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| 1 | +#!/bin/bash |
| 2 | +# |
| 3 | +# Run htgettoken and then start a shell command and keep the access |
| 4 | +# token updated for as long as the command runs. If there is no |
| 5 | +# -o/--outfile htgettoken option and BEARER_TOKEN_FILE is not already |
| 6 | +# set, choose a unique location and set BEARER_TOKEN_FILE to point |
| 7 | +# to the token. If there is no --vaulttokenfile option, the vault token |
| 8 | +# will be stored in a file name based on a hash of the arguments given, |
| 9 | +# so that multiple httokensh commands run by the same user on the same |
| 10 | +# machine with the same options will share a vault token and otherwise |
| 11 | +# will get a different vault token. The access token will be renewed |
| 12 | +# just under --minsecs seconds (default 60) before it is set to expire. |
| 13 | +# Output from the background htgettoken goes to $BEARER_TOKEN_FILE.log. |
| 14 | + |
| 15 | +usage() |
| 16 | +{ |
| 17 | + echo "Usage: httokensh [-h] [htgettokenoptions] -- [command]" |
| 18 | + echo |
| 19 | + echo "Runs htgettoken with given options, starts the command, and runs" |
| 20 | + echo "htgettoken again in the background as needed to renew the token" |
| 21 | + echo "until the command exits." |
| 22 | + echo |
| 23 | + echo "Options:" |
| 24 | + echo " -h, --help show this help message and exit" |
| 25 | + echo |
| 26 | + echo "command defaults to \$SHELL" |
| 27 | + exit 1 |
| 28 | +} >&2 |
| 29 | + |
| 30 | +if [ $# = 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then |
| 31 | + usage |
| 32 | +fi |
| 33 | + |
| 34 | +HTGETOKENARGS=() |
| 35 | +COMMANDARGS=() |
| 36 | +GOTSEP=false |
| 37 | +MINSECS=60 |
| 38 | +GOTVERBOSE=false |
| 39 | +GOTOUTFILE=false |
| 40 | +GOTVTFILE=false |
| 41 | +for ARG; do |
| 42 | + if $GOTSEP; then |
| 43 | + COMMANDARGS+=("$ARG") |
| 44 | + elif [ "$ARG" = "--" ]; then |
| 45 | + GOTSEP=true |
| 46 | + else |
| 47 | + HTGETTOKENARGS+=("$ARG") |
| 48 | + case "$ARG" in |
| 49 | + --minsecs=*) |
| 50 | + MINSECS="${ARG/--minsecs=/}" |
| 51 | + ;; |
| 52 | + -v|--verbose) |
| 53 | + GOTVERBOSE=true |
| 54 | + ;; |
| 55 | + -o|--outfile=*) |
| 56 | + GOTOUTFILE=true |
| 57 | + ;; |
| 58 | + --vaulttokenfile=*) |
| 59 | + GOTVTFILE=true |
| 60 | + ;; |
| 61 | + esac |
| 62 | + fi |
| 63 | +done |
| 64 | + |
| 65 | +if ! $GOTSEP; then |
| 66 | + echo "No -- separator given" >&2 |
| 67 | + usage |
| 68 | +fi |
| 69 | + |
| 70 | +if [ ${#HTGETTOKENARGS[@]} = 0 ]; then |
| 71 | + echo "No htgettoken options given" >&2 |
| 72 | + usage |
| 73 | +fi |
| 74 | + |
| 75 | +if [ ${#COMMANDARGS[@]} = 0 ]; then |
| 76 | + COMMANDARGS=("$SHELL") |
| 77 | +fi |
| 78 | + |
| 79 | +if [ -z "$BEARER_TOKEN_FILE" ] && ! $GOTOUTFILE; then |
| 80 | + BTFILE="bt_u$(id -u).sh-$$" |
