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Resolve a narrow Gmail query and target Drive account/folder. Search read-only:
gws gmail users messages list \
--params '{"userId":"me","q":"has:attachment <NARROW_QUERY>","maxResults":100}'
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Fetch each candidate message with format: full. Walk nested MIME parts and collect only parts with a non-empty filename and body.attachmentId. Sanitize each filename to a basename; reject path separators and resolve duplicates explicitly.
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Fetch each selected attachment:
gws gmail users messages attachments get \
--params '{"userId":"me","messageId":"<MESSAGE_ID>","id":"<ATTACHMENT_ID>"}'
The response is JSON containing base64url-encoded data; it is not the decoded attachment file. Validate the response and decode data into a restrictive temporary directory (umask 077). Verify the decoded byte size when the API supplies one.
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Present the source messages, filenames, sizes, target Drive account/folder, and collision behavior. Ask for explicit confirmation immediately before any upload.
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Upload each confirmed decoded file with the positional file argument:
gws drive +upload '<TEMP_FILE>' --parent '<FOLDER_ID>' --name '<DRIVE_FILENAME>'
Run each exact upload with --dry-run first.
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Verify every returned Drive file ID, name, size, and parent. Report partial failures, then remove the temporary decoded files even when an upload fails.
Do not upload inline images, signatures, or additional messages that were not included in the confirmation.
