diff --git a/src/misc/create-temp.ts b/src/misc/create-temp.ts
new file mode 100644
index 000000000..04604cf7d
--- /dev/null
+++ b/src/misc/create-temp.ts
@@ -0,0 +1,10 @@
+import * as tmp from 'tmp';
+
+export function createTemp(): Promise<[string, any]> {
+	return new Promise<[string, any]>((res, rej) => {
+		tmp.file((e, path, fd, cleanup) => {
+			if (e) return rej(e);
+			res([path, cleanup]);
+		});
+	});
+}
diff --git a/src/misc/detect-mine.ts b/src/misc/detect-mine.ts
new file mode 100644
index 000000000..bbf49efc1
--- /dev/null
+++ b/src/misc/detect-mine.ts
@@ -0,0 +1,31 @@
+import * as fs from 'fs';
+import fileType from 'file-type';
+import checkSvg from '../misc/check-svg';
+
+export async function detectMine(path: string) {
+	return new Promise<[string, string]>((res, rej) => {
+		const readable = fs.createReadStream(path);
+		readable
+			.on('error', rej)
+			.once('data', (buffer: Buffer) => {
+				readable.destroy();
+				const type = fileType(buffer);
+				if (type) {
+					if (type.mime == 'application/xml' && checkSvg(path)) {
+						res(['image/svg+xml', 'svg']);
+					} else {
+						res([type.mime, type.ext]);
+					}
+				} else if (checkSvg(path)) {
+					res(['image/svg+xml', 'svg']);
+				} else {
+					// 種類が同定できなかったら application/octet-stream にする
+					res(['application/octet-stream', null]);
+				}
+			})
+			.on('end', () => {
+				// maybe 0 bytes
+				res(['application/octet-stream', null]);
+			});
+	});
+}
diff --git a/src/misc/detect-url-mine.ts b/src/misc/detect-url-mine.ts
new file mode 100644
index 000000000..eef64cfc5
--- /dev/null
+++ b/src/misc/detect-url-mine.ts
@@ -0,0 +1,15 @@
+import { createTemp } from './create-temp';
+import { downloadUrl } from './donwload-url';
+import { detectMine } from './detect-mine';
+
+export async function detectUrlMine(url: string) {
+	const [path, cleanup] = await createTemp();
+
+	try {
+		await downloadUrl(url, path);
+		const [type] = await detectMine(path);
+		return type;
+	} finally {
+		cleanup();
+	}
+}
diff --git a/src/misc/donwload-url.ts b/src/misc/donwload-url.ts
new file mode 100644
index 000000000..0dd4e4ef5
--- /dev/null
+++ b/src/misc/donwload-url.ts
@@ -0,0 +1,61 @@
+import * as fs from 'fs';
+import * as URL from 'url';
+import * as request from 'request';
+import config from '../config';
+import chalk from 'chalk';
+import Logger from '../services/logger';
+
+export async function downloadUrl(url: string, path: string) {
+	const logger = new Logger('download-url');
+
+	await new Promise((res, rej) => {
+		logger.info(`Downloading ${chalk.cyan(url)} ...`);
+
+		const writable = fs.createWriteStream(path);
+
+		writable.on('finish', () => {
+			logger.succ(`Download finished: ${chalk.cyan(url)}`);
+			res();
+		});
+
+		writable.on('error', error => {
+			logger.error(`Download failed: ${chalk.cyan(url)}: ${error}`, {
+				url: url,
+				e: error
+			});
+			rej(error);
+		});
+
+		const requestUrl = URL.parse(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
+
+		const req = request({
+			url: requestUrl,
+			proxy: config.proxy,
+			timeout: 10 * 1000,
+			headers: {
+				'User-Agent': config.userAgent
+			}
+		});
+
+		req.pipe(writable);
+
+		req.on('response', response => {
+			if (response.statusCode !== 200) {
+				logger.error(`Got ${response.statusCode} (${url})`);
+				writable.close();
+				rej(response.statusCode);
+			}
+		});
+
+		req.on('error', error => {
+			logger.error(`Failed to start download: ${chalk.cyan(url)}: ${error}`, {
+				url: url,
+				e: error
+			});
+			writable.close();
+			rej(error);
+		});
+
+		logger.succ(`Downloaded to: ${path}`);
+	});
+}
diff --git a/src/misc/download-text-file.ts b/src/misc/download-text-file.ts
index 60c9d83da..f73286e9b 100644
--- a/src/misc/download-text-file.ts
+++ b/src/misc/download-text-file.ts
@@ -1,79 +1,25 @@
-import * as tmp from 'tmp';
 import * as fs from 'fs';
 import * as util from 'util';
-import chalk from 'chalk';
-import * as request from 'request';
 import Logger from '../services/logger';
-import config from '../config';
+import { createTemp } from './create-temp';
+import { downloadUrl } from './donwload-url';
 
 const logger = new Logger('download-text-file');
 
 export async function downloadTextFile(url: string): Promise<string> {
 	// Create temp file
-	const [path, cleanup] = await new Promise<[string, any]>((res, rej) => {
-		tmp.file((e, path, fd, cleanup) => {
-			if (e) return rej(e);
-			res([path, cleanup]);
-		});
-	});
+	const [path, cleanup] = await createTemp();
 
 	logger.info(`Temp file is ${path}`);
 
