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Rework read/save config to not save default values

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Add and use _readaccountconf_mutable_default and
_saveaccountconf_mutable_default helpers to capture
common default value handling.

New approach also eliminates need for separate
underscore-prefixed version of each conf var.
This commit is contained in:
medmunds 2021-02-16 12:49:27 -08:00
parent 585c0c3818
commit 6e77756d6a
1 changed files with 148 additions and 105 deletions
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253
notify/smtp.sh
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@ -17,155 +17,150 @@
# SMTP_TIMEOUT="30" # seconds for SMTP operations to timeout # SMTP_TIMEOUT="30" # seconds for SMTP operations to timeout
# SMTP_BIN="/path/to/curl_or_python" # default finds first of curl, python3, or python on PATH # SMTP_BIN="/path/to/curl_or_python" # default finds first of curl, python3, or python on PATH
SMTP_SECURE_DEFAULT="none"
SMTP_TIMEOUT_DEFAULT="30"
# subject content statuscode # subject content statuscode
smtp_send() { smtp_send() {
_SMTP_SUBJECT="$1" SMTP_SUBJECT="$1"
_SMTP_CONTENT="$2" SMTP_CONTENT="$2"
# UNUSED: _statusCode="$3" # 0: success, 1: error 2($RENEW_SKIP): skipped # UNUSED: _statusCode="$3" # 0: success, 1: error 2($RENEW_SKIP): skipped
# Load config: # Load and validate config:
SMTP_FROM="${SMTP_FROM:-$(_readaccountconf_mutable SMTP_FROM)}" SMTP_BIN="$(_readaccountconf_mutable_default SMTP_BIN)"
SMTP_TO="${SMTP_TO:-$(_readaccountconf_mutable SMTP_TO)}"
SMTP_HOST="${SMTP_HOST:-$(_readaccountconf_mutable SMTP_HOST)}"
SMTP_PORT="${SMTP_PORT:-$(_readaccountconf_mutable SMTP_PORT)}"
SMTP_SECURE="${SMTP_SECURE:-$(_readaccountconf_mutable SMTP_SECURE)}"
SMTP_USERNAME="${SMTP_USERNAME:-$(_readaccountconf_mutable SMTP_USERNAME)}"
SMTP_PASSWORD="${SMTP_PASSWORD:-$(_readaccountconf_mutable SMTP_PASSWORD)}"
SMTP_TIMEOUT="${SMTP_TIMEOUT:-$(_readaccountconf_mutable SMTP_TIMEOUT)}"
SMTP_BIN="${SMTP_BIN:-$(_readaccountconf_mutable SMTP_BIN)}"
_debug "SMTP_FROM" "$SMTP_FROM"
_debug "SMTP_TO" "$SMTP_TO"
_debug "SMTP_HOST" "$SMTP_HOST"
_debug "SMTP_PORT" "$SMTP_PORT"
_debug "SMTP_SECURE" "$SMTP_SECURE"
_debug "SMTP_USERNAME" "$SMTP_USERNAME"
_secure_debug "SMTP_PASSWORD" "$SMTP_PASSWORD"
_debug "SMTP_TIMEOUT" "$SMTP_TIMEOUT"
_debug "SMTP_BIN" "$SMTP_BIN"
_debug "_SMTP_SUBJECT" "$_SMTP_SUBJECT"
_debug "_SMTP_CONTENT" "$_SMTP_CONTENT"
# Validate config and apply defaults:
# _SMTP_* variables are the resolved (with defaults) versions of SMTP_*.
# (The _SMTP_* versions will not be stored in account conf.)
if [ -n "$SMTP_BIN" ] && ! _exists "$SMTP_BIN"; then if [ -n "$SMTP_BIN" ] && ! _exists "$SMTP_BIN"; then
_err "SMTP_BIN '$SMTP_BIN' does not exist." _err "SMTP_BIN '$SMTP_BIN' does not exist."
return 1 return 1
fi fi
_SMTP_BIN="$SMTP_BIN" if [ -z "$SMTP_BIN" ]; then
if [ -z "$_SMTP_BIN" ]; then
# Look for a command that can communicate with an SMTP server. # Look for a command that can communicate with an SMTP server.
