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mk-jwt-token -- bash shell script for generating JWT tokens. requires `openssl` and `base64` which you have.
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#!/usr/bin/env bash | |
# | |
# usage: JWT_SECRET="silly" mk-jwt-token | |
# @WARN: modify the payload and header to your needs. | |
# | |
main(){ | |
set -eo pipefail | |
[ -n "$JWT_SECRET" ] || die "JWT_SECRET environment variable is not set." | |
# number of seconds to expire token. default 1h | |
expire_seconds="${JWT_EXPIRATION_IN_SECONDS:-3600}" | |
# pass JWT_SECRET_BASE64_ENCODED as true if secret is base64 encoded | |
${JWT_SECRET_BASE64_ENCODED:-false} && \ | |
JWT_SECRET=$(printf %s "$JWT_SECRET" | base64 --decode) | |
header='{ | |
"alg": "HS256", | |
"typ": "JWT" | |
}' | |
payload="{ | |
\"iss\": \"testing.iceburg.net\", | |
\"iat\": $(date +%s), | |
\"exp\": $(($(date +%s)+expire_seconds)), | |
\"nbf\": $(($(date +%s)-1)) | |
}" | |
header_base64=$(printf %s "$header" | base64_urlencode) | |
payload_base64=$(printf %s "$payload" | base64_urlencode) | |
signed_content="${header_base64}.${payload_base64}" | |
signature=$(printf %s "$signed_content" | openssl dgst -binary -sha256 -hmac "$JWT_SECRET" | base64_urlencode) | |
log "generated JWT token. expires in $expire_seconds seconds -->\\n\\n" | |
printf '%s' "${signed_content}.${signature}" | |
} | |
base64_urlencode() { openssl enc -base64 -A | tr '+/' '-_' | tr -d '='; } | |
readonly __entry=$(basename "$0") | |
log(){ echo -e "$__entry: $*" >&2; } | |
die(){ log "$*"; exit 1; } | |
main "$@" |
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