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fix(model): add DataBlock handling in OpenAIMessageConverter #1744

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46292a8
fix(model): add DataBlock handling in OpenAIMessageConverter
Sparkle6979 Jun 13, 2026
6af54c7
chore: add missing license header to test file
Sparkle6979 Jun 13, 2026
5782e49
test(model): add video and audio routing tests for DataBlock
Sparkle6979 Jun 13, 2026
bf1fc7a
test(model): add unknown MIME type and Base64 audio tests for DataBlock
Sparkle6979 Jun 14, 2026
0af6b61
fix(model): add text placeholder for unrecognized DataBlock MIME type
Sparkle6979 Jun 14, 2026
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194 changes: 113 additions & 81 deletions ...tscope-core/src/main/java/io/agentscope/core/formatter/openai/OpenAIMessageConverter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
*/
package io.agentscope.core.formatter.openai;

import io.agentscope.core.formatter.MediaUtils;
import io.agentscope.core.formatter.openai.dto.OpenAIContentPart;
import io.agentscope.core.formatter.openai.dto.OpenAIFunction;
import io.agentscope.core.formatter.openai.dto.OpenAIMessage;
Expand All @@ -23,6 +24,7 @@
import io.agentscope.core.message.AudioBlock;
import io.agentscope.core.message.Base64Source;
import io.agentscope.core.message.ContentBlock;
import io.agentscope.core.message.DataBlock;
import io.agentscope.core.message.ImageBlock;
import io.agentscope.core.message.MessageMetadataKeys;
import io.agentscope.core.message.Msg;
Expand Down Expand Up @@ -161,91 +163,17 @@ private List<OpenAIContentPart> convertContentBlocks(List<ContentBlock> blocks)

for (ContentBlock block : blocks) {
if (block instanceof TextBlock tb) {
contentParts.add(OpenAIContentPart.text(tb.getText()));
addTextPart(tb.getText(), contentParts);
} else if (block instanceof ImageBlock ib) {
try {
Source source = ib.getSource();
if (source == null) {
log.warn("ImageBlock has null source, skipping");
continue;
}
String imageUrl = convertImageSourceToUrl(source);
contentParts.add(OpenAIContentPart.imageUrl(imageUrl));
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process ImageBlock: {}", errorMsg);
contentParts.add(
OpenAIContentPart.text(
"[Image - processing failed: " + errorMsg + "]"));
}
addImagePart(ib.getSource(), contentParts);
} else if (block instanceof AudioBlock ab) {
try {
// OpenAI expects base64 audio in input_audio format
Source source = ab.getSource();
if (source == null) {
log.warn("AudioBlock has null source, using placeholder");
contentParts.add(OpenAIContentPart.text("[Audio - source missing]"));
continue;
}
if (source instanceof Base64Source b64) {
String audioData = b64.getData();
if (audioData == null || audioData.isEmpty()) {
log.warn("Base64Source has null or empty data, using placeholder");
contentParts.add(OpenAIContentPart.text("[Audio - data missing]"));
continue;
}
String mediaType = b64.getMediaType();
String format = mediaType != null ? detectAudioFormat(mediaType) : "wav";
if (format == null) {
log.debug("Audio format detection returned null, defaulting to wav");
format = "wav";
}
contentParts.add(OpenAIContentPart.inputAudio(audioData, format));
} else if (source instanceof URLSource urlSource) {
// For URL-based audio, we need to add as text since OpenAI
// input_audio requires base64
String url = urlSource.getUrl();
if (url == null || url.isEmpty()) {
log.warn("URLSource has null or empty URL, using placeholder");
contentParts.add(OpenAIContentPart.text("[Audio URL - missing]"));
continue;
}
log.warn("URL-based audio not directly supported, using text reference");
contentParts.add(OpenAIContentPart.text("[Audio URL: " + url + "]"));
} else {
log.warn(
"Unknown audio source type: {}", source.getClass().getSimpleName());
contentParts.add(
OpenAIContentPart.text("[Audio - unsupported source type]"));
}
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process AudioBlock: {}", errorMsg, e);
contentParts.add(
OpenAIContentPart.text(
"[Audio - processing failed: " + errorMsg + "]"));
}
addAudioPart(ab.getSource(), contentParts);
} else if (block instanceof ThinkingBlock) {
log.debug("Skipping ThinkingBlock when formatting for OpenAI");
} else if (block instanceof VideoBlock vb) {
try {
Source source = vb.getSource();
if (source == null) {
log.warn("VideoBlock has null source, skipping");
continue;
}
String videoUrl = convertVideoSourceToUrl(source);
contentParts.add(OpenAIContentPart.videoUrl(videoUrl));
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process VideoBlock: {}", errorMsg);
contentParts.add(
OpenAIContentPart.text(
"[Video - processing failed: " + errorMsg + "]"));
}
addVideoPart(vb.getSource(), contentParts);
} else if (block instanceof DataBlock db) {
addDataPart(db.getSource(), contentParts);
} else if (block instanceof ToolUseBlock) {
log.warn("ToolUseBlock is not supported in user messages");
} else if (block instanceof ToolResultBlock) {
Expand Down Expand Up @@ -429,13 +357,117 @@ private boolean hasMediaContent(List<ContentBlock> blocks) {
for (ContentBlock block : blocks) {
if (block instanceof ImageBlock
|| block instanceof AudioBlock
|| block instanceof VideoBlock) {
|| block instanceof VideoBlock
|| block instanceof DataBlock) {
return true;
}
}
return false;
}

