UTF-8 characters from marketo are improperly decoded

[abrittis]

Steps to reproduce

• Extract records from marketo that contain UTF-8 characters
• View results in an editor that supports UTF-8

Expected Results

• UTF-8 characters are displayed properly

Actual Results

• UTF-8 characters are corrupted

Proposed Solution

• IMO this is actually a bug with the Marketo API call https://.mktorest.com/bulk/v1//export/<job_id>/file.json
• The above call returns a response with the encoding set to ISO-8859-1, even if the response contains UTF-8 characters.
• This causes Python's requests.models.iter_content(decode_unicode=True) to use the incorrect decoder. (Since the response says the encoding is IOS-8859-1, python just ignores the decode_unicode parameter).
• My proposed fix would be to set the encoding to 'utf-8' in the response before we request python to iter_content. This change would be in tap-marketo.sync.py right after we make the call "resp = client.stream_export(stream_type, export_id)."

tap-marketo.sync.py

def stream_rows(client, stream_type, export_id):
    with tempfile.NamedTemporaryFile(mode="w+", encoding="utf8", delete=False) as csv_file:
        singer.log_info("Download starting.")
        resp = client.stream_export(stream_type, export_id)
        # Force response encoding to 'utf-8' since Marketo doesn't set this properly
        resp.encoding = 'utf-8'
        for chunk in resp.iter_content(chunk_size=CHUNK_SIZE_BYTES, decode_unicode=True):
        if chunk:
            # Replace CR
            chunk = chunk.replace('\r', '')
            csv_file.write(chunk)