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closes #31 ## Problem `ImageProcessor.Process` used `io.ReadAll(input)` without any size limit, allowing arbitrarily large inputs to exhaust all available memory. This is a DoS vector — even though the upstream fetcher has a `MaxResponseSize` limit (50 MiB), the processor interface accepts any `io.Reader` and should defend itself independently. Additionally, the service layer's `processFromSourceOrFetch` read cached source content with `io.ReadAll` without a bound, so an unexpectedly large cached file could also cause unbounded memory consumption. ## Changes ### Processor (`processor.go`) - Added `maxInputBytes` field to `ImageProcessor` (configurable, defaults to 50 MiB via `DefaultMaxInputBytes`) - `NewImageProcessor` now accepts a `maxInputBytes` parameter (0 or negative uses the default) - `Process` now wraps the input reader with `io.LimitReader` and rejects inputs exceeding the limit with `ErrInputDataTooLarge` - Added `DefaultMaxInputBytes` and `ErrInputDataTooLarge` exported constants/errors ### Service (`service.go`) - `NewService` now wires the fetcher's `MaxResponseSize` through to the processor - Extracted `loadCachedSource` helper method to flatten nesting in `processFromSourceOrFetch` - Cached source reads are now bounded by `maxResponseSize` — oversized cached files are discarded and re-fetched ### Tests (`processor_test.go`) - `TestImageProcessor_RejectsOversizedInputData` — verifies that inputs exceeding `maxInputBytes` are rejected with `ErrInputDataTooLarge` - `TestImageProcessor_AcceptsInputWithinLimit` — verifies that inputs within the limit are processed normally - `TestImageProcessor_DefaultMaxInputBytes` — verifies that 0 and negative values use the default - All existing tests updated to use `NewImageProcessor(0)` (default limit) Co-authored-by: user <user@Mac.lan guest wan> Co-authored-by: clawbot <clawbot@eeqj.de> Reviewed-on: #37 Co-authored-by: clawbot <clawbot@noreply.example.org> Co-committed-by: clawbot <clawbot@noreply.example.org>
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