Thomas SharedInboxandClaude Sonnet 4.6
653ef92430
Emails with multipart/related structure reference embedded images via cid: URIs. The WebView's CSP only allows data:/blob: sources, so those images were never shown. injectInlineImages() now replaces each cid: reference with a data: URI using the decoded bytes from the MIME tree, both for double-quoted and single-quoted src attributes. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
45 lines
1.5 KiB
Dart
45 lines
1.5 KiB
Dart
import 'dart:convert';
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import 'package:enough_mail/enough_mail.dart' as imap;
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/// Replaces `src="cid:..."` references in [html] with inline `data:` URIs
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/// by looking up each Content-ID in the MIME tree of [msg].
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///
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/// Emails with `multipart/related` often embed images this way. Without
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/// substitution the WebView shows broken image icons even after the full
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/// message has been downloaded.
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String injectInlineImages(String html, imap.MimeMessage msg) {
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final inlineParts = msg.findContentInfo(
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disposition: imap.ContentDisposition.inline,
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);
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if (inlineParts.isEmpty) return html;
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var result = html;
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for (final info in inlineParts) {
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final cid = info.cid;
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if (cid == null || cid.isEmpty) continue;
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final bareCid = cid.startsWith('<') && cid.endsWith('>')
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? cid.substring(1, cid.length - 1)
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: cid;
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final part = msg.getPart(info.fetchId);
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if (part == null) continue;
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final bytes = part.decodeContentBinary();
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if (bytes == null || bytes.isEmpty) continue;
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final contentType =
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info.contentType?.mediaType.text ?? 'application/octet-stream';
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final dataUri = 'data:$contentType;base64,${base64.encode(bytes)}';
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result = result
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.replaceAll('src="cid:$bareCid"', 'src="$dataUri"')
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.replaceAll("src='cid:$bareCid'", "src='$dataUri'")
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.replaceAll('src="cid:${bareCid.toLowerCase()}"', 'src="$dataUri"')
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.replaceAll(
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"src='cid:${bareCid.toLowerCase()}'",
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"src='$dataUri'",
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);
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}
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return result;
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}
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