118 lines
5.2 KiB
Bash
118 lines
5.2 KiB
Bash
#!/usr/bin/env bash
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# Scribe — PreToolUse rule arm for ACTIONS (#3476).
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#
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# The sibling of scribe_prior_art.sh. That hook is registered on Write|Edit and
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# asks "what is recorded about the file being written". This one asks "does a
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# standing rule speak to the command about to be run" — the question nothing
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# could ask before, and the reason every rule about which tool to reach for had
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# to live in the preload instead, back when there was one.
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#
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# WHY A HOOK AND NOT AN INSTRUCTION. A reflex generates no query (note #3089):
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# you reach for `curl` confidently, with no moment of doubt, so a surface that
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# waits to be asked never fires. Here nothing is asked — the tool call IS the
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# query, and the reflex has to become a tool call before it can do anything.
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#
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# SILENT ON OUTAGE, deliberately, unlike the prior-art hook. A write is
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# occasional; a Bash call is not, and an "instance did not answer" line before
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# every command is the noise that gets a channel muted. scribe_prior_art.sh
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# still speaks for both when the instance is down.
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#
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# Env:
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# SCRIBE_URL / SCRIBE_TOKEN override for the settings.json dogfooding path.
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command -v jq >/dev/null 2>&1 || exit 0
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command -v curl >/dev/null 2>&1 || exit 0
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# PreToolUse delivers { session_id, cwd, tool_name, tool_input: {...}, ... }
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event=$(cat 2>/dev/null || true)
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tool_name=$(printf '%s' "$event" | jq -r '.tool_name // empty' 2>/dev/null) || exit 0
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session_id=$(printf '%s' "$event" | jq -r '.session_id // empty' 2>/dev/null) || session_id=""
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event_cwd=$(printf '%s' "$event" | jq -r '.cwd // empty' 2>/dev/null) || event_cwd=""
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[ -n "$tool_name" ] || exit 0
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# The action, as text. `.command` is Bash's field; the fallbacks let the matcher
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# in hooks.json widen to other tools without this script changing — which is the
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# whole reason the server side takes a name and a string rather than a schema.
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command_text=$(printf '%s' "$event" | jq -r '
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.tool_input.command //
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.tool_input.url //
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.tool_input.prompt //
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empty' 2>/dev/null) || command_text=""
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[ -n "$command_text" ] || exit 0
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# shellcheck source=plugin/hooks/scribe_defs.sh
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. "$(dirname "${BASH_SOURCE[0]}")/scribe_defs.sh"
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# scribe_config, not a hand-rolled pair of parameter expansions: it also treats
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# an UNEXPANDED `${...}` placeholder as unset, which would otherwise be sent as
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# a garbage Bearer token and 401 on every call (#2198's class).
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scribe_config || exit 0
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# Bounded before encoding: a heredoc or a pasted script can be enormous, and
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# the verb and its target — the part a rule is about — sit at the front. The
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# server bounds it again; this keeps a huge payload off the wire in the first
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# place. `head -c`, never `cut -c`: cut truncates each LINE and caps nothing.
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command_text=$(printf '%s' "$command_text" | head -c 2000)
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# -sRr, never -rR: jq -R without -s reads LINE BY LINE, so a multi-line command
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# would encode per line and join with raw newlines — an invalid URL.
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cmd_enc=$(printf '%s' "$command_text" | jq -sRr '@uri' 2>/dev/null) || exit 0
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tool_enc=$(printf '%s' "$tool_name" | jq -sRr '@uri' 2>/dev/null) || exit 0
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repo_q=""
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lookup_dir=${event_cwd:-${CLAUDE_PROJECT_DIR:-$PWD}}
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repo_remote=$(git -C "$lookup_dir" remote get-url origin 2>/dev/null || true)
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if [ -n "$repo_remote" ]; then
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repo_enc=$(printf '%s' "$repo_remote" | jq -sRr '@uri' 2>/dev/null) || repo_enc=""
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[ -n "$repo_enc" ] && repo_q="&repo=${repo_enc}"
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fi
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# THE SHARED SESSION LEDGER, and the thing most worth getting right here.
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#
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# scribe_prior_art.sh keeps the rules it has already named in
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# <state>/<sid>.rules.ids and passes them as exclude_rule_ids. This hook reads
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# and appends to that SAME file rather than keeping its own: two ledgers would
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# mean a rule named by one arm gets re-offered by the other, and the hint that
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# fires most often is exactly the one that must not repeat itself.
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#
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# The directory keeps the prior-art name on purpose — renaming it would orphan
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# every live session's state for a cosmetic gain.
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state_dir="${TMPDIR:-/tmp}/scribe-priorart"
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mkdir -p "$state_dir" 2>/dev/null || true
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rulefile=""
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rule_exclude_q=""
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if [ -n "$session_id" ]; then
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safe_sid=$(printf '%s' "$session_id" | tr -c 'A-Za-z0-9._-' '_')
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rulefile="$state_dir/${safe_sid}.rules.ids"
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# Ageing, not a flat read (#3751): an id named two hours ago is not one the
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# session is still holding. scribe_rules_live carries the reasoning.
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rule_seen=$(scribe_rules_live "$rulefile")
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[ -n "$rule_seen" ] && rule_exclude_q="&exclude_rule_ids=${rule_seen}"
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fi
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# `|| exit 0` here, unlike the prior-art hook: there is no local arm whose
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# finding would be discarded, and an outage line before every command is worse
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# than silence. See the header.
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body=$(curl -fsS --max-time 5 \
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-H "Authorization: Bearer ${token}" \
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"${url%/}/api/plugin/tool-rules?tool=${tool_enc}&command=${cmd_enc}${repo_q}${rule_exclude_q}" 2>/dev/null) || exit 0
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context=$(printf '%s' "$body" | jq -r '.context // empty' 2>/dev/null) || exit 0
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[ -n "$context" ] || exit 0
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# Remember what was named so it is not repeated this session.
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if [ -n "$rulefile" ]; then
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printf '%s' "$body" | jq -r '(.rule_ids // [])[]?' 2>/dev/null \
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| scribe_rules_append "$rulefile"
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fi
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jq -cn --arg ctx "$context" '{
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hookSpecificOutput: {
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hookEventName: "PreToolUse",
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additionalContext: $ctx
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}
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}' 2>/dev/null || true
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exit 0
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