Add gh.sh wrapper for gh CLI commands in workflows

scripts/gh.sh

@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Wrapper around gh CLI that only allows specific subcommands and flags.
+# All commands are scoped to the current repository via GH_REPO or GITHUB_REPOSITORY.
+#
+# Usage:
+#   ./scripts/gh.sh issue view 123
+#   ./scripts/gh.sh issue view 123 --comments
+#   ./scripts/gh.sh issue list --state open --limit 20
+#   ./scripts/gh.sh search issues "search query" --limit 10
+#   ./scripts/gh.sh label list --limit 100
+
+ALLOWED_FLAGS=(--comments --state --limit --label)
+FLAGS_WITH_VALUES=(--state --limit --label)
+
+SUB1="${1:-}"
+SUB2="${2:-}"
+CMD="$SUB1 $SUB2"
+case "$CMD" in
+  "issue view"|"issue list"|"search issues"|"label list")
+    ;;
+  *)
+    exit 1
+    ;;
+esac
+
+shift 2
+
+# Separate flags from positional arguments
+POSITIONAL=()
+FLAGS=()
+skip_next=false
+for arg in "$@"; do
+  if [[ "$skip_next" == true ]]; then
+    FLAGS+=("$arg")
+    skip_next=false
+  elif [[ "$arg" == -* ]]; then
+    flag="${arg%%=*}"
+    matched=false
+    for allowed in "${ALLOWED_FLAGS[@]}"; do
+      if [[ "$flag" == "$allowed" ]]; then
+        matched=true
+        break
+      fi
+    done
+    if [[ "$matched" == false ]]; then
+      exit 1
+    fi
+    FLAGS+=("$arg")
+    # If flag expects a value and isn't using = syntax, skip next arg
+    if [[ "$arg" != *=* ]]; then
+      for vflag in "${FLAGS_WITH_VALUES[@]}"; do
+        if [[ "$flag" == "$vflag" ]]; then
+          skip_next=true
+          break
+        fi
+      done
+    fi
+  else
+    POSITIONAL+=("$arg")
+  fi
+done
+
+REPO="${GH_REPO:-${GITHUB_REPOSITORY:-}}"
+
+if [[ "$CMD" == "search issues" ]]; then
+  if [[ -z "$REPO" ]]; then
+    exit 1
+  fi
+  QUERY="${POSITIONAL[0]:-}"
+  QUERY_LOWER=$(echo "$QUERY" | tr '[:upper:]' '[:lower:]')
+  if [[ "$QUERY_LOWER" == *"repo:"* || "$QUERY_LOWER" == *"org:"* || "$QUERY_LOWER" == *"user:"* ]]; then
+    exit 1
+  fi
+  gh "$SUB1" "$SUB2" "$QUERY" --repo "$REPO" "${FLAGS[@]}"
+else
+  # Reject URLs in positional args to prevent cross-repo access
+  for pos in "${POSITIONAL[@]}"; do
+    if [[ "$pos" == http://* || "$pos" == https://* ]]; then
+      exit 1
+    fi
+  done
+  gh "$SUB1" "$SUB2" "${POSITIONAL[@]}" "${FLAGS[@]}"
+fi