auth: implemented module to authenticate against our GitLab

This helps to have a convenient way to manage and test our personal
GitLab tokens. Those are used for certain API calls like creating new
repositories.

prefill the access token web view as per
https://docs.gitlab.com/ee/user/profile/personal_access_tokens.html#prefill-personal-access-token-name-and-scopes

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

4 files changed, 243 insertions, 0 deletions

diff --git a/src/lib/auth.sh b/src/lib/auth.sh
new file mode 100644
index 0000000..77d6a90
--- /dev/null
+++ b/src/lib/auth.sh
@@ -0,0 +1,72 @@
+#!/hint/bash
+#
+# This may be included with or without `set -euE`
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+[[ -z ${DEVTOOLS_INCLUDE_AUTH_SH:-} ]] || return 0
+DEVTOOLS_INCLUDE_AUTH_SH=1
+
+_DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
+
+set -e
+
+
+pkgctl_auth_usage() {
+	local -r COMMAND=${_DEVTOOLS_COMMAND:-${BASH_SOURCE[0]##*/}}
+	cat <<- _EOF_
+		Usage: ${COMMAND} [COMMAND] [OPTIONS]
+
+		Authenticate with services like GitLab.
+
+		COMMANDS
+		    login    Authenticate with the GitLab instance
+		    status   View authentication status
+
+		OPTIONS
+		    -h, --help     Show this help text
+
+		EXAMPLES
+		    $ ${COMMAND} login --gen-access-token
+		    $ ${COMMAND} status
+_EOF_
+}
+
+pkgctl_auth() {
+	if (( $# < 1 )); then
+		pkgctl_auth_usage
+		exit 0
+	fi
+
+	# option checking
+	while (( $# )); do
+		case $1 in
+			-h|--help)
+				pkgctl_auth_usage
+				exit 0
+				;;
+			login)
+				_DEVTOOLS_COMMAND+=" $1"
+				shift
+				# shellcheck source=src/lib/auth/login.sh
+				source "${_DEVTOOLS_LIBRARY_DIR}"/lib/auth/login.sh
+				pkgctl_auth_login "$@"
+				exit 0
+				;;
+			status)
+				_DEVTOOLS_COMMAND+=" $1"
+				shift
+				# shellcheck source=src/lib/auth/status.sh
+				source "${_DEVTOOLS_LIBRARY_DIR}"/lib/auth/status.sh
+				pkgctl_auth_status "$@"
+				exit 0
+				;;
+			-*)
+				die "invalid argument: %s" "$1"
+				;;
+			*)
+				die "invalid command: %s" "$1"
+				;;
+		esac
+	done
+}
diff --git a/src/lib/auth/login.sh b/src/lib/auth/login.sh
new file mode 100644
index 0000000..083e80a
--- /dev/null
+++ b/src/lib/auth/login.sh
@@ -0,0 +1,93 @@
+#!/hint/bash
+#
+# This may be included with or without `set -euE`
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+[[ -z ${DEVTOOLS_INCLUDE_AUTH_LOGIN_SH:-} ]] || return 0
+DEVTOOLS_INCLUDE_AUTH_LOGIN_SH=1
+
+_DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
+# shellcheck source=src/lib/common.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/common.sh
+# shellcheck source=src/lib/config.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/config.sh
+# shellcheck source=src/lib/api/gitlab.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/api/gitlab.sh
+
+set -e
+
+
+pkgctl_auth_login_usage() {
+	local -r COMMAND=${_DEVTOOLS_COMMAND:-${BASH_SOURCE[0]##*/}}
+	cat <<- _EOF_
+		Usage: ${COMMAND} [OPTIONS]
+
+		Interactively authenticate with the GitLab instance.
+
+		The minimum required scopes for the token are: 'api', 'write_repository'.
+
+		OPTIONS
+		    -g, --gen-access-token   Open the URL to generate a new personal access token
+		    -h, --help               Show this help text
+
+		EXAMPLES
+		    $ ${COMMAND}
+		    $ ${COMMAND} --gen-access-token
+_EOF_
+}
+
+
+pkgctl_auth_login() {
+	local token personal_access_token_url
+	local GEN_ACESS_TOKEN=0
+
+	# option checking
+	while (( $# )); do
+		case $1 in
+			-h|--help)
+				pkgctl_auth_login_usage
