#!/bin/bash
# Interact with the GOGS API
# Copyright (c) 2017 Matthew Downey (mattddowney@gmail_NOSPAM_.com)
# Relased under the MIT License
# See https://raw.githubusercontent.com/mattddowney/gogs-bash/master/LICENSE for the complete license text

action=${1:-"help"}

# preseed for checks
response_code=0

# ensure GOGS_ROOT_URL is set
if [ -z $GOGS_ROOT_URL ]
then
	printf "Need to set GOGS_ROOT_URL environment variable\n" >&2
	printf "\tIE: https://try.gogs.io\n" >&2

	response_code=1
fi

# ensure GOGS_TOKEN is set
if [ -z $GOGS_TOKEN ]
then
	printf "Need to set GOGS_TOKEN environment variable\n" >&2
	printf "\tThis can be obtained at $GOGS_ROOT_URL/user/settings/applications\n" >&2

	response_code=1
fi

# exit if either of the environment variables above are not set
if [ $response_code -ne 0 ]
then
	exit $response_code
fi

# create a GOGS repository
# https://github.com/gogits/go-gogs-client/wiki/Administration-Repositories#create-a-new-repository
create-repo() {
	local user_name=$1  # name of the user / organization where the repo will be created
	local repo_name=$2  # name of the repo to be created
    local repo_desc=$3

	# ensure user_name is passed in
	if [ -z $user_name ]
	then
		response_code=1
	fi

	# ensure repo_name is passed in
	if [ -z $repo_name ]
	then
		response_code=1
	fi

	# print help and exit either of the variables above are not passed in
	if [ $response_code -ne 0 ]
	then
		help "create-repo"

		exit $response_code
	fi

	printf "--" "---> Creating GOGS repository\n"
	printf "--" "---> User/Org Name: $user_name\n"
	printf "--" "---> Repo Name: $repo_name\n"

	local body=$(cat <<-END
		{
			"name": "$repo_name",
			"private": true,
            "description": "$repo_desc"
		}
	END
    )

	curl -H "Content-Type: application/json" \
		 -H "Authorization: token $GOGS_TOKEN" \
		 -d "$body" \
		 $GOGS_ROOT_URL/api/v1/admin/users/$user_name/repos |jq

}

# create a GOGS webhook
# https://github.com/gogits/go-gogs-client/wiki/Repositories-Webhooks#create-a-hook
create-webhook() {
	local user_name=$1    # name of the user / organization that owns the repo where the webhook will be created
	local repo_name=$2    # name of the repo where the webhook will be created
	local webhook_url=$3  # the url for the webhook that will be created
	local secret=$4       # optional secret that will be passed in the X-Gogs-Signature header

	# ensure user_name is passed in
	if [ -z $user_name ]
	then
		response_code=1
	fi

	# ensure repo_name is passed in
	if [ -z $repo_name ]
	then
		response_code=1
	fi

	# ensure that webhook_url is passed in
	if [ -z $webhook_url ]
	then
		response_code=1
	fi

	# print help and exit either of the variables above are not passed in
	if [ $response_code -ne 0 ]
	then
		help "create-webhook"

		exit $response_code
	fi

	printf "--" "---> Creating GOGS webhook\n"
	printf "--" "---> Repo Name: $repo_name\n"
	printf "--" "---> Webhook URL: $webhook_url\n"
	
	local body=$(cat <<-END
		{
			"type": "gogs",
			"config": {
				"content_type": "json",
				"url": "$webhook_url"
			},
			"events": [ "create", "push" ],
			"active": true
		}
	END
	)

	# add secret to body if one is passed in
	if [ -n $secret ]
	then
		body=$(echo "$body" | jq ".config.secret=\"$secret\"")
	fi

	curl -H "Content-Type: application/json" \
		 -H "Authorization: token $GOGS_TOKEN" \
		 -d "$body" \
		 $GOGS_ROOT_URL/api/v1/repos/$user_name/$repo_name/hooks
}

# delete a GOGS webhook for a repo
# https://github.com/gogits/go-gogs-client/wiki/Repositories-Webhooks#delete-a-hook
delete-webhook() {
	local user_name=$1
	local repo_name=$2
	local webhook_id=$3

	# ensuer user_name is passed in
	if [ -z $user_name ]
	then
		response_code=1
	fi

	# ensure repo_name is passed in
	if [ -z $repo_name ]
	then
		response_code=1
	fi

	# ensure webhook_id is passed in
	if [ -z $webhook_id ]
	then
		response_code=1
	fi

	# print help and exit any of the variables above are not passed in
	if [ $reponse_code -ne 0 ]
	then
		help "delete-webhook"

		exit $response_code
	fi

	printf "--" "---> Deleting GOGS webhook\n"
	printf "--" "---> User Name: $user_name\n"
	printf "--" "---> Repo Name: $repo_name\n"
	printf "--" "---> Webhook Id: $webhook_id\n"

	curl -H "Authorization: token $GOGS_TOKEN" \
		 -X DELETE \
		 -v $GOGS_ROOT_URL/api/v1/repos/$user_name/$repo_name/hooks/$webhook_id
}