# (Please don't add sendmail, ssmtp, mutt, mail, or msmtp here. # (Please don't add sendmail, ssmtp, mutt, mail, or msmtp here.
# Those are already handled by the "mail" notify hook.) # Those are already handled by the "mail" notify hook.)
for cmd in curl python3 python2.7 python pypy3 pypy; do for cmd in curl python3 python2.7 python pypy3 pypy; do
if _exists "$cmd"; then if _exists "$cmd"; then
_SMTP_BIN="$cmd" SMTP_BIN="$cmd"
break break
fi fi
done done
if [ -z "$_SMTP_BIN" ]; then if [ -z "$SMTP_BIN" ]; then
_err "The smtp notify-hook requires curl or Python, but can't find any." _err "The smtp notify-hook requires curl or Python, but can't find any."
_err 'If you have one of them, define SMTP_BIN="/path/to/curl_or_python".' _err 'If you have one of them, define SMTP_BIN="/path/to/curl_or_python".'
_err 'Otherwise, see if you can use the "mail" notify-hook instead.' _err 'Otherwise, see if you can use the "mail" notify-hook instead.'
return 1 return 1
fi fi
_debug "_SMTP_BIN" "$_SMTP_BIN"
fi fi
_debug SMTP_BIN "$SMTP_BIN"
_saveaccountconf_mutable_default SMTP_BIN "$SMTP_BIN"
SMTP_FROM="$(_readaccountconf_mutable_default SMTP_FROM)"
if [ -z "$SMTP_FROM" ]; then if [ -z "$SMTP_FROM" ]; then
_err "You must define SMTP_FROM as the sender email address." _err "You must define SMTP_FROM as the sender email address."
return 1 return 1
fi fi
_SMTP_FROM="$SMTP_FROM" _debug SMTP_FROM "$SMTP_FROM"
_saveaccountconf_mutable_default SMTP_FROM "$SMTP_FROM"
SMTP_TO="$(_readaccountconf_mutable_default SMTP_TO)"
if [ -z "$SMTP_TO" ]; then if [ -z "$SMTP_TO" ]; then
_err "You must define SMTP_TO as the recipient email address." _err "You must define SMTP_TO as the recipient email address."
return 1 return 1
fi fi
_SMTP_TO="$SMTP_TO" _debug SMTP_TO "$SMTP_TO"
_saveaccountconf_mutable_default SMTP_TO "$SMTP_TO"
SMTP_HOST="$(_readaccountconf_mutable_default SMTP_HOST)"
if [ -z "$SMTP_HOST" ]; then if [ -z "$SMTP_HOST" ]; then
_err "You must define SMTP_HOST as the SMTP server hostname." _err "You must define SMTP_HOST as the SMTP server hostname."
return 1 return 1
fi fi
_SMTP_HOST="$SMTP_HOST" _debug SMTP_HOST "$SMTP_HOST"
_saveaccountconf_mutable_default SMTP_HOST "$SMTP_HOST"
_SMTP_SECURE="${SMTP_SECURE:-none}" SMTP_SECURE="$(_readaccountconf_mutable_default SMTP_SECURE "$SMTP_SECURE_DEFAULT")"
case "$_SMTP_SECURE" in case "$SMTP_SECURE" in
"none") smtp_default_port="25" ;; "none") smtp_port_default="25" ;;
"ssl") smtp_default_port="465" ;; "ssl") smtp_port_default="465" ;;
"tls") smtp_default_port="587" ;; "tls") smtp_port_default="587" ;;
*) *)
_err "Invalid SMTP_SECURE='$SMTP_SECURE'. It must be 'ssl', 'tls' or 'none'." _err "Invalid SMTP_SECURE='$SMTP_SECURE'. It must be 'ssl', 'tls' or 'none'."
