#!/bin/bash

source /opt/aninix/Uniglot/Bash/header

unset canaryText
# cscanary=https://cryptostorm.is/canary.txt
# cskeyserver=pgp.mit.edu
# cskey=E9C7C942
keyserver=pool.sks-keyservers.net
key=1CC1E3F4ED06F296
canary=https://aninix.net/AniNIX/WarrantCanary/raw/branch/main/canary.asc
unset gitCommit
alJazeera='https://www.aljazeera.com/xml/rss/all.xml'
alJazeeraDate="$(date +%Y/%m/%d | sed -s 's#/0#/#g')"
npr='https://feeds.npr.org/1004/rss.xml'
nprdate="$(date +%Y/%m/%d)"

function Usage() { 
    # Show helptext
    # param retcode: what to exit
    retcode=$1
    echo "Usage: $0 -V                               # Verify the AniNIX's warrant canary"
    echo "       $0 -V -k KEY -K KEYSERVER -c CANARY # Verify another warrant canary"
    echo "       $0 -s                               # Seed a warrant canary."
    echo "Add -v to increase verbosity."
    exit $retcode
}


function ConfirmGPGKeys() { 
    # Try to make sure we either have or can pull the key
    if ! gpg2 --fingerprint "$key"; then
        gpg --keyserver "$keyserver" --recv-key "$key"
        if ! gpg2 --fingerprint "$key"; then
            echo Cannot pull the key: "$key".
            exit 1;
        fi
    fi
}

function RecentNews() {
    # Pull the first recent news article from an RSS feed.
    # param rssFeed: the url to pull
    rssFeed="$1"
    date="$2"
    curl -s "$rssFeed" | grep "$date" |   tr '>' '\n' | grep /link | tail -n 1
}

function CreateCanary() {
    rm ./canary.asc
    cat > ./canary << EOM
As of $(date +%F), the AniNIX has not received any National Security Letters or FISA court orders, and we have not been subject to any gag order(s) by a FISA court, or any other similar court(s) of any government. AniNIX has never placed any backdoors in our hardware or software and has not received any requests to do so. AniNIX has never disclosed any user communications to any third party. No searches or seizures of any kind have ever been performed on AniNIX assets.

The next two updates should be on or before:
* `date -d @$(( $time + 7776000 )) +%F`
* `date -d @$(( $time + 15552000 )) +%F`

Recent news:
* $(RecentNews "$alJazeera" "$alJazeeraDate")
* $(RecentNews "$npr" "$nprdate")

To verify this message, on the terminal import our public key from $keyserver and verify the canary:
$ gpg --fetch-keys https://aninix.net/AniNIX/ShadowArch/raw/branch/main/EtcFiles/aninix.gpg
$ gpg2 --fingerprint $key
$(gpg2 --fingerprint $key)
$ gpg --verify <(curl -s $canary) 2>&1 | grep 'Good signature'
gpg: Good signature from "DarkFeather <ircs://aninix.net:6697/DarkFeather>" [ultimate]

There will most likely be other lines in the output from that last command, but as long as it says "Good signature", the verification worked correctly.
EOM
}
  
function CanarySeed() { 
    header Creating and signing a canary message
    time=`date +%s`

    # Create the canary.
    CreateCanary

    # Try signing
    gpg --default-key "$key" --personal-digest-preferences sha512 --clear-sign ./canary
    retcode=$?
    if [ $retcode -eq 0 ]; then header Success; else errorheader Fail; exit "$retcode"; fi

   # Git commit for consistent history
   if [ -n "$gitCommit" ]; then
       git add canary canary.asc
       git commit -m "Canary update for $(date +%F)"
       git push
       echo
       git log -n 1
   fi

   # Exit
   exit 0
}

function CanaryVerify() {
    # Verify a canary
    header Fingerprinting:
    ConfirmGPGKeys
    echo
    header Verification:
    if [ -f "$canary" ]; then
        canaryText="$(cat "$canary")"
    else 
        canaryText="$(curl -s "$canary")"
    fi 
    gpg --verify <(echo "$canaryText") 2>&1 | grep -v 'WARNING: not a detached signature'
    retcode=$?
    echo
    header Human-readable text:
    echo "$canaryText" | grep -B 99 'To verify this' | grep -v 'To verify this'
    exit $retcode
}

# Parse arguments
while getopts 'c:ghk:K:svV' OPTION; do
    case "$OPTION" in
        c) canary="$OPTARG" ;;
        g) gitCommit=1 ;;
        h) echo Use this script to seed or verify a warrant canary; Usage 0 ;;
        k) key="$OPTARG" ;;
        K) keyserver="$OPTARG" ;;
        s) CanarySeed ;;
        v) set -x ;;
        V) CanaryVerify ;;
        *) Usage 1 ;;
    esac
done

CanaryVerify