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fix(mistral): translate file_data to document_url in chat messages
When a user sends an OpenAI-format 'type: file' content block with
file_data (a base64 data URI) to a Mistral backend, LiteLLM was
passing the payload through untranslated. Mistral rejects it because
it only accepts 'type: document_url'.
_handle_message_with_file now handles two cases:
- file_data present → {type: document_url, document_url: }
- file_id present → {type: file, file_id: <id>} (existing behaviour)
Fixes #25531
This commit is contained in:
Claude
parent
f2f2a91a29
commit
d90490f541
2 changed files with 110 additions and 18 deletions
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@ -303,21 +303,28 @@ class MistralConfig(OpenAIGPTConfig):
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self, messages: List[AllMessageValues]
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) -> List[AllMessageValues]:
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"""
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Mistral API supports only 'file_id' in message content with type 'file'.
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Translate OpenAI 'file' content blocks to Mistral-native formats:
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- file_data (base64 data URI) → {"type": "document_url", "document_url": }
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- file_id (uploaded file ID) → {"type": "file", "file_id": <id>}
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"""
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for m in messages:
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_content_block = m.get("content")
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if _content_block and isinstance(_content_block, list):
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if any(c.get("type") == "file" for c in _content_block):
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# If file content is present, we get file_id from 'file' attribute of content block
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# then replace 'file' with 'file_id' and assign the value of 'file_id' attribute to it.
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file_contents = [
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c for c in _content_block if c.get("type") == "file"
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]
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for file_content in file_contents:
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file_id = file_content.get("file", {}).get("file_id")
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if file_id:
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# Replace 'file' with 'file_id'
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file_obj = file_content.get("file", {})
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file_data = file_obj.get("file_data")
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file_id = file_obj.get("file_id")
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if file_data:
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# Mistral does not accept 'file_data'; translate to document_url
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file_content["type"] = "document_url" # type: ignore
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file_content["document_url"] = file_data # type: ignore
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file_content.pop("file", None)
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elif file_id:
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# Replace 'file' wrapper with flat 'file_id' key
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file_content["file_id"] = file_id # type: ignore
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file_content.pop("file", None)
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return messages
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@ -344,9 +351,9 @@ class MistralConfig(OpenAIGPTConfig):
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# Handle both string and list content, preserving original format
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if isinstance(existing_content, str):
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# String content - prepend reasoning prompt
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new_content: Union[
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str, list
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] = f"{reasoning_prompt}\n\n{existing_content}"
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new_content: Union[str, list] = (
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f"{reasoning_prompt}\n\n{existing_content}"
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)
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elif isinstance(existing_content, list):
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# List content - prepend reasoning prompt as text block
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new_content = [
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@ -649,9 +649,10 @@ class TestMistralEmptyContentHandling:
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message = {"role": "assistant", "content": "Hello"}
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assert MistralConfig._is_empty_assistant_message(message) is False
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class TestMistralFileHandling:
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"""Test suite for Mistral file handling functionality."""
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def test_handle_file_message_with_file_id(self):
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"""Test that file messages with file_id are handled correctly."""
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mistral_config = MistralConfig()
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@ -660,8 +661,8 @@ class TestMistralFileHandling:
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"role": "user",
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"content": [
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{"type": "text", "text": "Please review this file."},
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{"type": "file", "file": {"file_id": "file-12345"}}
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]
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{"type": "file", "file": {"file_id": "file-12345"}},
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],
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}
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]
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casted_message = cast(list[AllMessageValues], messages)
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@ -674,7 +675,7 @@ class TestMistralFileHandling:
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# Check that file type is preserved
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assert result[0]["content"][1]["type"] == "file"
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# Check that file_id is modified to match Mistral's expected format
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assert result[0]["content"][1]["file_id"] == "file-12345" # type: ignore
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assert result[0]["content"][1]["file_id"] == "file-12345" # type: ignore
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def test_handle_file_message_without_file_id(self):
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"""Test that file messages without file_id are ignored."""
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@ -682,9 +683,7 @@ class TestMistralFileHandling:
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messages = [
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{
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"role": "user",
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"content": [
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{"type": "text", "text": "Please review this file."}
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]
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"content": [{"type": "text", "text": "Please review this file."}],
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}
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]
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casted_message = cast(list[AllMessageValues], messages)
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@ -703,8 +702,8 @@ class TestMistralFileHandling:
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"content": [
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{"type": "text", "text": "Please review these files."},
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{"type": "file", "file": {"file_id": "file-12345"}},
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{"type": "file", "file": {"file_id": "file-67890"}}
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]
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{"type": "file", "file": {"file_id": "file-67890"}},
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],
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}
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]
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casted_message = cast(list[AllMessageValues], messages)
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@ -720,3 +719,89 @@ class TestMistralFileHandling:
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# Check that file_ids are modified to match Mistral's expected format
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assert result[0]["content"][1]["file_id"] == "file-12345" # type: ignore
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assert result[0]["content"][2]["file_id"] == "file-67890" # type: ignore
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def test_handle_file_message_with_file_data_converts_to_document_url(self):
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"""Test that file_data (base64 URI) is translated to Mistral's document_url format."""
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mistral_config = MistralConfig()
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file_data = "data:application/pdf;base64,JVBERi0xLjQK"
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messages = [
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{
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"role": "user",
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"content": [
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{"type": "text", "text": "What does this PDF contain?"},
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{
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"type": "file",
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"file": {
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"filename": "test.pdf",
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"file_data": file_data,
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},
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},
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],
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}
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]
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casted_messages = cast(list[AllMessageValues], messages)
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result = mistral_config._handle_message_with_file(casted_messages)
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assert len(result) == 1
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content = result[0]["content"]
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assert isinstance(content, list)
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assert len(content) == 2
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assert content[0] == {"type": "text", "text": "What does this PDF contain?"}
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assert content[1]["type"] == "document_url" # type: ignore
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assert content[1]["document_url"] == file_data # type: ignore
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assert "file" not in content[1]
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def test_handle_file_message_file_data_takes_priority_over_file_id(self):
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"""Test that file_data is preferred over file_id when both are present."""
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mistral_config = MistralConfig()
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file_data = "data:application/pdf;base64,JVBERi0xLjQK"
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messages = [
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{
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"role": "user",
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"content": [
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{
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"type": "file",
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"file": {
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"file_id": "file-12345",
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"file_data": file_data,
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},
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}
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],
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}
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]
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casted_messages = cast(list[AllMessageValues], messages)
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result = mistral_config._handle_message_with_file(casted_messages)
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content = result[0]["content"]
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assert isinstance(content, list)
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assert content[0]["type"] == "document_url" # type: ignore
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assert content[0]["document_url"] == file_data # type: ignore
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def test_transform_messages_sync_translates_file_data_to_document_url(self):
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"""Test the full sync transform pipeline translates file_data end-to-end."""
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mistral_config = MistralConfig()
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file_data = "data:application/pdf;base64,JVBERi0xLjQK"
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messages = [
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{
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"role": "user",
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"content": [
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{"type": "text", "text": "Summarise this PDF."},
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{
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"type": "file",
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"file": {"filename": "doc.pdf", "file_data": file_data},
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},
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],
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}
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]
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casted_messages = cast(list[AllMessageValues], messages)
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result = mistral_config._transform_messages_sync(
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casted_messages, model="mistral-small-latest"
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)
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user_content = result[0]["content"]
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assert isinstance(user_content, list)
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file_block = next(
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(c for c in user_content if c.get("type") == "document_url"), None
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)
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assert file_block is not None
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assert file_block["document_url"] == file_data # type: ignore
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