Validate URL redirections using cURL

validate-urls.sh

#!/bin/bash

(

    # The redirects: test URL and expected URL, separated by a
    # pipe character
    REDIRECTS=(
        "http://www.google.com|http://www.google.co.in"
    )

    # Make string comparisons case insensitive, because Apache
    # can cast redirected URLs to lowercase
    shopt -s nocasematch

    # Test each, errrr, test
    for REDIRECT in ${REDIRECTS[@]}; do
        # Split the test on the pipe, and get the first portion
        # as the test URL
        TEST_URL=`echo $REDIRECT |cut -d '|' -f1 `
        # Split the test on the pipe, and get the second portion
        # as the expected URL resulting from the redirects
        EXPECTED_URL=`echo $REDIRECT |cut -d '|' -f2 `
        # Check the URL using Curl, returning just the HTTP
        # status code and the URL at the end of the redirections,
        # separated by a space
        RESULT=$(curl -I -s -w "%{http_code} %{redirect_url}\\n" "$TEST_URL" -o /dev/null)
        # Split the Curl result by a space, and get the first
        # portion as the HTTP Status code
        HTTP_CODE=`echo $RESULT |cut -d ' ' -f1 `
        # Split the Curl result by a space, and get the second
        # portion as the URL at the end of the redirections
        URL_EFFECTIVE=`echo $RESULT |cut -d ' ' -f2 `
        # Compare the end URL with the expected URL, output
        # the result as status code, if
        # there's an error, an explanation
        if [[ "$URL_EFFECTIVE" == "$EXPECTED_URL" ]]; then
            echo "$HTTP_CODE : \"$TEST_URL\" reditected to \"$EXPECTED_URL\" as expected."
        else
            echo "$HTTP_CODE : \"$TEST_URL\" exptected to reach \"$EXPECTED_URL\", reached to \"$URL_EFFECTIVE\""
        fi
    done
)