Downloads all of your Amazon Alexa audio files to disk

download-alexa-audio.sh

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#
# Downloads all of your alexa audio files to `output_dir` with the filenames
# flattened (vs storing as sub-directories as implied by the file name).
# 
# For example, the following id:
#  - A3S5CH1HU6KAYF:1.0/2019/01/18/17/G090LF1174270LM2/39:31::TNIH_2V.6c04473c-3160-4012-9719-63ca63396288ZXK
# Will be saved to:
#  - ${output_dir}/A3S5CH1HU6KAYF_1_0_2019_01_18_17_G090LF1174270LM2_39_31__TNIH_2V_6c04473c-3160-4012-9719-63ca63396288ZXK.wav
# 
# Configure:
#  - Change `update_dir` to match your needs.
#  - Go to https://alexa.amazon.com and login if needed. 
#  - Get the value for the request header "Cookie" made to alexa.amazon.com and paste it into `cookie_str` below.
#    Note that the only cookie keys that are absolutely *required* are:
#     - ubid
#     - x-main
#     - at-main
#     - sess-at-main
# 
# Caveats:
#  - Only tested on Mac
#
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# Where to store the resulting downloads (it *will* be created!)
output_dir=~/Desktop/my-alexa-files
mkdir -p ${output_dir}

cookie_str=''

api_endpoint=https://alexa.amazon.com/api

# Makes an alexa api request
# $1 = api endpoint
# $2 = where to save the result
api_request() {
    $(curl \
        -H "Connection: keep-alive" \
        -H "Pragma: no-cache" \
        -H "Cache-Control: no-cache" \
        -H "Upgrade-Insecure-Requests: 1" \
        -H "Accept: application/json" \
        -H "Accept-Encoding: gzip, deflate, br" \
        -H "Accept-Language: en-US,en" \
        -H "Cookie: ${cookie_str}" \
        --compressed \
        --silent \
        -o ${2} \
        "${1}")
}

fetch() {
    url="${api_endpoint}/activities-with-range?startTime=$1&endTime=$2&size=50&_=$3"
    api_request $url "/tmp/$3"
    ids=$(cat /tmp/$3 | jq -r .activities[].utteranceId)
    for id in $ids; do
        # Flatten the name instead of putting in subdirectories for easier sorting
        flattened_id=`echo ${id} | tr :./ _`
        api_request "${api_endpoint}/utterance/audio/data?id=${id}" "/tmp/${flattened_id}"
        dst="${output_dir}/${flattened_id}.wav"
        echo $dst
        cp "/tmp/${flattened_id}" ${dst}
    done
}

main() {
    # November 14, 2014 12:00:00 AM
    # When the first Alexa came out: https://en.wikipedia.org/wiki/Amazon_Alexa#History
    start_time_ms=1415923200000
    # Batches of 100 hours
    hours_ms=$(( 100 * 60 * 60 * 1000 ))

    tick=$(date +'%s')
    next_end_time_ms=$(( `date +'%s'` * 1000 ))
    fetch $start_time_ms $next_end_time_ms $tick

    while (( $next_end_time_ms > $start_time_ms )); do
        tick=$(( $(date +'%s') + 1 ))
        next_end_time_ms=$(( $next_end_time_ms - $hours_ms ))
        fetch $start_time_ms $next_end_time_ms $tick
    done
}

main