gistfile1.txt

#!/bin/bash

CLIENT_ID="e442433569512b1"
CLIENT_SECRET="b088d1efe225fb9cfa8bad79290a77209c13de5e"
EXPIRE_TIME="3500"

CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/imgur"
mkdir -p "$CACHE_DIR"
ACCESS_TOKEN_FILE="$CACHE_DIR/token-access"
REFRESH_TOKEN_FILE="$CACHE_DIR/token-refresh"

function json {
	echo "$1" | grep -Po "\"$2\":\".*?\"[,}]" | sed "s/^\"$2\":\"//;s/\"[,}]$//;s:\\\\/:/:g"
}

function show_error {
	notify-send "imgur uploader" "$1"
}

function check_for_error {
	if [ "$(echo "$1" | grep error)" ]; then
		error=$(json "$1" "error")
		return 0
	fi
	return 1
}

# check arguments
if [ $# -lt 2 ]; then
	echo "usage: imgur [ALBUM ID] [FILES...]"
	exit 1
fi

# get album
album="$1"
shift

# authenticate
if [[ -f "$REFRESH_TOKEN_FILE" && -f "$ACCESS_TOKEN_FILE" ]]; then
	# see if the token's expired
	if [ "$(expr $(date +%s) - $(date +%s -r "$ACCESS_TOKEN_FILE"))" -gt "$EXPIRE_TIME" ]; then
		echo "expired"
		# Get new access token
		refresh_token=$(cat "$REFRESH_TOKEN_FILE")
		response=$(curl -d "refresh_token=$refresh_token" -d "client_id=$CLIENT_ID" -d "client_secret=$CLIENT_SECRET" -d "grant_type=refresh_token" https://api.imgur.com/oauth2/token 2>/dev/null)
		if check_for_error "$response"; then
			show_error "$error"
			exit 1
		fi

		# Record token
		access_token=$(json "$response" "access_token")
		echo "$access_token" > "$ACCESS_TOKEN_FILE"
	else
		# Read the existing token from the disk
		access_token=$(cat "$ACCESS_TOKEN_FILE")
	fi
else
	# Get the PIN from the user
	xdg-open "https://api.imgur.com/oauth2/authorize?client_id=$CLIENT_ID&response_type=pin" >/dev/null 2>&1 &
	pin=$(zenity --entry --title="imgur uploader" --text="Enter the PIN" 2>/dev/null)
	if [ ! "$pin" ]; then
		show_error "no pin selected"
		exit 1
	fi

	# Get tokens
	response=$(curl -d "client_id=$CLIENT_ID" -d "client_secret=$CLIENT_SECRET" -d "grant_type=pin" -d "pin=$pin" https://api.imgur.com/oauth2/token/ 2>/dev/null)
	if check_for_error "$response"; then
		show_error "$error"
		exit 1
	fi

	# Save values
	access_token=$(json "$response" "access_token")
	refresh_token=$(json "$response" "refresh_token")
	echo "$access_token" > "$ACCESS_TOKEN_FILE"
	echo "$refresh_token" > "$REFRESH_TOKEN_FILE"
fi

error=
clip=

# loop through arguments
for file; do
	# check file exists
	if [ ! -f "$file" ]; then
		error="$file doesn't exist"
		break
	fi

	# upload the image
	response=$(curl -H "Authorization: Bearer $access_token" -F "image=@$file" -F "album=$album" -F "title=$(basename "$file")" https://api.imgur.com/3/image 2>/dev/null)

	# check for error
	if check_for_error "$response"; then
		error="$(json "$response" "error")"
		break
	fi

	# parse the response and output our stuff
	url=$(json "$response" "link")
	echo "$url"
	if [ "$clip" ]; then
		clip="$clip
$url"
	else
		clip="$url"
	fi
done

if [ "$clip" ]; then
	echo -n "$clip" | xclip -selection c
	notify-send "imgur uploader" "$clip"
fi

if [ "$error" ]; then
	show_error "$error"
	exit 1
fi