jialuohu Draft or send Gmail
REQUIRED: Apply gws-shared first. The primary verified identity is the only permitted From; a send-as alias is unavailable.
Authoritative draft preview
Always create a server-side draft first with
"$gws_bin" gmail +send --from "$expected_email" --to <recipients> --subject <subject> --body <body> --draft
in the exact isolated environment. Parse exactly one draft ID from the helper's
JSON result; zero, duplicate, or malformed IDs fail closed. Fetch that ID with
raw users.drafts.get using the full format.
The gws v0.22.5 schema defines gmail.users.drafts.get with required
userId and id parameters plus format=full, and
gmail.users.drafts.send with required userId parameters plus a Draft
request body. After shared preflight, use this exact isolated runner and
JSON-encode the parsed ID rather than interpolating it:
isolated_gws() (
cd / || exit 1
/usr/bin/env -u GOOGLE_WORKSPACE_CLI_TOKEN \
-u GOOGLE_WORKSPACE_CLI_CREDENTIALS_FILE \
-u GOOGLE_WORKSPACE_CLI_CREDENTIAL_FILE \
-u GOOGLE_WORKSPACE_CLI_CLIENT_ID \
-u GOOGLE_WORKSPACE_CLI_CLIENT_SECRET \
-u GOOGLE_WORKSPACE_CLI_LOG \
-u GOOGLE_WORKSPACE_CLI_LOG_FILE \
-u GOOGLE_WORKSPACE_PROJECT_ID \
-u GOOGLE_WORKSPACE_CLI_SANITIZE_TEMPLATE \
-u GOOGLE_WORKSPACE_CLI_SANITIZE_MODE \
-u GOOGLE_APPLICATION_CREDENTIALS \
GOOGLE_WORKSPACE_CLI_CONFIG_DIR="$profile" \
GOOGLE_WORKSPACE_CLI_KEYRING_BACKEND=file \
GOOGLE_APPLICATION_CREDENTIALS="$profile/missing-adc.json" \
"$gws_bin" "$@"
)
draft_get_params="$(
DRAFT_ID="$draft_id" /usr/bin/python3 -I - <<'PY'
import json
import os
print(json.dumps({
"userId": "me",
"id": os.environ["DRAFT_ID"],
"format": "full",
}, separators=(",", ":")))
PY
)" || exit 1
draft_json="$(isolated_gws gmail users drafts get --params "$draft_get_params")" || exit 1
Treat the full draft readback as authoritative. Validate the actual From
case-insensitively against $expected_email; validate actual To/CC/BCC,
subject, new-message thread context, and attachment names and count against the
request and staged inputs. Recursively base64url-decode every inline
text/plain and text/html MIME leaf in draft.message.payload; preserve the
API part order and build a canonical MIME content digest from each part path,
lowercase MIME type, decoded byte length, and SHA-256 of its decoded bytes.
Validate decoded body content against the requested body and any expected
helper-generated MIME structure. Missing or undecodable body bytes fail closed.
Preview the decoded body content as non-executable text plus the canonical MIME
content digest in the identity/recipient preview; never render active HTML.
Preview the readback, including draft state. A draft-only request stops after
this preview.
Optional send-now boundary
Only explicit user intent to send now is pre-authorization. Immediately before
sending, perform another full users.drafts.get and require an immediate
unchanged readback of the exact newly created draft, including From, To/CC/BCC,
subject, thread context, attachment names and count, decoded body bytes and
canonical MIME content digest. Then, and only then, encode that same ID as the
entire Draft request body and invoke the exact isolated raw send:
draft_json_again="$(isolated_gws gmail users drafts get --params "$draft_get_params")" || exit 1
draft_send_body="$(
DRAFT_ID="$draft_id" /usr/bin/python3 -I - <<'PY'
import json
import os
print(json.dumps({"id": os.environ["DRAFT_ID"]}, separators=(",", ":")))
PY
)" || exit 1
isolated_gws gmail users drafts send --params '{"userId":"me"}' --json "$draft_send_body" || exit 1
Any mismatch, deadline, prior draft, or ambiguous request must fail closed;
never rebuild or send with users.messages.send.
Attachment staging
Apply the shared attachment safety contract independently to each attachment:
perform the initial lstat, canonical device/inode, SHA-256, and byte size
record; create a private temporary directory; copy the exact bytes to a
mode-600 file with the same basename; perform the post-copy original restat
and rehash; and require the staged digest to match. Preview the original
absolute path, basename, size and digest. Perform the final staged digest check,
pass only the staged copy to gws, and cleanup on every exit. Never pass the
mutable user-supplied path.