extract ChatGTP aac audio from Chrome's .har files

getGPTune.sh

#!/bin/bash

# Check if there are any .har files in the current directory
har_files=$(echo *.har)
if [ -z "$har_files" ] || [ "$har_files" = "*.har" ]; then
    echo "No .har files found."
    exit 1
fi

# Iterate over all .har files in the current directory
for file in *.har; do
    # Check if the file actually exists
    if [ ! -f "$file" ]; then
        echo "File not found: $file"
        exit 1
    fi

    # Extract the filename without the extension
    base_name=$(basename "$file" .har)

    # Initialize an empty string to accumulate all base64 strings
    full_base64_string=""

    # Extract and concatenate all Base64 strings
    while IFS= read -r line; do
        full_base64_string+="$line"
    done < <(jq -r '.log.entries[] | select(.response.content.mimeType == "audio/aac") | .response.content.text' "$file")

    # Check if the full Base64 string is empty
    if [ -z "$full_base64_string" ]; then
        echo "No AAC content found in $file"
        continue # Skip this file but don't stop the whole script
    fi

    # Decode the concatenated Base64 string and save it to a file
    echo "$full_base64_string" | base64 -d > "${base_name}.aac"

    # Remove the original .har file
    rm "$file"
done

Usage:

• let ChatGPT generate a text
• open Chrome's network tab (F12), filter for "synthesize"
• click "Read Aloud", wait until the request has finished loading
• right click synthesize?message_id=[...] select "Save all as HAR with content"
• save the file to the same folder as the script and run it ./getGPTune.sh