-	// write content at URL to temp file
-	await new Promise((res, rej) => {
-		logger.info(`Downloading ${chalk.cyan(url)} ...`);
+	try {
+		// write content at URL to temp file
+		await downloadUrl(url, path);
 
-		const writable = fs.createWriteStream(path);
+		const text = await util.promisify(fs.readFile)(path, 'utf8');
 
-		writable.on('finish', () => {
-			logger.succ(`Download finished: ${chalk.cyan(url)}`);
-			res();
-		});
-
-		writable.on('error', error => {
-			logger.error(`Download failed: ${chalk.cyan(url)}: ${error}`, {
-				url: url,
-				e: error
-			});
-			rej(error);
-		});
-
-		const requestUrl = new URL(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
-
-		const req = request({
-			url: requestUrl,
-			proxy: config.proxy,
-			timeout: 10 * 1000,
-			headers: {
-				'User-Agent': config.userAgent
-			}
-		});
-
-		req.pipe(writable);
-
-		req.on('response', response => {
-			if (response.statusCode !== 200) {
-				logger.error(`Got ${response.statusCode} (${url})`);
-				writable.close();
-				rej(response.statusCode);
-			}
-		});
-
-		req.on('error', error => {
-			logger.error(`Failed to start download: ${chalk.cyan(url)}: ${error}`, {
-				url: url,
-				e: error
-			});
-			writable.close();
-			rej(error);
-		});
-	});
-
-	logger.succ(`Downloaded to: ${path}`);
-
-	const text = await util.promisify(fs.readFile)(path, 'utf8');
-
-	cleanup();
-
-	return text;
+		return text;
+	} finally {
+		cleanup();
+	}
 }
diff --git a/src/models/emoji.ts b/src/models/emoji.ts
index 373d5f860..cbf939222 100644
--- a/src/models/emoji.ts
+++ b/src/models/emoji.ts
@@ -17,4 +17,5 @@ export type IEmoji = {
 	updatedAt?: Date;
 	/** AP object id */
 	uri?: string;
+	type?: string;
 };
diff --git a/src/remote/activitypub/renderer/emoji.ts b/src/remote/activitypub/renderer/emoji.ts
index b18337d27..1a05b4e89 100644
--- a/src/remote/activitypub/renderer/emoji.ts
+++ b/src/remote/activitypub/renderer/emoji.ts
@@ -8,7 +8,7 @@ export default (emoji: IEmoji) => ({
 	updated: emoji.updatedAt != null ? emoji.updatedAt.toISOString() : new Date().toISOString,
 	icon: {
 		type: 'Image',
-		mediaType: 'image/png',	//Mei-TODO
+		mediaType: emoji.type || 'image/png',
 		url: emoji.url
 	}
 });
diff --git a/src/server/api/endpoints/admin/emoji/add.ts b/src/server/api/endpoints/admin/emoji/add.ts
index 99439f89a..c126c8380 100644
--- a/src/server/api/endpoints/admin/emoji/add.ts
+++ b/src/server/api/endpoints/admin/emoji/add.ts
@@ -1,6 +1,7 @@
 import $ from 'cafy';
 import Emoji from '../../../../../models/emoji';
 import define from '../../../define';
+import { detectUrlMine } from '../../../../../misc/detect-url-mine';
 
 export const meta = {
 	desc: {
@@ -29,12 +30,15 @@ export const meta = {
 };
 
 export default define(meta, async (ps) => {
+	const type = await detectUrlMine(ps.url);
+
 	const emoji = await Emoji.insert({
 		updatedAt: new Date(),
 		name: ps.name,
 		host: null,
 		aliases: ps.aliases,
-		url: ps.url
+		url: ps.url,
+		type,
 	});
 
 	return {
diff --git a/src/server/api/endpoints/admin/emoji/update.ts b/src/server/api/endpoints/admin/emoji/update.ts
index 38d90c65a..8b1c07be9 100644
--- a/src/server/api/endpoints/admin/emoji/update.ts
+++ b/src/server/api/endpoints/admin/emoji/update.ts
@@ -2,6 +2,7 @@ import $ from 'cafy';
 import Emoji from '../../../../../models/emoji';
 import define from '../../../define';
 import ID from '../../../../../misc/cafy-id';
+import { detectUrlMine } from '../../../../../misc/detect-url-mine';
 
 export const meta = {
 	desc: {
@@ -39,12 +40,15 @@ export default define(meta, async (ps) => {
 
 	if (emoji == null) throw new Error('emoji not found');
 
