terrible bulk emoji uploader for mattermost. needs [`jq`](https://stedolan.github.io/jq/), [`jo`](https://github.com/jpmens/jo), GNU `parallel`, and `curl`

mattermost_emoji_uploader.sh

#!/bin/bash
set -eu

MM_URL="https://mm.example.org"
API_URL="${MM_URL}/api/v3"
LOGIN_URL="${API_URL}/users/login"
USERS_ME_URL="${API_URL}/users/me"
ADD_EMOJI_URL="${API_URL}/emoji/create"

banner() {
  echo "Mattermost Bulk Emoji thing v0"
  echo "Mattermost Instance: $MM_URL"
  echo
}

USERNAME=""
PASSWORD=""
get_username_and_password() {
  read -p "Username: " USERNAME
  read -sp "Password: " PASSWORD
  echo
}

TOKEN=""
get_token() {
  TOKEN="$(curl -sSi "${LOGIN_URL}" \
            -d "$(jo login_id="${USERNAME}" password="${PASSWORD}")" \
            | grep -E "^Token: " \
            | sed -e 's/Token: //;s/[^a-z0-9]//g')"
  if [ "${TOKEN}" = "" ]; then
    echo "Error logging in"
    exit 1
  fi
}

USER_ID=""
get_user_id() {
  local user_data="$(curl -sS \
    -H "Authorization: Bearer ${TOKEN}" \
    "${USERS_ME_URL}")"
  USER_ID="$(echo "${user_data}" | jq -r '.id')"
}

emoji_name_and_path() {
  for f in "${EMOJI_PATHS[@]}"; do
    echo "$(basename $f | sed -e 's/\..*$//')"
    echo $f
  done
}

upload_emoji() {
  export -f upload_one_emoji
  export TOKEN USER_ID ADD_EMOJI_URL
  emoji_name_and_path \
  | parallel -j20 -n2 "upload_one_emoji {1} {2}"
}

upload_one_emoji() {
  local name="$1"
  local path="$2"
  upload_response="$(curl -sS \
    --header "Authorization: Bearer ${TOKEN}" \
    --form "image=@${path}" \
    --form "emoji=$(jo creator_id="${USER_ID}" name=\"${name}\")" \
    "${ADD_EMOJI_URL}")"
  status_code="$(echo "${upload_response}" | jq -r '.status_code')"
  if [ "$status_code" != "null" ]; then
    error_id="$(echo "${upload_response}" | jq -r '.id')"
    case "$error_id" in
      api.emoji.create.duplicate.app_error)
        echo "Emoji :$name: exists, not added"
        return 1
      ;;
      null)
      ;;
      *)
        echo "Error $error_id: $(echo "${upload_response}" | jq -r '.message')"
        echo "${upload_response}"
        return 1
      ;;
    esac
  fi
  echo "uploaded $path as :$name:"
  return 0
}

EMOJI_PATHS=("$@")
if [ "${#EMOJI_PATHS[@]}" -eq 0 ]; then
  echo "Must pass one or more files."
  echo "Usage: $0 <file> [file ...]"
  exit 1
fi
banner
get_username_and_password
get_token
get_user_id
upload_emoji