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fix(opencode): validate clipboard content type on Linux#23552
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On Linux, xclip/wl-paste output raw bytes even when clipboard contains text (not an image). The code only checked byteLength > 0, so text was incorrectly labeled as image/png and sent to the model, which failed with 'could not process image'. Use existing sniffAttachmentMime() to validate PNG magic bytes before returning clipboard content as an image. Fixes anomalyco#23458
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Issue for this PR
Closes #23458
Type of change
What does this PR do?
On Linux,
xclip -selection clipboard -t image/png -ooutputs raw bytes even when clipboard contains text (not an image). The code only checkedbyteLength > 0, so text like¯\_(ツ)_/¯was incorrectly labeled asimage/pngand sent to the model, which failed with "could not process image".This fix uses the existing
sniffAttachmentMime()function to validate PNG magic bytes before treating clipboard content as an image. This is the same pattern used in thereadtool.How did you verify your code works?
echo '¯\_(ツ)_/¯' | xclip -selection cScreenshots / recordings
N/A - not a UI change
Checklist