chore(client-protocol): export some class & types

client-protocol/ChatAttachment.ts

@@ -0,0 +1,90 @@
+import { ApiCallbackMessage } from 'lingchair-internal-shared'
+import BaseClientObject from './BaseClientObject.ts'
+import CallbackError from './CallbackError.ts'
+import LingChairClient from './LingChairClient.ts'
+
+export default class ChatAttachment extends BaseClientObject {
+    declare file_hash: string
+    declare file_name: string
+    constructor(client: LingChairClient, {
+        file_hash,
+        file_name
+    }: {
+        file_hash: string,
+        file_name: string
+    }) {
+        super(client)
+        this.file_name = file_name
+        this.file_hash = file_hash
+    }
+    async blob() {
+        try {
+            return await this.blobOrThrow()
+        } catch (_) {
+            return null
+        }
+    }
+    fetch(init?: RequestInit) {
+        const url = this.client.getUrlForFileByHash(this.file_hash)
+        return fetch(url!, init)
+    }
+    async blobOrThrow() {
+        const re = await this.fetch()
+        const blob = await re.blob()
+        if (!re.ok) throw new CallbackError({
+            msg: await blob.text(),
+            code: re.status,
+        } as ApiCallbackMessage)
+        return blob
+    }
+    async getMimeType() {
+        try {
+            return await this.getMimeTypeOrThrow()
+        } catch (_) {
+            return null
+        }
+    }
+    async getMimeTypeOrThrow() {
+        const re = await this.fetch({
+            method: 'HEAD'
+        })
+        if (re.ok) {
+            const t = re.headers.get('content-type')
+            if (t)
+                return t
+            throw new Error("Unable to get Content-Type")
+        }
+        throw new CallbackError({
+            msg: await re.text(),
+            code: re.status,
+        } as ApiCallbackMessage)
+    }
+    async getLength() {
+        try {
+            return await this.getLengthOrThrow()
+        } catch (_) {
+            return null
+        }
+    }
+    async getLengthOrThrow() {
+        const re = await this.fetch({
+            method: 'HEAD'
+        })
+        if (re.ok) {
+            const contentLength = re.headers.get('content-length')
+            if (contentLength)
+                return parseInt(contentLength)
+            throw new Error("Unable to get Content-Length")
+        }
+        throw new CallbackError({
+            msg: await re.text(),
+            code: re.status,
+        } as ApiCallbackMessage)
+    }
+    getFileHash() {
+        return this.file_hash
+    }
+    getFileName() {
+        return this.file_name
+    }
+}