insta

#!/usr/bin/env bash
#########################################################################
# Made by    : Ewoud Dronkert
# Licence    : GNU GPL v3
# Platform   : macOS
# Requires   : bash, GNU grep, curl, file, open
# Location   : ~/bin, /usr/local/bin
# Name       : insta
# Version    : 1.0.0
# Date       : 2019-03-21
# Purpose    : Download large version(s) of Instagram photos
# Parameters : <Instagram page URL>
# Exit     0 : No script errors
#          1 : Missing parameter
#          2 : Invalid parameter
#          3 : Unable to fetch Instagram image URL(s)
#########################################################################

[ -z "$1" ] && { echo 'Usage: insta <Instagram page URL>' 2>&1; exit 1; }
PAGE=$(echo "$1" | grep -oE 'https://www\.instagram\.com/p/[^/]+/')
[ -z "$PAGE" ] && { echo 'Argument is not an Instagram page URL.' 2>&1; exit 2; }

SAVE=$(echo "$PAGE" | cut -d/ -f5)
URLS=$(curl -A 'Just another browser' -s "$PAGE?__a=1" | grep -oE '[^{]*1080[^}]*' | grep -oE 'https[^"]*' | grep -Fv 's150x150' | uniq)
N=$(echo "$URLS" | wc -l | xargs)
if (( N == 1 )); then
    ARG="-o $SAVE.jpg"
elif (( N > 1 )); then
    URLS=$(echo "$URLS" | xargs)
    ARG=
    for (( i = 1; i <= N; i++ )); do
        ARG="$ARG -o ${SAVE}_$i.jpg"
    done
else
    echo "Couldn't fetch Instagram image URLs." 1>&2
    exit 3
fi

curl -A 'Just another browser' -s $ARG $URLS

if (( N == 1 )); then
    if [ -f "$SAVE.jpg" -a -r "$SAVE.jpg" ]; then
        echo "Instagram image saved as: $SAVE.jpg"
        FTYPE=$(file -b "$SAVE.jpg" | awk '{print $1}')
        [ "$FTYPE" = "JPEG" ] && open "$SAVE.jpg"
    fi
else
    echo "Instagram images saved as:"
    for (( i = 1; i <= N; i++ )); do
        echo -e "\t${SAVE}_$i.jpg"
    done
fi
exit 0