+	const type = await detectUrlMine(ps.url);
+
 	await Emoji.update({ _id: emoji._id }, {
 		$set: {
 			updatedAt: new Date(),
 			name: ps.name,
 			aliases: ps.aliases,
-			url: ps.url
+			url: ps.url,
+			type,
 		}
 	});
 
diff --git a/src/server/proxy/proxy-media.ts b/src/server/proxy/proxy-media.ts
index 2eec2012f..357715bb9 100644
--- a/src/server/proxy/proxy-media.ts
+++ b/src/server/proxy/proxy-media.ts
@@ -1,27 +1,19 @@
 import * as fs from 'fs';
-import * as URL from 'url';
-import * as tmp from 'tmp';
 import * as Koa from 'koa';
-import * as request from 'request';
-import fileType from 'file-type';
 import { serverLogger } from '..';
-import config from '../../config';
 import { IImage, ConvertToPng, ConvertToJpeg } from '../../services/drive/image-processor';
-import checkSvg from '../../misc/check-svg';
+import { createTemp } from '../../misc/create-temp';
+import { downloadUrl } from '../../misc/donwload-url';
+import { detectMine } from '../../misc/detect-mine';
 
 export async function proxyMedia(ctx: Koa.BaseContext) {
 	const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
 
 	// Create temp file
-	const [path, cleanup] = await new Promise<[string, any]>((res, rej) => {
-		tmp.file((e, path, fd, cleanup) => {
-			if (e) return rej(e);
-			res([path, cleanup]);
-		});
-	});
+	const [path, cleanup] = await createTemp();
 
 	try {
-		await fetch(url, path);
+		await downloadUrl(url, path);
 
 		const [type, ext] = await detectMine(path);
 
@@ -54,70 +46,3 @@ export async function proxyMedia(ctx: Koa.BaseContext) {
 		cleanup();
 	}
 }
-
-async function fetch(url: string, path: string) {
-	await new Promise((res, rej) => {
-		const writable = fs.createWriteStream(path);
-
-		writable.on('finish', () => {
-			res();
-		});
-
-		writable.on('error', error => {
-			rej(error);
-		});
-
-		const requestUrl = URL.parse(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
-
-		const req = request({
-			url: requestUrl,
-			proxy: config.proxy,
-			timeout: 10 * 1000,
-			headers: {
-				'User-Agent': config.userAgent
-			}
-		});
-
-		req.pipe(writable);
-
-		req.on('response', response => {
-			if (response.statusCode !== 200) {
-				writable.close();
-				rej(response.statusCode);
-			}
-		});
-
-		req.on('error', error => {
-			writable.close();
-			rej(error);
-		});
-	});
-}
-
-async function detectMine(path: string) {
-	return new Promise<[string, string]>((res, rej) => {
-		const readable = fs.createReadStream(path);
-		readable
-			.on('error', rej)
-			.once('data', (buffer: Buffer) => {
-				readable.destroy();
-				const type = fileType(buffer);
-				if (type) {
-					if (type.mime == 'application/xml' && checkSvg(path)) {
-						res(['image/svg+xml', 'svg']);
-					} else {
-						res([type.mime, type.ext]);
-					}
-				} else if (checkSvg(path)) {
-					res(['image/svg+xml', 'svg']);
-				} else {
-					// 種類が同定できなかったら application/octet-stream にする
-					res(['application/octet-stream', null]);
-				}
-			})
-			.on('end', () => {
-				// maybe 0 bytes
-				res(['application/octet-stream', null]);
-			});
-	});
-}
diff --git a/src/services/drive/add-file.ts b/src/services/drive/add-file.ts
index 5be71bc0a..cdbcb34de 100644
--- a/src/services/drive/add-file.ts
+++ b/src/services/drive/add-file.ts
@@ -6,7 +6,6 @@ import * as crypto from 'crypto';
 import * as Minio from 'minio';
 import * as uuid from 'uuid';
 import * as sharp from 'sharp';
-import fileType from 'file-type';
 
 import DriveFile, { IMetadata, getDriveFileBucket, IDriveFile } from '../../models/drive-file';
 import DriveFolder from '../../models/drive-folder';
@@ -25,8 +24,8 @@ import { GenerateVideoThumbnail } from './generate-video-thumbnail';
 import { driveLogger } from './logger';
 import { IImage, ConvertToJpeg, ConvertToWebp, ConvertToPng } from './image-processor';
 import Instance from '../../models/instance';
-import checkSvg from '../../misc/check-svg';
 import { contentDisposition } from '../../misc/content-disposition';
+import { detectMine } from '../../misc/detect-mine';
 
 const logger = driveLogger.createSubLogger('register', 'yellow');
 