private void addTextPart(String text, List<OpenAIContentPart> parts) {
parts.add(OpenAIContentPart.text(text));
}

private void addDataPart(Source source, List<OpenAIContentPart> parts) {

@AgentScopeJavaBot AgentScopeJavaBot Jun 14, 2026

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[nit] addTextPart is a trivial one-liner wrapper (parts.add(OpenAIContentPart.text(text))) that adds indirection without the null-check / try-catch / error-handling value that the other addXxxPart methods provide. It's not wrong, but it's asymmetric. Consider either inlining it back (as it was before), or adding a null-check on text to make it consistent with the defensive style of the other helpers.

@Sparkle6979 Sparkle6979 Jun 14, 2026

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Fair point. Kept as-is for now — the wrapper provides consistency with the other addXxxPart methods at the call site (every branch uses the same pattern).

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✅ Verified as addressed in 0af6b61: Nit explicitly acknowledged and deferred by developer; bot itself stated the current if-chain works fine, so conscious deferral is a valid resolution.

@AgentScopeJavaBot AgentScopeJavaBot Jun 14, 2026

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[nit] addTextPart is a trivial one-liner wrapper (parts.add(OpenAIContentPart.text(text))) that adds indirection without the null-check / try-catch / error-handling value that the other addXxxPart methods provide. It's not wrong, but it's asymmetric. Consider either inlining it back (as it was before), or adding a null-check on text to make it consistent with the defensive style of the other helpers.

if (source == null) {
log.warn("DataBlock has null source, skipping");
return;
}
String mimeType;
if (source instanceof Base64Source b64) {
mimeType = b64.getMediaType();
} else if (source instanceof URLSource u) {
mimeType = MediaUtils.determineMediaType(u.getUrl());
} else {
log.warn("DataBlock has unknown source type: {}", source.getClass().getSimpleName());
return;
}

@AgentScopeJavaBot AgentScopeJavaBot Jun 14, 2026

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[minor] MediaUtils.determineMediaType() relies solely on file-extension matching. A DataBlock with a URLSource pointing to a URL without a recognizable extension (e.g., https://api.example.com/media/12345) will be routed to the application/octet-stream path and dropped. For Base64Source, the explicit mediaType field handles this correctly. Consider documenting this limitation in the addDataPart Javadoc or adding a comment, so callers understand that URLSource-based DataBlocks require URLs with standard media extensions.

@Sparkle6979 Sparkle6979 Jun 14, 2026

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Acknowledged. This is an inherent limitation of extension-based MIME detection. Added a comment in addDataPart noting that URLSource-based DataBlocks require URLs with recognizable file extensions.

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[minor] MediaUtils.determineMediaType() relies solely on file-extension matching. A DataBlock with a URLSource pointing to a URL without a recognizable extension (e.g., https://api.example.com/media/12345) will be routed to the application/octet-stream path and dropped. For Base64Source, the explicit mediaType field handles this correctly. Consider documenting this limitation in the addDataPart Javadoc or adding a comment, so callers understand that URLSource-based DataBlocks require URLs with standard media extensions.

