post.sh

#!/usr/bin/env bash

set -x

# URL of your Mastodon server, without a trailing slash
MASTODON_SERVER="https://mastodon.social"

# Your Mastodon account's access token
MASTODON_TOKEN="TOKEN_HERE"

# URL of your Bluesky server, without a trailing slash
BLUESKY_SERVER="https://bsky.social"

# Your Bluesky account's username
BLUESKY_USERNAME="USERNAME_HERE"

# Your Bluesky account's password
BLUESKY_PASSWORD="PASSWORD_HERE"

# Define a failure function
function exit_error {
    printf '%s\n' "$1" >&2
    exit "${2-1}"
}

# Select an entry from the list
function select_entry {
    # Select a random entry from the list
    local entry=$(sort -R finds_you.txt | head -1)
    # Remove any trailing carriage return from the entry
    echo "$entry" | tr -d '\r'
}

# See if an entry has been used in the past 500 posts
function is_recent {
    local entry_hash=$(echo -n "$1" | md5sum | cut -d ' ' -f 1)
    if tail -n 500 post_history.txt | grep -q "$entry_hash"; then
        return 0  # 0 = true, recent
    else
        return 1  # 1 = false, not recent
    fi
}

# Move into the directory where this script is found
cd "$(dirname "$0")" || exit

# Loop until a non-recent entry is found
while true; do
    ENTRY=$(select_entry)
    if is_recent "$ENTRY"; then
        echo "Entry is recent, selecting another..."
        continue
    else
        break
    fi
done

POST="I hope this email ${ENTRY}"

# Send the message to Mastodon
curl "$MASTODON_SERVER"/api/v1/statuses -H "Authorization: Bearer ${MASTODON_TOKEN}" -F "status=${POST}"
RESULT=$?
if [ "$RESULT" -ne 0 ]; then
    exit_error "Posting message to Mastodon failed"
fi

# Log this to the post history
echo -n "$ENTRY" | md5sum | cut -d ' ' -f 1 >> post_history.txt

# Create an authentication session on Bluesky
ACCESS_JWT=$(curl -X POST $BLUESKY_SERVER/xrpc/com.atproto.server.createSession \
    -H "Content-Type: application/json" \
    -d '{"identifier": "'"$BLUESKY_USERNAME"'", "password": "'"$BLUESKY_PASSWORD"'"}' \
    | jq -r '.accessJwt')
RESULT=$?
if [ "$RESULT" -ne 0 ]; then
    exit_error "Could not authenticate to Bluesky"
fi

# Post the message to Bluesky
curl -X POST $BLUESKY_SERVER/xrpc/com.atproto.repo.createRecord \
    -H "Authorization: Bearer $ACCESS_JWT" \
    -H "Content-Type: application/json" \
    -d "{\"repo\": \"$BLUESKY_USERNAME\", \"collection\": \"app.bsky.feed.post\", \"record\": {\"text\": \"$POST\", \"createdAt\": \"$(date -u +%Y-%m-%dT%H:%M:%SZ)\"}}"

RESULT=$?
if [ "$RESULT" -ne 0 ]; then
    exit_error "Posting message to Bluesky failed"
fi