the input file
+##################################################
+
+# Exit immediately if a command exits with a non-zero status, 
+# treat unset variables as an error, and fail if any command in a pipeline fails
+set -euo pipefail
+
+# check if user has exiftool cli installed
+if ! command -v exiftool >/dev/null 2>&1; then
+  echo "Error: exiftool cli is not installed or not in your PATH." >&2
+  exit 1
+fi
+
+# check if user has qpdf cli installed
+if ! command -v qpdf >/dev/null 2>&1; then
+  echo "Error: qpdf cli is not installed or not in your PATH." >&2
+  exit 1
+fi
+
+# Usage message
+usage() {
+    echo "Usage: $0 <pdf-file> [--new-file]"
+    echo "Remove all metadata from a PDF file and set the Title metadata to the filename."
+    echo "  "
+    echo "Options:"
+    echo "  <pdf-file>            Path to your PDF file."
+    echo "  --new-file            Create a new file with the signed metadata (default: $DEFAULT_NEW_FILE)"
+    exit 1
+}
+
+# Initialize variables with defaults
+input_path=""
+new_file="$DEFAULT_NEW_FILE"
+
+# Parse command line arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --new-file)
+            new_file="true"
+            shift
+            ;;
+        -h|--help)
+            usage
+            ;;
+        *)
+            if [ -z "$input_path" ]; then
+                input_path="$1"
+            fi
+            shift
+            ;;
+    esac
+done
+
+# Check for required arguments
+if [ -z "$input_path" ]; then
+    echo "Error: Could not find PDF file."
+    usage
+fi
+
+# Extract filename without extension
+BASENAME=$(basename "$input_path" .pdf)
+
+# could add some logic here
+TITLE=$(echo "$BASENAME")
+
+if [ "$new_file" = "true" ]; then
+    output_new_file="$input_path-new-metadata.pdf"
+    # remove all metadata from the original PDF and create a new PDF
+    exiftool -all= "$input_path" -o "$output_new_file"
+    # remove all hidden metadata
+    qpdf --linearize "$input_path" --replace-input
+    # add the Title metadata to the new PDF
+    exiftool -Title="$TITLE" "$output_new_file" -overwrite_original_in_place
+    echo "Metadata processing completed. New file: $output_new_file with Title: $TITLE"
+else
+    # remove all metadata from the original PDF
+    exiftool -all= "$input_path" -overwrite_original_in_place
+    # remove all hidden metadata from the original PDF
+    qpdf --linearize "$input_path" --replace-input
+    # add the Title metadata to the original PDF
+    exiftool -Title="$TITLE" "$input_path" -overwrite_original_in_place
+    echo "Metadata processing completed. Your file: $input_path now only has a Title: $TITLE"
+fi