50 lines
2.0 KiB
Bash
Executable File
50 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# LaDOSE.DiscordBot reads its configuration from ./settings.json and from nothing else:
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# Program.cs builds a ConfigurationBuilder with AddJsonFile("settings.json") and no
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# AddEnvironmentVariables(), so a LADOSE_* variable would be invisible to it. This script
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# renders that file at container start instead — the same indirection LaDOSE.WebApp's
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# entrypoint uses to turn LADOSE_API_BASE_URL into /config.js. One image, any token.
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#
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# It writes only when LADOSE_DISCORD_TOKEN is set. Left unset, whatever settings.json is
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# already at /app wins: the placeholder baked in by the build, or a file bind-mounted over
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# it. Doing both — mounting settings.json read-only *and* setting the variable — fails
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# here with EROFS rather than silently ignoring one of them.
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set -eu
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settings_file=/app/settings.json
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# Drop control characters (newlines included) so a value cannot break out of its string
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# literal, then escape backslashes before double quotes. A token containing " or \ stays
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# inert data.
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json_string() {
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printf '%s' "${1:-}" | tr -d '\001-\037' | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g'
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}
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if [ -n "${LADOSE_DISCORD_TOKEN:-}" ]; then
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rest_url=${LADOSE_BOT_REST_URL:-http://api:5000}
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# All five keys, always. Program.cs calls .ToString() on each of them at startup, so a
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# missing one is a NullReferenceException before the bot ever reaches Discord.
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cat >"$settings_file" <<EOF
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{
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"Discord": {
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"Token": "$(json_string "${LADOSE_DISCORD_TOKEN}")"
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},
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"Challonge": {
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"Token": "$(json_string "${LADOSE_CHALLONGE_API_KEY:-}")"
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},
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"REST": {
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"Url": "$(json_string "${rest_url}")",
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"User": "$(json_string "${LADOSE_BOT_REST_USER:-}")",
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"Password": "$(json_string "${LADOSE_BOT_REST_PASSWORD:-}")"
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}
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}
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EOF
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# The token is deliberately not echoed.
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echo "settings.json: rendered from the environment (REST:Url=$rest_url)" >&2
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else
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echo "settings.json: LADOSE_DISCORD_TOKEN unset, using the file already at $settings_file" >&2
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fi
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exec "$@"
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