github_fetchfile_small

#!/usr/bin/env bash
###############################################################################
## File: github_fetchfile_small
## Purpose: Shell Script to curl-download small files from github
## Notes:
## - Will use your Github CLI Token from the macOS Keychain
## - Will fail if the file is larger than 1MB as it uses the /contents/ API
## - See also: github_fetchfile
###############################################################################

set -e

while getopts ":t:o:r:b:p:O:s:" opt; do
	case $opt in
		t) TOKEN="$OPTARG"
		;;
		s) SCRIPT_NAME="$OPTARG"
		;;
		o) REPO_OWNER="$OPTARG"
		;;
		r) REPO="$OPTARG"
		;;
		b) BRANCH="$OPTARG"
		;;
		p) ASSET_PATH="$OPTARG"
		;;
		O) OUTPUT_PATH="$OPTARG"
		;;
		\?) INVALID=1; echo "Invalid Option: -$OPTARG" >&2
		;;
	esac
done

INVALID=${INVALID:-0}

# Set Defaults
REPO_OWNER=${REPO_OWNER:-"$GITHUB_USER"}
BRANCH=${BRANCH:-"main"}
# Used to get a unique access code for this script
SCRIPT_NAME=${SCRIPT_NAME:-"$(basename "$0")"}

# Test required params
if [[ INVALID -eq 0 ]] && [[ "$REPO_OWNER" == "" ]]; then
	echo "Repository owner must be passed in, or ENV[\$GITHUB_USER] must be set!" >&2
	INVALID=1
fi

TOKEN=$("$(dirname "${BASH_SOURCE[0]}" )/github_token" -r -s "$SCRIPT_NAME")
if [[ INVALID -eq 0 ]] && [[ "$TOKEN" == "" ]]; then
	echo "Couldn't load Github Personal Access Token, aborting… " >&2
	exit 1
fi

if [[ INVALID -eq 0 ]] && [[ "$ASSET_PATH" == "" ]]; then
	echo "-p ASSET_PATH missing." >&2
	INVALID=1
fi
if [[ INVALID -eq 0 ]] && [[ "$OUTPUT_PATH" == "" ]]; then
	echo "-O OUTPUT_PATH missing." >&2
	INVALID=1
fi

if [ $INVALID -eq 1 ]; then
	echo "Usage: $0 [-t TOKEN] [-s SCRIPT_NAME] [-o REPO_OWNER] -r REPO [-b BRANCH] -p ASSET_PATH -O OUTPUT_PATH" >&2
	echo " -t Github Personal Access Token with sufficient permissions. Will look at keychain if omitted." >&2
	echo " -s Identifier for the Keychain item used to lookup a token for this script." >&2
	echo " -b Choose what branch to fetch from. If omitted, the default branch name is 'main'." >&2
	exit 1
fi

# echo "$TOKEN $REPO_OWNER $REPO $BRANCH $ASSET_PATH $OUTPUT_PATH" >&1

curl -L \
     --header "Authorization: token $TOKEN" \
     --header "Accept: application/vnd.github.v3.raw" \
     -o "$OUTPUT_PATH" \
     "https://api.github.com/repos/$REPO_OWNER/$REPO/contents/$ASSET_PATH?ref=$BRANCH"