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# frozen_string_literal: true
module Dispatch
module Tool
module Files
module Sandbox
module_function
def resolve_path(path, worktree_path:)
worktree_real = File.realpath(worktree_path)
# Join the path against the worktree root
joined = File.expand_path(path, worktree_real)
# Check the expanded (logical) path first — catches ../traversal and absolute paths
unless joined.start_with?("#{worktree_real}/") || joined == worktree_real
raise SandboxError, "Path '#{path}' resolves outside the worktree sandbox"
end
# For existing paths, resolve symlinks and verify the real path
if File.exist?(joined)
real = File.realpath(joined)
unless real.start_with?("#{worktree_real}/") || real == worktree_real
raise SandboxError, "Path '#{path}' resolves outside the worktree sandbox (symlink escape)"
end
real
else
# For non-existent paths, resolve as much of the existing prefix as possible
# to catch symlinked directory components pointing outside the worktree
parts = joined.delete_prefix("#{worktree_real}/").split("/")
current = worktree_real
parts.each_with_index do |part, i|
candidate = File.join(current, part)
if File.symlink?(candidate)
real_target = File.realpath(candidate)
unless real_target.start_with?("#{worktree_real}/") || real_target == worktree_real
raise SandboxError, "Path '#{path}' resolves outside the worktree sandbox (symlink escape)"
end
current = real_target
elsif File.exist?(candidate)
current = File.realpath(candidate)
else
# Remainder of the path doesn't exist on disk — that's fine, return the logical path
remaining = parts[(i + 1)..]
return remaining.empty? ? candidate : File.join(candidate, *remaining)
end
end
current
end
end
def within_worktree?(path, worktree_path:)
resolve_path(path, worktree_path:)
true
rescue SandboxError
false
end
end
end
end
end
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