• docs/guide/leases.md
  • Added a detailed example for configuring and using the Cloudflare lease backend.
  • Updated the lease backend comparison table to include the new Cloudflare entry.
• docs/leases/cloudflare.md
  • Created new documentation detailing the Cloudflare lease backend's configuration, prerequisites, credentials produced, limits, and examples.
• src/lease_backends/cloudflare.rs
  • Implemented the CloudflareBackend struct and its LeaseBackend trait methods for creating and revoking Cloudflare API tokens.
  • Included logic for handling API requests, error responses, and substituting account_id placeholders in policies.
• src/lease_backends/mod.rs
  • Added the cloudflare module to the lease_backends module.
  • Extended LeaseBackendConfig enum with a Cloudflare variant.
  • Implemented prerequisite checks and backend instantiation for the Cloudflare lease type.
  • Added a default environment variable name for Cloudflare tokens.

• No human activity (comments, reviews, etc.) has been recorded on this pull request yet.

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1. src/lease_backends/cloudflare.rs, line 129-135 (link)

   Empty resources map per policy is not validated

   build_api_policies correctly guards against empty permission_groups (line 130) but has no equivalent check for empty resources. A user can configure:

   [[leases.cf.policies]]
   effect = "allow"
   permission_groups = [{ id = "abc123" }]
   # resources omitted → deserializes as empty IndexMap

   This generates "resources": {} in the API body. Cloudflare's API requires at least one resource scope per policy and will reject this with a validation error, leaving the user with an opaque API-level message rather than a clear configuration hint.

   Adding a parallel check alongside the permission_groups one would catch this early:

   if p.permission_groups.is_empty() {
       return Err(FnoxError::Config(
           "Cloudflare backend: each policy must have at least one permission group."
               .to_string(),
       ));
   }
   if p.resources.is_empty() {
       return Err(FnoxError::Config(
           "Cloudflare backend: each policy must have at least one resource scope.".to_string(),
       ));
   }

2. src/lease_backends/mod.rs, line 62-64 (link)

   Default env_var shadows the parent authentication token

   The default output env_var is "CLOUDFLARE_API_TOKEN" — the exact same variable that get_api_token() reads to authenticate as the parent token. Any user who applies the lease credentials to their shell (e.g., eval $(fnox lease create --format env cf)) will overwrite their parent token with the child token. Since the child token typically lacks "API Tokens: Edit" permission, all subsequent fnox operations in that shell session (revocation, creating new leases) will fail with an authorization error.

   The documentation example in docs/leases/cloudflare.md encourages this eval pattern. Consider:

   1. Choosing a different default var name (e.g., CLOUDFLARE_LEASE_TOKEN) that does not collide with the authentication credential, or
   2. Adding a prominent documentation warning that users must preserve their parent CLOUDFLARE_API_TOKEN before evaling the output if they intend to run further fnox commands in the same shell.