return 1 return 1
;; ;;
esac esac
_debug SMTP_SECURE "$SMTP_SECURE"
_saveaccountconf_mutable_default SMTP_SECURE "$SMTP_SECURE" "$SMTP_SECURE_DEFAULT"
_SMTP_PORT="${SMTP_PORT:-$smtp_default_port}" SMTP_PORT="$(_readaccountconf_mutable_default SMTP_PORT "$smtp_port_default")"
if [ -z "$SMTP_PORT" ]; then case "$SMTP_PORT" in
_debug "_SMTP_PORT" "$_SMTP_PORT" *[!0-9]*)
fi _err "Invalid SMTP_PORT='$SMTP_PORT'. It must be a port number."
return 1
;;
esac
_debug SMTP_PORT "$SMTP_PORT"
_saveaccountconf_mutable_default SMTP_PORT "$SMTP_PORT" "$smtp_port_default"
_SMTP_USERNAME="$SMTP_USERNAME" SMTP_USERNAME="$(_readaccountconf_mutable_default SMTP_USERNAME)"
_SMTP_PASSWORD="$SMTP_PASSWORD" _debug SMTP_USERNAME "$SMTP_USERNAME"
_SMTP_TIMEOUT="${SMTP_TIMEOUT:-30}" _saveaccountconf_mutable_default SMTP_USERNAME "$SMTP_USERNAME"
_SMTP_X_MAILER="${PROJECT_NAME} ${VER} --notify-hook smtp"
SMTP_PASSWORD="$(_readaccountconf_mutable_default SMTP_PASSWORD)"
_secure_debug SMTP_PASSWORD "$SMTP_PASSWORD"
_saveaccountconf_mutable_default SMTP_PASSWORD "$SMTP_PASSWORD"
SMTP_TIMEOUT="$(_readaccountconf_mutable_default SMTP_TIMEOUT "$SMTP_TIMEOUT_DEFAULT")"
_debug SMTP_TIMEOUT "$SMTP_TIMEOUT"
_saveaccountconf_mutable_default SMTP_TIMEOUT "$SMTP_TIMEOUT" "$SMTP_TIMEOUT_DEFAULT"
SMTP_X_MAILER="${PROJECT_NAME} ${VER} --notify-hook smtp"
# Run with --debug 2 (or above) to echo the transcript of the SMTP session. # Run with --debug 2 (or above) to echo the transcript of the SMTP session.
# Careful: this may include SMTP_PASSWORD in plaintext! # Careful: this may include SMTP_PASSWORD in plaintext!
if [ "${DEBUG:-$DEBUG_LEVEL_NONE}" -ge "$DEBUG_LEVEL_2" ]; then if [ "${DEBUG:-$DEBUG_LEVEL_NONE}" -ge "$DEBUG_LEVEL_2" ]; then
_SMTP_SHOW_TRANSCRIPT="True" SMTP_SHOW_TRANSCRIPT="True"
else else
_SMTP_SHOW_TRANSCRIPT="" SMTP_SHOW_TRANSCRIPT=""
fi fi
_debug SMTP_SUBJECT "$SMTP_SUBJECT"
_debug SMTP_CONTENT "$SMTP_CONTENT"
# Send the message: # Send the message:
case "$(basename "$_SMTP_BIN")" in case "$(basename "$SMTP_BIN")" in
curl) _smtp_send=_smtp_send_curl ;; curl) _smtp_send=_smtp_send_curl ;;
py*) _smtp_send=_smtp_send_python ;; py*) _smtp_send=_smtp_send_python ;;
*) *)
_err "Can't figure out how to invoke $_SMTP_BIN." _err "Can't figure out how to invoke '$SMTP_BIN'."
