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import { customAlphabet } from "nanoid";
import {
CoreMessage,
CoreToolMessage,
ToolInvocation,
Message,
FilePart,
ImagePart,
Attachment,
DataContent,
} from "ai";
export const nanoid = customAlphabet(
"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
);
export const randomId = () => nanoid(10);
function addToolMessageToChat({
toolMessage,
messages,
}: {
toolMessage: CoreToolMessage;
messages: Array<Message>;
}): Array<Message> {
return messages.map((message) => {
if (message.toolInvocations) {
return {
...message,
toolInvocations: message.toolInvocations.map((toolInvocation) => {
const toolResult = toolMessage.content.find(
(tool) => tool.toolCallId === toolInvocation.toolCallId
);
if (toolResult) {
return {
...toolInvocation,
state: "result",
result: toolResult.result,
};
}
return toolInvocation;
}),
};
}
return message;
});
}
export const coreMessageAttachmentTypes = (
message: CoreMessage
): Array<"file" | "image"> => {
if (typeof message.content === "string") {
return [];
}
const attachmentTypes = message.content
.filter(
(content): content is FilePart | ImagePart =>
content.type === "file" || content.type === "image"
)
.map((content) => content.type);
return attachmentTypes;
};
type GenericPart<T extends "file" | "image"> = T extends "file"
? FilePart
: ImagePart;
export const getCoreMessageAttachments = (
message: CoreMessage
): Array<Attachment> => {
const attachmentTypes = coreMessageAttachmentTypes(message);
if (attachmentTypes.length === 0) {
return [];
}
if (typeof message.content === "string") {
return [];
}
const attachments: Array<Attachment> = [];
for (let i = 0; i < attachmentTypes.length; i++) {
const attachmentType = attachmentTypes[i];
const messageParts = message.content;
const parts = messageParts.filter(
(part) => part.type === attachmentType
) as Array<GenericPart<typeof attachmentType>>;
let data: string | Uint8Array | ArrayBuffer | URL;
if (attachmentType === "file") {
data = (parts[0] as FilePart).data;
} else {
data = (parts[0] as ImagePart).image;
}
const normalisedData = typeof data === "string" ? data : data.toString();
const size = normalisedData.length;
attachments.push({
name: size.toString(),
url: normalisedData,
contentType: parts[0].mimeType ?? "image/jpeg",
});
}
return attachments;
};
export function convertToUIMessages(
messages: Array<CoreMessage>
): Array<Message> {
return messages.reduce((chatMessages: Array<Message>, message) => {
if (message.role === "tool") {
return addToolMessageToChat({
toolMessage: message as CoreToolMessage,
messages: chatMessages,
}) satisfies Message[];
}
let textContent = "";
let toolInvocations: Array<ToolInvocation> = [];
if (typeof message.content === "string") {
textContent = message.content.trim();
} else if (Array.isArray(message.content)) {
for (const content of message.content) {
if (content.type === "text") {
textContent += content.text.trim();
} else if (content.type === "tool-call") {
toolInvocations.push({
state: "call",
toolCallId: content.toolCallId,
toolName: content.toolName,
args: content.args,
});
}
}
}
// Only add message if it has content or tool invocations
if (textContent || toolInvocations.length > 0) {
chatMessages.push({
id: (message.content.length * 100).toString(),
role: message.role,
content: textContent.replace(/<context>([\s\S]*?)<\/context>/, ""),
toolInvocations,
experimental_attachments: getCoreMessageAttachments(message),
annotations: textContent.includes("<context>")
? JSON.parse(
textContent.match(/<context>([\s\S]*?)<\/context>/)?.[1] ?? ""
)
: undefined,
});
}
return chatMessages;
}, []);
}
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