# print environment information
env() {
	printf "GOGS_ROOT_URL=$GOGS_ROOT_URL\n"
	printf "GOGS_TOKEN=$GOGS_TOKEN\n"
}

# get a list of GOGS repos for a user
# https://github.com/gogits/go-gogs-client/wiki/Repositories#list-user-repositories
get-user-repos() {
	local user_name=$1 # name of the user who's repos to list

	# ensure user_name is passed in
	if [ -z $user_name ]
	then
		help "get-user-repos"

		exit 1
	fi

	printf "--" "---> Getting list of GOGS repos\n"
	printf "--" "---> User Name: $user_name\n"

	curl -H "Content-Type: application/json" \
	     -H "Authorization: token $GOGS_TOKEN" \
		 -v $GOGS_ROOT_URL/api/v1/users/$user_name/repos
}

# get a list of GOGS webhooks for a repo
# https://github.com/gogits/go-gogs-client/wiki/Repositories-Webhooks#list-hooks
get-webhooks() {
	local user_name=$1 # name of the user / organization that owns the repo
	local repo_name=$2 # name of the repo to list webhooks for

	# ensure user_name is passed in
	if [ -z $user_name ]
	then
		response_code=1
	fi

	# ensure repo_name is passed in
	if [ -z $repo_name ]
	then
		response_code=1
	fi

	# print help and exit either of the variables above are not passed in
	if [ $response_code -ne 0 ]
	then
		help "get-webhooks"

		exit $response_code
	fi

	printf "--" "---> Getting list of GOGS webhooks\n"
	printf "--" "---> User Name: $user_name\n"
	printf "--" "---> Repo Name: $repo_name\n"

	curl -H "Authorization: token $GOGS_TOKEN" \
		 -v $GOGS_ROOT_URL/api/v1/repos/$user_name/$repo_name/hooks
}

# print help
help() {
	local prog_name=$(echo "$0" | rev | cut -d'/' -f1 | rev)
	local topic=$1

	case "$topic" in
		create-repo)
			cat <<-END
			Create a GOGS repository.
			
			Usage:
			
			    $prog_name $1 <user_name> <repo_name> <repo_desc>
			
			Arguments:
			
			    user_name   name of the user or organization where the repo will be created
			    repo_name   name of the repository to be created
                repo_desc   repository description
			END
			;;

		create-webhook)
			cat <<-END
			Create a GOGS webhook.
			
			Usage:
			
			    $prog_name $1 <user_name> <repo_name> <webhook_url> [secret]
			
			Arguments:
			
			    user_name       name of the user / organizationo that owns the repo where the webhook will be created
			    repo_name       name of the repo where the webhook will be created
			    webhook_url     the url for the webhook that will be created
				secret          optional secret that will be passed in the X-Gogs-Signature header
			END
			;;

		delete-webhook)
			cat <<-END
			Delete a GOGS webhook.

			Usage:

			    $prog_name $1 <user_name> <repo_name> <webhook_id>

			Arguments:

			    user_name   name of the user / organizationo that owns the repo containing the webhook
				repo_name	name of the repo that contains the webhook
				webhook_id  id of the webhook that will be deleted
			END
			;;

		env)
			cat <<-END
			Prints environment variables needed by this script.

			Variables:
				
			    GOGS_ROOT_URL   The url of the GOGS server
				                    (IE: https://try.gogs.io)

			    GOGS_TOKEN      Application token configured in GOGS
				                    (Obtained from $GOGS_ROOT_URL/user/settings/applications)
			END
			;;

		get-user-repos)
			cat <<-END
			Get a list of GOGS repos for a user.

			Usage:

			    $prog_name $1 <user_name>

			Arguments:

			    user_name   name of the user who's repos to list
			END
			;;

		get-webhooks)
			cat <<-END
			Get a list of GOGS webhooks for a repo.

			Usage:

			    $prog_name $1 <user_name> <repo_name>

			Arguments:

			    user_name	name of the user / organization that owns the repo
			    repo_name   name of the repo to list webhooks for
			END
			;;

		*)
			cat <<-END
			$prog_name is a tool for interacting with the GOGS API.
			
			Usage:
			    $prog_name command [arguments]
			
			The commands are:
			
			    create-repo     create a repository
			    create-webhook  create a webhook
			    delete-webhook  delete a webhook
			    env             print environment information
			    get-user-repos  get a list of repos for a user
			    get-webhooks    get a list of webhooks for a repo
			
			Use "$prog_name help [command]" for more information about a command.
			END
			;;
	esac
}

"$action" "${@:2}"