| 81 | + if [ -n "$XDG_RUNTIME_DIR" ]; then |
| 82 | + BEARER_TOKEN_FILE=$XDG_RUNTIME_DIR/$BTFILE |
| 83 | + else |
| 84 | + BEARER_TOKEN_FILE=/tmp/$BTFILE |
| 85 | + fi |
| 86 | + export BEARER_TOKEN_FILE |
| 87 | +fi |
| 88 | + |
| 89 | +if ! $GOTVTFILE; then |
| 90 | + ARGHASH="$(echo "${HTGETTOKENARGS[@]}"|md5sum -)" |
| 91 | + ARGHASH="${ARGHASH%% *}" |
| 92 | + VTFILE="/tmp/vt_u$(id -u).sh-$ARGHASH" |
| 93 | + HTGETTOKENARGS+=("--vaulttokenfile=$VTFILE") |
| 94 | +fi |
| 95 | + |
| 96 | +gettoken() |
| 97 | +{ |
| 98 | + htgettoken "${HTGETTOKENARGS[@]}" |
| 99 | + RETVAL="$?" |
| 100 | + if [ $RETVAL != 0 ]; then |
| 101 | + echo "htgettoken failed, $1" >&2 |
| 102 | + exit $RETVAL |
| 103 | + fi |
| 104 | + |
| 105 | + TOKENJSON="$(htdecodetoken)" |
| 106 | + RETVAL="$?" |
| 107 | + if [ $RETVAL != 0 ]; then |
| 108 | + echo "htdecodetoken failed, $1" >&2 |
| 109 | + exit $RETVAL |
| 110 | + fi |
| 111 | + |
| 112 | + EXP="$(echo $TOKENJSON|jq .exp)" |
| 113 | + NOW="$(date +%s)" |
| 114 | + let SLEEPSECS="$EXP - $MINSECS - $NOW + 2" |
| 115 | + if [ "$SLEEPSECS" -lt $2 ]; then |
| 116 | + echo "Calculated renewal time of $SLEEPSECS seconds is less than $2, $1" |
| 117 | + exit 1 |
| 118 | + fi |
| 119 | +} |
| 120 | + |
| 121 | +# The first time it is possible to get a cached token that is barely |
| 122 | +# beyond the minsecs, so reduce the minimum to just 1 second |
| 123 | +gettoken "not running command" 1 |
| 124 | + |
| 125 | +# make sure the logged info is verbose for easier diagnosis |
| 126 | +if ! $GOTVERBOSE; then |
| 127 | + HTGETTOKENARGS+=("-v") |
| 128 | +fi |
| 129 | + |
| 130 | +# enable job control so background processes get their own process group |
| 131 | +set -m |
| 132 | + |
| 133 | +echo "Renewal log is at \$BEARER_TOKEN_FILE.log" |
| 134 | +{ |
| 135 | + echo htgettoken args are "${HTGETTOKENARGS[@]}" |
| 136 | + while true; do |
| 137 | + date |
| 138 | + echo "Renewal scheduled in $SLEEPSECS seconds" |
| 139 | + sleep $SLEEPSECS |
| 140 | + date |
| 141 | + if kill -0 $PPID; then |
| 142 | + gettoken "exiting" 60 |
| 143 | + else |
| 144 | + echo "Parent process $PPID not running, exiting" |
| 145 | + exit 0 |
| 146 | + fi |
| 147 | + done |
| 148 | +} >$BEARER_TOKEN_FILE.log 2>&1 & |
| 149 | + |
| 150 | +BACKGROUND_PID=$! |
| 151 | + |
| 152 | +cleanup() |
| 153 | +{ |
| 154 | + if kill -- -$BACKGROUND_PID 2>/dev/null; then |
| 155 | + wait 2>/dev/null |
| 156 | + rm -f $BEARER_TOKEN_FILE $BEARER_TOKEN_FILE.log |
| 157 | + else |
| 158 | + echo >&2 |
| 159 | + echo "Renewal background process failed, see $BEARER_TOKEN_FILE.log" >&2 |
| 160 | + exit 1 |
| 161 | + fi |
| 162 | +} |
| 163 | + |
| 164 | +trap cleanup 0 |
| 165 | + |
| 166 | +"${COMMANDARGS[@]}" |
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