_err "Check your SMTP_BIN setting." _err "Check your SMTP_BIN setting."
return 1 return 1
;; ;;
esac esac
if ! smtp_output="$($_smtp_send)"; then if ! smtp_output="$($_smtp_send)"; then
_err "Error sending message with $_SMTP_BIN." _err "Error sending message with $SMTP_BIN."
if [ -n "$smtp_output" ]; then if [ -n "$smtp_output" ]; then
_err "$smtp_output" _err "$smtp_output"
fi fi
return 1 return 1
fi fi
# Save config only if send was successful:
_saveaccountconf_mutable SMTP_BIN "$SMTP_BIN"
_saveaccountconf_mutable SMTP_FROM "$SMTP_FROM"
_saveaccountconf_mutable SMTP_TO "$SMTP_TO"
_saveaccountconf_mutable SMTP_HOST "$SMTP_HOST"
_saveaccountconf_mutable SMTP_PORT "$SMTP_PORT"
_saveaccountconf_mutable SMTP_SECURE "$SMTP_SECURE"
_saveaccountconf_mutable SMTP_USERNAME "$SMTP_USERNAME"
_saveaccountconf_mutable SMTP_PASSWORD "$SMTP_PASSWORD"
_saveaccountconf_mutable SMTP_TIMEOUT "$SMTP_TIMEOUT"
return 0 return 0
} }
# Send the message via curl using _SMTP_* variables ##
## curl smtp sending
##
# Send the message via curl using SMTP_* variables
_smtp_send_curl() { _smtp_send_curl() {
# curl passes --mail-from and --mail-rcpt directly to the SMTP protocol without # curl passes --mail-from and --mail-rcpt directly to the SMTP protocol without
# additional parsing, and SMTP requires addr-spec only (no display names). # additional parsing, and SMTP requires addr-spec only (no display names).
# In the future, maybe try to parse the addr-spec out for curl args (non-trivial). # In the future, maybe try to parse the addr-spec out for curl args (non-trivial).
if _email_has_display_name "$_SMTP_FROM"; then if _email_has_display_name "$SMTP_FROM"; then
_err "curl smtp only allows a simple email address in SMTP_FROM." _err "curl smtp only allows a simple email address in SMTP_FROM."
_err "Change your SMTP_FROM='$SMTP_FROM' to remove the display name." _err "Change your SMTP_FROM='$SMTP_FROM' to remove the display name."
return 1 return 1
fi fi
if _email_has_display_name "$_SMTP_TO"; then if _email_has_display_name "$SMTP_TO"; then
_err "curl smtp only allows simple email addresses in SMTP_TO." _err "curl smtp only allows simple email addresses in SMTP_TO."
_err "Change your SMTP_TO='$SMTP_TO' to remove the display name(s)." _err "Change your SMTP_TO='$SMTP_TO' to remove the display name(s)."
return 1 return 1
@ -173,20 +168,20 @@ _smtp_send_curl() {
# Build curl args in $@ # Build curl args in $@
case "$_SMTP_SECURE" in case "$SMTP_SECURE" in
none) none)
set -- --url "smtp://${_SMTP_HOST}:${_SMTP_PORT}" set -- --url "smtp://${SMTP_HOST}:${SMTP_PORT}"
;; ;;
ssl) ssl)
set -- --url "smtps://${_SMTP_HOST}:${_SMTP_PORT}" set -- --url "smtps://${SMTP_HOST}:${SMTP_PORT}"
;; ;;
tls) tls)
set -- --url "smtp://${_SMTP_HOST}:${_SMTP_PORT}" --ssl-reqd set -- --url "smtp://${SMTP_HOST}:${SMTP_PORT}" --ssl-reqd
;; ;;
*) *)
# This will only occur if someone adds a new SMTP_SECURE option above # This will only occur if someone adds a new SMTP_SECURE option above
# without updating this code for it. # without updating this code for it.
_err "Unhandled _SMTP_SECURE='$_SMTP_SECURE' in _smtp_send_curl" _err "Unhandled SMTP_SECURE='$SMTP_SECURE' in _smtp_send_curl"
_err "Please re-run with --debug and report a bug." _err "Please re-run with --debug and report a bug."
