base64-preview-prompt.txt

import re
import filetype
from datasette import hookimpl
from markupsafe import escape, Markup
sequence_re = re.compile(r"((?:\\x[0-9a-f]{2})+)")
octet_re = re.compile(r"(\\x[0-9a-f]{2})")
@hookimpl(trylast=True)
def render_cell(value):
    if not isinstance(value, bytes):
        return None
    # Attempt to guess filetype
    suggestion = None
    match = filetype.guess(value[:1000])
    if match:
        suggestion = "{} ({})".format(match.extension, match.mime)
    encoded = repr(value)
    # Ditch the b' and trailing '
    if encoded.startswith("b'") and encoded.endswith("'"):
        encoded = encoded[2:-1]
    # Split it into sequences of octets and characters
    chunks = sequence_re.split(encoded)
    html = []
    if suggestion:
        html.append(
            '<p style="margin-top: 0; font-family: monospace; font-size: 0.8em;">Suggestion: {}</p>'.format(
                escape(suggestion)
            )
        )
    for chunk in chunks:
        if sequence_re.match(chunk):
            octets = octet_re.findall(chunk)
            octets = [o[2:] for o in octets]
            html.append(
                '<code style="color: #999; font-family: monospace">{}</code>'.format(
                    " ".join(octets).upper()
                )
            )
        else:
            html.append(escape(chunk.replace("\\\\", "\\")))
    return Markup(" ".join(html).strip())

With that code as inspiration, modify the following Django Admin code to use that to display decoded base64 data:

@admin.register(RequestLog)
class RequestLogAdmin(admin.ModelAdmin):
    list_display = ("endpoint", "method", "timestamp", "body_preview", "is_base64")
    list_filter = ("endpoint", "method", "is_base64")
    readonly_fields = (
        "endpoint",
        "method",
        "headers",
        "body_display",
        "is_base64",
        "timestamp",
    )
    search_fields = ("endpoint__path",)

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def body_preview(self, obj):
        body = obj.get_body()
        if isinstance(body, bytes):
            return f"Binary data ({len(body)} bytes)"
        return body[:50] + ("..." if len(body) > 50 else "")

    def body_display(self, obj):
        body = obj.get_body()
        if isinstance(body, bytes):
            return format_html("<pre>Binary data ({} bytes)</pre>", len(body))
        return format_html("<pre>{}</pre>", body)

    body_display.short_description = "Body"