+				exit 0
+				;;
+			-g|--gen-access-token)
+				GEN_ACESS_TOKEN=1
+				shift
+				;;
+			*)
+				die "invalid argument: %s" "$1"
+				;;
+		esac
+	done
+
+	personal_access_token_url="https://${GITLAB_HOST}/-/profile/personal_access_tokens?name=pkgctl+token&scopes=api,write_repository"
+
+    cat <<- _EOF_
+	Logging into ${BOLD}${GITLAB_HOST}${ALL_OFF}
+
+	Tip: you can generate a Personal Access Token here ${personal_access_token_url}
+	The minimum required scopes are 'api' and 'write_repository'.
+_EOF_
+
+	if (( GEN_ACESS_TOKEN )); then
+		xdg-open "${personal_access_token_url}" 2>/dev/null
+	fi
+
+	# read token from stdin
+	read -s -r -p "${GREEN}?${ALL_OFF} ${BOLD}Paste your authentication token:${ALL_OFF} " token
+	echo
+
+	if [[ -z ${token} ]]; then
+		msg_error "  No token provided"
+		exit 1
+	fi
+
+	# check if the passed token works
+	GITLAB_TOKEN="${token}"
+	if ! result=$(gitlab_api_get_user); then
+		printf "%s\n" "$result"
+		exit 1
+	fi
+
+	msg_success "  Logged in as ${BOLD}${result}${ALL_OFF}"
+	save_devtools_config
+}
diff --git a/src/lib/auth/status.sh b/src/lib/auth/status.sh
new file mode 100644
index 0000000..6cbaab1
--- /dev/null
+++ b/src/lib/auth/status.sh
@@ -0,0 +1,69 @@
+#!/hint/bash
+#
+# This may be included with or without `set -euE`
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+[[ -z ${DEVTOOLS_INCLUDE_AUTH_STATUS_SH:-} ]] || return 0
+DEVTOOLS_INCLUDE_AUTH_STATUS_SH=1
+
+_DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
+# shellcheck source=src/lib/common.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/common.sh
+# shellcheck source=src/lib/api/gitlab.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/api/gitlab.sh
+
+set -e
+
+
+pkgctl_auth_status_usage() {
+	local -r COMMAND=${_DEVTOOLS_COMMAND:-${BASH_SOURCE[0]##*/}}
+	cat <<- _EOF_
+		Usage: ${COMMAND} [OPTIONS]
+
+		Verifies and displays information about your authentication state of
+		services like the GitLab instance and reports issues if any.
+
+		OPTIONS
+		    -t, --show-token   Display the auth token
+		    -h, --help         Show this help text
+
+		EXAMPLES
+		    $ ${COMMAND}
+		    $ ${COMMAND} --show-token
+_EOF_
+}
+
+pkgctl_auth_status() {
+	local SHOW_TOKEN=0
+	# option checking
+	while (( $# )); do
+		case $1 in
+			-h|--help)
+				pkgctl_auth_status_usage
+				exit 0
+				;;
+			-t|--show-token)
+				SHOW_TOKEN=1
+				shift
+				;;
+			*)
+				die "invalid argument: %s" "$1"
+				;;
+		esac
+	done
+
+	printf "%s\n" "${BOLD}${GITLAB_HOST}${ALL_OFF}"
+	# shellcheck disable=2119
+	if ! username=$(gitlab_api_get_user); then
+		printf "%s\n" "${username}"
+		exit 1
+	fi
+
+	msg_success "  Logged in as ${BOLD}${username}${ALL_OFF}"
+	if (( SHOW_TOKEN )); then
+		msg_success "  Token: ${GITLAB_TOKEN}"
+	else
+		msg_success "  Token: **************************"
+	fi
+}
diff --git a/src/pkgctl.in b/src/pkgctl.in
index 35305c1..e024d1f 100644
--- a/src/pkgctl.in
+++ b/src/pkgctl.in
@@ -19,6 +19,7 @@ usage() {
 		Unified command-line frontend for devtools.
 
 		COMMANDS
+		    auth    Authenticate with services like GitLab
 		    diff    Compare package files using different modes
 		    repo    Manage Git packaging repositories and their configuration
 
@@ -51,6 +52,14 @@ while (( $# )); do
 			pkgctl_repo "$@"
 			exit 0
 			;;
+		auth)
+			_DEVTOOLS_COMMAND+=" $1"
+			shift
+			# shellcheck source=src/lib/auth.sh
+			source "${_DEVTOOLS_LIBRARY_DIR}"/lib/auth.sh
+			pkgctl_auth "$@"
+			exit 0
+			;;
 		diff)
 			_DEVTOOLS_COMMAND+=" $1"
 			shift