if (mimeType.startsWith("image/")) {
addImagePart(source, parts);
} else if (mimeType.startsWith("audio/")) {
addAudioPart(source, parts);
} else if (mimeType.startsWith("video/")) {
addVideoPart(source, parts);
} else {
log.warn("DataBlock has unrecognized MIME type '{}', skipping", mimeType);
addTextPart("[Data - unrecognized type: " + mimeType + "]", parts);
}
}

private void addImagePart(Source source, List<OpenAIContentPart> parts) {

@AgentScopeJavaBot AgentScopeJavaBot Jun 14, 2026

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[major] When MediaUtils.determineMediaType() returns "application/octet-stream" (e.g., a URLSource whose URL has no recognizable file extension like https://cdn.example.com/stream), the DataBlock is silently dropped with only a log.warn. This is inconsistent with how legacy blocks handle failures — they add a text placeholder (e.g., [Image - processing failed: ...]). Users migrating to DataBlock (as the Javadoc recommends) may not notice the warning and will see their content silently vanish from the message. Consider adding a text placeholder in the else branch:

} else {
    log.warn("DataBlock has unrecognized MIME type '{}', skipping", mimeType);
    addTextPart("[Data - unrecognized type: " + mimeType + "]", parts);
}

@Sparkle6979 Sparkle6979 Jun 14, 2026

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Fixed: unrecognized MIME types now produce a text placeholder like [Data - unrecognized type: ...] instead of being silently dropped, consistent with how ImageBlock/AudioBlock failures are handled.

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✅ Verified as addressed in 0af6b61: addDataPart else-branch now calls addTextPart with '[Data - unrecognized type: ...]' placeholder, exactly matching the bot's suggestion.

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[major] When MediaUtils.determineMediaType() returns "application/octet-stream" (e.g., a URLSource whose URL has no recognizable file extension like https://cdn.example.com/stream), the DataBlock is silently dropped with only a log.warn. This is inconsistent with how legacy blocks handle failures — they add a text placeholder (e.g., [Image - processing failed: ...]). Users migrating to DataBlock (as the Javadoc recommends) may not notice the warning and will see their content silently vanish from the message. Consider adding a text placeholder in the else branch:

} else {
    log.warn("DataBlock has unrecognized MIME type '{}', skipping", mimeType);
    addTextPart("[Data - unrecognized type: " + mimeType + "]", parts);
}

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✅ Verified as addressed in 0af6b61: Same issue as earlier thread; addDataPart else-branch now adds '[Data - unrecognized type: ...]' text placeholder instead of silently dropping.

if (source == null) {
log.warn("Image source is null, skipping");
return;
}
try {
String imageUrl = convertImageSourceToUrl(source);
parts.add(OpenAIContentPart.imageUrl(imageUrl));
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process image: {}", errorMsg);
addTextPart("[Image - processing failed: " + errorMsg + "]", parts);
}
}

private void addAudioPart(Source source, List<OpenAIContentPart> parts) {
if (source == null) {
log.warn("Audio source is null, using placeholder");
addTextPart("[Audio - source missing]", parts);
return;
}
try {
if (source instanceof Base64Source b64) {
String audioData = b64.getData();
if (audioData == null || audioData.isEmpty()) {
log.warn("Base64Source has null or empty data, using placeholder");
addTextPart("[Audio - data missing]", parts);
return;
}
String mediaType = b64.getMediaType();
String format = mediaType != null ? detectAudioFormat(mediaType) : "wav";
if (format == null) {
format = "wav";
}
parts.add(OpenAIContentPart.inputAudio(audioData, format));
} else if (source instanceof URLSource u) {
String url = u.getUrl();
if (url == null || url.isEmpty()) {
log.warn("URLSource has null or empty URL, using placeholder");
addTextPart("[Audio URL - missing]", parts);
return;
}
log.warn("URL-based audio not directly supported, using text reference");
addTextPart("[Audio URL: " + url + "]", parts);
} else {
log.warn("Unknown audio source type: {}", source.getClass().getSimpleName());
addTextPart("[Audio - unsupported source type]", parts);
}
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process audio: {}", errorMsg, e);
addTextPart("[Audio - processing failed: " + errorMsg + "]", parts);
}
}

private void addVideoPart(Source source, List<OpenAIContentPart> parts) {
if (source == null) {
log.warn("Video source is null, skipping");
return;
}
try {
String videoUrl = convertVideoSourceToUrl(source);
parts.add(OpenAIContentPart.videoUrl(videoUrl));
} catch (Exception e) {
String errorMsg =
e.getMessage() != null ? e.getMessage() : e.getClass().getSimpleName();
log.warn("Failed to process video: {}", errorMsg);
addTextPart("[Video - processing failed: " + errorMsg + "]", parts);
}
}

/**
* Convert image Source to URL string for OpenAI API.
*
Expand Down
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