@@ -306,33 +305,6 @@ export default async function(
 			});
 	});
 
-	// Detect content type
-	const detectMime = new Promise<[string, string]>((res, rej) => {
-		const readable = fs.createReadStream(path);
-		readable
-			.on('error', rej)
-			.once('data', (buffer: Buffer) => {
-				readable.destroy();
-				const type = fileType(buffer);
-				if (type) {
-					if (type.mime == 'application/xml' && checkSvg(path)) {
-						res(['image/svg+xml', 'svg']);
-					} else {
-						res([type.mime, type.ext]);
-					}
-				} else if (checkSvg(path)) {
-					res(['image/svg+xml', 'svg']);
-				} else {
-					// 種類が同定できなかったら application/octet-stream にする
-					res(['application/octet-stream', null]);
-				}
-			})
-			.on('end', () => {
-				// maybe 0 bytes
-				res(['application/octet-stream', null]);
-			});
-	});
-
 	// Get file size
 	const getFileSize = new Promise<number>((res, rej) => {
 		fs.stat(path, (err, stats) => {
@@ -341,7 +313,7 @@ export default async function(
 		});
 	});
 
-	const [hash, [mime, ext], size] = await Promise.all([calcHash, detectMime, getFileSize]);
+	const [hash, [mime, ext], size] = await Promise.all([calcHash, detectMine(path), getFileSize]);
 
 	logger.info(`hash: ${hash}, mime: ${mime}, ext: ${ext}, size: ${size}`);
 
diff --git a/src/services/drive/upload-from-url.ts b/src/services/drive/upload-from-url.ts
index 89efe8a50..cdf6ba0ce 100644
--- a/src/services/drive/upload-from-url.ts
+++ b/src/services/drive/upload-from-url.ts
@@ -1,15 +1,12 @@
-import * as fs from 'fs';
 import * as URL from 'url';
-import * as tmp from 'tmp';
-import * as request from 'request';
 
 import { IDriveFile, validateFileName } from '../../models/drive-file';
 import create from './add-file';
-import config from '../../config';
 import { IUser } from '../../models/user';
 import * as mongodb from 'mongodb';
 import { driveLogger } from './logger';
-import chalk from 'chalk';
+import { createTemp } from '../../misc/create-temp';
+import { downloadUrl } from '../../misc/donwload-url';
 
 const logger = driveLogger.createSubLogger('downloader');
 
@@ -28,62 +25,10 @@ export default async (
 	}
 
 	// Create temp file
-	const [path, cleanup] = await new Promise<[string, any]>((res, rej) => {
-		tmp.file((e, path, fd, cleanup) => {
-			if (e) return rej(e);
-			res([path, cleanup]);
-		});
-	});
+	const [path, cleanup] = await createTemp();
 
 	// write content at URL to temp file
-	await new Promise((res, rej) => {
-		logger.info(`Downloading ${chalk.cyan(url)} ...`);
-
-		const writable = fs.createWriteStream(path);
-
-		writable.on('finish', () => {
-			logger.succ(`Download finished: ${chalk.cyan(url)}`);
-			res();
-		});
-
-		writable.on('error', error => {
-			logger.error(`Download failed: ${chalk.cyan(url)}: ${error}`, {
-				url: url,
-				e: error
-			});
-			rej(error);
-		});
-
-		const requestUrl = URL.parse(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
-
-		const req = request({
-			url: requestUrl,
-			proxy: config.proxy,
-			timeout: 10 * 1000,
-			headers: {
-				'User-Agent': config.userAgent
-			}
-		});
-
-		req.pipe(writable);
-
-		req.on('response', response => {
-			if (response.statusCode !== 200) {
-				logger.error(`Got ${response.statusCode} (${url})`);
-				writable.close();
-				rej(response.statusCode);
-			}
-		});
-
-		req.on('error', error => {
-			logger.error(`Failed to start download: ${chalk.cyan(url)}: ${error}`, {
-				url: url,
-				e: error
-			});
-			writable.close();
-			rej(error);
-		});
-	});
+	await downloadUrl(url, path);
 
 	let driveFile: IDriveFile;
 	let error;