pbr

#!/bin/sh
# [CMD] | pbr [FILE..] - send data to various paste services
#
# SPDX-License-Identifier: 0BSD

set -eu

: "${PBR_INDEX_FILE="${XDG_CACHE_HOME:-"$HOME/.cache"}/pbr/last_service_index"}"
: "${PBR_MODE:="round-robin"}"

error() {
	printf 'ERROR: %s\n' "$@"
	exit 1
}

store_index() {
	index="$1"
	mkdir -p "$(dirname "$PBR_INDEX_FILE")"
	printf '%s' "$index" >"$PBR_INDEX_FILE"
}

# services
#
# all service wrapper functions expect exactly one argument, which needs to be
# a path.  convention is to redirect stdin from file ( < ) to ensure reading
# from /dev/stdin works correctly

_curl() {
	curl -s "$@"
}

dpaste_com() {
	_curl -F "content=<-" https://dpaste.com/api/v2/ <"$1"
}

ix_io() {
	_curl -F 'f:1=@-' ix.io <"$1"
}

paste_rs() {
	_curl --data-binary '@-' https://paste.rs <"$1"
}

termbin_com() {
	nc termbin.com 9999 <"$1"
}

ttm_sh() {
	_curl -F "file=@-" https://ttm.sh <"$1"
}

OxO_st() {
	_curl -F'file=@-' https://0x0.st <"$1"
}

available_services="dpaste_com ix_io paste_rs termbin_com ttm_sh OxO_st"

service_index_current=0
service_index_max="$(printf '%s' "$available_services" | wc -w)"
# determine the next service's index
get_current_service_index() {
	case "$PBR_MODE" in
		round-robin)
			service_index_current="$(cat "$PBR_INDEX_FILE" 2>/dev/null || echo 0)"
			service_index_current="$((service_index_current + 1))"
			[ "$service_index_current" -le "$service_index_max" ] || service_index_current=1

			store_index "$service_index_current"
			;;
		random)
			service_index_current="$(shuf -i 1-"$service_index_max" -n1)"
			;;
	esac
	printf '%s' "$service_index_current"
}

# return service wrapper function name from the list of available services
get_service_handler() {
	echo "$available_services" | cut -d' ' -f"$(get_current_service_index)"
}

# pipe mode
if [ -p /dev/stdin ]; then
	# technically, it's not wrong to read from stdin and from arguments at the same
	# time, but this is smell we better warn about
	[ "$#" -eq 0 ] || error "Do not mix pipes with args"

	set -- /dev/stdin "$@"
fi

for f; do
	[ -p "$f" ] && continue
	[ -f "$f" ] || error "File not found: $f"
	[ -s "$f" ] || error "File empty: $f"
done

for f; do
	srv="$(get_service_handler)"
	"$srv" "$f"
done