Greptile Overview

Greptile Summary

Added a mime_type parameter to the rx.download() function to allow customization of the MIME type for downloaded data. The implementation sets sensible defaults: text/plain for string data and application/octet-stream for binary data.

Key Changes

• Removed urllib.parse import (no longer needed)
• Added mime_type parameter to download() function signature
• Changed string data encoding from URL encoding to base64 encoding for consistency
• Applied mime_type to all three data type branches: str, Var, and bytes

Issues Found

• Critical bug on line 1288: F-string used with mime_type in a Var context won't work correctly if mime_type is also a Var - needs to use string concatenation instead
• The change from URL encoding to base64 for plain text strings is a behavioral change that could affect existing code expecting URL-encoded data URIs

Confidence Score: 2/5

• This PR has a critical bug that will cause runtime errors when mime_type is a Var
• Score of 2 due to a critical logic error on line 1288 where f-string interpolation won't work correctly with Var types. The mime_type needs to use dynamic string concatenation instead of f-strings. Additionally, the change from URL encoding to base64 for plain text is a breaking behavioral change that wasn't mentioned in the PR description.
• Pay close attention to reflex/event.py line 1288 - the f-string usage with mime_type will fail when mime_type is a Var

Important Files Changed

File Analysis

Sequence Diagram

sequenceDiagram
    participant User
    participant Frontend
    participant download
    participant Browser
    
    User->>download: "Call with data or url and optional mime_type"
    
    alt URL provided
        download->>download: "Validate URL starts with slash"
        download->>download: "Infer filename from URL if needed"
        download->>Frontend: "Return EventSpec with url and filename"
    else String data provided
        download->>download: "Set mime_type to text/plain if None"
        download->>download: "Base64 encode string data"
        download->>download: "Create data URI with mime_type and base64"
        download->>Frontend: "Return EventSpec with data URI"
    else Var data provided
        download->>download: "Set mime_type to text/plain if None"
        download->>download: "Check if Var is already data URI"
        download->>download: "Use cond to handle both cases"
        download->>Frontend: "Return EventSpec with conditional data URI"
    else bytes data provided
        download->>download: "Set mime_type to octet-stream if None"
        download->>download: "Base64 encode bytes"
        download->>download: "Create data URI with mime_type"
        download->>Frontend: "Return EventSpec with data URI"
    end
    
    Frontend->>Browser: "Trigger download with URL or data URI"
    Browser->>User: "Download file with specified filename"

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