return 1 return 1
;; ;;
@ -194,23 +189,23 @@ _smtp_send_curl() {
set -- "$@" \ set -- "$@" \
--upload-file - \ --upload-file - \
--mail-from "$_SMTP_FROM" \ --mail-from "$SMTP_FROM" \
--max-time "$_SMTP_TIMEOUT" --max-time "$SMTP_TIMEOUT"
# Burst comma-separated $_SMTP_TO into individual --mail-rcpt args. # Burst comma-separated $SMTP_TO into individual --mail-rcpt args.
_to="${_SMTP_TO}," _to="${SMTP_TO},"
while [ -n "$_to" ]; do while [ -n "$_to" ]; do
_rcpt="${_to%%,*}" _rcpt="${_to%%,*}"
_to="${_to#*,}" _to="${_to#*,}"
set -- "$@" --mail-rcpt "$_rcpt" set -- "$@" --mail-rcpt "$_rcpt"
done done
_smtp_login="${_SMTP_USERNAME}:${_SMTP_PASSWORD}" _smtp_login="${SMTP_USERNAME}:${SMTP_PASSWORD}"
if [ "$_smtp_login" != ":" ]; then if [ "$_smtp_login" != ":" ]; then
set -- "$@" --user "$_smtp_login" set -- "$@" --user "$_smtp_login"
fi fi
if [ "$_SMTP_SHOW_TRANSCRIPT" = "True" ]; then if [ "$SMTP_SHOW_TRANSCRIPT" = "True" ]; then
set -- "$@" --verbose set -- "$@" --verbose
else else
set -- "$@" --silent --show-error set -- "$@" --silent --show-error
@ -218,24 +213,24 @@ _smtp_send_curl() {
raw_message="$(_smtp_raw_message)" raw_message="$(_smtp_raw_message)"
_debug2 "curl command:" "$_SMTP_BIN" "$*" _debug2 "curl command:" "$SMTP_BIN" "$*"
_debug2 "raw_message:\n$raw_message" _debug2 "raw_message:\n$raw_message"
echo "$raw_message" | "$_SMTP_BIN" "$@" echo "$raw_message" | "$SMTP_BIN" "$@"
} }
# Output an RFC-822 / RFC-5322 email message using _SMTP_* variables # Output an RFC-822 / RFC-5322 email message using SMTP_* variables
_smtp_raw_message() { _smtp_raw_message() {
echo "From: $_SMTP_FROM" echo "From: $SMTP_FROM"
echo "To: $_SMTP_TO" echo "To: $SMTP_TO"
echo "Subject: $(_mime_encoded_word "$_SMTP_SUBJECT")" echo "Subject: $(_mime_encoded_word "$SMTP_SUBJECT")"
if _exists date; then if _exists date; then
echo "Date: $(date +'%a, %-d %b %Y %H:%M:%S %z')" echo "Date: $(date +'%a, %-d %b %Y %H:%M:%S %z')"
fi fi
echo "Content-Type: text/plain; charset=utf-8" echo "Content-Type: text/plain; charset=utf-8"
echo "X-Mailer: $_SMTP_X_MAILER" echo "X-Mailer: $SMTP_X_MAILER"
echo echo
echo "$_SMTP_CONTENT" echo "$SMTP_CONTENT"
} }
# Convert text to RFC-2047 MIME "encoded word" format if it contains non-ASCII chars # Convert text to RFC-2047 MIME "encoded word" format if it contains non-ASCII chars
@ -260,12 +255,16 @@ _email_has_display_name() {
expr "$_email" : '^.*[<>"]' >/dev/null expr "$_email" : '^.*[<>"]' >/dev/null
} }
# Send the message via Python using _SMTP_* variables ##
## Python smtp sending
##
# Send the message via Python using SMTP_* variables
_smtp_send_python() { _smtp_send_python() {
_debug "Python version" "$("$_SMTP_BIN" --version 2>&1)" _debug "Python version" "$("$SMTP_BIN" --version 2>&1)"
# language=Python # language=Python
"$_SMTP_BIN" <<EOF "$SMTP_BIN" <<PYTHON
# This code is meant to work with either Python 2.7.x or Python 3.4+. # This code is meant to work with either Python 2.7.x or Python 3.4+.
