feat(openai): add support for pdf files as media

Signed-off-by: Jan-Eric Harnack <janericharnack@googlemail.com>

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java

@@ -635,6 +635,10 @@ public class OpenAiChatModel implements ChatModel {
 			return new MediaContent(
 					new MediaContent.InputAudio(fromAudioData(media.getData()), MediaContent.InputAudio.Format.WAV));
 		}
+		if (MimeTypeUtils.parseMimeType("application/pdf").equals(mimeType)) {
+			return new MediaContent(new MediaContent.InputFile(media.getName(),
+					this.fromMediaData(media.getMimeType(), media.getData())));
+		}
 		else {
 			return new MediaContent(
 					new MediaContent.ImageUrl(this.fromMediaData(media.getMimeType(), media.getData())));

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/api/OpenAiApi.java

@@ -1367,14 +1367,15 @@ public class OpenAiApi {
 			@JsonProperty("type") String type,
 			@JsonProperty("text") String text,
 			@JsonProperty("image_url") ImageUrl imageUrl,
-			@JsonProperty("input_audio") InputAudio inputAudio) { // @formatter:on
+			@JsonProperty("input_audio") InputAudio inputAudio,
+			@JsonProperty("file") InputFile inputFile) { // @formatter:on
 
 			/**
 			 * Shortcut constructor for a text content.
 			 * @param text The text content of the message.
 			 */
 			public MediaContent(String text) {
-				this("text", text, null, null);
+				this("text", text, null, null, null);
 			}
 
 			/**
@@ -1382,7 +1383,7 @@ public class OpenAiApi {
 			 * @param imageUrl The image content of the message.
 			 */
 			public MediaContent(ImageUrl imageUrl) {
-				this("image_url", null, imageUrl, null);
+				this("image_url", null, imageUrl, null, null);
 			}
 
 			/**
@@ -1390,7 +1391,15 @@ public class OpenAiApi {
 			 * @param inputAudio The audio content of the message.
 			 */
 			public MediaContent(InputAudio inputAudio) {
-				this("input_audio", null, null, inputAudio);
+				this("input_audio", null, null, inputAudio, null);
+			}
+
+			/**
+			 * Shortcut constructor for a file content
+			 * @param inputFile The file content of the message.
+			 */
+			public MediaContent(InputFile inputFile) {
+				this("file", null, null, null, inputFile);
 			}
 
 			/**
@@ -1428,6 +1437,18 @@ public class OpenAiApi {
 
 			}
 
+			/**
+			 * Constructor for base64-encoded file
+			 *
+			 * @param filename name of the file
+			 * @param fileData file data with format
+			 * "data:{mimetype};base64,{base64-encoded-image-data}".
+			 */
+			public record InputFile(@JsonProperty("filename") String filename,
+					@JsonProperty("file_data") String fileData) {
+
+			}
+
 		}
 
 		/**

models/spring-ai-openai/src/test/java/org/springframework/ai/openai/chat/MessageTypeContentTests.java

@@ -18,6 +18,7 @@ package org.springframework.ai.openai.chat;
 
 import java.net.MalformedURLException;
 import java.net.URI;
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Map;
 
@@ -29,6 +30,8 @@ import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.core.io.ByteArrayResource;
+import org.springframework.util.MimeType;
 import reactor.core.publisher.Flux;
 
 import org.springframework.ai.chat.messages.SystemMessage;
@@ -126,11 +129,8 @@ public class MessageTypeContentTests {
 		given(this.openAiApi.chatCompletionEntity(this.pomptCaptor.capture(), this.headersCaptor.capture()))
 			.willReturn(Mockito.mock(ResponseEntity.class));
 
-		URI mediaUri = URI.create("http://test");
-		this.chatModel.call(new Prompt(List.of(UserMessage.builder()
-			.text("test message")
-			.media(List.of(Media.builder().mimeType(MimeTypeUtils.IMAGE_JPEG).data(mediaUri).build()))
-			.build())));
+		this.chatModel
+			.call(new Prompt(List.of(UserMessage.builder().text("test message").media(this.buildMediaList()).build())));
 
 		validateComplexContent(this.pomptCaptor.getValue());
 	}
@@ -141,11 +141,10 @@ public class MessageTypeContentTests {
 		given(this.openAiApi.chatCompletionStream(this.pomptCaptor.capture(), this.headersCaptor.capture()))
 			.willReturn(this.fluxResponse);
 
-		URI mediaUrl = URI.create("http://test");
-		this.chatModel.stream(new Prompt(List.of(UserMessage.builder()
-			.text("test message")
-			.media(List.of(Media.builder().mimeType(MimeTypeUtils.IMAGE_JPEG).data(mediaUrl).build()))
-			.build()))).subscribe();
+		this.chatModel
+			.stream(new Prompt(
+					List.of(UserMessage.builder().text("test message").media(this.buildMediaList()).build())))
+			.subscribe();
 
 		validateComplexContent(this.pomptCaptor.getValue());
 	}
@@ -161,16 +160,40 @@ public class MessageTypeContentTests {
 		@SuppressWarnings({ "unused", "unchecked" })
 		List<Map<String, Object>> mediaContents = (List<Map<String, Object>>) userMessage.rawContent();
 
-		assertThat(mediaContents).hasSize(2);
+		assertThat(mediaContents).hasSize(3);
 
+		// Assert text content
 		Map<String, Object> textContent = mediaContents.get(0);
 		assertThat(textContent.get("type")).isEqualTo("text");
 		assertThat(textContent.get("text")).isEqualTo("test message");
 
+		// Assert image content
 		Map<String, Object> imageContent = mediaContents.get(1);
 
 		assertThat(imageContent.get("type")).isEqualTo("image_url");
 		assertThat(imageContent).containsKey("image_url");
+
+		// Assert file content
+		Map<String, Object> fileContent = mediaContents.get(2);
+		assertThat(fileContent.get("type")).isEqualTo("file");
+		assertThat(fileContent).containsKey("file");
+		assertThat(fileContent.get("file")).isInstanceOf(Map.class);
+
+		Map<String, Object> fileMap = (Map<String, Object>) fileContent.get("file");
+		assertThat(fileMap.get("file_data")).isEqualTo("data:application/pdf;base64,JVBERi0xLjc=");
+	}
+
+	private List<Media> buildMediaList() {
+		URI imageUri = URI.create("http://test");
+		Media imageMedia = Media.builder().mimeType(MimeTypeUtils.IMAGE_JPEG).data(imageUri).build();
+
+		byte[] pdfData = "%PDF-1.7".getBytes(StandardCharsets.UTF_8);
+		Media pdfMedia = Media.builder()
+			.mimeType(MimeType.valueOf("application/pdf"))
+			.data(new ByteArrayResource(pdfData))
+			.build();
+
+		return List.of(imageMedia, pdfMedia);
 	}
 
 }