BashCI - A simple CI written in bash for Gitlab (can be easily adapted to any other CI)

bashci.sh

#!/bin/bash

JOBS_FOLDER="$(dirname $0)/jobs"
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function response_headers() {
	local CODE=$1
	local REASON=$2
	local CONTENT_TYPE=$3

	if [ -z "$CONTENT_TYPE" ];
	then
		CONTENT_TYPE=text/html
	fi

	echo -en "HTTP/1.1 $CODE $REASON\r\n";
	echo -en "Content-Type: $CONTENT_TYPE\r\n";
	echo -en "Transfer-Encoding: Identity\r\n";
	echo -en "Connection: Close\r\n";
	echo -en "\r\n";
}

function response_200() {
	response_headers "200" "OK" "$1"
}

function response_403() {
	response_headers "403" "Forbidden" "$1"
}

function response_404() {
	response_headers "404" "Not Found" "$1"
}

function response_500() {
	response_headers "500" "Internal Error" "$1"
}

function check_gitlab_token() {
	local EXPECTED_TOKEN=$1
	if [ "$HTTP_HEADER_XGITLABTOKEN" != "$EXPECTED_TOKEN" ];
	then
		response_403
		echo '<h1>Token mismatch</h1>'
		exit 0
	fi
}

function send_email() {
	local SUBJECT=$1
	local MESSAGE=$2
	local ATTACHMENT=$3
}

# read the request
read HTTP_REQUEST

HTTP_REQUEST_URL="${HTTP_REQUEST#GET }"
HTTP_REQUEST_URL="${HTTP_REQUEST_URL% HTTP/*}"
HTTP_REQUEST_PATH="${HTTP_REQUEST_URL%%\?*}"
HTTP_REQUEST_QUERY="${HTTP_REQUEST_URL#*\?}"

unset HTTP_REQUEST

# read and parse the headers
while true; do
        read HTTP_HEADER
        [ -z "$HTTP_HEADER" ] && break
        HTTP_HEADER_KEY=${HTTP_HEADER%%:*}
        HTTP_HEADER_VALUE=${HTTP_HEADER#*:}
        HTTP_HEADER_KEY=$(echo $HTTP_HEADER_KEY | tr [:lower:] [:upper:] | sed 's/[^A-Z]//g')
        HTTP_HEADER_VALUE=$(echo $HTTP_HEADER_VALUE | sed -e 's/^[[:space:]]*//')
        eval "HTTP_HEADER_$HTTP_HEADER_KEY='$HTTP_HEADER_VALUE'"

        unset HTTP_HEADER
        unset HTTP_HEADER_KEY
        unset HTTP_HEADER_VALUE
done

# read and parse the query string
for HTTP_QUERY in $(echo $HTTP_REQUEST_QUERY | sed -e 's/\&/ /g') ; do
        HTTP_QUERY_KEY=${HTTP_QUERY%%=*}
        HTTP_QUERY_VALUE=${HTTP_QUERY#*=}
        HTTP_QUERY_KEY=$(echo $HTTP_QUERY_KEY | tr [:lower:] [:upper:] | sed 's/[^A-Z]//g')
        HTTP_QUERY_VALUE=$(echo $HTTP_QUERY_VALUE | tr -d ';''\001'-'\011''\013''\014''\016'-'\037''\200'-'\377')
        eval "HTTP_QUERY_$HTTP_QUERY_KEY='$HTTP_QUERY_VALUE'"

        unset HTTP_QUERY
        unset HTTP_QUERY_KEY
        unset HTTP_QUERY_VALUE
done

HTTP_QUERY_JOB=$(echo "$HTTP_QUERY_JOB" | sed 's/[^0*9A-Za-z_\-]//g')

if [ -z "$HTTP_QUERY_JOB" ];
then
	response_404
	echo '<h1>Job not specified</h1>'
	exit 0
fi

JOB_PATH="$JOBS_FOLDER/$HTTP_QUERY_JOB.sh"

if [ "$(dirname $(realpath $JOB_PATH 2>/dev/null))" != "$(realpath $JOBS_FOLDER)" ];
then
	response_404
	echo '<h1>Invalid job name</h1>'
	exit 0
fi

if [ ! -f "$JOB_PATH" ];
then
	response_404
	echo '<h1>Not-existant job</h1>'
	exit 0
fi

if [ ! -x "$JOB_PATH" ];
then
	response_404
	echo '<h1>Job not executable</h1>'
	exit 0
fi

JOB_OUTPUT=$($JOB_PATH 2>&1)
JOB_EXIT_CODE=$?

if [ $JOB_EXIT_CODE -eq 0 ];
then
	response_200
	echo "<h1>DONE</h1>"
else
	response_500
	echo "<h1>Execution Failed!</h1>"
	echo "<hr>"
	echo "<pre>"
	echo $JOB_OUTPUT
	echo "</pre>"

	JOB_OUTPUT_PATH=$(mktemp)
	echo "$JOB_OUTPUT" > $JOB_OUTPUT_PATH
	send_email "[BashCI] Job $HTTP_QUERY_JOB Failed" "The job $HTTP_QUERY_JOB failed the execution with exit code $JOB_EXIT_CODE" "$JOB_OUTPUT_PATH"
	rm $JOB_OUTPUT_PATH
fi