try: try:
try: try:
@ -279,20 +278,20 @@ except ImportError as err:
" a reduced version of Python unsuitable for sending mail: %s" % err) " a reduced version of Python unsuitable for sending mail: %s" % err)
exit(1) exit(1)
show_transcript = """$_SMTP_SHOW_TRANSCRIPT""" == "True" show_transcript = """$SMTP_SHOW_TRANSCRIPT""" == "True"
smtp_host = """$_SMTP_HOST""" smtp_host = """$SMTP_HOST"""
smtp_port = int("""$_SMTP_PORT""") smtp_port = int("""$SMTP_PORT""")
smtp_secure = """$_SMTP_SECURE""" smtp_secure = """$SMTP_SECURE"""
username = """$_SMTP_USERNAME""" username = """$SMTP_USERNAME"""
password = """$_SMTP_PASSWORD""" password = """$SMTP_PASSWORD"""
timeout=int("""$_SMTP_TIMEOUT""") # seconds timeout=int("""$SMTP_TIMEOUT""") # seconds
x_mailer="""$_SMTP_X_MAILER""" x_mailer="""$SMTP_X_MAILER"""
from_email="""$_SMTP_FROM""" from_email="""$SMTP_FROM"""
to_emails="""$_SMTP_TO""" # can be comma-separated to_emails="""$SMTP_TO""" # can be comma-separated
subject="""$_SMTP_SUBJECT""" subject="""$SMTP_SUBJECT"""
content="""$_SMTP_CONTENT""" content="""$SMTP_CONTENT"""
try: try:
msg = EmailMessage() msg = EmailMessage()
@ -330,5 +329,49 @@ except SocketError as err:
finally: finally:
if smtp is not None: if smtp is not None:
smtp.quit() smtp.quit()
EOF PYTHON
}
##
## Conf helpers
##
#_readaccountconf_mutable_default name default_value
# Given a name like MY_CONF:
# - if MY_CONF is set and non-empty, output $MY_CONF
# - if MY_CONF is set _empty_, output $default_value
# (lets user `export MY_CONF=` to clear previous saved value
# and return to default, without user having to know default)
# - otherwise if _readaccountconf_mutable $name is non-empty, return that
# (value of SAVED_MY_CONF from account.conf)
# - otherwise output $default_value
_readaccountconf_mutable_default() {
_name="$1"
_default_value="$2"
eval "_value=\"\$$_name\""
eval "_explicit_empty_value=\"\${${_name}+empty}\""
if [ -z "${_value}" ] && [ "${_explicit_empty_value:-}" != "empty" ]; then
_value="$(_readaccountconf_mutable "$_name")"
fi
if [ -z "${_value}" ]; then
_value="$_default_value"
fi
printf "%s" "$_value"
}
#_saveaccountconf_mutable_default name value default_value base64encode
# Like _saveaccountconf_mutable, but if value is default_value
# then _clearaccountconf_mutable instead
_saveaccountconf_mutable_default() {
_name="$1"
_value="$2"
_default_value="$3"
_base64encode="$4"
if [ "$_value" != "$_default_value" ]; then
_saveaccountconf_mutable "$_name" "$_value" "$_base64encode"
else
_clearaccountconf_mutable "$_name"
fi
} }